/* ===================================
   MEDICHIPS Homepage - Dark Futuristic Theme
   =================================== */

/* CSS Variables */
:root {
    --bg-primary: #000008;
    --bg-secondary: #050510;
    --bg-card: rgba(10, 10, 30, 0.8);
    --bg-glass: rgba(20, 20, 50, 0.6);

    --cyan: #00aaff;
    --cyan-glow: #00ffff;
    --purple: #8855ff;
    --purple-glow: #aa66ff;
    --pink: #ff3388;
    --blue: #0066ff;

    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);

    --border-glow: rgba(0, 170, 255, 0.3);
    --border-subtle: rgba(255, 255, 255, 0.1);

    --gradient-cyan: linear-gradient(135deg, #00aaff 0%, #00ffff 100%);
    --gradient-purple: linear-gradient(135deg, #8855ff 0%, #aa66ff 100%);
    --gradient-mixed: linear-gradient(135deg, #00aaff 0%, #8855ff 50%, #aa66ff 100%);
    --gradient-bg: radial-gradient(ellipse at top, #0a0a2a 0%, #000008 50%, #000000 100%);

    --shadow-glow-cyan: 0 0 30px rgba(0, 170, 255, 0.3);
    --shadow-glow-purple: 0 0 30px rgba(136, 85, 255, 0.3);
    --shadow-lg: 0 20px 40px rgba(0, 0, 0, 0.5);

    --radius: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    --transition: all 0.3s ease;
    --transition-slow: all 0.5s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

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

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

ul {
    list-style: none;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.3;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--gradient-mixed);
    color: var(--text-primary);
    box-shadow: var(--shadow-glow-cyan);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(0, 170, 255, 0.5);
}

.btn-secondary {
    background: transparent;
    color: var(--cyan);
    border: 2px solid var(--cyan);
}

.btn-secondary:hover {
    background: rgba(0, 170, 255, 0.1);
    box-shadow: var(--shadow-glow-cyan);
}

.btn-white {
    background: var(--text-primary);
    color: var(--bg-primary);
    box-shadow: var(--shadow-lg);
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 40px rgba(255, 255, 255, 0.3);
}

.btn-outline-white {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--text-primary);
}

.btn-full {
    width: 100%;
}

/* Section Styles */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    background: rgba(0, 170, 255, 0.1);
    color: var(--cyan);
    padding: 6px 16px;
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 16px;
    border: 1px solid rgba(0, 170, 255, 0.3);
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff 0%, var(--cyan) 50%, var(--purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-desc {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(0, 0, 8, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-subtle);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(0, 0, 8, 0.95);
    box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-text .letter {
    display: inline-block;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}

.logo-text .letter:hover {
    color: var(--cyan);
    text-shadow: 0 0 10px var(--cyan), 0 0 20px var(--cyan), 0 0 30px var(--cyan);
}

.logo-img {
    width: 27px;
    height: 27px;
    object-fit: contain;
}

.heartbeat {
    animation: heartbeat 1.5s ease-in-out infinite;
}

@keyframes heartbeat {
    0% { transform: scale(1); }
    14% { transform: scale(1.15); }
    28% { transform: scale(1); }
    42% { transform: scale(1.12); }
    70% { transform: scale(1); }
}

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

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-cyan);
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--cyan);
}

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

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

.btn-nav::after {
    display: none;
}

.btn-nav:hover {
    opacity: 0.9;
    box-shadow: var(--shadow-glow-cyan);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(0, 0, 8, 0.95);
    backdrop-filter: blur(20px);
    padding: 20px;
    box-shadow: var(--shadow-lg);
    z-index: 999;
    border-bottom: 1px solid var(--border-subtle);
}

.mobile-menu.active {
    display: block;
}

.mobile-menu ul {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.mobile-menu a {
    display: block;
    padding: 12px 16px;
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius);
}

.mobile-menu a:hover {
    background: rgba(0, 170, 255, 0.1);
    color: var(--cyan);
}

/* ===================================
   Hero Section with Three.js
   =================================== */
.hero {
    position: relative;
    height: 100vh;
    height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--bg-primary);
    clip-path: inset(0);
    -webkit-clip-path: inset(0);
}

#three-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    touch-action: pan-y;
    -webkit-transform: translateZ(0);
    transform: translateZ(0);
    pointer-events: none;
}

#three-container canvas {
    display: block;
    max-height: 100%;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 20px;
    pointer-events: none;
    user-select: none;
    -webkit-user-select: none;
}

.hero-content * {
    outline: none;
    border: none;
    caret-color: transparent;
}

