/* ==========================================================================
   爱游戏赛场 · 共享样式表 /assets/site.css
   色板：夜赛墨绿 · 主场深绿 · 草皮绿 · 荧光草绿 · 信号黄 · 警示红 · 冷白
   ========================================================================== */

/* ---------- 1. 重置 ---------- */
*,
*::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, li, figure, blockquote, dl, dt, dd {
  margin: 0;
  padding: 0;
}

ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
:where(a, button, [tabindex]):focus { outline: none; }

/* ---------- 2. 设计令牌 ---------- */
:root {
  --night: #071712;
  --night-deep: #04100C;
  --pitch: #0B2A23;
  --turf: #1F8A5B;
  --lime: #B7FF4A;
  --signal: #FFD447;
  --alert: #E4473E;
  --white: #F4F8F3;
  --grey: #C9D2CC;
  --cyan: #2DD4BF;
  --violet: #6C5CE7;

  --bg: var(--night);
  --bg-raise: var(--pitch);
  --text: var(--white);
  --text-dim: var(--grey);
  --line: rgba(201, 210, 204, 0.16);
  --line-strong: rgba(201, 210, 204, 0.34);
  --line-lime: rgba(183, 255, 74, 0.45);

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-body: var(--font-display);
  --font-mono: "IBM Plex Mono", "JetBrains Mono", "SFMono-Regular", ui-monospace, "Courier New", monospace;

  --step-hero: clamp(3rem, 8vw, 7rem);
  --step-1: clamp(1.9rem, 4.2vw, 3.1rem);
  --step-2: clamp(1.3rem, 2.4vw, 1.85rem);
  --step-3: 1.125rem;
  --step-body: 1rem;
  --step-small: 0.875rem;
  --step-micro: 0.75rem;

  --wrap: 1280px;
  --gutter: clamp(1.15rem, 4vw, 3.25rem);
  --section-y: clamp(3.5rem, 9vw, 7.5rem);
  --radius: 2px;
  --shadow-card: 0 18px 42px -30px rgba(0, 0, 0, 0.9);
  --shadow-lime: 0 12px 32px -18px rgba(183, 255, 74, 0.7);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 78px;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--bg);
  background-image:
    radial-gradient(120% 90% at 100% 0%, rgba(31, 138, 91, 0.20) 0%, rgba(7, 23, 18, 0) 58%),
    radial-gradient(80% 60% at 0% 100%, rgba(45, 212, 191, 0.10) 0%, rgba(7, 23, 18, 0) 60%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--step-body);
  font-weight: 400;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

p { max-width: 74ch; }
strong { font-weight: 900; color: var(--white); }

::selection {
  background: var(--lime);
  color: var(--night-deep);
}

#main-content { display: block; scroll-margin-top: calc(var(--header-h) + 12px); }

/* ---------- 4. 无障碍 ---------- */
.skip-link {
  position: fixed;
  left: 1rem;
  top: -140%;
  z-index: 400;
  padding: 0.75rem 1.15rem;
  background: var(--lime);
  color: var(--night-deep);
  font-size: 0.9rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  border-radius: var(--radius);
  transition: top 0.22s var(--ease);
}
.skip-link:focus { top: 1rem; }

:where(a, button, [tabindex]):focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 3px;
  border-radius: var(--radius);
}

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

/* ---------- 5. 容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.container-wide { max-width: 1440px; }

.section { padding-block: var(--section-y); }
.section-tight { padding-block: clamp(2rem, 5vw, 3.5rem); }

.section-head {
  display: grid;
  gap: 0.85rem;
  max-width: 72ch;
  margin-bottom: clamp(1.8rem, 4vw, 3rem);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-mono);
  font-size: var(--step-micro);
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--lime);
  flex: 0 0 auto;
}

.section-title { font-size: var(--step-1); }
.section-lead {
  color: var(--text-dim);
  font-size: var(--step-body);
  max-width: 64ch;
}

.grid { display: grid; gap: clamp(1rem, 2.4vw, 1.6rem); }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.chapter { position: relative; }
.chapter-index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.2rem, 5.2vw, 3.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--turf);
  margin-bottom: 0.55rem;
  transition: color 0.3s var(--ease);
}
[data-chapter].is-active .chapter-index { color: var(--lime); }

.edge-line {
  height: 2px;
  border: 0;
  background: linear-gradient(90deg, var(--lime) 0%, var(--turf) 42%, rgba(45, 212, 191, 0.4) 68%, transparent 100%);
}
.rule { height: 1px; border: 0; background: var(--line); }
.mono { font-family: var(--font-mono); }
.text-dim { color: var(--text-dim); }
.lime-text { color: var(--lime); }

