/* =========================================================
   永乐高指南 · 共享样式 /assets/site.css
   深墨蓝底 + 奶油纸面 + 暖金强调的档案手册体系
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body,
h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dd, dt {
  margin: 0;
}

ul, ol { padding: 0; list-style: none; }

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

button, input, select, textarea { font: inherit; color: inherit; }

button { background: none; border: 0; }

a { color: inherit; text-decoration: none; }

table { border-collapse: collapse; border-spacing: 0; }

input[type="search"]::-webkit-search-cancel-button,
input[type="search"]::-webkit-search-decoration { -webkit-appearance: none; appearance: none; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #08182A;
  --ink-700: #12283E;
  --ink-500: #1E3A55;
  --parchment-100: #F5F0E6;
  --parchment-300: #E3D9C6;
  --gold-500: #D9A63C;
  --gold-200: #F0D69A;
  --celadon-500: #6FA39B;
  --cinnabar-600: #A8432A;
  --cinnabar-300: #E3A38E;
  --text-ink: #221E1A;
  --text-mist: #E9E4D8;

  --font-display: "Source Han Sans SC", "Noto Sans CJK SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
  --font-serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", "SimSun", Georgia, serif;
  --font-body: var(--font-serif);

  --fs-12: 0.75rem;
  --fs-14: 0.875rem;
  --fs-17: 1.0625rem;
  --fs-21: 1.3125rem;
  --fs-28: 1.75rem;
  --fs-40: 2.5rem;
  --fs-56: 3.5rem;

  --shell-max: 1200px;
  --gutter: clamp(18px, 4vw, 40px);
  --radius-s: 4px;
  --radius-m: 10px;
  --radius-l: 18px;

  --hair: 1px solid rgba(227, 217, 198, 0.16);
  --hair-strong: 1px solid rgba(227, 217, 198, 0.3);

  --shadow-deep: 0 24px 60px -30px rgba(0, 0, 0, 0.85);
  --shadow-lift: 0 18px 40px -22px rgba(0, 0, 0, 0.7);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100%;
  background-color: var(--ink-900);
  color: var(--text-mist);
  font-family: var(--font-body);
  font-size: var(--fs-17);
  line-height: 1.85;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(2rem, 5vw, var(--fs-56)); }
h2 { font-size: clamp(1.5rem, 3vw, 2.125rem); }
h3 { font-size: var(--fs-21); }
h4 { font-size: var(--fs-17); }

strong { font-weight: 700; }

code, .num, .serial {
  font-family: var(--font-serif);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.06em;
}

:focus-visible {
  outline: 2px solid var(--gold-200);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---------- 4. 布局工具 ---------- */
.shell {
  width: 100%;
  max-width: calc(var(--shell-max) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.stack { display: flex; flex-direction: column; }
.stack-2 { display: flex; flex-direction: column; gap: clamp(10px, 1.4vw, 16px); }
.stack-4 { display: flex; flex-direction: column; gap: clamp(18px, 2.6vw, 30px); }

.lead { font-size: var(--fs-21); line-height: 1.75; }

.muted { color: rgba(233, 228, 216, 0.62); }

.text-gold { color: var(--gold-500); }

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, rgba(217, 166, 60, 0.5), transparent);
}

/* ---------- 5. Skip link ---------- */
.skip-link {
  position: absolute;
  left: 50%;
  top: 0;
  z-index: 400;
  transform: translate(-50%, -140%);
  background: var(--gold-500);
  color: #1a1206;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  padding: 10px 22px;
  border-radius: 0 0 10px 10px;
  transition: transform 0.2s ease;
}

.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 6. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 20;
  overflow: hidden;
  padding-block: clamp(18px, 2.6vw, 32px) 0;
  background:
    radial-gradient(120% 150% at 50% -45%, rgba(217, 166, 60, 0.18), transparent 62%),
    linear-gradient(180deg, var(--ink-700) 0%, var(--ink-900) 100%);
  border-bottom: 1px solid rgba(217, 166, 60, 0.32);
}

.header-aura {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.5;
  background-image:
    linear-gradient(rgba(233, 228, 216, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 228, 216, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 78%);
}

.masthead {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  grid-template-areas: "meta brand search";
  align-items: center;
  gap: clamp(14px, 2vw, 30px);
}

.masthead-meta {
  grid-area: meta;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.issue-tag {
  font-family: var(--font-serif);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--gold-500);
}

.masthead-sub {
  font-family: var(--font-display);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  color: rgba(233, 228, 216, 0.58);
}

