/* ═══════════════════════════════════════════════
   AI FACE SLIMMER — DESIGN SYSTEM
   ═══════════════════════════════════════════════ */

/* ── CSS Custom Properties ── */
:root {
    /* Colors */
    --bg-primary: #06060F;
    --bg-secondary: #0C0C1D;
    --bg-surface: rgba(255, 255, 255, 0.03);
    --bg-surface-hover: rgba(255, 255, 255, 0.06);
    --bg-surface-active: rgba(255, 255, 255, 0.08);

    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --purple-400: #C084FC;
    --purple-500: #A855F7;
    --purple-600: #9333EA;
    --purple-700: #7C3AED;
    --blue-400: #60A5FA;
    --blue-500: #3B82F6;
    --blue-600: #2563EB;

    --gradient-primary: linear-gradient(135deg, #A855F7 0%, #6366F1 50%, #3B82F6 100%);
    --gradient-accent: linear-gradient(135deg, #C084FC 0%, #818CF8 50%, #60A5FA 100%);
    --gradient-glow: linear-gradient(135deg, rgba(168, 85, 247, 0.4), rgba(99, 102, 241, 0.4), rgba(59, 130, 246, 0.4));
    --gradient-surface: linear-gradient(135deg, rgba(168, 85, 247, 0.08), rgba(59, 130, 246, 0.04));

    --border-subtle: rgba(255, 255, 255, 0.06);
    --border-medium: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(168, 85, 247, 0.3);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.15), 0 0 60px rgba(139, 92, 246, 0.05);
    --shadow-glow-strong: 0 0 30px rgba(139, 92, 246, 0.3), 0 0 80px rgba(139, 92, 246, 0.1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Spacing */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --transition-fast: 150ms var(--ease-out);
    --transition-base: 300ms var(--ease-out);
    --transition-slow: 500ms var(--ease-out);
}

/* ── Reset & Base ── */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    min-height: 100vh;
}

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

a {
    text-decoration: none;
    color: inherit;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
    color: inherit;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
}

/* ── Layout ── */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.section-header {
    text-align: center;
    margin-bottom: 48px;
}

.section-header h2 {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 12px;
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

/* ── Gradient Text ── */
.gradient-text {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ── Animated Background ── */
.bg-effects {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
}

.gradient-orb-1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.25), transparent 70%);
    top: -200px;
    left: -100px;
    animation: float-orb-1 20s ease-in-out infinite;
}

.gradient-orb-2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.2), transparent 70%);
    top: 40%;
    right: -150px;
    animation: float-orb-2 25s ease-in-out infinite;
}

.gradient-orb-3 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.15), transparent 70%);
    bottom: 10%;
    left: 30%;
    animation: float-orb-3 30s ease-in-out infinite;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 60px 60px;
}

@keyframes float-orb-1 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(80px, 50px) scale(1.1); }
    66% { transform: translate(-40px, 80px) scale(0.9); }
}

@keyframes float-orb-2 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(-60px, -80px) scale(1.15); }
    66% { transform: translate(50px, -30px) scale(0.95); }
}

@keyframes float-orb-3 {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(70px, -60px) scale(1.1); }
    66% { transform: translate(-50px, 40px) scale(0.9); }
}

/* ── Navigation ── */
#navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition-base);
    background: transparent;
}

#navbar.scrolled {
    background: rgba(6, 6, 15, 0.85);
    backdrop-filter: blur(20px) saturate(1.5);
    -webkit-backdrop-filter: blur(20px) saturate(1.5);
    border-bottom: 1px solid var(--border-subtle);
    padding: 12px 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition-fast);
}

.logo:hover {
    opacity: 0.85;
}

.logo-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: -0.02em;
}

.logo-accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-cta {
    padding: 10px 24px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    font-weight: 600;
    font-size: var(--font-size-sm);
    letter-spacing: 0.01em;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-glow);
}

.nav-cta:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow-strong);
}

/* Secondary nav link (Before & After) */
.nav-link {
    padding: 9px 18px;
    border-radius: var(--radius-full);
    background: transparent;
    border: 1px solid var(--border-medium);
    font-weight: 600;
    font-size: var(--font-size-sm);
    letter-spacing: 0.01em;
    color: var(--text-secondary);
    transition: var(--transition-fast);
    white-space: nowrap;
    text-decoration: none;
}

.nav-link:hover {
    background: var(--bg-surface-hover);
    border-color: rgba(168, 85, 247, 0.4);
    color: var(--text-primary);
}

.nav-link.active-page {
    border-color: rgba(168, 85, 247, 0.5);
    color: var(--purple-400);
    background: rgba(168, 85, 247, 0.08);
}

/* Group wrapper for nav right side */
.nav-links {
    display: flex;
    align-items: center;
    gap: 10px;
}

@media (max-width: 480px) {
    .nav-link { display: none; }
}

/* ── Hero Section ── */
#hero {
    position: relative;
    z-index: 1;
    padding: 140px 0 80px;
    text-align: center;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    border-radius: var(--radius-full);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--purple-400);
    margin-bottom: 32px;
    animation: fadeInDown 0.8s var(--ease-out);
}

.badge-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--purple-500);
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(168, 85, 247, 0.4); }
    50% { opacity: 0.7; box-shadow: 0 0 0 6px rgba(168, 85, 247, 0); }
}

#hero h1 {
    font-size: var(--font-size-6xl);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.04em;
    margin-bottom: 24px;
    max-width: 800px;
    animation: fadeInUp 0.8s var(--ease-out) 0.1s both;
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 620px;
    margin-bottom: 48px;
    line-height: 1.7;
    animation: fadeInUp 0.8s var(--ease-out) 0.2s both;
}

