/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --bg-card-hover: #22222e;
    
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a855f7 100%);
    
    --risk-low: #22c55e;
    --risk-medium: #eab308;
    --risk-high: #f97316;
    --risk-critical: #ef4444;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-color-hover: rgba(255, 255, 255, 0.15);
    
    /* Spacing */
    --nav-height: 70px;
    --container-max: 1200px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.3);
}

/* Light theme */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-card-hover: #f8fafc;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-color-hover: rgba(0, 0, 0, 0.15);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

/* ===== Utilities ===== */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

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

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

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

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

@keyframes scan {
    0% { top: 0; }
    100% { top: 100%; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

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

@keyframes glow {
    0%, 100% { opacity: 0.5; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

.animate-fade-in {
    animation: fadeIn 0.8s ease forwards;
}

.animate-fade-in-up {
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; opacity: 0; }
.delay-2 { animation-delay: 0.4s; opacity: 0; }
.delay-3 { animation-delay: 0.6s; opacity: 0; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    outline: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-color-hover);
}

.btn-lg {
    padding: 16px 32px;
    font-size: 16px;
}

/* ===== Demo Banner ===== */
.demo-banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: 8px 50px 8px 20px;
    background: linear-gradient(90deg, #f59e0b, #d97706);
    color: #000;
    font-size: 13px;
    text-align: center;
    z-index: 1001;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.demo-banner.hidden {
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
}

.demo-banner i {
    font-size: 16px;
}

.demo-banner strong {
    font-weight: 700;
}

.banner-close {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0,0,0,0.15);
    border: none;
    color: #000;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.banner-close:hover {
    background: rgba(0,0,0,0.25);
}

/* ===== Navigation ===== */
.navbar {
    position: fixed;
    top: 38px;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
}

[data-theme="light"] .navbar {
    background: rgba(248, 250, 252, 0.8);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--accent-gradient);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 20px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
}

.nav-btn {
    padding: 10px 20px;
    background: var(--accent-gradient);
    color: white !important;
    border-radius: 10px;
}

.theme-toggle {
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

/* ===== Hero Section ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--nav-height) + 100px) 24px 60px;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(120px);
    animation: glow 8s ease-in-out infinite;
}

.glow-1 {
    background: rgba(99, 102, 241, 0.15);
    top: -200px;
    left: -200px;
}

.glow-2 {
    background: rgba(139, 92, 246, 0.15);
    bottom: -200px;
    right: -200px;
    animation-delay: 4s;
}

.hero-content {
    max-width: 600px;
    text-align: center;
    z-index: 1;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 50px;
    font-size: 14px;
    color: var(--accent-primary);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: clamp(40px, 6vw, 64px);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
}

.hero-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
}

.stat {
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 32px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

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

/* Hero Visual */
.hero-visual {
    position: absolute;
    right: 5%;
    top: 50%;
    transform: translateY(-50%);
    z-index: 1;
}

.demo-card {
    width: 380px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    animation: float 6s ease-in-out infinite;
}

.demo-card-header {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
}

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

.demo-dot.red { background: #ef4444; }
.demo-dot.yellow { background: #eab308; }
.demo-dot.green { background: #22c55e; }

.demo-preview {
    padding: 20px;
}

.scan-animation {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 16px;
}

.demo-face {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.scan-line {
    position: absolute;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient);
    box-shadow: 0 0 20px rgba(99, 102, 241, 0.8);
    animation: scan 2s linear infinite;
}

.detection-boxes {
    position: absolute;
    inset: 0;
}

.detection-box {
    position: absolute;
    border: 2px solid var(--risk-high);
    border-radius: 4px;
    animation: pulse 1.5s ease-in-out infinite;
}

.detection-box.box-1 {
    top: 20%;
    left: 25%;
    width: 50%;
    height: 45%;
}

.detection-box.box-2 {
    top: 40%;
    left: 30%;
    width: 40%;
    height: 15%;
    animation-delay: 0.5s;
}

