/* ================================
   Promptly3D - Modern CSS Redesign
   Zoo.dev Inspired Clean Aesthetic
   ================================ */

:root {
    /* Brand Colors from Promptly3D Logo */
    --primary-purple: #8B5CF6;
    --primary-magenta: #EC4899;
    --primary-pink: #F472B6;
    --light-pink: #FBCFE8;
    --deep-purple: #6D28D9;
    --vibrant-magenta: #DB2777;
    --accent-blue: #3B82F6;
    
    /* Background Colors */
    --bg-white: #FFFFFF;
    --bg-light: #FAFBFC;
    --bg-gray: #F6F8FA;
    --bg-dark: #0A0A0F;
    --bg-section: #FCFCFD;
    
    /* Text Colors */
    --text-primary: #1A1A2E;
    --text-secondary: #64748B;
    --text-muted: #94A3B8;
    --text-white: #FFFFFF;
    
    /* Border Colors */
    --border-light: #E5E7EB;
    --border-default: #E2E8F0;
    --border-focus: var(--primary-purple);
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-purple) 0%, var(--primary-magenta) 50%, var(--primary-pink) 100%);
    --gradient-hover: linear-gradient(135deg, var(--deep-purple) 0%, var(--vibrant-magenta) 50%, var(--primary-magenta) 100%);
    --gradient-subtle: linear-gradient(180deg, rgba(139, 92, 246, 0.05) 0%, rgba(236, 72, 153, 0.05) 100%);
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 2px 4px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Spacing */
    --container-max: 1280px;
    --section-padding: 80px;
    --header-height: 64px;
    --pre-launch-banner-height: 34px;
}

/* ================================
   Base Styles
   ================================ */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    /* scroll-behavior removed - GSAP handles scrolling */
    overflow-x: hidden; /* Prevent horizontal scrollbars */
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    -webkit-tap-highlight-color: transparent;
    -webkit-touch-callout: none;
    overflow-x: hidden; /* Redundant but safe */
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Poppins', sans-serif;
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ================================
   Container and Layout
   ================================ */

.section-container,
.header-container,
.hero-container,
.logos-container,
.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ================================
   Header
   ================================ */

.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.9);
    border-bottom: 1px solid var(--border-light);
    z-index: 1000;
    height: var(--header-height);
    transition: all var(--transition-base);
}

.main-header.scrolled {
    box-shadow: var(--shadow-sm);
}

/* Pre-launch Banner */
.pre-launch-banner {
    background: linear-gradient(90deg, #8a2be2 0%, #ec4899 100%);
    color: white;
    text-align: center;
    padding: 10px;
    font-size: 14px;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    z-index: 999;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 48px;
}

.logo-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    transition: transform var(--transition-base);
}

.logo-link:hover {
    transform: translateY(-2px);
}

.header-logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    object-fit: contain;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    gap: 32px;
}

.nav-item {
    font-weight: 500;
    color: var(--text-secondary);
    padding: 8px 0;
    position: relative;
    transition: color var(--transition-base);
}

.nav-item::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.nav-item:hover {
    color: var(--text-primary);
}

.nav-item:hover::after {
    width: 100%;
}

/* ================================
   Buttons
   ================================ */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-white);
    font-weight: 700;
    letter-spacing: 0.025em;
    box-shadow: 0 3px 12px rgba(139, 92, 246, 0.35), 0 2px 6px rgba(139, 92, 246, 0.25);
    min-height: 44px; /* Better touch targets for accessibility */
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
    font-size: 1.05rem; /* Consistent with design system */
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4), 0 2px 8px rgba(139, 92, 246, 0.3);
    background: var(--gradient-hover);
}

.btn-primary:focus {
    outline: 2px solid var(--primary-purple);
    outline-offset: 2px;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2), 0 6px 20px rgba(139, 92, 246, 0.4);
}

.btn-primary:active {
    transform: translateY(-1px) scale(1.01);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.35);
}

.btn-gradient {
    background: var(--gradient-primary);
    color: var(--text-white);
    font-weight: 700;
    letter-spacing: 0.025em;
    box-shadow: 0 3px 12px rgba(139, 92, 246, 0.35), 0 1px 4px rgba(139, 92, 246, 0.2);
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-gradient::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.6s ease;
}

.btn-gradient:hover::before {
    left: 100%;
}

.btn-gradient:hover {
    background: var(--gradient-hover);
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 25px rgba(139, 92, 246, 0.45), 0 3px 12px rgba(139, 92, 246, 0.3);
}

.btn-gradient:focus {
    outline: 2px solid var(--primary-purple);
    outline-offset: 2px;
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.2), 0 8px 25px rgba(139, 92, 246, 0.45);
}

.btn-gradient:active {
    transform: translateY(-1px) scale(1.01);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
}

.btn-gradient.loading {
    background: var(--gradient-primary);
    transform: none;
    cursor: not-allowed;
}

.btn-gradient.loading .btn-text {
    opacity: 0.8;
}

.btn-gradient.loading .loading-spinner {
    border-top-color: rgba(255, 255, 255, 0.9);
    animation: spin 1s linear infinite;
}

.btn-gradient .btn-arrow {
    transition: transform var(--transition-base), opacity var(--transition-base);
}

.btn-gradient:hover .btn-arrow {
    transform: translateX(6px);
}

.btn-gradient.loading .btn-arrow {
    opacity: 0;
    transform: translateX(-10px);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-arrow {
    stroke-width: 2;
    transition: transform var(--transition-base);
}

.btn:hover .btn-arrow {
    transform: translateX(4px);
}

.loading-spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 8px;
}

.btn.loading .btn-text {
    opacity: 0.7;
}

.btn.loading .loading-spinner {
    display: inline-block !important;
}

.btn.loading .btn-arrow {
    display: none;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ================================
   Hero Section
   ================================ */

/* Hero spacing: Header (64px) + Banner (34px) + Base spacing = total top padding */
/* Ensures hero content doesn't overlap with fixed header and banner elements */
.hero-section {
    padding-top: calc(var(--header-height) + var(--pre-launch-banner-height) + 120px);
    padding-bottom: 120px; /* Increased bottom padding for raised form */
    background: var(--bg-light);
    display: flex; /* Use flexbox for alignment */
    align-items: center;
    min-height: 100vh; /* Full viewport height for better balance */
    width: 100%;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr; /* Equal columns for better visual balance */
    gap: 60px; /* Increased gap for clearer separation */
    align-items: center; /* Center align for vertical balance */
    width: 100%;
}

.hero-content {
    max-width: 600px;
}

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    margin-bottom: 24px;
    margin-top: -40px; /* Further raised title */
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.7;
}

/* 3D Viewer */
.three-d-viewer-container {
    position: relative;
    width: 100%;
    background: var(--bg-white);
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    margin-top: 48px;
}

.three-d-canvas {
    width: 100%;
    height: 350px; /* Reduced height for better balance */
    position: relative;
    background: linear-gradient(135deg, #f5f5fb 0%, #fef5f9 100%);
}

.viewer-controls {
    position: absolute;
    bottom: 20px;
    left: 20px;
    display: flex;
    gap: 8px;
    background: rgba(255, 255, 255, 0.9);
    padding: 8px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.viewer-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg-white);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
    color: var(--text-secondary);
    touch-action: manipulation;
    -webkit-user-select: none;
    user-select: none;
}

.viewer-btn:hover,
.viewer-btn:active {
    background: var(--gradient-primary);
    color: var(--text-white);
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .viewer-btn {
        width: 44px;
        height: 44px;
        border-radius: 10px;
    }
    
    .viewer-controls {
        bottom: 16px;
        left: 16px;
        padding: 10px;
    }
    
    .hero-section {
        padding-top: calc(var(--header-height) + var(--pre-launch-banner-height) + 60px);
        /* Reduced padding for mobile */
    }
    
    .hero-title {
        margin-top: 10px;
        /* Reduced top margin to prevent cutoff */
    }
}

.viewer-info {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.info-badge {
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.info-text {
    color: var(--text-muted);
    font-size: 0.875rem;
}


/* Hero Form */
.hero-form-wrapper {
    background: var(--bg-white);
    border-radius: 20px;
    padding: 56px; /* Increased from 48px */
    box-shadow: var(--shadow-xl);
    margin-top: -20px; /* Raised form for better balance */
    max-width: 600px; /* Increased from 480px to better match hero section */
    width: 100%;
    justify-self: start;
    position: relative;
    z-index: 10;
}

.signup-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-title {
    font-size: 2.25rem; /* Increased from 2rem */
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-align: center;
    margin-bottom: 12px;
    line-height: 1.2;
    text-shadow: 0 2px 4px rgba(139, 92, 246, 0.1);
    color: var(--primary-purple);
}

.form-subtitle {
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 32px;
    font-size: 1.25rem; /* Increased from 1.125rem */
    font-weight: 500;
    line-height: 1.6;
}

.form-group {
    position: relative;
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-default);
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
    background: var(--bg-white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 100px;
}

.form-note {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: 20px;
    line-height: 1.5;
}

.success-message {
    text-align: center;
    padding: 24px;
    background: linear-gradient(135deg, #10b981, #059669);
    color: white;
    border-radius: 12px;
    font-size: 1.125rem;
    font-weight: 600;
    margin: 20px 0;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.error-message {
    text-align: center;
    padding: 16px;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    margin: 16px 0;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
}


/* ================================
   Features Section
   ================================ */

.features-section {
    padding: 40px 0;
    background: var(--bg-section);
}

/* FIXED: Initial states for clean animations */
.feature-block,
.cta-content {
    opacity: 1;
    transform: translateY(0);
}

/* FIXED: Let GSAP control these elements completely */
.step-card,
.compare-column {
    /* No initial opacity/transform - GSAP will handle */
}

.section-title {
    opacity: 1;
    transform: translateY(0);
}

/* Scroll behavior handled by GSAP - removed CSS conflicts */

/* Better performance for animations */
.feature-block,
.step-card,
.compare-column {
    will-change: opacity;
}