/* ── Two-column Hero Layout ── */
.hero-columns {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    width: 100%;
    max-width: 960px;
    align-items: center;
    animation: fadeInUp 0.8s var(--ease-out) 0.3s both;
}

/* ── Hero Demo Image (Left Column) ── */
.hero-demo {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.demo-image-wrapper {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border: 1px solid var(--border-subtle);
    background: var(--bg-secondary);
}

.demo-face-img {
    width: 100%;
    display: block;
    object-fit: cover;
    aspect-ratio: 1;
}

/* AI Scan Corner Brackets */
.scan-corner {
    position: absolute;
    width: 40px;
    height: 40px;
    z-index: 2;
}

.scan-tl {
    top: 12%;
    left: 20%;
    border-top: 3px solid rgba(168, 85, 247, 0.8);
    border-left: 3px solid rgba(168, 85, 247, 0.8);
    border-radius: 4px 0 0 0;
    animation: pulse-corner 2.5s ease-in-out infinite;
}

.scan-tr {
    top: 12%;
    right: 20%;
    border-top: 3px solid rgba(168, 85, 247, 0.8);
    border-right: 3px solid rgba(168, 85, 247, 0.8);
    border-radius: 0 4px 0 0;
    animation: pulse-corner 2.5s ease-in-out infinite 0.3s;
}

.scan-bl {
    bottom: 28%;
    left: 25%;
    border-bottom: 3px solid rgba(59, 130, 246, 0.8);
    border-left: 3px solid rgba(59, 130, 246, 0.8);
    border-radius: 0 0 0 4px;
    animation: pulse-corner 2.5s ease-in-out infinite 0.6s;
}

.scan-br {
    bottom: 28%;
    right: 25%;
    border-bottom: 3px solid rgba(59, 130, 246, 0.8);
    border-right: 3px solid rgba(59, 130, 246, 0.8);
    border-radius: 0 0 4px 0;
    animation: pulse-corner 2.5s ease-in-out infinite 0.9s;
}

@keyframes pulse-corner {
    0%, 100% { opacity: 0.7; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.08); }
}

/* Animated scan line across demo image */
.demo-scan-line {
    position: absolute;
    left: 15%;
    right: 15%;
    height: 2px;
    background: linear-gradient(90deg, transparent, rgba(168, 85, 247, 0.6), rgba(59, 130, 246, 0.6), transparent);
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.4);
    z-index: 3;
    animation: demo-scan 3.5s ease-in-out infinite;
    border-radius: 1px;
}

@keyframes demo-scan {
    0% { top: 10%; opacity: 0; }
    15% { opacity: 1; }
    85% { opacity: 1; }
    100% { top: 75%; opacity: 0; }
}

/* Thumbnail Strip */
.demo-thumbnails {
    display: flex;
    justify-content: center;
    gap: 12px;
    padding: 8px 0;
}

.demo-thumb {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    opacity: 0.5;
    transition: var(--transition-fast);
}

.demo-thumb.active {
    opacity: 1;
}

.demo-thumb:hover {
    opacity: 0.85;
}

.demo-thumb img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.demo-thumb.active img {
    border-color: var(--purple-500);
    box-shadow: 0 0 12px rgba(168, 85, 247, 0.3);
}

.thumb-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.demo-thumb.active .thumb-label {
    color: var(--purple-400);
}

/* ── Hero Upload (Right Column) ── */
.hero-upload {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hero-upload .upload-area {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.hero-upload .upload-box {
    width: 100%;
    min-height: 280px;
    border-radius: var(--radius-2xl);
    border: 2px dashed var(--border-medium);
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-upload .upload-box::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-surface);
    opacity: 0;
    transition: var(--transition-base);
}

.hero-upload .upload-box:hover,
.hero-upload .upload-box.drag-over {
    border-color: var(--purple-500);
    background: var(--bg-surface-hover);
    box-shadow: var(--shadow-glow);
}

.hero-upload .upload-box:hover::before,
.hero-upload .upload-box.drag-over::before {
    opacity: 1;
}

.hero-upload .upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 32px 24px;
    position: relative;
    z-index: 1;
    text-align: center;
}

.upload-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--text-primary);
}

/* "Choose Image" button inside upload box */
.upload-choose-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    font-weight: 600;
    font-size: var(--font-size-base);
    color: white;
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow);
    margin-top: 8px;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    border: none;
}

.upload-choose-btn::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
    animation: shimmer 3s ease-in-out infinite;
}

.upload-choose-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-strong);
}

/* Privacy trust message under upload button */
.upload-privacy {
    font-size: var(--font-size-sm);
    color: #6EE7B7;
    font-weight: 500;
    margin-top: 4px;
    padding: 8px 16px;
    border-radius: var(--radius-md);
    background: rgba(16, 185, 129, 0.08);
    border: 1px solid rgba(16, 185, 129, 0.15);
    text-align: center;
    line-height: 1.4;
    letter-spacing: 0.01em;
}

.hero-stats {
    display: flex;
    align-items: center;
    gap: 32px;
    margin-top: 48px;
    padding: 24px 40px;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    animation: fadeInUp 0.8s var(--ease-out) 0.4s both;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 4px;
    display: block;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border-subtle);
}

/* ── Upload Section (legacy — now inside hero) ── */
#upload-section {
    position: relative;
    z-index: 1;
}