.demo-result {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.risk-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 16px;
    background: rgba(249, 115, 22, 0.1);
    border: 1px solid rgba(249, 115, 22, 0.2);
    border-radius: 12px;
    min-width: 80px;
}

.risk-indicator.high {
    background: rgba(249, 115, 22, 0.1);
    border-color: rgba(249, 115, 22, 0.2);
}

.risk-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--risk-high);
}

.risk-label {
    font-size: 11px;
    color: var(--text-muted);
    text-transform: uppercase;
}

.demo-signals {
    flex: 1;
}

.signal {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--bg-secondary);
    border-radius: 8px;
    font-size: 12px;
    margin-bottom: 8px;
}

.signal.high { color: var(--risk-high); }
.signal.medium { color: var(--risk-medium); }

/* ===== Features Section ===== */
.features {
    padding: 120px 0;
    background: var(--bg-secondary);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 40px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 32px;
    transition: all var(--transition-normal);
    position: relative;
}

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

.feature-card.featured {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-glow);
}

.featured-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 6px 16px;
    background: var(--accent-gradient);
    color: white;
    font-size: 12px;
    font-weight: 600;
    border-radius: 50px;
}

.feature-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.feature-icon.audio {
    background: rgba(34, 197, 94, 0.1);
    color: var(--risk-low);
}

.feature-icon.video {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
}

.feature-icon.image {
    background: rgba(249, 115, 22, 0.1);
    color: var(--risk-high);
}

.feature-icon.text {
    background: rgba(234, 179, 8, 0.1);
    color: var(--risk-medium);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card > p {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 20px;
}

.feature-list {
    list-style: none;
    margin-bottom: 20px;
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.feature-list i {
    color: var(--risk-low);
    font-size: 12px;
}

.feature-accuracy {
    display: flex;
    align-items: center;
    gap: 12px;
}

.accuracy-bar {
    flex: 1;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.accuracy-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 3px;
}

.feature-accuracy span {
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-primary);
}

/* ===== How It Works ===== */
.how-it-works {
    padding: 120px 0;
}

.steps {
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 20px;
}

.step {
    text-align: center;
    max-width: 280px;
}

.step-number {
    font-size: 48px;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 16px;
}

.step-icon {
    width: 80px;
    height: 80px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 32px;
    color: var(--accent-primary);
    margin: 0 auto 20px;
    transition: all var(--transition-normal);
}

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

.step h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

.step p {
    color: var(--text-secondary);
    font-size: 14px;
}

.step-connector {
    display: flex;
    align-items: center;
    margin-top: 80px;
    color: var(--text-muted);
}

.connector-line {
    width: 40px;
    height: 2px;
    background: var(--border-color);
}

/* ===== CTA Section ===== */
.cta {
    padding: 80px 0;
    background: var(--bg-secondary);
}

.cta-content {
    text-align: center;
    padding: 60px;
    background: var(--accent-gradient);
    border-radius: 24px;
    position: relative;
    overflow: hidden;
}

.cta-content::before {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content h2 {
    font-size: 36px;
    font-weight: 700;
    color: white;
    margin-bottom: 16px;
    position: relative;
}

.cta-content p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 32px;
    position: relative;
}

.cta-content .btn {
    position: relative;
    background: white;
    color: var(--accent-primary);
}

.cta-content .btn:hover {
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.3);
}

/* ===== Footer ===== */
.footer {
    padding: 60px 0 30px;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 40px;
}

.footer-brand {
    max-width: 300px;
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-column h4 {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 10px;
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 14px;
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .hero-visual {
        display: none;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero h1 {
        font-size: 36px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .stat-divider {
        width: 40px;
        height: 1px;
    }
    
    .steps {
        flex-direction: column;
        align-items: center;
    }
    
    .step-connector {
        transform: rotate(90deg);
        margin: 20px 0;
    }
    
    .footer-content {
        flex-direction: column;
        gap: 40px;
    }
    
    .footer-links {
        flex-wrap: wrap;
        gap: 40px;
    }
}