/* =========================================================
   悦盈体育 · 全站共享样式  /assets/site.css
   深夜墨绿底 · 荧光青状态 · 切角与斜线 · 等宽数据感
   ========================================================= */

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

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

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

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

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

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

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

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

[hidden] { display: none !important; }

/* ---------- 2. 变量 ---------- */
:root {
  color-scheme: dark;

  /* 色板 */
  --ink-0: #0A1D18;
  --ink-1: #123328;
  --cream: #F4EFE3;
  --cyan: #35F0C8;
  --orange: #FF8A3D;
  --purple: #8A5CFF;
  --line: #255043;
  --orange-soft: #FFB37A;
  --alert: #FF5A3C;
  --cyan-mist: rgba(53, 240, 200, 0.12);
  --cream-dim: rgba(244, 239, 227, 0.68);
  --cream-faint: rgba(244, 239, 227, 0.44);
  --ink-deep: #061410;
  --on-orange: #17100A;

  /* 字体 */
  --font-head: "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-body: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  /* 字号 */
  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-base: 1rem;
  --fs-md: 1.125rem;
  --fs-lg: 1.375rem;
  --fs-xl: 1.75rem;

  /* 间距 */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 20px;
  --sp-6: 28px;
  --sp-7: 40px;
  --sp-8: 56px;
  --sp-9: 80px;
  --sp-10: 112px;

  /* 布局 */
  --shell: 1320px;
  --gutter: 20px;

  /* 切角 */
  --cut-sm: 9px;
  --cut-md: 20px;
  --cut-lg: 34px;
}

@media (min-width: 900px) {
  :root {
    --gutter: 32px;
    --fs-base: 1.0625rem;
    --fs-lg: 1.5rem;
    --fs-xl: 2.125rem;
  }
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  background-color: var(--ink-0);
  color: var(--cream);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  font-weight: 400;
  line-height: 1.8;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

::selection {
  background: var(--cyan);
  color: var(--ink-0);
}

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

#main-content,
[id] { scroll-margin-top: 108px; }

/* ---------- 4. 布局容器 ---------- */
.shell {
  width: min(100% - (2 * var(--gutter)), var(--shell));
  margin-inline: auto;
}

.section {
  position: relative;
  padding-block: var(--sp-8);
}

@media (min-width: 900px) {
  .section { padding-block: var(--sp-10); }
}

.section--tight { padding-block: var(--sp-6); }

.section--slope {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

.section--slope::before {
  content: "";
  position: absolute;
  inset: -3vw 0;
  z-index: -1;
  background-color: var(--ink-1);
  transform: skewY(-1.6deg);
}

.speed-line {
  height: 1px;
  width: min(100%, 240px);
  background: linear-gradient(90deg, var(--cyan), rgba(53, 240, 200, 0));
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--sp-6);
}

.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .grid-12 > * { grid-column: 1 / -1; }
}

/* ---------- 5. 排版组件 ---------- */
.display-1,
.display-2,
.display-3 {
  font-family: var(--font-head);
  font-weight: 900;
  color: var(--cream);
  letter-spacing: -0.02em;
  line-height: 1.02;
  transform: scaleX(1.02);
  transform-origin: left center;
}

.display-1 { font-size: clamp(2.25rem, 7vw, 4.5rem); line-height: 0.98; }
.display-2 { font-size: clamp(1.75rem, 4.4vw, 2.75rem); }
.display-3 { font-size: clamp(1.25rem, 2.6vw, 1.75rem); }

.lede {
  max-width: 38ch;
  font-size: var(--fs-md);
  line-height: 1.78;
  color: var(--cream-dim);
}

.prose {
  max-width: 36em;
  color: var(--cream-dim);
  line-height: 1.82;
}

.prose p + p { margin-top: var(--sp-4); }
.prose strong { color: var(--cream); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section-index {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: 100%;
  font-family: var(--font-mono);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.section-index::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line);
}

.data-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
  letter-spacing: 0;
}

