/* ============================================================
   7娱乐会馆 · 共享站点样式 /assets/site.css
   夜色蓝图会馆：深空蓝紫地基 + 侧边轨道 + 矿物色标签
   ============================================================ */

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

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

body { margin: 0; }

h1, h2, h3, h4, p, figure, blockquote, dl, dd { margin: 0; }

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

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

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

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1026;
  --ink-2: #121B3F;
  --stone: #2C3038;
  --magenta: #FF3D8D;
  --cyan: #35F0DC;
  --gold: #F4B94E;
  --slate: #7E8AA6;
  --paper: #F5EFE4;
  --moss: #6F8F7A;
  --clay: #B56A4C;

  --line-1: rgba(245, 239, 228, 0.14);
  --line-2: rgba(245, 239, 228, 0.08);
  --paper-62: rgba(245, 239, 228, 0.62);
  --paper-70: rgba(245, 239, 228, 0.7);
  --paper-82: rgba(245, 239, 228, 0.82);

  --rail-w: 272px;
  --topbar-h: 58px;
  --edge: clamp(16px, 4vw, 40px);

  --font-display: "Noto Sans SC Display", "HarmonyOS Sans SC", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- 3. 基础排版与外壳偏移 ---------- */
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.01em;
  padding-left: var(--rail-w);
  -webkit-font-smoothing: antialiased;
}

body.is-nav-open { overflow: hidden; }

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

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 220;
  padding: 10px 18px;
  border-radius: 2px;
  background: var(--cyan);
  color: #05121a;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  transform: translateY(-170%);
  transition: transform 0.2s ease;
}

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

.site-head { position: relative; z-index: 60; }

/* ---------- 4. 侧边轨道（桌面导航） ---------- */
.rail {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--rail-w);
  z-index: 60;
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-block: 26px 20px;
  overflow-y: auto;
  overflow-x: hidden;
  background:
    linear-gradient(180deg, #121B3F 0%, #0B1026 58%, #090D1E 100%);
  border-right: 1px solid var(--line-1);
  scrollbar-width: thin;
  scrollbar-color: rgba(126, 138, 166, 0.5) transparent;
}

.rail::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(245, 239, 228, 0.05) 0 1px, transparent 1px 24px),
    repeating-linear-gradient(0deg, rgba(245, 239, 228, 0.035) 0 1px, transparent 1px 24px);
}

.rail::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 6px;
  height: 100%;
  pointer-events: none;
  background-image: repeating-linear-gradient(0deg, rgba(53, 240, 220, 0.45) 0 1px, transparent 1px 14px);
  opacity: 0.5;
}

.rail > * { position: relative; z-index: 1; }

.rail__brandmark {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  margin-inline: 20px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line-1);
}

.rail__num {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1;
  letter-spacing: 0.1em;
  padding: 7px 8px;
  color: var(--cyan);
  background: rgba(53, 240, 220, 0.08);
  border: 1px solid rgba(53, 240, 220, 0.45);
  border-radius: 2px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.rail__brandmark:hover .rail__num {
  background: rgba(53, 240, 220, 0.18);
  border-color: var(--cyan);
}

.rail__names { display: flex; flex-direction: column; gap: 5px; min-width: 0; }

.rail__name {
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--paper);
  line-height: 1.1;
}

.rail__sub {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--slate);
  line-height: 1;
}

.rail__nav { padding-inline: 12px; }

.rail__caption {
  padding-inline: 10px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.26em;
  color: var(--slate);
}

.rail__list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 2px; }

.rail__item { min-width: 0; }

.rail__link {
  position: relative;
  display: grid;
  grid-template-columns: 26px 1fr;
  align-items: baseline;
  gap: 10px;
  padding: 10px 10px 10px 12px;
  font-size: 14.5px;
  letter-spacing: 0.05em;
  color: rgba(245, 239, 228, 0.76);
  transition: color 0.18s ease, background-color 0.18s ease;
}

.rail__link::before {
  content: "";
  position: absolute;
  left: 0;
  top: 16%;
  bottom: 16%;
  width: 2px;
  background: var(--magenta);
  transform: scaleY(0);
  transform-origin: top center;
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.rail__link:hover,
.rail__link:focus-visible {
  color: var(--paper);
  background: rgba(53, 240, 220, 0.07);
}

.rail__idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--slate);
  transition: color 0.18s ease;
}

.rail__label { position: relative; display: inline-block; }

.rail__label::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -3px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease, background-color 0.22s ease;
}

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

.rail__link[aria-current="page"] {
  color: var(--paper);
  background: linear-gradient(90deg, rgba(255, 61, 141, 0.22), rgba(255, 61, 141, 0));
}

