/* ==========================================================================
   贝博体育官网 · 共享站点样式 /assets/site.css
   深色赛场控制台基调：夜空幕布 + 霓虹青绿 + 活力橙
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  background-color: #070B12;
  background-image:
    radial-gradient(900px 520px at 82% -8%, rgba(0, 229, 168, 0.10), transparent 62%),
    radial-gradient(760px 480px at 4% 8%, rgba(77, 141, 255, 0.10), transparent 60%),
    radial-gradient(620px 420px at 60% 108%, rgba(255, 107, 44, 0.08), transparent 62%),
    repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(90deg, rgba(255, 255, 255, 0.022) 0 1px, transparent 1px 72px);
  background-repeat: no-repeat, no-repeat, no-repeat, repeat, repeat;
}

body {
  margin: 0;
  background: transparent;
  color: #C7D0DC;
  font-family: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  overflow-x: hidden;
}

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%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
[hidden] { display: none !important; }
table { border-collapse: collapse; width: 100%; }

:focus-visible {
  outline: 2px solid #00E5A8;
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #070B12;
  --panel: #0E1522;
  --panel-2: #121A29;
  --neon: #00E5A8;
  --orange: #FF6B2C;
  --blue: #4D8DFF;
  --amber: #FFC24B;
  --gray: #8A97A8;
  --fog: #C7D0DC;
  --white: #F4F8FC;
  --line: rgba(255, 255, 255, 0.12);
  --line-strong: rgba(255, 255, 255, 0.24);
  --shadow-1: 0 1px 0 rgba(255, 255, 255, 0.03), 0 12px 30px rgba(0, 0, 0, 0.45);
  --shadow-2: 0 2px 0 rgba(255, 255, 255, 0.05), 0 22px 48px rgba(0, 0, 0, 0.58);
  --radius-sm: 8px;
  --radius: 14px;
  --radius-lg: 20px;
  --shell: 1240px;
  --gutter: clamp(18px, 4vw, 48px);
  --font-sans: "Source Han Sans SC", "Noto Sans SC", "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  --t-fast: 180ms;
  --t-mid: 280ms;
  --t-slow: 420ms;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 排版 ---------- */
h1, h2, h3, h4 {
  color: var(--white);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2.4rem, 6vw, 5.4rem); font-weight: 900; }
h2 { font-size: clamp(1.6rem, 3vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.5rem); }
h4 { font-size: 1.05rem; }

.mono, time, code, kbd {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--neon);
}

.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.lede {
  font-size: clamp(1.02rem, 1.25vw, 1.15rem);
  color: var(--white);
  line-height: 1.7;
  max-width: 34em;
}

.prose { max-width: 38em; }
.prose p + p { margin-top: 1em; }
.prose a { color: var(--blue); border-bottom: 1px solid rgba(77, 141, 255, 0.45); }
.prose a:hover { color: var(--neon); border-bottom-color: var(--neon); }
.prose strong { color: var(--white); }

/* ---------- 4. 布局骨架 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(40px, 6vw, 84px); }
.section--tight { padding-block: clamp(26px, 3.5vw, 48px); }

.stack { display: grid; gap: clamp(14px, 2vw, 24px); }
.stack--loose { gap: clamp(24px, 4vw, 48px); }

.grid { display: grid; gap: clamp(14px, 2.4vw, 26px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.split {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: center;
}

.rail {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
}

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

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

/* ---------- 5. 编号章节体系 ---------- */
.chapter {
  position: relative;
  padding-block: clamp(36px, 5.5vw, 76px);
  scroll-margin-top: 150px;
}

.chapter__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.55fr);
  gap: clamp(16px, 4vw, 56px);
  align-items: end;
  border-top: 1px solid var(--line);
  padding-top: clamp(16px, 2vw, 26px);
}

.chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 7vw, 5rem);
  font-weight: 600;
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: rgba(0, 229, 168, 0.16);
  -webkit-text-stroke: 1px rgba(0, 229, 168, 0.6);
}

.chapter__title { margin-top: 10px; }
.chapter__note {
  font-size: 14px;
  color: var(--gray);
  max-width: 30em;
}

@media (max-width: 760px) {
  .chapter__head { grid-template-columns: minmax(0, 1fr); align-items: start; }
}

/* ---------- 6. 面板 ---------- */
.panel {
  position: relative;
  background-image: linear-gradient(180deg, rgba(255, 255, 255, 0.028), rgba(255, 255, 255, 0));
  background-color: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(16px, 2.4vw, 28px);
  box-shadow: var(--shadow-1);
  transition: transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}

.panel--dense { padding: clamp(12px, 1.6vw, 18px); }

a.panel:hover,
.panel--hover:hover {
  transform: translateY(-2px);
  border-color: rgba(0, 229, 168, 0.45);
  box-shadow: var(--shadow-2);
}

.panel__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  margin-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.panel__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  letter-spacing: 0.02em;
}

.panel__body { font-size: 15px; }

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: rgba(255, 255, 255, 0.03);
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.btn:hover {
  transform: translateY(-2px);
  border-color: var(--neon);
  background: rgba(0, 229, 168, 0.08);
}

