/* =========================================================
   美博体育 · 共享样式 /assets/site.css
   深墨绿战术板底 + 电光青交互 + 熔金橙数据高亮
   ========================================================= */

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

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

ul, ol { list-style: none; }

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

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

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

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

[hidden] { display: none !important; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --ink-900: #06231C;
  --ink-800: #0B3028;
  --ink-700: #10453A;
  --ink-600: #155A4B;
  --cyan-500: #2FE6C8;
  --cyan-300: #8CF3E4;
  --gold-500: #F2A234;
  --gold-300: #FFD08A;
  --loss: #E4593F;
  --chalk: #EAF4F1;
  --mist: #9DB5AF;

  --line: rgba(47, 230, 200, .20);
  --line-soft: rgba(234, 244, 241, .10);

  --rail-w: 88px;
  --shell-max: 1240px;
  --gutter: clamp(18px, 4vw, 44px);

  --r-sm: 4px;
  --r-md: 8px;
  --r-pill: 999px;

  --font-sans: "HarmonyOS Sans SC", "Source Han Sans SC", "Noto Sans SC",
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-num: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;

  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  margin: 0;
  padding-left: var(--rail-w);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 520px at 82% -12%, rgba(47, 230, 200, .10), transparent 60%),
    radial-gradient(760px 420px at 6% 108%, rgba(242, 162, 52, .07), transparent 62%);
  background-repeat: no-repeat;
  color: var(--chalk);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-sans);
  font-weight: 800;
  font-stretch: condensed;
  line-height: 1.28;
  color: var(--chalk);
}

h1 { font-size: clamp(34px, 5.2vw, 64px); letter-spacing: .10em; line-height: 1.15; }
h2 { font-size: clamp(24px, 3vw, 32px); letter-spacing: .07em; }
h3 { font-size: clamp(19px, 2.2vw, 24px); letter-spacing: .05em; }
h4 { font-size: 18px; letter-spacing: .04em; }

p { font-size: 17px; line-height: 1.75; }

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

::selection { background: var(--cyan-500); color: var(--ink-900); }

.num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.muted { color: var(--mist); }

/* ---------- 4. 焦点与可访问性 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan-500);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  top: -72px;
  left: calc(var(--rail-w) + 12px);
  z-index: 200;
  padding: 11px 18px;
  border-radius: var(--r-sm);
  background: var(--cyan-500);
  color: var(--ink-900);
  font-size: 13px;
  letter-spacing: .1em;
  transition: top .2s var(--ease);
}

.skip-link:focus { top: 10px; }

/* ---------- 5. 布局容器与栅格 ---------- */
.shell {
  width: min(var(--shell-max), 100% - var(--gutter) * 2);
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: clamp(48px, 7vw, 96px);
}

.grid {
  display: grid;
  gap: clamp(16px, 2vw, 28px);
}

.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)); }
.grid--offset { margin-left: clamp(0px, 4vw, 72px); }

/* ---------- 6. 文本组件 ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--cyan-300);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--gold-500);
}

.prose { max-width: 38em; color: var(--chalk); }
.prose--lead { max-width: 34em; font-size: 18px; color: var(--cyan-300); }
.prose p + p { margin-top: 1em; }
.prose ul { margin-top: .8em; }
.prose li { position: relative; padding-left: 18px; }
.prose li + li { margin-top: .45em; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 1px;
  background: var(--cyan-500);
}
.prose a {
  color: var(--cyan-500);
  border-bottom: 1px solid var(--line);
}
.prose a:hover { color: var(--cyan-300); border-bottom-color: var(--cyan-300); }

/* ---------- 7. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .55em;
  padding: .76em 1.35em;
  border: 1px solid var(--cyan-500);
  border-radius: var(--r-sm);
  background: var(--cyan-500);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .1em;
  transition: background-color .2s var(--ease), color .2s var(--ease),
              border-color .2s var(--ease), transform .2s var(--ease);
}

.btn:hover { transform: translateY(-2px); background: var(--cyan-300); border-color: var(--cyan-300); }

.btn--ghost {
  background: transparent;
  color: var(--cyan-300);
  border-color: var(--line);
}

.btn--ghost:hover {
  background: rgba(47, 230, 200, .08);
  color: var(--cyan-500);
  border-color: var(--cyan-500);
}

.btn--gold {
  background: transparent;
  color: var(--gold-300);
  border-color: rgba(242, 162, 52, .45);
}

.btn--gold:hover {
  background: rgba(242, 162, 52, .12);
  color: var(--gold-500);
  border-color: var(--gold-500);
  transform: translateY(-2px);
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-pill);
  background: rgba(234, 244, 241, .03);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mist);
}