.rail__link[aria-current="page"]::before { transform: scaleY(1); }

.rail__link[aria-current="page"] .rail__idx { color: var(--magenta); }

.rail__link[aria-current="page"] .rail__label::after {
  transform: scaleX(1);
  background: var(--magenta);
}

.rail__search { padding-inline: 20px; }

.searchfield { display: block; }

.searchfield__label {
  display: block;
  margin-bottom: 7px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--slate);
}

.searchfield__input {
  width: 100%;
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--paper);
  background: rgba(245, 239, 228, 0.05);
  border: 1px solid rgba(245, 239, 228, 0.18);
  border-radius: 2px;
  transition: border-color 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.searchfield__input::placeholder { color: rgba(126, 138, 166, 0.92); }

.searchfield__input:hover { border-color: rgba(53, 240, 220, 0.5); }

.searchfield__input:focus {
  outline: none;
  border-color: var(--cyan);
  background: rgba(53, 240, 220, 0.08);
  box-shadow: 0 0 0 3px rgba(53, 240, 220, 0.16);
}

.rail__foot {
  margin-top: auto;
  padding-inline: 20px;
  padding-top: 18px;
  border-top: 1px solid var(--line-1);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.rail__status {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: rgba(245, 239, 228, 0.62);
}

.rail__dot {
  flex: none;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 3px rgba(111, 143, 122, 0.24);
}

.rail__meter { display: grid; gap: 6px; }

.rail__progress {
  height: 2px;
  border-radius: 2px;
  background: rgba(245, 239, 228, 0.14);
  overflow: hidden;
}

.rail__progressbar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--magenta));
  transition: width 0.12s linear;
}

.rail__readout {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: rgba(126, 138, 166, 0.95);
}

.rail__readoutval { color: var(--cyan); }

.rail__icp {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  color: rgba(126, 138, 166, 0.85);
}

/* ---------- 5. 移动顶栏 ---------- */
.topbar {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-h);
  z-index: 70;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-inline: 16px;
  background: rgba(11, 16, 38, 0.95);
  border-bottom: 1px solid var(--line-1);
  backdrop-filter: blur(8px);
}

.topbar__brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--paper);
}

.topbar__mark {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  padding: 4px 5px;
  border: 1px solid rgba(53, 240, 220, 0.45);
  border-radius: 2px;
  line-height: 1;
}

.navtoggle {
  flex: none;
  width: 42px;
  height: 38px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 5px;
  border: 1px solid rgba(245, 239, 228, 0.24);
  border-radius: 2px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.navtoggle:hover { border-color: var(--cyan); background: rgba(53, 240, 220, 0.1); }

.navtoggle__bar {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--paper);
  transition: background-color 0.2s ease;
}

.navtoggle:hover .navtoggle__bar { background: var(--cyan); }

[data-header][data-open] .navtoggle { border-color: var(--magenta); background: rgba(255, 61, 141, 0.14); }

[data-header][data-open] .navtoggle__bar { background: var(--magenta); }

/* ---------- 6. 抽屉与遮罩 ---------- */
.scrim {
  position: fixed;
  inset: 0;
  z-index: 80;
  background: rgba(5, 8, 20, 0.68);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.26s ease, visibility 0.26s ease;
}

[data-header][data-open] .scrim { opacity: 1; visibility: visible; }

.drawer {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  width: min(366px, 88vw);
  flex-direction: column;
  padding-block: 16px 22px;
  overflow-y: auto;
  background: linear-gradient(180deg, #121B3F 0%, #0B1026 100%);
  border-left: 1px solid rgba(53, 240, 220, 0.24);
  box-shadow: -18px 0 48px rgba(4, 7, 18, 0.6);
  transform: translateX(102%);
  visibility: hidden;
  transition: transform 0.28s cubic-bezier(0.4, 0, 0.2, 1), visibility 0.28s;
}

[data-header][data-open] .drawer { transform: none; visibility: visible; }

.drawer__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 20px 14px;
  border-bottom: 1px solid var(--line-1);
}

.drawer__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--cyan);
}

.drawer__close {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  font-size: 20px;
  line-height: 1;
  color: var(--paper);
  background: rgba(245, 239, 228, 0.06);
  border: 1px solid rgba(245, 239, 228, 0.2);
  border-radius: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.drawer__close:hover { color: var(--magenta); border-color: var(--magenta); }

.drawer__nav { padding-top: 8px; }

.drawer__list { list-style: none; margin: 0; padding: 0; }

.drawer__link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 20px;
  font-size: 16px;
  letter-spacing: 0.05em;
  color: rgba(245, 239, 228, 0.85);
  border-bottom: 1px solid var(--line-2);
  transition: color 0.18s ease, background-color 0.18s ease, box-shadow 0.18s ease;
}

.drawer__link:hover { color: var(--paper); background: rgba(53, 240, 220, 0.08); }

