/* ============================================================
   金沙主页 — 共享外壳样式表 /assets/site.css
   年鉴馆式视觉：雾白纸底 + 深黛蓝轨道 + 赭石金锚点
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
  --paper: #F5F1E8;
  --ink: #171714;
  --blue: #1D3448;
  --gold: #B8752B;
  --shale: #6C6A61;
  --sand: #D9C9AE;
  --verdigris: #3F7E72;
  --cinnabar: #B33B2E;
  --deep: #0E1820;

  --rail-w: 272px;
  --bar-h: 62px;
  --maxw: 1120px;

  --edge: 2px solid var(--ink);
  --push: 6px 6px 0 var(--ink);

  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", serif;
  --mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;

  --ease: cubic-bezier(.4, 0, .2, 1);
}

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

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

body {
  margin: 0;
  padding: 0;
  background-color: var(--paper);
  background-image: repeating-linear-gradient(
    180deg,
    rgba(23, 23, 20, .022) 0 1px,
    transparent 1px 9px
  );
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }

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

::selection {
  background: var(--gold);
  color: #FFF8EC;
}

/* 中文排版基线 */
p { text-wrap: pretty; }
h1, h2, h3 { text-wrap: balance; }

/* ---------- 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 400;
  padding: 12px 20px;
  background: var(--ink);
  color: var(--paper);
  font-size: 14px;
  font-weight: 700;
  border: 2px solid var(--gold);
  transform: translateY(-200%);
  transition: transform .16s var(--ease);
}
.skip-link:focus {
  transform: none;
  outline-color: var(--gold);
}
@media (min-width: 1024px) {
  .skip-link { left: calc(var(--rail-w) + 12px); }
}

/* ---------- 屏幕阅读器专用 ---------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   头部外壳
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  height: var(--bar-h);
  background: var(--deep);
  color: var(--paper);
}

/* --- 阅读进度 --- */
.read-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: rgba(245, 241, 232, .14);
  z-index: 240;
  pointer-events: none;
}
.read-progress__bar {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--gold) 0%, var(--cinnabar) 100%);
  transition: width .1s linear;
}

/* --- 移动顶栏 --- */
.topbar {
  position: relative;
  z-index: 85;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  height: 100%;
  padding: 0 16px;
  background: var(--deep);
  border-bottom: 3px solid var(--ink);
}
.topbar__brand {
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: .14em;
  line-height: 1;
  color: var(--paper);
}
.topbar__brand-sub {
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 400;
  letter-spacing: .16em;
  color: var(--sand);
}

/* --- 抽屉开关 --- */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 2px solid var(--sand);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
  line-height: 1;
  transition: color .15s var(--ease), border-color .15s var(--ease);
}
.nav-toggle:hover,
.nav-toggle[aria-expanded="true"] {
  color: var(--gold);
  border-color: var(--gold);
}
.nav-toggle__bars {
  display: block;
  width: 18px;
}
.nav-toggle__bars i {
  display: block;
  height: 2px;
  margin: 4px 0;
  background: currentColor;
  transition: transform .2s var(--ease), opacity .2s var(--ease);
}
.site-header[data-open] .nav-toggle__bars i:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars i:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle__label {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .14em;
}

/* --- 遮罩 --- */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 78;
  background: rgba(14, 24, 32, .58);
}
.nav-scrim[hidden] { display: none; }

/* --- 轨道 / 抽屉 --- */
.rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 80;
  display: flex;
  flex-direction: column;
  width: min(86vw, 340px);
  padding: calc(var(--bar-h) + 22px) 20px 26px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  background: var(--blue);
  color: var(--paper);
  border-right: 3px solid var(--ink);
  transform: translateX(-102%);
  transition: transform .24s var(--ease);
}
.site-header[data-open] .rail { transform: translateX(0); }

body.is-nav-open { overflow: hidden; }

/* --- 品牌块 --- */
.rail__brand {
  padding-bottom: 18px;
  margin-bottom: 22px;
  border-bottom: 2px solid rgba(245, 241, 232, .16);
}
.brand { display: block; }
.brand__mark {
  display: block;
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 900;
  letter-spacing: .18em;
  line-height: 1.08;
  color: var(--paper);
}
.brand__line {
  display: block;
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  line-height: 1.6;
  color: var(--sand);
}

/* --- 栏目导航 --- */
.rail__nav { flex: 0 0 auto; }
.rail__eyebrow {
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .26em;
  color: var(--gold);
}
.nav-list {
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.nav-list__item { position: relative; }
.nav-link {
  display: grid;
  grid-template-columns: 2.4em 1fr;
  align-items: baseline;
  gap: 8px;
  padding: 11px 10px;
  border-left: 3px solid transparent;
  color: var(--sand);
  font-size: 15px;
  line-height: 1.45;
  transition: color .15s var(--ease),
              background-color .15s var(--ease),
              border-color .15s var(--ease);
}
.nav-link__idx {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: rgba(217, 201, 174, .52);
  transition: color .15s var(--ease);
}
.nav-link:hover {
  color: var(--paper);
  background: rgba(245, 241, 232, .07);
  border-left-color: var(--sand);
}
.nav-link:hover .nav-link__idx { color: var(--gold); }
.nav-link[aria-current="page"] {
  color: var(--gold);
  font-weight: 700;
  background: rgba(184, 117, 43, .15);
  border-left-color: var(--gold);
}
.nav-link[aria-current="page"] .nav-link__idx { color: var(--gold); }

