/* ============================================================
   /assets/site.css — 大赢家游戏 全站共享样式
   墨蓝档案底色 / 琥珀金强调 / 青瓷绿状态 / 余烬橙变更
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  background: #0B1626;
}

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  margin: 0;
  background: #0B1626;
  color: #EEF3F9;
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 16.5px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

/* ---------- 变量 ---------- */
:root {
  --ink-900: #0B1626;
  --ink-800: #122236;
  --ink-700: #1B3149;

  --amber-500: #F0B03C;
  --amber-700: #B87A16;

  --celadon-400: #63C6AB;
  --celadon-700: #2C7C68;

  --ember-500: #E06A3C;

  --cream-100: #F3ECDC;
  --mist-200: #C7D4E2;
  --paper-50: #EEF3F9;

  --line: rgba(199, 212, 226, 0.14);
  --line-strong: rgba(199, 212, 226, 0.32);

  --font-display: "Noto Sans SC", "Source Han Sans SC", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", Georgia, "Songti SC", serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --radius-lg: 26px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --radius-pill: 999px;

  --wrap: 1280px;
  --gutter: clamp(16px, 4vw, 44px);
  --rail-w: 240px;
  --gap: 22px;
  --nav-h: 74px;
}

/* ---------- 基础排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.16;
  text-wrap: balance;
}

h1 { font-size: clamp(34px, 5.6vw, 64px); }
h2 { font-size: clamp(24px, 3.4vw, 34px); }
h3 { font-size: clamp(19px, 2.2vw, 20px); letter-spacing: -0.01em; }
h4 { font-size: 17px; letter-spacing: 0; }

p { text-wrap: pretty; }

a:focus-visible,
button:focus-visible,
summary:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 3px;
  border-radius: 6px;
}

::selection {
  background: var(--amber-500);
  color: var(--ink-900);
}

/* ---------- 通用工具 ---------- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--amber-500);
  color: var(--ink-900);
  font-weight: 800;
  font-size: 14px;
  transform: translateY(-160%);
  transition: transform 160ms ease-out;
}
.skip-link:focus-visible,
.skip-link:focus {
  transform: translateY(0);
}

.mono {
  font-family: var(--font-mono);
  font-size: 0.9em;
  letter-spacing: 0.01em;
  color: var(--amber-500);
  font-variant-numeric: tabular-nums;
}

.copyable {
  cursor: pointer;
  border-radius: 6px;
  padding: 1px 5px;
  margin-inline: -5px;
  transition: background 160ms ease-out, color 160ms ease-out;
}
.copyable:hover { background: rgba(240, 176, 60, 0.14); }
.copyable.is-copied {
  background: var(--celadon-700);
  color: var(--paper-50);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.01em;
  line-height: 1.4;
  text-align: center;
  cursor: pointer;
  transition: background 160ms ease-out, color 160ms ease-out,
              border-color 160ms ease-out, box-shadow 200ms ease-out,
              transform 160ms ease-out;
}
.btn--primary {
  background: var(--amber-500);
  color: var(--ink-900);
  box-shadow: 0 6px 18px rgba(240, 176, 60, 0.16);
}
.btn--primary:hover { background: #FFC44F; }
.btn--ghost {
  border-color: var(--line-strong);
  color: var(--paper-50);
}
.btn--ghost:hover {
  border-color: var(--amber-500);
  color: var(--amber-500);
}
.btn:active {
  box-shadow: 0 0 0 7px rgba(240, 176, 60, 0.2);
  transform: translateY(1px);
}

/* ============================================================
   头部
   ============================================================ */
.site-header { display: contents; }

.masthead {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  grid-template-areas: "util brand cta";
  align-items: center;
  gap: 18px clamp(16px, 3vw, 40px);
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(20px, 3.4vw, 34px) var(--gutter) clamp(16px, 2.4vw, 24px);
  overflow: hidden;
}
.masthead::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, rgba(240, 176, 60, 0.20) 1px, transparent 0);
  background-size: 11px 11px;
  -webkit-mask-image: radial-gradient(120% 110% at 50% 0%, #000 0%, transparent 72%);
  mask-image: radial-gradient(120% 110% at 50% 0%, #000 0%, transparent 72%);
  opacity: 0.65;
}
.masthead > * { position: relative; }

.site-header::after {
  content: "";
  display: block;
  height: 1px;
  background: var(--line);
}

.masthead__utility {
  grid-area: util;
  justify-self: start;
  max-width: 250px;
  font-family: var(--font-serif);
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--mist-200);
}

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

.masthead__name {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(38px, 6.4vw, 64px);
  letter-spacing: -0.02em;
  line-height: 1.02;
  color: var(--paper-50);
  padding: 0 4px;
  background-image: linear-gradient(transparent 66%, rgba(240, 176, 60, 0.55) 66%, rgba(240, 176, 60, 0.55) 92%, transparent 92%);
}

