/* ============================================================
   Sách Hiếm — Modern Warm-Paper Editorial Design System
   Phong cách "giấy báo cổ điển": nền giấy ấm, mực sẫm,
   serif văn chương, điểm nhấn màu gụ (#8a3324).
   ============================================================ */

:root {
  --font-display: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-ui: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Light — giấy ngả vàng nhẹ (mặc định) */
  --bg: #f7f2e8;
  --surface: #fffdf7;
  --surface-2: #efe8da;
  --ink: #231d15;
  --ink-soft: #5d5444;
  --ink-faint: #8a7f6c;
  --accent: #8a3324;        /* màu gụ / oxblood */
  --accent-soft: #f3e2d8;
  --rule: #d8cdb8;
  --rule-strong: #b3a488;
  --link: #8a3324;
  --link-hover: #5e1f14;
  --code-bg: #efe8da;
  --shadow: 0 1px 2px rgba(35, 29, 21, 0.06);
  --measure: 46rem;
}

/* Dark mode: bật qua nút trên menu (data-theme="dark") */
:root[data-theme='dark'] {
  --bg: #16130e;
  --surface: #1e1a13;
  --surface-2: #2a2519;
  --ink: #e9e1d2;
  --ink-soft: #b3a88f;
  --ink-faint: #7d745f;
  --accent: #cf6a4c;
  --accent-soft: #3a2518;
  --rule: #3c3526;
  --rule-strong: #5a5140;
  --link: #cf6a4c;
  --link-hover: #e8896d;
  --code-bg: #2a2519;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 1.0625rem;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent); color: #fff; }

a {
  color: var(--link);
  text-decoration-color: rgba(138, 51, 36, 0.4);
  text-underline-offset: 3px;
}
a:hover {
  color: var(--link-hover);
  text-decoration-color: currentColor;
}

/* ---------- Masthead ---------- */
.masthead {
  border-bottom: 3px double var(--rule-strong);
  padding: 2rem 1rem 1.35rem;
  text-align: center;
  background: radial-gradient(1200px 300px at 50% -100px, rgba(138, 51, 36, 0.07), transparent);
}
.masthead .brand {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  letter-spacing: 0.04em;
  margin: 0;
  line-height: 1.15;
}
.masthead .brand a { color: var(--ink); text-decoration: none; }
.masthead .tagline {
  font-style: italic;
  color: var(--ink-soft);
  margin: 0.45rem 0 0;
  font-size: 0.96rem;
}
.masthead nav {
  margin-top: 1.05rem;
  display: flex;
  gap: 0.4rem;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  font-family: var(--font-ui);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.masthead nav > a {
  color: var(--ink-soft);
  text-decoration: none;
  padding: 0.32rem 0.82rem;
  border: 1px solid transparent;
  border-radius: 999px;
}
.masthead nav > a:hover { color: var(--accent); border-color: var(--rule); background: var(--surface); }
.masthead nav > a[aria-current="page"] { color: var(--accent); border-color: var(--rule-strong); background: var(--surface); }

/* Dropdown Chuyên mục */
.dropdown { position: relative; }
.dropbtn {
  font: inherit;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: none;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.32rem 0.82rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.dropbtn .caret { font-size: 0.75em; transition: transform 0.15s ease; }
.dropdown:hover .dropbtn,
.dropdown:focus-within .dropbtn { color: var(--accent); border-color: var(--rule); background: var(--surface); }
.dropdown:hover .caret,
.dropdown:focus-within .caret { transform: rotate(180deg); }
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  min-width: 13rem;
  max-height: 26rem;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 8px;
  box-shadow: var(--shadow), 0 6px 20px rgba(35, 29, 21, 0.12);
  padding: 0.45rem;
  display: grid;
  gap: 0.15rem;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 50;
  text-align: left;
}
.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.dropdown-menu a {
  text-decoration: none;
  text-transform: none;
  letter-spacing: 0.02em;
  font-size: 0.88rem;
  color: var(--ink);
  padding: 0.48rem 0.75rem;
  border-radius: 5px;
  border: none;
  display: block;
}
.dropdown-menu a:hover { background: var(--surface-2); color: var(--accent); }
.dropdown-menu a[aria-current="page"] { color: var(--accent); background: var(--accent-soft); }