.drawer__link[aria-current="page"] {
  color: var(--paper);
  background: rgba(255, 61, 141, 0.16);
  box-shadow: inset 3px 0 0 var(--magenta);
}

.drawer__label { min-width: 0; }

.drawer__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.drawer__link[aria-current="page"] .drawer__idx { color: var(--magenta); }

.drawer__search { padding: 18px 20px 0; }

.drawer__search .searchfield__input { padding: 11px 12px; font-size: 14px; }

.drawer__foot {
  margin-top: auto;
  padding: 20px;
  display: grid;
  gap: 12px;
  border-top: 1px solid var(--line-1);
}

.drawer__status {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: rgba(245, 239, 228, 0.6);
}

.drawer__cta { width: 100%; justify-content: center; }

/* ---------- 7. 通用布局与排版组件 ---------- */
.container {
  width: min(1180px, 100% - 48px);
  margin-inline: auto;
}

.section { position: relative; padding-block: clamp(48px, 7vw, 96px); }

.section-head { display: grid; gap: 12px; margin-bottom: clamp(24px, 4vw, 40px); }

.section-title {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 40px);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.section-note {
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-70);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--cyan);
}

.eyebrow::before { content: ""; width: 22px; height: 1px; background: currentColor; }

.index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--magenta);
}

.rule {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, rgba(53, 240, 220, 0.55), rgba(245, 239, 228, 0.12) 42%, transparent 100%);
}

.grid { display: grid; gap: 24px; }

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }

.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.surface {
  padding: clamp(20px, 3vw, 32px);
  background: rgba(18, 27, 63, 0.74);
  border: 1px solid var(--line-1);
  border-radius: 2px;
}

/* ---------- 8. 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}

.btn--fill {
  color: #1A0310;
  background: var(--magenta);
  border-color: var(--magenta);
}

.btn--fill:hover {
  background: #FF5C9F;
  border-color: #FF5C9F;
  box-shadow: 0 0 0 4px rgba(255, 61, 141, 0.18);
}

.btn--line {
  color: var(--cyan);
  background: transparent;
  border-color: rgba(53, 240, 220, 0.55);
}

.btn--line:hover {
  background: rgba(53, 240, 220, 0.1);
  border-color: var(--cyan);
}

.btn--legacy {
  color: rgba(245, 239, 228, 0.82);
  background: rgba(126, 138, 166, 0.08);
  border: 1px dashed rgba(126, 138, 166, 0.55);
}

.btn--legacy:hover {
  color: var(--paper);
  background: rgba(126, 138, 166, 0.18);
  border-color: var(--slate);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(245, 239, 228, 0.82);
  background: rgba(245, 239, 228, 0.04);
  border: 1px solid rgba(245, 239, 228, 0.22);
  border-radius: 2px;
}

.tag--data {
  color: var(--gold);
  background: rgba(244, 185, 78, 0.1);
  border-color: rgba(244, 185, 78, 0.5);
}

.tag--legacy {
  color: var(--slate);
  background: rgba(126, 138, 166, 0.08);
  border: 1px dashed rgba(126, 138, 166, 0.5);
}

/* ---------- 9. 面包屑 / 正文栏 / 图片容器 / 数据块 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }

.breadcrumb a {
  color: var(--paper-70);
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.breadcrumb a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

.breadcrumb__sep { color: rgba(126, 138, 166, 0.7); }

.prose {
  max-width: 38em;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--paper-82);
}

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

.prose h2 {
  font-family: var(--font-display);
  font-size: clamp(21px, 2.4vw, 26px);
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--paper);
  margin-top: 1.7em;
}

.prose h3 {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--paper);
  margin-top: 1.4em;
}

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

.prose ul,
.prose ol { padding-left: 1.25em; }

.prose ul { list-style: disc; }

.prose ol { list-style: decimal; }

.prose li + li { margin-top: 0.5em; }

.prose blockquote {
  padding: 4px 0 4px 18px;
  border-left: 2px solid var(--magenta);
  color: var(--paper-70);
  font-size: 15.5px;
}

.figure { display: grid; gap: 10px; }

.figure__media {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid rgba(245, 239, 228, 0.16);
  border-radius: 2px;
  background:
    radial-gradient(120% 100% at 20% 0%, rgba(53, 240, 220, 0.16), transparent 55%),
    radial-gradient(90% 90% at 100% 100%, rgba(255, 61, 141, 0.18), transparent 60%),
    linear-gradient(150deg, #121B3F, #0B1026 55%, #1A1030);
}

.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.94) contrast(1.06);
}

.figure__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(11, 16, 38, 0) 42%, rgba(11, 16, 38, 0.66) 100%);
}