.upload-area {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}

.upload-box {
    width: 100%;
    min-height: 320px;
    border-radius: var(--radius-2xl);
    border: 2px dashed var(--border-medium);
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-base);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-box::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-surface);
    opacity: 0;
    transition: var(--transition-base);
}

.upload-box:hover,
.upload-box.drag-over {
    border-color: var(--purple-500);
    background: var(--bg-surface-hover);
    box-shadow: var(--shadow-glow);
}

.upload-box:hover::before,
.upload-box.drag-over::before {
    opacity: 1;
}

.upload-box.drag-over {
    transform: scale(1.01);
}

.upload-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 40px;
    position: relative;
    z-index: 1;
}

.upload-icon-wrapper {
    position: relative;
}

.upload-icon-glow {
    position: absolute;
    inset: -20px;
    background: radial-gradient(circle, rgba(168, 85, 247, 0.15), transparent 70%);
    border-radius: 50%;
    animation: pulse-glow 3s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.2); opacity: 1; }
}

.upload-icon {
    position: relative;
    z-index: 1;
}

.upload-text {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    text-align: center;
}

.upload-link {
    color: var(--purple-400);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
}

.upload-link:hover {
    color: var(--purple-300, #D8B4FE);
    text-decoration: underline;
}

.upload-formats {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* Upload Preview */
.upload-preview {
    display: none;
    width: 100%;
    height: 100%;
    position: relative;
}

.upload-preview.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-preview img {
    max-width: 100%;
    max-height: 400px;
    border-radius: var(--radius-lg);
    object-fit: contain;
}

.change-photo-btn {
    position: absolute;
    top: 16px;
    right: 16px;
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-medium);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: var(--transition-fast);
}

.change-photo-btn:hover {
    background: rgba(0, 0, 0, 0.85);
    border-color: var(--border-hover);
}

/* Process Button */
.process-btn {
    display: none !important;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    font-weight: 700;
    font-size: var(--font-size-lg);
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow-strong);
    position: relative;
    overflow: hidden;
}

.process-btn.visible {
    display: flex !important;
}

.process-btn::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%) rotate(45deg); }
    100% { transform: translateX(100%) rotate(45deg); }
}

.process-btn:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 0 40px rgba(139, 92, 246, 0.4), 0 0 80px rgba(139, 92, 246, 0.15);
}

/* Error Message */
.error-message {
    display: none;
    align-items: center;
    gap: 10px;
    padding: 14px 20px;
    border-radius: var(--radius-md);
    background: rgba(239, 68, 68, 0.08);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: #FCA5A5;
    font-size: var(--font-size-sm);
    margin-top: 16px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeIn 0.3s var(--ease-out);
}

.error-message.visible {
    display: flex;
}

/* ── Processing Section ── */
#processing-section {
    display: none;
    position: relative;
    z-index: 1;
    padding: 80px 0;
}

#processing-section.active {
    display: block;
}

.processing-container {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.processing-visual {
    width: 160px;
    height: 160px;
    position: relative;
    margin-bottom: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scan-ring {
    position: absolute;
    border-radius: 50%;
    border: 2px solid transparent;
}

.ring-1 {
    width: 100%;
    height: 100%;
    border-top-color: var(--purple-500);
    border-right-color: rgba(168, 85, 247, 0.3);
    animation: spin-ring 2s linear infinite;
}

.ring-2 {
    width: 80%;
    height: 80%;
    border-bottom-color: var(--blue-500);
    border-left-color: rgba(59, 130, 246, 0.3);
    animation: spin-ring 2.5s linear infinite reverse;
}

.ring-3 {
    width: 60%;
    height: 60%;
    border-top-color: var(--purple-400);
    border-right-color: rgba(192, 132, 252, 0.3);
    animation: spin-ring 1.8s linear infinite;
}

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

.processing-face-icon {
    position: relative;
    z-index: 1;
    animation: pulse-face 1.5s ease-in-out infinite;
}

@keyframes pulse-face {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.08); opacity: 0.8; }
}

.scan-line {
    position: absolute;
    left: 10%;
    right: 10%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--purple-500), transparent);
    animation: scan-move 2s ease-in-out infinite;
    border-radius: 1px;
    box-shadow: 0 0 10px var(--purple-500);
}

@keyframes scan-move {
    0% { top: 15%; opacity: 0; }
    20% { opacity: 1; }
    80% { opacity: 1; }
    100% { top: 85%; opacity: 0; }
}

#processing-section h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.processing-subtitle {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: var(--font-size-sm);
}

.progress-bar {
    width: 100%;
    max-width: 400px;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--bg-surface-active);
    overflow: hidden;
    margin-bottom: 12px;
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    transition: width 0.4s var(--ease-out);
    position: relative;
}

.progress-fill::after {
    content: '';
    position: absolute;
    right: 0;
    top: 0;
    width: 20px;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3));
    border-radius: var(--radius-full);
}

.progress-text {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* ── Results Section ── */
#results-section {
    display: none;
    position: relative;
    z-index: 1;
    padding: 80px 0;
}

#results-section.active {
    display: block;
    animation: fadeInUp 0.6s var(--ease-out);
}

.comparison-wrapper {
    max-width: 700px;
    margin: 0 auto 32px;
}

.comparison-container {
    position: relative;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    border: 1px solid var(--border-subtle);
    background: var(--bg-secondary);
    cursor: col-resize;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

.comparison-img {
    width: 100%;
    display: block;
}

.comparison-after-clip {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    clip-path: inset(0 0 0 50%);
    transition: none;
}