.btn--sm { padding: 9px 18px; font-size: 14px; }

.btn--primary {
  background: var(--neon);
  color: #04140F;
  border-color: transparent;
  box-shadow: 0 0 0 1px rgba(0, 229, 168, 0.4), 0 14px 30px rgba(0, 229, 168, 0.16);
}

.btn--primary:hover {
  background: #3BFFC1;
  color: #04140F;
  border-color: transparent;
}

.btn--accent {
  background: var(--orange);
  color: #1A0A02;
  border-color: transparent;
}

.btn--accent:hover {
  background: #FF8752;
  border-color: transparent;
}

.btn--ghost:hover { color: var(--white); }

/* ---------- 8. 标签与状态 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--fog);
  white-space: nowrap;
}

.tag--neon { color: var(--neon); border-color: rgba(0, 229, 168, 0.42); background: rgba(0, 229, 168, 0.09); }
.tag--orange { color: var(--orange); border-color: rgba(255, 107, 44, 0.45); background: rgba(255, 107, 44, 0.1); }
.tag--blue { color: var(--blue); border-color: rgba(77, 141, 255, 0.45); background: rgba(77, 141, 255, 0.1); }
.tag--amber { color: var(--amber); border-color: rgba(255, 194, 75, 0.45); background: rgba(255, 194, 75, 0.1); }

.stat {
  border-left: 2px solid var(--neon);
  padding-left: 14px;
}

.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 600;
  line-height: 1.1;
  color: var(--white);
  letter-spacing: -0.02em;
}

.stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

/* ---------- 9. 索引列表 ---------- */
.list-index { border-top: 1px solid var(--line); }

.list-index__item {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr) auto;
  gap: 16px;
  align-items: center;
  padding: 16px 8px 16px 0;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.list-index__item:hover {
  background: rgba(0, 229, 168, 0.05);
  padding-left: 10px;
}

.list-index__num {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gray);
  letter-spacing: 0.06em;
}

@media (max-width: 620px) {
  .list-index__item { grid-template-columns: 44px minmax(0, 1fr); }
}

/* ---------- 10. 媒体容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background-color: var(--panel);
  background-image: linear-gradient(135deg, rgba(0, 229, 168, 0.12), rgba(77, 141, 255, 0.08) 46%, rgba(255, 107, 44, 0.14));
  box-shadow: var(--shadow-1);
}

.media-frame img,
.media-frame svg { width: 100%; height: 100%; object-fit: cover; }

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.03) 0 1px, transparent 1px 9px);
}

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

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--fog);
  background: linear-gradient(180deg, rgba(7, 11, 18, 0), rgba(7, 11, 18, 0.9));
}

/* ---------- 11. 面包屑 ---------- */
.crumbs {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li::after { content: "/"; color: rgba(255, 255, 255, 0.22); }
.crumbs li:last-child::after { content: ""; }
.crumbs a:hover { color: var(--neon); }
.crumbs [aria-current="page"] { color: var(--fog); }

/* ---------- 12. 标签页 ---------- */
.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--line);
}

.tabs__tab {
  padding: 10px 16px;
  border: 1px solid transparent;
  border-bottom: 2px solid transparent;
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
  font-size: 14px;
  font-weight: 600;
  color: var(--gray);
  transition: color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.tabs__tab:hover { color: var(--white); background: rgba(255, 255, 255, 0.03); }

.tabs__tab[aria-selected="true"] {
  color: var(--white);
  border-bottom-color: var(--neon);
  background: rgba(0, 229, 168, 0.07);
}

.tabs__panel { padding-top: clamp(16px, 2.4vw, 26px); }

/* ---------- 13. 折叠组 ---------- */
.acc { border-top: 1px solid var(--line); }

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

.acc__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 4px;
  text-align: left;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  color: var(--fog);
  transition: color var(--t-fast) var(--ease);
}

.acc__trigger:hover { color: var(--white); }

.acc__trigger::after {
  content: "";
  flex: none;
  width: 11px;
  height: 11px;
  margin-left: auto;
  border-right: 2px solid var(--neon);
  border-bottom: 2px solid var(--neon);
  transform: rotate(45deg);
  transition: transform var(--t-mid) var(--ease);
}

.acc__item.is-open .acc__trigger { color: var(--white); }
.acc__item.is-open .acc__trigger::after { transform: rotate(-135deg); }

.acc__panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows var(--t-mid) var(--ease);
}

.acc__item.is-open .acc__panel { grid-template-rows: 1fr; }

.acc__inner { overflow: hidden; }
.acc__inner > * { padding: 0 4px 20px; max-width: 42em; color: var(--fog); }

/* ---------- 14. 筛选芯片 ---------- */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--gray);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.chip:hover { color: var(--white); border-color: var(--line-strong); }

.chip[aria-pressed="true"] {
  color: #04140F;
  background: var(--neon);
  border-color: transparent;
}

/* ---------- 15. 显现与滚动进度 ---------- */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--t-slow) var(--ease), transform var(--t-slow) var(--ease);
}

