/* ==========================================================================
   LEYU赛场 — /assets/site.css
   共享外壳：重置 / 变量 / 中文排版 / 页头 / 页脚 / 通用组件
   ========================================================================== */

/* ---------- 1. 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 88px;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

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

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

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

a { color: inherit; }

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

[hidden] { display: none !important; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  /* 珠宝色分区 */
  --deep-green: #0C2421;
  --night-ink: #10171A;
  --track-red: #E23A3A;
  --ref-yellow: #F2C230;
  --cement: #B9C0C4;
  --paper: #F4F1EA;
  --celadon: #2FA98C;
  --indigo: #1E3A5F;
  --wine: #7C2230;
  --sand: #E6E2D8;

  /* 语义令牌 */
  --line-soft: rgba(185, 192, 196, 0.22);
  --line-strong: rgba(185, 192, 196, 0.44);
  --ink-soft: #5C6669;
  --ink-faint: #7E888C;

  /* 字体 */
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system,
    "Segoe UI", Roboto, sans-serif;
  --font-cond: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo,
    Consolas, "Source Han Mono SC", "Courier New", monospace;

  /* 尺寸与节奏 */
  --header-h: 72px;
  --wrap: 1240px;
  --radius: 3px;
  --radius-lg: 6px;
  --d-fast: 0.2s;
  --d-mid: 0.32s;
}

@media (max-width: 980px) {
  :root { --header-h: 64px; }
}

/* ---------- 3. 中文排版 ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--night-ink);
  background-color: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

@media (max-width: 760px) {
  body { font-size: 15px; }
}

h1, h2, h3, h4 {
  font-family: var(--font-cond);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.012em;
  overflow-wrap: break-word;
}

h1 { font-size: clamp(30px, 5vw, 40px); }
h2 { font-size: clamp(26px, 3.6vw, 32px); }
h3 { font-size: clamp(20px, 2.4vw, 24px); }
h4 { font-size: 18px; }

.mono,
time,
.stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.muted { color: var(--ink-soft); }

.section[data-tone="deep"] .muted,
.section[data-tone="indigo"] .muted,
.section[data-tone="wine"] .muted,
.section[data-tone="ink"] .muted { color: var(--cement); }

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

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

/* ---------- 4. 布局容器 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(20px, 4vw, 40px);
}

.wrap--narrow { max-width: 880px; }
.wrap--text { max-width: 720px; }

#main-content { padding-top: var(--header-h); }

.section { padding-block: clamp(64px, 9vw, 140px); }
.section--tight { padding-block: clamp(40px, 5vw, 72px); }

.section[data-tone="deep"] { background-color: var(--deep-green); color: var(--paper); }
.section[data-tone="ink"] { background-color: var(--night-ink); color: var(--paper); }
.section[data-tone="paper"] { background-color: var(--paper); color: var(--night-ink); }
.section[data-tone="sand"] { background-color: var(--sand); color: var(--night-ink); }
.section[data-tone="indigo"] { background-color: var(--indigo); color: var(--paper); }
.section[data-tone="wine"] { background-color: var(--wine); color: var(--paper); }

.grid {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 960px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 20px;
  background-color: var(--paper);
  color: var(--night-ink);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  border-radius: 0 0 var(--radius) var(--radius);
  transition: top var(--d-fast) ease;
}

.skip-link:focus {
  top: 0;
}

/* ---------- 6. 页头 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 80;
  color: var(--paper);
  background-color: transparent;
  transition: background-color var(--d-mid) ease, box-shadow var(--d-mid) ease;
}

.site-header[data-pinned="true"] {
  background-color: rgba(12, 36, 33, 0.95);
  box-shadow:
    0 1px 0 rgba(185, 192, 196, 0.16),
    0 24px 48px -34px rgba(0, 0, 0, 0.9);
}

@supports (backdrop-filter: blur(1px)) {
  .site-header[data-pinned="true"] {
    backdrop-filter: blur(12px) saturate(1.2);
  }
}

body:has(.site-nav[data-open="true"]) .site-header {
  background-color: var(--deep-green);
}

