/* ============================================================
   豪门娱乐会馆 · 共享样式表 /assets/site.css
   头部 / 页脚 / 变量 / 排版 / 通用组件
   ============================================================ */

/* ---------- 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, figure, blockquote, dl, dd, ul, ol { margin: 0; }

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

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

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

button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }

table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid var(--gold-bright);
  outline-offset: 3px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B0B0D;
  --ink-2: #141418;
  --ink-3: #050506;

  --gold: #C9A227;
  --gold-bright: #E8C766;
  --gold-deep: #8A6E18;

  --crimson: #8B1E3F;
  --crimson-dark: #5C1429;

  --silver: #C0C0C8;
  --silver-dim: #9A9AA4;
  --deco: #6E6E78;
  --cream: #F2E6C4;

  --line: rgba(201, 162, 39, 0.30);
  --line-soft: rgba(192, 192, 200, 0.16);
  --line-crimson: rgba(139, 30, 63, 0.55);

  --shadow-hard: 10px 10px 0 rgba(5, 5, 6, 0.92);
  --shadow-soft: 0 22px 48px -26px rgba(0, 0, 0, 0.92);
  --shadow-gold: 0 18px 38px -20px rgba(201, 162, 39, 0.72);

  --rail-w: 104px;
  --shell: 1440px;
  --narrow: 720px;
  --gutter: clamp(18px, 4vw, 56px);

  --font-display: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', 'SimSun', serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-body: 'Noto Sans SC', 'PingFang SC', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  --ease: cubic-bezier(.2, .7, .3, 1);
  --header-z: 60;
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--ink);
  background-image:
    radial-gradient(1100px 620px at 82% -12%, rgba(139, 30, 63, 0.22), transparent 68%),
    radial-gradient(900px 520px at 4% 4%, rgba(201, 162, 39, 0.10), transparent 70%);
  background-repeat: no-repeat;
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.85;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main { display: block; flex: 1 0 auto; width: 100%; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  color: var(--cream);
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(42px, 8vw, 112px); line-height: 1.02; }
h2 { font-size: clamp(28px, 3.6vw, 44px); line-height: 1.14; letter-spacing: -0.01em; }

h3 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.5;
  letter-spacing: 0.03em;
}

.note,
small { font-size: 13px; line-height: 1.75; color: var(--silver-dim); }

/* ---------- 4. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 14px;
  top: -72px;
  z-index: 200;
  padding: 10px 20px;
  background: var(--gold);
  color: var(--ink-3);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.08em;
  transition: top 0.2s var(--ease);
}

.skip-link:focus { top: 14px; }

/* ---------- 5. 页头：刊头 + 索引轨道 ---------- */
.site-header {
  position: relative;
  z-index: var(--header-z);
  background: var(--ink-3);
  border-bottom: 1px solid var(--line);
}

.site-header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background-image: linear-gradient(90deg, transparent, var(--gold-bright), transparent);
  background-size: 38% 100%;
  background-repeat: no-repeat;
  background-position: -40% 0;
  animation: header-sweep 7s var(--ease) infinite;
  pointer-events: none;
}

@keyframes header-sweep {
  0% { background-position: -40% 0; }
  22% { background-position: 140% 0; }
  100% { background-position: 140% 0; }
}

/* 索引轨道（仅桌面端） */
.rail { display: none; }

/* 刊头 */
.masthead {
  position: relative;
  max-width: var(--shell);
  margin-inline: auto;
  padding: 0 var(--gutter);
}

.masthead__bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 18px;
  padding: clamp(16px, 2vw, 26px) 0 clamp(12px, 1.4vw, 18px);
}

.masthead__ear {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--silver-dim);
}

.masthead__tools {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 品牌报头 */
.brand {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  text-align: center;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 44px);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--cream);
  transition: color 0.28s var(--ease);
}

.brand:hover .brand__name { color: var(--gold-bright); }

.brand__slogan {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.42em;
  text-indent: 0.42em;
  color: var(--gold);
}

/* 右上角工具入口 */
.tool-link {
  padding: 8px 12px;
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--silver);
  border: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.tool-link:hover { color: var(--gold-bright); }

.tool-link--fav {
  position: relative;
  padding-left: 28px;
  border-color: var(--gold-deep);
  color: var(--gold-bright);
  background-image: linear-gradient(180deg, rgba(201, 162, 39, 0.16), rgba(201, 162, 39, 0));
}

.tool-link--fav::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 50%;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  background: var(--gold-bright);
  transform: rotate(45deg);
  transition: background-color 0.24s var(--ease);
}

.tool-link--fav:hover {
  background: var(--gold);
  border-color: var(--gold-bright);
  color: var(--ink-3);
}

