/* ===== CSS Variables ===== */
:root {
    --primary: #1a56db;
    --primary-dark: #1e429f;
    --secondary: #0e9f6e;
    --danger: #e02424;
    --bg: #f9fafb;
    --surface: #ffffff;
    --border: #e5e7eb;
    --text: #111827;
    --text-muted: #6b7280;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
}

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

body {
    font-family: 'Noto Sans KR', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 16px;
}

/* ===== Header ===== */
.site-header {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
    white-space: nowrap;
}

.main-nav {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.main-nav a {
    color: var(--text);
    text-decoration: none;
    padding: 6px 12px;
    border-radius: var(--radius);
    font-size: 0.9rem;
    transition: background 0.2s;
}

.main-nav a:hover {
    background: var(--bg);
    color: var(--primary);
}

/* ===== Ad Containers ===== */
.ad-container {
    text-align: center;
    margin: 16px 0;
}

.ad-placeholder {
    background: #f3f4f6;
    border: 1px dashed #d1d5db;
    color: #9ca3af;
    padding: 20px;
    border-radius: var(--radius);
    font-size: 0.8rem;
}

.ad-placeholder--sidebar {
    min-height: 250px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== Main Content ===== */
.main-content {
    padding: 24px 0;
    min-height: calc(100vh - 160px);
}

/* ===== Hero Section ===== */
.hero-section {
    text-align: center;
    padding: 32px 0;
}

.hero-section h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.hero-subtitle {
    color: var(--text-muted);
    margin-bottom: 24px;
}

.market-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.market-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-decoration: none;
    color: var(--text);
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: box-shadow 0.2s, transform 0.2s;
}

.market-card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    transform: translateY(-2px);
}

.market-card__icon { font-size: 1.5rem; }
.market-card__label { font-size: 0.85rem; color: var(--text-muted); }
.market-card__value { font-size: 1.1rem; font-weight: 700; color: var(--primary); }

/* ===== Posts Grid ===== */
.posts-section { margin-top: 32px; }

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.section-header h2 { font-size: 1.25rem; }
.see-all { color: var(--primary); text-decoration: none; font-size: 0.9rem; }

.posts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
}

.post-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: box-shadow 0.2s;
}

.post-card:hover { box-shadow: var(--shadow); }

.post-card a {
    display: block;
    padding: 20px;
    text-decoration: none;
    color: var(--text);
}

.post-card__category {
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 500;
    margin-bottom: 8px;
    display: block;
}

.post-card__title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
}

.post-card__excerpt {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.post-card__meta {
    font-size: 0.75rem;
    color: var(--text-muted);
    display: flex;
    gap: 12px;
}

/* ===== Category Grid ===== */
.category-section { margin-top: 32px; }
.category-section h2 { margin-bottom: 16px; }

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
    gap: 12px;
}

.category-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    text-decoration: none;
    color: var(--text);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.category-card:hover { background: #eff6ff; color: var(--primary); }
.category-card span:first-child { font-size: 1.5rem; }

/* ===== Detail Layout ===== */
.detail-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 24px;
    align-items: start;
}

@media (max-width: 768px) {
    .detail-layout { grid-template-columns: 1fr; }
    .sidebar { display: none; }
}

/* ===== Post Content ===== */
.post-header { margin-bottom: 24px; }
.post-category {
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 600;
    display: block;
    margin-bottom: 8px;
}

.post-header h1 { font-size: 1.75rem; margin-bottom: 12px; }

.post-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    gap: 16px;
}

.post-body {
    background: var(--surface);
    padding: 24px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    line-height: 1.8;
}

.post-body h2 { font-size: 1.3rem; margin: 24px 0 12px; }
.post-body h3 { font-size: 1.1rem; margin: 20px 0 8px; }
.post-body p { margin-bottom: 16px; }

/* ===== Sidebar ===== */
.sidebar { display: flex; flex-direction: column; gap: 16px; }

.sidebar-widget {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
}

.sidebar-widget h4 { font-size: 0.9rem; margin-bottom: 12px; color: var(--text-muted); }
.sidebar-widget ul { list-style: none; }
.sidebar-widget li { margin-bottom: 8px; }
.sidebar-widget a { color: var(--text); text-decoration: none; font-size: 0.9rem; }
.sidebar-widget a:hover { color: var(--primary); }