/* ---------- 6. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.55rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.2;
  transition: transform 0.2s var(--ease), background-color 0.2s var(--ease),
    color 0.2s var(--ease), border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
}
.btn-primary {
  background: var(--lime);
  color: var(--night-deep);
  box-shadow: var(--shadow-lime);
}
.btn-primary:hover { background: var(--signal); transform: translateY(-2px); }
.btn-ghost {
  border-color: var(--line-strong);
  color: var(--white);
}
.btn-ghost:hover { border-color: var(--lime); color: var(--lime); transform: translateY(-2px); }
.btn-sm { padding: 0.6rem 1.05rem; font-size: 0.8rem; }
.btn-block { width: 100%; }

/* ---------- 7. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.24rem 0.62rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  line-height: 1.5;
  color: var(--text-dim);
  text-transform: uppercase;
  white-space: nowrap;
}
.tag-lime { background: rgba(183, 255, 74, 0.12); border-color: var(--line-lime); color: var(--lime); }
.tag-signal { background: rgba(255, 212, 71, 0.14); border-color: rgba(255, 212, 71, 0.55); color: var(--signal); }
.tag-alert { background: rgba(228, 71, 62, 0.16); border-color: rgba(228, 71, 62, 0.55); color: #FF918A; }
.tag-cyan { background: rgba(45, 212, 191, 0.12); border-color: rgba(45, 212, 191, 0.5); color: var(--cyan); }
.tag-violet { background: rgba(108, 92, 231, 0.18); border-color: rgba(108, 92, 231, 0.6); color: #B4AAFF; }

/* ---------- 8. 卡片 ---------- */
.card {
  position: relative;
  display: block;
  padding: clamp(1.25rem, 3vw, 1.9rem);
  background: var(--bg-raise);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 38px;
  height: 3px;
  background: var(--turf);
  transition: width 0.25s var(--ease), background-color 0.25s var(--ease);
}
.card:hover { border-color: var(--line-lime); transform: translateY(-3px); }
.card:hover::before { width: 68px; background: var(--lime); }
.card-title {
  font-size: var(--step-3);
  font-weight: 900;
  color: var(--white);
  margin-bottom: 0.5rem;
}
.card-text { font-size: 0.94rem; color: var(--text-dim); }
.card-tag { position: absolute; top: 0.95rem; right: 0.95rem; }

/* ---------- 9. 面包屑 ---------- */
.breadcrumb { padding-top: 1.5rem; font-size: var(--step-small); }
.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.breadcrumb-item { display: inline-flex; align-items: center; gap: 0.5rem; }
.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: rgba(201, 210, 204, 0.4);
}
.crumb-link { color: var(--text-dim); transition: color 0.2s var(--ease); }
.crumb-link:hover { color: var(--lime); }
.breadcrumb-item[aria-current="page"] { color: var(--white); }

/* ---------- 10. 图片容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(140deg, rgba(31, 138, 91, 0.28) 0%, rgba(4, 16, 12, 0.96) 72%),
    var(--bg-raise);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(4, 16, 12, 0) 42%, rgba(4, 16, 12, 0.78) 100%);
  pointer-events: none;
}
.media-frame--plain::after { display: none; }
.media-frame--portrait { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-caption {
  position: absolute;
  left: 1rem;
  right: 1rem;
  bottom: 0.9rem;
  z-index: 2;
  font-size: var(--step-small);
  letter-spacing: 0.04em;
  color: var(--white);
}
.media-tag { position: absolute; top: 0.9rem; left: 0.9rem; z-index: 2; }

/* ---------- 11. 数据表 ---------- */
.data-table {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border: 1px solid var(--line);
  background: rgba(11, 42, 35, 0.5);
}
.data-table caption {
  padding: 0.85rem 1rem;
  text-align: left;
  font-family: var(--font-body);
  font-size: var(--step-small);
  letter-spacing: 0.1em;
  color: var(--text-dim);
}
.data-table th,
.data-table td {
  padding: 0.72rem 0.95rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
.data-table th {
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
  background: rgba(4, 16, 12, 0.6);
}
.data-table tbody tr:hover { background: rgba(31, 138, 91, 0.14); }
.data-table td.num { color: var(--white); }