.tool-link--fav:hover::before { background: var(--ink-3); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border: 1px solid var(--line-soft);
  color: var(--silver);
  font-size: 13px;
  letter-spacing: 0.16em;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.nav-toggle:hover { color: var(--gold-bright); border-color: var(--gold-deep); }

.nav-toggle__bars { display: flex; flex-direction: column; gap: 4px; width: 18px; }

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform 0.28s var(--ease), opacity 0.28s var(--ease);
}

.site-header[data-open="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.site-header[data-open="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.nav-toggle__text { font-family: var(--font-mono); letter-spacing: 0.18em; }

/* 主导航 */
.site-nav { border-top: 1px solid var(--line-soft); }

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(8px, 2vw, 30px);
  padding: 12px 0;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 4px 2px;
  font-size: 14.5px;
  letter-spacing: 0.14em;
  color: var(--silver);
  transition: color 0.24s var(--ease);
}

.site-nav__link:hover { color: var(--cream); }

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.32s var(--ease);
}

.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--gold-bright); }

.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--gold-bright);
}

/* 阅读进度 */
.scroll-progress {
  position: fixed;
  left: 0;
  right: 0;
  top: 0;
  height: 2px;
  z-index: 80;
  background: rgba(192, 192, 200, 0.08);
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background-image: linear-gradient(90deg, var(--gold-deep), var(--gold-bright) 60%, var(--cream));
  transition: transform 0.12s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 7vw, 110px);
  background: var(--ink-3);
  border-top: 1px solid var(--line);
}

.footer__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(36px, 5vw, 72px) var(--gutter) clamp(24px, 3vw, 40px);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 48px);
}

.footer__brand { min-width: 0; }

.footer__logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 2.6vw, 32px);
  letter-spacing: 0.03em;
  color: var(--cream);
  transition: color 0.24s var(--ease);
}

.footer__logo:hover { color: var(--gold-bright); }

.footer__slogan {
  margin-top: 10px;
  font-size: 14px;
  color: var(--silver-dim);
}

.footer__cta { margin-top: 20px; }

.footer__col { min-width: 0; }

.footer__col-title {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

.footer__links {
  margin-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__link {
  display: inline-block;
  font-size: 15px;
  color: var(--silver);
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease), padding-left 0.24s var(--ease);
}

.footer__link:hover {
  color: var(--gold-bright);
  border-color: var(--gold-deep);
  padding-left: 4px;
}

.footer__link[aria-current="page"] { color: var(--gold-bright); }

.footer__contact {
  margin-top: clamp(28px, 4vw, 48px);
  padding-top: 20px;
  border-top: 1px solid var(--line-soft);
  font-size: 14px;
  color: var(--silver);
}

.footer__note {
  margin-top: 8px;
  font-size: 13px;
  color: var(--silver-dim);
}

.footer__bar {
  position: sticky;
  bottom: 0;
  z-index: 30;
  background: var(--ink-3);
  border-top: 1px solid var(--line);
}

.footer__bar-inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: 12px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--silver-dim);
}

.footer__bar-item { white-space: nowrap; }

/* ---------- 7. 容器与章节骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--narrow { max-width: var(--narrow); }

.section { padding-block: clamp(48px, 7vw, 104px); }
.section--tight { padding-block: clamp(28px, 4vw, 56px); }
.section--narrow { max-width: var(--narrow); margin-inline: auto; }

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 16px;
  margin-bottom: clamp(24px, 3vw, 44px);
  border-bottom: 1px solid var(--line);
}

.section__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 42px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

.section__lead {
  margin-top: 12px;
  max-width: 70ch;
  font-size: 16px;
  color: var(--silver-dim);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--gold);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--gold);
}

/* 框景模块 */
.frame {
  position: relative;
  padding: clamp(20px, 3vw, 44px);
  background-image: linear-gradient(180deg, rgba(20, 20, 24, 0.92), rgba(11, 11, 13, 0.62));
  border: 1px solid var(--line);
  box-shadow: var(--shadow-hard);
}

.frame::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(192, 192, 200, 0.10);
  pointer-events: none;
}

.frame--crimson { border-color: var(--line-crimson); }

.frame__meta {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--silver-dim);
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 12px 22px;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--gold-bright);
  background: rgba(11, 11, 13, 0.6);
  border: 1px solid var(--gold-deep);
  transition: background-color 0.28s var(--ease), color 0.28s var(--ease),
              transform 0.28s var(--ease), box-shadow 0.28s var(--ease), border-color 0.28s var(--ease);
}

.btn:hover,
.btn:focus-visible {
  background: var(--gold);
  border-color: var(--gold-bright);
  color: var(--ink-3);
  transform: translateY(-2px);
  box-shadow: var(--shadow-gold);
}

.btn--gold {
  background: var(--gold);
  border-color: var(--gold-bright);
  color: var(--ink-3);
  font-weight: 600;
}