.hero-title {
    font-size: 4rem;
    font-weight: 200;
    letter-spacing: 0.4em;
    margin-bottom: 0.5rem;
    color: rgba(255, 255, 255, 0.9);
    text-transform: uppercase;
    margin-left: 0.4em; /* letter-spacing 보정 */
}

.hero-subtitle {
    font-size: 0.9rem;
    font-weight: 300;
    letter-spacing: 0.3em;
    color: rgba(255, 255, 255, 0.5);
    text-transform: uppercase;
    margin-left: 0.3em; /* letter-spacing 보정 */
}

/* ===================================
   Intro Section (Below Hero)
   =================================== */
.intro {
    padding: 80px 0;
    background: var(--bg-primary);
    text-align: center;
    position: relative;
}

.intro::after {
    content: '';
    position: absolute;
    top: -30px;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 33px;
    background: linear-gradient(to bottom,
        transparent 0%,
        var(--cyan-glow) 20%,
        var(--cyan) 50%,
        rgba(0, 170, 255, 0.3) 80%,
        rgba(0, 170, 255, 0.1) 100%
    );
    box-shadow: 0 0 8px var(--cyan), 0 0 15px var(--cyan);
    border-radius: 2px;
    animation: lightFlow 2s ease-out infinite;
}

@keyframes lightFlow {
    0% {
        top: -30px;
        height: 33px;
        opacity: 1;
    }
    100% {
        top: -30px;
        height: 180px;
        opacity: 0;
    }
}

.intro-desc {
    font-size: 1.5rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
    padding-top: 40px;
}

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

.intro-stats {
    display: flex;
    gap: 60px;
    justify-content: center;
    padding: 30px;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    max-width: 600px;
    margin: 0 auto;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    background: var(--gradient-cyan);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    z-index: 2;
    outline: none;
    border: none;
}

.scroll-indicator span,
.scroll-indicator div {
    outline: none;
    border: none;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border: none;
    border-right: 2px solid var(--cyan);
    border-bottom: 2px solid var(--cyan);
    transform: rotate(45deg);
    margin: 8px auto 0;
    animation: bounce 2s infinite;
    opacity: 0.7;
    outline: none;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0) rotate(45deg);
    }
    40% {
        transform: translateY(10px) rotate(45deg);
    }
    60% {
        transform: translateY(5px) rotate(45deg);
    }
}

/* ===================================
   Features Section
   =================================== */
.features {
    padding: 100px 0;
    background: var(--gradient-bg);
    position: relative;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-mixed);
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--border-glow);
    transform: translateY(-5px);
    box-shadow: var(--shadow-glow-cyan);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    background: var(--gradient-mixed);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: var(--text-primary);
    box-shadow: var(--shadow-glow-cyan);
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.9375rem;
}

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

.feature-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.feature-list li::before {
    content: '✓';
    color: var(--cyan);
    font-weight: 700;
}

/* ===================================
   How It Works Section
   =================================== */
.how-it-works {
    padding: 100px 0;
    background: var(--bg-secondary);
    position: relative;
}

.ai-architecture {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    margin-bottom: 80px;
}

.ai-card {
    flex: 1;
    max-width: 350px;
    padding: 32px;
    border-radius: var(--radius-lg);
    position: relative;
    backdrop-filter: blur(10px);
}

.ai-card.cloud {
    background: linear-gradient(135deg, rgba(0, 102, 255, 0.1) 0%, rgba(0, 170, 255, 0.1) 100%);
    border: 1px solid rgba(0, 170, 255, 0.3);
}

.ai-card.local {
    background: linear-gradient(135deg, rgba(136, 85, 255, 0.1) 0%, rgba(170, 102, 255, 0.1) 100%);
    border: 1px solid rgba(136, 85, 255, 0.3);
}

.ai-badge {
    position: absolute;
    top: -12px;
    left: 24px;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-primary);
}

.ai-card.cloud .ai-badge {
    background: var(--gradient-cyan);
}

.ai-card.local .ai-badge {
    background: var(--gradient-purple);
}

.ai-card h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.ai-card p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 0.9375rem;
}

.ai-card ul {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ai-card li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding-left: 20px;
    position: relative;
}

.ai-card li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--cyan);
}

.ai-router {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-subtle);
    backdrop-filter: blur(10px);
}

.router-icon {
    color: var(--cyan);
}

.ai-router span {
    font-weight: 600;
    color: var(--text-primary);
}

.ai-router p {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

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

.step {
    flex: 1;
    max-width: 200px;
    text-align: center;
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--gradient-mixed);
    color: var(--text-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: 700;
    margin: 0 auto 16px;
    box-shadow: var(--shadow-glow-cyan);
}

