/* ==========================================================================
   葡京娱乐会馆 · 共享样式表 /assets/site.css
   语言：展览画册式布局 · 会馆墨绿与古铜金 · 侧边轨道导航
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, figcaption, blockquote, dl, dd, hr { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; }
a { color: inherit; }
hr { border: 0; }
#main-content { display: block; min-height: 40vh; }

/* ---------- 2. Tokens ---------- */
:root {
  --green: #0B2B26;
  --green-deep: #061A17;
  --bronze: #B98A45;
  --bronze-soft: #D6B36A;
  --navy: #172A45;
  --amber: #E8A33D;
  --sage: #728C7A;
  --cream: #F5F0E6;
  --paper: #FBF8F1;
  --border: #CDBB9A;
  --ink: #1F2623;
  --ink-mute: #5C665F;
  --success: #4F8A6D;
  --alert: #B85C45;

  --rail-w: 272px;
  --bar-h: 66px;
  --gutter: clamp(18px, 4vw, 56px);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --shadow-card: 0 20px 40px -32px rgba(6, 26, 23, .55);

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", Georgia, "Times New Roman", serif;
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- 3. 中文排版基础 ---------- */
body {
  font-family: var(--sans);
  font-size: clamp(16px, 1.02vw, 17.5px);
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--cream);
  background-image: repeating-linear-gradient(0deg, rgba(11, 43, 38, .026) 0 1px, transparent 1px 30px);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  word-break: break-word;
}
h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 700;
  line-height: 1.25;
  color: var(--green);
  letter-spacing: .01em;
}
h1 { font-size: clamp(2.5rem, 5.6vw, 4.5rem); line-height: 1.14; letter-spacing: .02em; }
h2 { font-size: clamp(1.7rem, 3.2vw, 2.5rem); }
h3 { font-size: clamp(1.15rem, 1.6vw, 1.6rem); font-weight: 600; }
h4 { font-size: 1.05rem; font-weight: 600; }
p { text-wrap: pretty; }
.mono, .num { font-family: var(--mono); font-variant-numeric: tabular-nums; }
.note { font-size: 14px; line-height: 1.75; color: var(--ink-mute); }
.lede { font-size: clamp(1.05rem, 1.4vw, 1.25rem); line-height: 1.8; color: var(--ink-mute); }

:focus-visible { outline: 2px solid var(--amber); outline-offset: 3px; border-radius: 1px; }

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed; top: 10px; left: 10px; z-index: 200;
  transform: translateY(-180%);
  background: var(--amber); color: #22190A;
  padding: 11px 18px; border-radius: 2px;
  font: 600 14px/1 var(--sans); letter-spacing: .04em; text-decoration: none;
  box-shadow: 0 14px 30px -16px rgba(6, 26, 23, .85);
  transition: transform .22s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. Header：侧边轨道 / 移动抽屉 ---------- */
.site-header {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--rail-w);
  z-index: 80;
  display: flex; flex-direction: column; gap: 22px;
  padding: 30px 22px 24px;
  background: linear-gradient(180deg, #0B2B26 0%, #061A17 100%);
  color: #EFE7D3;
  border-right: 1px solid rgba(185, 138, 69, .38);
}
.site-header::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(115deg, rgba(214, 179, 106, .07) 0 1px, transparent 1px 14px);
}
.rail-head { position: relative; z-index: 3; display: flex; align-items: center; gap: 12px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: inherit; }
.brand__mark {
  width: 46px; height: 46px; flex: none; display: grid; place-items: center;
  border: 1px solid var(--bronze); background: rgba(185, 138, 69, .09);
  color: var(--bronze-soft); font-family: var(--serif); font-size: 22px; font-weight: 700;
  box-shadow: inset 0 0 0 3px rgba(6, 26, 23, .55);
}
.brand__name { display: block; font-family: var(--serif); font-size: 19px; font-weight: 700; letter-spacing: .06em; color: #F6EFDD; }
.brand__sub { display: block; margin-top: 3px; font-size: 11.5px; letter-spacing: .14em; color: #9FB5A6; }