/* Nút icon (tìm kiếm, sáng/tối) */
.icon-link, .icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border-radius: 999px;
  color: var(--ink-soft);
  background: none;
  border: 1px solid transparent;
  cursor: pointer;
  font: inherit;
  text-decoration: none;
}
.icon-link:hover, .icon-btn:hover { color: var(--accent); border-color: var(--rule); background: var(--surface); }
.icon-btn .icon-sun { display: none; }
:root[data-theme='dark'] .icon-btn .icon-sun { display: inline; }
:root[data-theme='dark'] .icon-btn .icon-moon { display: none; }

/* ---------- Container ---------- */
.container {
  max-width: 72rem;
  margin: 0 auto;
  padding: 1.8rem 1.25rem 4rem;
}

/* ---------- Home hero ---------- */
.hero {
  text-align: center;
  padding: 2.2rem 1rem 1.8rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: 1.8rem;
}
.hero h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 700;
  margin: 0 0 0.7rem;
}
.hero p { color: var(--ink-soft); max-width: 42rem; margin: 0 auto; font-style: italic; }

/* ---------- Section headings ---------- */
.section-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.4rem 0 1rem;
  padding-bottom: 0.45rem;
  border-bottom: 2px solid var(--rule-strong);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}
.section-title .section-more {
  font-family: var(--font-ui);
  font-size: 0.84rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--accent);
}
.section-title .section-more:hover { text-decoration: underline; }

/* ---------- Hàng "Bài mới nhất": cuộn ngang, card to + mũi tên ---------- */
.scroll-wrap { position: relative; }
.recent-scroll {
  display: flex;
  gap: 1.4rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding: 0.3rem 0.2rem 1rem;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
  scrollbar-color: var(--rule-strong) transparent;
}
.recent-scroll::-webkit-scrollbar { height: 8px; }
.recent-scroll::-webkit-scrollbar-thumb { background: var(--rule-strong); border-radius: 4px; }
.recent-scroll::-webkit-scrollbar-track { background: transparent; }
.recent-scroll .card {
  flex: 0 0 min(82vw, 23rem);
  scroll-snap-align: start;
}
.recent-scroll .card .card-img { height: 12.5rem; }
.recent-scroll .card .card-img-fallback { height: 12.5rem; }
.recent-scroll .card .card-title { font-size: 1.25rem; line-height: 1.32; }
.recent-scroll .card .card-meta { font-size: 0.8rem; }
.recent-scroll .card .card-excerpt {
  font-size: 0.94rem;
  -webkit-line-clamp: 4;
}

.scroll-arrow {
  position: absolute;
  top: 38%;
  z-index: 3;
  width: 2.8rem;
  height: 2.8rem;
  border-radius: 50%;
  border: 1px solid var(--rule-strong);
  background: var(--surface);
  color: var(--ink);
  font-size: 1.85rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 0 0.18rem;
  opacity: 0.94;
}
.scroll-arrow:hover { background: var(--accent); color: #fff; border-color: var(--accent); opacity: 1; }
.scroll-arrow.prev { left: -0.6rem; }
.scroll-arrow.next { right: -0.6rem; }
html.sh-mobile .scroll-arrow { display: none; }

.scroll-hint {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  margin: 0.1rem 0 1.4rem;
  text-align: right;
}
.scroll-hint .arr {
  font-size: 1.5em;
  line-height: 0;
  vertical-align: -0.14em;
  color: var(--ink-soft);
}

/* ---------- Cards & Canonical 3-Column Desktop Grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.35rem;
  margin-top: 1.2rem;
}

/* Desktop (`html.sh-desktop`) ALWAYS preserves 3 columns on desktop computers */
html.sh-desktop .card-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

/* Mobile (`html.sh-mobile`) stacks cleanly into 1 column */
html.sh-mobile .card-grid {
  grid-template-columns: 1fr;
}

