/* ============================================================
   凤凰体育 · 共享样式表 /assets/site.css
   夜看台墨绿基底 + 记分牌等宽数字 + 展览展签索引
   ============================================================ */

/* ---------- reset ---------- */
*,
*::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;
  background: var(--fs-ink);
  color: var(--fs-white);
  font-family: var(--fs-sans);
  font-size: 1rem;
  line-height: 1.75;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

:where(h1, h2, h3, h4, h5, p, ul, ol, figure, blockquote, dl, dd) { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { 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%; }
hr { border: 0; }

/* ---------- 变量 ---------- */
:root {
  --fs-ink: #0B1F1A;
  --fs-charcoal: #14181A;
  --fs-pitch: #14342B;
  --fs-white: #F4F7F6;
  --fs-flame: #FF5A1F;
  --fs-gold: #FFB020;
  --fs-sage: #A8BDB4;
  --fs-cyan: #21E6C1;
  --fs-alert: #C0392B;
  --fs-glass: rgba(244, 247, 246, 0.08);
  --fs-glass-line: rgba(244, 247, 246, 0.16);
  --fs-hairline: rgba(244, 247, 246, 0.10);
  --fs-mono: ui-monospace, "SFMono-Regular", "Cascadia Mono", Consolas, "Liberation Mono", Menlo, monospace;
  --fs-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans CJK SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --fs-max: 1280px;
  --fs-gutter: clamp(1rem, 4vw, 3rem);
  --fs-header-h: 76px;
  --fs-radius: 4px;
  --fs-ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 中文排版与通用元素 ---------- */
h1, h2, h3, h4 {
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.18;
  text-wrap: balance;
}

p { overflow-wrap: break-word; }

::selection { background: var(--fs-flame); color: var(--fs-charcoal); }

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

.fs-num {
  font-family: var(--fs-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
  line-height: 1.1;
}

.fs-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 容器与网格 ---------- */
.fs-container {
  width: min(var(--fs-max), 100% - (var(--fs-gutter) * 2));
  margin-inline: auto;
}

.fs-container--narrow {
  width: min(760px, 100% - (var(--fs-gutter) * 2));
  margin-inline: auto;
}

.fs-grid {
  display: grid;
  gap: clamp(1rem, 2.5vw, 2rem);
}

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

/* ---------- 展区骨架 ---------- */
.fs-section {
  position: relative;
  padding-block: clamp(3rem, 8vw, 6.5rem);
}

.fs-section--pitch { background: var(--fs-pitch); }
.fs-section--charcoal { background: var(--fs-charcoal); }

.fs-section__head {
  display: grid;
  gap: 0.85rem;
  max-width: 62ch;
}

.fs-section__index {
  font-family: var(--fs-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.32em;
  color: var(--fs-flame);
}

.fs-section__title { font-size: clamp(1.75rem, 3.8vw, 2.5rem); }

.fs-section__body { margin-top: clamp(1.5rem, 4vw, 2.75rem); }

.fs-lede {
  color: var(--fs-sage);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  max-width: 46ch;
}

.fs-prose { max-width: 68ch; }
.fs-prose > * + * { margin-top: 1.1em; }
.fs-prose h2, .fs-prose h3 { margin-top: 2em; font-size: 1.375rem; }
.fs-prose a {
  color: var(--fs-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.fs-prose ul { padding-left: 0; }
.fs-prose li { position: relative; padding-left: 1.35em; margin-top: 0.5em; }
.fs-prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.85em;
  width: 8px;
  height: 1px;
  background: var(--fs-flame);
}
.fs-prose strong { color: var(--fs-gold); font-weight: 700; }

/* ---------- 展签式注释 ---------- */
.fs-note {
  font-size: 0.75rem;
  letter-spacing: 0.28em;
  color: var(--fs-sage);
  line-height: 1.9;
}

.fs-note--vertical {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  letter-spacing: 0.32em;
}

