/* ============================================================
   MATRIX HANZI BLOG — SERIES "GIẢI PHẪU TIẾNG TRUNG"
   Lớp CSS bổ sung, dùng chung design system của blog.
   ============================================================ */

/* ---------- Hero của series (trang mục lục) ---------- */
.series-hero{max-width:var(--max);margin:0 auto;padding:56px 22px 22px;position:relative}
.series-hero .kicker{display:inline-flex;align-items:center;gap:8px;padding:7px 14px;border:1px solid var(--line);background:var(--accent-soft);color:var(--accent-deep);border-radius:999px;font-size:.8rem;font-weight:800;font-family:var(--font-ui);letter-spacing:.02em}
.series-hero h1{font-family:var(--font-serif);font-weight:700;font-size:clamp(2.2rem,5vw,3.7rem);line-height:1.1;letter-spacing:-.015em;margin:20px 0 16px}
.series-hero .deck{font-size:1.18rem;color:var(--ink-soft);max-width:720px;line-height:1.72}
.series-hero .meta{margin-top:18px}
.series-stat{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));gap:14px;max-width:var(--max);margin:26px auto 0;padding:0 22px}
.series-stat .stat{padding:16px 14px}
.series-stat .stat b{font-size:1.5rem}

/* ---------- Nhịp đọc / phần ---------- */
.part-block{max-width:var(--max);margin:34px auto 0;padding:0 22px}
.part-head{display:flex;align-items:baseline;gap:14px;margin:0 0 16px;flex-wrap:wrap}
.part-head .part-no{font-family:var(--font-ui);font-weight:800;font-size:.78rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);border:1px solid var(--line);background:var(--paper);padding:6px 12px;border-radius:999px}
.part-head h2{font-family:var(--font-serif);font-size:clamp(1.3rem,2.4vw,1.75rem);margin:0;color:var(--ink);font-weight:700}
.part-head p{margin:0;color:var(--muted);font-size:.95rem;flex:1 1 100%}
.chapter-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(330px,1fr));gap:20px}
.chapter-card{--card-accent:var(--accent);display:flex;flex-direction:column;gap:12px;text-decoration:none;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-lg);padding:22px 22px 20px;box-shadow:var(--shadow-soft);position:relative;overflow:hidden;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease}
.chapter-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--card-accent);opacity:.85}
.chapter-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-card);border-color:var(--card-accent)}
.chapter-card .num{font-family:var(--font-serif);font-size:2.6rem;line-height:1;font-weight:700;color:var(--card-accent);opacity:.9}
.chapter-card .chapter-kicker{font-family:var(--font-ui);font-size:.72rem;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.chapter-card h3{font-family:var(--font-serif);font-size:1.3rem;line-height:1.35;margin:0;color:var(--ink);font-weight:700}
.chapter-card .chapter-q{margin:0;color:var(--ink-soft);font-size:.98rem;line-height:1.6}
.chapter-card .chapter-dek{margin:0;color:var(--muted);font-size:.93rem;line-height:1.6}
.chapter-card .chapter-foot{margin-top:auto;display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:12px;border-top:1px dashed var(--line)}
.chapter-card .chapter-foot .go{font-family:var(--font-ui);font-weight:700;font-size:.86rem;color:var(--card-accent)}
.chip{display:inline-block;padding:4px 11px;border-radius:999px;border:1px solid var(--line);background:var(--paper-2);color:var(--muted);font-size:.78rem;font-weight:600;font-family:var(--font-ui)}

/* ---------- Trang chương ---------- */
.chapter-hero{max-width:var(--max);margin:0 auto;padding:48px 22px 10px}
.chapter-hero .crumb{margin-bottom:6px}
.chapter-hero h1{font-family:var(--font-serif);font-weight:700;font-size:clamp(2rem,4.4vw,3.1rem);line-height:1.16;margin:16px 0 12px;letter-spacing:-.01em}
.chapter-hero .big-q{font-family:var(--font-serif);font-style:italic;font-size:1.15rem;color:var(--accent-deep);border-left:3px solid var(--accent);padding-left:16px;margin:18px 0 0;max-width:760px}
.article-stack{max-width:var(--max);margin:30px auto 0;padding:0 22px;display:grid;gap:18px}
.article-row{display:grid;grid-template-columns:120px minmax(0,1fr) auto;gap:20px;align-items:center;text-decoration:none;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-lg);padding:20px 22px;box-shadow:var(--shadow-soft);transition:transform .16s ease,box-shadow .16s ease,border-color .16s ease}
.article-row:hover{transform:translateY(-3px);box-shadow:var(--shadow-card);border-color:var(--accent)}
.article-row .thumb{width:120px;aspect-ratio:4/3;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:var(--paper-2)}
.article-row .thumb img{width:100%;height:100%;object-fit:cover;display:block}
.article-row .body h3{font-family:var(--font-serif);font-size:1.24rem;margin:0 0 6px;color:var(--ink);font-weight:700;line-height:1.4}
.article-row:hover .body h3{color:var(--accent-deep)}
.article-row .body p{margin:0 0 8px;color:var(--muted);font-size:.95rem;line-height:1.6}
.article-row .caret{font-family:var(--font-ui);font-weight:800;color:var(--accent);font-size:1.2rem}

