/* ==========================================================================
   开博的方式 — /assets/site.css
   共享外壳样式：reset / tokens / 排版 / 页头 / 页脚 / 通用组件
   ========================================================================== */

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

* { margin: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

img, svg, video, canvas { 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; }

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

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

:where(h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote) { margin: 0; }

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩 */
  --gobi: #14110F;
  --indigo: #1B2A4A;
  --indigo-deep: #0E1930;
  --orange: #C9622B;
  --orange-lt: #E58A4E;
  --green: #3E8E5A;
  --amber: #E0A93B;
  --slate: #7C8FA6;
  --limewhite: #F3EFE7;
  --ink: #101418;
  --fog: #A9B3BA;

  --line: rgba(124, 143, 166, 0.28);
  --line-strong: rgba(124, 143, 166, 0.52);
  --line-soft: rgba(124, 143, 166, 0.14);
  --surface: rgba(14, 25, 48, 0.62);
  --surface-2: linear-gradient(180deg, rgba(27, 42, 74, 0.62) 0%, rgba(14, 25, 48, 0.62) 100%);

  /* 字体 */
  --font-display: "Arial Narrow", "Helvetica Neue Condensed", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body: "Helvetica Neue", Helvetica, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", Arial, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  /* 字号阶梯 72 / 48 / 32 / 22 / 18 / 16 / 14 / 12 */
  --fs-72: clamp(40px, 6.4vw, 72px);
  --fs-48: clamp(30px, 4.2vw, 48px);
  --fs-32: clamp(24px, 2.8vw, 32px);
  --fs-22: 22px;
  --fs-18: 18px;
  --fs-16: 16px;
  --fs-14: 14px;
  --fs-12: 12px;
  --fs-label: 11px;

  /* 间距（8px 基线） */
  --s1: 8px;
  --s2: 16px;
  --s3: 24px;
  --s4: 32px;
  --s5: 48px;
  --s6: 64px;
  --s7: 96px;

  --wrap: 1240px;
  --radius: 2px;
  --header-h: 68px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. Base typography ---------- */
body {
  min-height: 100vh;
  background-color: var(--gobi);
  background-image:
    radial-gradient(120% 55% at 50% -12%, rgba(27, 42, 74, 0.9) 0%, rgba(20, 17, 15, 0) 62%),
    linear-gradient(180deg, rgba(14, 25, 48, 0.35) 0%, rgba(20, 17, 15, 0) 30%);
  background-repeat: no-repeat;
  color: var(--limewhite);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.005em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 800;
  font-stretch: condensed;
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--limewhite);
}

h1 { font-size: var(--fs-72); line-height: 1.02; }
h2 { font-size: var(--fs-48); }
h3 { font-size: var(--fs-32); }
h4 { font-size: var(--fs-22); }
h5 { font-size: var(--fs-18); }
h6 { font-size: var(--fs-16); }

p { color: rgba(243, 239, 231, 0.84); }

strong, b { font-weight: 700; color: var(--limewhite); }

small { font-size: var(--fs-12); }

a { text-decoration-thickness: 1px; text-underline-offset: 3px; }

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

[id] { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---------- 4. Layout ---------- */
.wrap {
  width: min(100% - 40px, var(--wrap));
  margin-inline: auto;
}

.wrap--narrow { width: min(100% - 40px, 880px); }

.section { padding-block: var(--s6); }

.section--tight { padding-block: var(--s5); }

.section__head {
  display: grid;
  gap: var(--s2);
  border-top: 1px solid var(--line);
  padding-top: var(--s3);
  margin-bottom: var(--s4);
}

.section__head > * { max-width: 74ch; }

.grid { display: grid; gap: var(--s3); }

.grid--2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

.grid--3 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

.grid--sidebar { grid-template-columns: minmax(0, 1fr); gap: var(--s4); }

@media (min-width: 1000px) {
  .grid--sidebar { grid-template-columns: minmax(0, 2.2fr) minmax(260px, 1fr); }
}

.stack {
  display: grid;
  gap: var(--s2);
}

.stack--tight { gap: var(--s1); }

/* ---------- 5. 文字与标注 ---------- */
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange-lt);
}

.eyebrow--muted { color: var(--slate); }

.coord {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--slate);
  font-variant-numeric: tabular-nums;
}

