/* ============================================================
   大神棋牌 · /assets/site.css
   夜海牌桌主题：墨蓝底 / 霓虹青数据 / 珊瑚编号 / 象牙正文
   ============================================================ */

/* ---------- 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, h6,
p, ul, ol, li, figure, blockquote, dl, dd, dt { margin: 0; }

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

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

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

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

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

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

address { font-style: normal; }

:where(a, button, [tabindex], summary):focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

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

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink: #070B18;
  --panel: #0F1B36;
  --moss: #0A211D;
  --felt: #1E7A5E;
  --cyan: #45E0FF;
  --green: #2FD8A0;
  --coral: #FF6B4A;
  --amber: #F5B942;
  --ivory: #F4F0E6;
  --mist: #97A4B8;

  --line: rgba(244, 240, 230, 0.12);
  --line-strong: rgba(244, 240, 230, 0.22);
  --cyan-line: rgba(69, 224, 255, 0.30);

  --bw: 2px;
  --bw-thick: 4px;

  --shell: 1240px;
  --shell-narrow: 900px;
  --gutter: 24px;

  --shadow-hard: 0 16px 40px rgba(0, 0, 0, 0.52);
  --shadow-lift: 0 20px 44px rgba(0, 0, 0, 0.58);

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --t-fast: 180ms;
  --t-mid: 240ms;
  --t-slow: 280ms;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.85;
  color: var(--ivory);
  background-color: var(--ink);
  background-image:
    radial-gradient(920px 540px at 10% -10%, rgba(69, 224, 255, 0.10), transparent 62%),
    radial-gradient(780px 470px at 94% 2%, rgba(30, 122, 94, 0.24), transparent 68%),
    repeating-linear-gradient(115deg, rgba(244, 240, 230, 0.014) 0 2px, transparent 2px 7px);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.28;
  letter-spacing: 0.01em;
}

h1 { font-size: clamp(30px, 4.4vw, 52px); }
h2 { font-size: clamp(24px, 2.8vw, 34px); }
h3 { font-size: clamp(18px, 2vw, 22px); }
h4 { font-size: 17px; }

p { line-height: 1.9; }

strong { color: var(--ivory); font-weight: 700; }

::selection { background: rgba(69, 224, 255, 0.28); color: var(--ivory); }

/* ---------- 4. 容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

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

#main-content {
  display: block;
  padding-top: 132px;
}

#main-content[data-hero="overlay"] { padding-top: 0; }

/* ---------- 5. 通用文字与装饰 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.lede {
  max-width: 68ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.9;
  color: rgba(244, 240, 230, 0.86);
}

.prose {
  max-width: 72ch;
  color: rgba(244, 240, 230, 0.9);
  line-height: 1.95;
}

.prose p + p { margin-top: 16px; }
.prose h3 { margin-top: 30px; margin-bottom: 10px; }
.prose h4 { margin-top: 22px; margin-bottom: 8px; color: var(--cyan); }

.num {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
}

.divider {
  height: var(--bw);
  border: 0;
  margin: 40px 0;
  background: repeating-linear-gradient(90deg, var(--line-strong) 0 12px, transparent 12px 22px);
}

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border: var(--bw) solid var(--cyan);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
  background: transparent;
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease),
    background-color var(--t-fast) linear, color var(--t-fast) linear;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(69, 224, 255, 0.35);
}

.btn--primary {
  background: var(--cyan);
  color: #04121A;
  box-shadow: 5px 5px 0 rgba(255, 107, 74, 0.5);
}

.btn--primary:hover {
  background: var(--green);
  border-color: var(--green);
  box-shadow: 8px 8px 0 rgba(255, 107, 74, 0.62);
}

.btn--ghost {
  border-color: rgba(244, 240, 230, 0.32);
  color: var(--ivory);
}

.btn--ghost:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  box-shadow: 6px 6px 0 rgba(69, 224, 255, 0.24);
}

.btn--sm { padding: 8px 14px; font-size: 13px; }

/* ---------- 7. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: var(--bw) solid currentColor;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
}

.tag--live { color: var(--green); }
.tag--warn { color: var(--amber); }
.tag--info { color: var(--cyan); }

/* ---------- 8. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  color: var(--ivory);
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--cyan);
  color: #04121A;
  font-weight: 700;
  border: var(--bw) solid #04121A;
  transform: translateY(-180%);
  transition: transform var(--t-fast) var(--ease);
}