/* No-JS fallback for touch-only mobile phones */
@media screen and (max-width: 860px) and (any-hover: none) and (pointer: coarse) {
  html:not(.sh-desktop) .card-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 4px;
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.card:hover { border-color: var(--rule-strong); }
.card .card-img-link {
  display: block;
  margin: -1.25rem -1.35rem 0.35rem;
  overflow: hidden;
  border-radius: 4px 4px 0 0;
}
.card .card-img {
  display: block;
  width: 100%;
  height: 11rem;
  object-fit: cover;
  transition: transform 0.25s ease;
}
.card:hover .card-img { transform: scale(1.02); }
.card .card-img-fallback {
  height: 8.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-style: italic;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  background:
    repeating-linear-gradient(45deg, transparent, transparent 8px, rgba(35, 29, 21, 0.03) 8px, rgba(35, 29, 21, 0.03) 9px),
    var(--surface-2);
  border-bottom: 1px solid var(--rule);
  text-decoration: none;
}
.card .card-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  line-height: 1.35;
}
.card .card-title a { color: var(--ink); text-decoration: none; }
.card .card-title a:hover { color: var(--accent); }
.card-title .card-sub {
  display: block;
  font-size: 0.82em;
  font-weight: 400;
  color: var(--ink-soft);
  margin-top: 0.15rem;
}
.card .card-meta {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  color: var(--ink-faint);
  letter-spacing: 0.02em;
  margin-top: auto;
  padding-top: 0.35rem;
}
.card .card-meta a { text-decoration: none; color: var(--accent); font-weight: 600; }
.card .card-meta a:hover { text-decoration: underline; }
.card .card-meta .author { color: var(--accent); }
.card .card-excerpt {
  font-size: 0.92rem;
  color: var(--ink-soft);
  line-height: 1.62;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ---------- Article lists inside category cards & directory pages ---------- */
.article-list { list-style: none; margin: 0; padding: 0; }
.article-list li { border-bottom: 1px solid var(--rule); }
.article-list li:last-child { border-bottom: 1px solid var(--rule); }
.article-list a {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.9rem;
  align-items: baseline;
  padding: 0.72rem 0.15rem;
  text-decoration: none;
  color: var(--ink);
}
.article-list a:hover { color: var(--accent); }
.article-list .t { flex: 1 1 100%; font-weight: 600; line-height: 1.42; font-size: 0.98rem; }
.article-list .t .sub { font-weight: 400; color: var(--ink-soft); }
.article-list .d { font-family: var(--font-ui); font-size: 0.76rem; color: var(--ink-faint); letter-spacing: 0.03em; }
.article-list .a { font-family: var(--font-ui); font-size: 0.78rem; color: var(--accent); }

/* Homepage Hộp thư & Tin Đó Đây split */
.home-dual-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.6rem;
  margin-top: 2rem;
}
html.sh-mobile .home-dual-grid {
  grid-template-columns: 1fr;
}
@media screen and (max-width: 860px) and (any-hover: none) and (pointer: coarse) {
  html:not(.sh-desktop) .home-dual-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Article Reading Page (Heading Above + Content + Arrow Pointers) ---------- */
.article {
  max-width: var(--measure);
  margin: 0 auto;
}

/* Top & Bottom Clean Editorial Arrow Pointer Bar */
.editorial-arrow-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem 1.2rem;
  padding: 0.65rem 0;
  margin-bottom: 1.6rem;
  border-bottom: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.86rem;
}
.editorial-arrow-bar.bottom {
  margin-top: 2.2rem;
  margin-bottom: 0.5rem;
  border-top: 1px solid var(--rule);
  border-bottom: none;
  padding-top: 1rem;
}
.editorial-arrow-bar a {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  text-decoration: none;
  color: var(--ink-soft);
  font-weight: 600;
  padding: 0.32rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--rule);
  background: var(--surface);
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}
.editorial-arrow-bar a:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.editorial-arrow-bar a.next-part-pill {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.editorial-arrow-bar a.next-part-pill:hover {
  background: var(--link-hover);
  border-color: var(--link-hover);
  color: #fff;
}
.editorial-arrow-right {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.article-header { margin-bottom: 2rem; }
.article-header .kicker {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.65rem;
}
.article-header .kicker a { color: inherit; text-decoration: none; }
.article-header .kicker a:hover { text-decoration: underline; }
.article-header h1 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.65rem, 3.8vw, 2.35rem);
  line-height: 1.26;
  margin: 0 0 0.9rem;
}
.article-subtitle {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin: 0 0 0.85rem;
  line-height: 1.35;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.85rem;
  align-items: baseline;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 0.65rem 0;
}
.article-meta .author { color: var(--accent); font-weight: 600; text-decoration: none; }
.article-meta a.author:hover { text-decoration: underline; }
.article-meta .dot { color: var(--ink-faint); }