/* Improved transitions */
.btn {
    /* will-change removed for Chrome performance */
    backface-visibility: hidden;
    perspective: 1000px;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    text-align: center;
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.25rem;
    max-width: 600px;
    margin: 0 auto 30px;
}

.feature-block {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 40px;
}

.feature-block:last-child {
    margin-bottom: 0;
}

/* Remove reverse layout tricks to keep layout stable during simple fades */

.feature-content {
    max-width: 500px;
}

.feature-title {
    font-size: 2rem;
    margin-bottom: 20px;
}

.feature-description {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 32px;
    line-height: 1.8;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

.feature-list li::before {
    content: '✓';
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.feature-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-demo-box {
    background: var(--bg-white);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 500px;
}

.demo-prompt {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px;
    background: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 24px;
}

.prompt-icon {
    font-size: 2rem;
}

.demo-prompt p {
    flex: 1;
    color: var(--text-primary);
    font-weight: 500;
}

.demo-arrow {
    text-align: center;
    font-size: 2rem;
    color: var(--primary-purple);
    margin-bottom: 24px;
}

.mini-3d-preview {
    height: 200px;
    background: linear-gradient(135deg, #f5f5fb 0%, #fef5f9 100%);
    border-radius: 12px;
    position: relative;
    overflow: hidden;
}

.ai-processing-visual {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.processing-node {
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
}

.processing-node:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

/* ================================
   STANDARD Flip Cards (Research-Based Implementation)
   ================================ */

.flip-card {
    background: transparent;
    width: 100%;
    height: 150px;
    /* STANDARD: Container provides perspective and preserves 3D */
    perspective: 1000px;
    cursor: pointer;
    border-radius: 12px;
    position: relative;
}

.flip-card:hover {
    transform: translateY(-4px);
}

.flip-card:focus {
    outline: 3px solid var(--primary-purple);
    outline-offset: 2px;
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
    will-change: transform;
}

.flip-card.flipped .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    /* STANDARD: Hide back faces to prevent mirroring */
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8px;
    box-sizing: border-box;
}

.flip-card-front {
    background: var(--gradient-primary);
    color: var(--text-white);
    /* STANDARD: Front face starts at 0deg (no transform needed) */
}

.flip-card-front h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin: 0;
    color: var(--text-white);
    text-align: center;
    line-height: 1.3;
}

.flip-card-back {
    background: rgba(255, 255, 255, 0.98);
    color: var(--text-primary);
    /* STANDARD: Back face starts rotated 180deg away from viewer */
    transform: rotateY(180deg);
    -webkit-backdrop-filter: blur(15px);
    backdrop-filter: blur(15px);
    border: 1px solid rgba(139, 92, 246, 0.3);
}

.flip-card-back p {
    font-size: 0.75rem;
    line-height: 1.3;
    margin: 0;
    color: var(--text-primary);
    text-align: center;
    font-weight: 500;
    padding: 8px;
    overflow: hidden;
    word-wrap: break-word;
    box-sizing: border-box;
}

.flip-card:hover .flip-card-front {
    background: var(--gradient-hover);
    box-shadow: 0 12px 40px rgba(139, 92, 246, 0.3);
}

.flip-card:hover .flip-card-back {
    box-shadow: 0 12px 40px rgba(139, 92, 246, 0.2);
}

/* For users who prefer reduced motion, use simple show/hide */
@media (prefers-reduced-motion: reduce) {
    .flip-card-inner {
        transition: none;
    }
    
    .flip-card.flipped .flip-card-front {
        display: none;
    }
    
    .flip-card.flipped .flip-card-back {
        transform: none;
        display: flex;
    }
}

.flip-card-inner.loading {
    opacity: 0.7;
    pointer-events: none;
}

.flip-card:active .flip-card-inner {
    transform: scale(0.98);
}

.flip-card.flipped:active .flip-card-inner {
    transform: rotateY(180deg) scale(0.98);
}

.refinement-chat {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.chat-message {
    padding: 16px 20px;
    border-radius: 16px;
    font-size: 0.875rem;
    max-width: 80%;
}

.chat-message.user {
    background: var(--bg-light);
    align-self: flex-end;
    margin-left: auto;
}

.chat-message.ai {
    background: var(--gradient-primary);
    color: var(--text-white);
    align-self: flex-start;
}

/* ================================
   How It Works Section
   ================================ */

.how-section {
    padding: var(--section-padding) 0;
    background: var(--bg-white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
    margin-top: 80px;
    align-items: stretch; /* FIXED: Ensure cards have equal height */
}

/* SAFARI FALLBACK: Force 2D flip if 3D doesn't work */
@supports not (transform-style: preserve-3d) {
    .flip-card-inner {
        transition: none !important;
    }
    
    .flip-card.flipped .flip-card-front {
        display: none !important;
    }
    
    .flip-card.flipped .flip-card-back {
        transform: none !important;
        -webkit-transform: none !important;
        display: flex !important;
    }
    
    .flip-card-front,
    .flip-card-back {
        backface-visibility: visible !important;
        -webkit-backface-visibility: visible !important;
    }
}

/* SAFARI-SPECIFIC: Safari supports the standard pattern but needs explicit webkit prefixes */
@media screen and (-webkit-min-device-pixel-ratio: 0) {
    .flip-card-inner {
        -webkit-transform-style: preserve-3d;
        -webkit-transition: -webkit-transform 0.6s;
    }
    
    .flip-card.flipped .flip-card-inner {
        -webkit-transform: rotateY(180deg);
    }
    
    .flip-card-front,
    .flip-card-back {
        -webkit-backface-visibility: hidden;
    }
    
    .flip-card-back {
        -webkit-transform: rotateY(180deg);
    }
}

/* FIXED: Add responsive behavior for steps grid */
@media (max-width: 1024px) {
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }
}

@media (max-width: 640px) {
    .steps-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 60px;
    }
}

.step-card {
    background: var(--bg-light);
    border-radius: 20px;
    padding: 40px 30px;
    text-align: center;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
    overflow: visible; /* Prevent clipping of child elements */
    position: relative; /* FIXED: Add relative positioning for step numbers */
    min-height: 280px; /* FIXED: Ensure consistent card heights */
}

.step-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    background: var(--bg-white);
}

.step-number {
    position: absolute;
    top: -20px;
    left: 30px;
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.3;
    z-index: 1; /* FIXED: Ensure step numbers stay on top */
}

.step-icon-box {
    height: 100px; /* Adjusted for better vertical spacing */
    margin: 0 auto 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
}

.step-icon-box:hover {
    transform: translateY(-5px);
}

.step-icon {
    width: 80px; /* Increased size for better visibility */
    height: 80px; /* Increased size for better visibility */
    stroke: var(--primary-purple);
    stroke-width: 1.5;
    fill: none;
    transition: all 0.3s ease;
}

.step-icon-box:hover .step-icon {
    transform: scale(1.1);
}

.step-logo {
    width: 80px; /* Final size adjustment */
    height: 80px; /* Final size adjustment */
    object-fit: contain;
    transition: all 0.3s ease;
}

.step-icon-box:hover .step-logo {
    transform: scale(1.1);
}

.step-title {
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.step-description {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
}

/* ================================
   Comparison Section
   ================================ */

.compare-section {
    padding: 80px 0;
    background-color: var(--bg-main);
}

.compare-table {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

/* FIXED: Remove CSS conflicts with GSAP animations */
.compare-column {
    background: var(--bg-section);
    border-radius: 12px;
    padding: 32px;
    position: relative;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
}

.compare-column:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.compare-column.featured {
    background: var(--gradient-subtle);
    border: 2px solid var(--primary-purple);
    transform: scale(1.05);
}

.compare-column.featured:hover {
    transform: scale(1.08) translateY(-4px);
}

.compare-header {
    text-align: center;
    margin-bottom: 32px;
}

.compare-header h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.time-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--bg-light);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.compare-column.featured .time-badge {
    background: var(--gradient-primary);
    color: var(--text-white);
}

.compare-column:not(.featured) .time-badge {
    background: rgba(255, 59, 48, 0.1);
    color: #ff3b30;
}

.compare-column.featured .time-badge {
    background: rgba(52, 199, 89, 0.1);
    color: #34c759;
    font-weight: 700;
}

.compare-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.compare-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.compare-item::before {
    content: '✕';
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    border-radius: 50%;
    flex-shrink: 0;
}

.compare-item.no::before {
    color: #EF4444;
    background: #FEE2E2;
}

.compare-item.partial::before {
    content: '◐';
    color: #F59E0B;
    background: #FEF3C7;
}

.compare-item.yes::before {
    content: '✓';
    color: #10B981;
    background: #D1FAE5;
}

.featured-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: var(--text-white);
    padding: 8px 24px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

/* ================================
   CTA Section
   ================================ */

.cta-section {
    padding: var(--section-padding) 0;
    background: var(--bg-white);
}

.cta-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 16px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cta-subtitle {
    color: var(--text-secondary);
    font-size: 1.25rem;
    margin-bottom: 40px;
}

.cta-note {
    margin-top: 24px;
    color: var(--text-muted);
    font-size: 0.875rem;
}



/* ================================
   Footer
   ================================ */

.main-footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 80px;
    margin-bottom: 60px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.footer-logo {
    width: 40px;
    height: 40px;
    border-radius: 10px;
}

.footer-brand h4 {
    font-size: 1.5rem;
    color: var(--text-white);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 32px;
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 16px;
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
}

.social-link:hover {
    background: var(--gradient-primary);
    transform: translateY(-2px);
}

.footer-column h5 {
    color: var(--text-white);
    font-size: 1rem;
    margin-bottom: 24px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--text-white);
}

.footer-bottom {
    padding-top: 40px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

.footer-legal {
    display: flex;
    gap: 32px;
}

.footer-legal a {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

.footer-legal a:hover {
    color: var(--text-white);
}

/* ================================
   Animations
   ================================ */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-10px) rotate(5deg);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.animate-in {
    animation: fadeIn 0.6s ease-out forwards;
}