.masthead__sub {
  font-family: var(--font-serif);
  font-size: clamp(12px, 1.4vw, 14px);
  letter-spacing: 0.34em;
  text-indent: 0.34em;
  color: var(--amber-500);
}

.masthead__cta { grid-area: cta; justify-self: end; }

/* --- 胶囊索引条（吸顶） --- */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 10px var(--gutter) 14px;
  background: rgba(11, 22, 38, 0.92);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: var(--ink-700);
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--paper-50);
  cursor: pointer;
}
.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 2px;
  background: var(--amber-500);
  border-radius: 2px;
  transition: background 160ms ease-out;
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--amber-500);
  border-radius: 2px;
  transition: transform 180ms ease-out, opacity 180ms ease-out;
}
.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.site-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px;
  border-radius: var(--radius-pill);
  background: var(--ink-800);
  border: 1px solid var(--line);
}

.site-nav__item { display: block; }

.site-nav__link {
  display: block;
  padding: 8px 18px;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 14.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--paper-50);
  white-space: nowrap;
  transition: background 160ms ease-out, color 160ms ease-out;
}
.site-nav__link:hover {
  background: rgba(240, 176, 60, 0.16);
  color: var(--amber-500);
}
.site-nav__link[aria-current="page"] {
  background: var(--amber-500);
  color: var(--ink-900);
  box-shadow: inset 0 0 0 1px rgba(11, 22, 38, 0.14);
}

.site-nav__note {
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--mist-200);
  white-space: nowrap;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: clamp(48px, 7vw, 88px);
  background: var(--ink-800);
  border-top: 1px solid var(--line);
}

.site-footer__inner {
  display: grid;
  grid-template-columns: minmax(200px, 1.1fr) 2.4fr;
  gap: clamp(26px, 4vw, 56px);
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(34px, 5vw, 58px) var(--gutter) clamp(26px, 3vw, 38px);
}

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

.footer-brand__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 30px;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--paper-50);
}

.footer-brand__sub {
  font-family: var(--font-serif);
  font-size: 12.5px;
  letter-spacing: 0.28em;
  text-indent: 0.28em;
  color: var(--amber-500);
}

.footer-brand__note {
  margin-top: 6px;
  max-width: 30ch;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist-200);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 36px);
}

.footer-col { min-width: 0; }

.footer-col__title {
  font-family: var(--font-serif);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--celadon-400);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.footer-list { display: flex; flex-direction: column; gap: 9px; }

.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--mist-200);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease-out, border-color 160ms ease-out;
}
.footer-link:hover {
  color: var(--amber-500);
  border-bottom-color: var(--amber-700);
}

.footer-lines { gap: 7px; }

.footer-line {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--mist-200);
  overflow-wrap: anywhere;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 16px var(--gutter) 26px;
  border-top: 1px solid var(--line);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--mist-200);
}
.footer-legal__icp { font-family: var(--font-mono); }
.footer-legal__copy { color: rgba(199, 212, 226, 0.72); }

/* ============================================================
   页面通用布局组件
   ============================================================ */
.page-section {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-block: clamp(38px, 5.4vw, 68px);
  padding-inline: var(--gutter);
}
.page-section--narrow { max-width: 880px; }
.page-section--wide { max-width: 1440px; }

.kicker {
  display: block;
  font-family: var(--font-serif);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--celadon-400);
  margin-bottom: 12px;
}

.section-title { color: var(--paper-50); }

.section-lede {
  margin-top: 12px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--mist-200);
}

/* --- 非对称双栏：左索引抽屉 + 右主区 --- */
.layout-rail {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: 32px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.rail {
  position: sticky;
  top: calc(var(--nav-h) + 16px);
  align-self: start;
  padding: 18px 16px;
  background: var(--ink-800);
  border-left: 3px solid var(--amber-500);
  border-radius: 0;
  box-shadow: inset 0 0 0 1px rgba(199, 212, 226, 0.08);
}

.rail__title {
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--mist-200);
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.rail__list { display: flex; flex-direction: column; gap: 2px; }

.rail__item { display: block; }

.rail__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 6px 8px 0;
  font-size: 14.5px;
  font-weight: 500;
  color: var(--mist-200);
  transition: color 160ms ease-out, background 160ms ease-out;
}
.rail__link::before {
  content: "";
  flex: none;
  width: 3px;
  height: 14px;
  background: transparent;
  transition: background 160ms ease-out, height 160ms ease-out;
}
.rail__link:hover { color: var(--paper-50); }
.rail__link:hover::before { background: var(--amber-700); }
.rail__link[aria-current="true"] {
  color: var(--amber-500);
  font-weight: 800;
}
.rail__link[aria-current="true"]::before {
  background: var(--amber-500);
  height: 22px;
}