.header-rail {
  max-width: var(--wrap);
  margin-inline: auto;
  min-height: var(--header-h);
  padding: 10px clamp(20px, 4vw, 40px);
  display: flex;
  align-items: center;
  gap: clamp(16px, 2.6vw, 34px);
}

/* 品牌 · 换人牌记号 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex: none;
  color: inherit;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex: none;
  background-color: var(--track-red);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 86% 100%, 0 100%);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-cond);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: 0.07em;
}

.brand__note {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cement);
}

/* 主导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-left: auto;
  flex: 1 1 auto;
  justify-content: flex-end;
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.site-nav__list a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-decoration: none;
  transition: background-color var(--d-fast) ease,
    border-color var(--d-fast) ease, color var(--d-fast) ease;
}

.site-nav__list a:hover,
.site-nav__list a:focus-visible {
  border-color: var(--track-red);
  background-color: rgba(226, 58, 58, 0.18);
}

.site-nav__list a[aria-current="page"] {
  background-color: var(--track-red);
  border-color: var(--track-red);
  color: #fff;
}

.site-nav__utility {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-left: 16px;
  border-left: 1px solid var(--line-soft);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 9px 14px;
  background-color: rgba(12, 36, 33, 0.6);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--paper);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: background-color var(--d-fast) ease,
    border-color var(--d-fast) ease;
}

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

.nav-toggle__bars i {
  display: block;
  height: 2px;
  border-radius: 1px;
  background-color: var(--track-red);
  transition: background-color var(--d-fast) ease;
}

.nav-toggle[aria-expanded="true"] {
  background-color: var(--track-red);
  border-color: var(--track-red);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i {
  background-color: #fff;
}

/* 阅读进度 */
.read-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background-color: rgba(185, 192, 196, 0.14);
  overflow: hidden;
}

.read-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--track-red), var(--wine));
}

/* 移动抽屉遮罩 */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 78;
  background-color: rgba(8, 20, 18, 0.62);
  animation: scrim-in 0.24s ease both;
}

@keyframes scrim-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (min-width: 981px) {
  .nav-scrim { display: none; }
}

/* 中窄桌面：压缩牌面尺寸 */
@media (max-width: 1180px) and (min-width: 981px) {
  .site-nav__list a {
    padding: 7px 10px;
    font-size: 13px;
    letter-spacing: 0.02em;
  }
  .site-nav__utility { padding-left: 10px; }
  .site-nav__utility .chip { padding: 6px 9px; font-size: 11px; }
  .brand__note { display: none; }
}

/* ---------- 7. 页脚 ---------- */
.site-footer {
  position: relative;
  background-color: var(--night-ink);
  color: var(--cement);
  padding-top: clamp(56px, 7vw, 88px);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--track-red) 0 26%,
    var(--wine) 26% 56%,
    var(--indigo) 56% 100%
  );
}

.footer-grid {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 0 clamp(20px, 4vw, 40px) clamp(48px, 6vw, 72px);
  display: grid;
  gap: clamp(32px, 4vw, 48px);
  grid-template-columns:
    minmax(210px, 1.5fr)
    repeat(3, minmax(120px, 1fr))
    minmax(210px, 1.35fr);
}

@media (max-width: 1080px) {
  .footer-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 640px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  background-color: var(--track-red);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  clip-path: polygon(0 0, 100% 0, 100% 74%, 86% 100%, 0 100%);
}

.footer-brand__title {
  font-family: var(--font-cond);
  font-size: 22px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.footer-brand__note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cement);
}

.footer-brand__closing {
  max-width: 34ch;
  margin-top: 4px;
  padding-left: 14px;
  border-left: 2px solid var(--track-red);
  font-size: 14px;
  line-height: 1.7;
  color: #8E979B;
}

.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--paper);
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid rgba(185, 192, 196, 0.18);
}

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

.footer-col__list a {
  position: relative;
  display: inline-block;
  padding: 7px 0 7px 16px;
  font-size: 14px;
  color: var(--cement);
  text-decoration: none;
  transition: color var(--d-fast) ease;
}

.footer-col__list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 1px;
  background-color: var(--cement);
  transform: translateY(-50%);
  transition: width var(--d-fast) ease, background-color var(--d-fast) ease;
}

.footer-col__list a:hover,
.footer-col__list a:focus-visible {
  color: var(--paper);
}