/* ---------- 6. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 10px 18px;
  font-family: var(--font-body);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.4;
  color: var(--cream);
  background-color: var(--ink-1);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.btn:hover,
.btn:focus-visible {
  background-color: var(--cyan-mist);
  border-color: var(--cyan);
  color: var(--cyan);
}

.btn--cta {
  background-color: var(--orange);
  border-color: var(--orange);
  color: var(--on-orange);
  font-weight: 800;
}

.btn--cta:hover,
.btn--cta:focus-visible {
  background-color: var(--orange-soft);
  border-color: var(--orange-soft);
  color: var(--on-orange);
}

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

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background-color: var(--cyan-mist);
  color: var(--cyan);
}

.btn--mini {
  padding: 6px 12px;
  font-size: var(--fs-xs);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--cream-dim);
  border: 1px solid var(--line);
  background-color: rgba(255, 255, 255, 0.02);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 7px 100%, 0 calc(100% - 7px));
}

.tag--live {
  color: var(--cyan);
  border-color: var(--cyan);
  background-color: var(--cyan-mist);
}

.tag--version {
  color: var(--purple);
  border-color: var(--purple);
}

.tag--alert {
  color: var(--alert);
  border-color: var(--alert);
}

.tag--soft {
  color: var(--cream-faint);
}

/* ---------- 7. 面板 / 折叠 / 卡片流 ---------- */
.panel {
  position: relative;
  background-color: var(--ink-1);
  border: 1px solid var(--line);
  padding: var(--sp-6);
}

.panel--cut {
  border-color: var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-md)), calc(100% - var(--cut-md)) 100%, 0 100%);
}

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-3);
  justify-content: space-between;
  margin-bottom: var(--sp-4);
}

.panel__body { color: var(--cream-dim); }
.panel__body p + p { margin-top: var(--sp-3); }

.accordion { border-top: 1px solid var(--line); }

.accordion__item { border-bottom: 1px solid var(--line); }

.accordion__trigger {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: 100%;
  padding: 18px 4px;
  text-align: left;
  font-family: var(--font-head);
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.accordion__trigger::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--cyan);
  transition: transform 0.18s ease;
}

.accordion__item[data-open] .accordion__trigger::after {
  content: "–";
  transform: rotate(180deg);
}

.accordion__panel {
  display: none;
  padding: 0 4px var(--sp-6);
  color: var(--cream-dim);
}

.accordion__item[data-open] .accordion__panel { display: block; }

.card-rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(258px, 320px);
  gap: var(--sp-5);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--line) transparent;
  padding-bottom: var(--sp-4);
}

.card-rail__item { scroll-snap-align: start; }

.card-rail::-webkit-scrollbar { height: 6px; }
.card-rail::-webkit-scrollbar-track { background: transparent; }
.card-rail::-webkit-scrollbar-thumb { background: var(--line); }

/* ---------- 8. 数据 / 筛选 / 面包屑 ---------- */
.stat {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: var(--sp-3);
  border-left: 2px solid var(--cyan);
}

.stat__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cream);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cream-faint);
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
}

.filter-chip {
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cream-dim);
  border: 1px solid var(--line);
  background-color: transparent;
  transition: color 0.14s ease, border-color 0.14s ease, background-color 0.14s ease;
}

.filter-chip:hover { color: var(--cream); border-color: var(--cyan); }

.filter-chip[aria-pressed="true"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background-color: var(--cyan-mist);
}

.breadcrumb { font-size: var(--fs-sm); }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--sp-2);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--cream-faint);
}

.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: var(--sp-2);
  color: var(--line);
}

.breadcrumb__link { color: var(--cream-dim); }
.breadcrumb__link:hover { color: var(--cyan); }

/* ---------- 9. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--ink-1);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut-md)), calc(100% - var(--cut-md)) 100%, 0 100%);
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.9);
}

.media-frame__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 29, 24, 0.15) 0%, rgba(10, 29, 24, 0.82) 100%);
  pointer-events: none;
}