/* --- 章节追踪 --- */
.rail__chapter {
  margin-top: 22px;
  padding-top: 12px;
  border-top: 2px solid rgba(245, 241, 232, .16);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  line-height: 1.6;
  color: rgba(217, 201, 174, .78);
}
.rail__chapter:empty { display: none; }

/* --- 轨道底部 --- */
.rail__foot {
  margin-top: auto;
  padding-top: 22px;
  border-top: 2px solid rgba(245, 241, 232, .16);
}
.rail__note {
  margin-bottom: 14px;
  font-size: 12px;
  line-height: 1.65;
  color: rgba(217, 201, 174, .82);
}

/* ============================================================
   按钮系统
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.4;
  text-align: center;
  box-shadow: var(--push);
  transition: transform .14s var(--ease),
              box-shadow .14s var(--ease),
              background-color .14s var(--ease),
              color .14s var(--ease);
}
.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink);
}
.btn:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}
.btn--gold {
  background: var(--gold);
  color: #FFF8EC;
  border-color: var(--deep);
  box-shadow: 5px 5px 0 var(--deep);
}
.btn--gold:hover { box-shadow: 7px 7px 0 var(--deep); }
.btn--gold:active { box-shadow: 1px 1px 0 var(--deep); }
.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--sand);
  box-shadow: none;
}
.btn--ghost:hover {
  background: rgba(245, 241, 232, .1);
  transform: none;
  box-shadow: none;
}
.btn--sm {
  padding: 9px 14px;
  font-size: 13px;
  box-shadow: 3px 3px 0 var(--ink);
}
.btn--sm:hover { box-shadow: 5px 5px 0 var(--ink); }
.btn--block {
  display: flex;
  width: 100%;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  position: relative;
  background: var(--deep);
  color: var(--sand);
  border-top: 3px solid var(--ink);
}
.footer__ticks {
  height: 12px;
  background: repeating-linear-gradient(
    90deg,
    rgba(217, 201, 174, .55) 0 2px,
    transparent 2px 24px
  );
  border-bottom: 1px solid rgba(217, 201, 174, .18);
}
.footer__inner {
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 44px 20px 28px;
}
.footer__mast {
  padding-bottom: 26px;
}
.footer__mark {
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 900;
  letter-spacing: .2em;
  line-height: 1;
  color: var(--paper);
}
.footer__line {
  margin-top: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: rgba(217, 201, 174, .75);
}
.footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px 24px;
  padding-top: 30px;
  border-top: 2px solid rgba(217, 201, 174, .22);
}
.footer__col { min-width: 0; }
.footer__title {
  margin-bottom: 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .24em;
  color: var(--gold);
}
.footer__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer__link {
  display: inline-block;
  padding-bottom: 1px;
  border-bottom: 1px solid transparent;
  font-size: 15px;
  line-height: 1.6;
  color: var(--sand);
  transition: color .14s var(--ease), border-color .14s var(--ease);
}
.footer__link:hover {
  color: var(--paper);
  border-bottom-color: var(--gold);
}
.footer__list--plain li {
  font-size: 15px;
  line-height: 1.65;
  color: rgba(217, 201, 174, .9);
  overflow-wrap: anywhere;
}
.footer__note {
  margin-top: 30px;
  padding: 16px 18px;
  background: rgba(217, 201, 174, .08);
  border-left: 3px solid var(--gold);
  font-size: 13px;
  line-height: 1.7;
  color: rgba(217, 201, 174, .88);
}
.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  margin-top: 28px;
  padding-top: 20px;
  border-top: 2px solid rgba(217, 201, 174, .22);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(217, 201, 174, .75);
}
.footer__copy { margin: 0; }
.footer__legal {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
}
.footer__legal a {
  border-bottom: 1px solid rgba(217, 201, 174, .35);
  transition: color .14s var(--ease), border-color .14s var(--ease);
}
.footer__legal a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.footer__icp { margin: 0; }

/* ============================================================
   通用版面与组件（供页面阶段使用）
   ============================================================ */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: 20px;
}

#main-content { display: block; }
#main-content:focus { outline: none; }
#main-content,
:target {
  scroll-margin-top: calc(var(--bar-h) + 16px);
}