.skip-link:focus { transform: translateY(0); }

/* 状态带 */
.status-strip {
  height: 34px;
  overflow: hidden;
  border-bottom: 1px solid rgba(244, 240, 230, 0.10);
  background: linear-gradient(90deg, rgba(10, 33, 29, 0.94), rgba(15, 27, 54, 0.94));
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  transition: height var(--t-mid) var(--ease), opacity 200ms linear,
    border-color var(--t-mid) linear;
}

.status-strip__inner {
  display: flex;
  align-items: center;
  gap: 12px;
  height: 34px;
}

.status-strip__dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(47, 216, 160, 0.18);
  animation: status-pulse 2.6s ease-in-out infinite;
}

@keyframes status-pulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 3px rgba(47, 216, 160, 0.18); }
  50% { opacity: 0.6; box-shadow: 0 0 0 6px rgba(47, 216, 160, 0.05); }
}

.status-strip__text {
  color: var(--ivory);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.status-strip__hint {
  margin-left: auto;
  color: var(--cyan);
  white-space: nowrap;
}

/* 导航条 */
.header-bar {
  position: relative;
  z-index: 2;
  border-bottom: var(--bw) solid transparent;
  background: linear-gradient(180deg, rgba(7, 11, 24, 0.78), rgba(7, 11, 24, 0));
  transition: background-color var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease),
    box-shadow var(--t-mid) var(--ease);
}

.header-bar__inner {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 78px;
  transition: height var(--t-mid) var(--ease);
}

.site-header[data-stuck] .status-strip {
  height: 0;
  opacity: 0;
  border-color: transparent;
}

.site-header[data-stuck] .header-bar {
  background: rgba(7, 11, 24, 0.96);
  border-bottom-color: var(--cyan-line);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.58);
}

.site-header[data-stuck] .header-bar__inner { height: 64px; }

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: none;
}

.brand__mark {
  display: grid;
  grid-template-columns: repeat(3, 6px);
  gap: 3px;
  align-items: end;
  height: 24px;
}

.brand__mark i {
  display: block;
  width: 6px;
  border-radius: 1px;
  background: var(--cyan);
}

.brand__mark i:nth-child(1) { height: 14px; background: var(--green); }
.brand__mark i:nth-child(2) { height: 24px; }
.brand__mark i:nth-child(3) { height: 18px; background: var(--coral); }

.brand__text { display: block; }

.brand__name {
  display: block;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.06em;
}

.brand__note {
  display: block;
  margin-top: 3px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* 主导航 */
.primary-nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.primary-nav__item { position: relative; }

.primary-nav__link {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 5px;
  padding: 10px 11px;
  border-radius: 2px;
  font-size: 15px;
  font-weight: 500;
  color: rgba(244, 240, 230, 0.84);
  transition: color var(--t-fast) linear, background-color var(--t-fast) linear;
}

.primary-nav__num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--coral);
}

.primary-nav__link:hover {
  color: var(--cyan);
  background: rgba(69, 224, 255, 0.08);
}

.primary-nav__link[aria-current="page"] { color: var(--cyan); }

.primary-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 11px;
  right: 11px;
  bottom: 2px;
  height: var(--bw);
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(69, 224, 255, 0.8);
}

.primary-nav__utility {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-left: 10px;
  padding-left: 16px;
  border-left: 1px solid rgba(244, 240, 230, 0.16);
}

.utility-link {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  white-space: nowrap;
  transition: color var(--t-fast) linear;
}

.utility-link:hover { color: var(--cyan); }

/* CTA */
.header-cta {
  flex: none;
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: var(--bw) solid var(--cyan);
  background: var(--cyan);
  color: #04121A;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  box-shadow: 4px 4px 0 rgba(255, 107, 74, 0.55);
  transition: transform var(--t-fast) var(--ease), box-shadow var(--t-fast) var(--ease);
}

.header-cta:hover {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(255, 107, 74, 0.78);
}

.header-cta--panel { display: none; }

/* 菜单按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: var(--bw) solid rgba(244, 240, 230, 0.32);
  color: var(--ivory);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: border-color var(--t-fast) linear, color var(--t-fast) linear;
}

.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

.nav-toggle__bars {
  display: grid;
  gap: 4px;
  width: 18px;
}

.nav-toggle__bars i {
  display: block;
  height: var(--bw);
  background: currentColor;
  transition: transform var(--t-mid) var(--ease), opacity var(--t-fast) linear;
}