.comparison-img-after {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.comparison-label {
    position: absolute;
    top: 20px;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    font-size: var(--font-size-sm);
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.label-before {
    left: 20px;
}

.label-after {
    right: 20px;
}

.comparison-handle {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 50%;
    width: 4px;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 5;
}

.handle-line {
    flex: 1;
    width: 2px;
    background: white;
    box-shadow: 0 0 4px rgba(0, 0, 0, 0.5);
}

.handle-circle {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: white;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4), var(--shadow-glow);
    flex-shrink: 0;
    transition: transform var(--transition-fast);
}

.handle-circle:hover {
    transform: scale(1.1);
}

.handle-circle svg path {
    stroke: #1a1a2e;
}

/* Intensity Control */
.intensity-control {
    display: none;
    max-width: 400px;
    margin: 0 auto 32px;
    text-align: center;
}

.intensity-control.visible {
    display: block;
    animation: fadeIn 0.3s var(--ease-out);
}

.intensity-control label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 16px;
}

.slider-label {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    white-space: nowrap;
}

input[type="range"]::-webkit-slider-runnable-track {
    height: 6px;
    border-radius: 3px;
    background: var(--bg-surface-active);
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--gradient-primary);
    margin-top: -8px;
    cursor: pointer;
    box-shadow: var(--shadow-glow);
    transition: var(--transition-fast);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: var(--shadow-glow-strong);
}

input[type="range"]::-moz-range-track {
    height: 6px;
    border-radius: 3px;
    background: var(--bg-surface-active);
    border: none;
}

input[type="range"]::-moz-range-thumb {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--gradient-primary);
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow-glow);
}

/* Result Actions */
.result-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary,
.action-btn.primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow-strong);
}

.btn-secondary,
.action-btn.secondary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    background: var(--bg-surface);
    border: 1px solid var(--border-medium);
    font-weight: 600;
    font-size: var(--font-size-base);
    transition: var(--transition-base);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.btn-secondary:hover {
    background: var(--bg-surface-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

/* Share Button */
.btn-share {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    background: linear-gradient(135deg, #10B981, #3B82F6);
    font-weight: 600;
    font-size: var(--font-size-base);
    color: white;
    transition: var(--transition-base);
    box-shadow: 0 0 20px rgba(16, 185, 129, 0.25);
    position: relative;
    overflow: hidden;
    border: none;
    cursor: pointer;
}

.btn-share::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent 40%, rgba(255,255,255,0.1) 50%, transparent 60%);
    animation: shimmer 3s ease-in-out infinite;
}

.btn-share:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(16, 185, 129, 0.4), 0 0 60px rgba(16, 185, 129, 0.15);
}

/* ── Benefits Section ── */
#benefits-section {
    position: relative;
    z-index: 1;
    padding: 100px 0;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    margin-bottom: 48px;
}

.feature-card {
    padding: 32px 24px;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: var(--transition-base);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-surface);
    opacity: 0;
    transition: var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon-wrap {
    position: relative;
    z-index: 1;
    margin-bottom: 20px;
}

.feature-icon {
    font-size: 36px;
    line-height: 1;
    filter: drop-shadow(0 0 8px rgba(168, 85, 247, 0.2));
}

.feature-card h3 {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.feature-card p {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

.trust-text-block {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 40px;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    position: relative;
    overflow: hidden;
}

.trust-text-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-primary);
}

.trust-text-block p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: var(--font-size-base);
}

/* ── Examples Section ── */
#examples-section {
    position: relative;
    z-index: 1;
    padding: 100px 0;
}

.examples-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.example-card {
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    transition: var(--transition-base);
}

.example-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.example-comparison {
    display: flex;
    height: 100%;
}

.example-before,
.example-after {
    flex: 1;
    position: relative;
    overflow: hidden;
}

.example-before img,
.example-after img {
    width: 100%;
    height: 320px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.example-card:hover .example-before img,
.example-card:hover .example-after img {
    transform: scale(1.04);
}

/* Simulate "before" by slightly widening the face */
.example-before img {
    transform: scaleX(1.06);
    transform-origin: center;
}

.example-card:hover .example-before img {
    transform: scaleX(1.06) scale(1.04);
}

.example-label {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 14px;
    border-radius: var(--radius-full);
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    font-size: var(--font-size-xs);
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    border: 1px solid rgba(255, 255, 255, 0.08);
    white-space: nowrap;
}

.example-divider {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 1px;
    background: var(--border-medium);
    position: relative;
    z-index: 2;
}

.divider-line {
    flex: 1;
    width: 1px;
    background: rgba(255, 255, 255, 0.1);
}

.divider-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: var(--shadow-glow);
}

/* ── CTA Section ── */
#cta-section {
    position: relative;
    z-index: 1;
    padding: 80px 0;
}

.cta-card {
    max-width: 800px;
    margin: 0 auto;
    padding: 64px 48px;
    border-radius: var(--radius-2xl);
    text-align: center;
    position: relative;
    overflow: hidden;
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.cta-glow {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 600px 400px at 30% 20%, rgba(124, 58, 237, 0.12), transparent),
        radial-gradient(ellipse 500px 300px at 70% 80%, rgba(37, 99, 235, 0.1), transparent);
}

.cta-card h2 {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-4xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    line-height: 1.2;
}

.cta-card p {
    position: relative;
    z-index: 1;
    color: var(--text-secondary);
    font-size: var(--font-size-lg);
    margin-bottom: 32px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* CTA button style (used in CTA section) */
.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 36px;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    font-weight: 700;
    font-size: var(--font-size-lg);
    letter-spacing: 0.01em;
    transition: var(--transition-base);
    box-shadow: var(--shadow-glow-strong);
    position: relative;
    overflow: hidden;
}