.nav-toggle {
  display: none; align-items: center; gap: 9px; margin-left: auto;
  padding: 9px 13px; border: 1px solid rgba(185, 138, 69, .5); border-radius: 2px;
  color: #EFE7D3; font: 600 13px/1 var(--sans); letter-spacing: .06em; cursor: pointer;
}
.nav-toggle:hover { border-color: var(--bronze-soft); color: var(--bronze-soft); }
.nav-toggle__bars { display: flex; flex-direction: column; justify-content: center; gap: 4px; width: 16px; height: 12px; }
.nav-toggle__bars span { display: block; height: 2px; width: 100%; background: currentColor; transition: transform .24s var(--ease), opacity .24s var(--ease); }
.nav-toggle__text--close { display: none; }

.rail-panel { position: relative; z-index: 3; flex: 1; min-height: 0; display: flex; flex-direction: column; gap: 22px; overflow-y: auto; padding-right: 4px; }
.site-nav { flex: none; }
.site-nav__list { display: flex; flex-direction: column; gap: 2px; }
.site-nav__list a {
  position: relative; display: flex; align-items: center; gap: 12px;
  padding: 11px 12px 11px 15px; border-radius: 2px;
  color: #DCE6DD; font-size: 15px; letter-spacing: .02em; text-decoration: none;
  transition: background-color .22s var(--ease), color .22s var(--ease);
}
.site-nav__list a::before {
  content: ""; position: absolute; left: 0; top: 9px; bottom: 9px; width: 2px;
  background: var(--bronze); transform: scaleY(0); transform-origin: top;
  transition: transform .24s var(--ease);
}
.site-nav__list a:hover { background: rgba(214, 179, 106, .10); color: #FFFFFF; }
.site-nav__list a:hover::before { transform: scaleY(1); }
.site-nav__list a[aria-current="page"] {
  background: linear-gradient(90deg, rgba(185, 138, 69, .22), rgba(185, 138, 69, .03));
  color: #F7F0DE;
}
.site-nav__list a[aria-current="page"]::before { transform: scaleY(1); }
.site-nav__idx { font-family: var(--mono); font-size: 11px; letter-spacing: .06em; color: var(--bronze-soft); }
.site-nav__list a[aria-current="page"] .site-nav__idx { color: var(--amber); }
.site-nav__label { flex: 1; }

.rail-foot {
  margin-top: auto; display: grid; gap: 14px;
  padding-top: 18px; border-top: 1px solid rgba(185, 138, 69, .3);
}
.rail-status { display: flex; gap: 10px; align-items: flex-start; font-size: 12.5px; line-height: 1.7; color: #9FB5A6; }
.status-dot { width: 8px; height: 8px; margin-top: 7px; flex: none; border-radius: 50%; background: var(--success); box-shadow: 0 0 0 3px rgba(79, 138, 109, .22); }

.scroll-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 90;
  background: linear-gradient(90deg, var(--bronze), var(--amber));
  transform: scaleX(0); transform-origin: 0 50%; pointer-events: none;
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .6em;
  padding: .86em 1.5em; border: 1px solid transparent; border-radius: 2px;
  font: 600 15px/1.15 var(--sans); letter-spacing: .03em; text-decoration: none; cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease), background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.btn--amber { background: var(--amber); color: #22190A; border-color: rgba(232, 163, 61, .7); box-shadow: 0 12px 26px -16px rgba(232, 163, 61, .9); }
.btn--amber:hover { background: #F2B254; transform: translateY(-2px); }
.btn--bronze { background: var(--bronze); color: #170F02; border-color: rgba(214, 179, 106, .6); }
.btn--bronze:hover { background: var(--bronze-soft); transform: translateY(-2px); }
.btn--outline { background: transparent; color: var(--green); border-color: var(--green); }
.btn--outline:hover { background: var(--green); color: var(--cream); }
.btn--quiet { background: transparent; color: var(--green); border-color: var(--border); }
.btn--quiet:hover { border-color: var(--bronze); color: var(--bronze); }
.btn--onDark { background: transparent; color: #F1E7D0; border-color: rgba(214, 179, 106, .5); }
.btn--onDark:hover { background: rgba(214, 179, 106, .14); color: #FFFFFF; }
.btn--block { width: 100%; }
.btn[disabled], .btn[aria-disabled="true"] { opacity: .5; cursor: not-allowed; transform: none; }

