/* =========================================================
   韦德亚洲 · 共享样式 /assets/site.css
   面板切片构图 · 双层信息导航 · 矿物色档案体系
   ========================================================= */

/* ---------- 1. 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body, h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; }
ul[class], ol[class] { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }
::selection { background: var(--cyan); color: var(--ink-900); }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #0B1D2E;
  --ink-800: #122A40;
  --ink-700: #0A1622;
  --cyan: #35E0D0;
  --amber: #F2A33C;
  --sand: #C9B9A3;
  --paper: #F5F3EE;
  --slate: #6E879C;
  --moss: #4FA88B;
  --clay: #E4694F;

  --line: rgba(201, 185, 163, .20);
  --line-soft: rgba(201, 185, 163, .11);
  --line-cyan: rgba(53, 224, 208, .38);
  --line-amber: rgba(242, 163, 60, .42);

  --shell: 1240px;
  --pad: clamp(18px, 4.2vw, 56px);
  --ease: cubic-bezier(.22, .61, .36, 1);
  --cut: polygon(0 0, calc(100% - 22px) 0, 100% 22px, 100% 100%, 22px 100%, 0 calc(100% - 22px));

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 560px at 84% -12%, rgba(53, 224, 208, .10), transparent 60%),
    radial-gradient(880px 500px at -12% 18%, rgba(242, 163, 60, .07), transparent 65%),
    repeating-linear-gradient(90deg, rgba(201, 185, 163, .045) 0 1px, transparent 1px 96px);
  color: var(--sand);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  color: var(--paper);
  font-weight: 800;
  letter-spacing: -.02em;
  line-height: 1.08;
}
h1 { font-size: clamp(40px, 6vw, 96px); line-height: 1.05; }
h2 { font-size: clamp(22px, 2.4vw, 34px); font-weight: 700; line-height: 1.25; }
h3 { font-size: clamp(17px, 1.5vw, 20px); font-weight: 700; line-height: 1.35; letter-spacing: -.01em; }

p { max-width: 76ch; }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.dot {
  display: inline-block;
  width: 6px; height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(53, 224, 208, .16);
}

/* ---------- 4. 版心与章节 ---------- */
.page-shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--pad);
}
.section { padding-block: clamp(40px, 7vw, 96px); }
.section--paper { background: var(--paper); color: var(--ink-700); }
.section--paper h2, .section--paper h3 { color: var(--ink-700); }
.section__head { display: grid; gap: 12px; margin-bottom: clamp(20px, 3vw, 34px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: .75em;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .2em;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}
.section--paper .eyebrow { color: #1F7A72; }
.section--paper .eyebrow::before { background: linear-gradient(90deg, #1F7A72, transparent); }

.lede {
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.7;
  color: rgba(245, 243, 238, .82);
  max-width: 60ch;
}
.section--paper .lede { color: rgba(10, 22, 34, .78); }

.rule { height: 1px; border: 0; margin-block: clamp(20px, 3vw, 36px);
  background: linear-gradient(90deg, var(--line-cyan), var(--line-soft) 45%, transparent); }

/* ---------- 5. 网格 ---------- */
.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(14px, 2vw, 28px); }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }
.stack { display: grid; gap: clamp(12px, 1.8vw, 22px); }
.stack--tight { gap: 8px; }

/* ---------- 6. 面板 ---------- */
.panel {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: clamp(20px, 3vw, 40px);
  overflow: hidden;
}
.panel--cut { clip-path: var(--cut); }
.panel--paper { background: var(--paper); border-color: rgba(10, 22, 34, .12); color: var(--ink-700); }
.panel--paper h2, .panel--paper h3 { color: var(--ink-700); }
.panel::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, var(--cyan), transparent 55%);
  opacity: .5;
  pointer-events: none;
}
.panel__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .18em;
  color: var(--cyan);
  margin-bottom: 10px;
}
.panel__title { margin-bottom: 10px; }
.panel__text { font-size: 15.5px; line-height: 1.78; color: rgba(201, 185, 163, .92); }
.panel--paper .panel__text { color: rgba(10, 22, 34, .78); }
.panel__foot {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px;
  margin-top: clamp(16px, 2.4vw, 26px);
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  padding: .72em 1.2em;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--paper);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: .02em;
  line-height: 1.2;
  background: rgba(18, 42, 64, .45);
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}
.btn:hover { color: var(--cyan); border-color: var(--line-cyan); }
.btn--cyan { color: var(--cyan); border-color: var(--line-cyan); }
.btn--cyan:hover { background: var(--cyan); color: var(--ink-900); border-color: var(--cyan); }
.btn--amber { color: var(--amber); border-color: var(--line-amber); }
.btn--amber:hover { background: var(--amber); color: var(--ink-900); border-color: var(--amber); }
.btn--ghost { background: transparent; color: var(--sand); }
.btn--ghost:hover { color: var(--paper); border-color: var(--sand); }