.rail__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: rgba(199, 212, 226, 0.6);
  letter-spacing: 0.04em;
}
.rail__link[aria-current="true"] .rail__num { color: var(--celadon-400); }

/* --- 卡片瀑布流 --- */
.grid {
  display: grid;
  gap: var(--gap);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  align-items: start;
}
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: var(--ink-700);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  transition: transform 160ms ease-out, border-color 160ms ease-out, box-shadow 160ms ease-out;
}
.card:hover,
.card:focus-within {
  transform: translateY(-2px);
  border-color: var(--amber-500);
  box-shadow: 0 14px 32px rgba(4, 10, 18, 0.45);
}

.card--wide { grid-column: span 2; }

.card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.card__title {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--paper-50);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--mist-200);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
}

.card__body {
  font-size: 15px;
  line-height: 1.75;
  color: var(--mist-200);
}

.card__foot {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--mist-200);
}

/* --- 状态标签 --- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border-radius: var(--radius-pill);
  border: 1px solid currentColor;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  line-height: 1.6;
  white-space: nowrap;
  color: var(--mist-200);
}
.chip--download {
  color: var(--celadon-400);
  border-color: rgba(99, 198, 171, 0.55);
  background: rgba(44, 124, 104, 0.22);
}
.chip--issue {
  color: var(--ember-500);
  border-color: rgba(224, 106, 60, 0.55);
  background: rgba(224, 106, 60, 0.14);
}
.chip--route {
  color: var(--amber-500);
  border-color: rgba(240, 176, 60, 0.55);
  background: rgba(240, 176, 60, 0.13);
}
.chip--done {
  color: var(--ink-900);
  background: var(--celadon-400);
  border-color: var(--celadon-400);
}
.chip--pending {
  color: var(--ink-900);
  background: var(--ember-500);
  border-color: var(--ember-500);
}

/* --- 奶油通栏 --- */
.band {
  position: relative;
  overflow: hidden;
  background: var(--cream-100);
  color: var(--ink-900);
  border-radius: var(--radius-lg);
  padding: clamp(26px, 4.4vw, 46px);
}
.band::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  pointer-events: none;
  background-image: radial-gradient(circle at 1px 1px, rgba(11, 22, 38, 0.28) 1px, transparent 0);
  background-size: 9px 9px;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 70%);
  mask-image: linear-gradient(90deg, transparent, #000 70%);
  opacity: 0.5;
}
.band > * { position: relative; }

.band__kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--amber-700);
  margin-bottom: 10px;
}
.band__title {
  font-size: clamp(21px, 3vw, 30px);
  color: var(--ink-900);
  max-width: 26ch;
}
.band__text {
  margin-top: 12px;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: #2B3B4E;
}

/* --- 时间轴 --- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-left: 26px;
}
.timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: 5px;
  width: 1.5px;
  background: linear-gradient(180deg, var(--celadon-700), rgba(199, 212, 226, 0.18));
}

.timeline__item { position: relative; }

.timeline__dot {
  position: absolute;
  left: -26px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--mist-200);
  border: 2px solid var(--ink-900);
  box-shadow: 0 0 0 1.5px var(--mist-200);
  transition: background 220ms ease-out, box-shadow 220ms ease-out;
}
.timeline__dot--done {
  background: var(--celadon-400);
  box-shadow: 0 0 0 1.5px var(--celadon-400), 0 0 12px rgba(99, 198, 171, 0.45);
}
.timeline__dot--pending {
  background: var(--ember-500);
  box-shadow: 0 0 0 1.5px var(--ember-500), 0 0 12px rgba(224, 106, 60, 0.45);
}

.timeline__time {
  display: block;
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--amber-500);
  letter-spacing: 0.02em;
  margin-bottom: 4px;
}
.timeline__title {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  color: var(--paper-50);
  margin-bottom: 6px;
}
.timeline__text {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist-200);
  max-width: 66ch;
}

/* --- 图片容器基础规则 --- */
.figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--line);
}

.figure__frame {
  position: relative;
  aspect-ratio: 16 / 10;
  background:
    linear-gradient(150deg, rgba(27, 49, 73, 0.95), rgba(11, 22, 38, 0.95)),
    var(--ink-700);
  overflow: hidden;
}
.figure__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(238, 243, 249, 0.06) 0 1px, transparent 1px 3px);
  opacity: 0.7;
}

.figure--wide .figure__frame { aspect-ratio: 21 / 9; }

.figure__caption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--mist-200);
  border-top: 1px solid var(--line);
}

