/* ==========================================================================
   九州娱乐赛事 · 共享样式表  /assets/site.css
   午夜转播间 · 长卷索引
   ========================================================================== */

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

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.78;
  font-weight: 400;
  letter-spacing: .012em;
  color: var(--cream);
  background-color: #071A15;
  background-image:
    radial-gradient(980px 460px at 86% -8%, rgba(217, 164, 65, .15), rgba(217, 164, 65, 0) 64%),
    radial-gradient(760px 420px at 2% 12%, rgba(46, 125, 107, .24), rgba(46, 125, 107, 0) 70%),
    linear-gradient(rgba(245, 238, 220, .028) 1px, rgba(245, 238, 220, 0) 1px),
    linear-gradient(90deg, rgba(245, 238, 220, .028) 1px, rgba(245, 238, 220, 0) 1px),
    linear-gradient(180deg, #071A15 0%, #07201A 46%, #071A15 100%);
  background-size: auto, auto, 64px 64px, 64px 64px, auto;
  background-repeat: no-repeat, no-repeat, repeat, repeat, no-repeat;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

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

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

a { color: inherit; text-decoration: none; }

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 品牌色 */
  --ink: #071A15;
  --ink-2: #0A211B;
  --pine: #103129;
  --pine-2: #143A30;
  --gold: #D9A441;
  --gold-soft: #F0C96A;
  --card-red: #E5483F;
  --card-yellow: #F2C230;
  --cream: #F5EEDC;
  --slate: #8A9A94;
  --umber: #1A1410;
  --teal: #2E7D6B;
  --teal-soft: #63C4AD;

  /* 结构与描边 */
  --line: rgba(217, 164, 65, .26);
  --line-soft: rgba(138, 154, 148, .22);
  --panel-grad: linear-gradient(158deg, #103129 0%, #0C2620 58%, #0A1F1A 100%);

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

  /* 尺寸 */
  --shell: 1240px;
  --gutter: clamp(16px, 4vw, 40px);
  --radius: 16px;
  --radius-lg: 26px;
  --cut: 16px;
}

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: .012em;
  color: var(--cream);
}

h1 { font-size: clamp(34px, 6vw, 66px); }
h2 { font-size: clamp(26px, 4vw, 44px); }
h3 { font-size: clamp(20px, 2.4vw, 27px); }
h4 { font-size: clamp(17px, 1.8vw, 20px); }

p { margin: 0 0 1em; }
p:last-child { margin-bottom: 0; }

strong { color: var(--gold-soft); font-weight: 700; }

::selection { background: var(--gold); color: var(--umber); }

/* ---------- 4. 聚焦与可访问 ---------- */
:focus-visible {
  outline: 2px solid var(--gold-soft);
  outline-offset: 3px;
  border-radius: 6px;
}

[id] { scroll-margin-top: 118px; }

/* ---------- 5. 容器与章节 ---------- */
.board-container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.board-section { padding: clamp(48px, 7vw, 96px) 0; }
.board-section--tight { padding: clamp(30px, 4vw, 54px) 0; }

.board-rule {
  position: relative;
  height: 1px;
  border: 0;
  margin: clamp(28px, 4vw, 52px) 0;
  background: linear-gradient(90deg, var(--line), rgba(138, 154, 148, .14) 55%, rgba(138, 154, 148, 0));
}

.board-rule::before {
  content: "";
  position: absolute;
  left: 0;
  top: -2px;
  width: 64px;
  height: 5px;
  background: linear-gradient(90deg, var(--gold), var(--card-yellow));
  border-radius: 3px;
}

.board-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

/* ---------- 6. 小标、标题与注释 ---------- */
.board-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--gold);
}

.board-eyebrow::before {
  content: "";
  width: 30px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(217, 164, 65, 0));
}

.board-side-note {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--slate);
  writing-mode: vertical-rl;
  text-orientation: mixed;
}

.board-title { margin: 14px 0 0; }

.board-lead {
  margin-top: 18px;
  max-width: 62ch;
  font-size: clamp(16px, 1.5vw, 18.5px);
  color: rgba(245, 238, 220, .82);
}

.board-note {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--slate);
}

.board-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--gold-soft);
}

/* ---------- 7. 按钮 ---------- */
.board-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .05em;
  white-space: nowrap;
  cursor: pointer;
  transition: transform .18s ease, background-color .18s ease, color .18s ease,
              border-color .18s ease, box-shadow .18s ease;
}