/* ---------- 8. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: .45em;
  padding: .3em .6em;
  border: 1px solid var(--line);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .16em;
  line-height: 1.4;
  color: var(--sand);
}
.tag--cyan { color: var(--cyan); border-color: var(--line-cyan); background: rgba(53, 224, 208, .08); }
.tag--amber { color: var(--amber); border-color: var(--line-amber); background: rgba(242, 163, 60, .09); }
.tag--moss { color: var(--moss); border-color: rgba(79, 168, 139, .45); background: rgba(79, 168, 139, .09); }

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55em;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--slate);
  padding-block: 18px;
}
.breadcrumbs__link { color: var(--sand); border-bottom: 1px solid transparent; transition: color .18s var(--ease), border-color .18s var(--ease); }
.breadcrumbs__link:hover { color: var(--cyan); border-bottom-color: var(--line-cyan); }
.breadcrumbs__sep { color: var(--slate); opacity: .7; }
.breadcrumbs__current { color: var(--cyan); }

/* ---------- 10. 侧边索引 ---------- */
.rail {
  position: sticky;
  top: 84px;
  align-self: start;
  border-left: 1px solid var(--line);
  padding-left: 16px;
}
.rail__list { display: grid; gap: 2px; }
.rail__item { position: relative; }
.rail__link {
  display: block;
  padding: 7px 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: var(--slate);
  transition: color .18s var(--ease), padding-left .18s var(--ease);
}
.rail__link::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 50%;
  width: 6px; height: 1px;
  background: var(--cyan);
  opacity: 0;
  transition: opacity .18s var(--ease), width .18s var(--ease);
}
.rail__link:hover { color: var(--paper); }
.rail__link.is-active { color: var(--cyan); padding-left: 4px; }
.rail__link.is-active::before { opacity: 1; width: 11px; }

/* ---------- 11. 图片容器（页面阶段放图） ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  background-color: var(--ink-800);
  background-image:
    linear-gradient(145deg, rgba(53, 224, 208, .12), rgba(18, 42, 64, .92) 55%, rgba(242, 163, 60, .12)),
    repeating-linear-gradient(90deg, rgba(201, 185, 163, .10) 0 1px, transparent 1px 30px),
    repeating-linear-gradient(0deg, rgba(201, 185, 163, .07) 0 1px, transparent 1px 30px);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 48%, rgba(53, 224, 208, .22) 49%, transparent 50.4%);
  pointer-events: none;
}
.media-frame__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame__caption {
  position: absolute;
  left: 0; bottom: 0;
  z-index: 2;
  padding: .5em .85em;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--sand);
  background: rgba(11, 29, 46, .8);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

/* ---------- 12. 长文 ---------- */
.prose { max-width: 68ch; font-size: 16.5px; line-height: 1.8; color: rgba(245, 243, 238, .80); }
.prose p + p { margin-top: 1.1em; }
.prose h2, .prose h3 { margin-top: 1.6em; margin-bottom: .5em; }
.prose strong { color: var(--paper); font-weight: 700; }
.prose ul { display: grid; gap: .5em; padding-left: 0; }
.prose ul li { position: relative; padding-left: 1.5em; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0; top: .78em;
  width: 8px; height: 1px;
  background: var(--cyan);
}
.prose a { color: var(--cyan); border-bottom: 1px solid var(--line-cyan); }
.panel--paper .prose, .section--paper .prose { color: rgba(10, 22, 34, .82); }
.panel--paper .prose h2, .panel--paper .prose h3, .panel--paper .prose strong,
.section--paper .prose h2, .section--paper .prose h3, .section--paper .prose strong { color: var(--ink-700); }
.panel--paper .prose a, .section--paper .prose a { color: #146B64; border-bottom-color: rgba(10, 22, 34, .3); }
.panel--paper :focus-visible, .section--paper :focus-visible { outline-color: var(--ink-700); }