.step h4 {
    font-size: 1rem;
    margin-bottom: 8px;
}

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

/* ===================================
   Privacy Section
   =================================== */
.privacy {
    padding: 100px 0;
    background: var(--bg-primary);
    position: relative;
}

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

.privacy-content {
    max-width: 800px;
    margin: 0 auto;
}

.privacy-text .section-tag {
    background: rgba(136, 85, 255, 0.1);
    color: var(--purple);
    border-color: rgba(136, 85, 255, 0.3);
}

.privacy-text > p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 1.125rem;
}

.privacy-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.privacy-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    padding: 24px;
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border-subtle);
    transition: var(--transition);
}

.privacy-item:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow-purple);
}

.privacy-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border: 1px solid var(--purple);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--purple);
}

.privacy-item h4 {
    color: var(--text-primary);
    margin-bottom: 4px;
    font-size: 1rem;
}

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

/* ===================================
   About Section
   =================================== */
.about {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: var(--transition);
}

.about-card:hover {
    border-color: var(--border-glow);
    box-shadow: var(--shadow-glow-cyan);
}

.about-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    background: var(--bg-glass);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--cyan);
    border: 1px solid var(--border-subtle);
}

.about-card h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.company-info {
    display: flex;
    justify-content: center;
    gap: 60px;
    padding: 40px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
}

.info-item {
    text-align: center;
}

.info-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.info-value {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--cyan);
}

/* ===================================
   CTA Section
   =================================== */
.cta {
    padding: 100px 0;
    background: transparent;
    text-align: center;
    position: relative;
    overflow: visible;
}

.cta::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 100%;
    background: radial-gradient(ellipse at center,
        rgba(0, 170, 255, 0.15) 0%,
        rgba(136, 85, 255, 0.2) 30%,
        rgba(136, 85, 255, 0.1) 50%,
        transparent 70%
    );
    filter: blur(40px);
    z-index: -1;
    animation: glowWave 6s ease-in-out infinite;
}

@keyframes glowWave {
    0% {
        transform: translate(calc(-50% + 0px), calc(-50% + 0px)) scale(1);
        opacity: 1;
    }
    10% {
        transform: translate(calc(-50% + 3px), calc(-50% - 2px)) scale(1.01);
        opacity: 0.95;
    }
    20% {
        transform: translate(calc(-50% + 5px), calc(-50% + 1px)) scale(1.02);
        opacity: 0.92;
    }
    30% {
        transform: translate(calc(-50% + 2px), calc(-50% + 4px)) scale(1.01);
        opacity: 0.97;
    }
    40% {
        transform: translate(calc(-50% - 2px), calc(-50% + 3px)) scale(0.99);
        opacity: 1.02;
    }
    50% {
        transform: translate(calc(-50% - 4px), calc(-50% + 0px)) scale(0.98);
        opacity: 1;
    }
    60% {
        transform: translate(calc(-50% - 3px), calc(-50% - 3px)) scale(0.99);
        opacity: 0.94;
    }
    70% {
        transform: translate(calc(-50% - 1px), calc(-50% - 4px)) scale(1.01);
        opacity: 0.98;
    }
    80% {
        transform: translate(calc(-50% + 2px), calc(-50% - 2px)) scale(1.02);
        opacity: 0.96;
    }
    90% {
        transform: translate(calc(-50% + 1px), calc(-50% + 1px)) scale(1.01);
        opacity: 0.99;
    }
    100% {
        transform: translate(calc(-50% + 0px), calc(-50% + 0px)) scale(1);
        opacity: 1;
    }
}

.cta-content {
    position: relative;
    z-index: 2;
}

.cta-content h2 {
    color: var(--text-primary);
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* ===================================
   Contact Section
   =================================== */
.contact {
    padding: 100px 0;
    background: var(--bg-primary);
}

.contact-grid {
    display: flex;
    justify-content: center;
    max-width: 600px;
    margin: 0 auto;
}

.contact-form {
    background: var(--bg-card);
    padding: 40px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-subtle);
    width: 100%;
    backdrop-filter: blur(10px);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    transition: var(--transition);
    background: rgba(0, 0, 0, 0.3);
    color: var(--text-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 0 3px rgba(0, 170, 255, 0.1);
}

.form-group select {
    cursor: pointer;
}

.form-group select option {
    background: var(--bg-primary);
    color: var(--text-primary);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-secondary);
    color: var(--text-muted);
    padding: 60px 0 0;
    border-top: 1px solid var(--border-subtle);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--border-subtle);
}