.btn--gold:hover,
.btn--gold:focus-visible { background: var(--gold-bright); }

.btn--ghost {
  border-color: var(--line-soft);
  color: var(--silver);
  background: transparent;
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: transparent;
  border-color: var(--gold);
  color: var(--gold-bright);
  box-shadow: none;
}

.btn--crimson {
  background: var(--crimson-dark);
  border-color: var(--crimson);
  color: #F4D9E2;
}

.btn--crimson:hover,
.btn--crimson:focus-visible {
  background: var(--crimson);
  border-color: var(--crimson);
  color: #FFF6F8;
  box-shadow: 0 18px 38px -20px rgba(139, 30, 63, 0.8);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 26px;
}

/* ---------- 9. 网格与卡片 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.2vw, 30px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.grid--offset > *:nth-child(even) { margin-top: clamp(16px, 2.6vw, 48px); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(18px, 2vw, 26px);
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-top: 2px solid var(--gold-deep);
  box-shadow: var(--shadow-soft);
  transition: transform 0.32s var(--ease), border-color 0.32s var(--ease), box-shadow 0.32s var(--ease);
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--line);
  box-shadow: var(--shadow-hard), var(--shadow-soft);
}

.card--crimson {
  border-top-color: var(--crimson);
  background-image: linear-gradient(180deg, rgba(139, 30, 63, 0.22), rgba(20, 20, 24, 1) 62%);
}

.card__kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.card__title {
  margin-top: 10px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.2vw, 26px);
  line-height: 1.25;
}

.card__text {
  margin-top: 10px;
  font-size: 15.5px;
  color: var(--silver);
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--silver-dim);
}

/* ---------- 10. 图片容器基础规则 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background-color: var(--ink-3);
  background-image:
    repeating-linear-gradient(135deg, rgba(201, 162, 39, 0.10) 0 2px, transparent 2px 12px),
    radial-gradient(120% 120% at 78% 8%, rgba(139, 30, 63, 0.35), transparent 62%);
  border: 1px solid var(--line);
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--cream);
  background-image: linear-gradient(180deg, rgba(5, 5, 6, 0), rgba(5, 5, 6, 0.88));
}

.media--wide { aspect-ratio: 16 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 3 / 4; }
.media--hero { aspect-ratio: 21 / 9; }

/* ---------- 11. 标签 / 铭牌 / 分隔线 ---------- */
.tag {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

.tag--gold { border-color: var(--gold-deep); color: var(--gold-bright); }

.tag--crimson {
  border-color: var(--crimson);
  background: rgba(139, 30, 63, 0.25);
  color: #F4D9E2;
}

.plate {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--gold);
  font-family: var(--font-mono);
  color: var(--gold-bright);
}

.plate__num { font-size: 20px; letter-spacing: 0.06em; }

.plate__label {
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--silver-dim);
}

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(24px, 4vw, 52px);
  background-image: linear-gradient(90deg, var(--gold-deep), rgba(201, 162, 39, 0));
}

/* ---------- 12. 长文 ---------- */
.prose {
  font-size: 17px;
  line-height: 1.9;
  color: var(--cream);
}

.prose p { max-width: 74ch; }
.prose p + p { margin-top: 1.05em; }
.prose h2 { margin-top: 1.6em; margin-bottom: 0.5em; }
.prose h3 { margin-top: 1.4em; margin-bottom: 0.4em; }
.prose ul { margin: 1em 0; }

.prose li {
  position: relative;
  max-width: 72ch;
  padding-left: 22px;
  color: var(--silver);
}

.prose li + li { margin-top: 0.5em; }

.prose li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.85em;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

.prose a {
  color: var(--gold-bright);
  border-bottom: 1px solid var(--gold-deep);
}

.prose a:hover { border-color: var(--gold-bright); }

/* ---------- 13. 面包屑 ---------- */
.breadcrumbs { padding-top: 14px; }

.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--silver-dim);
}

.breadcrumbs__link { transition: color 0.24s var(--ease); }
.breadcrumbs__link:hover { color: var(--gold-bright); }
.breadcrumbs__sep { color: var(--deco); }
.breadcrumbs__item[aria-current="page"] { color: var(--cream); }

/* ---------- 14. 显现 ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.42s var(--ease), transform 0.42s var(--ease);
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 15. 可展开内容组 ---------- */
.disclosure {
  background: var(--ink-2);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold-deep);
  transition: border-color 0.28s var(--ease);
}

.disclosure + .disclosure { margin-top: 12px; }
.disclosure[data-open="true"] { border-left-color: var(--gold-bright); }

.disclosure__trigger {
  display: flex;
  width: 100%;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  text-align: left;
  font-size: 16px;
  color: var(--cream);
  transition: color 0.24s var(--ease);
}

