/* ============================================================
   版本指南 · site.css
   共享外壳与基础组件：档案终端语言
   切角面板 / 等宽编号 / 三态色（橙·青·琥珀）
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 112px;
}

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

ul, ol { padding: 0; }

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

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

table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* ---------- 2. 变量 ---------- */
:root {
  /* 墨蓝层 */
  --ink-900: #0B1B2B;
  --ink-800: #12293F;
  --ink-700: #1E3A52;
  /* 纸面层 */
  --paper: #F4F1EA;
  --warm-200: #E4DFD4;
  /* 锚点色 */
  --orange: #FF6A2B;
  --orange-soft: #FF8248;
  --cyan: #37E6D6;
  --amber: #FFC24B;
  /* 文字层 */
  --cool-400: #B9C4CE;
  --slate-600: #5A6B78;
  --dim: #7C8FA0;

  /* 字体 */
  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;

  /* 结构 */
  --shell-max: 1440px;
  --gutter: clamp(1rem, 4vw, 3.5rem);
  --cut: 12px;
  --hair: rgba(244, 241, 234, 0.12);
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --tex-diag: repeating-linear-gradient(112deg, rgba(244, 241, 234, 0.035) 0 1px, transparent 1px 10px);
}

/* ---------- 3. 中文排版基础 ---------- */
body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--ink-900);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

p {
  line-height: 1.75;
  max-width: 36em;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.05;
}

a { color: inherit; }

strong { font-weight: 700; }

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

/* ---------- 4. 焦点可见 ---------- */
:where(a, button, summary, input, [tabindex]):focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- 5. 工具类 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: clamp(2.75rem, 6vw, 6rem);
}

.display {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.6rem, 9vw, 7.5rem);
  letter-spacing: -0.02em;
  line-height: 0.94;
  margin: 0;
}

.display--md {
  font-size: clamp(1.9rem, 5vw, 3.6rem);
  line-height: 1.02;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--cool-400);
  margin: 0;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--orange);
  flex: none;
}

.idx {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--orange);
  font-weight: 500;
}

.idx--lg {
  display: block;
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1;
}

.mono {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  font-size: 0.92em;
}

.muted {
  color: var(--cool-400);
}

.on-paper {
  background-color: var(--paper);
  color: var(--ink-900);
}

.on-paper .muted { color: var(--slate-600); }

/* 网格 */
.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.75rem);
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--cool-400);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.breadcrumb li + li::before {
  content: "/";
  color: var(--dim);
  margin-right: 0.5rem;
}

.breadcrumb a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.breadcrumb a:hover {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

.on-paper .breadcrumb a:hover {
  color: var(--ink-900);
  border-bottom-color: var(--orange);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.78rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  line-height: 1.2;
  text-decoration: none;
  color: var(--paper);
  background-color: transparent;
  border: 1px solid rgba(244, 241, 234, 0.28);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
              background-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.btn:hover {
  color: var(--orange);
  border-color: var(--orange);
  transform: translateX(-2px);
}

.btn--solid {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
  font-weight: 600;
}

.btn--solid:hover {
  background-color: var(--orange-soft);
  border-color: var(--orange-soft);
  color: var(--ink-900);
}

.btn--on-light {
  color: var(--ink-900);
  border-color: rgba(11, 27, 43, 0.25);
}

.btn--on-light:hover {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 8. 切角面板 ---------- */
.cut {
  clip-path: polygon(
    0 0,
    calc(100% - var(--cut)) 0,
    100% var(--cut),
    100% 100%,
    var(--cut) 100%,
    0 calc(100% - var(--cut))
  );
}

.panel {
  background-color: var(--ink-700);
  color: var(--paper);
  padding: clamp(1.1rem, 2.4vw, 1.8rem);
  border: 1px solid var(--hair);
  position: relative;
}

.panel--ink {
  background-color: var(--ink-800);
}

/* ---------- 9. 状态标签与圆点 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.18rem 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.12em;
  line-height: 1.6;
  border: 1px solid currentColor;
}

.tag--live { color: var(--cyan); }
.tag--wait { color: var(--amber); }
.tag--hold { color: var(--orange); }

.state-dot {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--dim);
  flex: none;
}

