:root {
  --navy: #081f4d;
  --navy-light: #1e4e8c;
  --gold: #e8b41e;
  --text: #1a1a19;
  --text-secondary: #52514e;
  --surface: #fcfcfb;
  --border: #e5e4e0;
}
* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif; margin:0; color: var(--text); background: var(--surface); line-height: 1.65; overflow-x: hidden; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
a { color: var(--navy-light); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; display: block; }

/* Header — mobile-first: logo + hamburger row, nav collapses via checkbox toggle (no JS) */
.site-header { background: var(--navy); position: sticky; top:0; z-index: 10; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 20px; flex-wrap: wrap; gap: 8px 0; position: relative; }
.brand { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: bold; font-size: 17px; min-height: 44px; }
.brand img { width: 34px; height: 34px; border-radius: 50%; }
.brand:hover { text-decoration: none; }
nav { display: flex; align-items: center; flex-wrap: wrap; gap: 4px 8px; }
nav a { color: #cdd8ee; margin-left: 12px; font-size: 15px; padding: 10px 4px; min-height: 44px; display: flex; align-items: center; }
nav a:hover { color: #fff; text-decoration: none; }
.btn-tiktok-nav { background: var(--gold); color: var(--navy) !important; padding: 10px 16px !important; border-radius: 6px; font-weight: bold; }

/* Hero */
.hero { background: linear-gradient(135deg, var(--navy) 0%, var(--navy-light) 100%); color: #fff; padding: clamp(36px, 8vw, 64px) 0; }
.hero h1 { font-size: clamp(24px, 5.5vw, 36px); margin: 0 0 16px; color: #fff; line-height: 1.25; }
.hero p { font-size: clamp(15px, 3vw, 18px); color: #cdd8ee; max-width: 640px; }
.hero-badges { margin-top: 24px; display: flex; gap: 8px; flex-wrap: wrap; }
.hero-badges span { background: rgba(255,255,255,0.12); padding: 6px 12px; border-radius: 20px; font-size: 12px; color: #fff; white-space: nowrap; }

/* Section */
section { padding: clamp(28px, 6vw, 48px) 0; }
.section-title { font-size: clamp(20px, 4vw, 24px); color: var(--navy); margin-bottom: 20px; display:flex; align-items:baseline; justify-content:space-between; flex-wrap: wrap; gap: 8px; }
.section-title a { font-size: 14px; }

@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .header-inner { padding: 10px 16px; }
  nav a { margin-left: 8px; font-size: 14px; }
}

/* Article grid/cards */
.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
@media (max-width: 900px) { .grid { grid-template-columns: repeat(2, 1fr); gap: 16px; } }
@media (max-width: 560px) { .grid { grid-template-columns: 1fr; gap: 16px; } }
.card { background: #fff; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; display: block; color: var(--text); transition: box-shadow .15s, transform .15s; -webkit-tap-highlight-color: rgba(8,31,77,0.08); }
.card:hover, .card:active { box-shadow: 0 6px 20px rgba(8,31,77,0.12); text-decoration: none; }
.card:hover { transform: translateY(-2px); }
.card img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
.card-body { padding: 16px; }
.card-category { font-size: 11px; text-transform: uppercase; letter-spacing: .04em; color: var(--gold); font-weight: bold; }
.card-title { font-size: 16px; font-weight: bold; margin: 6px 0; color: var(--navy); line-height: 1.4; }
.card-excerpt { font-size: 14px; color: var(--text-secondary); margin: 0; }

/* Category filter — horizontal scroll on mobile instead of wrapping into a wall of chips */
.filters { display: flex; gap: 8px; margin-bottom: 24px; overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 4px; scrollbar-width: thin; }
.filters a { padding: 8px 14px; border-radius: 20px; border: 1px solid var(--border); font-size: 13px; color: var(--text-secondary); white-space: nowrap; flex-shrink: 0; min-height: 36px; display: flex; align-items: center; }
.filters a.active, .filters a:hover { background: var(--navy); color: #fff; border-color: var(--navy); text-decoration: none; }

/* Search */
.search-box { margin-bottom: 24px; }
.search-box input { width: 100%; max-width: 420px; padding: 12px 16px; border: 1px solid var(--border); border-radius: 8px; font-size: 16px; }

/* Article page */
.article-page { max-width: 720px; margin: 0 auto; padding: clamp(24px, 6vw, 40px) 20px; }
.article-page .back { font-size: 14px; display: inline-block; padding: 8px 0; min-height: 44px; display: inline-flex; align-items: center; }
.article-page .cover { width: 100%; border-radius: 12px; margin: 16px 0 20px; aspect-ratio: 16/9; object-fit: cover; }
.article-page .category-tag { display:inline-block; background: var(--gold); color: var(--navy); font-size: 12px; font-weight:bold; padding: 4px 10px; border-radius: 12px; margin-bottom: 12px; }
.article-page h1 { color: var(--navy); font-size: clamp(22px, 5.5vw, 30px); line-height: 1.3; margin: 0 0 8px; }
.article-page .meta { color: var(--text-secondary); font-size: 14px; margin-bottom: 20px; }
.article-page, .article-page p, .article-page li { font-size: 16px; }
.article-page h2 { color: var(--navy-light); font-size: clamp(18px, 4.5vw, 20px); margin-top: 28px; }
.article-page .source { margin-top: 36px; padding-top: 16px; border-top: 1px solid var(--border); font-size: 14px; color: var(--text-secondary); word-break: break-word; }
.related-section { margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--border); }

/* Footer */
.site-footer { background: var(--navy); color: #cdd8ee; margin-top: 48px; }
.footer-inner { padding: 28px 20px; font-size: 13px; }
.footer-inner a { display: inline-block; padding: 6px 0; }
.disclaimer { max-width: 640px; opacity: 0.8; }

/* Simple pages (terms/privacy/404) */
.simple-page { max-width: 720px; margin: 0 auto; padding: clamp(28px, 6vw, 48px) 20px; line-height: 1.7; font-size: 16px; }
.simple-page h1 { color: var(--navy); font-size: clamp(22px, 5.5vw, 28px); }

/* Chạm dễ hơn trên toàn site: đảm bảo mọi link/nút đạt tối thiểu vùng chạm 44px theo khuyến nghị Apple/Google */
@media (hover: none) and (pointer: coarse) {
  .card-title { font-size: 15px; }
}
.simple-page h2 { color: var(--navy-light); margin-top: 32px; }