/* Global Design System - Premium Dark Theme */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+KR:wght@300;400;600;700&family=Pretendard:wght@300;400;500;600;700&display=swap');

:root {
    /* Colors */
    --primary-color: #0f172a; /* Deep Midnight Blue */
    --secondary-color: #1e293b; /* Darker Slate */
    --accent-color: #d4af37; /* Gold */
    --accent-glow: rgba(212, 175, 55, 0.4);
    --text-color: #f8fafc; /* Soft White */
    --text-muted: #94a3b8; /* Slate Gray */
    --bg-color: #020617; /* Very Dark Blue/Black */
    --card-bg: rgba(30, 41, 59, 0.7); /* Glassmorphism */
    --border-color: rgba(212, 175, 55, 0.2);
    
    /* Typography */
    --font-serif: 'Noto Serif KR', serif;
    --font-sans: 'Pretendard', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    
    /* Effects */
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--accent-glow);
    --radius-md: 12px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* Background Animation */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 15% 50%, rgba(212, 175, 55, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(79, 70, 229, 0.05) 0%, transparent 25%);
    z-index: -1;
    pointer-events: none;
}

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

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(255, 255, 255, 0.1);
}

h2 {
    font-size: 2.25rem;
    margin-bottom: var(--spacing-md);
    color: var(--accent-color);
}

p {
    margin-bottom: 1rem;
    color: var(--text-muted);
}

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

a:hover {
    color: #ffd700;
    text-shadow: 0 0 10px var(--accent-glow);
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-submit, .btn-learn-more {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-family: var(--font-sans);
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    gap: 0.5rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, #b8860b 100%);
    color: #000;
    box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px var(--accent-glow);
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--accent-color);
    color: var(--accent-color);
}

.btn-secondary:hover {
    background: rgba(212, 175, 55, 0.1);
    transform: translateY(-2px);
}

/* Header / Hero Section */
.header {
    text-align: center;
    padding: 6rem 1rem;
    position: relative;
    overflow: hidden;
}

.header.minimal {
    padding: 4rem 1rem;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.description {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 1.5rem auto;
    color: var(--text-color);
}

.header-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-top: 2rem;
    animation: float 3s ease-in-out infinite;
}

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

/* Header Buttons */
.header-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 3rem;
    flex-wrap: wrap;
}

/* Navigation Buttons (Back/Home) */
.nav-buttons {
    position: absolute;
    top: 20px;
    left: 20px;
    display: flex;
    gap: 10px;
    z-index: 100;
}

.nav-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    backdrop-filter: blur(5px);
}

.nav-btn:hover {
    background: var(--accent-color);
    color: #000;
    transform: rotate(360deg);
}

/* Cards & Sections */
.features, .highlights-grid, .about-grid, .testimonials-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding: var(--spacing-lg) 5%;
    max-width: 1400px;
    margin: 0 auto;
}

.feature-box, .highlight-card, .about-card, .testimonial-card {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-box::before, .highlight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent-color), transparent);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-box:hover, .highlight-card:hover, .about-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md), var(--shadow-glow);
    border-color: var(--accent-color);
}

.feature-box:hover::before, .highlight-card:hover::before {
    transform: scaleX(1);
}

.feature-box i, .highlight-card i, .about-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1.5rem;
}

/* Quick Menu */
.quick-menu {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    padding: 2rem;
    background: rgba(15, 23, 42, 0.5);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.menu-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    padding: 1rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.menu-item:hover {
    background: rgba(255, 255, 255, 0.05);
}

.menu-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.5rem;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.menu-item:hover .menu-icon {
    transform: scale(1.1) rotate(10deg);
    border-color: var(--accent-color);
}

.menu-icon i {
    font-size: 1.5rem;
    color: var(--text-color);
}

/* Footer */
.footer {
    text-align: center;
    padding: 3rem;
    background: var(--primary-color);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.social-links {
    margin-top: 1.5rem;
    display: flex;
    justify-content: center;
    gap: 1.5rem;
}

.social-links a {
    color: var(--text-color);
    font-size: 1.5rem;
}

.social-links a:hover {
    color: var(--accent-color);
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 1.75rem; }
    .header { padding: 4rem 1rem; }
    .header-buttons { flex-direction: column; }
    .btn-primary, .btn-secondary { width: 100%; }
}