/* ============================================
   TinNhanh24h - Stylesheet chính
   ============================================ */

:root {
    --color-primary: #c1272d;
    --color-primary-dark: #96181d;
    --color-bg: #f4f5f7;
    --color-surface: #ffffff;
    --color-text: #1a1a1a;
    --color-text-muted: #6b6b6b;
    --color-border: #e6e6e6;
    --color-tag-bg: #f6e6e6;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

html.dark {
    --color-bg: #14161a;
    --color-surface: #1f2227;
    --color-text: #f0f0f0;
    --color-text-muted: #a0a0a0;
    --color-border: #2c2f36;
    --color-tag-bg: #3a2426;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font);
    background: var(--color-bg);
    color: var(--color-text);
    transition: background 0.2s ease, color 0.2s ease;
}

a { color: inherit; }

img { max-width: 100%; display: block; }

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

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.logo {
    font-size: 22px;
    font-weight: 800;
    color: var(--color-primary);
    text-decoration: none;
    white-space: nowrap;
}

.search-box {
    flex: 1;
    display: flex;
    max-width: 420px;
}

.search-box input {
    flex: 1;
    padding: 9px 14px;
    border: 1px solid var(--color-border);
    border-radius: 20px 0 0 20px;
    background: var(--color-bg);
    color: var(--color-text);
    font-size: 14px;
    outline: none;
}

.search-box button {
    border: none;
    background: var(--color-primary);
    color: #fff;
    padding: 0 16px;
    border-radius: 0 20px 20px 0;
    cursor: pointer;
}

.header-actions {
    display: flex;
    gap: 8px;
    margin-left: auto;
}

.icon-btn {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 50%;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    text-decoration: none;
    font-size: 16px;
}

.header-ad-wrapper {
    max-width: 1200px;
    margin: 0 auto;
    padding: 8px 20px 0;
}

.category-nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px 10px;
    display: flex;
    gap: 6px;
    overflow-x: auto;
    scrollbar-width: none;
}
.category-nav::-webkit-scrollbar { display: none; }

.category-nav a {
    text-decoration: none;
    padding: 6px 14px;
    border-radius: 16px;
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-muted);
    white-space: nowrap;
    background: var(--color-bg);
}

.category-nav a.active,
.category-nav a:hover {
    background: var(--color-primary);
    color: #fff;
}

/* ===== Layout ===== */
.site-main {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    align-items: start;
}

@media (max-width: 860px) {
    .site-main { grid-template-columns: 1fr; }
    .sidebar { order: 2; }
}

/* ===== Article Card ===== */
.article-grid { display: flex; flex-direction: column; gap: 16px; }

.article-card {
    display: flex;
    gap: 16px;
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 14px;
    box-shadow: var(--shadow);
    position: relative;
}

.article-card .thumb {
    width: 180px;
    height: 112px;
    flex-shrink: 0;
    border-radius: 8px;
    overflow: hidden;
    background: var(--color-border);
}
.article-card .thumb img {
    width: 100%; height: 100%; object-fit: cover;
}

.article-body { flex: 1; min-width: 0; }

.article-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--color-text-muted);
    margin-bottom: 6px;
}

.source-tag {
    background: var(--color-tag-bg);
    color: var(--color-primary);
    padding: 2px 10px;
    border-radius: 10px;
    font-weight: 700;
}

.article-title {
    margin: 0 0 6px;
    font-size: 17px;
    line-height: 1.4;
}
.article-title a { text-decoration: none; }
.article-title a:hover { color: var(--color-primary); }

.article-summary {
    margin: 0;
    font-size: 14px;
    color: var(--color-text-muted);
    line-height: 1.55;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.bookmark-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0,0,0,0.45);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 30px;
    height: 30px;
    cursor: pointer;
    font-size: 14px;
}
.bookmark-btn.active { background: var(--color-primary); }

@media (max-width: 560px) {
    .article-card { flex-direction: column; }
    .article-card .thumb { width: 100%; height: 180px; }
}

/* ===== Sidebar ===== */
.sidebar-box {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 16px;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
}
.sidebar-box h3 {
    margin: 0 0 12px;
    font-size: 15px;
    border-left: 4px solid var(--color-primary);
    padding-left: 10px;
}
.trending-item {
    display: flex;
    gap: 10px;
    padding: 10px 0;
    border-bottom: 1px solid var(--color-border);
    text-decoration: none;
    color: var(--color-text);
}
.trending-item:last-child { border-bottom: none; }
.trending-rank {
    font-weight: 800;
    font-size: 18px;
    color: var(--color-primary);
    width: 22px;
    flex-shrink: 0;
}
.trending-item h4 {
    margin: 0;
    font-size: 13.5px;
    line-height: 1.4;
    font-weight: 600;
}

.newsletter-box input {
    width: 100%;
    padding: 9px 12px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    margin-bottom: 8px;
    background: var(--color-bg);
    color: var(--color-text);
}
.newsletter-box button {
    width: 100%;
    padding: 10px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

/* ===== Ads ===== */
.ad-slot {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 10px;
    box-shadow: var(--shadow);
    text-align: center;
    overflow: hidden;
}
.ad-label {
    display: block;
    font-size: 10px;
    color: var(--color-text-muted);
    text-transform: uppercase;
    margin-bottom: 6px;
    letter-spacing: 0.05em;
}

/* ===== Pagination ===== */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin: 24px 0;
    flex-wrap: wrap;
}
.pagination a {
    padding: 8px 14px;
    background: var(--color-surface);
    border-radius: 6px;
    text-decoration: none;
    box-shadow: var(--shadow);
    font-size: 14px;
}
.pagination a.active { background: var(--color-primary); color: #fff; }
.pagination a.page-nav { font-weight: 600; }
.pagination .page-ellipsis {
    padding: 8px 4px;
    color: var(--color-text-muted);
}

/* ===== Empty state ===== */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-text-muted);
}

/* ===== Footer ===== */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    margin-top: 40px;
}
.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 24px;
}
.footer-col h3 { font-size: 14px; margin-bottom: 10px; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 6px; font-size: 13px; }
.footer-col a { text-decoration: none; color: var(--color-text-muted); }
.footer-col a:hover { color: var(--color-primary); }
.footer-note { font-size: 12px; color: var(--color-text-muted); }
.footer-bottom {
    text-align: center;
    font-size: 12px;
    color: var(--color-text-muted);
    padding: 14px 0 24px;
}
@media (max-width: 700px) {
    .footer-inner { grid-template-columns: 1fr; }
}