/* ---------- Body of articles (HTML kế thừa + bài mới) ---------- */
.article-body {
  font-size: 1.0625rem;
  line-height: 1.88;
}
.article-body p { margin: 0 0 1.1rem; text-align: justify; }
html.sh-mobile .article-body p { text-align: left; }
.article-body h2, .article-body h3, .article-body h4 {
  font-family: var(--font-display);
  line-height: 1.32;
  margin: 1.9rem 0 0.85rem;
  color: var(--ink);
}
.article-body h2 { font-size: 1.42rem; }
.article-body h3 { font-size: 1.2rem; }
.article-body img, .article-body video, .article-body iframe {
  max-width: 100%;
  height: auto;
}
.article-body img {
  display: block;
  margin: 1.4rem auto;
  border-radius: 3px;
}
.article-body a { text-decoration: underline; }
.article-body blockquote {
  margin: 1.5rem 0;
  padding: 0.2rem 0 0.2rem 1.35rem;
  border-left: 3px solid var(--accent);
  color: var(--ink-soft);
  font-style: italic;
}
.article-body table {
  max-width: 100%;
  border-collapse: collapse;
  margin: 1.4rem auto;
  font-size: 0.96rem;
  background: var(--surface);
}
.article-body table th, .article-body table td {
  border: 1px solid var(--rule);
  padding: 0.5rem 0.75rem;
  vertical-align: top;
}
.article-body hr { border: 0; border-top: 1px solid var(--rule); margin: 1.8rem 0; }

/* Legacy Sách Hiếm classes mapped cleanly into editorial typography */
.article-body .tomluoc {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.3rem;
  margin: 1.5rem 0;
  color: var(--ink-soft);
  border-radius: 0 4px 4px 0;
  box-shadow: var(--shadow);
}
.article-body .Tuatren {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  margin: 1.2rem 0 0.6rem;
}
.article-body .Tuaduoi,
.article-body .TuaChuong,
.article-body .CHUONG,
.article-body .PHAN {
  font-family: var(--font-display);
  font-size: 1.28rem;
  font-weight: 700;
  color: var(--accent);
  text-align: center;
  margin: 1.6rem 0 0.8rem;
}
.article-body .MUC,
.article-body .TuaDenLeft,
.article-body .TuaDoLeft {
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 700;
  color: var(--accent);
  margin: 1.5rem 0 0.6rem;
}
.article-body .Tacgia,
.article-body .TacgiaL,
.article-body .TacgiaR {
  font-style: italic;
  color: var(--ink-soft);
}
.article-body .Tacgia { text-align: center; }
.article-body .TacgiaR { text-align: right; }
.article-body .indentLR50 { padding: 0; margin: 0; }
.article-body .indent50 { padding-left: 1.5rem; }
.article-body .PicLeft { float: left; margin: 0 1.2rem 0.8rem 0; max-width: 48%; font-size: 0.9rem; font-style: italic; color: var(--ink-soft); text-align: center; }
.article-body .PicRgt { float: right; margin: 0 0 0.8rem 1.2rem; max-width: 48%; font-size: 0.9rem; font-style: italic; color: var(--ink-soft); text-align: center; }

/* ---------- Related articles, source back-links & bottom footer nav ---------- */
.breadcrumb {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  letter-spacing: 0.03em;
  color: var(--ink-faint);
  margin: 0 0 1.4rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1rem;
}
.breadcrumb a { color: var(--ink-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb .sep { margin: 0 0.45rem; color: var(--ink-faint); }

.related {
  margin-top: 2.6rem;
  padding-top: 1.5rem;
  border-top: 2px solid var(--rule-strong);
}
.related-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  margin: 0 0 0.7rem;
}

.source-block {
  margin-top: 2.5rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.86rem;
  color: var(--ink-soft);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.9rem 1.4rem;
  align-items: center;
}
.source-block a { color: var(--accent); text-decoration: none; word-break: break-word; }
.source-block a:hover { text-decoration: underline; }
.back-links { display: flex; gap: 1.2rem; flex-wrap: wrap; align-items: center; }

.article-footer-nav {
  display: flex;
  justify-content: space-between;
  gap: 1.2rem;
  margin-top: 2rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-ui);
  font-size: 0.9rem;
}
.article-footer-nav a {
  display: block;
  max-width: 47%;
  text-decoration: none;
  color: var(--ink-soft);
  line-height: 1.45;
}
.article-footer-nav a:hover { color: var(--accent); }
.article-footer-nav .dir {
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-faint);
  font-weight: 600;
  margin-bottom: 0.28rem;
}
.article-footer-nav a:hover .dir { color: var(--accent); }
.article-footer-nav .next { text-align: right; margin-left: auto; }

/* ---------- Category, Author & Search Headers ---------- */
.category-header {
  text-align: center;
  padding: 1.8rem 1rem 1.4rem;
  border-bottom: 2px solid var(--rule-strong);
  margin-bottom: 1.5rem;
}
.category-header .kicker {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.4rem;
}
.category-header .name {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin: 0.3rem 0;
}
.category-header .count {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