.coord--accent { color: var(--orange); }

.lead {
  font-size: var(--fs-22);
  line-height: 1.55;
  color: rgba(243, 239, 231, 0.9);
  max-width: 68ch;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.text-soft { color: var(--fog); }

.text-accent { color: var(--orange-lt); }

.text-up { color: var(--green); }

.text-key { color: var(--amber); }

.band {
  height: 6px;
  width: 100%;
  background: linear-gradient(90deg,
    #1B2A4A 0%,
    #243860 24%,
    #C9622B 52%,
    #E0A93B 70%,
    #3E8E5A 100%);
  opacity: 0.9;
}

.band--thin { height: 2px; }

/* ---------- 6. 数据组件 ---------- */
.data-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  border: 1px solid var(--line);
  background: var(--surface-2);
}

.data-strip__item {
  padding: var(--s3) var(--s3);
  border-left: 1px solid var(--line);
}

.data-strip__item:first-child { border-left: 0; }

@media (max-width: 640px) {
  .data-strip { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .data-strip__item { border-top: 1px solid var(--line); }
  .data-strip__item:nth-child(odd) { border-left: 0; }
  .data-strip__item:nth-child(-n+2) { border-top: 0; }
}

.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 600;
  line-height: 1;
  color: var(--limewhite);
  font-variant-numeric: tabular-nums;
}

.stat__value--accent { color: var(--orange-lt); }

.stat__value--up { color: var(--green); }

.stat__unit {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  font-weight: 500;
  color: var(--slate);
  margin-left: 4px;
}

.stat__label {
  display: block;
  margin-top: var(--s1);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: rgba(14, 25, 48, 0.45);
  -webkit-overflow-scrolling: touch;
}

.data-table {
  min-width: 560px;
  font-size: var(--fs-14);
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
  vertical-align: middle;
}

.data-table thead th {
  background: rgba(14, 25, 48, 0.85);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.data-table tbody tr { transition: background 0.16s var(--ease); }

.data-table tbody tr:hover { background: rgba(201, 98, 43, 0.12); }

.data-table tbody tr:last-child td { border-bottom: 0; }

.data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--limewhite);
}

.data-table caption {
  caption-side: top;
  text-align: left;
  padding: 12px 14px;
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
  border-bottom: 1px solid var(--line);
}

/* 轮次刻度骨架 */
.tick-rail {
  display: flex;
  align-items: flex-end;
  gap: 2px;
  height: 72px;
  border-bottom: 1px solid var(--line);
}

.tick-rail__item {
  flex: 1 1 0;
  min-width: 4px;
  height: var(--h, 40%);
  background: linear-gradient(180deg, rgba(124, 143, 166, 0.85), rgba(124, 143, 166, 0.08));
  transition: background 0.18s var(--ease);
}

.tick-rail__item:hover {
  background: linear-gradient(180deg, var(--orange-lt), rgba(201, 98, 43, 0.16));
}

.tick-rail__item--key { background: linear-gradient(180deg, var(--amber), rgba(224, 169, 59, 0.14)); }

.tick-rail__item--up { background: linear-gradient(180deg, var(--green), rgba(62, 142, 90, 0.14)); }

.tick-rail__label {
  display: block;
  margin-top: var(--s1);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  letter-spacing: 0.14em;
  color: var(--slate);
}

/* ---------- 7. 容器块 ---------- */
.panel {
  background: var(--surface-2);
  border: 1px solid var(--line);
  padding: var(--s3);
}

.panel--light {
  background: var(--limewhite);
  border-color: transparent;
  color: var(--ink);
}

.panel--light h2,
.panel--light h3,
.panel--light h4,
.panel--light p,
.panel--light strong { color: var(--ink); }

.panel--light .eyebrow { color: var(--orange); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--s3);
  background: rgba(14, 25, 48, 0.6);
  border: 1px solid var(--line);
  transition: border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.card:hover {
  border-color: var(--line-strong);
  background: rgba(27, 42, 74, 0.6);
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--fs-22);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.card__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--slate);
}

.card__text { font-size: var(--fs-16); color: var(--fog); }

.card--link a { text-decoration: none; }

.card--link a::after {
  content: "";
  position: absolute;
  inset: 0;
}

/* ---------- 8. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s1);
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: var(--fs-16);
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1.1;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}