.chip--gold {
  color: var(--gold-300);
  border-color: rgba(242, 162, 52, .40);
  background: rgba(242, 162, 52, .08);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--mist);
}

.breadcrumb li { display: flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }
.breadcrumb a { color: var(--cyan-300); }
.breadcrumb a:hover { color: var(--cyan-500); }
.breadcrumb [aria-current="page"] { color: var(--chalk); }

/* ---------- 9. 卡片与数据组件 ---------- */
.card {
  position: relative;
  padding: clamp(16px, 2.2vw, 26px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--ink-700);
  box-shadow: inset 0 1px 0 rgba(234, 244, 241, .04), inset 0 -22px 40px rgba(6, 35, 28, .45);
  transition: border-color .2s var(--ease), transform .2s var(--ease);
}

.card:hover { border-color: var(--cyan-500); transform: translateY(-2px); }
.card--flat { background: var(--ink-800); box-shadow: none; }

.card__title {
  margin-bottom: 10px;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .06em;
  color: var(--chalk);
}

.card__meta {
  font-size: 12.5px;
  letter-spacing: .06em;
  color: var(--mist);
}

.score-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-sm);
  background: var(--line-soft);
}

.score-bar__item {
  flex: 1 1 140px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 14px 16px;
  background: var(--ink-800);
}

.score-bar__num {
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.1;
  color: var(--gold-500);
}

.score-bar__label {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

.stat {
  padding-left: 14px;
  border-left: 2px solid var(--gold-500);
}

.stat__num {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.1;
  color: var(--gold-500);
}

.stat__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--mist);
}

/* ---------- 10. 视觉容器与分割线 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(158deg, var(--ink-700), var(--ink-900));
}

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

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

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .5;
  background-image:
    repeating-linear-gradient(0deg, rgba(47, 230, 200, .12) 0 1px, transparent 1px 30px),
    repeating-linear-gradient(90deg, rgba(47, 230, 200, .12) 0 1px, transparent 1px 30px);
}

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2;
  padding: 12px 15px;
  background: linear-gradient(0deg, rgba(6, 35, 28, .94), rgba(6, 35, 28, 0));
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan-300);
}

.viz-frame {
  overflow: hidden;
  padding: clamp(14px, 2vw, 22px);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, var(--ink-700), var(--ink-900));
}

.viz-frame svg { width: 100%; height: auto; }

.halfway-divider {
  position: relative;
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, transparent, var(--cyan-500) 10%, var(--line-soft) 52%, transparent);
}

.halfway-divider::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 7px;
  height: 7px;
  margin: -3.5px 0 0 -3.5px;
  border: 1px solid var(--gold-500);
  border-radius: 50%;
  background: var(--ink-900);
}

/* ---------- 11. 时间轴 ---------- */
.timeline {
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.timeline__item {
  position: relative;
  padding: 0 0 22px 12px;
}

.timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 9px;
  width: 7px;
  height: 7px;
  border: 1px solid var(--cyan-500);
  border-radius: 50%;
  background: var(--ink-900);
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.timeline__item:hover::before { background: var(--gold-500); border-color: var(--gold-500); }

.timeline__time {
  display: block;
  font-family: var(--font-num);
  font-variant-numeric: tabular-nums;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--gold-500);
}

/* ---------- 12. 主题筛选 ---------- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 12px 0;
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
}

.filter-btn {
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--mist);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.filter-btn:hover { color: var(--chalk); border-color: var(--cyan-300); }

.filter-btn[aria-pressed="true"] {
  background: var(--cyan-500);
  border-color: var(--cyan-500);
  color: var(--ink-900);
  font-weight: 700;
}

.filter-count {
  margin-left: auto;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--gold-500);
}

/* ---------- 13. 页头：品牌轨道 ---------- */
.site-header { position: relative; z-index: 50; }

.site-rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 70;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  background: var(--ink-800);
  border-right: 1px solid var(--line-soft);
}

.site-rail__mark {
  padding: 6px 3px;
  border: 1px solid var(--line);
  border-radius: 3px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--cyan-500);
}

.site-rail__name {
  writing-mode: vertical-rl;
  font-size: 13px;
  letter-spacing: .5em;
  color: var(--mist);
}

.site-rail__ticks { display: flex; flex-direction: column; gap: 6px; }
.site-rail__ticks i { display: block; width: 18px; height: 1px; background: var(--line); }

.site-rail__status {
  writing-mode: vertical-rl;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--gold-500);
}