/* ---------- 13. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--cyan);
  color: var(--ink-900);
  font-size: 13px;
  font-weight: 700;
  border-radius: 2px;
  transition: top .18s var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 14. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 50;
  background: var(--ink-900);
}
.header-strip {
  background: var(--ink-700);
  border-bottom: 1px solid var(--line-soft);
}
.header-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 40px;
  padding-block: 7px;
}
.header-strip__note {
  display: inline-flex;
  align-items: center;
  gap: .6em;
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .18em;
  color: var(--sand);
}
.header-strip__version {
  margin: 0;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--slate);
}
.header-strip__cta {
  flex: 0 0 auto;
  padding: .45em .95em;
  background: var(--amber);
  color: var(--ink-900);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  line-height: 1.3;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  transition: background-color .18s var(--ease), color .18s var(--ease);
}
.header-strip__cta:hover { background: var(--cyan); color: var(--ink-700); }

.header-main {
  position: relative;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, var(--ink-900) 0%, #0E2438 100%);
}
.header-main::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(90deg, rgba(201, 185, 163, .05) 0 1px, transparent 1px 68px);
}
.header-main__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding-block: 16px;
}
.brand {
  display: inline-grid;
  gap: 2px;
  color: var(--paper);
}
.brand__mark {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.06;
  transition: color .18s var(--ease);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .24em;
  color: var(--cyan);
}
.brand:hover .brand__mark { color: var(--cyan); }

.header-hint {
  margin: 0;
  max-width: 220px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .14em;
  line-height: 1.6;
  color: var(--slate);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: rgba(18, 42, 64, .6);
  color: var(--sand);
  cursor: pointer;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.nav-toggle:hover { color: var(--cyan); border-color: var(--line-cyan); }
.nav-toggle__bars { display: grid; gap: 3px; width: 16px; }
.nav-toggle__bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform .18s var(--ease), opacity .18s var(--ease);
}
.nav-toggle[aria-expanded="true"] { color: var(--cyan); border-color: var(--line-cyan); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle__text { font-family: var(--font-mono); font-size: 11px; letter-spacing: .18em; }

.nav {
  background: rgba(11, 29, 46, .96);
  border-bottom: 1px solid var(--line-cyan);
}
.nav__inner { display: flex; }
.nav__list { display: flex; align-items: stretch; gap: clamp(8px, 2vw, 32px); width: 100%; }
.nav__item { display: flex; }
.nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: .55em;
  padding: 14px 2px;
  font-size: 14.5px;
  line-height: 1.4;
  color: var(--sand);
  transition: color .18s var(--ease), background-color .18s var(--ease);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .18s var(--ease);
}
.nav__link:hover { color: var(--paper); }
.nav__link:hover::after { transform: scaleX(1); }
.nav__link[aria-current="page"] { color: var(--cyan); }
.nav__link[aria-current="page"]::after { transform: scaleX(1); }
.nav__link[aria-current="page"] .nav__num { color: var(--amber); }
.nav__num {
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: .16em;
  color: var(--slate);
  transition: color .18s var(--ease);
}
.nav__label { white-space: nowrap; }

/* 第 2 项：品牌自述，作视觉强化 */
.nav__link--key {
  padding-inline: 12px;
  color: var(--amber);
  background: linear-gradient(90deg, rgba(242, 163, 60, .16), rgba(242, 163, 60, 0) 92%);
}
.nav__link--key::after { background: var(--amber); }
.nav__link--key .nav__num { color: var(--amber); }
.nav__link--key .nav__label::before {
  content: "◆";
  margin-right: .45em;
  font-size: .58em;
  vertical-align: .18em;
  opacity: .85;
}
.nav__link--key:hover { color: #FFC978; }
.nav__link--key[aria-current="page"] { color: #FFC978; }

.site-header.is-stuck .nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 90;
  box-shadow: 0 1px 0 rgba(53, 224, 208, .25), 0 14px 34px rgba(0, 0, 0, .42);
}
.site-header.is-stuck .nav__link { padding-block: 11px; }
.nav-spacer { display: block; height: 0; }