.btn--accent {
  background: var(--orange);
  color: var(--ink);
}

.btn--accent:hover { background: var(--orange-lt); }

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

.btn--ghost:hover {
  border-color: var(--orange-lt);
  color: var(--orange-lt);
}

.btn--light {
  background: var(--limewhite);
  color: var(--ink);
}

.btn--light:hover { background: #fff; }

.btn--sm {
  padding: 9px 16px;
  font-size: var(--fs-14);
}

.btn--block { width: 100%; }

/* ---------- 9. 筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1);
  margin-bottom: var(--s3);
}

.filter-btn {
  appearance: none;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--fog);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

.filter-btn:hover {
  color: var(--limewhite);
  border-color: var(--orange-lt);
}

.filter-btn[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink);
}

.filter-item[hidden] { display: none; }

.filter-empty {
  padding: var(--s4) var(--s3);
  border: 1px dashed var(--line-strong);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.14em;
  color: var(--slate);
  text-align: center;
}

/* ---------- 10. 图片容器基础规则 ---------- */
.figure {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, #1B2A4A 0%, #0E1930 58%, #14110F 100%);
}

.figure__media {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.92) contrast(1.04);
}

.figure--wide .figure__media { aspect-ratio: 21 / 9; }

.figure--tall .figure__media { aspect-ratio: 3 / 4; }

.figure--square .figure__media { aspect-ratio: 1 / 1; }

.figure__cap {
  display: block;
  padding: 12px 14px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--slate);
}

.img-ph {
  width: 100%;
  aspect-ratio: 16 / 9;
  background-image:
    repeating-linear-gradient(135deg, rgba(124, 143, 166, 0.14) 0 1px, transparent 1px 14px),
    linear-gradient(160deg, #1B2A4A 0%, #0E1930 60%, #14110F 100%);
}

.img-ph--wide { aspect-ratio: 21 / 9; }

.img-ph--tall { aspect-ratio: 3 / 4; }

.img-ph--square { aspect-ratio: 1 / 1; }

/* ---------- 11. 面包屑与正文 ---------- */
.breadcrumbs {
  padding-block: var(--s3);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.1em;
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--slate);
}

.breadcrumbs li::after {
  content: "/";
  color: var(--line-strong);
}

.breadcrumbs li:last-child::after { content: none; }

.breadcrumbs a {
  color: var(--fog);
  text-decoration: none;
}

.breadcrumbs a:hover { color: var(--orange-lt); }

.breadcrumbs [aria-current="page"] { color: var(--limewhite); }

.prose {
  max-width: 72ch;
  font-size: var(--fs-18);
  line-height: 1.75;
}

.prose > * + * { margin-top: 1.05em; }

.prose h2 {
  font-size: var(--fs-32);
  margin-top: 1.7em;
}

.prose h3 {
  font-size: var(--fs-22);
  margin-top: 1.5em;
}

.prose p { color: rgba(243, 239, 231, 0.82); }

.prose ul,
.prose ol {
  list-style: disc;
  padding-left: 1.35em;
  color: rgba(243, 239, 231, 0.82);
}

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.5em; }

.prose a { color: var(--orange-lt); }

.prose a:hover { color: var(--amber); }

.prose--light,
.prose--light p,
.prose--light li,
.prose--light ul,
.prose--light ol { color: rgba(16, 20, 24, 0.82); }

.prose--light h2,
.prose--light h3 { color: var(--ink); }

.prose--light a { color: #A4491B; }

/* ---------- 12. 页头 ---------- */
.skip-link {
  position: fixed;
  left: var(--s2);
  top: -120px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--orange);
  color: var(--ink);
  font-weight: 700;
  font-size: var(--fs-14);
  text-decoration: none;
  border-radius: var(--radius);
  transition: top 0.2s var(--ease);
}

.skip-link:focus { top: var(--s2); }

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  z-index: 130;
  background: linear-gradient(90deg, var(--orange) 0%, var(--amber) 60%, var(--green) 100%);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  padding: 12px 0;
  background: linear-gradient(180deg, rgba(20, 17, 15, 0.94) 0%, rgba(20, 17, 15, 0.7) 62%, rgba(20, 17, 15, 0) 100%);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-header__inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--s2);
  width: min(100% - 32px, var(--wrap));
  margin-inline: auto;
  padding: 8px 10px 8px 16px;
  background: rgba(27, 42, 74, 0.88);
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  transition: padding 0.24s var(--ease), background 0.24s var(--ease), border-color 0.24s var(--ease);
}