.hero-cta::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
    opacity: 0;
    transition: var(--transition-fast);
}

.hero-cta:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 0 40px rgba(139, 92, 246, 0.4), 0 0 80px rgba(139, 92, 246, 0.15);
}

.hero-cta:hover::before {
    opacity: 1;
}

.cta-card .hero-cta {
    position: relative;
    z-index: 1;
    animation: none;
}

/* ── SEO Content Sections ── */
.seo-section {
    position: relative;
    z-index: 1;
    padding: 60px 0;
}

.seo-section + .seo-section {
    padding-top: 0;
}

.seo-content-block {
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 48px;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}

.seo-content-block::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--gradient-primary);
}

.seo-content-block h2 {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
    line-height: 1.3;
}

.seo-content-block h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
    line-height: 1.3;
}

.seo-content-block p {
    color: var(--text-secondary);
    line-height: 1.85;
    font-size: var(--font-size-base);
    margin-bottom: 16px;
}

.seo-content-block p:last-child {
    margin-bottom: 0;
}

/* ── How-To Steps Grid ── */
.howto-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.howto-step {
    padding: 32px 24px;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition-base);
}

.howto-step::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-surface);
    opacity: 0;
    transition: var(--transition-base);
}

.howto-step:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.howto-step:hover::before {
    opacity: 1;
}

.howto-number {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xl);
    font-weight: 800;
    margin: 0 auto 20px;
    position: relative;
    z-index: 1;
    box-shadow: var(--shadow-glow);
}

.howto-step h3 {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.howto-step p {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ── Features Table ── */
.features-table-wrapper {
    max-width: 900px;
    margin: 0 auto;
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.features-table {
    width: 100%;
    border-collapse: collapse;
}

.features-table thead {
    background: rgba(168, 85, 247, 0.08);
}

.features-table th {
    padding: 16px 24px;
    text-align: left;
    font-size: var(--font-size-sm);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--purple-400);
    border-bottom: 1px solid var(--border-medium);
}

.features-table td {
    padding: 14px 24px;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-subtle);
    line-height: 1.5;
}

.features-table tbody tr {
    transition: var(--transition-fast);
}

.features-table tbody tr:hover {
    background: rgba(168, 85, 247, 0.04);
}

.features-table tbody tr:last-child td {
    border-bottom: none;
}

/* ── Use Cases Grid ── */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    max-width: 1000px;
    margin: 0 auto;
}

.use-case-card {
    padding: 32px 24px;
    border-radius: var(--radius-xl);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: var(--transition-base);
}

.use-case-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-surface);
    opacity: 0;
    transition: var(--transition-base);
}

.use-case-card:hover {
    transform: translateY(-4px);
    border-color: var(--border-hover);
    box-shadow: var(--shadow-glow);
}

.use-case-card:hover::before {
    opacity: 1;
}

.use-case-icon {
    font-size: 40px;
    line-height: 1;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
    filter: drop-shadow(0 0 8px rgba(168, 85, 247, 0.2));
}

.use-case-card h3 {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: 12px;
    letter-spacing: -0.01em;
}

.use-case-card p {
    position: relative;
    z-index: 1;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ── FAQ Accordion ── */
.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    border-radius: var(--radius-lg);
    background: var(--bg-surface);
    border: 1px solid var(--border-subtle);
    overflow: hidden;
    transition: var(--transition-base);
}

.faq-item:hover {
    border-color: var(--border-hover);
}

.faq-item.active {
    border-color: rgba(168, 85, 247, 0.3);
    box-shadow: var(--shadow-glow);
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 24px;
    text-align: left;
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    transition: var(--transition-fast);
    background: none;
    border: none;
}

.faq-question:hover {
    color: var(--purple-400);
}

.faq-chevron {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform 0.3s var(--ease-out);
}

.faq-item.active .faq-chevron {
    transform: rotate(180deg);
    color: var(--purple-400);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s var(--ease-out), padding 0.3s var(--ease-out);
    padding: 0 24px;
}

.faq-item.active .faq-answer {
    max-height: 300px;
    padding: 0 24px 20px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: var(--font-size-sm);
}

/* ── Footer ── */
#site-footer {
    position: relative;
    z-index: 1;
    padding: 40px 0;
    border-top: 1px solid var(--border-subtle);
}

.footer-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.footer-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo .logo-text {
    font-size: var(--font-size-base);
}

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

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--purple-400);
}

.footer-bottom {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 24px;
    border-top: 1px solid var(--border-subtle);
}

.footer-security {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.footer-copyright {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* ── Model Loader Overlay ── */
.model-loader {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(6, 6, 15, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.6s var(--ease-out);
}

.model-loader.hidden {
    opacity: 0;
    pointer-events: none;
}

.loader-content {
    text-align: center;
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 3px solid var(--border-subtle);
    border-top-color: var(--purple-500);
    margin: 0 auto 20px;
    animation: spin-ring 0.8s linear infinite;
}

.loader-content p {
    font-weight: 600;
    margin-bottom: 4px;
}

.loader-sub {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* ── Animations ── */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

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

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ── Responsive Design ── */

/* Tablet */
@media (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .examples-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Hide the middle example card on tablets to keep a clean 2-col */
    .example-card:nth-child(3) {
        grid-column: 1 / -1;
        max-width: 500px;
        justify-self: center;
    }

