/* ============================================================
   球盟会赛场 · 共享样式 /assets/site.css
   夜间赛场指挥台：战术板网格 + 信号青绿 + 比分暖橙
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
}

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

ul, ol { padding: 0; }

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

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

button { background: none; border: 0; }

a { color: inherit; }

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

/* ---------- 2. Tokens ---------- */
:root {
  /* 色彩 */
  --ink-900: #071A14;
  --ink-850: #08201A;
  --ink-800: #0E2A21;
  --ink-750: #10261E;
  --signal: #5CFFC2;
  --signal-soft: #A9FFE0;
  --score: #FF8A3D;
  --amber: #FFD166;
  --paper: #E9F4EF;
  --mute: #8BA79C;
  --mute-strong: #A9C4B8;
  --line: #1F4A3A;
  --line-soft: rgba(31, 74, 58, 0.62);
  --paper-light: #F4FBF7;
  --ink-on-paper: #10251D;
  --link-on-paper: #0B6B4F;

  /* 字体 */
  --font-display: "Saira Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* 字号令牌 */
  --fs-index: 0.75rem;
  --fs-aux: 0.875rem;
  --fs-body: 1.0625rem;
  --fs-h3: 1.375rem;
  --fs-h2: clamp(1.75rem, 3.2vw, 2.5rem);
  --fs-h1: clamp(2.6rem, 5vw, 4.8rem);
  --fs-score: clamp(3.5rem, 7vw, 6rem);

  /* 尺度 */
  --shell-max: 1240px;
  --radius: 18px;
  --radius-sm: 10px;
  --gutter: clamp(1.125rem, 4vw, 2.5rem);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --shadow-signal: 0 0 0 1px rgba(92, 255, 194, 0.22), 0 24px 56px -30px rgba(0, 0, 0, 0.92);
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.75;
  color: var(--paper);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(1100px 560px at 84% -8%, rgba(92, 255, 194, 0.10), transparent 62%),
    radial-gradient(720px 440px at 2% 104%, rgba(255, 138, 61, 0.08), transparent 66%),
    repeating-linear-gradient(0deg, var(--line-soft) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(90deg, var(--line-soft) 0 1px, transparent 1px 64px);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

p { max-width: 42em; }

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

::selection {
  background: rgba(92, 255, 194, 0.34);
  color: #04150F;
}

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

.paper-surface :focus-visible { outline-color: var(--link-on-paper); }

.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 300;
  padding: 0.65rem 1.1rem;
  border-radius: var(--radius-sm);
  background: var(--signal);
  color: #04150F;
  font-weight: 700;
  font-size: var(--fs-aux);
  text-decoration: none;
  transform: translateY(-220%);
  transition: transform 0.18s var(--ease);
}

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

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

/* ---------- 5. 容器与基础布局 ---------- */
.shell {
  width: min(100% - 2.25rem, var(--shell-max));
  margin-inline: auto;
}

main { display: block; }

#main-content:focus { outline: none; }

section[id],
[id][data-anchor] { scroll-margin-top: 118px; }

/* ---------- 6. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 120;
  background:
    linear-gradient(180deg, rgba(8, 32, 26, 0.98), rgba(7, 26, 20, 0.94));
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-header::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--signal) 0 34%, var(--signal-soft) 34% 52%, var(--score) 52% 74%, rgba(255, 209, 102, 0.7) 74% 100%);
  opacity: 0.9;
}

.site-header__shell {
  width: min(100% - 2.25rem, var(--shell-max));
  margin-inline: auto;
  padding-block: 0.85rem 0.75rem;
  transition: padding-block 0.24s var(--ease);
}

.site-header[data-condensed] .site-header__shell {
  padding-block: 0.42rem 0.4rem;
}

.site-header__top {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: nowrap;
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: var(--paper);
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  align-content: center;
  justify-items: start;
  gap: 3px;
  width: 38px;
  height: 38px;
  padding: 0 8px;
  border-radius: 12px;
  border: 1px solid rgba(92, 255, 194, 0.45);
  background:
    linear-gradient(150deg, rgba(92, 255, 194, 0.22), rgba(14, 42, 33, 0.9) 70%);
  box-shadow: inset 0 0 18px rgba(92, 255, 194, 0.12);
}