/* ---------- 标签 ---------- */
.fs-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  padding: 0.28em 0.72em;
  border: 1px solid var(--fs-glass-line);
  border-radius: 999px;
  background: var(--fs-glass);
  color: var(--fs-sage);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  white-space: nowrap;
}

.fs-tag--flame { color: var(--fs-flame); border-color: rgba(255, 90, 31, 0.42); }
.fs-tag--gold { color: var(--fs-gold); border-color: rgba(255, 176, 32, 0.42); }

/* ---------- 玻璃层与细线 ---------- */
.fs-glass {
  background: var(--fs-glass);
  border: 1px solid var(--fs-glass-line);
  border-radius: var(--fs-radius);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.fs-divider {
  height: 1px;
  background: var(--fs-hairline);
  margin-block: clamp(1.5rem, 4vw, 2.5rem);
}

/* ---------- 按钮 ---------- */
.fs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5em;
  padding: 0.55em 1.05em;
  border: 1px solid transparent;
  border-radius: var(--fs-radius);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  white-space: nowrap;
  transition: background-color 0.24s var(--fs-ease),
              color 0.24s var(--fs-ease),
              border-color 0.24s var(--fs-ease);
}

.fs-btn--accent {
  background: var(--fs-flame);
  color: var(--fs-charcoal);
}
.fs-btn--accent:hover { background: #FF7038; }
.fs-btn--accent:active { background: #E24A14; }

.fs-btn--ghost {
  background: var(--fs-glass);
  border-color: var(--fs-glass-line);
  color: var(--fs-white);
}
.fs-btn--ghost:hover {
  border-color: var(--fs-cyan);
  color: var(--fs-cyan);
}

.fs-btn--link {
  padding: 0;
  color: var(--fs-cyan);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 3px;
  border-radius: 0;
}
.fs-btn--link:hover { color: var(--fs-gold); }

/* ---------- 面包屑 ---------- */
.fs-breadcrumb {
  font-family: var(--fs-mono);
  font-size: 0.8125rem;
  color: var(--fs-sage);
}

.fs-breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
}

.fs-breadcrumb__item + .fs-breadcrumb__item::before {
  content: "/";
  margin-right: 0.5rem;
  color: rgba(168, 189, 180, 0.5);
}

.fs-breadcrumb a { transition: color 0.2s var(--fs-ease); }
.fs-breadcrumb a:hover { color: var(--fs-cyan); }

/* ---------- 记分牌模块 ---------- */
.fs-scoreboard {
  padding: clamp(1.2rem, 3vw, 2.2rem);
  border: 1px solid var(--fs-glass-line);
  border-radius: var(--fs-radius);
  background: linear-gradient(180deg, rgba(20, 52, 43, 0.92), rgba(11, 31, 26, 0.92));
  text-align: center;
}

.fs-scoreboard__row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(0.9rem, 4vw, 3rem);
}

.fs-scoreboard__team {
  font-size: clamp(0.95rem, 2.2vw, 1.3rem);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.fs-scoreboard__score {
  font-family: var(--fs-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 4.2rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fs-white);
}

.fs-scoreboard__score em {
  font-style: normal;
  color: var(--fs-flame);
}

.fs-scoreboard__meta {
  margin-top: 0.9rem;
  font-family: var(--fs-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--fs-sage);
}

/* ---------- 看台阶梯 ---------- */
.fs-stairs {
  display: grid;
  gap: clamp(1rem, 2vw, 1.75rem);
}

.fs-stairs__step {
  position: relative;
  padding: clamp(1.1rem, 2.4vw, 1.8rem);
  border-radius: var(--fs-radius);
  background: var(--fs-pitch);
}

.fs-stairs__step:nth-child(even) {
  background: #102A23;
  margin-inline-start: clamp(0rem, 4vw, 3.5rem);
}

.fs-stairs__step:nth-child(odd) {
  margin-inline-end: clamp(0rem, 4vw, 3.5rem);
}