    /* SEO Sections - Tablet */
    .howto-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .use-cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .use-case-card:last-child {
        grid-column: 1 / -1;
        max-width: 400px;
        justify-self: center;
    }

    .features-table th,
    .features-table td {
        padding: 12px 16px;
    }
}

/* ── MOBILE: Primary breakpoint (<768px : most phones) ── */
@media (max-width: 768px) {
    /* Global mobile spacing */
    .container {
        padding: 0 16px;
    }

    /* ── Navbar ── */
    #navbar {
        padding: 12px 0;
    }

    #navbar.scrolled {
        padding: 10px 0;
    }

    .nav-container {
        padding: 0 16px;
    }

    .logo-text {
        font-size: var(--font-size-base);
    }

    .nav-cta {
        padding: 10px 20px;
        font-size: var(--font-size-sm);
    }

    /* ── Hero Section ── */
    #hero {
        padding: 110px 0 40px;
    }

    #hero h1 {
        font-size: var(--font-size-3xl);
        line-height: 1.15;
    }

    .hero-badge {
        font-size: var(--font-size-xs);
        padding: 6px 14px;
        margin-bottom: 20px;
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
        margin-bottom: 24px;
        padding: 0 4px;
    }

    /* Two-column -> stacked on mobile */
    .hero-columns {
        grid-template-columns: 1fr;
        gap: 24px;
        max-width: 100%;
    }

    .hero-demo {
        order: 1;
    }

    .hero-upload {
        order: 2;
    }

    .demo-image-wrapper {
        border-radius: var(--radius-xl);
    }

    .scan-corner {
        width: 28px;
        height: 28px;
    }

    .demo-thumbnails {
        gap: 8px;
    }

    .demo-thumb img {
        width: 40px;
        height: 40px;
    }

    .thumb-label {
        font-size: 0.55rem;
    }

    .hero-upload .upload-box {
        min-height: 220px;
        border-radius: var(--radius-xl);
    }

    .hero-upload .upload-content {
        padding: 24px 16px;
        gap: 10px;
    }

    .upload-title {
        font-size: var(--font-size-lg);
    }

    .upload-choose-btn {
        width: 100%;
        justify-content: center;
        padding: 14px 24px;
        min-height: 48px;
    }

    .hero-stats {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 0;
        padding: 20px 16px;
        margin-top: 32px;
        width: 100%;
    }

    .stat {
        flex: 1;
        min-width: 90px;
        padding: 8px 4px;
    }

    .stat-value {
        font-size: var(--font-size-xl);
    }

    .stat-label {
        font-size: 0.65rem;
        letter-spacing: 0.03em;
    }

    .stat-divider {
        width: 1px;
        height: 32px;
    }

    /* ── Section Headers ── */
    .section-header {
        margin-bottom: 32px;
    }

    .section-header h2 {
        font-size: var(--font-size-2xl);
        padding: 0 8px;
    }

    .section-header p {
        font-size: var(--font-size-base);
        padding: 0 8px;
    }

    /* ── Upload Section ── */
    #upload-section {
        padding: 40px 0 60px;
    }

    .upload-box {
        min-height: 240px;
        border-radius: var(--radius-xl);
    }

    .upload-content {
        padding: 28px 20px;
        gap: 12px;
    }

    .upload-icon-wrapper svg {
        width: 40px;
        height: 40px;
    }

    .upload-text {
        font-size: var(--font-size-base);
        line-height: 1.5;
    }

    .upload-formats {
        font-size: var(--font-size-xs);
    }

    .upload-preview img {
        max-height: 300px;
    }

    /* Change Photo button - larger for touch */
    .change-photo-btn {
        padding: 10px 18px;
        font-size: var(--font-size-sm);
        min-height: 44px;
    }

    /* Process button full-width */
    .process-btn {
        width: 100%;
        justify-content: center;
        padding: 16px 32px;
        min-height: 52px;
    }

    .process-btn.visible {
        display: flex;
    }

    /* Error message */
    .error-message {
        margin-top: 12px;
        padding: 12px 16px;
        font-size: var(--font-size-sm);
    }

    /* ── Processing Section ── */
    #processing-section {
        padding: 60px 0;
    }

    .processing-visual {
        width: 130px;
        height: 130px;
        margin-bottom: 28px;
    }

    #processing-section h3 {
        font-size: var(--font-size-xl);
    }

    .processing-subtitle {
        font-size: var(--font-size-xs);
        padding: 0 16px;
    }

    /* ── Results Section ── */
    #results-section {
        padding: 20px 0 40px;
    }

    .comparison-wrapper {
        margin-bottom: 16px;
    }

    .comparison-container {
        border-radius: var(--radius-xl);
        max-height: 55vh;
    }

    .comparison-img-before,
    .comparison-img-after {
        max-height: 55vh;
        object-fit: contain;
    }

    .comparison-label {
        top: 12px;
        font-size: var(--font-size-xs);
        padding: 4px 12px;
    }

    .label-before {
        left: 12px;
    }

    .label-after {
        right: 12px;
    }

    /* Make comparison handle bigger for touch */
    .handle-circle {
        width: 48px;
        height: 48px;
    }

    .handle-circle svg {
        width: 22px;
        height: 22px;
    }

    .handle-line {
        width: 3px;
    }

    /* Intensity control */
    .intensity-control {
        margin: 0 auto 24px;
        padding: 0 8px;
    }

    /* Result action buttons - full width stacked */
    .result-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 0;
    }

    .result-actions .btn-primary,
    .result-actions .btn-secondary {
        width: 100%;
        justify-content: center;
        padding: 16px 24px;
        min-height: 52px;
    }