/* ---------- 12. 标签页 ---------- */
.tabs { display: block; }
.tab-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-bottom: 0.7rem;
  margin-bottom: 1.7rem;
  border-bottom: 1px solid var(--line);
}
.tab-btn {
  padding: 0.55rem 1.05rem;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.tab-btn:hover { color: var(--white); border-color: var(--line-strong); }
.tab-btn[aria-selected="true"] {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--night-deep);
}
.tab-panel { animation: tabIn 0.32s var(--ease) both; }
.tab-panel[hidden] { display: none; }
@keyframes tabIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 13. 手风琴 ---------- */
.accordion-item { border-bottom: 1px solid var(--line); }
.accordion-trigger {
  width: 100%;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.1rem 0;
  text-align: left;
  font-size: var(--step-body);
  font-weight: 700;
  color: var(--white);
  transition: color 0.2s var(--ease);
}
.accordion-trigger:hover { color: var(--lime); }
.accordion-trigger::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--lime);
  flex: 0 0 auto;
}
.accordion-trigger[aria-expanded="true"]::after { content: "\2212"; }
.accordion-panel {
  padding: 0 0 1.25rem;
  font-size: 0.95rem;
  color: var(--text-dim);
}
.accordion-panel[hidden] { display: none; }

/* ---------- 14. 滚动元件 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }

.scroll-progress {
  position: fixed;
  inset: 0 0 auto 0;
  height: 3px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--lime) 0%, var(--cyan) 62%, var(--violet) 100%);
  z-index: 320;
  pointer-events: none;
}

.to-top {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 160;
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: rgba(11, 42, 35, 0.92);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 1rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.25s var(--ease), transform 0.25s var(--ease),
    visibility 0.25s, border-color 0.25s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--lime); }

/* ---------- 15. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(7, 23, 18, 0.94);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(1rem, 3vw, 2.5rem);
  width: 100%;
  max-width: 1440px;
  min-height: var(--header-h);
  margin-inline: auto;
  padding: 0.7rem var(--gutter);
}

.header-edge {
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--lime) 0%, var(--turf) 34%, rgba(45, 212, 191, 0.55) 60%, rgba(201, 210, 204, 0.08) 100%);
}

.brand-rail { display: flex; align-items: center; min-width: 0; }

.brand {
  display: flex;
  align-items: center;
  gap: 0.72rem;
  min-width: 0;
}

.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border-radius: var(--radius);
  border: 1px solid var(--line-lime);
  background: linear-gradient(135deg, var(--turf) 0%, var(--night-deep) 78%);
  overflow: hidden;
}
.brand-mark::before {
  content: "";
  position: absolute;
  right: -10px;
  bottom: -12px;
  width: 40px;
  height: 16px;
  background: var(--lime);
  transform: rotate(-45deg);
  opacity: 0.9;
}
.brand-mark::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--signal);
  box-shadow: 0 0 0 3px rgba(255, 212, 71, 0.16);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}
.brand-name {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--white);
}
.brand-line {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--text-dim);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-cluster {
  display: flex;
  align-items: center;
  gap: clamp(0.6rem, 1.8vw, 1.7rem);
  min-width: 0;
}

.primary-nav { min-width: 0; }

.nav-list {
  display: flex;
  align-items: center;
  gap: clamp(0.45rem, 1.5vw, 1.4rem);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.34rem;
  padding: 0.5rem 0.1rem;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  white-space: nowrap;
  color: var(--text-dim);
  transition: color 0.2s var(--ease);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  background: var(--lime);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s var(--ease);
}
.nav-link:hover { color: var(--white); }
.nav-link:hover::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--lime); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }

.nav-idx {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  color: rgba(201, 210, 204, 0.55);
  transition: color 0.2s var(--ease);
}
.nav-link:hover .nav-idx,
.nav-link[aria-current="page"] .nav-idx { color: var(--lime); }

.utility-rail {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-left: clamp(0.6rem, 1.8vw, 1.2rem);
  border-left: 1px solid var(--line);
}

.utility-link {
  display: inline-flex;
  align-items: center;
  padding: 0.42rem 0.72rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  white-space: nowrap;
  color: var(--text-dim);
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease),
    background-color 0.22s var(--ease);
}
.utility-link:hover { color: var(--white); border-color: var(--grey); }
.utility-link--cta {
  background: var(--lime);
  border-color: var(--lime);
  color: var(--night-deep);
}
.utility-link--cta:hover {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--night-deep);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  padding: 0.5rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  color: var(--white);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  transition: border-color 0.22s var(--ease), color 0.22s var(--ease);
}
.nav-toggle:hover { border-color: var(--lime); color: var(--lime); }

.nav-toggle-bars {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 18px;
  flex: 0 0 auto;
}
.nav-toggle-bars span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--lime);
  transition: transform 0.25s var(--ease), opacity 0.2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(6px) 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(-6px) rotate(-45deg); }