.prose {
  max-width: 38em;
  font-size: 17px;
  line-height: 1.78;
}
.prose p + p { margin-top: 1.05em; }
.prose h2,
.prose h3 {
  font-family: var(--serif);
  font-weight: 900;
  line-height: 1.36;
  margin-top: 1.7em;
  margin-bottom: .55em;
}
.prose h2 { font-size: 26px; }
.prose h3 { font-size: 20px; }
.prose ul,
.prose ol {
  display: flex;
  flex-direction: column;
  gap: .5em;
  margin-top: 1em;
}
.prose ul li {
  position: relative;
  padding-left: 1.45em;
}
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .76em;
  width: 9px;
  height: 2px;
  background: var(--gold);
}
.prose ol { counter-reset: step; }
.prose ol li {
  position: relative;
  padding-left: 2.2em;
  counter-increment: step;
}
.prose ol li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: .2em;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--gold);
}
.prose a {
  border-bottom: 2px solid var(--gold);
  transition: background-color .14s var(--ease);
}
.prose a:hover { background: rgba(184, 117, 43, .14); }
.prose blockquote {
  margin: 1.4em 0;
  padding: 16px 20px;
  border-left: 4px solid var(--gold);
  background: rgba(217, 201, 174, .32);
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.7;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  line-height: 1.6;
  color: var(--shale);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--gold);
  flex: 0 0 auto;
}

.section { padding-block: 36px; }
.section__head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 24px;
}
.section__title {
  font-family: var(--serif);
  font-weight: 900;
  font-size: clamp(24px, 3.6vw, 34px);
  line-height: 1.3;
  letter-spacing: -.01em;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: 18px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--shale);
}
.breadcrumb a {
  border-bottom: 1px solid var(--sand);
  transition: color .14s var(--ease), border-color .14s var(--ease);
}
.breadcrumb a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold);
}
.breadcrumb__sep { color: var(--sand); }
.breadcrumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  border: 1.5px solid currentColor;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .08em;
  line-height: 1.7;
  white-space: nowrap;
}
.tag--gold { color: #8F5716; background: rgba(184, 117, 43, .13); }
.tag--verdigris { color: #2C5C53; background: rgba(63, 126, 114, .14); }
.tag--cinnabar { color: var(--cinnabar); background: rgba(179, 59, 46, .1); }
.tag--shale { color: var(--shale); background: rgba(108, 106, 97, .1); }

.year-chip {
  display: inline-block;
  padding: 2px 12px;
  font-family: var(--mono);
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 600;
  letter-spacing: .02em;
  line-height: 1.4;
  color: var(--gold);
  background: rgba(217, 201, 174, .42);
  border-bottom: 2px solid var(--gold);
}

.card {
  padding: 22px;
  background: #FBF8F1;
  border: var(--edge);
  box-shadow: var(--push);
}
.card__title {
  margin-bottom: 10px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 900;
  line-height: 1.36;
}
.card__meta {
  margin-bottom: 12px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--shale);
}

/* 图片容器基础规则 —— 页面阶段直接放入 <img> */
.figure { margin: 0; }
.figure__frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--sand);
  border: var(--edge);
  box-shadow: var(--push);
}
.figure__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.72) contrast(1.04);
}
.figure__cap {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--shale);
}
.figure--wide .figure__frame { aspect-ratio: 16 / 9; }
.figure--tall .figure__frame { aspect-ratio: 3 / 4; }
.figure--square .figure__frame { aspect-ratio: 1 / 1; }

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

/* 显现动画 */
[data-reveal] {
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
[data-reveal].is-pre {
  opacity: 0;
  transform: translateY(16px);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ============================================================
   响应式
   ============================================================ */
@media (min-width: 640px) {
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__col--wide { grid-column: 1 / -1; }
  .grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__base { font-size: 12px; }
}

@media (min-width: 768px) {
  .wrap { padding-inline: 32px; }
  .footer__inner { padding: 56px 32px 32px; }
  .section { padding-block: 56px; }
  .footer__icp { margin-left: auto; }
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }

  .site-header {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: auto;
    width: var(--rail-w);
    height: auto;
    display: flex;
    flex-direction: column;
    background: var(--blue);
    border-right: 3px solid var(--ink);
    z-index: 100;
  }

  .topbar,
  .nav-scrim { display: none !important; }

  .read-progress {
    left: var(--rail-w);
    right: 0;
  }

  .rail {
    position: static;
    width: auto;
    flex: 1 1 auto;
    min-height: 0;
    padding: 30px 22px 24px;
    border-right: 0;
    transform: none;
    transition: none;
  }

  body.is-nav-open { overflow: visible; }

  #main-content,
  :target { scroll-margin-top: 24px; }

  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer__col--wide { grid-column: auto; }
  .footer__base { gap: 12px 26px; }
}

@media (min-width: 1280px) {
  :root { --rail-w: 300px; }
  .brand__mark { font-size: 38px; }
  .nav-link { font-size: 16px; padding: 12px 10px; }
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

  .rail { transition: none; }
  [data-reveal],
  [data-reveal].is-pre {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .btn:hover,
  .btn:active {
    transform: none;
    box-shadow: var(--push);
  }
  .btn--gold:hover,
  .btn--gold:active { box-shadow: 5px 5px 0 var(--deep); }
  .skip-link:focus { transform: none; }
}