.figure__cap {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.figure--wide .figure__media { aspect-ratio: 21 / 9; }

.figure--tall .figure__media { aspect-ratio: 3 / 4; }

.figure--square .figure__media { aspect-ratio: 1 / 1; }

.stat { display: grid; gap: 4px; }

.stat__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  letter-spacing: 0.04em;
  color: var(--gold);
  line-height: 1.2;
}

.stat__label {
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--slate);
}

/* ---------- 10. 页脚 ---------- */
.site-foot {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  padding-top: clamp(48px, 6vw, 76px);
  overflow: hidden;
  color: var(--paper-82);
  background: linear-gradient(180deg, #0B1026 0%, #121B3F 52%, #0B1026 100%);
  border-top: 1px solid var(--line-1);
}

.site-foot::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-linear-gradient(90deg, rgba(245, 239, 228, 0.045) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(0deg, rgba(245, 239, 228, 0.03) 0 1px, transparent 1px 72px);
}

.foot__lattice {
  position: absolute;
  top: -32%;
  right: -12%;
  width: 66%;
  height: 180%;
  pointer-events: none;
  background:
    radial-gradient(40% 46% at 50% 50%, rgba(255, 61, 141, 0.18), transparent 72%),
    radial-gradient(30% 34% at 22% 74%, rgba(53, 240, 220, 0.12), transparent 72%);
}

.foot__inner {
  position: relative;
  z-index: 1;
  width: min(1180px, 100% - 48px);
  margin-inline: auto;
}

.foot__masthead {
  display: grid;
  gap: 14px;
  padding-bottom: clamp(26px, 4vw, 38px);
  border-bottom: 1px solid var(--line-1);
}

.foot__wordmark {
  font-family: var(--font-display);
  font-size: clamp(38px, 6.4vw, 78px);
  font-weight: 900;
  line-height: 1;
  letter-spacing: 0.12em;
  color: var(--paper);
  text-shadow: 0 0 26px rgba(53, 240, 220, 0.16);
}

.foot__tagline {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.foot__note {
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-62);
}

.foot__cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  padding-block: clamp(26px, 4vw, 38px);
  border-bottom: 1px solid var(--line-1);
}

.foot__col { min-width: 0; }

.foot__title {
  position: relative;
  padding-left: 15px;
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--slate);
}

.foot__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

.foot__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.foot__link {
  position: relative;
  display: inline-block;
  padding-bottom: 2px;
  font-size: 14.5px;
  letter-spacing: 0.04em;
  color: var(--paper-82);
  transition: color 0.18s ease;
}

.foot__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.22s ease;
}

.foot__link:hover { color: var(--cyan); }

.foot__link:hover::after { transform: scaleX(1); }

.foot__contact {
  display: grid;
  gap: 10px;
  padding-block: clamp(24px, 3.4vw, 34px);
}

.foot__contactline {
  font-size: 14px;
  line-height: 1.8;
  color: var(--paper-70);
  word-break: break-word;
}

.foot__key {
  display: inline-block;
  min-width: 76px;
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.foot__hint {
  max-width: 52ch;
  padding-left: 1px;
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(126, 138, 166, 0.95);
  border-left: 2px dashed rgba(126, 138, 166, 0.45);
  padding-left: 12px;
}

.foot__base {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line-1);
  background: rgba(5, 8, 20, 0.42);
}

.foot__baseinner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-block: 20px;
}

.foot__legal,
.foot__copy {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: rgba(126, 138, 166, 0.95);
}

.foot__year { color: var(--paper-70); }

/* ---------- 11. 响应式 ---------- */
@media (max-width: 1279px) {
  :root { --rail-w: 244px; }
}

@media (max-width: 1099px) {
  body {
    padding-left: 0;
    padding-top: var(--topbar-h);
  }

  html { scroll-padding-top: calc(var(--topbar-h) + 12px); }

  .rail { display: none; }

  .topbar { display: flex; }

  .drawer { display: flex; }
}

@media (max-width: 960px) {
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 860px) {
  .grid--2,
  .grid--3 { grid-template-columns: minmax(0, 1fr); }

  .container,
  .foot__inner { width: min(1180px, 100% - 32px); }
}

@media (max-width: 760px) {
  .foot__cols {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 26px;
  }
}

@media (max-width: 520px) {
  body { font-size: 15.5px; }

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

  .foot__key { display: block; min-width: 0; margin-right: 0; margin-bottom: 2px; }

  .btn { width: 100%; justify-content: center; }

  .drawer__cta { width: 100%; }
}

@media (max-width: 400px) {
  .container,
  .foot__inner { width: min(1180px, 100% - 24px); }
}

/* ---------- 12. 无障碍：减弱动态 ---------- */
@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;
  }

  .rail__progressbar { transition: none; }
}