/* ---------- 7. 容器与分区 ---------- */
.shell { width: calc(100% - var(--gutter) * 2); max-width: 1140px; margin-inline: auto; }
.shell--wide { width: calc(100% - var(--gutter) * 2); max-width: 1420px; margin-inline: auto; }
.shell--narrow { width: calc(100% - var(--gutter) * 2); max-width: 760px; margin-inline: auto; }
.section { padding-block: clamp(52px, 7.5vw, 104px); }
.section--tight { padding-block: clamp(32px, 4.5vw, 60px); }
.band { background: var(--paper); border-block: 1px solid var(--border); }
.band--dark { background: linear-gradient(180deg, var(--green), var(--green-deep)); color: #DCE6DD; border-color: rgba(185, 138, 69, .35); }
.band--dark h1, .band--dark h2, .band--dark h3, .band--dark h4 { color: #F7F0DE; }
.band--dark .lede, .band--dark .note { color: #B6C4BB; }
.band--navy { background: var(--navy); color: #D8E1EE; border-color: rgba(214, 179, 106, .28); }
.band--navy h1, .band--navy h2, .band--navy h3 { color: #F1E7D0; }
.band--navy .lede, .band--navy .note { color: #B4BECE; }
.band--sage { background: #EDF0EA; border-color: #C9D2C6; }

.hairline { height: 1px; background: linear-gradient(90deg, var(--border), rgba(205, 187, 154, 0)); }
.slant-bar { position: relative; padding-left: 16px; }
.slant-bar::before { content: ""; position: absolute; left: 0; top: 6%; bottom: 6%; width: 4px; background: linear-gradient(180deg, var(--bronze), var(--amber)); transform: skewX(-10deg); }
.terrace {
  background-image:
    repeating-linear-gradient(0deg, rgba(11, 43, 38, .05) 0 1px, transparent 1px 22px),
    repeating-linear-gradient(90deg, rgba(11, 43, 38, .04) 0 1px, transparent 1px 22px);
}

/* ---------- 8. 章节标签 / 面包屑 ---------- */
.chapter-label {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 6px 12px 6px 10px; border: 1px solid var(--border); border-radius: 2px;
  background: rgba(255, 255, 255, .6); color: var(--bronze);
  font-family: var(--mono); font-size: 12px; letter-spacing: .2em; text-transform: uppercase;
}
.chapter-label::before { content: ""; width: 7px; height: 7px; flex: none; background: var(--amber); transform: rotate(45deg); }
.chapter-label--onDark { border-color: rgba(214, 179, 106, .5); background: rgba(6, 26, 23, .38); color: var(--bronze-soft); }

.breadcrumb { margin-bottom: clamp(18px, 2.4vw, 30px); }
.breadcrumb ol { display: flex; flex-wrap: wrap; gap: 8px; font-family: var(--mono); font-size: 13px; color: var(--ink-mute); }
.breadcrumb li + li::before { content: "/"; margin-right: 8px; color: var(--border); }
.breadcrumb a { text-decoration: none; color: var(--ink-mute); }
.breadcrumb a:hover { color: var(--bronze); }
.breadcrumb [aria-current="page"] { color: var(--green); }

/* ---------- 9. 卡片与网格 ---------- */
.card {
  position: relative; background: var(--paper); border: 1px solid var(--border); border-radius: 2px;
  padding: clamp(20px, 2.6vw, 32px); box-shadow: var(--shadow-card);
}
.card--layer { box-shadow: var(--shadow-card), 10px 10px 0 -1px rgba(205, 187, 154, .45), 10px 10px 0 0 var(--border); }
.card--lift { transition: transform .24s var(--ease), box-shadow .24s var(--ease); }
.card--lift:hover { transform: translateY(-3px); box-shadow: 0 28px 46px -30px rgba(6, 26, 23, .6); }