.state-dot--live {
  background-color: var(--cyan);
  animation: dot-breathe 2.4s ease-in-out infinite;
}

@keyframes dot-breathe {
  0%, 100% { box-shadow: 0 0 0 0 rgba(55, 230, 214, 0.45); opacity: 1; }
  50% { box-shadow: 0 0 0 5px rgba(55, 230, 214, 0); opacity: 0.62; }
}

/* ---------- 10. 对照表 ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--hair);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  width: 100%;
  min-width: 640px;
  font-size: 0.92rem;
}

.data-table th,
.data-table td {
  padding: 0.75rem 0.9rem;
  text-align: left;
  border-bottom: 1px solid var(--hair);
  vertical-align: top;
}

.data-table thead th {
  background-color: var(--ink-700);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  font-weight: 500;
  color: var(--cool-400);
}

.data-table tbody tr:nth-child(even) {
  background-color: rgba(228, 223, 212, 0.04);
}

.data-table tbody th {
  position: sticky;
  left: 0;
  background-color: var(--ink-800);
  font-weight: 600;
  z-index: 1;
}

.on-paper .table-wrap { border-color: rgba(11, 27, 43, 0.14); }
.on-paper .data-table th,
.on-paper .data-table td { border-bottom-color: rgba(11, 27, 43, 0.12); }
.on-paper .data-table thead th { background-color: var(--warm-200); color: var(--slate-600); }
.on-paper .data-table tbody th { background-color: var(--warm-200); }

/* ---------- 11. 三态筛选 chip ---------- */
.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
}

.chip input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.chip span {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--cool-400);
  border: 1px solid var(--hair);
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
              background-color 0.18s var(--ease);
}

.chip span:hover {
  color: var(--paper);
  border-color: var(--orange);
}

.chip input:checked + span {
  color: var(--ink-900);
  background-color: var(--cyan);
  border-color: var(--cyan);
}

.chip input:focus-visible + span {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

/* ---------- 12. 折叠问答 ---------- */
.accordion {
  border-top: 1px solid var(--hair);
}

.accordion > details {
  border-bottom: 1px solid var(--hair);
  padding-left: 0;
  transition: padding-left 0.2s var(--ease), border-color 0.2s var(--ease);
}

.accordion > details[open] {
  border-left: 3px solid var(--orange);
  padding-left: 1rem;
}

.accordion summary {
  cursor: pointer;
  padding: 1rem 0;
  font-weight: 600;
  list-style: none;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}

.accordion summary::-webkit-details-marker { display: none; }

.accordion summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  color: var(--orange);
}

.accordion details[open] summary::after { content: "−"; }

.accordion .accordion__body {
  padding-bottom: 1.15rem;
  color: var(--cool-400);
  font-size: 0.95rem;
}

.on-paper .accordion,
.on-paper .accordion > details { border-color: rgba(11, 27, 43, 0.14); }
.on-paper .accordion .accordion__body { color: var(--slate-600); }

/* ---------- 13. 媒体容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--ink-700);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(244, 241, 234, 0.05) 0 1px,
    transparent 1px 9px
  );
  border: 1px solid var(--hair);
}

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

.media--wide { aspect-ratio: 21 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--portrait { aspect-ratio: 4 / 5; }

.media--paper {
  background-color: var(--warm-200);
  background-image: repeating-linear-gradient(
    135deg,
    rgba(11, 27, 43, 0.06) 0 1px,
    transparent 1px 9px
  );
  border-color: rgba(11, 27, 43, 0.14);
}

.media-figure { margin: 0; }

.media__caption {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  color: var(--slate-600);
}

/* ---------- 14. 显现动画 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .js [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
  }

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

/* ---------- 15. Skip link ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 1rem;
  z-index: 200;
  padding: 0.7rem 1.1rem;
  background-color: var(--orange);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: top 0.18s var(--ease);
}

.skip-link:focus {
  top: 0.75rem;
}

/* ============================================================
   16. 页头
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background-color: var(--ink-900);
  color: var(--paper);
  border-bottom: 1px solid var(--hair);
}

.site-header__bar {
  position: relative;
  background-color: var(--ink-900);
  background-image: var(--tex-diag);
}