.brand__mark-line {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--signal);
}

.brand__mark-line:nth-child(1) { width: 20px; }
.brand__mark-line:nth-child(2) { width: 13px; background: var(--score); }
.brand__mark-line:nth-child(3) { width: 17px; background: var(--signal-soft); }

.brand__text { display: grid; gap: 0.1rem; }

.brand__name {
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.1;
}

.brand__tagline {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.13em;
  color: var(--mute);
  text-transform: uppercase;
  line-height: 1.2;
}

.brand:hover .brand__name { color: var(--signal-soft); }

/* 运营状态条 */
.utility-line {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: auto;
  padding: 0.34rem 0.8rem;
  max-width: none;
  border: 1px dashed rgba(92, 255, 194, 0.32);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--mute-strong);
  white-space: nowrap;
}

.utility-line__pulse {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--signal);
  box-shadow: 0 0 0 0 rgba(92, 255, 194, 0.55);
  animation: pulse-signal 2.8s ease-in-out infinite;
}

@keyframes pulse-signal {
  0%, 100% { box-shadow: 0 0 0 0 rgba(92, 255, 194, 0.45); opacity: 0.75; }
  50% { box-shadow: 0 0 0 7px rgba(92, 255, 194, 0); opacity: 1; }
}

/* 移动导航按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(92, 255, 194, 0.4);
  background: rgba(14, 42, 33, 0.92);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), background 0.18s var(--ease);
}

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

.nav-toggle[aria-expanded="true"] {
  color: var(--signal);
  border-color: var(--signal);
  background: rgba(92, 255, 194, 0.14);
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* 主导航：移动端折叠 */
.primary-nav { display: none; }

.primary-nav[data-open] {
  display: grid;
  gap: 0.6rem;
  margin-top: 0.8rem;
  padding-top: 0.85rem;
  border-top: 1px dashed var(--line);
}

.primary-nav__list {
  display: grid;
  gap: 0.32rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-nav__item { display: block; }

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.68rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(31, 74, 58, 0.85);
  background: rgba(14, 42, 33, 0.72);
  color: var(--paper);
  font-size: 0.98rem;
  font-weight: 500;
  text-decoration: none;
  position: relative;
  transition: color 0.18s var(--ease), background 0.18s var(--ease), border-color 0.18s var(--ease);
}

.nav-link__index {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--mute);
  transition: color 0.18s var(--ease);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--signal-soft);
  border-color: rgba(92, 255, 194, 0.5);
  background: rgba(92, 255, 194, 0.1);
}

.nav-link:hover .nav-link__index { color: var(--score); }

.nav-link[aria-current="page"] {
  color: var(--signal);
  border-color: rgba(92, 255, 194, 0.6);
  background: rgba(92, 255, 194, 0.12);
}

.nav-link[aria-current="page"] .nav-link__index { color: var(--signal); }

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 0.75rem;
  right: 0.75rem;
  bottom: 0.24rem;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--signal), var(--score));
}

.primary-nav__aside {
  display: grid;
  gap: 0.6rem;
  justify-items: start;
}

.primary-nav__hint {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.05em;
  color: var(--mute);
}

/* 滚动进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--signal), var(--signal-soft) 45%, var(--score));
  pointer-events: none;
  will-change: transform;
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.25;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--signal {
  background: var(--signal);
  color: #04150F;
  box-shadow: 0 12px 28px -16px rgba(92, 255, 194, 0.9);
}

.btn--signal:hover { background: var(--signal-soft); color: #04150F; }

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(92, 255, 194, 0.45);
}

.btn--ghost:hover {
  color: var(--signal);
  border-color: var(--signal);
  background: rgba(92, 255, 194, 0.1);
}

.btn--sm {
  padding: 0.48rem 0.95rem;
  font-size: 0.84rem;
}

/* ---------- 8. 章节骨架 ---------- */
.section {
  padding-block: clamp(2.5rem, 6vw, 4.5rem);
}