/* --- 面包屑 --- */
.breadcrumbs {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 18px var(--gutter) 0;
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: var(--mist-200);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs__item + .breadcrumbs__item::before {
  content: "/";
  color: rgba(199, 212, 226, 0.45);
}
.breadcrumbs__link {
  color: var(--mist-200);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease-out, border-color 160ms ease-out;
}
.breadcrumbs__link:hover {
  color: var(--amber-500);
  border-bottom-color: var(--amber-700);
}
.breadcrumbs__current {
  color: var(--paper-50);
  font-weight: 700;
}

/* --- 长文 --- */
.prose {
  max-width: 72ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--mist-200);
}
.prose > * + * { margin-top: 18px; }
.prose h2, .prose h3 { color: var(--paper-50); margin-top: 34px; }
.prose h2 { font-size: clamp(22px, 2.8vw, 28px); }
.prose h3 { font-size: 19px; }
.prose strong { color: var(--paper-50); font-weight: 800; }
.prose ul, .prose ol {
  padding-left: 20px;
  list-style: disc;
}
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 8px; }
.prose li::marker { color: var(--amber-500); }
.prose a {
  color: var(--amber-500);
  border-bottom: 1px solid var(--amber-700);
}
.prose blockquote {
  padding: 14px 20px;
  border-left: 3px solid var(--celadon-400);
  background: var(--ink-800);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--paper-50);
}

/* --- 折叠细节 --- */
.disclosure {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  transition: border-color 160ms ease-out;
}
.disclosure + .disclosure { margin-top: 10px; }
.disclosure[open] { border-color: var(--amber-700); }
.disclosure summary {
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 15.5px;
  color: var(--paper-50);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}
.disclosure summary::-webkit-details-marker { display: none; }
.disclosure summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--amber-500);
  font-size: 16px;
  line-height: 1;
}
.disclosure[open] summary::before { content: "–"; }
.disclosure > *:not(summary) {
  margin-top: 12px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist-200);
}

/* --- 返回顶部（JS 注入） --- */
.to-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 90;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--amber-700);
  background: var(--ink-700);
  color: var(--amber-500);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 200ms ease-out, transform 200ms ease-out, background 160ms ease-out;
}
.to-top::before {
  content: "";
  width: 13px;
  height: 13px;
  border-left: 2px solid currentColor;
  border-top: 2px solid currentColor;
  transform: rotate(45deg) translate(2px, 2px);
  border-radius: 2px;
}
.to-top[data-visible] {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.to-top:hover { background: var(--ink-800); border-color: var(--amber-500); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1120px) {
  .site-nav__note { display: none; }
}

@media (max-width: 1023px) {
  .layout-rail {
    grid-template-columns: minmax(0, 1fr);
    gap: 20px;
  }
  .rail {
    position: static;
    padding: 14px 16px;
  }
  .rail__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 6px;
  }
  .rail__link {
    padding: 5px 12px 5px 10px;
    border-radius: var(--radius-pill);
    border: 1px solid var(--line);
    font-size: 13.5px;
  }
  .rail__link::before { display: none; }
  .rail__link:hover { border-color: var(--amber-700); }
  .rail__link[aria-current="true"] {
    background: rgba(240, 176, 60, 0.14);
    border-color: var(--amber-500);
  }
}

@media (max-width: 899px) {
  :root { --nav-h: 64px; }

  .masthead {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas:
      "brand"
      "util"
      "cta";
    justify-items: center;
    text-align: center;
    gap: 12px;
    padding-top: clamp(22px, 6vw, 34px);
  }
  .masthead__utility {
    justify-self: center;
    max-width: 34ch;
    font-size: 12px;
  }
  .masthead__cta { justify-self: center; width: 100%; max-width: 320px; }

  .nav-bar {
    justify-content: space-between;
    padding: 9px var(--gutter) 11px;
  }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 14px var(--gutter) 20px;
    background: var(--ink-800);
    border-bottom: 1px solid var(--line);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: 0 22px 40px rgba(3, 8, 15, 0.55);
  }
  .site-header[data-open] .site-nav { display: flex; }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 6px;
    border-radius: var(--radius-md);
  }
  .site-nav__link {
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    font-size: 16px;
  }
  .site-nav__note {
    display: block;
    text-align: center;
    letter-spacing: 0.16em;
  }

  .site-footer__inner {
    grid-template-columns: minmax(0, 1fr);
  }
  .footer-cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .footer-brand__note { max-width: none; }
}

@media (max-width: 599px) {
  body { font-size: 16px; }

  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 22px; }
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 6px; }

  .card { padding: 17px; }
  .card--wide { grid-column: span 1; }
  .figure--wide .figure__frame { aspect-ratio: 16 / 10; }
  .band { border-radius: var(--radius-md); }
  .to-top { width: 46px; height: 46px; }
}

/* ============================================================
   可访问性：减少动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .card:hover,
  .card:focus-within { transform: none; }
  .to-top { transform: none; }
}