/* ================================
   Responsive Design
   ================================ */

@media (max-width: 1024px) {
    :root {
        --section-padding: 60px;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-content {
        order: 2;
    }

    .hero-form-wrapper {
        order: 3;
        margin: -40px auto 0;
        max-width: 500px;
        justify-self: center;
        transform: translateY(0);
    }
    
    .three-d-viewer-container {
        order: 1;
    }
    
    .features-section {
        padding: 30px 0;
    }
    
    .feature-block {
        grid-template-columns: 1fr;
        gap: 30px;
        margin-bottom: 30px;
    }
    
    .feature-block.reverse {
        direction: ltr;
    }
    
    .steps-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .compare-table {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 40px;
        --header-height: 60px;
    }
    
    .main-nav {
        display: none;
    }
    
    .hero-section {
        padding-top: calc(var(--header-height) + var(--pre-launch-banner-height) + 60px);
        padding-bottom: 40px;
    }
    
    .hero-container {
        gap: 40px;
    }
    
    .hero-title {
        font-size: clamp(2rem, 6vw, 2.5rem);
        margin-top: 10px;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
        margin-bottom: 30px;
    }
    
    .three-d-viewer-container {
        height: 300px;
        margin-top: 30px;
    }
    
    .three-d-canvas {
        height: 300px;
    }
    
    .hero-form-wrapper {
        padding: 30px;
        margin-top: -20px;
        max-width: 480px;
    }
    
    .features-section {
        padding: 20px 0;
    }
    
    .section-subtitle {
        margin: 0 auto 20px;
    }
    
    .feature-block {
        margin-bottom: 25px;
        gap: 25px;
    }
    
    .flip-card {
        height: 120px;
    }
    
    .flip-card-front h3 {
        font-size: 1rem;
    }
    
    .flip-card .flip-card-back p {
        font-size: 0.65rem !important; /* FIXED: Even smaller for mobile */
        line-height: 1.2 !important; /* FIXED: Tighter line height for mobile */
        max-height: 90px !important; /* FIXED: Smaller height on mobile */
        padding: 4px !important; /* FIXED: Less padding on mobile */
    }
    
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
    
    .compare-table {
        grid-template-columns: 1fr;
    }
    
    .compare-column.featured {
        transform: scale(1);
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
    
    .footer-legal {
        flex-direction: column;
        gap: 16px;
    }
}

@media (max-width: 480px) {
    :root {
        --section-padding: 30px;
    }
    
    .section-title {
        font-size: clamp(1.5rem, 8vw, 2rem);
    }
    
    .hero-section {
        padding-top: calc(var(--header-height) + var(--pre-launch-banner-height) + 30px);
        padding-bottom: 30px;
    }
    
    .hero-container {
        gap: 30px;
    }
    
    .hero-title {
        font-size: clamp(1.75rem, 8vw, 2.25rem);
        margin-top: 5px;
        margin-bottom: 16px;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 24px;
    }
    
    .three-d-viewer-container {
        height: 250px;
        margin-top: 20px;
    }
    
    .three-d-canvas {
        height: 250px;
    }
    
    .hero-form-wrapper {
        padding: 20px;
        border-radius: 16px;
        margin-top: -10px;
        max-width: 400px;
    }
    
    .features-section {
        padding: 15px 0;
    }
    
    .section-subtitle {
        margin: 0 auto 15px;
        font-size: 1.125rem;
    }
    
    .feature-block {
        margin-bottom: 20px;
        gap: 20px;
    }
    
    .flip-card {
        height: 100px;
    }
    
    .flip-card-front,
    .flip-card-back {
        padding: 15px;
    }
    
    .flip-card-front h3 {
        font-size: 0.875rem;
        line-height: 1.2;
    }
    
    .flip-card .flip-card-back p {
        font-size: 0.6rem !important; /* FIXED: Very small for very small screens */
        line-height: 1.1 !important; /* FIXED: Tight line height */
        max-height: 80px !important; /* FIXED: Even smaller height for small screens */
        padding: 3px !important; /* FIXED: Minimal padding on small screens */
    }
    
    .form-input,
    .form-select,
    .form-textarea {
        padding: 12px 16px;
        font-size: 16px;
        border-radius: 10px;
    }
    
    .btn {
        padding: 14px 20px;
        font-size: 1rem;
        border-radius: 10px;
        min-height: 48px;
    }
    
    .btn-primary,
    .btn-gradient {
        min-height: 50px;
        font-size: 1.05rem;
        letter-spacing: 0.02em;
    }
    
    .form-title {
        font-size: 1.75rem;
    }
    
    .form-subtitle {
        font-size: 1rem;
    }
    
    .feature-demo-box {
        padding: 24px;
        border-radius: 16px;
    }
    
    .step-card {
        padding: 24px 20px;
        border-radius: 16px;
    }
    
    .compare-column {
        padding: 20px;
        border-radius: 16px;
    }
    
    .header-container {
        padding: 0 16px;
    }
    
    .section-container {
        padding: 0 16px;
    }
    
    .footer-container {
        padding: 0 16px;
    }
}

/* Coming Soon Badge */
.coming-soon-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(138, 43, 226, 0.1);
    border: 2px solid #8a2be2;
    border-radius: 50px;
    padding: 12px 24px;
    margin: 20px 0;
    animation: pulse-glow 2s ease-in-out infinite;
}

.badge-icon {
    font-size: 20px;
}

.badge-text {
    font-size: 16px;
    font-weight: 600;
    color: #8a2be2;
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 0 0 rgba(138, 43, 226, 0.4);
    }
    50% {
        box-shadow: 0 0 0 10px rgba(138, 43, 226, 0);
    }
}

/* ================================
   Technical Annotations
   ================================ */

.technical-annotation {
    position: absolute;
    background: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 4px 8px;
    border-radius: 3px;
    font-size: 12px;
    font-family: 'Courier New', monospace;
    pointer-events: none;
}

.dimension-line {
    position: absolute;
    border-top: 1px solid #8a2be2;
    height: 1px;
}



/* ================================
   Interface Capabilities Section
   ================================ */

.interface-section {
  padding: 80px 0;
  background: #f8f9fa;
}

.interface-showcase {
  margin-top: 60px;
}

.interface-feature {
  display: flex;
  align-items: center;
  gap: 60px;
  margin-bottom: 80px;
  padding: 40px;
  background: white;
  border-radius: 20px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

.interface-feature.reverse {
  flex-direction: row-reverse;
}

.feature-visual {
  flex: 1;
  min-height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ui-demo, .collaboration-demo, .input-demo {
  position: relative;
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.demo-element, .user-avatar, .input-method {
  position: absolute;
  font-size: 32px;
  background: rgba(255, 255, 255, 0.2);
  padding: 10px;
  border-radius: 50%;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.gizmo { top: 20px; left: 20px; }
.menu { top: 20px; right: 20px; }
.toolbar { bottom: 20px; left: 50%; transform: translateX(-50%); }

.user-avatar:first-child { top: 30px; left: 30px; }
.user-avatar:last-child { bottom: 30px; right: 30px; }
.design-space { font-size: 48px; }

.input-method:nth-child(1) { top: 20px; left: 50%; transform: translateX(-50%); }
.input-method:nth-child(2) { bottom: 30px; left: 30px; }
.input-method:nth-child(3) { bottom: 30px; right: 30px; }

.feature-content {
  flex: 1;
}

.interface-list {
  list-style: none;
  padding: 0;
  margin-top: 20px;
}

.interface-list li {
  padding: 8px 0;
  border-left: 3px solid #8a2be2;
  padding-left: 15px;
  margin-bottom: 10px;
  background: rgba(138, 43, 226, 0.05);
}

.workflow-integration {
  margin-top: 60px;
  text-align: center;
  padding: 40px;
  background: white;
  border-radius: 15px;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.workflow-features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-top: 30px;
}

.workflow-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 10px;
}

.workflow-icon {
  font-size: 32px;
}

@media (max-width: 768px) {
  .interface-feature {
    flex-direction: column;
    gap: 30px;
    text-align: center;
  }
  
  .interface-feature.reverse {
    flex-direction: column;
  }
}

/* ================================
   Enhanced Interface Section CSS
   ================================ */

/* Professional Interface Variables */
:root {
    /* Professional Interface Colors */
    --interface-primary: #2D3748;
    --interface-secondary: #4A5568;
    --interface-accent: #667EEA;
    --interface-success: #48BB78;
    --interface-warning: #ED8936;
    --interface-error: #F56565;
    --interface-bg-dark: #1A202C;
    --interface-bg-light: #F7FAFC;
    --interface-border: #E2E8F0;
    --interface-shadow: rgba(0, 0, 0, 0.1);
    
    /* Professional Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    --glass-blur: blur(20px);
    
    /* Advanced Tab System */
    --tab-active-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --tab-shadow-active: 0 8px 25px rgba(102, 126, 234, 0.4);
    --tab-shadow-hover: 0 4px 15px rgba(102, 126, 234, 0.2);
    --tab-transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Professional 3D Viewport Colors */
    --viewport-bg: #1a1a1a;
    --gizmo-color-x: #ff4444;
    --gizmo-color-y: #44ff44;
    --gizmo-color-z: #4444ff;
    --measurement-color: #ffaa00;
    --grid-color: rgba(255, 255, 255, 0.1);
    
    /* Typography Scale */
    --font-interface-title: 2.25rem;
    --font-interface-subtitle: 1.5rem;
    --font-interface-body: 1rem;
    --font-interface-caption: 0.875rem;
    --font-interface-small: 0.75rem;
    
    /* Spacing Scale */
    --space-interface-xs: 0.5rem;
    --space-interface-sm: 1rem;
    --space-interface-md: 1.5rem;
    --space-interface-lg: 2rem;
    --space-interface-xl: 3rem;
    --space-interface-2xl: 4rem;
}