.section__head {
  display: grid;
  gap: 0.65rem;
  margin-bottom: clamp(1.4rem, 3vw, 2.4rem);
  max-width: 46rem;
}

.section__index {
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--score);
}

.section__title { font-size: var(--fs-h2); }

.section__lede {
  color: var(--mute-strong);
  font-size: 0.98rem;
  max-width: 40em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: var(--fs-index);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
}

.divider {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--line), transparent);
  margin-block: 2rem;
}

/* ---------- 9. 栅格 ---------- */
.grid {
  display: grid;
  gap: clamp(0.9rem, 2vw, 1.5rem);
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--sidebar { grid-template-columns: 260px minmax(0, 1fr); align-items: start; gap: 2.25rem; }
}

/* ---------- 10. 卡片与面板 ---------- */
.card {
  position: relative;
  padding: clamp(1.05rem, 2.4vw, 1.6rem);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    linear-gradient(160deg, rgba(16, 38, 30, 0.96), rgba(10, 30, 24, 0.92));
  box-shadow: var(--shadow-signal);
  overflow: hidden;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
  background: linear-gradient(180deg, var(--signal), transparent 70%);
  opacity: 0.7;
}

.card__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.7rem;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.card__body {
  color: var(--mute-strong);
  font-size: 0.95rem;
}

.panel {
  border-radius: var(--radius);
  border: 1px dashed rgba(92, 255, 194, 0.3);
  background: rgba(14, 42, 33, 0.62);
  padding: clamp(1rem, 2.4vw, 1.4rem);
}

.panel__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--signal-soft);
  margin-bottom: 0.55rem;
}

.panel__body {
  color: var(--mute-strong);
  font-size: 0.94rem;
}

/* ---------- 11. 标签与数据 ---------- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.24rem 0.62rem;
  border-radius: 999px;
  border: 1px solid rgba(92, 255, 194, 0.34);
  background: rgba(92, 255, 194, 0.1);
  color: var(--signal-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.5;
  white-space: nowrap;
}

.chip--score {
  border-color: rgba(255, 138, 61, 0.44);
  background: rgba(255, 138, 61, 0.14);
  color: var(--score);
}

.chip--amber {
  border-color: rgba(255, 209, 102, 0.45);
  background: rgba(255, 209, 102, 0.13);
  color: var(--amber);
}

.chip__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.score {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.score__num {
  font-family: var(--font-mono);
  font-size: var(--fs-score);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--signal);
  font-variant-numeric: tabular-nums;
}

.score__num em {
  font-style: normal;
  color: var(--score);
}

.score__meta {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--mute);
}

.stat {
  display: grid;
  gap: 0.2rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: rgba(14, 42, 33, 0.6);
}

.stat__value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 600;
  line-height: 1.1;
  color: var(--signal-soft);
  font-variant-numeric: tabular-nums;
}

.stat__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
}

/* ---------- 12. 图片容器 ---------- */
.media-frame {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(92, 255, 194, 0.16), rgba(14, 42, 33, 0.94) 58%, rgba(255, 138, 61, 0.14)),
    var(--ink-800);
  background-size: cover;
  background-position: center;
}

.media-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    repeating-linear-gradient(90deg, rgba(169, 255, 224, 0.13) 0 1px, transparent 1px 46px),
    repeating-linear-gradient(0deg, rgba(169, 255, 224, 0.09) 0 1px, transparent 1px 46px);
  opacity: 0.75;
  pointer-events: none;
}

.media-frame::after {
  content: "";
  position: absolute;
  z-index: 0;
  right: -18%;
  bottom: -32%;
  width: 62%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(92, 255, 194, 0.26), transparent 66%);
  pointer-events: none;
}

.media-frame img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.media-frame__caption {
  position: absolute;
  z-index: 2;
  left: 0.75rem;
  bottom: 0.75rem;
  margin: 0;
  padding: 0.24rem 0.62rem;
  border-radius: 999px;
  background: rgba(7, 26, 20, 0.82);
  border: 1px solid rgba(92, 255, 194, 0.34);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--signal-soft);
}

