@import url('https://cdn.jsdelivr.net/gh/orioncactus/pretendard/dist/web/static/pretendard.css');

:root {
    /* Premium Dark Theme Core Colors */
    --bg-base: #0a0a0c;
    --bg-surface: rgba(22, 22, 26, 0.6);
    --bg-surface-hover: rgba(32, 32, 38, 0.8);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-tertiary: #71717a;
    
    /* Accents */
    --accent-primary: #3b82f6; /* Modern Blue */
    --accent-secondary: #8b5cf6; /* Modern Purple */
    --accent-glow: rgba(59, 130, 246, 0.2);
    
    /* Borders & Lines */
    --border-light: rgba(255, 255, 255, 0.08);
    --border-highlight: rgba(255, 255, 255, 0.15);
    
    /* Spacing & Layout */
    --max-width: 1200px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Background Ambient Glows */
body::before, body::after {
    content: '';
    position: fixed;
    width: 60vw;
    height: 60vw;
    border-radius: 50%;
    filter: blur(120px);
    z-index: -1;
    opacity: 0.4;
    pointer-events: none;
    animation: drift 20s infinite alternate ease-in-out;
}

body::before {
    top: -20vw;
    left: -20vw;
    background: radial-gradient(circle, var(--accent-primary), transparent 60%);
}

body::after {
    bottom: -20vw;
    right: -20vw;
    background: radial-gradient(circle, var(--accent-secondary), transparent 60%);
    animation-delay: -10s;
}

@keyframes drift {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(5%, 5%) scale(1.1); }
}

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

section {
    padding: 120px 0;
    position: relative;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(3rem, 6vw, 5rem);
    background: linear-gradient(135deg, #fff 0%, #a1a1aa 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 24px;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 48px;
    text-align: center;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
}

/* Glassmorphism Styles */
.glass-panel {
    background: var(--bg-surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    transition: var(--transition-smooth);
}

.glass-panel:hover {
    border-color: var(--border-highlight);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4), 0 0 40px var(--accent-glow);
}

/* Navigation */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    z-index: 100;
    transition: var(--transition-smooth);
}

nav.scrolled {
    background: rgba(10, 10, 12, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-light);
    padding: 16px 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    text-decoration: none;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo span {
    width: 12px;
    height: 12px;
    background: var(--accent-primary);
    border-radius: 50%;
    display: inline-block;
    box-shadow: 0 0 10px var(--accent-primary);
}

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

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), #2563eb);
    color: #fff;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.4);
}

.btn-secondary {
    background: var(--bg-surface);
    color: var(--text-primary);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(10px);
}

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

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin: 0 auto;
    max-width: 800px;
    z-index: 1;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 40px;
    max-width: 640px;
}

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

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 32px;
    gap: 8px;
}

.hero-badge .pulse {
    width: 8px;
    height: 8px;
    background: #10b981;
    border-radius: 50%;
    position: relative;
}

.hero-badge .pulse::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: inherit;
    border-radius: inherit;
    animation: pulse 2s ease-out infinite;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.8; }
    100% { transform: scale(3); opacity: 0; }
}

/* App Mockup / Visualizer */
.hero-visual {
    margin-top: 80px;
    width: 100%;
    max-width: 1000px;
    height: 500px;
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: flex-end;
}

.hero-visual::before {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 100px;
    background: var(--accent-primary);
    filter: blur(80px);
    opacity: 0.3;
    z-index: 0;
}

.mockup-layer {
    position: absolute;
    bottom: -20px;
    width: 60%;
    height: auto;
    border-radius: 20px 20px 0 0;
    border: 1px solid var(--border-highlight);
    border-bottom: none;
    background: linear-gradient(180deg, rgba(30, 30, 36, 0.9) 0%, rgba(15, 15, 18, 1) 100%);
    box-shadow: 0 -20px 40px rgba(0, 0, 0, 0.5);
    z-index: 1;
    display: flex;
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    backdrop-filter: blur(20px);
}

.mockup-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-light);
}

.mockup-title {
    font-size: 1.25rem;
    font-weight: 700;
}

.mockup-bar {
    height: 8px;
    background: var(--border-light);
    border-radius: 4px;
    width: 30%;
}

.mockup-item {
    height: 60px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    border: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 16px;
}

.mockup-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
}

.mockup-text {
    flex: 1;
    height: 8px;
    background: var(--border-light);
    border-radius: 4px;
}

.mockup-text.short {
    width: 40%;
    flex: none;
}

/* Features Section */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 64px;
}

.feature-card {
    padding: 40px 32px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-highlight);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    font-size: 24px;
    color: var(--accent-primary);
    transition: var(--transition-smooth);
}

.feature-card:hover .feature-icon {
    background: var(--accent-primary);
    color: #fff;
    transform: scale(1.1) rotate(5deg);
}

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

.feature-card p {
    font-size: 1rem;
    line-height: 1.5;
}

/* Info Section */
.info-section {
    position: relative;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.info-card {
    padding: 48px;
}

.info-card h3 {
    font-size: 1.75rem;
    margin-bottom: 16px;
}

/* Footer Element */
footer {
    border-top: 1px solid var(--border-light);
    padding: 48px 0;
    margin-top: 60px;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 24px;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: var(--transition-fast);
}

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

.copyright {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* Utilities for JS Animation */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.5, 0, 0, 1);
}

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

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.75rem; }
    .info-grid { grid-template-columns: 1fr; }
    .hero-visual { height: 300px; margin-top: 60px; }
    .mockup-layer { width: 90%; }
    .hero { min-height: auto; padding-top: 120px; padding-bottom: 60px; }
}