/* ---------- 10. 显现动效 ---------- */
.reveal { opacity: 1; transform: none; }

html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.44s ease, transform 0.44s ease;
}

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

/* ---------- 11. Skip link ---------- */
.skip-link {
  position: absolute;
  left: var(--sp-4);
  top: -60px;
  z-index: 200;
  padding: 10px 16px;
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--ink-0);
  background-color: var(--cyan);
  transition: top 0.18s ease;
}

.skip-link:focus {
  top: var(--sp-4);
  color: var(--ink-0);
}

/* =========================================================
   12. 页头
   ========================================================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: var(--ink-0);
  border-bottom: 1px solid var(--line);
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0;
  height: 2px;
  z-index: 4;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--purple) 58%, var(--orange) 100%);
}

.command-bar__inner {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--sp-3) var(--sp-6);
  width: min(100% - (2 * var(--gutter)), var(--shell));
  margin-inline: auto;
  padding-block: 10px 8px;
}

/* 品牌 */
.brand {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1px;
  padding-left: 14px;
  line-height: 1.18;
}

.brand::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  bottom: 3px;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--purple) 100%);
}

.brand__mark {
  display: inline-block;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.15rem;
  letter-spacing: 0.05em;
  color: var(--cream);
  transform: scaleX(1.03);
  transform-origin: left center;
}

.brand__line {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--cream-faint);
  white-space: nowrap;
}

/* 导航 */
.primary-nav { justify-self: end; }

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
  counter-reset: nav;
}

.primary-nav__item { counter-increment: nav; }

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 6px 10px 7px;
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cream-dim);
  border-bottom: 2px solid transparent;
  transition: color 0.16s ease, background-color 0.16s ease, border-color 0.16s ease;
}

.primary-nav__link::before {
  content: counter(nav, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0;
  color: var(--cyan);
  opacity: 0.5;
  transition: opacity 0.16s ease;
}

.primary-nav__link:hover {
  color: var(--cream);
  background-color: var(--cyan-mist);
}

.primary-nav__link[aria-current="page"] {
  color: var(--cyan);
  background-color: var(--cyan-mist);
  border-bottom-color: var(--cyan);
}

.primary-nav__link[aria-current="page"]::before { opacity: 1; }

.primary-nav__link[aria-current="page"]::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 10px;
  width: 4px;
  height: 4px;
  background-color: var(--cyan);
}

/* 行动区与菜单按钮 */
.command-bar__actions { justify-self: end; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--sp-2);
  padding: 9px 12px;
  border: 1px solid var(--line);
  color: var(--cream);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  transition: border-color 0.16s ease, color 0.16s ease;
}

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

.nav-toggle__glyph {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__glyph::before,
.nav-toggle__glyph::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--cyan);
  transition: transform 0.18s ease;
}

.nav-toggle__glyph::before { top: 0; }
.nav-toggle__glyph::after { top: 8px; }

.site-header[data-open] .nav-toggle__glyph::before { transform: translateY(4px) rotate(45deg); }
.site-header[data-open] .nav-toggle__glyph::after { transform: translateY(-4px) rotate(-45deg); }

/* 状态条 */
.status-strip {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  width: min(100% - (2 * var(--gutter)), var(--shell));
  margin-inline: auto;
  padding: 7px 0 8px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cream-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.status-strip__dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background-color: var(--cyan);
  animation: status-pulse 2.4s ease-out infinite;
}

.status-strip__text {
  overflow: hidden;
  text-overflow: ellipsis;
}

@keyframes status-pulse {
  0% { box-shadow: 0 0 0 0 rgba(53, 240, 200, 0.5); }
  70% { box-shadow: 0 0 0 7px rgba(53, 240, 200, 0); }
  100% { box-shadow: 0 0 0 0 rgba(53, 240, 200, 0); }
}

/* 平板与手机：导航折叠 */
@media (max-width: 1080px) {
  .primary-nav__link { padding: 6px 7px; font-size: 0.8125rem; }
  .brand__line { display: none; }
}