/* ---------- Điều hướng bài/chương ---------- */
.breadcrumbs{display:flex;flex-wrap:wrap;gap:6px;align-items:center;font-size:.85rem;color:var(--muted);font-family:var(--font-ui)}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:var(--accent)}
.breadcrumbs .sep{opacity:.5}
.pager{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:2.4em 0 0}
.pager a{display:flex;flex-direction:column;gap:6px;text-decoration:none;border:1px solid var(--line);background:var(--paper-2);border-radius:var(--radius-md);padding:16px 18px;box-shadow:var(--shadow-soft);transition:transform .15s ease,border-color .15s ease}
.pager a:hover{transform:translateY(-2px);border-color:var(--accent)}
.pager .dir{font-family:var(--font-ui);font-size:.72rem;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}
.pager .ttl{font-family:var(--font-serif);font-size:1.02rem;color:var(--ink);line-height:1.4}
.pager a.next{text-align:right}
.pager .empty{visibility:hidden}

/* ---------- Khối nguồn ---------- */
.sources{margin:2.6em 0 0;padding:22px 24px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--paper-2)}
.sources h2{font-family:var(--font-ui);font-size:.8rem!important;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin:0 0 12px!important}
.sources h2::after{display:none!important}
.sources ul{margin:0;padding-left:1.2em;font-size:.95rem;color:var(--ink-soft)}
.sources li{margin-bottom:8px}
.sources li::marker{color:var(--accent)}

/* ---------- Trạng thái bằng chứng ---------- */
.evidence{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0 4px}
.evidence .ev{display:inline-flex;align-items:center;gap:7px;padding:5px 12px;border-radius:999px;font-size:.78rem;font-weight:700;font-family:var(--font-ui);border:1px solid var(--line);background:var(--paper)}
.evidence .ev::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--muted)}
.evidence .ev.verified{color:#0f766e;border-color:color-mix(in srgb,#0f766e 35%,transparent)}.evidence .ev.verified::before{background:#0f766e}
.evidence .ev.contested{color:#b45309;border-color:color-mix(in srgb,#b45309 35%,transparent)}.evidence .ev.contested::before{background:#b45309}
.evidence .ev.unverified{color:#64748b}.evidence .ev.unverified::before{background:#64748b}

/* ---------- Dải thông tin series ở chân bài ---------- */
.series-banner{max-width:var(--max);margin:40px auto 0;padding:0 22px}
.series-banner .inner{display:flex;gap:20px;align-items:center;justify-content:space-between;flex-wrap:wrap;background:linear-gradient(130deg,var(--accent-deep),var(--accent));color:#fff;border-radius:var(--radius-lg);padding:24px 28px;box-shadow:var(--shadow-card)}
.series-banner b{display:block;font-family:var(--font-serif);font-size:1.25rem;margin-bottom:4px}
.series-banner span{color:rgba(255,255,255,.85);font-size:.95rem}
.series-banner a{flex:0 0 auto;text-decoration:none;background:#fff;color:var(--accent-deep);font-family:var(--font-ui);font-weight:800;padding:12px 22px;border-radius:999px}
.series-banner a:hover{transform:translateY(-1px)}

/* ---------- Bảng so sánh trong bài ---------- */
.article table{width:100%;border-collapse:collapse;margin:1.8em 0;font-size:.95rem;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius-md);overflow:hidden}
.article thead th{background:var(--accent-soft);color:var(--accent-deep);font-family:var(--font-ui);font-size:.82rem;letter-spacing:.03em;text-transform:uppercase;text-align:left;padding:12px 14px}
.article tbody td{padding:11px 14px;border-top:1px solid var(--line);color:var(--ink-soft);vertical-align:top}
.article tbody tr:nth-child(even){background:var(--paper-2)}

@media(max-width:760px){
  .article-row{grid-template-columns:1fr;gap:14px}
  .article-row .thumb{width:100%;aspect-ratio:16/9}
  .pager{grid-template-columns:1fr}
  .pager a.next{text-align:left}
  .series-banner .inner{padding:20px}
}
/* ---------- Nút lên đầu trang + hint bàn phím ---------- */
.to-top{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;display:grid;place-items:center;text-decoration:none;font-size:1.2rem;font-weight:800;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent-2));box-shadow:var(--shadow-card);opacity:0;pointer-events:none;transform:translateY(10px);transition:opacity .2s ease,transform .2s ease;z-index:50}
.to-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
@media(max-width:680px){.to-top{right:14px;bottom:14px;width:42px;height:42px}}