/* ================================
   Enhanced Interface Section
   ================================ */

.interface-section-enhanced {
    padding: 120px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    position: relative;
    overflow: hidden;
}

.interface-section-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="%23e2e8f0" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>') repeat;
    opacity: 0.3;
    pointer-events: none;
}

.interface-header {
    text-align: center;
    margin-bottom: 80px;
    position: relative;
    z-index: 2;
}

.feature-navigation {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-top: 40px;
    padding: 8px;
    background: var(--glass-bg);
    border-radius: 50px;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--glass-shadow);
    border: 1px solid var(--glass-border);
    position: relative;
    overflow: hidden;
}

.feature-navigation::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(45deg, transparent 30%, rgba(255,255,255,0.1) 50%, transparent 70%);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.feature-navigation:hover::before {
    transform: translateX(100%);
}

.nav-btn {
    padding: 20px 36px;
    border: 2px solid transparent;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 30px;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    white-space: nowrap;
    overflow: hidden;
    z-index: 1;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.nav-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--tab-active-gradient);
    border-radius: 25px;
    opacity: 0;
    transform: scale(0.8);
    transition: var(--tab-transition);
    z-index: -1;
}

.nav-btn:hover {
    color: var(--primary-purple);
    background: rgba(102, 126, 234, 0.15);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: 
        0 4px 16px rgba(102, 126, 234, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    transform: translateY(-3px) scale(1.02);
}

.nav-btn.active {
    color: white;
    background: var(--gradient-primary);
    border-color: transparent;
    box-shadow: 
        0 8px 24px rgba(102, 126, 234, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transform: translateY(-4px) scale(1.05);
}

.nav-btn.active::before {
    opacity: 1;
    transform: scale(1);
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 12px;
}

.tab-icon {
    font-size: 1.4rem;
    transition: transform 0.3s ease;
}

.tab-label {
    font-weight: inherit;
}

.nav-btn:hover .tab-icon {
    transform: scale(1.2) rotate(10deg);
}

.nav-btn.active .tab-icon {
    transform: scale(1.3) rotate(0deg);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.nav-btn::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--interface-accent);
    border-radius: 1px;
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-btn.active::after {
    width: 60%;
}

.interface-showcase-enhanced {
    position: relative;
    z-index: 2;
}

.interface-feature-enhanced {
    display: none;
    grid-template-columns: 1fr 400px;
    grid-template-rows: auto 1fr auto;
    grid-template-areas:
        "header sidebar"
        "viewport sidebar"
        "controls sidebar";
    gap: 40px;
    align-items: start;
    margin-bottom: 80px;
    padding: 60px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 24px;
    box-shadow: 0 16px 64px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInUp 0.6s ease-out;
    position: relative;
    overflow: hidden;
    min-height: 800px;
}

.interface-feature-enhanced::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: linear-gradient(45deg, var(--interface-accent), transparent);
    opacity: 0.1;
    border-radius: 0 24px 0 100px;
}

.interface-feature-enhanced.active {
    display: grid;
}

.feature-demo-container { 
    grid-area: viewport; 
    min-height: 500px;
}

.feature-content-enhanced { 
    grid-area: sidebar; 
    padding: 20px 0;
}

.demo-controls-panel {
    grid-area: controls;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.manipulation-workspace {
    display: grid;
    grid-template-columns: 1fr 300px;
    grid-template-rows: 1fr auto;
    grid-template-areas:
        "viewport controls"
        "metrics controls";
    gap: 20px;
    height: 100%;
}

.viewport-container { 
    grid-area: viewport; 
    position: relative;
    background: var(--viewport-bg);
    border-radius: 16px;
    overflow: hidden;
}

.precision-controls { 
    grid-area: controls;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.performance-metrics { 
    grid-area: metrics;
    display: flex;
    gap: 20px;
    padding: 16px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.transform-panel,
.constraint-panel,
.measurement-panel {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 12px;
    padding: 16px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.transform-panel h5,
.constraint-panel h5,
.measurement-panel h5 {
    margin: 0 0 12px 0;
    color: var(--interface-primary);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.input-group {
    margin-bottom: 12px;
}

.input-group label {
    display: block;
    font-size: 0.75rem;
    color: var(--interface-secondary);
    margin-bottom: 4px;
    font-weight: 500;
}

.precision-input {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--interface-border);
    border-radius: 6px;
    font-size: 0.875rem;
    font-family: 'Courier New', monospace;
    background: white;
    transition: border-color 0.3s ease;
}

.precision-input:focus {
    outline: none;
    border-color: var(--interface-accent);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.constraint-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--interface-secondary);
}

.constraint-toggle input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--interface-accent);
}

.measurement-tool {
    padding: 8px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
    font-size: 0.875rem;
    color: var(--interface-secondary);
}

.measurement-tool:last-child {
    border-bottom: none;
}

.measurement-tool strong {
    color: var(--interface-primary);
    font-family: 'Courier New', monospace;
}

.metric {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-width: 80px;
}

.metric-label {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--measurement-color);
    font-family: 'Courier New', monospace;
    text-shadow: 0 0 10px var(--measurement-color);
}

.gizmo-overlay,
.measurement-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    pointer-events: none;
    z-index: 10;
}

.measurement-overlay {
    top: auto;
    bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-items: flex-end;
}

.mode-icon {
    font-size: 1.2rem;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-demo-container {
    position: relative;
    background: var(--interface-bg-dark);
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.2);
}

.demo-canvas {
    width: 100%;
    height: 500px;
    display: block;
    background: var(--viewport-bg);
    border-radius: 16px;
    position: relative;
    overflow: hidden;
    box-shadow: inset 0 0 100px rgba(0, 0, 0, 0.3);
}

.demo-canvas::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 49px,
            var(--grid-color) 50px
        ),
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 49px,
            var(--grid-color) 50px
        );
    pointer-events: none;
    opacity: 0.3;
}

.demo-ui-overlay {
    position: absolute;
    top: 20px;
    left: 20px;
    right: 20px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    pointer-events: none;
}

.gizmo-controls {
    display: flex;
    gap: 8px;
    pointer-events: all;
}

.gizmo-btn {
    width: 48px;
    height: 48px;
    border: none;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.gizmo-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 12px;
    background: linear-gradient(45deg, rgba(255,255,255,0.1), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.gizmo-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1) translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.gizmo-btn:hover::before {
    opacity: 1;
}

.gizmo-btn.active {
    background: var(--interface-accent);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.6);
    transform: scale(1.05) translateY(-1px);
}

.gizmo-btn.active .axis-indicator {
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.axis-indicator {
    width: 20px;
    height: 20px;
    border-radius: 2px;
    position: relative;
}

.axis-indicator.x-axis {
    background: linear-gradient(45deg, #ff4757, #ff3742);
}

.axis-indicator.y-axis {
    background: linear-gradient(45deg, #2ed573, #20bf6b);
}

.axis-indicator.z-axis {
    background: linear-gradient(45deg, #3742fa, #2f3542);
}

.measurement-display {
    background: rgba(0, 0, 0, 0.9);
    padding: 12px 16px;
    border-radius: 10px;
    font-family: 'Courier New', monospace;
    font-size: 0.875rem;
    color: var(--measurement-color);
    pointer-events: all;
    border: 1px solid rgba(255, 170, 0, 0.3);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: relative;
}

.measurement-display::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--measurement-color), transparent);
    opacity: 0.6;
}

.measurement-label {
    font-weight: 600;
    margin-right: 8px;
    opacity: 0.8;
}

.measurement-value {
    font-weight: 700;
    text-shadow: 0 0 10px var(--measurement-color);
}

.demo-instructions {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.8);
    padding: 8px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    color: white;
    white-space: nowrap;
}

.collaboration-workspace {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: 20px;
    height: 600px;
}

.shared-viewport {
    position: relative;
    background: var(--viewport-bg);
    border-radius: 16px;
    overflow: hidden;
}

.collaboration-sidebar {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.user-presence-overlay {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
}

.user-presence {
    display: flex;
    gap: 12px;
}

.user-status {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid white;
}

.user-status.online {
    background: #48bb78;
    box-shadow: 0 0 8px rgba(72, 187, 120, 0.6);
}

.user-status.away {
    background: #ed8936;
    box-shadow: 0 0 8px rgba(237, 137, 54, 0.6);
}

.spatial-comments {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 5;
}

.comment-marker {
    position: absolute;
    width: 32px;
    height: 32px;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    pointer-events: all;
    transition: all 0.3s ease;
    animation: commentPulse 2s infinite ease-in-out;
}

.comment-marker:hover {
    transform: scale(1.2);
    background: white;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.comment-marker:hover .comment-tooltip {
    opacity: 1;
    transform: translateY(-10px);
    pointer-events: all;
}

.comment-icon {
    font-size: 1rem;
}

.comment-tooltip {
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: white;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    transition: all 0.3s ease;
    pointer-events: none;
    z-index: 20;
}

@keyframes commentPulse {
    0%, 100% { 
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.4);
    }
    50% { 
        box-shadow: 0 0 0 8px rgba(102, 126, 234, 0);
    }
}

.user-list h5,
.chat-panel h5,
.version-control h5 {
    margin: 0 0 16px 0;
    color: var(--interface-primary);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.user-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    transition: background 0.3s ease;
}

.user-item:hover {
    background: rgba(102, 126, 234, 0.1);
}

.user-avatar-small {
    width: 32px;
    height: 32px;
    background: var(--interface-accent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

.user-info {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.user-name {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--interface-primary);
}

.user-role {
    font-size: 0.75rem;
    color: var(--interface-secondary);
}

.user-permissions {
    padding: 4px 8px;
    background: rgba(72, 187, 120, 0.1);
    color: #2d7748;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.chat-messages {
    max-height: 150px;
    overflow-y: auto;
    margin-bottom: 12px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.chat-message {
    padding: 8px 12px;
    border-radius: 8px;
    background: rgba(102, 126, 234, 0.1);
    font-size: 0.875rem;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.chat-message.active {
    background: rgba(72, 187, 120, 0.1);
    border-left: 3px solid #48bb78;
}