.brand {
  grid-area: brand;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  letter-spacing: 0.14em;
  color: var(--parchment-100);
  text-shadow: 0 0 34px rgba(217, 166, 60, 0.3);
}

.brand::after {
  content: "";
  width: 60px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-500), transparent);
}

/* 检索入口 */
.search-deck {
  grid-area: search;
  justify-self: end;
  position: relative;
  width: min(100%, 330px);
}

.search-label {
  display: block;
  font-family: var(--font-display);
  font-size: var(--fs-12);
  font-weight: 700;
  letter-spacing: 0.16em;
  color: rgba(233, 228, 216, 0.68);
  margin-bottom: 7px;
}

.search-field {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 4px 4px 16px;
  border: 1px solid rgba(227, 217, 198, 0.24);
  border-radius: 999px;
  background: rgba(8, 24, 42, 0.75);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}

.search-field:focus-within {
  border-color: var(--gold-500);
  box-shadow: 0 0 0 1px rgba(217, 166, 60, 0.35), 0 0 28px rgba(217, 166, 60, 0.24);
}

.search-input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  padding: 9px 0;
  font-family: var(--font-serif);
  font-size: var(--fs-14);
  color: var(--text-mist);
  outline: none;
}

.search-input::placeholder { color: rgba(233, 228, 216, 0.42); }

.search-go {
  flex: none;
  cursor: pointer;
  padding: 9px 18px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--gold-200), var(--gold-500));
  color: #1a1206;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.search-go:hover { transform: translateY(-1px); filter: brightness(1.08); }

.search-hint {
  margin-top: 7px;
  font-family: var(--font-serif);
  font-size: var(--fs-12);
  color: rgba(233, 228, 216, 0.46);
}

.search-results {
  display: none;
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  right: 0;
  z-index: 60;
  max-height: 336px;
  overflow-y: auto;
  padding: 6px;
  border: 1px solid var(--parchment-300);
  border-radius: var(--radius-m);
  background: var(--parchment-100);
  color: var(--text-ink);
  box-shadow: 0 24px 48px -20px rgba(0, 0, 0, 0.75);
}

.search-results[data-open] { display: block; }

.search-results li + li { border-top: 1px solid rgba(34, 30, 26, 0.08); }

.search-results li a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 8px;
  font-size: var(--fs-14);
  color: var(--text-ink);
  transition: background-color 0.18s ease;
}

.search-results li a:hover,
.search-results li a:focus-visible { background: var(--parchment-300); }

.search-result-title {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.search-result-kind {
  flex: none;
  padding: 1px 9px;
  border: 1px solid var(--cinnabar-300);
  border-radius: 999px;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--cinnabar-600);
}

.search-empty {
  padding: 14px 12px;
  font-size: var(--fs-14);
  color: #55503f;
}

/* 栏目带 */
.nav-bar {
  position: relative;
  margin-top: clamp(16px, 2.4vw, 28px);
  padding-block: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-top: var(--hair);
  border-bottom: var(--hair);
}

.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 11px 18px;
  cursor: pointer;
  border: 1px solid rgba(227, 217, 198, 0.28);
  border-radius: 999px;
  background: rgba(18, 40, 62, 0.7);
  color: var(--text-mist);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.1em;
}

.nav-toggle-icon {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 2px;
  background: var(--gold-500);
  transition: background-color 0.2s ease;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--gold-500);
  transition: transform 0.25s ease;
}

.nav-toggle-icon::before { top: -5px; }
.nav-toggle-icon::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-icon { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { transform: translateY(-5px) rotate(-45deg); }

.site-nav { width: 100%; }

.nav-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(6px, 2.2vw, 30px);
}

.nav-list a {
  position: relative;
  display: inline-block;
  padding: 9px 2px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  color: rgba(233, 228, 216, 0.8);
  transition: color 0.2s ease;
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--gold-500), transparent);
  transform: scaleX(0);
  transform-origin: center;
  transition: transform 0.28s ease;
}

.nav-list a:hover { color: var(--parchment-100); }
.nav-list a:hover::after { transform: scaleX(1); }

.nav-list a[aria-current="page"] { color: var(--gold-500); }
.nav-list a[aria-current="page"]::after { transform: scaleX(1); }

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  padding-block: clamp(38px, 5vw, 68px) 0;
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-700) 100%);
  border-top: 1px solid rgba(217, 166, 60, 0.28);
  color: rgba(233, 228, 216, 0.8);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2fr);
  gap: clamp(26px, 4vw, 60px);
}

