/* =========================================================
   LOVE体育 — /assets/site.css
   01 变量 / 02 Reset / 03 基础排版 / 04 通用组件
   05 头部 / 06 关注抽屉 / 07 页脚 / 08 响应式 / 09 无障碍
   ========================================================= */

/* ---------- 01 变量 ---------- */
:root {
  --ink-900: #0B0D10;
  --ink-800: #151A20;
  --ink-700: #1B222A;
  --line: #2A313A;
  --fog: #F5F7FA;
  --white: #FFFFFF;
  --orange: #FF5A1F;
  --blue: #2D8CFF;
  --lime: #B6FF3B;
  --warm: #A8B0BB;
  --deep-orange: #8A2D0C;
  --ice: #9FD0FF;
  --alert: #FF3D5A;

  --font-display: "Inter", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", Consolas, "SFMono-Regular", Menlo, monospace;
  --font-serif: "Songti SC", "Noto Serif SC", Georgia, "Times New Roman", serif;

  --wrap: 1320px;
  --gap-1: 8px;
  --gap-2: 16px;
  --gap-3: 24px;
  --gap-4: 32px;
  --gap-5: 48px;
  --gap-6: 64px;
  --pad-inline: clamp(16px, 4vw, 32px);

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur-fast: 120ms;
  --dur-mid: 160ms;
  --dur-drawer: 180ms;
}

/* ---------- 02 Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 96px;
  scroll-behavior: smooth;
}

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

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

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

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

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

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

/* ---------- 03 基础排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(72% 46% at 88% -8%, rgba(255, 90, 31, 0.18), transparent 66%),
    radial-gradient(56% 40% at 0% 0%, rgba(45, 140, 255, 0.13), transparent 66%),
    linear-gradient(to right, rgba(42, 49, 58, 0.5) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 49, 58, 0.5) 1px, transparent 1px);
  background-size: auto, auto, 96px 96px, 96px 96px;
  background-repeat: no-repeat, no-repeat, repeat, repeat;
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.65;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.08;
  color: var(--white);
}

h1 { font-size: clamp(32px, 6vw, 56px); }
h2 { font-size: clamp(24px, 3.4vw, 40px); }
h3 { font-size: clamp(20px, 2.2vw, 28px); }
h4 { font-size: 18px; letter-spacing: 0; line-height: 1.35; }

p { line-height: 1.65; }

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

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

/* ---------- 04 通用组件 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad-inline);
}

.prose {
  max-width: 68ch;
  font-size: 17px;
  line-height: 1.7;
  color: var(--fog);
}
.prose p + p { margin-top: var(--gap-2); }
.prose h2 { margin-top: var(--gap-5); margin-bottom: var(--gap-2); }
.prose h3 { margin-top: var(--gap-4); margin-bottom: var(--gap-1); }
.prose ul { margin-top: var(--gap-2); display: flex; flex-direction: column; gap: 8px; }
.prose ul li { padding-left: 18px; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 1px;
  background: var(--orange);
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  min-height: 42px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: transparent;
  color: var(--fog);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  transition:
    background-color var(--dur-fast) var(--ease),
    border-color var(--dur-mid) var(--ease),
    color var(--dur-fast) var(--ease);
}

.btn--primary {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
}
.btn--primary:hover,
.btn--primary:focus-visible {
  background: #FF7440;
  border-color: #FF7440;
  color: var(--ink-900);
}

.btn--ghost { background: transparent; color: var(--fog); }
.btn--ghost:hover,
.btn--ghost:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
}
.btn--ghost[aria-pressed="true"] {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--ink-900);
}

/* 展签标签 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-800);
  color: var(--warm);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1.6;
  text-transform: uppercase;
}
.tag--orange {
  color: var(--orange);
  border-color: rgba(255, 90, 31, 0.45);
  background: rgba(255, 90, 31, 0.1);
}
.tag--blue {
  color: var(--blue);
  border-color: rgba(45, 140, 255, 0.4);
  background: rgba(45, 140, 255, 0.08);
}
.tag--lime {
  color: var(--lime);
  border-color: rgba(182, 255, 59, 0.4);
  background: rgba(182, 255, 59, 0.08);
}