/* ---------- 14. 页头：刊头 ---------- */
.masthead {
  padding: clamp(16px, 2.4vw, 28px) var(--gutter) clamp(12px, 1.6vw, 18px);
  background: linear-gradient(180deg, var(--ink-800) 0%, var(--ink-900) 94%);
  border-bottom: 1px solid var(--line-soft);
}

.masthead__top {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  width: min(var(--shell-max), 100%);
  margin-inline: auto;
}

.masthead__brand { text-align: center; }

.masthead__brand-name {
  display: block;
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 800;
  font-stretch: condensed;
  line-height: 1;
  letter-spacing: .16em;
  text-indent: .16em;
  color: var(--chalk);
}

.masthead__brand-line {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--mist);
}

/* 版本号状态胶囊 */
.version-chip-wrap { position: relative; justify-self: start; }

.version-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 13px;
  border: 1px solid rgba(242, 162, 52, .40);
  border-radius: var(--r-pill);
  background: rgba(242, 162, 52, .08);
  color: var(--gold-300);
  font-size: 12px;
  letter-spacing: .06em;
  transition: border-color .2s var(--ease), background-color .2s var(--ease);
}

.version-chip:hover { border-color: var(--gold-500); background: rgba(242, 162, 52, .14); }

.version-chip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gold-500);
  box-shadow: 0 0 0 3px rgba(242, 162, 52, .18);
}

.version-chip__num { font-size: 13px; color: var(--gold-500); }

.version-panel {
  position: absolute;
  left: 0;
  top: calc(100% + 10px);
  z-index: 80;
  width: min(330px, 78vw);
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--ink-800);
  box-shadow: 0 20px 44px rgba(0, 0, 0, .5);
}

.version-panel__title {
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold-300);
  margin-bottom: 8px;
}

.version-panel__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
}

.version-panel__list li + li { margin-top: 6px; }

.version-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 7px;
  height: 1px;
  background: var(--cyan-500);
}

/* 赛事索引锚点 */
.index-anchor {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--cyan-300);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.index-anchor::before { content: "←"; color: var(--cyan-500); }

.index-anchor:hover {
  color: var(--ink-900);
  background: var(--cyan-500);
  border-color: var(--cyan-500);
}

.index-anchor.is-docked {
  position: fixed;
  top: 14px;
  right: 20px;
  z-index: 90;
  background: var(--ink-800);
  border-color: var(--line);
  box-shadow: 0 12px 30px rgba(0, 0, 0, .45);
}

/* 移动导航开关 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  width: min(var(--shell-max), 100%);
  margin: 14px auto 0;
  padding: 12px 15px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: rgba(47, 230, 200, .05);
  color: var(--cyan-300);
  font-size: 13px;
  letter-spacing: .14em;
}

.nav-toggle__bars {
  position: relative;
  width: 20px;
  height: 10px;
  border-top: 1px solid var(--cyan-500);
  border-bottom: 1px solid var(--cyan-500);
}

.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 30%;
  top: 50%;
  height: 1px;
  background: var(--cyan-500);
}

.nav-toggle[aria-expanded="true"] { background: rgba(47, 230, 200, .12); color: var(--cyan-500); }

/* ---------- 15. 页头：导航与步骤条 ---------- */
.masthead__nav {
  width: min(var(--shell-max), 100%);
  margin: 20px auto 0;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(12px, 2.6vw, 38px);
}

.nav-list a {
  position: relative;
  display: block;
  padding: 8px 2px;
  font-size: 14.5px;
  letter-spacing: .14em;
  color: var(--mist);
  transition: color .2s var(--ease);
}

.nav-list a::after {
  content: "";
  position: absolute;
  left: 50%;
  right: 50%;
  bottom: 0;
  height: 2px;
  background: var(--cyan-500);
  transition: left .2s var(--ease), right .2s var(--ease);
}

.nav-list a:hover { color: var(--chalk); }
.nav-list a:hover::after { left: 0; right: 0; }

.nav-list a[aria-current="page"] { color: var(--cyan-500); }
.nav-list a[aria-current="page"]::after { left: 0; right: 0; }

.masthead__foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 20px;
  width: min(var(--shell-max), 100%);
  margin: 18px auto 0;
  padding-top: 13px;
  border-top: 1px solid var(--line-soft);
}

.stepbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  counter-reset: step;
}

.stepbar__item {
  display: flex;
  align-items: center;
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--mist);
}

.stepbar__item + .stepbar__item::before {
  content: "";
  width: 24px;
  height: 1px;
  margin-inline: 12px;
  background: var(--line);
}