/* ---------- 13. 面包屑 ---------- */
.breadcrumb {
  padding-block: 1rem 0;
}

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--mute);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 0.45rem; }

.breadcrumb__link {
  color: var(--mute-strong);
  text-decoration: none;
}

.breadcrumb__link:hover { color: var(--signal); }

.breadcrumb__sep { color: var(--line); }

/* ---------- 14. 正文与目录 ---------- */
.prose {
  max-width: 40em;
  color: var(--paper);
  font-size: var(--fs-body);
  line-height: 1.85;
}

.prose > * + * { margin-top: 1.1em; }

.prose h2,
.prose h3 { margin-top: 1.9em; color: var(--paper); }

.prose a {
  color: var(--signal);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.prose a:hover { color: var(--signal-soft); }

.prose ul,
.prose ol { padding-left: 1.35em; }

.prose li + li { margin-top: 0.4em; }

.toc {
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  border: 1px dashed rgba(92, 255, 194, 0.28);
  background: rgba(14, 42, 33, 0.6);
}

.toc__list {
  display: grid;
  gap: 0.18rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.toc__link {
  display: block;
  padding: 0.42rem 0.6rem;
  border-left: 2px solid transparent;
  border-radius: 0 6px 6px 0;
  color: var(--mute-strong);
  font-size: 0.9rem;
  text-decoration: none;
  transition: color 0.16s var(--ease), background 0.16s var(--ease), border-color 0.16s var(--ease);
}

.toc__link:hover { color: var(--signal-soft); background: rgba(92, 255, 194, 0.08); }

.toc__link.is-active {
  color: var(--signal);
  border-left-color: var(--score);
  background: rgba(92, 255, 194, 0.12);
}

/* ---------- 15. 纸面阅读区（法律页） ---------- */
.paper-surface {
  color: var(--ink-on-paper);
  background-color: var(--paper-light);
  background-image:
    repeating-linear-gradient(0deg, rgba(16, 37, 29, 0.05) 0 1px, transparent 1px 56px),
    repeating-linear-gradient(90deg, rgba(16, 37, 29, 0.05) 0 1px, transparent 1px 56px);
  background-attachment: fixed;
}

.paper-surface .prose { color: var(--ink-on-paper); }

.paper-surface .prose a { color: var(--link-on-paper); }

.paper-surface h1,
.paper-surface h2,
.paper-surface h3 { color: var(--ink-on-paper); }

.paper-surface .section__lede { color: #35544A; }

/* ---------- 16. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(3rem, 7vw, 5.5rem);
  padding-top: 0.4rem;
  color: var(--paper);
  background:
    linear-gradient(180deg, #08201A 0%, #061510 68%, #040F0B 100%);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  display: block;
  height: 3px;
  background: linear-gradient(90deg, var(--score) 0 18%, var(--signal) 18% 62%, rgba(92, 255, 194, 0.2) 62% 100%);
  opacity: 0.85;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding-block: clamp(2.5rem, 5vw, 3.75rem) 2.25rem;
}

@media (min-width: 620px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 980px) {
  .site-footer__grid {
    grid-template-columns: 1.6fr 0.75fr 0.75fr 0.75fr 1.25fr;
    gap: 1.75rem;
  }
}

.site-footer__brand { display: grid; gap: 0.9rem; align-content: start; }

.brand--footer .brand__mark { width: 34px; height: 34px; }

.brand--footer .brand__name { font-size: 1.05rem; }

.site-footer__excerpt {
  max-width: 30em;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--mute-strong);
}

.site-footer__meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--mute);
  max-width: none;
}

.footer-nav { display: grid; gap: 0.75rem; align-content: start; }

.footer-nav__title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal-soft);
}

.footer-nav__title::before {
  content: "";
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background: var(--score);
}

.footer-nav__list {
  display: grid;
  gap: 0.42rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-nav__link {
  display: inline-block;
  color: var(--mute-strong);
  font-size: 0.93rem;
  text-decoration: none;
  transition: color 0.16s var(--ease), transform 0.16s var(--ease);
}