/* 展览说明牌 */
.plate {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  background: var(--ink-800);
}
.plate__index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
  text-transform: uppercase;
}
.plate__title {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 15px;
  line-height: 1.5;
  color: var(--fog);
}

/* Bento 骨架 */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap-2);
}
.bento__cell {
  position: relative;
  grid-column: span 12;
  padding: var(--gap-3);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: 2px;
  transition:
    border-color var(--dur-mid) var(--ease),
    background-color var(--dur-fast) var(--ease);
}
.bento__cell:hover { border-color: var(--orange); }
.bento__cell--focus { grid-column: span 12; }

@media (min-width: 768px) {
  .bento { gap: var(--gap-3); }
  .bento__cell { grid-column: span 6; }
  .bento__cell--focus { grid-column: span 12; }
}
@media (min-width: 900px) {
  .bento__cell--focus { grid-column: span 7; }
}

/* 图片容器基础规则 */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--line);
  border-radius: 2px;
  background:
    repeating-linear-gradient(135deg, rgba(42, 49, 58, 0.75) 0 2px, transparent 2px 9px),
    var(--ink-800);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.08) saturate(1.05);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }

.media-frame__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 13, 16, 0.1) 0%, rgba(11, 13, 16, 0.85) 100%);
}
.media-frame__tag {
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  background: var(--orange);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.6;
  text-transform: uppercase;
}
.media-frame__caption {
  position: absolute;
  z-index: 2;
  left: 12px;
  right: 12px;
  bottom: 10px;
  font-size: 12px;
  line-height: 1.45;
  color: var(--fog);
}

/* 面包屑 */
.breadcrumb { margin-bottom: var(--gap-3); }
.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--warm);
}
.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--warm);
}
.breadcrumb__item[aria-current="page"] { color: var(--fog); }
.breadcrumb__link {
  border-bottom: 1px solid transparent;
  transition:
    color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease);
}
.breadcrumb__link:hover,
.breadcrumb__link:focus-visible {
  color: var(--orange);
  border-bottom-color: var(--orange);
}
.breadcrumb__sep { color: var(--line); }

/* ---------- 05 头部 ---------- */
.skip-link {
  position: fixed;
  top: -120px;
  left: 16px;
  z-index: 120;
  padding: 10px 18px;
  background: var(--orange);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 700;
  border-radius: 2px;
  transition: top var(--dur-mid) var(--ease);
}
.skip-link:focus,
.skip-link:focus-visible {
  top: 12px;
  outline: 2px solid var(--white);
  outline-offset: 2px;
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--orange) 0%, var(--blue) 62%, var(--lime) 100%);
  pointer-events: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(11, 13, 16, 0.94);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  gap: var(--gap-3);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 12px var(--pad-inline);
  min-height: 68px;
}

.brand {
  display: flex;
  flex-direction: column;
  gap: 1px;
  flex: 0 0 auto;
}
.brand__mark {
  display: inline-flex;
  align-items: baseline;
  transition: opacity var(--dur-fast) var(--ease);
}
.brand__mark:hover { opacity: 0.85; }
.brand__word {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-family: var(--font-display);
  font-size: 25px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--white);
}
.brand__accent {
  color: var(--orange);
  font-style: normal;
}
.brand__tagline {
  font-size: 11px;
  letter-spacing: 0.16em;
  line-height: 1.4;
  color: var(--warm);
}

.nav-toggle {
  display: none;
  flex: 0 0 auto;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 44px;
  height: 40px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-800);
  transition: border-color var(--dur-mid) var(--ease);
}
.nav-toggle:hover { border-color: var(--orange); }
.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--fog);
  transition:
    transform var(--dur-mid) var(--ease),
    opacity var(--dur-fast) var(--ease);
}
.nav-toggle__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.nav-toggle[aria-expanded="true"] { border-color: var(--orange); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

