/* =========================================================
   火狐体育主站 · 共享样式表 /assets/site.css
   设计语言：深夜赛场控制室（炭黑场域 + 熔岩橙锚点 + 等宽仪表盘）
   ========================================================= */

/* ---------- 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, figure, blockquote, dl, dd { margin: 0; }

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

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

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

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

a { color: inherit; }

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

/* ---------- 2. 设计变量 ---------- */
:root {
  --lava: #FF4A17;
  --lava-deep: #C93A0F;
  --ink: #0E0F11;
  --graphite: #1B1D21;
  --line: #2A2D33;
  --mist: #9AA1AC;
  --cream: #F4F1EA;
  --cyan: #1FE0D0;
  --lime: #B6FF3C;
  --amber: #FFB020;
  --ink-soft: #3B3D42;

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono", "Courier New", monospace;

  --wrap: 1220px;
  --wrap-narrow: 34em;
  --wrap-mid: 56em;
  --gutter: clamp(1rem, 4vw, 3rem);

  --r-xl: 32px;
  --r-lg: 22px;
  --r-md: 14px;
  --r-sm: 9px;

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

/* ---------- 3. 中文排版与场域底色 ---------- */
body {
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(46rem 34rem at 88% -12%, rgba(255, 74, 23, .18), transparent 64%),
    radial-gradient(38rem 30rem at -8% 34%, rgba(31, 224, 208, .07), transparent 62%),
    repeating-linear-gradient(0deg, rgba(244, 241, 234, .022) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(90deg, rgba(244, 241, 234, .022) 0 1px, transparent 1px 72px);
  color: var(--mist);
  font-family: var(--font-sans);
  font-size: clamp(1rem, .35vw + .92rem, 1.075rem);
  line-height: 1.75;
  letter-spacing: .012em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  color: var(--cream);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -.02em;
}

h1 { font-size: clamp(2.6rem, 7vw, 5.4rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: clamp(1.18rem, 1.8vw, 1.5rem); letter-spacing: -.01em; }

p { max-width: 62ch; }

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

code, kbd, samp { font-family: var(--font-mono); }

::selection { background: var(--lava); color: #fff; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

#main-content { scroll-margin-top: 6.5rem; }

/* ---------- 4. 版宽与网格 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--narrow { max-width: var(--wrap-narrow); }
.wrap--mid { max-width: var(--wrap-mid); }

.section {
  position: relative;
  padding-block: clamp(3rem, 7vw, 6rem);
}

.section--invert {
  background: var(--cream);
  color: var(--ink-soft);
}

.section--invert h1,
.section--invert h2,
.section--invert h3,
.section--invert h4 { color: var(--ink); }

.grid { display: grid; gap: clamp(1rem, 2.4vw, 2rem); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr)); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }

/* ---------- 5. 板块头 / 眉标 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: .5rem 1rem;
  margin-bottom: clamp(1.2rem, 3vw, 2.2rem);
}

.section-head h2 { flex: 1 1 18rem; }

.section-num {
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .2em;
  color: var(--lava);
}

.kicker {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--cyan);
}

.section--invert .section-num { color: var(--lava-deep); }
.section--invert .kicker { color: #0E8C82; }

/* ---------- 6. 按钮 / 链接 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .8rem 1.5rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .02em;
  text-decoration: none;
  transition: background-color .2s var(--ease), border-color .2s var(--ease), color .2s var(--ease), transform .2s var(--ease);
}

.btn--primary { background: var(--lava); color: #fff; }
.btn--primary:hover,
.btn--primary:focus-visible { background: var(--lava-deep); transform: translateY(-1px); }

.btn--ghost { border-color: var(--line); color: var(--cream); }
.btn--ghost:hover,
.btn--ghost:focus-visible { border-color: var(--lava); color: var(--lava); }

.mono-tag {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .1em;
  color: var(--mist);
  white-space: nowrap;
}

.ghost-link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--cream);
  text-decoration: none;
}

.ghost-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--lava);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s var(--ease);
}

.ghost-link:hover::after,
.ghost-link:focus-visible::after { transform: scaleX(1); }

/* ---------- 7. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0 0 1.5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.crumbs li { display: inline-flex; align-items: center; gap: .45rem; }

.crumbs li + li::before {
  content: "/";
  color: var(--line);
}

.crumbs a { text-decoration: none; transition: color .2s var(--ease); }
.crumbs a:hover, .crumbs a:focus-visible { color: var(--lava); }