/* ---------- 16. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--section-y);
  background: linear-gradient(180deg, rgba(7, 23, 18, 0.4) 0%, var(--night-deep) 100%);
  border-top: 1px solid var(--line);
  color: var(--text-dim);
}

.footer-edge {
  display: block;
  height: 3px;
  background: linear-gradient(90deg,
    rgba(201, 210, 204, 0.06) 0%,
    var(--turf) 16%,
    var(--lime) 42%,
    var(--signal) 66%,
    var(--alert) 86%,
    rgba(201, 210, 204, 0.06) 100%);
  opacity: 0.78;
}

.footer-inner {
  width: 100%;
  max-width: 1440px;
  margin-inline: auto;
  padding: clamp(2.6rem, 6vw, 4.8rem) var(--gutter) 2rem;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(230px, 1fr) minmax(0, 2.2fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
}

.footer-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
}
.footer-mark-dot {
  width: 11px;
  height: 11px;
  background: var(--lime);
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px rgba(183, 255, 74, 0.12);
  flex: 0 0 auto;
}
.footer-brand-name {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  color: var(--white);
}
.footer-tagline {
  font-size: 0.85rem;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 3rem);
}

.footer-col-title,
.footer-contact-title {
  margin-bottom: 1rem;
  padding-left: 0.7rem;
  border-left: 2px solid var(--turf);
  font-size: 0.8rem;
  font-weight: 900;
  letter-spacing: 0.2em;
  color: var(--lime);
}

.footer-links { display: grid; gap: 0.55rem; }
.footer-link {
  display: inline-block;
  font-size: 0.92rem;
  color: var(--text-dim);
  transition: color 0.2s var(--ease), padding-left 0.2s var(--ease);
}
.footer-link:hover { color: var(--white); padding-left: 0.35rem; }

.footer-contact {
  padding: clamp(1.8rem, 4vw, 2.6rem) 0 clamp(1.4rem, 3vw, 2rem);
  border-bottom: 1px solid var(--line);
}

.contact-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(215px, 1fr));
  gap: 1.1rem 2rem;
}
.contact-item { display: flex; flex-direction: column; gap: 0.3rem; min-width: 0; }
.contact-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: rgba(201, 210, 204, 0.6);
}
.contact-value {
  font-size: 0.95rem;
  color: var(--white);
  word-break: break-word;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem 2rem;
  padding-top: 1.5rem;
  font-size: 0.8rem;
  color: rgba(201, 210, 204, 0.75);
}
.footer-note { max-width: 62ch; }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.1rem;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}
.footer-icp { color: var(--cyan); }

/* ---------- 17. 响应式 ---------- */
@media (max-width: 1180px) {
  .brand-line { display: none; }
  .nav-list { gap: 0.5rem; }
  .nav-link { font-size: 0.86rem; }
  .nav-idx { display: none; }
    .utility-link { padding: 0.4rem 0.6rem; font-size: 0.74rem; }
}

@media (max-width: 940px) {
  :root { --header-h: 70px; }

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

  .site-header { position: sticky; }

  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: block;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    padding: 1rem var(--gutter) 1.6rem;
    background: var(--night);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 28px 60px -34px rgba(0, 0, 0, 0.95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    pointer-events: none;
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s;
  }
  .primary-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-link {
    justify-content: flex-start;
    padding: 0.9rem 0.2rem;
    font-size: 1.12rem;
    border-bottom: 1px solid var(--line);
  }
  .nav-link::after { display: none; }
  .nav-idx { display: inline; font-size: 0.68rem; }

  .utility-rail {
    margin-top: 1.1rem;
    padding-left: 0;
    border-left: 0;
    flex-wrap: wrap;
  }

  .footer-top { grid-template-columns: minmax(0, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1.6rem 1.2rem; }
}

@media (max-width: 900px) {
  .grid-3,
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: minmax(0, 1fr); }

  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-legal { flex-direction: column; align-items: flex-start; gap: 0.4rem; }
  .media-frame--wide { aspect-ratio: 16 / 10; }
}

@media (max-width: 420px) {
  .nav-toggle-text { display: none; }
}

/* ---------- 18. 减少动效 ---------- */
@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;
  }

  .reveal { opacity: 1; transform: none; }
  .tab-panel { animation: none; }
  .scroll-progress { display: none; }
}

@media print {
  .site-header,
  .site-footer,
  .to-top,
  .scroll-progress { display: none; }
  body { background: #fff; color: #111; }
}