.site-nav { margin-left: auto; }
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 28px);
  flex-wrap: nowrap;
}
.site-nav__item { display: flex; }
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 6px 2px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  line-height: 1.4;
  color: var(--fog);
  white-space: nowrap;
  transition: color var(--dur-fast) var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-mid) var(--ease);
}
.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--white); }
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--orange); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.follow { flex: 0 0 auto; }
.follow__trigger {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  min-height: 40px;
  border: 1px solid var(--line);
  border-radius: 2px;
  background: var(--ink-800);
  color: var(--fog);
  transition:
    border-color var(--dur-mid) var(--ease),
    color var(--dur-fast) var(--ease),
    background-color var(--dur-fast) var(--ease);
}
.follow__trigger:hover,
.follow__trigger:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
}
.follow__trigger[aria-expanded="true"] {
  border-color: var(--orange);
  background: var(--ink-700);
  color: var(--orange);
}
.follow__count {
  display: inline-grid;
  place-items: center;
  min-width: 22px;
  height: 20px;
  padding: 0 5px;
  border-radius: 2px;
  background: var(--lime);
  color: var(--ink-900);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  line-height: 1;
}
.follow__text {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

/* ---------- 06 关注抽屉 ---------- */
.follow-drawer {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 95;
  display: flex;
  flex-direction: column;
  width: min(380px, 92vw);
  height: 100%;
  overflow: hidden;
  background: var(--ink-800);
  border-left: 1px solid var(--line);
  box-shadow: -30px 0 80px rgba(0, 0, 0, 0.55);
  transform: translateX(103%);
  transition: transform var(--dur-drawer) var(--ease);
}
.follow-drawer[hidden] { display: none; }
.follow-drawer[data-open] { transform: translateX(0); }

.follow-drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-2);
  padding: 18px 20px;
  background: var(--ink-900);
  border-bottom: 1px solid var(--line);
}
.follow-drawer__title {
  font-size: 20px;
  letter-spacing: -0.01em;
}
.follow-drawer__close {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--warm);
  font-size: 20px;
  line-height: 1;
  transition:
    border-color var(--dur-mid) var(--ease),
    color var(--dur-fast) var(--ease);
}
.follow-drawer__close:hover,
.follow-drawer__close:focus-visible {
  border-color: var(--orange);
  color: var(--orange);
}
.follow-drawer__hint {
  padding: 12px 20px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--warm);
  border-bottom: 1px solid var(--line);
}
.follow-drawer__body {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 4px 20px 20px;
  overscroll-behavior: contain;
}
.follow-group { padding-top: 16px; }
.follow-group__title {
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--blue);
}
.follow-item {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  grid-template-rows: auto auto;
  column-gap: 10px;
  align-items: center;
  padding: 10px 2px;
  border-bottom: 1px dashed var(--line);
  cursor: pointer;
  transition: background-color var(--dur-fast) var(--ease);
}
.follow-item:hover { background: rgba(255, 90, 31, 0.06); }
.follow-item__input {
  grid-row: 1 / span 2;
  width: 16px;
  height: 16px;
  margin: 0;
  accent-color: var(--orange);
  cursor: pointer;
}
.follow-item__name {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--fog);
  transition: color var(--dur-fast) var(--ease);
}
.follow-item__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.4;
  color: var(--warm);
}
.follow-item__input:checked ~ .follow-item__name { color: var(--orange); }
.follow-drawer__foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-2);
  padding: 14px 20px;
  background: var(--ink-900);
  border-top: 1px solid var(--line);
}
.follow-drawer__count {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--lime);
}
.follow-drawer__link {
  font-size: 13px;
  font-weight: 700;
  color: var(--blue);
  border-bottom: 1px solid transparent;
  transition:
    color var(--dur-fast) var(--ease),
    border-color var(--dur-fast) var(--ease);
}
.follow-drawer__link:hover,
.follow-drawer__link:focus-visible {
  color: var(--ice);
  border-bottom-color: var(--ice);
}