/* ---------- 图片容器（响应式占位基础） ---------- */
.fs-media {
  position: relative;
  overflow: hidden;
  border-radius: var(--fs-radius);
  aspect-ratio: 16 / 9;
  background-color: var(--fs-pitch);
  background-image: repeating-linear-gradient(
    115deg,
    rgba(244, 247, 246, 0.045) 0 12px,
    rgba(244, 247, 246, 0) 12px 24px
  );
}

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

.fs-media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.fs-media__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 0.8rem 1rem;
  background: linear-gradient(180deg, rgba(11, 31, 26, 0) 0%, rgba(11, 31, 26, 0.92) 100%);
  color: var(--fs-white);
  font-family: var(--fs-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
}

/* ---------- 警示卡片 ---------- */
.fs-alert {
  padding: 1rem 1.2rem;
  border-left: 3px solid var(--fs-alert);
  border-radius: 0 var(--fs-radius) var(--fs-radius) 0;
  background: rgba(192, 57, 43, 0.08);
}

.fs-alert__title {
  color: var(--fs-flame);
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

/* ---------- 折叠问答 ---------- */
.fs-qa { border-top: 1px solid var(--fs-hairline); }

.fs-qa__item { border-bottom: 1px solid var(--fs-hairline); }

.fs-qa__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  list-style: none;
}
.fs-qa__q::-webkit-details-marker { display: none; }
.fs-qa__q::after {
  content: "+";
  flex: none;
  font-family: var(--fs-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--fs-flame);
}
.fs-qa__item[open] .fs-qa__q::after { content: "–"; }

.fs-qa__a {
  padding-bottom: 1.2rem;
  color: var(--fs-sage);
  max-width: 64ch;
}
.fs-qa__a > * + * { margin-top: 0.8rem; }

/* ---------- 显现动效 ---------- */
.fs-js .fs-reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s var(--fs-ease), transform 0.4s var(--fs-ease);
}

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

/* ============================================================
   HEADER
   ============================================================ */
.fs-skip {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 80;
  padding: 0.75rem 1.25rem;
  background: var(--fs-flame);
  color: var(--fs-charcoal);
  font-weight: 700;
  font-size: 0.875rem;
  transform: translateY(-140%);
  transition: transform 0.2s var(--fs-ease);
}
.fs-skip:focus { transform: translateY(0); }

.fs-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(20, 24, 26, 0.94);
  border-bottom: 1px solid var(--fs-hairline);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.fs-header__bar { position: relative; }

.fs-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.75rem, 2vw, 2rem);
  width: min(var(--fs-max), 100% - (var(--fs-gutter) * 2));
  margin-inline: auto;
  min-height: var(--fs-header-h);
  transition: min-height 0.3s var(--fs-ease);
}

.fs-header[data-condensed] .fs-header__inner { min-height: 58px; }

/* 品牌 */
.fs-brand {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
}

.fs-brand__mark {
  flex: none;
  width: 9px;
  height: 34px;
  border-radius: 2px;
  background: repeating-linear-gradient(
    135deg,
    var(--fs-flame) 0 5px,
    var(--fs-gold) 5px 10px
  );
}

.fs-brand__text {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.fs-brand__name {
  font-size: 1.0625rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.2;
}

.fs-brand__tag {
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--fs-sage);
  line-height: 1.3;
  transition: opacity 0.25s var(--fs-ease);
}

.fs-header[data-condensed] .fs-brand__tag { opacity: 0; }
.fs-header[data-condensed] .fs-brand__mark { height: 26px; }

/* 命令栏导航 */
.fs-nav {
  flex: 1 1 auto;
  display: flex;
  justify-content: center;
  min-width: 0;
}

.fs-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.05rem, 0.7vw, 0.5rem);
}

.fs-nav__item { flex: none; }

.fs-nav__link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.42em;
  padding: 0.5rem 0.7rem;
  border-radius: var(--fs-radius);
  border-bottom: 2px solid transparent;
  color: rgba(244, 247, 246, 0.78);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1.4;
  transition: color 0.24s var(--fs-ease),
              background-color 0.24s var(--fs-ease),
              border-color 0.24s var(--fs-ease);
}