.site-header[data-scrolled="true"] .site-header__inner {
  padding-block: 4px;
  background: rgba(14, 25, 48, 0.96);
  border-color: rgba(124, 143, 166, 0.66);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  min-width: 0;
  color: var(--limewhite);
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: 0 0 auto;
  background: var(--orange);
  color: var(--ink);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: var(--fs-14);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand__text {
  display: grid;
  min-width: 0;
  line-height: 1.1;
}

.brand__name {
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 800;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.brand__sub {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
  white-space: nowrap;
}

/* 导航 */
.site-nav { margin-inline: auto; }

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: block;
  padding: 9px 14px;
  border-radius: 999px;
  color: rgba(243, 239, 231, 0.78);
  font-size: var(--fs-14);
  font-weight: 500;
  line-height: 1.2;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s var(--ease), background 0.18s var(--ease);
}

.nav-link:hover {
  color: var(--limewhite);
  background: rgba(124, 143, 166, 0.18);
}

.nav-link[aria-current="page"] {
  background: var(--orange);
  color: var(--ink);
  font-weight: 700;
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: var(--s1);
  flex: 0 0 auto;
  margin-left: auto;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--s1);
  padding: 8px 12px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--limewhite);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}

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

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 1px;
  background: currentColor;
  transition: transform 0.18s var(--ease), opacity 0.18s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(4px) 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(-4px) rotate(-45deg); }

/* 平板 */
@media (max-width: 1080px) {
  .nav-link { padding: 9px 10px; font-size: var(--fs-12); letter-spacing: 0.02em; }
  .brand__sub { display: none; }
}

/* 手机与窄屏 */
@media (max-width: 920px) {
  .site-header { padding: 10px 0; }

  .site-header__inner {
    width: min(100% - 24px, var(--wrap));
    padding: 7px 10px 7px 12px;
    gap: var(--s1);
  }

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    margin: 0;
    padding: 10px;
    background: rgba(14, 25, 48, 0.98);
    border: 1px solid var(--line-strong);
    border-radius: 14px;
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    pointer-events: none;
    transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s var(--ease);
  }

  .site-nav[data-open="true"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-link {
    padding: 12px 14px;
    border-radius: 8px;
    font-size: var(--fs-16);
  }

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

  .header-cta { display: none; }
}

@media (max-width: 420px) {
  .brand__name { font-size: var(--fs-14); }
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  margin-top: var(--s7);
  background: var(--indigo-deep);
  border-top: 1px solid var(--line);
  color: var(--fog);
}

.site-footer .wrap { padding-top: var(--s6); }

.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--s4);
}

@media (min-width: 700px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .site-footer__grid { grid-template-columns: 1.5fr 1fr 1fr 1.3fr; gap: var(--s3); }
}

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--orange);
  color: var(--ink);
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: var(--fs-16);
  font-weight: 800;
}

.footer-brand__name {
  margin-top: var(--s2);
  font-family: var(--font-display);
  font-size: var(--fs-22);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--limewhite);
}

.footer-brand__line {
  margin-top: 6px;
  font-size: var(--fs-14);
  color: var(--fog);
}

.footer-brand__note {
  margin-top: var(--s1);
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--slate);
  max-width: 34ch;
}

.footer-col__title {
  margin-bottom: var(--s2);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-label);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate);
}

.footer-list {
  display: grid;
  gap: 9px;
  font-size: var(--fs-14);
  line-height: 1.6;
}

.footer-list a {
  color: rgba(243, 239, 231, 0.86);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.footer-list a:hover { color: var(--orange-lt); }

.footer-list--meta { color: var(--fog); }

.footer-list--meta .mono {
  color: var(--limewhite);
  font-size: var(--fs-14);
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px var(--s3);
  margin-top: var(--s5);
  padding: var(--s3) 0 var(--s4);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--slate);
}

.footer-note { margin: 0; color: var(--slate); }

/* ---------- 14. 动效与可访问性 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.24s var(--ease), transform 0.24s var(--ease);
}

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

:focus-visible {
  outline: 2px solid var(--orange-lt);
  outline-offset: 3px;
  border-radius: 1px;
}

.skip-link:focus-visible { outline-offset: 2px; }

@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;
  }

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

  .site-nav,
  .site-nav[data-open="true"] {
    transition: none !important;
  }
}