.grid { display: grid; gap: clamp(18px, 2.4vw, 32px); }
.grid--2, .grid--3, .grid--aside { grid-template-columns: 1fr; }
@media (min-width: 640px) { .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--stagger > *:nth-child(even) { margin-top: clamp(20px, 4vw, 54px); }
}
@media (min-width: 1024px) {
  .grid--aside { grid-template-columns: minmax(220px, .7fr) minmax(0, 1.6fr); gap: clamp(28px, 4vw, 72px); }
}

/* ---------- 10. 长文 / 正文 ---------- */
.prose { max-width: 72ch; }
.prose > * + * { margin-top: 1.05em; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.8em; }
.prose ul { list-style: none; }
.prose ul li { position: relative; padding-left: 1.4em; }
.prose ul li::before { content: ""; position: absolute; left: 0; top: .78em; width: 8px; height: 1px; background: var(--bronze); }
.prose ol { list-style: decimal; padding-left: 1.5em; }
.prose ol li::marker { font-family: var(--mono); color: var(--bronze); }
.prose blockquote { margin: 1.7em 0; padding: 2px 0 2px 20px; border-left: 3px solid var(--bronze); font-family: var(--serif); font-size: 1.12em; color: var(--green); }
.prose a { color: var(--green); text-decoration: underline; text-decoration-color: var(--bronze); text-underline-offset: 4px; }
.prose code { font-family: var(--mono); font-size: .92em; background: rgba(114, 140, 122, .14); padding: .15em .4em; border-radius: 2px; }

/* ---------- 11. 表格与分页 ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); background: var(--paper); border-radius: 2px; }
.table { width: 100%; min-width: 600px; border-collapse: collapse; font-size: 15px; }
.table caption { text-align: left; padding: 14px 16px; font-size: 13px; color: var(--ink-mute); border-bottom: 1px solid var(--border); }
.table th, .table td { padding: 12px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid rgba(205, 187, 154, .6); }
.table thead th { background: var(--green); color: #EFE7D3; font-weight: 600; font-size: 13px; letter-spacing: .08em; border-bottom-color: rgba(185, 138, 69, .5); }
.table tbody tr:nth-child(even) { background: rgba(114, 140, 122, .09); }
.table tbody tr:hover { background: rgba(232, 163, 61, .12); }
.table .num { font-family: var(--mono); font-size: 13.5px; color: var(--ink-mute); white-space: nowrap; }
.table--sage thead th { background: var(--sage); color: #F2F5EF; }
.pager { display: flex; flex-wrap: wrap; gap: 8px; justify-content: center; margin-top: 20px; }
.pager button, .pager a {
  min-width: 40px; padding: 9px 12px; border: 1px solid var(--border); border-radius: 2px;
  background: var(--paper); color: var(--green); font-family: var(--mono); font-size: 13px; text-decoration: none; cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.pager button:hover, .pager a:hover { border-color: var(--bronze); color: var(--bronze); }
.pager [aria-current="page"] { background: var(--green); color: var(--cream); border-color: var(--green); }

/* ---------- 12. 筛选标签 / 折叠问答 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.chip {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px; border: 1px solid var(--border); border-radius: 2px;
  background: var(--paper); color: var(--ink-mute); font-size: 13.5px; cursor: pointer;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.chip:hover { border-color: var(--bronze); color: var(--green); }
.chip[aria-pressed="true"] { background: var(--green); color: var(--cream); border-color: var(--green); }

.disclosure { background: var(--paper); border: 1px solid var(--border); border-radius: 2px; }
.disclosure + .disclosure { margin-top: 10px; }
.disclosure summary {
  display: flex; align-items: flex-start; gap: 14px; padding: 16px 20px; cursor: pointer;
  font-family: var(--serif); font-weight: 600; font-size: 1.05rem; color: var(--green);
  list-style: none;
}
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure summary::after { content: "+"; margin-left: auto; font-family: var(--mono); font-size: 1.1rem; line-height: 1; color: var(--bronze); }
.disclosure[open] summary::after { content: "–"; }
.disclosure[open] summary { border-bottom: 1px solid rgba(205, 187, 154, .6); }
.disclosure__body { padding: 16px 20px 20px; color: var(--ink-mute); }