.fs-nav__link:hover {
  color: var(--fs-white);
  background: var(--fs-glass);
}

.fs-nav__index {
  font-family: var(--fs-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--fs-sage);
  transition: color 0.24s var(--fs-ease);
}

.fs-nav__link:hover .fs-nav__index { color: var(--fs-cyan); }

.fs-nav__link[aria-current="page"] {
  color: var(--fs-white);
  background: rgba(255, 90, 31, 0.1);
  border-bottom-color: var(--fs-flame);
}

.fs-nav__link[aria-current="page"] .fs-nav__index { color: var(--fs-flame); }

.fs-nav__foot {
  display: none;
  gap: 0.6rem;
  padding-top: 1.25rem;
}

/* 当前展区索引 */
.fs-rail {
  flex: none;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.75rem;
  color: var(--fs-sage);
  white-space: nowrap;
  opacity: 0.45;
  transition: opacity 0.3s var(--fs-ease);
}

.fs-header[data-condensed] .fs-rail { opacity: 1; }

.fs-rail__label { letter-spacing: 0.14em; }

.fs-rail__value {
  font-family: var(--fs-mono);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--fs-flame);
}

.fs-rail__name { color: var(--fs-white); }

/* 右侧入口 */
.fs-actions {
  flex: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* 移动目录按钮 */
.fs-nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.8rem;
  border: 1px solid var(--fs-glass-line);
  border-radius: var(--fs-radius);
  background: var(--fs-glass);
  color: var(--fs-white);
  font-size: 0.875rem;
  font-weight: 700;
}

.fs-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 12px;
}

.fs-nav-toggle__bars::before,
.fs-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--fs-flame);
  transition: transform 0.25s var(--fs-ease), top 0.25s var(--fs-ease);
}

.fs-nav-toggle__bars::before { top: 0; }
.fs-nav-toggle__bars::after { top: 10px; }
.fs-nav-toggle[aria-expanded="true"] .fs-nav-toggle__bars::before { top: 5px; transform: rotate(45deg); }
.fs-nav-toggle[aria-expanded="true"] .fs-nav-toggle__bars::after { top: 5px; transform: rotate(-45deg); }

/* 阅读进度 */
.fs-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
}

.fs-progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--fs-gold) 0%, var(--fs-flame) 100%);
}

/* ============================================================
   FOOTER
   ============================================================ */
.fs-footer {
  position: relative;
  background: var(--fs-charcoal);
  border-top: 1px solid var(--fs-hairline);
  padding-block: clamp(2.5rem, 6vw, 4.5rem) 1.5rem;
}

.fs-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: repeating-linear-gradient(
    90deg,
    var(--fs-flame) 0 28px,
    var(--fs-gold) 28px 56px,
    transparent 56px 88px
  );
  opacity: 0.85;
}

.fs-footer__inner {
  width: min(var(--fs-max), 100% - (var(--fs-gutter) * 2));
  margin-inline: auto;
}

.fs-footer__grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.3fr 1fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
}

.fs-footer__col--brand { max-width: 32ch; }

.fs-footer__brand {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.fs-footer__tag {
  margin-top: 0.35rem;
  color: var(--fs-flame);
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

.fs-footer__sig {
  margin-top: 0.9rem;
  color: var(--fs-sage);
  font-size: 0.8125rem;
  line-height: 1.75;
}

.fs-footer__title {
  margin-bottom: 1rem;
  color: var(--fs-sage);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.26em;
}

.fs-footer__list {
  display: grid;
  gap: 0.6rem;
  font-size: 0.9375rem;
}

.fs-footer__list a {
  color: rgba(244, 247, 246, 0.82);
  transition: color 0.2s var(--fs-ease);
}
.fs-footer__list a:hover { color: var(--fs-cyan); }

.fs-footer__contact {
  display: grid;
  gap: 0.8rem;
  font-size: 0.875rem;
}

.fs-footer__contact li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.6rem;
}

.fs-footer__key {
  flex: none;
  color: var(--fs-sage);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
}

