/* ==========================================================================
   AURIX — Bài viết dài
   Ưu tiên dễ đọc: dòng ngắn, khoảng thở rộng, tương phản đủ trên nền tối.
   ========================================================================== */

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px solid var(--line-soft);
  font-size: 13.5px;
  color: var(--fg-mute);
}

/* ---------- Mục lục ---------- */
.prose-toc {
  padding: 24px 28px;
  margin-bottom: 44px;
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--surface);
}
.prose-toc .toc-title {
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-300);
  margin: 0 0 14px;
  font-weight: 600;
}
.prose-toc ol {
  margin: 0;
  padding-left: 20px;
  display: grid;
  gap: 9px;
  color: var(--fg-mute);
  font-size: 15px;
}
.prose-toc a { color: var(--fg-soft); transition: color 0.25s var(--ease); }
.prose-toc a:hover { color: var(--gold-300); }

/* ---------- Thân bài ---------- */
.prose {
  font-size: 17.5px;
  line-height: 1.82;
  color: var(--fg-soft);
}

.prose h2 {
  font-size: clamp(23px, 2.9vw, 32px);
  color: var(--fg);
  margin: 56px 0 20px;
  scroll-margin-top: 104px;
}
.prose h2:first-child { margin-top: 0; }

.prose p { margin: 0 0 22px; max-width: 68ch; }
.prose p + h2 { margin-top: 52px; }

.prose strong { color: var(--fg); font-weight: 600; }

/* Danh sách có dấu tia lửa thương hiệu thay cho chấm tròn */
.prose-list {
  list-style: none;
  padding: 0;
  margin: 0 0 26px;
  display: grid;
  gap: 14px;
  max-width: 68ch;
}
.prose-list li {
  position: relative;
  padding-left: 26px;
}
.prose-list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 11px;
  height: 11px;
  background: var(--gold-grad);
  -webkit-mask: var(--spark-mask, url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M13.6 1 3 14.2h6.2L8.1 23 19 9.6h-6.4L13.6 1Z'/%3E%3C/svg%3E")) center/contain no-repeat;
  mask: var(--spark-mask, url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M13.6 1 3 14.2h6.2L8.1 23 19 9.6h-6.4L13.6 1Z'/%3E%3C/svg%3E")) center/contain no-repeat;
}

/* ---------- Công thức ---------- */
.prose-formula {
  padding: 22px 26px;
  margin: 0 0 26px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(212, 175, 55, 0.055);
  font-family: var(--font-serif);
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.6;
  color: var(--gold-300);
  text-align: center;
  max-width: none;
}

/* ---------- Bảng ---------- */
.prose-table-wrap {
  overflow-x: auto;
  margin: 0 0 30px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
}
.prose-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15.5px;
  min-width: 420px;
}
.prose-table th {
  text-align: left;
  padding: 15px 18px;
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--gold-300);
  font-weight: 600;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--line-soft);
  white-space: nowrap;
}
.prose-table td {
  padding: 14px 18px;
  border-bottom: 1px solid rgba(244, 246, 250, 0.05);
  color: var(--fg-soft);
}
.prose-table tr:last-child td { border-bottom: 0; }
.prose-table tbody tr:last-child td { color: var(--fg); font-weight: 600; }
.prose-table td:last-child { white-space: nowrap; }

/* ---------- Khối kêu gọi trong bài ---------- */
.prose-cta {
  margin: 40px 0 0;
  padding: 26px 30px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    radial-gradient(90% 130% at 50% 0%, rgba(212, 175, 55, 0.1) 0%, transparent 62%),
    var(--ink-700);
}
.prose-cta p { margin: 0 0 18px; color: var(--fg); max-width: 60ch; }

.prose-services {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--line-soft);
}

/* ---------- Thẻ bài viết ---------- */
.art-card {
  display: flex;
  flex-direction: column;
  padding: clamp(26px, 3vw, 34px);
  border-radius: var(--radius);
  border: 1px solid var(--line-soft);
  background: var(--surface);
  transition: border-color 0.5s var(--ease), transform 0.5s var(--ease), background 0.5s var(--ease);
}
.art-card:hover {
  border-color: var(--line);
  background: var(--surface-2);
  transform: translateY(-4px);
}
.art-topic {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-300);
  margin: 0 0 14px;
  font-weight: 600;
}
.art-card h3 {
  font-size: clamp(19px, 2.2vw, 24px);
  margin: 0 0 12px;
  color: var(--fg);
}
.art-excerpt {
  font-size: 15.5px;
  color: var(--fg-soft);
  margin: 0;
  line-height: 1.7;
}
.art-foot {
  display: flex;
  gap: 9px;
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--line-soft);
  font-size: 13px;
  color: var(--fg-mute);
}

/* ---------- Tiêu đề cấp ba ---------- */
.prose h3 {
  font-size: clamp(18px, 2.1vw, 21px);
  color: var(--fg);
  margin: 38px 0 14px;
  scroll-margin-top: 104px;
}

