:root {
    --bg-dark: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-green: #10b981; /* Emerald */
    --accent-gold: #fcd34d; /* Bright Yellow */
    --card-bg: rgba(30, 41, 59, 0.7);
    --card-border: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background */
.background-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: 
        radial-gradient(circle at 15% 50%, rgba(16, 185, 129, 0.15), transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(252, 211, 77, 0.15), transparent 50%);
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    border-bottom: 1px solid var(--card-border);
    background: rgba(15, 23, 18, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.logo {
    font-family: 'Noto Serif KR', serif;
    font-size: 1.5rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    letter-spacing: 1px;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

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

/* Hero Section */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 4rem 5%;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.hero {
    text-align: center;
    margin-bottom: 5rem;
}

.hero h1 {
    font-family: 'Noto Serif KR', serif;
    font-size: clamp(2.5rem, 5vw, 4rem);
    line-height: 1.3;
    margin-bottom: 1.5rem;
}

.accent-text {
    color: var(--accent-green);
}

.hero p {
    color: var(--text-muted);
    font-size: clamp(1rem, 2vw, 1.2rem);
    line-height: 1.6;
}

/* Cards Container */
.cards-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    width: 100%;
}

.glass-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 3rem 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: transform 0.3s ease, border-color 0.3s ease;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.glass-card:hover {
    transform: translateY(-8px);
    border-color: rgba(16, 185, 129, 0.3);
}

.primary-card {
    background: linear-gradient(180deg, rgba(16, 185, 129, 0.1) 0%, var(--card-bg) 100%);
    border-color: rgba(16, 185, 129, 0.4);
}

.card-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
}

.glass-card h2 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    font-family: 'Noto Serif KR', serif;
}

.glass-card p {
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 2rem;
    flex: 1;
}

/* Buttons */
.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
    font-family: inherit;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--text-muted);
    color: var(--text-main);
}

.btn-outline:hover {
    border-color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.btn-filled {
    background: var(--accent-green);
    border: none;
    color: #000;
}

.btn-filled:hover {
    background: #0ea5e9;
    color: #fff;
    box-shadow: 0 4px 15px rgba(16, 185, 129, 0.4);
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer strong {
    color: var(--accent-green);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}