.footer-nav__link:hover {
  color: var(--signal);
  transform: translateX(3px);
}

.site-footer__contact { display: grid; gap: 0.75rem; align-content: start; }

.contact-list {
  display: grid;
  gap: 0.7rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.contact-list__item {
  display: grid;
  gap: 0.12rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px dashed rgba(31, 74, 58, 0.85);
}

.contact-list__item:last-child { border-bottom: 0; padding-bottom: 0; }

.contact-list__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
}

.contact-list__value {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--paper);
  word-break: break-word;
}

.site-footer__base {
  display: grid;
  gap: 0.7rem;
  padding-block: 1.25rem 2rem;
  border-top: 1px solid rgba(31, 74, 58, 0.8);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--mute);
}

.site-footer__base p { max-width: none; }

.site-footer__base-note {
  line-height: 1.7;
  max-width: 62em;
}

@media (min-width: 720px) {
  .site-footer__base {
    grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.2fr);
    align-items: start;
    gap: 1.5rem;
  }
}

/* ---------- 17. 返回顶部 ---------- */
.to-top {
  position: fixed;
  right: clamp(0.9rem, 3vw, 2rem);
  bottom: clamp(0.9rem, 3vw, 2rem);
  z-index: 140;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 0.95rem;
  border-radius: 999px;
  border: 1px solid rgba(92, 255, 194, 0.5);
  background: rgba(8, 32, 26, 0.94);
  color: var(--signal);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 18px 40px -22px rgba(0, 0, 0, 0.95);
  transition: transform 0.18s var(--ease), background 0.18s var(--ease), color 0.18s var(--ease);
}

.to-top:hover {
  background: rgba(92, 255, 194, 0.16);
  color: var(--signal-soft);
  transform: translateY(-2px);
}

.to-top[hidden] { display: none; }

.to-top__arrow { font-size: 0.95rem; line-height: 1; }

/* ---------- 18. 桌面 / 平板增强 ---------- */
@media (min-width: 880px) {
  .nav-toggle { display: none; }

  .utility-line { margin-left: auto; }

  .primary-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.25rem;
    margin-top: 0.7rem;
    padding-top: 0.6rem;
    border-top: 1px dashed rgba(31, 74, 58, 0.9);
  }

  .primary-nav__list {
    display: flex;
    align-items: center;
    gap: 0.1rem;
    flex-wrap: wrap;
  }

  .nav-link {
    border: 1px solid transparent;
    background: transparent;
    padding: 0.46rem 0.7rem;
    font-size: 0.95rem;
  }

  .nav-link:hover,
  .nav-link:focus-visible { background: rgba(92, 255, 194, 0.09); }

  .nav-link[aria-current="page"] {
    background: rgba(92, 255, 194, 0.1);
    border-color: transparent;
  }

  .nav-link[aria-current="page"]::after {
    left: 0.7rem;
    right: 0.7rem;
    bottom: 0.16rem;
  }

  .primary-nav__aside {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    flex: 0 0 auto;
  }

  .primary-nav__hint { font-size: 0.68rem; }
}

@media (min-width: 1024px) {
  .site-header__shell { padding-block: 1rem 0.85rem; }
  .site-header[data-condensed] .site-header__shell { padding-block: 0.5rem 0.45rem; }
}

/* ---------- 19. 小屏适配 ---------- */
@media (max-width: 719px) {
  .utility-line { display: none; }
  .brand__tagline { display: none; }
  .primary-nav__hint { display: none; }
  .score__num { font-size: clamp(3rem, 14vw, 4.6rem); }
  .site-footer__base { font-size: 0.7rem; }
}

@media (max-width: 400px) {
  .nav-toggle__label { display: none; }
  .to-top__label { display: none; }
  .to-top { padding: 0.68rem 0.8rem; }
}

/* ---------- 20. 减少动态 ---------- */
@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;
  }

  .utility-line__pulse { animation: none; opacity: 1; }
  .btn:hover,
  .to-top:hover,
  .footer-nav__link:hover { transform: none; }
}