.site-header__inner {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: clamp(1rem, 3vw, 3rem);
  min-height: 76px;
}

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding-block: 0.85rem;
  text-decoration: none;
  color: var(--paper);
  flex: none;
}

.brand__mark {
  width: 10px;
  height: 36px;
  flex: none;
  background-color: var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 0 100%);
  transition: transform 0.2s var(--ease);
}

.brand:hover .brand__mark {
  transform: translateY(-2px);
}

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.28rem, 2.4vw, 1.72rem);
  letter-spacing: 0.08em;
  line-height: 1;
}

.brand__meta {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  line-height: 1.4;
  color: var(--dim);
}

/* 主导航 */
.nav {
  display: flex;
  align-items: stretch;
}

.nav__list {
  display: flex;
  align-items: stretch;
  gap: clamp(0.2rem, 1vw, 1.2rem);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__item { display: flex; }

.nav__link {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.12rem;
  padding: 0.85rem 0.35rem;
  font-size: 0.88rem;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--cool-400);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
              transform 0.18s var(--ease);
}

.nav__idx {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  color: var(--dim);
  transition: color 0.18s var(--ease);
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
  transform: translateX(-2px);
}

.nav__link:hover .nav__idx,
.nav__link:focus-visible .nav__idx {
  color: var(--orange);
}

.nav__link[aria-current="page"] {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

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

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.6rem;
  align-self: center;
  padding: 0.6rem 0.8rem;
  background-color: transparent;
  border: 1px solid rgba(244, 241, 234, 0.22);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

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

.nav-toggle__bars {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
  width: 16px;
  height: 12px;
}

.nav-toggle__bars i {
  display: block;
  height: 1.5px;
  background-color: currentColor;
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) {
  transform: translateY(4.5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) {
  transform: translateY(-4.5px) rotate(-45deg);
}

/* 状态条 */
.status-strip {
  background-color: var(--ink-800);
  border-top: 1px solid rgba(244, 241, 234, 0.07);
}

.status-strip__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 28px;
  padding-block: 0.15rem;
}

.status-strip__text {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--cool-400);
  margin: 0;
  max-width: 100%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-strip__key { color: var(--orange); }

.status-strip__sep {
  color: var(--ink-700);
  padding-inline: 0.35rem;
}

.status-strip__dot {
  width: 7px;
  height: 7px;
  flex: none;
  border-radius: 50%;
  background-color: var(--cyan);
  animation: dot-breathe 2.4s ease-in-out infinite;
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background-image: linear-gradient(90deg, var(--orange), var(--cyan));
  will-change: transform;
}

/* ============================================================
   17. 页脚
   ============================================================ */
.site-footer {
  position: relative;
  background-color: var(--ink-800);
  background-image: var(--tex-diag);
  color: var(--cool-400);
  border-top: 1px solid var(--hair);
  padding-top: clamp(2.5rem, 5vw, 4.5rem);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.6fr;
  gap: clamp(1.5rem, 3vw, 3.25rem);
}

.site-footer__col { min-width: 0; }

.site-footer__col--brand {
  border-left: 2px solid var(--orange);
  padding-left: clamp(0.9rem, 1.6vw, 1.4rem);
}

.site-footer__brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3vw, 2.1rem);
  letter-spacing: 0.1em;
  line-height: 1;
  color: var(--paper);
  margin: 0 0 0.7rem;
  max-width: none;
}

.site-footer__line {
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--cool-400);
  margin: 0 0 1.1rem;
  max-width: 20ch;
}

.site-footer__sig {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  color: var(--dim);
  margin: 0;
  max-width: none;
}

.site-footer__sig-key {
  color: var(--orange);
  margin-right: 0.4rem;
}

.site-footer__title {
  display: flex;
  align-items: baseline;
  gap: 0.55rem;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  line-height: 1.4;
  color: var(--warm-200);
  margin: 0 0 1.05rem;
}

.site-footer__title .idx {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
}

.footer-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.footer-list a {
  display: inline-block;
  padding-block: 0.1rem;
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--cool-400);
  text-decoration: none;
  border-left: 2px solid transparent;
  padding-left: 0;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease),
              padding-left 0.18s var(--ease);
}