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

.footer-logo-img {
    width: 26px;
    height: 26px;
    object-fit: contain;
}

.footer-brand .logo-text {
    color: var(--text-primary);
}

.footer-brand > p {
    margin-bottom: 20px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.footer-column h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 20px;
}

.footer-column ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-column a {
    color: var(--text-muted);
    font-size: 0.9375rem;
    transition: var(--transition);
}

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

.footer-bottom {
    padding: 24px 0;
    text-align: center;
    font-size: 0.875rem;
}

.footer-note {
    margin-top: 8px;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
        letter-spacing: 0.2em;
    }

    .hero-stats {
        gap: 40px;
        flex-wrap: wrap;
    }

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

    .ai-architecture {
        flex-direction: column;
    }

    .ai-card {
        max-width: 100%;
    }

    .workflow-steps {
        flex-wrap: wrap;
    }

    .privacy-features {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
    }

    .company-info {
        flex-wrap: wrap;
        gap: 30px;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        height: 100vh;
        height: 100svh;
        -webkit-transform: translateZ(0);
        transform: translateZ(0);
        -webkit-backface-visibility: hidden;
        backface-visibility: hidden;
    }

    #three-container {
        -webkit-transform: translateZ(0);
        transform: translateZ(0);
        overflow: hidden;
    }

    #three-container canvas {
        -webkit-transform: translateZ(0);
        transform: translateZ(0);
    }

    .hero-title {
        font-size: 2rem;
        letter-spacing: 0.15em;
    }

    .hero-subtitle {
        font-size: 0.75rem;
    }

    .intro-desc {
        font-size: 1.125rem;
    }

    .intro-buttons {
        flex-direction: column;
        align-items: center;
    }

    .intro-stats {
        flex-direction: row;
        flex-wrap: nowrap;
        gap: 16px;
        justify-content: center;
        padding: 20px 15px;
    }

    .intro-stats .stat {
        min-width: auto;
        flex: 1;
    }

    .intro-stats .stat-number {
        font-size: 1.4rem;
    }

    .intro-stats .stat-label {
        font-size: 0.75rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .footer-column {
        text-align: center;
    }

    .footer-column h4 {
        margin-bottom: 12px;
        font-size: 0.9rem;
    }

    .footer-column ul {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        gap: 8px 16px;
    }

    .footer-column a {
        font-size: 0.875rem;
    }

    .company-info {
        flex-direction: column;
        gap: 20px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 1.75rem;
        letter-spacing: 0.1em;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .btn {
        padding: 12px 20px;
        font-size: 0.9375rem;
    }

    .contact-form {
        padding: 24px;
    }
}

/* ===================================
   Pre-registration Form Styles
   =================================== */
.preregister-form {
    max-width: 500px;
    margin: 0 auto;
}

.preregister-input-group {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
}

.preregister-input-group input[type="email"] {
    flex: 1;
    padding: 16px 20px;
    border-radius: var(--radius);
    border: 1px solid var(--border-glow);
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.preregister-input-group input[type="email"]:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 20px rgba(0, 170, 255, 0.3);
}

.preregister-input-group input[type="email"]::placeholder {
    color: var(--text-muted);
}

.preregister-note {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-align: center;
}

.btn-white {
    background: white;
    color: var(--bg-primary);
    padding: 16px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn-white:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(255, 255, 255, 0.2);
}

.btn-white svg {
    stroke: var(--bg-primary);
}

@media (max-width: 480px) {
    .preregister-input-group {
        flex-direction: row;
    }

    .preregister-input-group input[type="email"] {
        flex: 1;
        min-width: 0;
    }

    .preregister-input-group .btn-white {
        width: auto;
        padding: 16px;
        flex-shrink: 0;
    }

    .preregister-input-group .btn-white .btn-text {
        display: none;
    }
}

/* ===================================
   Feature Card Preview Hint
   =================================== */
.feature-card {
    cursor: pointer;
    position: relative;
}

.feature-preview-hint {
    display: block;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-subtle);
    font-size: 0.8125rem;
    color: var(--cyan);
    opacity: 0.7;
    transition: var(--transition);
}

.feature-card:hover .feature-preview-hint {
    opacity: 1;
}

/* ===================================
   Feature Preview Modal
   =================================== */
.feature-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.feature-modal.active {
    opacity: 1;
    visibility: visible;
}

.feature-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    cursor: pointer;
}

.feature-modal-content {
    position: relative;
    z-index: 1;
    max-width: 400px;
    max-height: 90vh;
    padding: 24px;
    transform: scale(0.9);
    transition: var(--transition);
}