.footer-brand { display: flex; flex-direction: column; gap: 8px; }

.footer-issue {
  font-family: var(--font-serif);
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--gold-500);
}

.footer-brand-name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--fs-28);
  letter-spacing: 0.1em;
  color: var(--parchment-100);
}

.footer-signature {
  font-size: var(--fs-14);
  color: rgba(233, 228, 216, 0.58);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 2.6vw, 34px);
}

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--parchment-300);
}

.footer-col ul { display: flex; flex-direction: column; gap: 10px; }

.footer-col a {
  display: inline-block;
  font-size: var(--fs-14);
  color: rgba(233, 228, 216, 0.74);
  transition: color 0.2s ease, transform 0.2s ease;
}

.footer-col a:hover { color: var(--gold-500); transform: translateX(3px); }

.footer-contact {
  margin-top: clamp(30px, 4vw, 50px);
  padding-top: clamp(20px, 3vw, 32px);
  border-top: var(--hair);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.footer-contact-item { display: flex; flex-direction: column; gap: 5px; }

.footer-contact-item--wide { grid-column: 1 / -1; }

.footer-contact dt {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.16em;
  color: var(--gold-500);
}

.footer-contact dd {
  font-size: var(--fs-14);
  color: rgba(233, 228, 216, 0.76);
  word-break: break-word;
}

.footer-legal {
  margin-top: clamp(24px, 3vw, 38px);
  padding-block: 18px;
  border-top: var(--hair);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 26px;
  font-size: var(--fs-12);
  color: rgba(233, 228, 216, 0.5);
}

.footer-legal-icp { letter-spacing: 0.08em; }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-14);
  letter-spacing: 0.08em;
  transition: transform 0.2s ease, color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.btn--gold {
  background: linear-gradient(180deg, var(--gold-200), var(--gold-500));
  color: #1a1206;
  box-shadow: 0 14px 32px -16px rgba(217, 166, 60, 0.9);
}

.btn--gold:hover { transform: translateY(-2px); }

.btn--ghost {
  border-color: rgba(227, 217, 198, 0.36);
  background: rgba(18, 40, 62, 0.5);
  color: var(--parchment-100);
}

.btn--ghost:hover { border-color: var(--gold-500); color: var(--gold-500); }

.btn--paper {
  background: var(--parchment-100);
  color: var(--text-ink);
  border-color: var(--parchment-300);
}

.btn--paper:hover { transform: translateY(-2px); }

/* ---------- 9. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border: 1px solid currentColor;
  border-radius: 999px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.tag--live { color: var(--celadon-500); }
.tag--warn { color: var(--cinnabar-300); background: rgba(168, 67, 42, 0.22); }
.tag--gold { color: var(--gold-500); }
.tag--ink { color: rgba(233, 228, 216, 0.7); border-color: rgba(233, 228, 216, 0.3); }

/* ---------- 10. 卡面 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.4vw, 28px);
  border: var(--hair);
  border-radius: var(--radius-m);
  background: linear-gradient(180deg, rgba(30, 58, 85, 0.62), rgba(18, 40, 62, 0.9));
  box-shadow: var(--shadow-lift);
}

.card--paper {
  background: var(--parchment-100);
  border-color: var(--parchment-300);
  color: var(--text-ink);
  box-shadow: 0 18px 42px -26px rgba(0, 0, 0, 0.6);
}

.card--paper p { color: #4a4239; }
.card--paper h3 { color: var(--text-ink); }

.card--glass {
  background: rgba(30, 58, 85, 0.34);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(227, 217, 198, 0.22);
}

/* ---------- 11. Bento 网格 ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 22px);
}

.bento > * { min-width: 0; }

.b-2x1 { grid-column: span 2; }
.b-1x2 { grid-row: span 2; }
.b-2x2 { grid-column: span 2; grid-row: span 2; }
.b-full { grid-column: 1 / -1; }

/* ---------- 12. 区块与标题 ---------- */
.section { padding-block: clamp(44px, 6.5vw, 92px); }

.section--ink { background: var(--ink-700); }

.section--paper {
  background: var(--parchment-100);
  color: var(--text-ink);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 78ch;
  margin-bottom: clamp(24px, 3.4vw, 46px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.24em;
  color: var(--gold-500);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  line-height: 1.26;
  color: var(--parchment-100);
}

.section--paper .section-title { color: var(--text-ink); }

.section-lede {
  max-width: 64ch;
  font-size: var(--fs-17);
  color: rgba(233, 228, 216, 0.78);
}

.section--paper .section-lede { color: #4a4239; }

/* ---------- 13. 正文容器 ---------- */
.prose {
  max-width: 72ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: rgba(233, 228, 216, 0.86);
}