.read-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 100;
  background: rgba(201, 185, 163, .12);
  pointer-events: none;
}
.read-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
}

/* ---------- 15. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 110px);
  background: var(--ink-700);
  border-top: 1px solid var(--line-cyan);
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, var(--amber), transparent 60%);
  opacity: .7;
}
.footer__inner {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(24px, 4vw, 64px);
  padding-block: clamp(34px, 5vw, 68px);
}
.footer__brand {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line);
  padding: clamp(20px, 3vw, 34px);
  clip-path: var(--cut);
}
.footer__brand::after {
  content: "";
  position: absolute;
  right: -20%;
  bottom: -40%;
  width: 62%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-cyan));
  transform: rotate(-24deg);
  pointer-events: none;
}
.footer__wordmark {
  color: var(--paper);
  font-size: clamp(24px, 3vw, 38px);
  font-weight: 800;
  letter-spacing: -.03em;
  line-height: 1.1;
}
.footer__tagline {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--cyan);
}
.footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 22px;
  margin-top: clamp(18px, 2.6vw, 28px);
}
.footer__link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--sand);
  border-bottom: 1px solid rgba(201, 185, 163, .32);
  padding-bottom: 2px;
  transition: color .18s var(--ease), border-color .18s var(--ease);
}
.footer__link:hover { color: var(--cyan); border-bottom-color: var(--line-cyan); }

.footer__contact {
  border-left: 1px solid var(--line);
  padding-left: clamp(16px, 2.4vw, 30px);
}
.footer__label {
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--amber);
  margin-bottom: 16px;
}
.footer__list { display: grid; gap: 12px; }
.footer__item { display: grid; gap: 2px; }
.footer__key {
  font-size: 10.5px;
  letter-spacing: .18em;
  color: var(--slate);
}
.footer__value { font-size: 14.5px; line-height: 1.6; color: var(--sand); }
.footer__note {
  margin-top: 18px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--slate);
  max-width: 40ch;
}
.footer__legal {
  border-top: 1px solid var(--line-soft);
  background: rgba(11, 29, 46, .72);
}
.footer__legal-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-block: 18px;
}
.footer__legal-text {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--slate);
}

/* ---------- 16. 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .28s var(--ease), transform .28s var(--ease);
}
[data-reveal].is-inview { opacity: 1; transform: none; }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1080px) {
  .header-hint { display: none; }
  .span-4, .span-5 { grid-column: span 6; }
}
@media (max-width: 900px) {
  .grid { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 6; }
  .rail { position: static; border-left: 0; border-top: 1px solid var(--line); padding-left: 0; padding-top: 12px; }
  .rail__list { grid-auto-flow: column; grid-auto-columns: max-content; overflow-x: auto; gap: 18px; padding-bottom: 4px; }
  .rail__link.is-active { padding-left: 0; }
  .rail__link::before { display: none; }
  .footer__inner { grid-template-columns: minmax(0, 1fr); }
  .footer__contact { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 24px; }
}
@media (max-width: 899px) {
  .nav { display: none; }
  .nav[data-open] { display: block; }
  .nav__inner { display: block; padding-block: 6px 14px; }
  .nav__list { flex-direction: column; gap: 0; }
  .nav__item { display: block; }
  .nav__link {
    display: flex;
    width: 100%;
    padding: 13px 2px;
    border-bottom: 1px solid var(--line-soft);
  }
  .nav__link::after { display: none; }
  .nav__link[aria-current="page"] { background: rgba(53, 224, 208, .07); }
  .nav__link--key {
    margin-top: 6px;
    padding-inline: 12px;
    border-bottom-color: var(--line-amber);
  }
  .nav-toggle { display: inline-flex; }
  .header-strip__version { display: none; }
  .read-progress { position: fixed; }
}
@media (max-width: 560px) {
  .header-strip__inner { gap: 10px; }
  .header-strip__note { font-size: 10px; letter-spacing: .12em; }
  .header-strip__cta { font-size: 11px; padding: .4em .7em; }
  .grid { gap: 12px; }
  .panel { padding: 18px; }
  .footer__legal-inner { justify-content: flex-start; }
}

/* ---------- 18. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  html { scroll-behavior: auto !important; }
  [data-reveal] { opacity: 1 !important; transform: none !important; }
}