.message-author {
    font-weight: 600;
    color: var(--interface-primary);
}

.message-text {
    color: var(--interface-secondary);
}

.message-time {
    font-size: 0.75rem;
    color: var(--interface-secondary);
    opacity: 0.7;
}

.chat-input {
    display: flex;
    gap: 8px;
}

.chat-input input {
    flex: 1;
    padding: 8px 12px;
    border: 1px solid var(--interface-border);
    border-radius: 6px;
    font-size: 0.875rem;
    background: white;
}

.send-btn {
    padding: 8px 12px;
    background: var(--interface-accent);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.send-btn:hover {
    background: #5a67d8;
}

.version-timeline {
    position: relative;
}

.version-branch {
    position: relative;
    padding-left: 20px;
}

.version-branch::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--interface-border);
}

.version-commit {
    position: relative;
    padding: 12px 0;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.version-commit::before {
    content: '';
    position: absolute;
    left: -16px;
    top: 16px;
    width: 8px;
    height: 8px;
    background: var(--interface-border);
    border-radius: 50%;
}

.version-commit.current::before {
    background: var(--interface-accent);
    box-shadow: 0 0 8px rgba(102, 126, 234, 0.5);
}

.commit-hash {
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    color: var(--interface-accent);
    font-weight: 600;
    margin-bottom: 4px;
}

.commit-message {
    font-size: 0.875rem;
    color: var(--interface-primary);
    margin-bottom: 4px;
}

.commit-author {
    font-size: 0.75rem;
    color: var(--interface-secondary);
}

.multimodal-input-hub {
    display: grid;
    grid-template-rows: auto 1fr auto;
    gap: 20px;
    height: 100%;
}

.input-method-selector {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
    background: var(--glass-bg);
    padding: 8px;
    border-radius: 16px;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
}

.method-tab {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 16px;
    background: transparent;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: var(--tab-transition);
    position: relative;
}

.method-tab:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

.method-tab.active {
    background: var(--tab-active-gradient);
    color: white;
    box-shadow: var(--tab-shadow-active);
}

.tab-status {
    font-size: 0.75rem;
    opacity: 0.8;
    font-weight: 500;
}

.input-workspace {
    position: relative;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.input-interface {
    display: none;
    height: 100%;
}

.input-interface.active {
    display: grid;
}

.voice-interface {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.voice-controls {
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

.voice-btn {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: var(--tab-active-gradient);
    border: none;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.voice-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 35px rgba(102, 126, 234, 0.6);
}

.voice-icon {
    font-size: 2rem;
}

.voice-status {
    font-size: 0.875rem;
    font-weight: 600;
}

.quality-bars {
    display: flex;
    gap: 4px;
    align-items: end;
}

.quality-bar {
    width: 8px;
    height: 20px;
    background: var(--interface-border);
    border-radius: 4px;
    transition: background 0.3s ease;
}

.quality-bar.active {
    background: var(--interface-success);
}

.voice-visualization {
    position: relative;
    background: var(--viewport-bg);
    border-radius: 12px;
    overflow: hidden;
}

.waveform-canvas {
    width: 100%;
    height: 120px;
    display: block;
}

.freq-bars {
    display: flex;
    gap: 4px;
    align-items: end;
}

.freq-bar {
    width: 12px;
    background: var(--interface-accent);
    border-radius: 2px;
    min-height: 8px;
    transition: height 0.3s ease;
}

.parameter-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.param-tag {
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.param-tag.load { background: rgba(239, 68, 68, 0.1); color: #dc2626; }
.param-tag.fastener { background: rgba(59, 130, 246, 0.1); color: #2563eb; }
.param-tag.dimension { background: rgba(16, 185, 129, 0.1); color: #059669; }
.param-tag.thickness { background: rgba(245, 158, 11, 0.1); color: #d97706; }
.param-tag.material { background: rgba(139, 92, 246, 0.1); color: #7c3aed; }

.sketch-interface {
    grid-template-columns: 1fr 300px;
    gap: 20px;
}

.sketch-canvas {
    width: 100%;
    height: 300px;
    border: 2px dashed var(--interface-border);
    border-radius: 8px;
    background: white;
    cursor: crosshair;
}

.sketch-tools {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tool-group h6 {
    margin: 0 0 8px 0;
    font-size: 0.75rem;
    color: var(--interface-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sketch-tool,
.constraint-tool,
.action-btn {
    padding: 8px;
    border: 1px solid var(--interface-border);
    background: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.sketch-tool:hover,
.constraint-tool:hover,
.action-btn:hover {
    background: var(--interface-bg-light);
    border-color: var(--interface-accent);
}

.sketch-tool.active {
    background: var(--interface-accent);
    color: white;
    border-color: var(--interface-accent);
}

.upload-area {
    border: 2px dashed var(--interface-border);
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    background: rgba(102, 126, 234, 0.05);
    transition: all 0.3s ease;
}

.upload-area:hover {
    border-color: var(--interface-accent);
    background: rgba(102, 126, 234, 0.1);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.upload-btn {
    padding: 12px 24px;
    background: var(--interface-accent);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    margin-top: 16px;
    transition: background 0.3s ease;
}

.upload-btn:hover {
    background: #5a67d8;
}

.element-tag {
    display: inline-block;
    padding: 4px 8px;
    background: rgba(102, 126, 234, 0.1);
    color: var(--interface-primary);
    border-radius: 6px;
    font-size: 0.75rem;
    margin: 2px;
}

.ai-processing-panel {
    background: var(--viewport-bg);
    border-radius: 12px;
    padding: 16px;
    color: white;
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--interface-success);
    border-radius: 50%;
    animation: statusPulse 2s infinite ease-in-out;
}

@keyframes statusPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.processing-metrics {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.metric {
    font-size: 0.75rem;
    opacity: 0.8;
}

.suggestion-item {
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 6px;
    font-size: 0.875rem;
    margin-bottom: 8px;
}

.workflow-integration-hub {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto 1fr;
    grid-template-areas:
        "process integration"
        "dashboard dashboard";
    gap: 20px;
    height: 100%;
}

.process-diagram { 
    grid-area: process;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.integration-panel { 
    grid-area: integration;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.quality-dashboard { 
    grid-area: dashboard;
    background: var(--viewport-bg);
    border-radius: 16px;
    padding: 20px;
    color: white;
}

.workflow-stage {
    background: white;
    border-radius: 12px;
    padding: 20px;
    text-align: center;
    margin-bottom: 16px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
}

.workflow-stage:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.workflow-stage.active {
    border: 2px solid var(--interface-accent);
    background: rgba(102, 126, 234, 0.05);
}

.stage-status {
    position: absolute;
    top: 8px;
    right: 8px;
    padding: 4px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
}

.stage-status.online { background: rgba(72, 187, 120, 0.1); color: #2d7748; }
.stage-status.processing { background: rgba(245, 158, 11, 0.1); color: #d97706; }
.stage-status.pending { background: rgba(156, 163, 175, 0.1); color: #6b7280; }

.connection-grid {
    display: grid;
    gap: 12px;
    margin-top: 16px;
}

.connection-item {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 12px;
    border-radius: 8px;
    background: rgba(102, 126, 234, 0.05);
    transition: background 0.3s ease;
}

.connection-item:hover {
    background: rgba(102, 126, 234, 0.1);
}

.connection-status {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #48bb78;
    animation: connectionPulse 2s infinite ease-in-out;
}

.connection-item.warning .connection-status {
    background: #ed8936;
}

@keyframes connectionPulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.system-name {
    font-weight: 600;
    color: var(--interface-primary);
    font-size: 0.875rem;
}

.connection-type {
    font-size: 0.75rem;
    color: var(--interface-secondary);
}

.metric-value {
    font-family: 'Courier New', monospace;
    font-weight: 700;
    color: var(--interface-primary);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin-bottom: 24px;
}

.metric-card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 16px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.metric-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.metric-title {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.7);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-trend {
    font-size: 0.75rem;
    font-weight: 600;
}

.metric-trend.up { color: #48bb78; }
.metric-trend.down { color: #f56565; }

.metric-card .metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin-bottom: 4px;
}

.metric-subtitle {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
}

.alert-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.alert-item {
    display: flex;
    gap: 12px;
    padding: 12px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
}

.alert-item.info { border-left: 3px solid #3b82f6; }
.alert-item.warning { border-left: 3px solid #f59e0b; }
.alert-item.success { border-left: 3px solid #10b981; }

.alert-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.alert-title {
    font-size: 0.875rem;
    color: white;
}

.alert-time {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.6);
}

.workspace-3d {
    position: relative;
    background: var(--interface-bg-dark);
}

.user-presence {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 12px;
}

.user-avatar {
    position: relative;
    width: 40px;
    height: 40px;
    background: var(--interface-bg-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--interface-primary);
    animation: userPulse 2s infinite ease-in-out;
}

.user-avatar.active .avatar-ring {
    position: absolute;
    inset: -4px;
    border: 2px solid var(--interface-accent);
    border-radius: 50%;
    animation: ringPulse 2s infinite ease-in-out;
}

@keyframes userPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes ringPulse {
    0%, 100% { 
        transform: scale(1);
        opacity: 1;
    }
    50% { 
        transform: scale(1.2);
        opacity: 0.7;
    }
}

.user-cursor {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--cursor-color);
    border-radius: 50% 0 50% 50%;
    top: -8px;
    right: -8px;
    animation: cursorMove 3s infinite ease-in-out;
}

@keyframes cursorMove {
    0%, 100% { transform: translate(0, 0); }
    33% { transform: translate(10px, -5px); }
    66% { transform: translate(-5px, 8px); }
}

.collaboration-timeline {
    background: rgba(255, 255, 255, 0.95);
    padding: 20px;
    border-top: 1px solid rgba(0, 0, 0, 0.1);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.timeline-play {
    background: var(--interface-accent);
    border: none;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.timeline-play:hover {
    background: #5a67d8;
}