.board-btn--gold {
  background: linear-gradient(180deg, var(--gold-soft), var(--gold));
  color: var(--umber);
  box-shadow: 0 14px 30px -18px rgba(217, 164, 65, .95);
}

.board-btn--gold:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 34px -16px rgba(217, 164, 65, .95);
}

.board-btn--ghost {
  background: rgba(16, 49, 41, .66);
  color: var(--cream);
  border-color: var(--line);
}

.board-btn--ghost:hover {
  transform: translateY(-2px);
  border-color: var(--gold);
  color: var(--gold-soft);
}

.board-btn--sm { padding: 9px 16px; font-size: 13.5px; }

/* ---------- 8. 标签 ---------- */
.board-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border-radius: 999px;
  border: 1px solid currentColor;
  background: rgba(16, 49, 41, .6);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: .06em;
  line-height: 1.6;
  color: var(--slate);
}

.board-tag--gold { color: var(--gold); background: rgba(217, 164, 65, .12); }
.board-tag--red { color: var(--card-red); background: rgba(229, 72, 63, .14); }
.board-tag--yellow { color: var(--card-yellow); background: rgba(242, 194, 48, .14); }
.board-tag--teal { color: var(--teal-soft); background: rgba(46, 125, 107, .22); }
.board-tag--slate { color: var(--slate); background: rgba(138, 154, 148, .1); }

/* ---------- 9. 卡片与面板 ---------- */
.board-card {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--panel-grad);
  overflow: hidden;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.board-card::after {
  content: "";
  position: absolute;
  left: 0;
  top: 22px;
  width: 3px;
  height: 44px;
  border-radius: 0 3px 3px 0;
  background: linear-gradient(180deg, var(--gold), rgba(217, 164, 65, 0));
}

.board-card:hover {
  border-color: rgba(217, 164, 65, .5);
  transform: translateY(-3px);
  box-shadow: 0 26px 48px -34px rgba(0, 0, 0, .95);
}

.board-card__title {
  font-family: var(--font-display);
  font-size: clamp(18px, 1.8vw, 21px);
  font-weight: 700;
  color: var(--cream);
  margin-bottom: 10px;
}

.board-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--slate);
  margin-top: 16px;
}

.board-panel {
  padding: clamp(20px, 3vw, 36px);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, rgba(16, 49, 41, .92), rgba(10, 33, 27, .82));
}

/* ---------- 10. 网格与清单 ---------- */
.board-grid { display: grid; gap: clamp(16px, 2.2vw, 26px); }
.board-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.board-grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.board-list { display: grid; gap: 12px; }

.board-list__item {
  position: relative;
  padding-left: 22px;
  font-size: 16px;
  line-height: 1.78;
}

.board-list__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 8px;
  background: var(--gold);
  transform: rotate(45deg);
}

/* ---------- 11. 图片容器 ---------- */
.board-media {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background:
    linear-gradient(135deg, rgba(217, 164, 65, .16), rgba(46, 125, 107, .2)),
    #0B241D;
}

.board-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.board-media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    repeating-linear-gradient(115deg, rgba(245, 238, 220, .05) 0 1px, rgba(245, 238, 220, 0) 1px 46px),
    linear-gradient(180deg, rgba(7, 26, 21, .32), rgba(7, 26, 21, 0) 46%);
}

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

.board-media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 16px 18px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--cream);
  background: linear-gradient(180deg, rgba(7, 26, 21, 0), rgba(7, 26, 21, .94));
}

/* ---------- 12. 横向轨道 ---------- */
.board-rail {
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  padding: 6px 4px 22px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.board-rail::-webkit-scrollbar { height: 8px; }
.board-rail::-webkit-scrollbar-track { background: rgba(16, 49, 41, .7); border-radius: 99px; }
.board-rail::-webkit-scrollbar-thumb {
  border-radius: 99px;
  background: linear-gradient(90deg, var(--gold), var(--teal));
}

.board-rail__item {
  flex: 0 0 clamp(240px, 30vw, 332px);
  scroll-snap-align: start;
  transition: transform .2s ease;
}

.board-rail__item:hover { transform: translateY(-4px); }

/* ---------- 13. 期数索引 ---------- */
.board-index {
  position: sticky;
  top: 118px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.board-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px;
  border-left: 2px solid transparent;
  border-radius: 0 10px 10px 0;
  font-size: 14px;
  color: var(--slate);
  transition: color .18s ease, border-color .18s ease, background-color .18s ease;
}

.board-index__link:hover {
  color: var(--cream);
  background: rgba(16, 49, 41, .72);
  border-left-color: var(--gold);
}

