/* ============================================================
   幻影登录指南 · /assets/site.css
   深靛蓝档案底色 / 幻影紫编号 / 电光青交互 / 琥珀金·青瓷绿功能色
   ============================================================ */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, hr { 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; cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid var(--rail); }

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1030;
  --panel: #161E45;
  --rail: #232C5C;
  --violet: #7C5CFF;
  --cyan: #2FD6C6;
  --amber: #F0B429;
  --celadon: #3FBFA0;
  --silver: #C3CBDD;
  --white: #F4F7FC;
  --mist: #E8EDF6;

  --font-display: "Archivo Narrow", "Oswald", "PingFang SC", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  --font-serif: "Source Serif 4", "Noto Serif SC", Georgia, "Songti SC", serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, "Courier New", monospace;

  --rail-w: 96px;
  --header-h: 76px;
  --wrap: 1400px;
  --pad: clamp(20px, 4vw, 64px);
  --shadow-hard: 10px 10px 0 rgba(35, 44, 92, .9);
  --ease: cubic-bezier(.22, .71, .2, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  background: var(--ink);
  color: var(--silver);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* 档案网格底纹：只在页面顶部区域可见 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(35, 44, 92, .55) 1px, transparent 1px),
    linear-gradient(90deg, rgba(35, 44, 92, .55) 1px, transparent 1px);
  background-size: 96px 96px;
  -webkit-mask-image: radial-gradient(120% 55% at 50% 0%, #000 0%, transparent 76%);
  mask-image: radial-gradient(120% 55% at 50% 0%, #000 0%, transparent 76%);
  opacity: .5;
}

main { position: relative; z-index: 1; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--white);
}

strong { color: var(--white); font-weight: 600; }
em { font-style: normal; color: var(--cyan); }
::selection { background: var(--violet); color: var(--white); }

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

/* ---------- 4. 外壳布局工具 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -80px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--violet);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  border: 1px solid var(--cyan);
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 12px; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: currentColor;
}

/* ---------- 5. 编号章节体系 ---------- */
.section {
  position: relative;
  padding-block: clamp(56px, 8vw, 120px);
  border-top: 1px solid var(--rail);
  scroll-margin-top: calc(var(--header-h) + 32px);
}
.section:first-of-type { border-top: 0; }
[data-section] { scroll-margin-top: calc(var(--header-h) + 32px); }

.section-head { margin-bottom: clamp(28px, 4vw, 48px); }
.section-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--violet);
  margin-bottom: 14px;
}
.section-title {
  font-size: clamp(30px, 3.6vw, 56px);
  max-width: 24ch;
}
.section-lede {
  margin-top: 16px;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.5vw, 20px);
  line-height: 1.7;
  color: var(--silver);
  max-width: 58ch;
}

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.85;
  color: var(--silver);
}
.prose > * + * { margin-top: 1.1em; }
.prose h2, .prose h3 { margin-top: 1.8em; font-size: clamp(22px, 2.2vw, 30px); }
.prose ul { margin-top: 1em; }
.prose ul li { position: relative; padding-left: 24px; margin-top: .5em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .82em;
  width: 12px;
  height: 2px;
  background: var(--violet);
}
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(47, 214, 198, .4); }
.prose a:hover { border-bottom-color: var(--cyan); }

/* ---------- 6. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(20px, 2.6vw, 36px);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.grid-12 {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}
@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
}

/* ---------- 7. 索引轨道（页面级，由页面放进 main） ---------- */
.index-rail {
  position: sticky;
  top: calc(var(--header-h) + 40px);
  align-self: start;
}
.rail-nav {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding-left: 2px;
}
.rail-link {
  position: relative;
  display: block;
  padding-left: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: .12em;
  color: var(--silver);
  opacity: .62;
  transition: color .22s var(--ease), opacity .22s var(--ease);
}
.rail-link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 2px;
  bottom: 2px;
  width: 1px;
  background: var(--rail);
  transition: width .24s var(--ease), background-color .24s var(--ease);
}
.rail-link:hover { opacity: 1; color: var(--white); }
.rail-link[aria-current="true"] { opacity: 1; color: var(--white); }
.rail-link[aria-current="true"]::before { width: 3px; background: var(--violet); }