.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); }

/* 遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: rgba(4, 8, 18, 0.74);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--t-mid) var(--ease);
}

.nav-scrim[hidden] { display: block; }

.site-header[data-open] .nav-scrim {
  opacity: 1;
  pointer-events: auto;
}

/* 阅读进度轨 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: var(--bw);
  overflow: hidden;
  pointer-events: none;
}

.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--green) 58%, var(--coral));
  transition: transform 120ms linear;
}

/* ---------- 9. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 96px;
  padding-bottom: 28px;
  border-top: var(--bw) solid var(--cyan-line);
  color: var(--mist);
  background-color: var(--ink);
  background-image:
    linear-gradient(180deg, rgba(10, 33, 29, 0.94), rgba(7, 11, 24, 1)),
    repeating-linear-gradient(90deg, rgba(244, 240, 230, 0.022) 0 1px, transparent 1px 78px);
}

.footer-rail {
  height: 10px;
  opacity: 0.6;
  background: repeating-linear-gradient(
    90deg,
    rgba(69, 224, 255, 0.85) 0 18px,
    transparent 18px 28px,
    rgba(255, 107, 74, 0.85) 28px 46px,
    transparent 46px 56px
  );
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 0.85fr 0.85fr 0.85fr;
  gap: 40px;
  padding-top: 56px;
  padding-bottom: 36px;
}

.footer-brand__name {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ivory);
}

.footer-brand__note {
  margin-top: 8px;
  max-width: 34ch;
  font-size: 13px;
  line-height: 1.85;
}

.footer-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 430px;
  margin-top: 22px;
}

.footer-fact {
  margin: 0;
  padding: 10px 12px;
  border: var(--bw) solid var(--line);
  border-top: var(--bw-thick) solid var(--coral);
  background: rgba(7, 11, 24, 0.55);
}

.footer-fact__key {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.footer-fact__val {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 700;
  color: var(--ivory);
}

.footer-col__title {
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: var(--bw) solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.footer-col__list { display: grid; gap: 10px; }

.footer-link {
  font-size: 14px;
  color: rgba(244, 240, 230, 0.82);
  transition: color var(--t-fast) linear;
}

.footer-link:hover { color: var(--cyan); }

.footer-link--strong { color: var(--ivory); }

.footer-contact {
  display: grid;
  gap: 8px;
  padding-top: 26px;
  padding-bottom: 26px;
  border-top: var(--bw) solid var(--line);
}

.footer-contact__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--coral);
}

.footer-contact__line { font-size: 14px; }

.footer-contact__strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--ivory);
  word-break: break-all;
}

.footer-contact__note {
  max-width: 62ch;
  font-size: 12px;
  line-height: 1.85;
  color: var(--mist);
}

.footer-contact .btn { justify-self: start; margin-top: 8px; }

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding-top: 18px;
  border-top: var(--bw) solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.footer-legal__icp { color: var(--mist); }
.footer-legal__copy { color: var(--mist); }

.to-top {
  margin-left: auto;
  padding: 8px 14px;
  border: var(--bw) solid rgba(244, 240, 230, 0.28);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--t-mid) var(--ease), transform var(--t-mid) var(--ease),
    color var(--t-fast) linear, border-color var(--t-fast) linear, visibility var(--t-mid);
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.to-top:hover { color: var(--cyan); border-color: var(--cyan); }

/* ---------- 10. 页面通用组件 ---------- */
.page-head {
  position: relative;
  padding-top: 24px;
  padding-bottom: 34px;
  border-bottom: var(--bw) solid var(--line);
}

.page-head__title { margin-top: 12px; max-width: 22ch; }

.breadcrumb { margin-bottom: 18px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.breadcrumb__link { color: var(--mist); transition: color var(--t-fast) linear; }
.breadcrumb__link:hover { color: var(--cyan); }

.breadcrumb__sep { color: rgba(151, 164, 184, 0.55); }

.breadcrumb__current { color: var(--cyan); }

/* 编号章节 */
.section { position: relative; }
.section + .section { margin-top: 80px; }

.section__head {
  position: relative;
  margin-bottom: 26px;
  padding: 0 0 16px 66px;
  border-bottom: var(--bw) solid var(--line);
}

.section__num {
  position: absolute;
  left: 0;
  top: -6px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3vw, 38px);
  font-weight: 700;
  line-height: 1;
  color: var(--coral);
}