    /* ── Benefits Section ── */
    #benefits-section {
        padding: 60px 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 16px;
        margin-bottom: 32px;
    }

    .feature-card {
        padding: 24px 20px;
        text-align: left;
        display: flex;
        flex-direction: row;
        align-items: flex-start;
        gap: 16px;
    }

    .feature-icon-wrap {
        margin-bottom: 0;
        flex-shrink: 0;
    }

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

    .feature-card h3 {
        font-size: var(--font-size-base);
        margin-bottom: 6px;
    }

    .feature-card p {
        font-size: var(--font-size-sm);
        line-height: 1.5;
    }

    .trust-text-block {
        padding: 20px 16px;
    }

    .trust-text-block p {
        font-size: var(--font-size-sm);
        line-height: 1.7;
    }

    /* ── Examples Section ── */
    #examples-section {
        padding: 60px 0;
    }

    .examples-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .example-before img,
    .example-after img {
        height: 200px;
    }

    .example-label {
        font-size: 0.65rem;
        padding: 3px 10px;
    }

    .divider-icon {
        width: 24px;
        height: 24px;
    }

    .divider-icon svg {
        width: 12px;
        height: 12px;
    }

    /* ── SEO Sections - Mobile ── */
    .seo-section {
        padding: 40px 0;
    }

    .seo-content-block {
        padding: 24px 20px;
    }

    .seo-content-block h2 {
        font-size: var(--font-size-2xl);
    }

    .seo-content-block h3 {
        font-size: var(--font-size-xl);
    }

    .seo-content-block p {
        font-size: var(--font-size-sm);
        line-height: 1.7;
    }

    .howto-grid {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }

    .howto-step {
        padding: 24px 16px;
    }

    .howto-number {
        width: 40px;
        height: 40px;
        font-size: var(--font-size-base);
    }

    .howto-step h3 {
        font-size: var(--font-size-base);
    }

    .features-table-wrapper {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .features-table {
        min-width: 580px;
    }

    .features-table th,
    .features-table td {
        padding: 10px 14px;
        font-size: var(--font-size-xs);
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .use-case-card:last-child {
        grid-column: auto;
        max-width: none;
        justify-self: auto;
    }

    .use-case-card {
        padding: 24px 20px;
        text-align: left;
        display: flex;
        flex-direction: row;
        align-items: flex-start;
        gap: 16px;
    }

    .use-case-icon {
        margin-bottom: 0;
        flex-shrink: 0;
        font-size: 32px;
    }

    .faq-question {
        padding: 16px 20px;
        font-size: var(--font-size-sm);
    }

    .faq-answer {
        padding: 0 20px;
    }

    .faq-item.active .faq-answer {
        padding: 0 20px 16px;
    }

    .faq-answer p {
        font-size: var(--font-size-xs);
    }

    /* ── CTA Section ── */
    #cta-section {
        padding: 40px 0;
    }

    .cta-card {
        padding: 36px 20px;
        border-radius: var(--radius-xl);
    }

    .cta-card h2 {
        font-size: var(--font-size-2xl);
        line-height: 1.25;
    }

    .cta-card p {
        font-size: var(--font-size-base);
        margin-bottom: 24px;
    }

    .cta-card .hero-cta {
        width: 100%;
        justify-content: center;
    }

    /* ── Footer ── */
    #site-footer {
        padding: 32px 0;
        padding-bottom: calc(32px + env(safe-area-inset-bottom, 0px));
    }

    .footer-top {
        flex-direction: column;
        align-items: center;
        gap: 16px;
        text-align: center;
    }

    .footer-links {
        gap: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .footer-links a {
        min-height: 44px;
        display: flex;
        align-items: center;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .footer-security {
        font-size: var(--font-size-xs);
    }

    .footer-copyright {
        font-size: var(--font-size-xs);
    }

    /* ── Model Loader ── */
    .loader-content {
        padding: 0 24px;
        text-align: center;
    }

    .loader-content p {
        font-size: var(--font-size-base);
    }

    /* ── Range slider bigger thumb for touch ── */
    input[type="range"]::-webkit-slider-thumb {
        width: 28px;
        height: 28px;
        margin-top: -11px;
    }

    input[type="range"]::-moz-range-thumb {
        width: 28px;
        height: 28px;
    }

    input[type="range"]::-webkit-slider-runnable-track {
        height: 8px;
        border-radius: 4px;
    }

    input[type="range"]::-moz-range-track {
        height: 8px;
        border-radius: 4px;
    }
}

/* ── MOBILE SMALL: Very small phones (<400px) ── */
@media (max-width: 400px) {
    #hero h1 {
        font-size: var(--font-size-2xl);
    }

    .hero-stats {
        padding: 16px 12px;
    }

    .stat-value {
        font-size: var(--font-size-lg);
    }

    .stat-label {
        font-size: 0.6rem;
    }

    .stat-divider {
        height: 24px;
    }

    .section-header h2 {
        font-size: var(--font-size-xl);
    }

    .upload-box {
        min-height: 200px;
    }

    .upload-content {
        padding: 20px 16px;
    }

    .upload-text {
        font-size: var(--font-size-sm);
    }

    .cta-card h2 {
        font-size: var(--font-size-xl);
    }

    .cta-card p {
        font-size: var(--font-size-sm);
    }

    .feature-card {
        padding: 20px 16px;
        gap: 12px;
    }

    .example-before img,
    .example-after img {
        height: 170px;
    }
}

/* ── Touch device hover fix ── */
@media (hover: none) and (pointer: coarse) {
    /* Disable hover transforms on touch devices */
    .feature-card:hover {
        transform: none;
    }