.board-index__link[aria-current="true"] {
  color: var(--gold-soft);
  border-left-color: var(--card-red);
  background: rgba(229, 72, 63, .1);
}

/* ---------- 14. 折叠面板 ---------- */
.board-accordion {
  border: 1px solid var(--line-soft);
  border-radius: 14px;
  background: rgba(16, 49, 41, .45);
  overflow: hidden;
}

.board-accordion + .board-accordion { margin-top: 12px; }

.board-accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 16px 20px;
  cursor: pointer;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--cream);
  transition: color .18s ease, background-color .18s ease;
}

.board-accordion__trigger:hover { color: var(--gold-soft); background: rgba(217, 164, 65, .07); }

.board-accordion__trigger::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 18px;
}

.board-accordion[open] .board-accordion__trigger::after { content: "−"; }

.board-accordion__panel {
  padding: 0 20px 18px;
  font-size: 15.5px;
  color: rgba(245, 238, 220, .82);
}

/* ---------- 15. 面包屑 ---------- */
.board-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--slate);
}

.board-crumbs__link {
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

.board-crumbs__link:hover { color: var(--gold-soft); border-bottom-color: var(--gold); }

.board-crumbs__sep { color: rgba(138, 154, 148, .5); }

.board-crumbs__current { color: var(--cream); }

/* ---------- 16. 显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity .5s ease, transform .5s ease;
}

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

/* ---------- 17. 跳至正文 ---------- */
.board-skip {
  position: fixed;
  left: 16px;
  top: -120px;
  z-index: 200;
  padding: 12px 20px;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--gold-soft), var(--gold));
  color: var(--umber);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .04em;
  transition: top .2s ease;
}

.board-skip:focus { top: 16px; }

/* ---------- 18. 页头 ---------- */
.board-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 14px clamp(12px, 3vw, 30px) 12px;
  background: rgba(7, 26, 21, .9);
  border-bottom: 1px solid rgba(217, 164, 65, .14);
  backdrop-filter: blur(12px) saturate(120%);
  -webkit-backdrop-filter: blur(12px) saturate(120%);
}

.board-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  transform: scaleX(var(--progress, 0));
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--gold) 0%, var(--card-yellow) 42%, var(--card-red) 78%, var(--teal) 100%);
  will-change: transform;
}

.board-capsule {
  position: relative;
  max-width: var(--shell);
  margin: 0 auto;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  padding: 8px 10px 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: linear-gradient(118deg, #103129 0%, #0D2A22 55%, #143A30 100%);
  box-shadow: 0 22px 46px -30px rgba(0, 0, 0, .95), inset 0 1px 0 rgba(245, 238, 220, .06);
}

.board-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.board-brand__mark {
  flex: none;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  color: var(--umber);
  background: linear-gradient(150deg, var(--gold-soft), var(--gold) 58%, #B4832C);
  clip-path: polygon(24% 0, 100% 0, 100% 76%, 76% 100%, 0 100%, 0 24%);
}

.board-brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.board-brand__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .06em;
  color: var(--cream);
  white-space: nowrap;
}

.board-brand__tag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--slate);
  white-space: nowrap;
}

.board-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.board-nav__item { display: flex; }

.board-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 8px 13px;
  border-radius: 999px;
  font-size: 15px;
  color: var(--slate);
  white-space: nowrap;
  transition: color .18s ease, background-color .18s ease, box-shadow .18s ease;
}

.board-nav__link::after {
  content: "";
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 4px;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .2s ease;
}

.board-nav__link:hover { color: var(--cream); }
.board-nav__link:hover::after { transform: scaleX(1); }

.board-nav__link[aria-current="page"] {
  color: var(--gold-soft);
  background: rgba(217, 164, 65, .13);
  box-shadow: inset 0 0 0 1px rgba(217, 164, 65, .5);
}

.board-nav__link[aria-current="page"]::after { transform: scaleX(0); }

.board-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.board-nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--gold);
  background: rgba(217, 164, 65, .08);
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.board-nav-toggle:hover { background: rgba(217, 164, 65, .18); }

.board-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
}

.board-nav-toggle__bars::before,
.board-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform .2s ease;
}

.board-nav-toggle__bars::before { top: -6px; }
.board-nav-toggle__bars::after { top: 6px; }

.board-header[data-open] .board-nav-toggle {
  background: var(--gold);
  color: var(--umber);
  border-color: var(--gold);
}

.board-header[data-open] .board-nav-toggle__bars { background: transparent; }
.board-header[data-open] .board-nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.board-header[data-open] .board-nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 19. 页脚 ---------- */
.board-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 112px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, #0A211B 0%, var(--umber) 46%, #120D0A 100%);
  color: var(--cream);
}