.footer-list a:hover,
.footer-list a:focus-visible {
  color: var(--paper);
  border-left-color: var(--orange);
  padding-left: 0.5rem;
}

.footer-contact {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--cool-400);
  word-break: break-word;
}

.footer-contact__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.18em;
  color: var(--dim);
  margin-bottom: 0.1rem;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.35rem;
  padding: 0.22rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.14em;
  background-color: transparent;
  color: var(--cool-400);
  border: 1px solid rgba(244, 241, 234, 0.22);
  cursor: pointer;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease),
              border-color 0.18s var(--ease);
}

.copy-btn:hover {
  color: var(--ink-900);
  background-color: var(--cyan);
  border-color: var(--cyan);
}

.copy-btn.is-copied {
  color: var(--ink-900);
  background-color: var(--cyan);
  border-color: var(--cyan);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.6rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-block: 1.15rem 1.5rem;
  border-top: 1px solid rgba(244, 241, 234, 0.09);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  line-height: 1.8;
  color: var(--dim);
}

.site-footer__legal p { margin: 0; max-width: none; }

.site-footer__legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer__legal-links a {
  color: var(--dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.site-footer__legal-links a:hover,
.site-footer__legal-links a:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--orange);
}

/* ============================================================
   18. 响应式
   ============================================================ */

/* 平板横屏 / 窄桌面 */
@media (max-width: 1180px) {
  .nav__link { font-size: 0.82rem; }
  .nav__list { gap: 0.15rem; }
}

/* 平板竖屏：导航折叠为底部抽拉面板 */
@media (max-width: 900px) {
  .site-header__inner { min-height: 68px; }

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

  .nav {
    position: fixed;
    inset: auto 0 0 0;
    z-index: 90;
    display: block;
    max-height: 78vh;
    overflow-y: auto;
    background-color: var(--ink-800);
    background-image: var(--tex-diag);
    border-top: 2px solid var(--orange);
    box-shadow: 0 -18px 40px rgba(4, 12, 20, 0.55);
    transform: translateY(101%);
    visibility: hidden;
    transition: transform 0.32s var(--ease), visibility 0.32s var(--ease);
    padding-bottom: calc(1.25rem + env(safe-area-inset-bottom));
  }

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

  .nav__list {
    flex-direction: column;
    gap: 0;
    padding: 0.35rem 0 0.5rem;
  }

  .nav__item { display: block; }

  .nav__link {
    flex-direction: row;
    align-items: baseline;
    justify-content: flex-start;
    gap: 0.9rem;
    padding: 1rem var(--gutter);
    font-size: 1.02rem;
    border-bottom: 1px solid rgba(244, 241, 234, 0.08);
    border-left: 2px solid transparent;
    border-bottom-width: 1px;
  }

  .nav__link:hover,
  .nav__link:focus-visible {
    transform: none;
    border-left-color: var(--orange);
    border-bottom-color: rgba(244, 241, 234, 0.08);
  }

  .nav__link[aria-current="page"] {
    border-left-color: var(--orange);
    border-bottom-color: rgba(244, 241, 234, 0.08);
  }

  .nav__idx { font-size: 0.62rem; }

  html.nav-open { overflow: hidden; }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

  .site-footer__grid { grid-template-columns: 1fr 1fr; }

  .site-footer__col--brand { grid-column: 1 / -1; }
}

/* 手机 */
@media (max-width: 620px) {
  html { scroll-padding-top: 96px; }

  .site-header__inner { min-height: 62px; }

  .brand__mark { height: 30px; }

  .brand__meta { font-size: 0.56rem; letter-spacing: 0.12em; }

  .status-strip__text {
    font-size: 0.6rem;
    letter-spacing: 0.06em;
  }

  .site-footer__grid { grid-template-columns: 1fr; gap: 2rem; }

  .site-footer__legal {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .data-table { min-width: 540px; }

  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 380px) {
  .status-strip__text { font-size: 0.54rem; }
}

/* ============================================================
   19. 减少动效
   ============================================================ */
@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;
    scroll-behavior: auto !important;
  }

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

  .nav {
    transition: none;
  }

  .scroll-progress {
    transition: none;
  }
}