    .example-card:hover {
        transform: none;
    }

    .example-card:hover .example-before img,
    .example-card:hover .example-after img {
        transform: none;
    }

    .example-card:hover .example-before img {
        transform: scaleX(1.06);
    }

    .hero-cta:hover {
        transform: none;
    }

    .btn-primary:hover {
        transform: none;
    }

    .btn-secondary:hover {
        transform: none;
    }

    .nav-cta:hover {
        transform: none;
    }

    .process-btn:hover {
        transform: none;
    }

    /* Add active states instead for tap feedback */
    .hero-cta:active,
    .btn-primary:active,
    .nav-cta:active,
    .process-btn:active {
        transform: scale(0.97);
        opacity: 0.9;
    }

    .btn-secondary:active {
        transform: scale(0.97);
        background: var(--bg-surface-active);
    }

    .feature-card:active {
        background: var(--bg-surface-hover);
    }

    /* Larger touch area for comparison handle */
    .comparison-handle {
        width: 44px;
    }

    .handle-circle {
        width: 52px;
        height: 52px;
    }
}

/* iOS safe areas */
@supports (padding: env(safe-area-inset-bottom)) {
    #site-footer {
        padding-bottom: calc(32px + env(safe-area-inset-bottom));
    }

    #navbar {
        padding-top: calc(12px + env(safe-area-inset-top));
    }

    #hero {
        padding-top: calc(120px + env(safe-area-inset-top));
    }
}

/* Landscape phone */
@media (max-height: 500px) and (orientation: landscape) {
    #hero {
        padding: 80px 0 40px;
    }

    #hero h1 {
        font-size: var(--font-size-2xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-sm);
        margin-bottom: 16px;
    }

    .hero-stats {
        margin-top: 24px;
    }

    .upload-box {
        min-height: 180px;
    }

    .processing-visual {
        width: 100px;
        height: 100px;
    }
}

/* ── Footer Languages ── */
.footer-languages-wrapper {
    margin-top: 32px;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: left;
    max-width: 400px; /* To make it wrap slightly like a clean grid block */
}
.footer-languages-title {
    font-size: 0.75rem;
    letter-spacing: 1px;
    color: var(--text-primary);
    margin-bottom: 16px;
    font-weight: 700;
    text-transform: uppercase;
}
.footer-languages-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: flex-start;
}
.lang-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 6px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
    font-size: 0.75rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-fast);
}
.lang-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.4);
}
.lang-btn.active {
    background: white;
    color: var(--blue-500);
    border-color: white;
}

/* ═══════════════════════════════════════════════
   EXPLORE MORE TOOLS SECTION
   ═══════════════════════════════════════════════ */

#explore-tools {
    position: relative;
    z-index: 1;
}

/* 3-column grid, collapses to 2 then 1 */
.explore-tools-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

@media (max-width: 900px) {
    .explore-tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .explore-tools-grid {
        grid-template-columns: 1fr;
    }
}

/* Individual card */
.explore-tool-card {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 28px 24px 24px;
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-subtle);
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    text-decoration: none;
    color: var(--text-primary);
    overflow: hidden;
    transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
    cursor: pointer;
}

/* Hover lift + border glow */
.explore-tool-card:hover {
    transform: translateY(-6px);
    border-color: var(--border-hover);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45), var(--shadow-glow);
}

/* Radial glow that appears on hover */
.explore-tool-card .tool-card-glow {
    position: absolute;
    inset: 0;
    background: var(--gradient-surface);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
    border-radius: inherit;
}

.explore-tool-card:hover .tool-card-glow {
    opacity: 1;
}

/* Icon wrapper */
.tool-card-icon-wrap {
    width: 52px;
    height: 52px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.15), rgba(59, 130, 246, 0.10));
    border: 1px solid rgba(168, 85, 247, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background var(--transition-base), transform var(--transition-base);
    position: relative;
    z-index: 1;
}

.explore-tool-card:hover .tool-card-icon-wrap {
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.25), rgba(59, 130, 246, 0.18));
    transform: scale(1.07);
}

.tool-card-icon {
    font-size: 1.5rem;
    line-height: 1;
}

/* Text body */
.tool-card-body {
    flex: 1;
    position: relative;
    z-index: 1;
}

.tool-card-body h3 {
    font-size: var(--font-size-base);
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 8px;
    color: var(--text-primary);
    transition: color var(--transition-fast);
}

.explore-tool-card:hover .tool-card-body h3 {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tool-card-body p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    line-height: 1.65;
    margin: 0;
}

/* Arrow icon */
.tool-card-arrow {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    color: var(--purple-500);
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity var(--transition-base), transform var(--transition-base);
    position: relative;
    z-index: 1;
}

.explore-tool-card:hover .tool-card-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* Featured card (Face Slimmer Free) — subtle gradient border */
.explore-tool-card--featured {
    border-color: rgba(168, 85, 247, 0.22);
    background: linear-gradient(135deg, rgba(168, 85, 247, 0.07), rgba(59, 130, 246, 0.04));
}

.explore-tool-card--featured::after {
    content: 'FREE';
    position: absolute;
    top: 14px;
    right: 16px;
    font-size: 0.65rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: #22c55e;
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.25);
    padding: 3px 8px;
    border-radius: var(--radius-full);
}

.explore-tool-card--featured:hover {
    border-color: rgba(168, 85, 247, 0.5);
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.45), 0 0 30px rgba(168, 85, 247, 0.2);
}