.footer-col__list a:hover::before,
.footer-col__list a:focus-visible::before {
  width: 11px;
  background-color: var(--track-red);
}

.footer-contact {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.footer-contact__value {
  font-size: 14px;
  color: var(--paper);
  word-break: break-word;
}

.footer-contact__note {
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px dashed rgba(185, 192, 196, 0.18);
  font-size: 12px;
  line-height: 1.65;
  color: var(--ink-faint);
}

.footer-base {
  border-top: 1px solid rgba(185, 192, 196, 0.16);
  background-color: rgba(0, 0, 0, 0.28);
}

.footer-base__inner {
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 20px clamp(20px, 4vw, 40px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
}

.footer-base__legal { color: var(--cement); }

/* ---------- 8. 通用文本组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--track-red);
}

.eyebrow::before {
  content: "";
  flex: none;
  width: 22px;
  height: 2px;
  background-color: currentColor;
}

.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.75;
}

.prose > * + * { margin-top: 1.15em; }
.prose h2 { margin-top: 2em; }
.prose h3 { margin-top: 1.6em; }

.prose ul,
.prose ol {
  padding-left: 1.4em;
  list-style: revert;
}

.prose li + li { margin-top: 0.4em; }

.prose a {
  color: var(--track-red);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.rule {
  height: 1px;
  border: 0;
  margin: 0;
  background-color: var(--line-soft);
}

/* ---------- 9. 卡片 / 数据 / 行动 ---------- */
.panel {
  position: relative;
  padding: clamp(20px, 3vw, 32px);
  background-color: var(--paper);
  border: 1px solid var(--sand);
  border-radius: var(--radius);
}

.panel__head { margin-bottom: 16px; }
.panel__body { font-size: 15px; line-height: 1.75; }

.section[data-tone="deep"] .panel,
.section[data-tone="indigo"] .panel,
.section[data-tone="wine"] .panel,
.section[data-tone="ink"] .panel {
  background-color: rgba(255, 255, 255, 0.045);
  border-color: var(--line-soft);
  color: var(--paper);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.stat__num {
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--track-red);
}

.stat__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-soft);
}

.section[data-tone="deep"] .stat__label,
.section[data-tone="indigo"] .stat__label,
.section[data-tone="wine"] .stat__label,
.section[data-tone="ink"] .stat__label { color: var(--cement); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 46px;
  padding: 12px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  cursor: pointer;
  transition: background-color var(--d-fast) ease,
    border-color var(--d-fast) ease, color var(--d-fast) ease,
    transform var(--d-fast) ease;
}

.btn:active { transform: translateY(1px); }

.btn--solid {
  background-color: var(--track-red);
  border-color: var(--track-red);
  color: #fff;
}

.btn--solid:hover {
  background-color: #C42E2E;
  border-color: #C42E2E;
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--line-strong);
  color: inherit;
}

.btn--ghost:hover {
  border-color: var(--track-red);
  color: var(--track-red);
}

.btn--ink {
  background-color: var(--night-ink);
  border-color: var(--night-ink);
  color: var(--paper);
}

.btn--ink:hover { background-color: var(--deep-green); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 34px;
  padding: 6px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  white-space: nowrap;
  text-decoration: none;
  transition: background-color var(--d-fast) ease,
    border-color var(--d-fast) ease, color var(--d-fast) ease;
}

.chip--ghost { color: var(--paper); }

.chip--ghost:hover {
  border-color: var(--track-red);
  background-color: rgba(226, 58, 58, 0.2);
  color: #fff;
}

.chip--solid {
  background-color: var(--paper);
  border-color: var(--paper);
  color: var(--night-ink);
}

.chip--solid:hover { background-color: #fff; }

.chip--warn {
  border-color: var(--ref-yellow);
  background-color: rgba(242, 194, 48, 0.12);
  color: var(--ref-yellow);
}

.chip--ok {
  border-color: var(--celadon);
  color: var(--celadon);
}

.chip--alert {
  border-color: var(--track-red);
  color: var(--track-red);
}

/* ---------- 10. 面包屑 ---------- */
.breadcrumb {
  padding-block: 14px;
  font-size: 13px;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  opacity: 0.72;
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  opacity: 0.5;
}