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 26px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  border: 1px solid var(--rail);
  color: var(--white);
  background: transparent;
  transition: background-color .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 rgba(124, 92, 255, .35); }
.btn--primary {
  background: var(--violet);
  border-color: var(--violet);
  color: var(--ink);
  font-weight: 600;
}
.btn--primary:hover { box-shadow: 6px 6px 0 rgba(47, 214, 198, .45); }
.btn--ghost { border-color: var(--rail); color: var(--silver); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--white); }
.btn--quiet {
  padding: 8px 0;
  border: 0;
  border-bottom: 1px solid var(--rail);
  color: var(--silver);
}
.btn--quiet:hover { color: var(--cyan); border-bottom-color: var(--cyan); transform: none; box-shadow: none; }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--silver);
  opacity: .8;
}
.breadcrumb-item { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--rail);
}
.breadcrumb-link:hover { color: var(--cyan); }

/* ---------- 10. 页头 ---------- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 60;
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  background: transparent;
  border-bottom: 1px solid rgba(195, 203, 221, .14);
  transition: background-color .3s var(--ease), border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(11, 16, 48, .96);
  border-bottom-color: var(--rail);
  box-shadow: 0 18px 40px rgba(4, 7, 24, .6);
}

.header-rail {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-right: 1px solid var(--rail);
  background: linear-gradient(180deg, rgba(22, 30, 69, .8), rgba(11, 16, 48, .3));
  overflow: hidden;
  transition: padding .3s var(--ease);
}
.site-header.is-scrolled .header-rail { padding: 8px 0; }
.rail-label {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--silver);
  opacity: .72;
}
.rail-ticks {
  flex: 1 1 auto;
  width: 1px;
  min-height: 12px;
  background: repeating-linear-gradient(to bottom, var(--violet) 0 6px, transparent 6px 16px);
  opacity: .75;
}
.rail-code {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .08em;
  color: var(--violet);
}

.header-body { display: flex; flex-direction: column; min-width: 0; }

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 34px;
  padding: 0 var(--pad);
  border-bottom: 1px solid var(--rail);
  overflow: hidden;
  transition: height .3s var(--ease), opacity .22s var(--ease), border-color .3s var(--ease);
}
.site-header.is-scrolled .header-top {
  height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}
.header-caption {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--silver);
  opacity: .66;
  white-space: nowrap;
}
.utility-list {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  white-space: nowrap;
}
.utility-list--trail { padding-left: 18px; border-left: 1px solid var(--rail); }
.utility-link {
  color: var(--silver);
  opacity: .8;
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color .18s var(--ease), border-color .18s var(--ease), opacity .18s var(--ease);
}
.utility-link:hover { color: var(--cyan); opacity: 1; border-bottom-color: var(--cyan); }

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 0 var(--pad);
  min-height: var(--header-h);
  transition: min-height .3s var(--ease);
}
.site-header.is-scrolled .header-main { min-height: 58px; }

.brand { display: flex; align-items: center; gap: 14px; color: var(--white); }
.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  background: linear-gradient(140deg, var(--violet), var(--cyan));
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  line-height: 1;
  box-shadow: 4px 4px 0 rgba(35, 44, 92, .9);
}
.brand-words { display: flex; flex-direction: column; gap: 2px; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: .01em;
  line-height: 1.15;
  color: var(--white);
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  color: var(--silver);
  opacity: .58;
}

.nav-list { display: flex; align-items: stretch; }
.nav-list > li + li { border-left: 1px solid rgba(35, 44, 92, .9); }
.nav-link {
  position: relative;
  display: block;
  padding: 10px 18px;
  font-size: 15px;
  color: var(--silver);
  opacity: .86;
  transition: color .2s var(--ease), opacity .2s var(--ease), background-color .2s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 4px;
  height: 2px;
  background: var(--violet);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s var(--ease), background-color .24s var(--ease);
}
.nav-link:hover { color: var(--white); opacity: 1; }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--white); opacity: 1; }
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--cyan); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border: 1px solid var(--rail);
  color: var(--white);
  background: var(--panel);
}
.nav-toggle-bar {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
}
.nav-toggle-bar::before,
.nav-toggle-bar::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform .22s var(--ease), top .22s var(--ease);
}
.nav-toggle-bar::before { top: -6px; }
.nav-toggle-bar::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bar::after { top: 0; transform: rotate(-45deg); }
.nav-toggle-text {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
}