/* ---------- Các bước, có số thứ tự ---------- */
.prose-steps {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0 0 30px;
  display: grid;
  gap: 18px;
}
.prose-steps li {
  counter-increment: step;
  position: relative;
  padding: 18px 22px 18px 62px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--surface);
}
.prose-steps li::before {
  content: counter(step);
  position: absolute;
  left: 20px;
  top: 17px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line);
  color: var(--gold-300);
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.prose-steps .step-t {
  margin: 0 0 4px;
  color: var(--fg);
  font-weight: 600;
  font-size: 16.5px;
}
.prose-steps .step-d { margin: 0; font-size: 16px; }

/* ---------- Ghi chú bên lề ---------- */
.prose-note {
  margin: 0 0 30px;
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold-300);
  background: var(--surface);
}
.prose-note.note-warn { border-left-color: #E0806A; }
.prose-note .note-label {
  margin: 0 0 6px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--gold-300);
}
.prose-note.note-warn .note-label { color: #E0806A; }
.prose-note p:last-child { margin: 0; font-size: 16.5px; }

/* ---------- Trích dẫn ---------- */
.prose-quote {
  margin: 0 0 32px;
  padding: 4px 0 4px 26px;
  border-left: 2px solid var(--line);
}
.prose-quote p {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.3vw, 23px);
  line-height: 1.6;
  color: var(--fg);
}
.prose-quote cite {
  font-style: normal;
  font-size: 13.5px;
  color: var(--fg-mute);
}

/* ---------- Câu hỏi thường gặp trong bài ---------- */
.prose-faq { margin-bottom: 30px; }
.prose-faq h2 { margin-bottom: 22px; }

/* ---------- Bài trước, bài sau ---------- */
.art-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--line-soft);
}
.art-nav-item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 22px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}
.art-nav-item:hover { border-color: var(--line); background: var(--surface-2); }
.art-nav-item.next { text-align: right; }
.art-nav-item .dir {
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--gold-300);
}
.art-nav-item .t { color: var(--fg); font-size: 16.5px; line-height: 1.5; }
@media (max-width: 620px) {
  .art-nav { grid-template-columns: minmax(0, 1fr); }
  .art-nav-item.next { text-align: left; }
}

/* ---------- Thanh lọc và tìm kiếm ở trang danh sách ---------- */
.kb-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 20px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 26px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line-soft);
}
.kb-chips { display: flex; flex-wrap: wrap; gap: 9px; }
.kb-chips .chip .n {
  margin-left: 5px;
  font-size: 11.5px;
  color: var(--fg-mute);
  font-variant-numeric: tabular-nums;
}
.kb-chips .chip[aria-pressed='true'] .n { color: inherit; opacity: 0.7; }

.kb-search { flex: 0 1 300px; min-width: 220px; }
.kb-search input {
  width: 100%;
  padding: 11px 16px;
  border-radius: 999px;
  border: 1px solid var(--line-soft);
  background: var(--surface);
  color: var(--fg);
  font: inherit;
  font-size: 14.5px;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.kb-search input::placeholder { color: var(--fg-mute); }
.kb-search input:focus {
  outline: none;
  border-color: var(--line);
  background: var(--surface-2);
}

.kb-topic-note {
  margin: -8px 0 26px;
  font-size: 15px;
  color: var(--fg-mute);
}

/* ---------- Bài mở đầu ---------- */
.art-feature {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 210px;
  gap: 24px;
  align-items: stretch;
  padding: clamp(28px, 3.4vw, 42px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(212, 175, 55, 0.06), rgba(255, 255, 255, 0.02));
  transition: transform 0.5s var(--ease), border-color 0.5s var(--ease);
}
.art-feature:hover { transform: translateY(-4px); }
.art-feature h2 {
  font-size: clamp(24px, 3.2vw, 36px);
  color: var(--fg);
  margin: 0 0 14px;
  line-height: 1.25;
}
.af-excerpt {
  font-size: 16.5px;
  color: var(--fg-soft);
  line-height: 1.75;
  margin: 0;
  max-width: 62ch;
}
.art-feature .art-foot { margin-bottom: 18px; }
.af-side {
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 10px;
  border-left: 1px solid var(--line-soft);
}
.af-letter {
  font-size: 64px;
  line-height: 1;
  font-weight: 300;
  color: var(--gold-300);
  opacity: 0.85;
}
.af-letter-note {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--fg-mute);
  text-align: center;
  line-height: 1.7;
}
@media (max-width: 860px) {
  .art-feature { grid-template-columns: minmax(0, 1fr); }
  .af-side { display: none; }
}

/* ---------- Bổ sung cho thẻ bài viết ---------- */
.art-topic {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.art-level {
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--fg-mute);
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  padding: 3px 9px;
}
.art-foot .art-layer {
  margin-left: auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--line-soft);
  color: var(--gold-300);
  font-size: 11px;
}