:root {
    --primary-color: #00bcd4;
    --primary-dark: #0097a7;
    --text-color: #333;
    --text-muted: #666;
    --bg-color: #ffffff;
    --bg-alt: #f4f7f6;
    --border-color: #eee;
    --nav-bg: #ffffff;
    --card-bg: #ffffff;
    --hero-start: #e0f7fa;
    --hero-end: #ffffff;
    --hero-title: #222;
    --shadow-color: rgba(0,0,0,0.05);
    --white: #ffffff;
}

[data-theme="dark"] {
    --primary-color: #4dd0e1;
    --primary-dark: #00acc1;
    --text-color: #e8eef2;
    --text-muted: #a7b4bd;
    --bg-color: #111827;
    --bg-alt: #172033;
    --border-color: #2f3b4f;
    --nav-bg: #0f172a;
    --card-bg: #172033;
    --hero-start: #102a43;
    --hero-end: #111827;
    --hero-title: #f8fafc;
    --shadow-color: rgba(0,0,0,0.28);
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Navbar */
.navbar {
    background: var(--nav-bg);
    height: 70px;
    display: flex;
    align-items: center;
    box-shadow: 0 2px 10px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 22px;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
}

.nav-menu li {
    margin-left: 30px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.theme-toggle {
    width: 42px;
    height: 42px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    background: var(--card-bg);
    color: var(--text-color);
    cursor: pointer;
    font-size: 1.15rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.theme-toggle:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

.language-link {
    min-width: 42px;
    height: 42px;
    padding: 0 12px;
    border: 1px solid var(--border-color);
    border-radius: 21px;
    color: var(--text-color);
    background: var(--card-bg);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    font-weight: 700;
    text-decoration: none;
    transition: border-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.language-link:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--hero-start) 0%, var(--hero-end) 100%);
    padding: 100px 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--hero-title);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 800px;
    margin: 0 auto 40px;
}

.cta-btn {
    display: inline-block;
    padding: 15px 40px;
    background-color: var(--primary-color);
    color: var(--white);
    text-decoration: none;
    border-radius: 30px;
    font-weight: 700;
    transition: background 0.3s;
}

.cta-btn:hover {
    background-color: var(--primary-dark);
}

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    text-align: center;
    font-size: 2.25rem;
    margin-bottom: 50px;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    margin: 15px auto;
}

/* Article Grid */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.article-card {
    background: var(--card-bg);
    padding: 30px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px var(--shadow-color);
}

.article-category {
    color: var(--primary-color);
    font-size: 0.85rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 15px;
}

.article-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    line-height: 1.4;
}

.article-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

.read-more {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 700;
}

/* Footer */
.footer {
    background: #0f172a;
    color: #eee;
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: var(--white);
}

.footer ul {
    list-style: none;
}

.footer ul li {
    margin-bottom: 10px;
}

.footer a {
    color: #bbb;
    text-decoration: none;
}

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

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 30px;
    text-align: center;
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.25rem; }
    .nav-container { gap: 14px; }
    .nav-menu { display: none; } /* Mobile menu simplified for now */
    .nav-actions { gap: 8px; }
}