.author-header {
  display: flex;
  gap: 1.5rem;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 1.6rem;
  box-shadow: var(--shadow);
  margin-bottom: 1.6rem;
}
.author-avatar {
  width: 5.5rem;
  height: 5.5rem;
  border-radius: 50%;
  border: 2px solid var(--rule-strong);
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--accent);
  flex-shrink: 0;
}
.author-header .name { font-family: var(--font-display); font-size: 1.65rem; font-weight: 700; margin: 0 0 0.25rem; }
.author-header .bio { color: var(--ink-soft); font-size: 0.94rem; line-height: 1.65; margin: 0.25rem 0; }

.author-chips { display: flex; flex-wrap: wrap; gap: 0.55rem; margin: 0 0 1.4rem; }
.author-chip {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  padding: 0.42rem 0.88rem;
  border: 1px solid var(--rule);
  border-radius: 999px;
  background: var(--surface);
  text-decoration: none;
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 0.9rem;
}
.author-chip:hover { border-color: var(--accent); color: var(--accent); }
.author-chip .c { font-size: 0.76rem; color: var(--ink-faint); }

.alpha-nav { display: flex; flex-wrap: wrap; gap: 0.45rem; font-family: var(--font-ui); margin-bottom: 1.2rem; }
.alpha-nav a {
  display: inline-block;
  min-width: 1.8rem;
  text-align: center;
  padding: 0.22rem 0.4rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--surface);
  text-decoration: none;
  font-size: 0.85rem;
}
.alpha-nav a:hover { border-color: var(--accent); background: var(--accent-soft); }
.alpha-group { margin-top: 1.6rem; }
.alpha-title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  border-bottom: 2px solid var(--rule-strong);
  margin: 0 0 0.4rem;
}
.author-columns {
  list-style: none;
  margin: 0;
  padding: 0;
  columns: 3 16rem;
  column-gap: 2rem;
}
.author-columns li { break-inside: avoid; border-bottom: 1px solid var(--rule); }
.author-columns a {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.45rem 0.2rem;
  text-decoration: none;
  color: var(--ink);
}
.author-columns a:hover { color: var(--accent); }
.author-columns .d { font-family: var(--font-ui); font-size: 0.78rem; color: var(--ink-faint); }

/* ---------- Search Bar ---------- */
.editorial-search-form {
  display: flex;
  gap: 0.6rem;
  max-width: 38rem;
  margin: 0 auto 2rem;
}
.editorial-search-form input[type="text"] {
  flex: 1;
  padding: 0.7rem 1rem;
  font-family: var(--font-ui);
  font-size: 0.98rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--rule-strong);
  border-radius: 6px;
}
.editorial-search-form button {
  padding: 0.7rem 1.35rem;
  font-family: var(--font-ui);
  font-size: 0.92rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 6px;
  cursor: pointer;
}
.editorial-search-form button:hover { background: var(--link-hover); }

/* ---------- Pagination ---------- */
.sh-pagination {
  margin: 1.8rem 0 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  justify-content: center;
  align-items: center;
  font-family: var(--font-ui);
  font-size: 0.85rem;
}
.sh-pagination a,
.sh-pagination .sh-page-current {
  display: inline-block;
  padding: 0.32rem 0.68rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
}
.sh-pagination a:hover { border-color: var(--accent); color: var(--accent); }
.sh-pagination .sh-page-current {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  font-weight: 600;
}

/* ---------- Hộp thư collapsible year groups ---------- */
.year-group {
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--surface);
  box-shadow: var(--shadow);
  margin-bottom: 0.9rem;
  overflow: hidden;
}
.year-title {
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  padding: 0.75rem 1.1rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  user-select: none;
}
.year-title:hover { color: var(--accent); }
.year-count {
  font-family: var(--font-ui);
  font-size: 0.76rem;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}
.year-group .article-list { border-top: 1px solid var(--rule); }
.year-group .article-list li:last-child { border-bottom: none; }
.year-group .article-list a { padding: 0.58rem 1.1rem; }

/* ---------- Footer ---------- */
.site-footer {
  border-top: 3px double var(--rule-strong);
  margin-top: 3rem;
  padding: 2rem 1.25rem 3rem;
  text-align: center;
  color: var(--ink-faint);
  font-family: var(--font-ui);
  font-size: 0.82rem;
}
.site-footer .foot-brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink-soft);
  margin-bottom: 0.3rem;
}
.site-footer p { margin: 0.35rem 0; }

/* ---------- Print ---------- */
@media print {
  .masthead nav, .editorial-arrow-bar, .article-footer-nav, .site-footer { display: none !important; }
  body { background: #fff !important; color: #000 !important; }
  .article-body a { color: inherit; text-decoration: none; }
}