@media (max-width: 960px) {
  .command-bar__inner {
    grid-template-columns: minmax(0, 1fr) auto auto;
    gap: var(--sp-3);
  }

  .brand { grid-column: 1; grid-row: 1; min-width: 0; }
  .command-bar__actions { grid-column: 2; grid-row: 1; align-self: center; }
  .nav-toggle { grid-column: 3; grid-row: 1; display: inline-flex; }

  .primary-nav {
    grid-column: 1 / -1;
    grid-row: 2;
    justify-self: stretch;
    display: none;
    padding-top: var(--sp-3);
    border-top: 1px dashed var(--line);
  }

  .site-header[data-open] .primary-nav { display: block; }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .primary-nav__link {
    width: 100%;
    padding: 12px 12px;
    font-size: var(--fs-base);
    border-bottom: 0;
    border-left: 2px solid transparent;
  }

  .primary-nav__link[aria-current="page"] {
    border-bottom-color: transparent;
    border-left-color: var(--cyan);
  }

  .primary-nav__link[aria-current="page"]::after { display: none; }

  .btn--cta { padding: 8px 12px; font-size: var(--fs-xs); }
}

@media (max-width: 520px) {
  .brand__mark { font-size: 1rem; }
  .nav-toggle__text { display: none; }
  .status-strip { font-size: 10px; }
}

/* =========================================================
   13. 页脚
   ========================================================= */
.site-footer {
  position: relative;
  margin-top: var(--sp-9);
  background-color: var(--ink-deep);
}

.footer-speedline {
  height: 3px;
  background: linear-gradient(
    90deg,
    rgba(53, 240, 200, 0) 0%,
    var(--cyan) 18%,
    var(--purple) 48%,
    var(--orange) 76%,
    rgba(255, 138, 61, 0) 100%
  );
  opacity: 0.9;
}

.site-footer__inner {
  width: min(100% - (2 * var(--gutter)), var(--shell));
  margin-inline: auto;
  padding-block: var(--sp-8) var(--sp-6);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) minmax(0, 2.6fr);
  gap: var(--sp-7) var(--sp-8);
  padding-bottom: var(--sp-7);
}

.footer-brand { position: relative; }

.footer-brand__mark {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 1.4rem;
  letter-spacing: 0.05em;
  color: var(--cream);
  transform: scaleX(1.02);
  transform-origin: left center;
}

.footer-brand__line {
  margin-top: var(--sp-2);
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--cream-dim);
}

.footer-brand__tag {
  margin-top: var(--sp-4);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--sp-6) var(--sp-5);
}

.footer-col__title {
  margin-bottom: var(--sp-4);
  padding-left: 10px;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}

.footer-col__list { display: flex; flex-direction: column; gap: 2px; }

.footer-link {
  display: inline-block;
  font-size: var(--fs-sm);
  line-height: 1.85;
  color: var(--cream-dim);
  transition: color 0.16s ease, transform 0.16s ease;
}

.footer-link--mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.03em;
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--cyan);
  transform: translateX(3px);
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-2) var(--sp-6);
  padding-top: var(--sp-5);
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--cream-faint);
}

.footer-legal { max-width: 62ch; }

.footer-copy { white-space: nowrap; }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: var(--gutter);
  z-index: 80;
  padding: 9px 15px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  background-color: var(--ink-1);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s ease,
    border-color 0.16s ease, background-color 0.16s ease;
}

.to-top[data-visible] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.to-top:hover {
  border-color: var(--cyan);
  background-color: var(--cyan-mist);
}

@media (max-width: 900px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: var(--sp-7); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 560px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); gap: var(--sp-6); }
  .footer-meta { flex-direction: column; align-items: flex-start; }
}

/* =========================================================
   14. 无障碍与降级
   ========================================================= */
@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;
  }

  html.js .reveal {
    opacity: 1;
    transform: none;
  }

  .status-strip__dot { animation: none; }
}

@media print {
  .site-header,
  .site-footer,
  .to-top { display: none; }
}