.board-footer__stripe {
  height: 5px;
  background: linear-gradient(90deg,
    var(--gold) 0 22%,
    var(--card-yellow) 22% 30%,
    var(--card-red) 30% 38%,
    rgba(217, 164, 65, .22) 38% 100%);
}

.board-footer__inner {
  max-width: var(--shell);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 74px) var(--gutter) clamp(28px, 4vw, 46px);
  display: grid;
  grid-template-columns: 1.4fr .75fr 1.25fr;
  gap: clamp(28px, 4vw, 52px);
}

.board-footer__logo {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: .04em;
  color: var(--cream);
}

.board-footer__line {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .2em;
  color: var(--gold);
}

.board-footer__note {
  margin-top: 14px;
  max-width: 42ch;
  font-size: 14px;
  line-height: 1.82;
  color: var(--slate);
}

.board-footer__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--gold);
}

.board-footer__title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: linear-gradient(90deg, var(--line), rgba(217, 164, 65, 0));
}

.board-footer__links ul { display: grid; gap: 2px; }

.board-footer__link {
  display: inline-block;
  padding: 5px 0;
  font-size: 15px;
  color: var(--slate);
  transition: color .18s ease, text-decoration-color .18s ease;
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 6px;
}

.board-footer__link:hover {
  color: var(--gold-soft);
  text-decoration-color: var(--gold);
}

.board-footer__contact { min-width: 0; }

.board-footer__item { margin-bottom: 16px; }

.board-footer__label {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--slate);
}

.board-footer__item .board-footer__note { margin-top: 0; }

.board-copyrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.board-copyrow__text {
  font-family: var(--font-mono);
  font-size: 13.5px;
  letter-spacing: .02em;
  color: var(--cream);
  word-break: break-all;
}

.board-copy {
  flex: none;
  padding: 4px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--gold);
  background: rgba(217, 164, 65, .08);
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.board-copy:hover {
  background: var(--gold);
  color: var(--umber);
  border-color: var(--gold);
}

.board-copy[data-state="done"] {
  background: var(--teal);
  border-color: var(--teal);
  color: #06231C;
}

.board-footer__base {
  max-width: var(--shell);
  margin: 0 auto;
  padding: 18px var(--gutter) 34px;
  border-top: 1px solid rgba(245, 238, 220, .08);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
}

.board-footer__legal {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--slate);
}

/* ---------- 20. 平板 ---------- */
@media (max-width: 1080px) {
  .board-nav__link { padding: 8px 10px; font-size: 14.5px; }
  .board-footer__inner { grid-template-columns: 1.3fr 1fr; }
  .board-footer__contact { grid-column: 1 / -1; }
}

@media (max-width: 960px) {
  html { scroll-padding-top: 96px; }

  .board-capsule {
    grid-template-columns: auto auto;
    justify-content: space-between;
    padding: 8px 10px 8px 12px;
  }

  .board-nav {
    position: absolute;
    top: calc(100% + 12px);
    left: 0;
    right: 0;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 24px;
    background: linear-gradient(160deg, #103129, #0B241D);
    box-shadow: 0 34px 64px -34px rgba(0, 0, 0, .98);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity .18s ease, transform .18s ease, visibility .18s ease;
  }

  .board-header[data-open] .board-nav {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .board-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .board-nav__item { display: block; }

  .board-nav__link {
    width: 100%;
    justify-content: flex-start;
    padding: 13px 16px;
    border-radius: 16px;
    font-size: 16px;
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: .04em;
  }

  .board-nav__link::after { display: none; }

  .board-nav-toggle { display: grid; }

  .board-index { position: static; }
}

/* ---------- 21. 手机 ---------- */
@media (max-width: 760px) {
  body { font-size: 16.5px; }

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

  .board-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .board-footer__contact { grid-column: auto; }
}

@media (max-width: 620px) {
  .board-brand__tag { display: none; }
  .board-header__actions .board-btn--sm { padding: 8px 12px; font-size: 12.5px; }
  .board-brand__name { font-size: 16px; }
  .board-footer__base { justify-content: flex-start; }
}

@media (max-width: 420px) {
  .board-header__actions .board-btn--sm { display: none; }
  .board-brand__mark { width: 38px; height: 38px; font-size: 18px; }
}

/* ---------- 22. 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }

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

  .board-card:hover,
  .board-btn:hover,
  .board-rail__item:hover {
    transform: none;
  }
}