.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 50;
  background: rgba(8, 12, 36, .74);
  opacity: 0;
  visibility: hidden;
  transition: opacity .24s var(--ease), visibility .24s var(--ease);
}
.nav-scrim.is-open { opacity: 1; visibility: visible; }

/* ---------- 11. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(64px, 9vw, 140px);
  background: linear-gradient(180deg, var(--ink) 0%, #080C24 100%);
  color: var(--silver);
}
.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg,
    var(--amber) 0 33.33%,
    var(--cyan) 33.33% 66.66%,
    var(--violet) 66.66% 100%);
}
.footer-inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(44px, 6vw, 84px) var(--pad) clamp(28px, 4vw, 48px);
}
.footer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: clamp(24px, 3vw, 36px);
}
.footer-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--violet);
  margin-bottom: 14px;
}
.footer-brand-name {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 42px);
  line-height: 1.05;
  letter-spacing: -.02em;
  color: var(--white);
}
.footer-brand-name:hover { color: var(--cyan); }
.footer-brand-note {
  margin-top: 14px;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
  opacity: .78;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: clamp(28px, 4vw, 52px);
  padding: clamp(32px, 5vw, 52px) 0;
  border-top: 1px solid var(--rail);
  border-bottom: 1px solid var(--rail);
}
.footer-col { min-width: 0; }
.footer-col-title {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 15px;
  letter-spacing: .04em;
  color: var(--white);
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--rail);
}
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-link {
  display: inline-block;
  font-size: 14px;
  color: var(--silver);
  opacity: .86;
  transition: color .18s var(--ease), opacity .18s var(--ease);
}
.footer-link::before {
  content: "—";
  color: var(--rail);
  margin-right: 10px;
  transition: color .18s var(--ease);
}
.footer-link:hover { color: var(--cyan); opacity: 1; }
.footer-link:hover::before { color: var(--cyan); }

.footer-col--contact { max-width: 340px; }
.contact-list { display: flex; flex-direction: column; gap: 14px; }
.contact-line { display: flex; flex-direction: column; gap: 3px; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--violet);
}
.contact-value {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--white);
  word-break: break-word;
}
.contact-note {
  margin-top: 18px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--silver);
  opacity: .7;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 28px;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 22px var(--pad) clamp(32px, 4vw, 48px);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--silver);
}
.legal-icp { opacity: .78; }
.legal-nav { display: flex; flex-wrap: wrap; gap: 18px; }
.legal-link { color: var(--silver); opacity: .78; }
.legal-link:hover { color: var(--cyan); opacity: 1; }
.legal-year { color: var(--silver); opacity: .58; }

/* ---------- 12. 数据表 / 标签 / 展开组 ---------- */
.data-table { font-size: 14px; }
.data-table th {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: .14em;
  text-transform: uppercase;
  text-align: left;
  color: var(--silver);
  padding: 12px 16px;
  border-bottom: 1px solid var(--rail);
  white-space: nowrap;
}
.data-table td {
  height: 44px;
  padding: 0 16px;
  border-bottom: 1px solid rgba(35, 44, 92, .7);
  color: var(--silver);
  vertical-align: middle;
}
.data-table tbody tr { transition: background-color .16s var(--ease); }
.data-table tbody tr:hover td { background: rgba(124, 92, 255, .1); color: var(--white); }
.data-table .num {
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}
.data-table .mono { font-family: var(--font-mono); letter-spacing: 0; color: var(--white); }

.tag {
  display: inline-block;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  line-height: 1.6;
  border: 1px solid currentColor;
  white-space: nowrap;
}
.tag--amber { color: var(--amber); }
.tag--celadon { color: var(--celadon); }
.tag--cyan { color: var(--cyan); }
.tag--violet { color: var(--violet); }