.disclosure__trigger:hover { color: var(--gold-bright); }

.disclosure__icon {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
  margin-left: auto;
}

.disclosure__icon::before,
.disclosure__icon::after {
  content: "";
  position: absolute;
  background: var(--gold);
}

.disclosure__icon::before { left: 0; right: 0; top: 6px; height: 2px; }

.disclosure__icon::after {
  top: 0;
  bottom: 0;
  left: 6px;
  width: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.disclosure[data-open="true"] .disclosure__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.disclosure__panel {
  padding: 0 18px 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--silver);
}

.disclosure__panel > p { max-width: 74ch; }

/* ---------- 16. 桌面端索引轨道启动 ---------- */
@media (min-width: 1100px) {
  body { padding-left: var(--rail-w); }

  .rail {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: var(--rail-w);
    z-index: 40;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 18px;
    background-image: linear-gradient(180deg, #050506 0%, #0B0B0D 42%, #050506 100%);
    border-right: 1px solid var(--line);
  }

  .rail::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    right: 6px;
    width: 1px;
    background-image: linear-gradient(180deg, transparent, rgba(201, 162, 39, 0.35), transparent);
  }

  .rail__list { display: flex; flex-direction: column; gap: 6px; }

  .rail__link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px 10px;
    color: var(--silver-dim);
    border: 1px solid transparent;
    transition: color 0.28s var(--ease), background-color 0.28s var(--ease), border-color 0.28s var(--ease);
  }

  .rail__link:hover {
    color: var(--cream);
    background: rgba(201, 162, 39, 0.08);
  }

  .rail__num {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.2em;
    color: var(--gold-deep);
    transition: color 0.28s var(--ease);
  }

  .rail__label {
    writing-mode: vertical-rl;
    font-size: 14px;
    letter-spacing: 0.3em;
  }

  .rail__link:hover .rail__num,
  .rail__link[aria-current="page"] .rail__num { color: var(--gold-bright); }

  .rail__link[aria-current="page"] {
    color: var(--gold-bright);
    border-color: var(--gold-deep);
    background-image: linear-gradient(180deg, rgba(201, 162, 39, 0.16), rgba(201, 162, 39, 0));
  }

  .rail__foot {
    position: absolute;
    bottom: 26px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: 0.34em;
    color: var(--deco);
  }

  .scroll-progress { left: var(--rail-w); }
}

/* ---------- 17. 平板 ---------- */
@media (max-width: 1099px) {
  .masthead__ear { font-size: 10.5px; letter-spacing: 0.18em; }
}

@media (max-width: 1024px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 960px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ---------- 18. 移动端 ---------- */
@media (max-width: 820px) {
  body { font-size: 16px; }

  .site-header {
    position: sticky;
    top: 0;
    background: var(--ink-3);
  }

  .masthead { padding-inline: 16px; }

  .masthead__bar {
    grid-template-columns: 1fr auto;
    gap: 12px;
    padding: 12px 0;
    align-items: center;
  }

  .masthead__ear { display: none; }

  .brand {
    grid-column: 1;
    align-items: flex-start;
    gap: 4px;
    text-align: left;
  }

  .brand__name { font-size: 22px; letter-spacing: 0.06em; }
  .brand__slogan { font-size: 10px; letter-spacing: 0.36em; }

  .masthead__tools { gap: 8px; }
  .tool-link { padding: 6px 8px; font-size: 13px; }
  .tool-link--fav { padding-left: 24px; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    max-height: calc(100vh - 76px);
    overflow-y: auto;
    background: var(--ink-3);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
  }

  .site-nav[data-open="true"] { display: block; }

  .site-nav__list {
    flex-direction: column;
    gap: 0;
    padding: 6px 0;
  }

  .site-nav__item { border-bottom: 1px solid rgba(192, 192, 200, 0.08); }

  .site-nav__link {
    display: block;
    padding: 14px 20px;
    font-size: 15px;
  }

  .site-nav__link::after { display: none; }

  .site-nav__link[aria-current="page"] {
    background: rgba(201, 162, 39, 0.08);
    box-shadow: inset 3px 0 0 var(--gold);
  }

  .media--hero { aspect-ratio: 16 / 10; }
  .media--tall { aspect-ratio: 4 / 5; }
}

@media (max-width: 680px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .grid--offset > *:nth-child(even) { margin-top: 0; }

  .footer__grid { grid-template-columns: minmax(0, 1fr); }
  .footer__bar-inner { justify-content: flex-start; gap: 6px 16px; }
  .btn { width: 100%; }
  .btn-row { gap: 10px; }
}

/* ---------- 19. 动效退让 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html { scroll-behavior: auto; }

  .site-header::after { display: none; }

  .js .reveal,
  .js .reveal.is-visible {
    opacity: 1;
    transform: none;
  }
}