.section__title { max-width: 26ch; }

.section__lead {
  margin-top: 10px;
  max-width: 66ch;
  color: var(--mist);
}

/* 网格 */
.grid { display: grid; gap: 32px; }
.grid--7-5 { grid-template-columns: 7fr 5fr; }
.grid--5-7 { grid-template-columns: 5fr 7fr; }
.grid--halves { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--thirds { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

/* 面板 */
.panel {
  padding: 24px;
  border: var(--bw) solid var(--line);
  background: rgba(15, 27, 54, 0.72);
  box-shadow: var(--shadow-hard);
}

.panel--felt {
  border-color: rgba(30, 122, 94, 0.55);
  background: linear-gradient(150deg, rgba(30, 122, 94, 0.26), rgba(15, 27, 54, 0.9));
}

.panel--moss {
  border-color: rgba(244, 240, 230, 0.10);
  background: linear-gradient(180deg, rgba(10, 33, 29, 0.9), rgba(15, 27, 54, 0.86));
}

/* 统计 */
.stat {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  border: var(--bw) solid var(--line);
  border-left: var(--bw-thick) solid var(--cyan);
  background: rgba(7, 11, 24, 0.6);
}

.stat__value {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 44px);
  font-weight: 700;
  line-height: 1;
  color: var(--ivory);
  font-variant-numeric: tabular-nums;
}

.stat__unit { font-size: 0.42em; font-weight: 700; color: var(--cyan); }

.stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* 筹码轨道长条卡 */
.rail-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 16px 20px;
  border: var(--bw) solid var(--line);
  border-left: var(--bw-thick) solid var(--cyan);
  background: linear-gradient(90deg, rgba(30, 122, 94, 0.22), rgba(15, 27, 54, 0.9));
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) linear,
    box-shadow var(--t-fast) var(--ease);
}

.rail-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-lift);
}

.rail-card__index {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--coral);
}

.rail-card__title { font-size: 16px; font-weight: 700; color: var(--ivory); }

.rail-card__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* 可折叠牌墙 */
.fold-set { display: grid; gap: 12px; }

.fold-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 14px;
}

.fold {
  border: var(--bw) solid var(--line);
  background: rgba(15, 27, 54, 0.6);
  transition: border-color var(--t-fast) linear;
}

.fold[data-open] { border-color: var(--cyan-line); }

.fold__head {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 16px 18px;
  text-align: left;
  color: var(--ivory);
  transition: background-color var(--t-fast) linear;
}

.fold__head:hover { background: rgba(69, 224, 255, 0.06); }

.fold__title { font-size: 16px; font-weight: 700; }

.fold__meta {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
  white-space: nowrap;
}

.fold__chev {
  flex: none;
  width: 10px;
  height: 10px;
  border-right: var(--bw) solid var(--cyan);
  border-bottom: var(--bw) solid var(--cyan);
  transform: rotate(45deg);
  transition: transform var(--t-mid) var(--ease);
}

.fold[data-open] .fold__chev { transform: rotate(-135deg); }

.fold__body { overflow: hidden; }

.fold__inner {
  padding: 4px 18px 20px;
  border-top: 1px solid var(--line);
  color: rgba(244, 240, 230, 0.88);
}

.has-js .fold__body {
  max-height: 0;
  transition: max-height var(--t-mid) var(--ease);
}

/* 规则条文 */
.rule-list { counter-reset: rule; display: grid; gap: 10px; }

.rule-list li {
  position: relative;
  counter-increment: rule;
  padding-left: 46px;
  line-height: 2;
  color: rgba(244, 240, 230, 0.88);
}

.rule-list li::before {
  content: counter(rule, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0.45em;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--coral);
}

/* 控制台状态面板 */
.console {
  border: var(--bw) solid var(--cyan-line);
  background: rgba(7, 11, 24, 0.72);
  font-family: var(--font-mono);
}

.console__row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 16px;
  font-size: 13px;
}

.console__row + .console__row { border-top: 1px dashed var(--line); }

.console__key { color: var(--mist); }
.console__val { color: var(--cyan); font-weight: 700; }

/* 锚点目录 */
.toc {
  padding: 18px 20px;
  border: var(--bw) solid var(--line);
  border-top: var(--bw-thick) solid var(--cyan);
  background: rgba(15, 27, 54, 0.6);
}

.toc__title {
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.toc__list { display: grid; gap: 8px; }