/* ---------- 8. 卡片 / 数据 / 状态 ---------- */
.card {
  position: relative;
  padding: 1.4rem 1.5rem 1.5rem;
  background: var(--graphite);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  transition: background-color .24s var(--ease), border-color .24s var(--ease), transform .24s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.4rem;
  bottom: 1.4rem;
  width: 3px;
  border-radius: 3px;
  background: var(--lava);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform .24s var(--ease);
}

.card:hover,
.card:focus-within {
  background: var(--lava-deep);
  border-color: var(--lava);
}

.card:hover::before,
.card:focus-within::before { transform: scaleY(1); }

.card__title {
  margin-bottom: .5rem;
  font-size: 1.12rem;
  font-weight: 800;
  color: var(--cream);
}

.card:hover .card__title,
.card:focus-within .card__title { color: #fff; }

.card__body { font-size: .95rem; }
.card:hover .card__body,
.card:focus-within .card__body { color: #FFE7DE; }

.data-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: .68rem 0;
  border-bottom: 1px dashed var(--line);
  font-family: var(--font-mono);
  font-size: .84rem;
  letter-spacing: .02em;
}

.data-row__k { color: var(--mist); }
.data-row__v { color: var(--cream); }

.stat { display: flex; flex-direction: column; gap: .3rem; }

.stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cream);
}

.stat__label {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .14em;
  color: var(--mist);
}

.section--invert .stat__num { color: var(--ink); }
.section--invert .stat__label { color: #6E727A; }

.pill {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .2rem .65rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--mist);
  white-space: nowrap;
}

.pill::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  flex: none;
}

.pill--ok { color: var(--lime); border-color: rgba(182, 255, 60, .35); }
.pill--wait { color: var(--amber); border-color: rgba(255, 176, 32, .35); }
.pill--live { color: var(--cyan); border-color: rgba(31, 224, 208, .35); }

.note {
  padding: .35rem 0 .35rem 1rem;
  border-left: 3px solid var(--lava);
  font-size: .93rem;
}

/* ---------- 9. 图片容器（页面阶段放置图片 / 占位） ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background-color: var(--graphite);
  background-image:
    linear-gradient(155deg, rgba(255, 74, 23, .18), rgba(27, 29, 33, .92) 58%),
    repeating-linear-gradient(135deg, rgba(244, 241, 234, .035) 0 2px, transparent 2px 9px);
}

.media::before { content: ""; display: block; padding-top: 56.25%; }
.media--4x3::before { padding-top: 75%; }
.media--1x1::before { padding-top: 100%; }
.media--21x9::before { padding-top: 42.86%; }
.media--tall::before { padding-top: 122%; }

.media > img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media__caption {
  position: relative;
  margin-top: .6rem;
  padding-left: .95rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.media__caption::before {
  content: "";
  position: absolute;
  left: 0;
  top: .6em;
  width: 7px;
  height: 2px;
  background: var(--lava);
}

/* ---------- 10. 标签切换 / 核验清单 / 章节刻度 ---------- */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-bottom: 1.3rem;
}

.tab {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .48rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--mist);
  transition: background-color .2s var(--ease), color .2s var(--ease), border-color .2s var(--ease);
}

.tab:hover { color: var(--cream); border-color: var(--mist); }

.tab[aria-selected="true"] {
  background: var(--lava);
  border-color: var(--lava);
  color: #fff;
}

.panel[hidden] { display: none; }

.checklist { display: grid; gap: .5rem; }

.checklist__item {
  display: flex;
  align-items: flex-start;
  gap: .8rem;
  padding: .8rem 1rem;
  background: var(--graphite);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  transition: border-color .2s var(--ease);
}

.checklist__item.is-done { border-color: rgba(182, 255, 60, .42); }

.checklist__tick {
  position: relative;
  flex: none;
  width: 1.15rem;
  height: 1.15rem;
  margin-top: .28rem;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: transparent;
  transition: background-color .2s var(--ease), border-color .2s var(--ease);
}

.checklist__tick[aria-checked="true"] {
  background: var(--lime);
  border-color: var(--lime);
}

.checklist__tick[aria-checked="true"]::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 2px;
  width: 5px;
  height: 10px;
  border: solid var(--ink);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

.checklist__text { font-size: .94rem; }
.checklist__item.is-done .checklist__text { color: var(--cream); }

.progress {
  height: 6px;
  border-radius: 999px;
  background: var(--line);
  overflow: hidden;
}

.progress__bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--lava), var(--amber));
  transition: width .24s var(--ease);
}

.anchor-rail {
  position: sticky;
  top: 9rem;
  display: flex;
  flex-direction: column;
  gap: .5rem;
  font-family: var(--font-mono);
  font-size: .72rem;
}