/* ---------- 13. 章节目录 ---------- */
.chapter-nav { font-size: 14px; }
.chapter-nav ol { display: grid; gap: 2px; }
.chapter-nav a {
  display: flex; gap: 10px; align-items: baseline; padding: 9px 10px;
  border-left: 2px solid transparent; color: var(--ink-mute); text-decoration: none;
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}
.chapter-nav a:hover { color: var(--green); background: rgba(114, 140, 122, .09); }
.chapter-nav a[aria-current] { color: var(--green); font-weight: 600; border-left-color: var(--amber); background: rgba(232, 163, 61, .12); }
.chapter-nav__idx { font-family: var(--mono); font-size: 11.5px; color: var(--bronze); }

/* ---------- 14. 图片容器（页面阶段放图） ---------- */
.media-frame {
  position: relative; display: block; width: 100%; overflow: hidden;
  background: var(--green-deep); border: 1px solid var(--border); border-radius: 2px;
}
.media-frame::after { content: ""; position: absolute; inset: 0; border: 1px solid rgba(245, 240, 230, .14); pointer-events: none; }
.media-frame img { display: block; width: 100%; height: 100%; object-fit: cover; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--plain { background: var(--cream); }
.media-frame--pattern {
  background-color: var(--green);
  background-image:
    repeating-linear-gradient(115deg, rgba(214, 179, 106, .16) 0 1px, transparent 1px 16px),
    repeating-linear-gradient(0deg, rgba(114, 140, 122, .22) 0 2px, transparent 2px 26px);
}
.media-figure { margin: 0; }
.media-figure figcaption, .media-frame__caption { margin-top: 10px; font-size: 13px; color: var(--ink-mute); }
.media-row { display: grid; gap: clamp(14px, 2vw, 24px); grid-template-columns: 1fr; }
@media (min-width: 700px) { .media-row { grid-template-columns: repeat(3, minmax(0, 1fr)); } }

/* ---------- 15. 显现动效 ---------- */
[data-reveal] { opacity: 0; transform: translateY(18px); transition: opacity .5s var(--ease), transform .5s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 16. Footer ---------- */
.site-footer {
  position: relative; overflow: hidden;
  padding: clamp(44px, 6vw, 78px) 0 26px;
  background: linear-gradient(180deg, #0B2B26 0%, #061A17 100%);
  color: #D8E0D8; border-top: 1px solid rgba(185, 138, 69, .4);
}
.site-footer::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: repeating-linear-gradient(160deg, rgba(214, 179, 106, .06) 0 1px, transparent 1px 16px);
}
.site-footer__inner { position: relative; z-index: 1; width: calc(100% - var(--gutter) * 2); max-width: 1140px; margin-inline: auto; }
.footer-grid { display: grid; gap: clamp(26px, 4vw, 48px); grid-template-columns: 1fr; }
@media (min-width: 700px) { .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: 1.4fr 1fr 1fr 1.25fr; } }

.footer-col { min-width: 0; }
.footer-col__title {
  margin-bottom: 14px; font-family: var(--serif); font-size: 15px; font-weight: 600;
  letter-spacing: .12em; color: var(--bronze-soft);
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-brand__mark {
  width: 42px; height: 42px; flex: none; display: grid; place-items: center;
  border: 1px solid var(--bronze); color: var(--bronze-soft);
  font-family: var(--serif); font-size: 20px; font-weight: 700; background: rgba(185, 138, 69, .1);
}
.footer-brand__name { font-family: var(--serif); font-size: 19px; font-weight: 700; letter-spacing: .06em; color: #F6EFDD; }
.footer-brand__sub { margin-top: 10px; font-size: 12.5px; letter-spacing: .12em; color: #9FB5A6; }
.footer-note { margin-top: 12px; max-width: 42ch; font-size: 13px; line-height: 1.8; color: #9FB5A6; }

.footer-list { display: grid; gap: 10px; }
.footer-list a { font-size: 14.5px; color: #D8E0D8; text-decoration: none; transition: color .2s var(--ease); }
.footer-list a:hover { color: var(--bronze-soft); }