.timeline-events {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.timeline-event {
    display: flex;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.875rem;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.timeline-event.completed {
    background: rgba(72, 187, 120, 0.1);
    border-left-color: #48bb78;
}

.timeline-event.active {
    background: rgba(102, 126, 234, 0.1);
    border-left-color: #667eea;
    animation: eventPulse 2s infinite ease-in-out;
}

@keyframes eventPulse {
    0%, 100% { background: rgba(102, 126, 234, 0.1); }
    50% { background: rgba(102, 126, 234, 0.2); }
}

.event-user {
    font-weight: 600;
    color: var(--interface-primary);
    min-width: 30px;
}

.event-action {
    color: var(--interface-secondary);
}

.input-methods-demo {
    background: var(--interface-bg-light);
    border-radius: 16px;
    overflow: hidden;
}

.input-method-tabs {
    display: flex;
    background: var(--interface-bg-dark);
}

.input-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px;
    background: transparent;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.input-tab:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.input-tab.active {
    color: white;
    background: rgba(102, 126, 234, 0.2);
}

.input-tab.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--interface-accent);
}

.tab-icon {
    font-size: 1.5rem;
}

.tab-label {
    font-size: 0.875rem;
    font-weight: 600;
}

.input-demo-area {
    position: relative;
    height: 350px;
}

.input-demo {
    position: absolute;
    inset: 0;
    padding: 30px;
    display: none;
    align-items: center;
    justify-content: center;
}

.input-demo.active {
    display: flex;
}

.voice-visualizer {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    width: 100%;
}

.waveform-canvas {
    width: 300px;
    height: 100px;
    background: var(--interface-bg-dark);
    border-radius: 8px;
}

.voice-text-display {
    text-align: center;
    max-width: 400px;
}

.voice-input {
    background: rgba(102, 126, 234, 0.1);
    padding: 15px 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-style: italic;
    color: var(--interface-accent);
}

.processing-indicator {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 20px 0;
}

.processing-dot {
    width: 8px;
    height: 8px;
    background: var(--interface-accent);
    border-radius: 50%;
    animation: processingPulse 1.5s infinite ease-in-out;
}

.processing-dot:nth-child(2) {
    animation-delay: 0.5s;
}

.processing-dot:nth-child(3) {
    animation-delay: 1s;
}

@keyframes processingPulse {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.5); opacity: 1; }
}

.voice-output {
    background: rgba(72, 187, 120, 0.1);
    padding: 15px 20px;
    border-radius: 10px;
    color: var(--interface-success);
    border-left: 3px solid #48bb78;
}

.sketch-to-3d {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    align-items: center;
    width: 100%;
}

.sketch-input {
    position: relative;
}

.sketch-area {
    width: 200px;
    height: 150px;
    background: white;
    border: 2px dashed var(--interface-border);
    border-radius: 8px;
    cursor: crosshair;
}

.sketch-tools {
    display: flex;
    gap: 8px;
    margin-top: 10px;
    justify-content: center;
}

.sketch-tool {
    width: 32px;
    height: 32px;
    border: 1px solid var(--interface-border);
    background: white;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.sketch-tool:hover {
    background: var(--interface-bg-light);
}

.sketch-tool.active {
    background: var(--interface-accent);
    color: white;
    border-color: var(--interface-accent);
}

.transformation-arrow {
    font-size: 2rem;
    color: var(--interface-accent);
    animation: arrowPulse 2s infinite ease-in-out;
}

@keyframes arrowPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

.result-canvas {
    width: 200px;
    height: 150px;
    background: var(--interface-bg-dark);
    border-radius: 8px;
}

.technical-import {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    width: 100%;
}

.upload-preview {
    background: white;
    padding: 20px;
    border-radius: 12px;
    border: 2px solid var(--interface-border);
}

.technical-drawing {
    width: 100%;
    height: auto;
}

.parameter-extraction {
    background: rgba(102, 126, 234, 0.05);
    padding: 20px;
    border-radius: 12px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.parameter-extraction h5 {
    margin-bottom: 15px;
    color: var(--interface-primary);
}

.parameter-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.parameter-list li {
    padding: 8px 12px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 6px;
    font-size: 0.875rem;
    color: var(--interface-secondary);
}

.workflow-integration-demo {
    padding: 40px;
    background: var(--interface-bg-light);
}

.workflow-diagram {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 20px;
    align-items: center;
    margin-bottom: 50px;
}

.workflow-stage {
    text-align: center;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.workflow-stage:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.stage-icon {
    font-size: 2rem;
    margin-bottom: 10px;
}

.workflow-stage h5 {
    margin-bottom: 5px;
    color: var(--interface-primary);
}

.workflow-stage p {
    font-size: 0.875rem;
    color: var(--interface-secondary);
    margin: 0;
}

.workflow-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.connector-line {
    width: 40px;
    height: 2px;
    background: var(--interface-border);
    position: relative;
    transition: all 0.3s ease;
}

.workflow-connector.active .connector-line {
    background: var(--interface-accent);
    animation: dataFlow 2s infinite ease-in-out;
}

@keyframes dataFlow {
    0% { transform: scaleX(1); }
    50% { transform: scaleX(1.2); }
    100% { transform: scaleX(1); }
}

.data-flow {
    font-size: 0.75rem;
    color: var(--interface-secondary);
    margin-top: 8px;
    padding: 4px 8px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
}

.integration-partners h5 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--interface-primary);
}

.partner-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
}

.partner-card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.partner-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}

.partner-logo {
    font-size: 2rem;
    margin-bottom: 10px;
}

.partner-card h6 {
    margin-bottom: 10px;
    color: var(--interface-primary);
}

.partner-card p {
    font-size: 0.875rem;
    color: var(--interface-secondary);
    margin: 0;
}

.feature-content-enhanced {
    padding: 20px 0;
}

.feature-title {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--interface-primary);
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature-description {
    font-size: 1.125rem;
    line-height: 1.7;
    color: var(--interface-secondary);
    margin-bottom: 40px;
}

.feature-specifications {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.spec-group h4 {
    color: var(--interface-primary);
    margin-bottom: 20px;
    font-size: 1.125rem;
    border-bottom: 2px solid var(--interface-accent);
    padding-bottom: 8px;
}

.spec-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.spec-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    background: rgba(102, 126, 234, 0.05);
    border-radius: 8px;
    transition: all 0.3s ease;
    font-size: 0.875rem;
    color: var(--interface-secondary);
}

.spec-list li:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateX(4px);
}

.spec-icon {
    font-size: 1.25rem;
    flex-shrink: 0;
}

@media (max-width: 1200px) {
    .interface-feature-enhanced {
        grid-template-columns: 1fr;
        gap: 50px;
    }
    
    .feature-specifications {
        grid-template-columns: 1fr;
        gap: 30px;
    }
    
    .workflow-diagram {
        grid-template-columns: repeat(4, 1fr);
        grid-template-rows: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .interface-section-enhanced {
        padding: 80px 0;
    }
    
    .interface-feature-enhanced {
        padding: 40px 20px;
        margin-bottom: 40px;
        grid-template-columns: 1fr;
        grid-template-areas:
            "header"
            "sidebar"
            "viewport"
            "controls";
        gap: 25px;
        min-height: auto;
    }
    
    .feature-navigation {
        grid-template-columns: repeat(2, 1fr);
        gap: 8px;
        padding: 6px;
        margin-top: 30px;
    }
    
    .nav-btn {
        padding: 12px 16px;
        font-size: 0.8rem;
        border-radius: 20px;
    }
    
    .feature-content-enhanced {
        order: -1;
    }
    
    .feature-demo-container {
        min-height: 300px;
    }
    
    .demo-canvas {
        height: 280px;
    }
    
    .demo-ui-overlay {
        flex-direction: column;
        gap: 10px;
    }
    
    .gizmo-controls {
        justify-content: center;
    }
    
    .manipulation-workspace {
        grid-template-columns: 1fr;
        grid-template-areas:
            "viewport"
            "controls"
            "metrics";
        gap: 20px;
    }
    
    .precision-controls {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .transform-panel,
    .constraint-panel,
    .measurement-panel {
        flex: 1;
        min-width: 150px;
        padding: 12px;
    }
    
    .performance-metrics {
        flex-direction: column;
        gap: 10px;
        padding: 12px;
    }
    
    .metric {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        min-width: auto;
    }
    
    .collaboration-workspace {
        grid-template-columns: 1fr;
        grid-template-areas:
            "viewport"
            "timeline"
            "presence"
            "version";
        gap: 20px;
    }
    
    .timeline-container {
        height: 200px;
    }
    
    .presence-panel {
        flex-direction: column;
        gap: 15px;
    }
    
    .user-avatar {
        width: 40px;
        height: 40px;
    }
    
    .user-info h6 {
        font-size: 0.875rem;
    }
    
    .user-status {
        font-size: 0.75rem;
    }
    
    .input-method-tabs {
        flex-direction: column;
        gap: 8px;
    }
    
    .input-tab {
        padding: 12px 16px;
        font-size: 0.875rem;
    }
    
    .voice-interface {
        flex-direction: column;
        gap: 20px;
    }
    
    .voice-controls {
        flex-direction: row;
        justify-content: center;
        gap: 15px;
    }
    
    .sketch-to-3d {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        gap: 20px;
        text-align: center;
    }
    
    .sketch-workspace {
        flex-direction: column;
        gap: 20px;
    }
    
    .sketch-canvas {
        height: 250px;
    }
    
    .sketch-tools {
        flex-direction: row;
        justify-content: center;
        flex-wrap: wrap;
        gap: 15px;
    }
    
    .tool-group {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 8px;
        min-width: 80px;
    }
    