.section--paper .prose,
.card--paper .prose { color: var(--text-ink); }

.prose p + p { margin-top: 1.1em; }

.prose h3 {
  margin-top: 1.9em;
  margin-bottom: 0.55em;
  color: var(--gold-200);
}

.section--paper .prose h3 { color: var(--text-ink); }

.prose ul, .prose ol {
  margin-top: 0.9em;
  display: flex;
  flex-direction: column;
  gap: 0.55em;
}

.prose li {
  position: relative;
  padding-left: 1.4em;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--gold-500);
}

.prose a { color: var(--gold-200); border-bottom: 1px solid rgba(240, 214, 154, 0.5); }
.section--paper .prose a { color: var(--cinnabar-600); border-bottom-color: var(--cinnabar-300); }

/* ---------- 14. 非对称分栏与锚点目录 ---------- */
.split {
  display: grid;
  grid-template-columns: minmax(0, 268px) minmax(0, 1fr);
  gap: clamp(26px, 4.2vw, 60px);
  align-items: start;
}

.anchor-rail {
  position: sticky;
  top: 26px;
  padding-left: 20px;
  border-left: 1px solid rgba(227, 217, 198, 0.22);
}

.section--paper .anchor-rail { border-left-color: rgba(34, 30, 26, 0.16); }

.anchor-rail-title {
  margin-bottom: 14px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.2em;
  color: var(--gold-500);
}

.anchor-list { display: flex; flex-direction: column; gap: 11px; }

.anchor-list a {
  display: inline-block;
  font-size: var(--fs-14);
  color: rgba(233, 228, 216, 0.7);
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.section--paper .anchor-list a { color: #5a5348; }

.anchor-list a:hover { color: var(--gold-200); }

.anchor-list a[aria-current="location"] {
  color: var(--gold-500);
  border-bottom-color: var(--gold-500);
}

/* ---------- 15. 时间线 ---------- */
.timeline {
  position: relative;
  margin-left: 6px;
  padding-left: clamp(20px, 2.6vw, 32px);
  border-left: 2px solid rgba(227, 217, 198, 0.18);
  display: flex;
  flex-direction: column;
}

.timeline-item {
  position: relative;
  padding-bottom: clamp(20px, 2.8vw, 32px);
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(20px, 2.6vw, 32px) - 7px);
  top: 9px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--gold-500);
  border-radius: 50%;
  background: var(--ink-900);
}

.timeline-item[data-state="done"]::before {
  background: var(--celadon-500);
  border-color: var(--celadon-500);
}

.timeline-item[data-state="warn"]::before {
  background: var(--cinnabar-600);
  border-color: var(--cinnabar-600);
}

.timeline-date {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-serif);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--gold-500);
}

.timeline-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-17);
  color: var(--parchment-100);
}

.timeline-text {
  margin-top: 4px;
  font-size: var(--fs-14);
  color: rgba(233, 228, 216, 0.72);
}

/* ---------- 16. 编号步骤卡 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.7vw, 20px);
}

.step-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2vw, 26px);
  border: 1px solid var(--parchment-300);
  border-top: 3px solid var(--gold-500);
  border-radius: var(--radius-m);
  background: var(--parchment-100);
  color: var(--text-ink);
}

.step-num {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: var(--fs-40);
  line-height: 1;
  color: var(--gold-500);
  font-variant-numeric: tabular-nums;
}

.step-card h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-17);
  color: var(--text-ink);
}

.step-card p {
  font-size: var(--fs-14);
  line-height: 1.8;
  color: #4a4239;
}

/* ---------- 17. 表格与筛选 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--parchment-300);
  border-radius: var(--radius-m);
  background: var(--parchment-100);
  color: var(--text-ink);
}

.data-table {
  width: 100%;
  min-width: 520px;
  font-size: var(--fs-14);
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 13px 16px;
  border-bottom: 1px solid rgba(34, 30, 26, 0.12);
  vertical-align: top;
}

.data-table thead th {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: #6a6152;
  background: var(--parchment-300);
}

.data-table tbody tr:last-child td { border-bottom: 0; }

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.filter-chip {
  padding: 7px 15px;
  cursor: pointer;
  border: 1px solid rgba(227, 217, 198, 0.3);
  border-radius: 999px;
  background: transparent;
  color: rgba(233, 228, 216, 0.76);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.filter-chip:hover { border-color: var(--gold-500); color: var(--gold-200); }