.breadcrumb__item a {
  text-decoration: none;
}

.breadcrumb__item a:hover {
  color: var(--track-red);
  opacity: 1;
}

.breadcrumb__item[aria-current="page"] { opacity: 1; }

/* ---------- 11. 轨道语言 ---------- */
.rail {
  position: relative;
  padding-left: 30px;
}

.rail::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--track-red),
    var(--indigo),
    rgba(185, 192, 196, 0)
  );
}

.rail__node { position: relative; }

.rail__node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 8px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--paper);
  border: 2px solid var(--cement);
  box-shadow: 0 0 0 4px rgba(185, 192, 196, 0.14);
}

.rail__node[data-state="active"]::before {
  background-color: var(--track-red);
  border-color: var(--track-red);
  box-shadow: 0 0 0 4px rgba(226, 58, 58, 0.22);
}

.rail__node[data-state="warn"]::before {
  background-color: var(--ref-yellow);
  border-color: var(--ref-yellow);
  box-shadow: 0 0 0 4px rgba(242, 194, 48, 0.2);
}

.rail__node[data-state="done"]::before {
  background-color: var(--celadon);
  border-color: var(--celadon);
  box-shadow: 0 0 0 4px rgba(47, 169, 140, 0.2);
}

.track-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: transparent;
  border: 2px solid var(--line-strong);
  transition: background-color 0.24s ease, border-color 0.24s ease,
    box-shadow 0.24s ease;
}

.track-dot.is-lit {
  background-color: var(--track-red);
  border-color: var(--track-red);
  box-shadow: 0 0 0 5px rgba(226, 58, 58, 0.18);
}

.pulse {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--celadon);
  box-shadow: 0 0 0 0 rgba(47, 169, 140, 0.5);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(47, 169, 140, 0.5); }
  50% { box-shadow: 0 0 0 8px rgba(47, 169, 140, 0); }
}

/* ---------- 12. 图片容器 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius);
  background-color: var(--deep-green);
  background-image: linear-gradient(
    135deg,
    var(--deep-green) 0%,
    var(--indigo) 56%,
    var(--wine) 100%
  );
}

.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--paper);
  background: linear-gradient(
    180deg,
    rgba(16, 23, 26, 0) 0%,
    rgba(16, 23, 26, 0.86) 100%
  );
}

.media::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 1px solid rgba(185, 192, 196, 0.2);
  border-radius: inherit;
  pointer-events: none;
}

/* ---------- 13. 显现 ---------- */
.reveal {
  opacity: 0;
  transform: translate3d(0, 12px, 0);
  transition: opacity var(--d-mid) ease, transform var(--d-mid) ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 14. 移动端导航抽屉 ---------- */
@media (max-width: 980px) {
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 95;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    margin: 0;
    max-height: 82vh;
    overflow-y: auto;
    padding: 20px clamp(16px, 5vw, 28px)
      calc(24px + env(safe-area-inset-bottom, 0px));
    background-color: var(--deep-green);
    border-top: 2px solid var(--track-red);
    box-shadow: 0 -30px 60px -30px rgba(0, 0, 0, 0.85);
    transform: translateY(105%);
    visibility: hidden;
    transition: transform 0.3s ease, visibility 0.3s ease;
  }

  .site-nav[data-open="true"] {
    transform: translateY(0);
    visibility: visible;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 6px;
  }

  .site-nav__list a {
    justify-content: flex-start;
    min-height: 48px;
    padding: 10px 14px;
    font-size: 16px;
    border-color: var(--line-soft);
    background-color: rgba(255, 255, 255, 0.03);
  }

  .site-nav__list a[aria-current="page"] {
    background-color: var(--track-red);
    border-color: var(--track-red);
  }

  .site-nav__utility {
    flex-direction: column;
    align-items: stretch;
    margin-top: 16px;
    padding: 16px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line-soft);
  }

  .site-nav__utility .chip {
    justify-content: center;
    min-height: 44px;
    font-size: 13px;
  }
}

/* ---------- 15. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .pulse {
    animation: none;
    box-shadow: none;
  }

  .site-nav {
    transition: none;
  }
}