.fs-footer__value {
  flex: 1 1 12ch;
  min-width: 0;
  color: rgba(244, 247, 246, 0.86);
  line-height: 1.65;
}

.fs-copy {
  flex: none;
  padding: 0.18em 0.65em;
  border: 1px solid var(--fs-glass-line);
  border-radius: 999px;
  color: var(--fs-sage);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  line-height: 1.6;
  transition: color 0.2s var(--fs-ease), border-color 0.2s var(--fs-ease);
}
.fs-copy:hover { color: var(--fs-cyan); border-color: var(--fs-cyan); }
.fs-copy[data-copied] { color: var(--fs-gold); border-color: var(--fs-gold); }

.fs-copy__status {
  flex: none;
  color: var(--fs-gold);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
}

.fs-footer__icp {
  margin-top: 1.1rem;
  color: rgba(168, 189, 180, 0.75);
  font-family: var(--fs-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}

.fs-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: clamp(2rem, 5vw, 3.5rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--fs-hairline);
}

.fs-footer__mood {
  color: var(--fs-sage);
  font-size: 0.875rem;
}

.fs-to-top {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.95rem;
  border: 1px solid var(--fs-glass-line);
  border-radius: 999px;
  background: var(--fs-glass);
  color: var(--fs-white);
  font-size: 0.8125rem;
  font-weight: 700;
  visibility: hidden;
  opacity: 0;
  transition: opacity 0.3s var(--fs-ease),
              visibility 0.3s var(--fs-ease),
              color 0.2s var(--fs-ease),
              border-color 0.2s var(--fs-ease);
}

.fs-to-top[data-shown] { visibility: visible; opacity: 1; }
.fs-to-top:hover { color: var(--fs-cyan); border-color: var(--fs-cyan); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .fs-rail { display: none; }
}

@media (max-width: 1024px) {
  html.fs-nav-open { overflow: hidden; }

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

  .fs-actions > .fs-btn { display: none; }

  .fs-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    padding: 0 var(--fs-gutter) 1.25rem;
    background: var(--fs-charcoal);
    border-bottom: 1px solid var(--fs-glass-line);
    max-height: calc(100vh - 58px);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s var(--fs-ease),
                transform 0.25s var(--fs-ease),
                visibility 0.25s var(--fs-ease);
  }

  .fs-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .fs-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .fs-nav__item { border-top: 1px solid var(--fs-hairline); }
  .fs-nav__item:first-child { border-top: 0; }

  .fs-nav__link {
    width: 100%;
    justify-content: space-between;
    padding: 0.95rem 0.25rem;
    border-bottom: 0;
    font-size: 1rem;
  }

  .fs-nav__link[aria-current="page"] {
    border-bottom-color: transparent;
    box-shadow: inset 3px 0 0 var(--fs-flame);
    padding-inline-start: 0.85rem;
  }

  .fs-nav__foot { display: flex; }
}

@media (max-width: 900px) {
  .fs-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .fs-grid--2,
  .fs-grid--3 { grid-template-columns: minmax(0, 1fr); }

  .fs-stairs__step:nth-child(even),
  .fs-stairs__step:nth-child(odd) { margin-inline: 0; }
}

@media (max-width: 640px) {
  html { scroll-padding-top: 84px; }

  .fs-brand__tag { display: none; }

  .fs-brand__mark { height: 26px; }

  .fs-header[data-condensed] .fs-brand__mark { height: 22px; }

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

  .fs-footer__bottom { flex-direction: column; align-items: flex-start; }

  .fs-scoreboard__row { flex-direction: column; gap: 0.5rem; }

  .fs-container,
  .fs-container--narrow,
  .fs-header__inner,
  .fs-footer__inner { width: min(var(--fs-max), 100% - 2rem); }
}

/* ============================================================
   无障碍降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .fs-js .fs-reveal {
    opacity: 1;
    transform: none;
  }

  .fs-nav { transition: none; }
}

@media (prefers-contrast: more) {
  :root {
    --fs-sage: #C6D8D0;
    --fs-glass-line: rgba(244, 247, 246, 0.34);
  }
}