.filter-chip[aria-pressed="true"] {
  background: var(--gold-500);
  border-color: var(--gold-500);
  color: #1a1206;
}

/* ---------- 18. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: var(--fs-12);
  color: rgba(233, 228, 216, 0.6);
}

.breadcrumbs li { display: inline-flex; align-items: center; }

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(233, 228, 216, 0.34);
}

.breadcrumbs a:hover { color: var(--gold-500); }

.breadcrumbs--paper { color: #6a6152; }
.breadcrumbs--paper li + li::before { color: rgba(34, 30, 26, 0.3); }
.breadcrumbs--paper a:hover { color: var(--cinnabar-600); }

/* ---------- 19. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(227, 217, 198, 0.2);
  border-radius: var(--radius-m);
  background: linear-gradient(135deg, var(--ink-700), var(--ink-500));
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(233, 228, 216, 0.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(233, 228, 216, 0.07) 1px, transparent 1px);
  background-size: 38px 38px;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--filled::after { display: none; }

.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame-caption {
  margin-top: 9px;
  font-size: var(--fs-12);
  line-height: 1.7;
  color: rgba(233, 228, 216, 0.6);
}

.section--paper .media-frame-caption { color: #6a6152; }

/* ---------- 20. 滚动进度与回到顶部 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 300;
  pointer-events: none;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--celadon-500), var(--gold-500) 55%, var(--cinnabar-600));
}

.to-top {
  position: fixed;
  right: clamp(14px, 2.4vw, 26px);
  bottom: clamp(14px, 2.4vw, 26px);
  z-index: 290;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  cursor: pointer;
  border: 1px solid rgba(217, 166, 60, 0.5);
  border-radius: 50%;
  background: rgba(18, 40, 62, 0.9);
  color: var(--gold-500);
  font-size: var(--fs-17);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.28s ease, transform 0.28s ease, visibility 0.28s ease;
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover { background: var(--ink-500); }

/* ---------- 21. 滚动显现 ---------- */
html[data-reveal-ready] .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.22, 0.8, 0.32, 1);
  transition-delay: calc(var(--stagger, 0) * 70ms);
  will-change: opacity, transform;
}

html[data-reveal-ready] .reveal.is-in {
  opacity: 1;
  transform: none;
}

/* ---------- 22. 响应式 ---------- */
@media (max-width: 1080px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "meta brand"
      "search search";
  }

  .search-deck {
    justify-self: stretch;
    width: 100%;
    max-width: 540px;
  }
}

@media (max-width: 900px) {
  .bento { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .b-2x1 { grid-column: span 2; }
  .b-2x2 { grid-column: span 2; grid-row: span 1; }
  .b-1x2 { grid-row: span 1; }

  .split { grid-template-columns: minmax(0, 1fr); }

  .anchor-rail {
    position: static;
    padding-left: 16px;
  }

  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "brand"
      "meta"
      "search";
    justify-items: center;
    text-align: center;
  }

  .masthead-meta { align-items: center; }
  .search-deck { justify-self: stretch; max-width: none; }
  .search-label { text-align: left; }

  .nav-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 10px;
  }

  .nav-toggle { display: flex; }

  .site-nav { display: none; }

  .site-nav[data-open] {
    display: block;
    animation: nav-in 0.28s ease both;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin-top: 10px;
    padding-block: 4px;
    border-top: var(--hair);
  }

  .nav-list li + li { border-top: 1px solid rgba(227, 217, 198, 0.12); }

  .nav-list a { display: block; padding: 14px 4px; }

  .nav-list a::after { display: none; }

  .nav-list a[aria-current="page"] {
    background: linear-gradient(90deg, rgba(217, 166, 60, 0.18), transparent);
  }

  .nav-list a[aria-current="page"]::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    margin-right: 10px;
    border-radius: 50%;
    background: var(--gold-500);
    vertical-align: middle;
  }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
}

@keyframes nav-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 640px) {
  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal { justify-content: flex-start; }
}

@media (max-width: 560px) {
  .bento { grid-template-columns: minmax(0, 1fr); }
  .b-2x1, .b-2x2, .b-full { grid-column: span 1; grid-row: span 1; }

  .steps { grid-template-columns: minmax(0, 1fr); }

  .search-go { padding: 9px 14px; }

  .search-results { position: static; margin-top: 10px; max-height: 260px; }
}

/* ---------- 23. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    transition-delay: 0ms !important;
  }

  html[data-reveal-ready] .reveal,
  html[data-reveal-ready] .reveal.is-in {
    opacity: 1;
    transform: none;
  }

  .scroll-progress { display: none; }
}