/* ===== Exchange Cards ===== */
.exchange-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin: 24px 0;
}

.exchange-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    text-align: center;
}

.exchange-card__currency { font-size: 1rem; font-weight: 700; color: var(--primary); }
.exchange-card__name { font-size: 0.8rem; color: var(--text-muted); margin: 4px 0; }
.exchange-card__rate { font-size: 1.5rem; font-weight: 700; margin: 8px 0; }
.exchange-card__label { font-size: 0.75rem; color: var(--text-muted); }

/* ===== Calculator ===== */
.tool-layout { max-width: 600px; margin: 0 auto; }
.tool-layout h1 { margin-bottom: 8px; }

.calculator-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
    margin: 24px 0;
}

.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 500; margin-bottom: 6px; }
.form-group input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
}

.calc-btn {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 8px;
}

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

.calc-result {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.result-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-top: 12px;
}

.result-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.result-item span { font-size: 0.8rem; color: var(--text-muted); }
.result-item strong { font-size: 1.1rem; }

/* ===== Related Posts ===== */
.related-posts { margin-top: 32px; }
.related-posts h3 { margin-bottom: 16px; }

.related-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 12px;
}

.related-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    text-decoration: none;
    color: var(--text);
    font-size: 0.9rem;
}

.related-card:hover { background: #eff6ff; }
.related-card__category { font-size: 0.75rem; color: var(--primary); display: block; margin-bottom: 4px; }

/* ===== Footer ===== */
.site-footer {
    background: var(--surface);
    border-top: 1px solid var(--border);
    padding: 24px 0;
    margin-top: 40px;
}

.footer-links {
    display: flex;
    gap: 16px;
    margin-bottom: 12px;
}

.footer-links a { color: var(--text-muted); text-decoration: none; font-size: 0.9rem; }
.footer-links a:hover { color: var(--primary); }

.footer-disclaimer {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.footer-copy { font-size: 0.8rem; color: var(--text-muted); }

/* ===== Misc ===== */
.empty-state {
    text-align: center;
    padding: 48px;
    color: var(--text-muted);
}

.related-education { margin-top: 24px; }
.related-education h3 { margin-bottom: 12px; }
.related-links { display: flex; flex-direction: column; gap: 8px; }
.related-links a { color: var(--primary); text-decoration: none; font-size: 0.9rem; }

.category-tabs {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.tab {
    padding: 6px 16px;
    border: 1px solid var(--border);
    border-radius: 20px;
    text-decoration: none;
    color: var(--text);
    font-size: 0.9rem;
    transition: all 0.2s;
}

.tab:hover, .tab.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.list-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 24px;
}

@media (max-width: 768px) {
    .list-layout { grid-template-columns: 1fr; }
    .hero-section h1 { font-size: 1.5rem; }
    .main-nav { display: none; }
}

/* ===== 정적 페이지 (소개/개인정보/문의) ===== */
.page-layout {
    max-width: 800px;
    margin: 0 auto;
}

.page-content {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
}

.page-content h1 {
    font-size: 1.75rem;
    margin-bottom: 8px;
}

.page-updated, .page-subtitle {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 32px;
}

.about-section, .privacy-section, .contact-section {
    margin-bottom: 32px;
    padding-bottom: 32px;
    border-bottom: 1px solid var(--border);
}

.about-section:last-child,
.privacy-section:last-child,
.contact-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.about-section h2, .privacy-section h2, .contact-section h2 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--primary);
}

.about-section p, .privacy-section p, .contact-section p {
    line-height: 1.8;
    color: var(--text);
}

.about-list, .privacy-list, .contact-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin: 12px 0;
}

.about-list li, .privacy-list li, .contact-list li {
    padding: 8px 12px;
    background: var(--bg);
    border-radius: var(--radius);
    font-size: 0.95rem;
}

.contact-email {
    font-size: 1.2rem;
    font-weight: 700;
    margin: 12px 0;
}

.contact-email a {
    color: var(--primary);
    text-decoration: none;
}

.contact-notice {
    background: #fffbeb;
    border: 1px solid #fcd34d;
    border-radius: var(--radius);
    padding: 16px;
    margin-top: 24px;
    font-size: 0.9rem;
    color: #92400e;
}