.toc__link {
  display: block;
  padding: 5px 0 5px 12px;
  border-left: var(--bw) solid transparent;
  font-size: 14px;
  color: var(--mist);
  transition: color var(--t-fast) linear, border-color var(--t-fast) linear;
}

.toc__link:hover { color: var(--ivory); }

.toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

/* 数据表 */
.data-table__wrap {
  overflow-x: auto;
  border: var(--bw) solid var(--line);
  background: rgba(15, 27, 54, 0.55);
}

.data-table { min-width: 560px; font-size: 14px; }

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.data-table thead th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
  background: rgba(7, 11, 24, 0.72);
}

.data-table tbody tr { transition: background-color var(--t-fast) linear; }
.data-table tbody tr:hover { background: rgba(69, 224, 255, 0.06); }

.data-table td:first-child {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--coral);
}

/* 图片容器 */
.media-frame {
  position: relative;
  overflow: hidden;
  border: var(--bw) solid var(--line);
  background: linear-gradient(135deg, var(--panel), var(--moss));
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.95);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 38%;
  pointer-events: none;
  background: linear-gradient(180deg, transparent, rgba(7, 11, 24, 0.72));
}

.media-frame--wide { aspect-ratio: 16 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

/* 显现 */
.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
}

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

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1180px) {
  .primary-nav__num { display: none; }
  .primary-nav__link { font-size: 14px; padding: 10px 9px; }
  .primary-nav__utility { gap: 10px; padding-left: 12px; margin-left: 6px; }
}

@media (max-width: 1023px) {
  :root { --gutter: 20px; }

  .header-bar__inner { height: 66px; }
  .site-header[data-stuck] .header-bar__inner { height: 60px; }
  .status-strip { height: 30px; font-size: 11px; }
  .status-strip__inner { height: 30px; }
  .status-strip__hint { display: none; }

  .header-cta { display: none; }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .header-cta--panel {
    display: inline-flex;
    justify-content: center;
    margin-top: 24px;
  }

  .primary-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 3;
    width: min(360px, 86vw);
    margin-left: 0;
    padding: 96px 22px 32px;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow-y: auto;
    border-left: var(--bw) solid var(--cyan-line);
    background: linear-gradient(180deg, var(--panel), var(--moss));
    box-shadow: -24px 0 60px rgba(0, 0, 0, 0.62);
    transform: translateX(102%);
    transition: transform var(--t-slow) var(--ease);
  }

  .site-header[data-open] .primary-nav { transform: translateX(0); }

  .primary-nav__list { flex-direction: column; align-items: stretch; gap: 0; }

  .primary-nav__link {
    justify-content: space-between;
    padding: 15px 4px;
    font-size: 17px;
    border-bottom: 1px solid var(--line);
    border-radius: 0;
  }

  .primary-nav__num { display: inline; font-size: 11px; }

  .primary-nav__link[aria-current="page"] {
    background: rgba(69, 224, 255, 0.08);
    padding-inline: 10px;
  }

  .primary-nav__link[aria-current="page"]::after { display: none; }

  .primary-nav__utility {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    margin: 24px 0 0;
    padding: 20px 0 0;
    border-left: 0;
    border-top: 1px solid rgba(244, 240, 230, 0.16);
  }

  .utility-link { font-size: 13px; }

  #main-content { padding-top: 110px; }

  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 900px) {
  .grid,
  .grid--7-5,
  .grid--5-7,
  .grid--halves,
  .grid--thirds { grid-template-columns: 1fr; gap: 24px; }

  .section + .section { margin-top: 56px; }
  .section__head { padding-left: 52px; }
}

@media (max-width: 640px) {
  body { font-size: 16px; line-height: 1.8; }

  .brand__note { display: none; }
  .brand__name { font-size: 18px; }
  .nav-toggle__label { display: none; }

  #main-content { padding-top: 98px; }

  .section__head { padding-left: 0; padding-top: 40px; }
  .section__num { top: 0; font-size: 26px; }

  .footer-grid { grid-template-columns: 1fr; padding-top: 40px; }
  .footer-facts { grid-template-columns: 1fr; max-width: none; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
  .to-top { margin-left: 0; }

  .rail-card { grid-template-columns: auto 1fr; row-gap: 6px; }
  .rail-card__meta { grid-column: 2; }

  .stat__value { font-size: 28px; }
}

/* ---------- 12. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .has-js [data-reveal] { opacity: 1; transform: none; }
  .to-top { transform: none; }
  .btn:hover,
  .header-cta:hover,
  .rail-card:hover { transform: none; }
}