.anchor-rail__link {
  position: relative;
  padding-left: .85rem;
  color: var(--mist);
  text-decoration: none;
  letter-spacing: .08em;
  transition: color .2s var(--ease);
}

.anchor-rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--line);
  transform: translateY(-50%);
  transition: background-color .2s var(--ease);
}

.anchor-rail__link.is-current { color: var(--lava); }
.anchor-rail__link.is-current::before { background: var(--lava); }

/* ---------- 11. 显现动效 ---------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity .16s var(--ease), transform .16s var(--ease);
}

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

/* ---------- 12. 页头 ---------- */
.skip-link {
  position: fixed;
  top: .6rem;
  left: .6rem;
  z-index: 200;
  padding: .6rem 1.1rem;
  border-radius: 999px;
  background: var(--lava);
  color: #fff;
  font-weight: 700;
  font-size: .85rem;
  text-decoration: none;
  transform: translateY(-260%);
  transition: transform .2s var(--ease);
}

.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(14, 15, 17, .94);
  border-bottom: 1px solid rgba(42, 45, 51, .9);
  -webkit-backdrop-filter: blur(12px) saturate(1.15);
  backdrop-filter: blur(12px) saturate(1.15);
}

.scroll-meter {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 3;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--lava), var(--amber));
  transform: scaleX(0);
  transform-origin: left;
}

.masthead {
  position: relative;
  border-bottom: 1px solid var(--line);
}

.masthead::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -1px;
  width: 64px;
  height: 2px;
  background: var(--lava);
  transform: translateX(-50%);
}

.masthead__inner {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: .75rem 2rem;
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(.8rem, 1.6vw, 1.25rem) var(--gutter);
  transition: padding .2s var(--ease);
}

.masthead__aside {
  display: flex;
  align-items: center;
  gap: 1rem;
  justify-self: end;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: .7rem;
  justify-self: center;
  text-decoration: none;
}

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: clamp(2.1rem, 3.4vw, 2.7rem);
  height: clamp(2.1rem, 3.4vw, 2.7rem);
  border-radius: 16px 5px 16px 5px;
  background: linear-gradient(150deg, var(--lava), var(--lava-deep));
  color: #fff;
  font-weight: 900;
  font-size: clamp(.95rem, 1.5vw, 1.15rem);
  line-height: 1;
  transition: width .2s var(--ease), height .2s var(--ease);
}

.brand__text { display: flex; flex-direction: column; line-height: 1.15; }

.brand__name {
  color: var(--cream);
  font-weight: 900;
  font-size: clamp(1.35rem, 3vw, 2rem);
  letter-spacing: -.03em;
  transition: font-size .2s var(--ease);
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: .64rem;
  letter-spacing: .2em;
  color: var(--mist);
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  justify-self: start;
  padding: .3rem .8rem;
  background: rgba(27, 29, 33, .7);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.status-pill__dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--lime);
  animation: pulse 1.6s ease-in-out infinite;
}

.status-pill__label { color: var(--cream); }

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(182, 255, 60, .55); opacity: 1; }
  50% { box-shadow: 0 0 0 6px rgba(182, 255, 60, 0); opacity: .7; }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: .55rem;
  justify-self: end;
  padding: .5rem .85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--cream);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

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

.nav-toggle__bars {
  position: relative;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background-color .2s var(--ease);
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .2s var(--ease);
}

.nav-toggle__bars::before { top: -5px; }
.nav-toggle__bars::after { top: 5px; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-5px) rotate(-45deg); }

.site-nav {
  border-bottom: 1px solid var(--line);
  background: transparent;
}

.site-nav__inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: clamp(.9rem, 3vw, 2.6rem);
  padding-block: .8rem;
}

.site-nav__link {
  position: relative;
  display: inline-block;
  padding: .35rem .1rem;
  font-weight: 700;
  font-size: clamp(.92rem, 1vw, 1rem);
  letter-spacing: .02em;
  color: var(--mist);
  text-decoration: none;
  transition: color .2s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 2px;
  background: var(--lava);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s var(--ease);
}

.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--cream); }

.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--cream); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.subnav {
  background: rgba(27, 29, 33, .72);
  border-top: 1px solid var(--line);
}

.subnav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: .5rem clamp(1rem, 3vw, 2.2rem);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: .6rem var(--gutter);
}

.subnav__item {
  display: flex;
  align-items: center;
  gap: .5rem;
}

.subnav__item::before {
  content: "";
  flex: none;
  width: 5px;
  height: 5px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.subnav__item:nth-child(2)::before { background: var(--lime); }
.subnav__item:nth-child(3)::before { background: var(--amber); }
.subnav__item:nth-child(4)::before { background: var(--lava); }