.feature-modal.active .feature-modal-content {
    transform: scale(1);
}

.feature-modal-close {
    position: absolute;
    top: -40px;
    right: 0;
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--border-glow);
    border-radius: 50%;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.feature-modal-close:hover {
    background: var(--cyan);
    border-color: var(--cyan);
}

.feature-modal-image-container {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-glow);
    overflow: hidden;
    box-shadow: var(--shadow-glow-cyan);
}

.feature-modal-image-container img {
    display: block;
    width: 100%;
    height: auto;
    max-height: 70vh;
    object-fit: contain;
}

.feature-modal-title {
    text-align: center;
    margin-top: 20px;
    font-size: 1.25rem;
    color: var(--text-primary);
}

/* ===================================
   Admin Modal
   =================================== */
.admin-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10001;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.admin-modal.active {
    opacity: 1;
    visibility: visible;
}

.admin-modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    cursor: pointer;
}

.admin-modal-content {
    position: relative;
    z-index: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: var(--radius-lg);
    padding: 40px;
    max-width: 400px;
    width: 90%;
    transform: scale(0.9);
    transition: var(--transition);
}

.admin-modal.active .admin-modal-content {
    transform: scale(1);
}

.admin-modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 32px;
    height: 32px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    border-radius: 50%;
    color: var(--text-secondary);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.admin-modal-close:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.admin-modal-content h3 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.5rem;
}

.admin-form-group {
    margin-bottom: 20px;
}

.admin-form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.admin-form-group input {
    width: 100%;
    padding: 14px 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border-subtle);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.admin-form-group input:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: 0 0 15px rgba(0, 170, 255, 0.2);
}

.admin-error {
    text-align: center;
    color: #ff4444;
    margin-top: 16px;
    font-size: 0.875rem;
}

#footerLogo {
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

/* ===================================
   Background Music Controller
   =================================== */
.music-controller {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 9999;
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--bg-card);
    border: 1px solid var(--border-glow);
    border-radius: 50px;
    padding: 8px 16px 8px 8px;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-glow-cyan);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(20px);
}

.music-controller.visible {
    opacity: 1;
    transform: translateY(0);
}

.music-controller:hover {
    box-shadow: 0 0 40px rgba(0, 170, 255, 0.5);
}

.music-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-cyan);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition);
    position: relative;
}

.music-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 0 20px rgba(0, 170, 255, 0.6);
}

.music-btn.muted {
    background: var(--bg-glass);
    border: 1px solid var(--border-subtle);
}

.music-btn.muted:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Music icon visibility - controlled by .muted class only */
.music-icon-on, .music-icon-off {
    transition: var(--transition);
}

/* Default state (playing): show on icon, hide off icon */
.music-btn .music-icon-on {
    display: block;
}

.music-btn .music-icon-off {
    display: none;
}

/* Muted state: show off icon, hide on icon */
.music-btn.muted .music-icon-on {
    display: none;
}

.music-btn.muted .music-icon-off {
    display: block;
}

.music-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--cyan);
    letter-spacing: 0.05em;
    white-space: nowrap;
}

.music-btn.muted + .music-label {
    color: var(--text-muted);
}

/* Music controller pulse animation when playing */
@keyframes musicPulse {
    0%, 100% { box-shadow: var(--shadow-glow-cyan); }
    50% { box-shadow: 0 0 50px rgba(0, 170, 255, 0.6); }
}

.music-controller.playing {
    animation: musicPulse 2s ease-in-out infinite;
}

/* Mobile Music Button (in navbar) */
.mobile-music-btn {
    display: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: transparent;
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.5);
    transition: var(--transition);
    margin-right: 8px;
}

.mobile-music-btn:hover {
    background: rgba(0, 170, 255, 0.1);
}

.mobile-music-btn.playing {
    background: transparent;
    color: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--border-subtle);
}

.mobile-music-btn.muted {
    color: var(--text-muted);
    border-color: var(--border-subtle);
}

/* Mobile music button icon visibility - controlled by .muted class only */
.mobile-music-btn .music-icon-on,
.mobile-music-btn .music-icon-off {
    transition: var(--transition);
}

/* Default state (playing): show on icon, hide off icon */
.mobile-music-btn .music-icon-on {
    display: block;
}

.mobile-music-btn .music-icon-off {
    display: none;
}

/* Muted state: show off icon, hide on icon */
.mobile-music-btn.muted .music-icon-on {
    display: none;
}

.mobile-music-btn.muted .music-icon-off {
    display: block;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    /* Hide floating controller on mobile */
    .music-controller {
        display: none !important;
    }

    /* Show mobile music button in navbar */
    .mobile-music-btn {
        display: flex;
    }
}