    .upload-area {
        height: 200px;
        padding: 20px;
    }
    
    .technical-import {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .workflow-integration-hub {
        grid-template-columns: 1fr;
        grid-template-areas:
            "process"
            "integration"
            "dashboard";
        gap: 20px;
    }
    
    .workflow-diagram {
        grid-template-columns: 1fr;
        gap: 15px;
        text-align: center;
    }
    
    .workflow-stage {
        padding: 20px 15px;
    }
    
    .workflow-connector {
        transform: rotate(90deg);
        margin: 10px 0;
    }
    
    .system-connections {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .connection-item {
        padding: 15px;
    }
    
    .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }
    
    .partner-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .feature-navigation {
        grid-template-columns: 1fr;
        gap: 6px;
        padding: 4px;
    }
    
    .nav-btn {
        padding: 10px 12px;
        font-size: 0.75rem;
        text-align: center;
    }
    
    .interface-feature-enhanced {
        padding: 20px 15px;
        gap: 20px;
        margin-bottom: 30px;
    }
    
    .feature-demo-container {
        min-height: 250px;
    }
    
    .demo-canvas {
        height: 220px;
    }
    
    .precision-controls {
        flex-direction: column;
        gap: 12px;
    }
    
    .transform-panel,
    .constraint-panel,
    .measurement-panel {
        min-width: auto;
        padding: 10px;
    }
    
    .performance-metrics {
        padding: 10px;
        gap: 8px;
    }
    
    .metric-value {
        font-size: 1rem;
    }
    
    .voice-controls {
        flex-direction: column;
        gap: 10px;
    }
    
    .voice-btn {
        width: 80px;
        height: 80px;
    }
    
    .tool-group {
        min-width: 60px;
        gap: 6px;
    }
    
    .sketch-tool,
    .constraint-tool,
    .action-btn {
        width: 36px;
        height: 36px;
        font-size: 1rem;
    }
    
    .user-item {
        flex-direction: column;
        text-align: center;
        gap: 5px;
    }
    
    .user-avatar-small {
        width: 30px;
        height: 30px;
        font-size: 0.75rem;
    }
    
    .chat-message {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
    }
    
    .message-time {
        font-size: 0.7rem;
    }
    
    .upload-area {
        height: 150px;
        padding: 15px;
    }
    
    .upload-icon {
        font-size: 2rem;
    }
    
    .connection-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .connection-item {
        padding: 12px;
    }
    
    .connection-metrics {
        flex-direction: column;
        align-items: flex-end;
        gap: 2px;
    }
    
    .metrics-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
    
    .metric-card {
        padding: 15px;
        text-align: center;
    }
    
    .metric-card h4 {
        font-size: 1.5rem;
    }
    
    .input-method-tabs {
        flex-direction: column;
    }
    
    .collaboration-workspace {
        height: auto;
        grid-template-rows: 300px auto;
    }
    
    .api-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
    
    .flow-visualization {
        flex-direction: column;
        gap: 10px;
    }
    
    .flow-arrow {
        transform: rotate(90deg);
        margin: 5px 0;
    }
    
    .alert-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
        padding: 10px;
    }
}

.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    z-index: 1000;
    padding: 8px 16px;
    background: var(--text-primary);
    color: var(--bg-white);
    text-decoration: none;
    border-radius: 4px;
    font-weight: 600;
    transition: top 0.3s ease;
}

.skip-link:focus {
    top: 6px;
}

*:focus {
    outline: none;
}

.nav-btn:focus,
.btn:focus,
button:focus,
input:focus,
textarea:focus,
select:focus,
.gizmo-btn:focus,
.method-tab:focus,
.sketch-tool:focus,
.constraint-tool:focus,
.action-btn:focus {
    outline: 3px solid var(--accent-blue);
    outline-offset: 2px;
    box-shadow: 0 0 0 1px var(--bg-white), 0 0 0 4px var(--accent-blue);
}

@media (prefers-contrast: high) {
    :root {
        --text-primary: #000000;
        --text-secondary: #000000;
        --bg-white: #ffffff;
        --border-default: #000000;
        --primary-purple: #0000ff;
    }
    
    .nav-btn.active,
    .btn-gradient {
        background: #000000 !important;
        color: #ffffff !important;
        border: 2px solid #000000 !important;
    }
    
    .interface-feature-enhanced {
        border: 2px solid #000000 !important;
    }
}

.interface-feature-enhanced[aria-hidden="true"] {
    display: none !important;
}

.interface-feature-enhanced[aria-hidden="false"] {
    display: grid !important;
}

.feature-navigation::after {
    content: "Use arrow keys to navigate tabs, Enter or Space to activate";
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    color: var(--text-muted);
    white-space: nowrap;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.feature-navigation:focus-within::after {
    opacity: 1;
}

.measurement-value,
.metric-value {
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.7);
}

@media (hover: hover) {
    .nav-btn:hover,
    .btn:hover,
    .gizmo-btn:hover {
        transform: translateY(-2px);
    }
}

@media (hover: none) {
    .nav-btn:hover,
    .btn:hover,
    .gizmo-btn:hover {
        transform: none;
    }
}

.nav-btn,
.interface-feature-enhanced,
.demo-canvas,
.gizmo-btn,
.method-tab,
.metric-value {
    /* will-change removed for Chrome performance */
    transform: translateZ(0);
    backface-visibility: hidden;
}

.flip-card-inner,
.processing-steps .step,
.animation-element {
    contain: layout style paint;
}

.interface-feature-enhanced {
    content-visibility: auto;
    contain-intrinsic-size: 800px;
}

.demo-canvas {
    content-visibility: auto;
    contain-intrinsic-size: 500px 400px;
}

@media (min-width: 768px) {
    .nav-btn,
    .btn,
    .gizmo-btn {
        transition: transform 150ms cubic-bezier(0.4, 0, 0.2, 1);
    }
}

@media (max-width: 767px) {
    .nav-btn,
    .btn,
    .gizmo-btn {
        transition: none;
    }
    
    .animate-fade-in,
    .animate-slide-up,
    .animate-scale-in {
        animation: none;
    }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease-out;
}

.animate-slide-up {
    animation: slideUp 0.6s ease-out;
}

.animate-scale-in {
    animation: scaleIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.btn[href="#get-started"],
.btn[href="#hero-form"] {
    background: var(--gradient-primary);
    color: var(--text-white);
    font-weight: 700;
    letter-spacing: 0.025em;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
    transition: opacity var(--transition-base), box-shadow var(--transition-base);
}

.btn[href="#get-started"]:hover,
.btn[href="#hero-form"]:hover {
    background: var(--gradient-hover);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

@media (prefers-contrast: high) {
    .form-title {
        background: none;
        -webkit-background-clip: unset;
        -webkit-text-fill-color: unset;
        background-clip: unset;
        color: var(--text-primary);
        text-shadow: none;
    }
    
    .btn-primary,
    .btn-gradient {
        background: var(--text-primary);
        border: 2px solid var(--text-primary);
    }
}

@supports not (background-clip: text) {
    .form-title,
    .hero-title,
    .section-title,
    .cta-title,
    .logo-text {
        background: none !important;
        -webkit-background-clip: unset !important;
        -webkit-text-fill-color: unset !important;
        background-clip: unset !important;
        color: var(--primary-purple) !important;
    }
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

.nav-btn:focus,
.gizmo-btn:focus,
.input-tab:focus,
.sketch-tool:focus,
.timeline-play:focus,
.btn:focus,
.form-input:focus,
.form-select:focus,
.form-textarea:focus,
.flip-card:focus {
    outline: 2px solid var(--interface-accent);
    outline-offset: 2px;
}

.flip-card:focus-within {
    transform: translateY(-2px);
}

.btn-primary:focus-visible,
.btn-gradient:focus-visible {
    outline: 3px solid var(--primary-purple);
    outline-offset: 3px;
    box-shadow: 0 0 0 6px rgba(139, 92, 246, 0.15);
}

.form-input:focus-visible,
.form-select:focus-visible,
.form-textarea:focus-visible {
    outline: 2px solid var(--primary-purple);
    outline-offset: 2px;
    border-color: var(--primary-purple);
    box-shadow: 0 0 0 4px rgba(139, 92, 246, 0.1);
}

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-white);
    border-radius: 20px;
    padding: 40px;
    margin: 20px;
    max-width: 500px;
    width: 100%;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-secondary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.modal-close:hover {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.modal-header {
    text-align: center;
    margin-bottom: 30px;
}

.modal-icon {
    font-size: 1.5rem;
    line-height: 1;
    margin-right: 12px;
    color: var(--primary-purple);
}

.modal-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    background: linear-gradient(135deg, var(--primary-purple), var(--primary-magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.modal-body {
    text-align: center;
}

.modal-message {
    font-size: 18px;
    color: var(--text-primary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.modal-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.5;
}

.modal-cta {
    margin: 0 auto;
    min-width: 200px;
}

.coming-soon-link {
    position: relative;
    cursor: pointer;
}

.coming-soon-link::after {
    content: "→";
    font-size: 12px;
    margin-left: 6px;
    opacity: 0.7;
}

.coming-soon-link:hover::after {
    opacity: 1;
}

@media (max-width: 768px) {
    .modal-content {
        padding: 30px 20px;
        margin: 10px;
    }

    .modal-title {
        font-size: 24px;
    }

    .modal-message {
        font-size: 16px;
    }

    .modal-subtitle {
        font-size: 14px;
    }
}

.processing-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.3s ease-out;
}

.processing-content {
    background: #ffffff;
    border-radius: 12px;
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    text-align: center;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s ease-out;
}

.processing-header h3 {
    margin: 0 0 0.5rem 0;
    color: #2c3e50;
    font-size: 1.5rem;
    font-weight: 700;
}

.processing-header p {
    margin: 0 0 1.5rem 0;
    color: #666;
    font-style: italic;
    font-size: 0.95rem;
}

#processing-bracket-container {
    width: 300px;
    height: 200px;
    margin: 0 auto 1.5rem auto;
    border: 2px solid #e1e8ed;
    border-radius: 8px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    position: relative;
    overflow: hidden;
}