.footer-contact { display: grid; gap: 12px; }
.footer-contact__row { display: grid; gap: 4px; }
.footer-contact__label { font-size: 12px; letter-spacing: .14em; color: #8FA697; }
.footer-contact__value { font-size: 13.5px; color: #E7EDE6; word-break: break-all; }
.footer-contact__value--text { font-family: var(--sans); font-size: 13.5px; word-break: normal; }

.footer-bottom {
  display: flex; flex-wrap: wrap; gap: 10px 22px; align-items: center; justify-content: space-between;
  margin-top: clamp(30px, 4vw, 48px); padding-top: 20px;
  border-top: 1px solid rgba(185, 138, 69, .3);
}
.footer-legal { font-size: 13px; color: #9FB5A6; }
.footer-icp { font-family: var(--mono); font-size: 12.5px; letter-spacing: .06em; color: #8FA697; }

/* ---------- 17. 返回顶部 ---------- */
.to-top {
  position: fixed; right: clamp(14px, 3vw, 30px); bottom: clamp(14px, 3vw, 30px); z-index: 70;
  width: 46px; height: 46px; display: grid; place-items: center; border-radius: 2px;
  background: var(--green); color: var(--bronze-soft); border: 1px solid rgba(214, 179, 106, .55);
  font-size: 17px; cursor: pointer; opacity: 0; visibility: hidden; transform: translateY(10px);
  box-shadow: 0 16px 32px -18px rgba(6, 26, 23, .9);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s, background-color .2s var(--ease), color .2s var(--ease);
}
.to-top.is-visible { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { background: var(--green-deep); color: var(--amber); }

/* ---------- 18. 桌面端：轨道让位 ---------- */
@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
  html { scroll-padding-top: 32px; }
  .scroll-progress { left: var(--rail-w); }
}

/* ---------- 19. 移动端与平板：顶栏 + 抽屉 ---------- */
@media (max-width: 1023px) {
  body { padding-top: var(--bar-h); }
  .site-header {
    top: 0; left: 0; right: 0; bottom: auto; width: auto; height: var(--bar-h);
    flex-direction: row; align-items: center; gap: 12px; padding: 0 16px;
    border-right: 0; border-bottom: 1px solid rgba(185, 138, 69, .4);
  }
  .site-header::after { background: repeating-linear-gradient(115deg, rgba(214, 179, 106, .08) 0 1px, transparent 1px 12px); }
  .rail-head { flex: 1; }
  .brand__mark { width: 38px; height: 38px; font-size: 18px; }
  .brand__name { font-size: 16.5px; }
  .brand__sub { font-size: 10.5px; letter-spacing: .1em; }
  .nav-toggle { display: inline-flex; flex: none; }

  .site-header::before {
    content: ""; position: fixed; inset: 0; z-index: 1;
    background: rgba(6, 26, 23, .58); opacity: 0; pointer-events: none;
    transition: opacity .26s var(--ease);
  }
  .site-header[data-open]::before { opacity: 1; pointer-events: auto; }

  .rail-panel {
    position: fixed; top: var(--bar-h); bottom: 0; left: 0; z-index: 2;
    width: min(84vw, 332px); padding: 22px 18px 30px;
    background: linear-gradient(180deg, #0B2B26 0%, #061A17 100%);
    border-right: 1px solid rgba(185, 138, 69, .4);
    box-shadow: 26px 0 60px -34px rgba(0, 0, 0, .75);
    transform: translateX(-104%); visibility: hidden;
    transition: transform .28s var(--ease), visibility .28s;
    overflow-y: auto;
  }
  .site-header[data-open] .rail-panel { transform: translateX(0); visibility: visible; }
  .site-nav__list a { padding: 13px 12px 13px 15px; font-size: 15.5px; }
  body.is-nav-open { overflow: hidden; }

  .site-header[data-open] .nav-toggle__text--menu { display: none; }
  .site-header[data-open] .nav-toggle__text--close { display: inline; }
  .site-header[data-open] .nav-toggle__bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .site-header[data-open] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
  .site-header[data-open] .nav-toggle__bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
}

/* ---------- 20. 减少动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}