.stepbar__item a {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.stepbar__item a::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-num);
  font-size: 11px;
  color: var(--gold-500);
}

.stepbar__item a:hover { color: var(--cyan-300); border-bottom-color: var(--cyan-500); }
.stepbar__item a[aria-current="page"] { color: var(--cyan-500); border-bottom-color: var(--cyan-500); }

.masthead__cta { flex: 0 0 auto; }

/* ---------- 16. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 110px);
  background: var(--ink-800);
  border-top: 1px solid var(--line-soft);
}

.site-footer .halfway-divider { position: absolute; top: 0; left: 0; right: 0; }

.site-footer .halfway-divider::before { background: var(--ink-800); }

.footer__inner {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.4fr;
  gap: clamp(20px, 3vw, 44px);
  width: min(var(--shell-max), 100% - var(--gutter) * 2);
  margin-inline: auto;
  padding: clamp(34px, 5vw, 64px) 0 clamp(24px, 3vw, 40px);
}

.footer__brand-name {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: .18em;
  color: var(--chalk);
}

.footer__brand-line {
  margin-top: 10px;
  font-size: 13.5px;
  letter-spacing: .06em;
  color: var(--cyan-300);
}

.footer__note {
  margin-top: 12px;
  max-width: 30ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.footer__title {
  margin-bottom: 14px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .24em;
  color: var(--mist);
}

.footer__links li + li { margin-top: 9px; }

.footer__links a {
  font-size: 14px;
  color: var(--chalk);
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.footer__links a:hover { color: var(--cyan-500); border-bottom-color: var(--cyan-500); }
.footer__links a[aria-current="page"] { color: var(--cyan-500); }

.footer__contact li {
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--mist);
}

.footer__contact li + li { margin-top: 6px; }

.footer__bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 26px;
  width: min(var(--shell-max), 100% - var(--gutter) * 2);
  margin-inline: auto;
  padding: 20px 0 34px;
  border-top: 1px solid var(--line-soft);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}

.footer__region,
.footer__update { flex: 1 1 260px; }

.footer__legal { flex: 1 1 100%; color: var(--mist); }
.footer__icp { color: var(--gold-300); }

/* ---------- 17. 动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .24s ease-out, transform .24s ease-out;
}

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

/* ---------- 18. 响应式 ---------- */
@media (max-width: 1180px) {
  :root { --rail-w: 64px; }
  .footer__inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 980px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--offset { margin-left: 0; }
}

@media (max-width: 880px) {
  :root { --rail-w: 0px; }

  body { font-size: 16.5px; }

  .site-rail { display: none; }

  .skip-link { left: 12px; }

  .masthead__top {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "chip anchor"
      "brand brand";
    gap: 12px;
  }

  .version-chip-wrap { grid-area: chip; }
  .index-anchor { grid-area: anchor; }
  .masthead__brand { grid-area: brand; margin-top: 6px; }
  .masthead__brand-name { letter-spacing: .12em; text-indent: .12em; }

  .nav-toggle { display: flex; }

  .masthead__nav { display: none; margin-top: 10px; }

  .masthead__nav[data-open] {
    display: block;
    padding: 6px 14px 10px;
    border: 1px solid var(--line);
    border-radius: var(--r-sm);
    background: var(--ink-800);
  }

  .nav-list { flex-direction: column; gap: 0; justify-content: flex-start; }

  .nav-list a {
    padding: 13px 4px;
    border-bottom: 1px solid var(--line-soft);
    font-size: 15px;
    letter-spacing: .1em;
  }

  .nav-list li:last-child a { border-bottom: 0; }
  .nav-list a::after { display: none; }
  .nav-list a[aria-current="page"] { color: var(--cyan-500); }

  .masthead__foot { flex-direction: column; align-items: stretch; }
  .stepbar { flex-direction: column; align-items: flex-start; gap: 4px; }
  .stepbar__item + .stepbar__item::before { display: none; }
  .masthead__cta { align-self: flex-start; }

  .index-anchor.is-docked { top: 10px; right: 10px; }

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

  .footer__inner { grid-template-columns: 1fr; }
  .footer__bar { flex-direction: column; gap: 10px; }
}

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

  .score-bar__item { flex: 1 1 100%; }
  .version-panel { width: min(300px, 86vw); }
  .footer__bar { padding-bottom: 28px; }
}

/* ---------- 19. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  html.js [data-reveal] { opacity: 1; transform: none; }
  .card:hover,
  .btn:hover,
  .btn--gold:hover { transform: none; }
}