#processing-bracket-container canvas {
    border-radius: 6px;
}

.processing-steps {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    align-items: flex-start;
}

.processing-steps .step {
    padding: 0.5rem 1rem;
    background: #f8f9fa;
    border-radius: 20px;
    color: #666;
    font-size: 0.9rem;
    opacity: 0.5;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.processing-steps .step::before {
    content: '';
    position: absolute;
    left: -100%;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.4), transparent);
    transition: left 0.5s;
}

.processing-steps .step.active {
    background: var(--gradient-primary);
    color: white;
    opacity: 1;
    transform: translateX(5px);
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.processing-steps .step.active::before {
    left: 100%;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    #processing-bracket-container {
        width: 250px;
        height: 150px;
    }
    
    .processing-content {
        padding: 1.5rem;
        max-width: 350px;
    }
    
    .processing-header h3 {
        font-size: 1.25rem;
    }
    
    .processing-header p {
        font-size: 0.85rem;
    }
    
    .processing-steps .step {
        font-size: 0.8rem;
        padding: 0.4rem 0.8rem;
    }
}

@media (max-width: 480px) {
    #processing-bracket-container {
        width: 220px;
        height: 130px;
    }
    
    .processing-content {
        padding: 1.25rem;
        margin: 1rem;
    }
}

.ai-generation-showcase {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 24px;
    align-items: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(159, 122, 234, 0.05) 100%);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.generation-input,
.generation-output {
    background: white;
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    height: 100%;
}

.input-header,
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.ai-badge,
.output-badge {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--primary-purple);
}

.processing-status {
    font-size: 0.75rem;
    color: var(--success-green);
    animation: pulse 2s infinite;
}

.quality-score {
    font-size: 0.75rem;
    color: var(--success-green);
    font-weight: 600;
}

.user-prompt {
    font-style: italic;
    color: var(--text-secondary);
    margin-bottom: 16px;
    padding: 12px;
    background: var(--bg-light);
    border-radius: 8px;
    border-left: 3px solid var(--primary-purple);
}

.extracted-params {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.param-tag {
    background: var(--gradient-primary);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.generation-process {
    display: flex;
    align-items: center;
    justify-content: center;
}

.process-flow {
    display: flex;
    align-items: center;
    gap: 12px;
}

.flow-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.flow-step.active {
    opacity: 1;
}

.flow-step-icon {
    width: 48px;
    height: 48px;
    background: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.flow-step span {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.flow-connector {
    width: 40px;
    height: 2px;
    background: #e0e0e0;
    position: relative;
    overflow: hidden;
}

.flow-connector.active::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    animation: flowProgress 2s ease-in-out infinite;
}

@keyframes flowProgress {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

.interactive-3d-bracket {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 8px;
    margin-bottom: 16px;
    position: relative;
    overflow: hidden;
}

.part-specs {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.spec-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
}

.spec-label {
    color: var(--text-muted);
}

.spec-value {
    font-weight: 600;
    color: var(--text-primary);
}

@media (max-width: 768px) {
    .ai-generation-showcase {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 20px;
    }
    
    .generation-process {
        padding: 20px 0;
    }
}

.command-interface {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    border-radius: 12px;
    padding: 20px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.terminal-window {
    background: #0a0a0a;
    border-radius: 8px;
    overflow: hidden;
    font-family: 'Courier New', monospace;
}

.terminal-header {
    background: #2d2d2d;
    padding: 10px 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.terminal-title {
    font-size: 0.875rem;
    color: #888;
    margin-left: auto;
}

.terminal-content {
    padding: 20px;
    min-height: 200px;
}

.command-line {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
}

.prompt {
    color: #27c93f;
    font-weight: bold;
}

.typing-text {
    color: #ffffff;
    font-size: 1rem;
}

.cursor {
    color: #ffffff;
    animation: blink 1s infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.parameter-extraction {
    margin-left: 20px;
}

.extraction-line {
    margin: 8px 0;
    color: #888;
    font-size: 0.875rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.extraction-label {
    color: #666;
}

.param-highlight {
    background: rgba(102, 126, 234, 0.3);
    color: #667eea;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: bold;
}

.extraction-line.success {
    color: #27c93f;
    margin-top: 16px;
}

.success-icon {
    font-size: 1.1rem;
}

@media (max-width: 768px) {
    .command-interface {
        padding: 15px;
    }
    
    .terminal-content {
        padding: 15px;
        font-size: 0.875rem;
    }
}

.step-1-bg {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.text-input-animation {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.input-field {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 8px;
    padding: 8px 12px;
    font-size: 0.75rem;
    color: var(--text-primary);
    position: relative;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    min-width: 140px;
    text-align: left;
}

.typing-text {
    font-family: 'Inter', monospace;
    font-size: 0.7rem;
}

.cursor-blink {
    animation: blink 1s infinite;
    color: var(--primary-purple);
    font-weight: bold;
}

.input-glow {
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg, #3B82F6, #1E40AF);
    border-radius: 10px;
    opacity: 0;
    z-index: -1;
    animation: glow-pulse 2s ease-in-out infinite;
}

@keyframes blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0; }
    50% { opacity: 0.3; }
}

.step-2-bg {
    background: linear-gradient(135deg, #ff9a9e, #fecfef);
}

.processing-animation {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.rotating-gears {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.gear {
    position: absolute;
    width: 20px;
    height: 20px;
    color: rgba(255, 255, 255, 0.4);
    stroke-width: 1.5;
}

.gear-1 {
    top: 10px;
    left: 10px;
    animation: rotate-clockwise 3s linear infinite;
}

.gear-2 {
    bottom: 10px;
    right: 10px;
    animation: rotate-counter-clockwise 2s linear infinite;
}

.rotating-logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    z-index: 2;
    animation: logo-pulse 2s ease-in-out infinite;
}

.particle-effects {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(255, 255, 255, 0.6);
    border-radius: 50%;
    animation: particle-float 4s ease-in-out infinite;
}

.particle:nth-child(1) { top: 20%; left: 20%; animation-delay: 0s; }
.particle:nth-child(2) { top: 70%; right: 20%; animation-delay: 1s; }
.particle:nth-child(3) { bottom: 20%; left: 70%; animation-delay: 2s; }
.particle:nth-child(4) { top: 50%; right: 50%; animation-delay: 3s; }

@keyframes rotate-clockwise {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

@keyframes rotate-counter-clockwise {
    from { transform: rotate(0deg); }
    to { transform: rotate(-360deg); }
}

@keyframes logo-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

@keyframes particle-float {
    0%, 100% { transform: translateY(0px) opacity(0.6); }
    50% { transform: translateY(-10px) opacity(1); }
}

.step-3-bg {
    background: linear-gradient(135deg, #89f7fe, #66a6ff);
}

.validation-animation {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-container {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.shield-icon {
    width: 32px;
    height: 32px;
    color: rgba(255, 255, 255, 0.9);
    stroke-width: 2;
    z-index: 1;
}

.checkmark-animation {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
}

.checkmark {
    width: 16px;
    height: 16px;
    color: white;
    stroke-width: 3;
    stroke-linecap: round;
    stroke-linejoin: round;
    stroke-dasharray: 20;
    stroke-dashoffset: 20;
    animation: checkmark-draw 2s ease-in-out infinite;
}

.validation-points {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
}

.validation-point {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: validation-pulse 2s ease-in-out infinite;
}

.point-1 { top: 15%; left: 15%; animation-delay: 0s; }
.point-2 { top: 15%; right: 15%; animation-delay: 0.5s; }
.point-3 { bottom: 15%; left: 15%; animation-delay: 1s; }
.point-4 { bottom: 15%; right: 15%; animation-delay: 1.5s; }

@keyframes checkmark-draw {
    0% { stroke-dashoffset: 20; }
    50% { stroke-dashoffset: 0; }
    100% { stroke-dashoffset: 20; }
}

@keyframes validation-pulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.5); opacity: 1; }
}

.step-4-bg {
    background: linear-gradient(135deg, #a8e063, #56ab2f);
}

.download-animation {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.download-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
}

.arrow-icon {
    width: 24px;
    height: 24px;
    color: white;
    stroke-width: 2;
    animation: arrow-bounce 2s ease-in-out infinite;
}

.file-formats {
    display: flex;
    gap: 4px;
    margin-top: 4px;
}

.file-format {
    background: rgba(255, 255, 255, 0.9);
    color: var(--text-primary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.6rem;
    font-weight: 600;
    animation: file-appear 3s ease-in-out infinite;
}

.file-format.stl { animation-delay: 0s; }
.file-format.step { animation-delay: 0.5s; }
.file-format.gcode { animation-delay: 1s; }

.download-progress {
    width: 80%;
    height: 2px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 1px;
    overflow: hidden;
    margin-top: 4px;
}

.progress-bar {
    height: 100%;
    background: white;
    border-radius: 1px;
    animation: progress-fill 3s ease-in-out infinite;
}

@keyframes arrow-bounce {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-3px); }
}

@keyframes file-appear {
    0%, 60% { opacity: 0; transform: scale(0.8); }
    70%, 100% { opacity: 1; transform: scale(1); }
}

@keyframes progress-fill {
    0% { width: 0%; }
    70% { width: 100%; }
    100% { width: 100%; }
}

@media (max-width: 768px) {
    .input-field {
        min-width: 120px;
        padding: 6px 10px;
    }
    
    .typing-text {
        font-size: 0.65rem;
    }
    
    .gear {
        width: 16px;
        height: 16px;
    }
    
    .rotating-logo {
        width: 35px;
        height: 35px;
    }
    
    .shield-icon {
        width: 28px;
        height: 28px;
    }
    
    .checkmark {
        width: 14px;
        height: 14px;
    }
    
    .arrow-icon {
        width: 20px;
        height: 20px;
    }
    
    .file-format {
        font-size: 0.55rem;
        padding: 2px 5px;
    }
}