.subnav__link {
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color .2s var(--ease);
}

.subnav__link:hover,
.subnav__link:focus-visible { color: var(--lava); }

/* 收窄粘性条 */
.site-header.is-condensed .masthead__inner { padding-block: .5rem; }
.site-header.is-condensed .brand__mark { width: 1.9rem; height: 1.9rem; font-size: .9rem; }
.site-header.is-condensed .brand__name { font-size: 1.28rem; }
.site-header.is-condensed .brand__sub,
.site-header.is-condensed .mono-tag,
.site-header.is-condensed .status-pill__meta { display: none; }
.site-header.is-condensed .subnav { display: none; }
.site-header.is-condensed .site-nav__list { padding-block: .5rem; }
.site-nav[data-open] .subnav { display: block; }

/* ---------- 13. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 8vw, 6rem);
  background: #08090A;
  border-top: 1px solid var(--line);
  color: var(--mist);
}

.site-footer::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: linear-gradient(90deg, var(--lava), var(--lava-deep) 38%, rgba(255, 74, 23, 0) 88%);
}

.footer__inner {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4rem) var(--gutter) 1.5rem;
}

.footer__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  padding-bottom: clamp(1.5rem, 4vw, 2.5rem);
}

.footer__brand { display: flex; flex-direction: column; gap: .7rem; }
.footer__brand .brand { justify-self: start; }

.footer__tagline {
  margin: 0;
  padding-left: .95rem;
  position: relative;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .14em;
  color: var(--cyan);
}

.footer__tagline::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 7px;
  height: 2px;
  background: var(--cyan);
}

.footer__actions { display: flex; flex-wrap: wrap; gap: .6rem; }

.footer__cols {
  display: grid;
  grid-template-columns: 1.5fr 1.2fr 1fr 1.1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(1.5rem, 4vw, 2.5rem);
  border-top: 1px solid var(--line);
}

.footer__col { display: flex; flex-direction: column; gap: .9rem; }

.footer__title {
  font-family: var(--font-mono);
  font-size: .74rem;
  font-weight: 700;
  letter-spacing: .2em;
  color: var(--lava);
}

.footer__list { display: flex; flex-direction: column; gap: .45rem; }

.footer__list--meta { font-family: var(--font-mono); font-size: .8rem; }

.footer__link {
  position: relative;
  display: inline-block;
  padding-bottom: 1px;
  color: var(--mist);
  font-size: .88rem;
  text-align: left;
  text-decoration: none;
  transition: color .2s var(--ease);
}

.footer__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--lava);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform .2s var(--ease);
}

.footer__link:hover,
.footer__link:focus-visible { color: var(--cream); }
.footer__link:hover::after,
.footer__link:focus-visible::after { transform: scaleX(1); }
.footer__link.is-copied { color: var(--lime); }

.footer__text { display: inline-block; color: var(--mist); }

.footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: clamp(1.8rem, 4vw, 2.8rem);
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
}

.footer__copy-line {
  margin: 0;
  max-width: none;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .08em;
  color: var(--mist);
}

.to-top {
  padding: .45rem .95rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .1em;
  color: var(--mist);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.to-top:hover,
.to-top:focus-visible { border-color: var(--lava); color: var(--lava); }

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1024px) {
  .footer__cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .nav-toggle { display: inline-flex; }

  .masthead__inner {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "status toggle"
      "brand brand";
    row-gap: .75rem;
  }

  .status-pill { grid-area: status; justify-self: start; }
  .brand { grid-area: brand; justify-self: center; }
  .masthead__aside { display: none; }
  .nav-toggle { grid-area: toggle; }

  .site-nav { display: none; }
  .site-nav[data-open] { display: block; }

  .site-nav__list {
    flex-wrap: nowrap;
    justify-content: flex-start;
    gap: 1.5rem;
    padding-block: .9rem;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .site-nav__link { white-space: nowrap; }

  .subnav__list {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .anchor-rail { position: static; }
}

@media (max-width: 640px) {
  body {
    background-attachment: scroll, scroll, scroll, scroll;
  }

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

  .footer__cols { grid-template-columns: 1fr; }

  .footer__head { align-items: flex-start; }

  .footer__actions { width: 100%; }

  .btn { padding: .72rem 1.25rem; font-size: .86rem; }
}

/* ---------- 15. 无障碍与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

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

  .status-pill__dot { animation: none; }

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