.disclosure { border-top: 1px solid var(--rail); }
.disclosure-item {
  position: relative;
  border-bottom: 1px solid var(--rail);
}
.disclosure-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 20px 0;
  text-align: left;
  font-family: var(--font-serif);
  font-size: clamp(16px, 1.6vw, 20px);
  line-height: 1.5;
  color: var(--white);
  transition: color .18s var(--ease);
}
.disclosure-toggle:hover { color: var(--cyan); }
.disclosure-arrow {
  flex: none;
  width: 12px;
  height: 12px;
  border-right: 2px solid var(--violet);
  border-bottom: 2px solid var(--violet);
  transform: rotate(45deg);
  transition: transform .22s var(--ease), border-color .22s var(--ease);
}
.disclosure-toggle[aria-expanded="true"] .disclosure-arrow {
  transform: rotate(225deg);
  border-color: var(--cyan);
}
.disclosure-panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows .22s var(--ease);
}
.disclosure-toggle[aria-expanded="true"] + .disclosure-panel { grid-template-rows: 1fr; }
.disclosure-inner {
  overflow: hidden;
  padding-left: 22px;
  border-left: 2px solid transparent;
  transition: border-color .22s var(--ease);
}
.disclosure-inner > *:last-child { padding-bottom: 22px; }
.disclosure-item[data-open] .disclosure-inner { border-left-color: var(--violet); }
.disclosure-item[data-tone="cyan"][data-open] .disclosure-inner { border-left-color: var(--cyan); }
.disclosure-item[data-tone="amber"][data-open] .disclosure-inner { border-left-color: var(--amber); }
.disclosure-item[data-tone="celadon"][data-open] .disclosure-inner { border-left-color: var(--celadon); }

/* ---------- 13. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--rail);
  box-shadow: var(--shadow-hard);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.7) contrast(1.08) brightness(.9);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(150deg, rgba(124, 92, 255, .2), rgba(11, 16, 48, .6) 58%);
}
.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-1x1 { aspect-ratio: 1 / 1; }
.ratio-3x4 { aspect-ratio: 3 / 4; }
.media-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--silver);
  opacity: .7;
}

/* ---------- 14. 显现 ---------- */
.reveal { transition: opacity .55s var(--ease), transform .55s var(--ease); }
.reveal.is-pending { opacity: 0; transform: translateY(16px); }
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- 15. 响应式 ---------- */
@media (max-width: 1200px) {
  :root { --rail-w: 76px; }
  .header-caption { display: none; }
}

@media (max-width: 960px) {
  :root { --header-h: 62px; }
  body.is-nav-open { overflow: hidden; }

  .site-header { grid-template-columns: minmax(0, 1fr); }
  .header-rail { display: none; }
  .header-top { display: none; }
  .header-main { min-height: var(--header-h); padding: 0 var(--pad); }
  .brand-mark { width: 32px; height: 32px; font-size: 15px; }
  .brand-name { font-size: 15px; }
  .brand-sub { display: none; }

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

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    z-index: 55;
    width: min(380px, 86vw);
    height: 100vh;
    height: 100dvh;
    padding: calc(var(--header-h) + 28px) 24px 32px;
    background: var(--panel);
    border-left: 1px solid var(--rail);
    box-shadow: -14px 0 0 rgba(124, 92, 255, .14);
    overflow-y: auto;
    transform: translateX(102%);
    transition: transform .3s var(--ease);
  }
  .site-nav[data-open] { transform: none; }
  .nav-list { flex-direction: column; }
  .nav-list > li + li { border-left: 0; border-top: 1px solid var(--rail); }
  .nav-link { padding: 16px 4px; font-size: 18px; }
  .nav-link::after { left: 4px; right: auto; width: 42px; bottom: 8px; }

  .footer-legal { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .brand-name { font-size: 14px; }
  .utility-list { gap: 12px; }
  .section-title { max-width: none; }
  .data-table th, .data-table td { padding-inline: 10px; }
}

/* ---------- 16. 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;
  }
  .reveal, .reveal.is-pending { opacity: 1; transform: none; }
  .btn:hover { transform: none; }
}