/* ---------- 07 页脚 ---------- */
.site-footer {
  margin-top: var(--gap-6);
  background: var(--ink-900);
  border-top: 1px solid var(--line);
}

.action-strip {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--gap-2);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 16px var(--pad-inline);
  border-bottom: 1px solid var(--line);
  background-image: linear-gradient(90deg, rgba(255, 90, 31, 0.12), rgba(255, 90, 31, 0) 62%);
}
.action-strip__text {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--fog);
}
.action-strip__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}
.action-strip__actions .btn { min-width: 104px; }

.site-footer__inner {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
  gap: var(--gap-4);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: var(--gap-5) var(--pad-inline) var(--gap-4);
}

.site-footer__col {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
}

.site-footer__brand {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--white);
}
.site-footer__slogan {
  font-size: 14px;
  line-height: 1.6;
  color: var(--warm);
  max-width: 24ch;
}
.site-footer__legal {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--warm);
}

.site-footer__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
  line-height: 1.6;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 9px;
}
.footer-links a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  line-height: 1.5;
  color: var(--warm);
  transition: color var(--dur-fast) var(--ease);
}
.footer-links a::before {
  content: "";
  width: 8px;
  height: 1px;
  background: currentColor;
  opacity: 0.55;
  transition: width var(--dur-mid) var(--ease);
}
.footer-links a:hover,
.footer-links a:focus-visible { color: var(--orange); }
.footer-links a:hover::before,
.footer-links a:focus-visible::before { width: 16px; }

.contact-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.contact-list__item {
  display: flex;
  gap: 10px;
  align-items: baseline;
  min-width: 0;
}
.contact-list__label {
  flex: 0 0 38px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--warm);
  text-transform: uppercase;
}
.contact-list__value {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--fog);
  overflow-wrap: anywhere;
}

.site-footer__note {
  margin-top: 6px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--warm);
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 14px var(--pad-inline) var(--gap-4);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--warm);
}

/* ---------- 08 响应式 ---------- */
@media (max-width: 1080px) {
  .site-header__inner {
    flex-wrap: wrap;
    gap: 10px var(--gap-2);
    padding-block: 10px;
  }
  .brand { order: 1; }
  .follow { order: 2; margin-left: auto; }
  .nav-toggle { order: 3; display: flex; }
  .site-nav {
    order: 4;
    flex: 1 1 100%;
    margin-left: 0;
    max-height: 0;
    overflow: hidden;
    border-top: 1px solid transparent;
    transition:
      max-height 220ms var(--ease),
      border-color var(--dur-mid) var(--ease);
  }
  .site-nav[data-open] {
    max-height: 420px;
    border-top-color: var(--line);
  }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding-block: 4px 8px;
  }
  .site-nav__item {
    border-bottom: 1px solid var(--line);
  }
  .site-nav__item:last-child { border-bottom: 0; }
  .site-nav__link {
    display: block;
    padding: 12px 4px;
    font-size: 15px;
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] {
    padding-left: 12px;
    box-shadow: inset 3px 0 0 var(--orange);
  }
}

@media (max-width: 900px) {
  .site-footer__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-3);
  }
  .site-footer__slogan { max-width: none; }
}

@media (max-width: 640px) {
  body { font-size: 15.5px; }
  .brand__word { font-size: 21px; }
  .brand__tagline { font-size: 10px; letter-spacing: 0.1em; }
  .follow__text {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
  }
  .follow__trigger { padding: 8px 10px; }
  .action-strip { padding-block: 14px; }
  .action-strip__actions { width: 100%; }
  .action-strip__actions .btn { flex: 1 1 0; min-width: 0; }
  .site-footer__inner {
    grid-template-columns: 1fr;
    padding-top: var(--gap-4);
  }
  .site-footer__base {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
  .follow-drawer__title { font-size: 18px; }
}

/* ---------- 09 无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
.site-nav__link:focus-visible { outline-offset: 4px; }
.follow__trigger:focus-visible,
.nav-toggle:focus-visible { outline-offset: 3px; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}