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

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  z-index: 90;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--neon), var(--blue) 55%, var(--orange));
  pointer-events: none;
  transition: transform 90ms linear;
}

/* ---------- 16. 跳转链接 ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 120;
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--neon);
  color: #04140F;
  font-weight: 700;
  transition: top var(--t-fast) var(--ease);
}

.skip-link:focus { top: 0; }

/* ---------- 17. 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: rgba(7, 11, 18, 0.92);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom: 1px solid var(--line);
}

/* 顶部状态条 */
.topbar { border-bottom: 1px solid var(--line); }

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 36px;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.topbar__status,
.topbar__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.topbar__label { color: var(--gray); }
.topbar__value { color: var(--neon); white-space: nowrap; }
.topbar__value--dim { color: var(--fog); opacity: 0.85; }
.topbar__sep { color: rgba(255, 255, 255, 0.2); }
.topbar__tag { color: var(--fog); }
.topbar__lang { color: var(--gray); }

.pulse {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 0 rgba(0, 229, 168, 0.55);
  animation: pulse 2.4s var(--ease) infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 229, 168, 0.55); }
  70% { box-shadow: 0 0 0 8px rgba(0, 229, 168, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 229, 168, 0); }
}

/* 刊头 */
.masthead { border-bottom: 1px solid var(--line); }

.masthead__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: 16px;
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(12px, 1.8vw, 20px) var(--gutter) clamp(10px, 1.4vw, 16px);
}

.vertical-note {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--gray);
  padding-left: 6px;
  border-left: 1px solid var(--line);
  max-height: 72px;
}

.brand { justify-self: center; text-align: center; }

.brand__link {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.brand__name {
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--white);
  line-height: 1.1;
  transition: color var(--t-fast) var(--ease);
}

.brand__link:hover .brand__name { color: var(--neon); }

.brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--gray);
}

.masthead__tools {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  justify-self: end;
}

.lang-chip {
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gray);
}

.index-btn,
.nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--fog);
  background: rgba(255, 255, 255, 0.03);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease), background-color var(--t-fast) var(--ease);
}

.index-btn:hover,
.nav-btn:hover {
  color: var(--white);
  border-color: var(--neon);
  background: rgba(0, 229, 168, 0.08);
}

.index-btn__mark { color: var(--neon); font-family: var(--font-mono); }

.nav-btn { display: none; }

.nav-btn__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 15px;
}

.nav-btn__bars i {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--neon);
  border-radius: 2px;
  transition: transform var(--t-mid) var(--ease), opacity var(--t-fast) var(--ease);
}

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

/* 主导航 */
.nav {
  background-image: linear-gradient(180deg, rgba(14, 21, 34, 0.75), rgba(7, 11, 18, 0));
}

.nav__list {
  display: flex;
  justify-content: center;
  gap: clamp(6px, 2vw, 26px);
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 14px 6px;
  color: var(--fog);
  transition: color var(--t-fast) var(--ease);
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 6px;
  right: 6px;
  bottom: 0;
  height: 2px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--t-mid) var(--ease), background-color var(--t-mid) var(--ease);
}

.nav__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--gray);
  transition: color var(--t-fast) var(--ease);
}

.nav__label { font-size: 15px; font-weight: 600; letter-spacing: 0.04em; }

.nav__link:hover { color: var(--white); }
.nav__link:hover::after { transform: scaleX(1); background: var(--line-strong); }

.nav__link[aria-current="page"] { color: var(--white); }
.nav__link[aria-current="page"] .nav__idx { color: var(--neon); }
.nav__link[aria-current="page"]::after { transform: scaleX(1); background: var(--neon); }

/* 站点索引面板 */
.index-panel {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  animation: indexIn var(--t-mid) var(--ease) both;
}

@keyframes indexIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

.index-panel__inner {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: clamp(16px, 3vw, 40px);
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(18px, 2.6vw, 28px) var(--gutter) clamp(20px, 3vw, 32px);
}

.index-panel__title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--neon);
  text-transform: uppercase;
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.index-panel__list { display: grid; gap: 2px; }

.index-panel__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 0;
  font-size: 14px;
  color: var(--fog);
  transition: color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.index-panel__link:hover { color: var(--neon); transform: translateX(3px); }

.index-panel__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--gray);
}

.index-panel__desc {
  font-size: 14px;
  color: var(--gray);
  margin-bottom: 14px;
  max-width: 24em;
}

/* ---------- 18. 页脚 ---------- */
.site-footer {
  margin-top: clamp(48px, 8vw, 100px);
  background: var(--panel);
  border-top: 1px solid var(--line);
}

.site-footer::before {
  content: "";
  display: block;
  height: 2px;
  background: linear-gradient(90deg, var(--neon), rgba(0, 229, 168, 0.1) 42%, rgba(255, 107, 44, 0.1) 58%, var(--orange));
}

.footer__inner {
  max-width: var(--shell);
  margin-inline: auto;
  padding: clamp(30px, 5vw, 60px) var(--gutter) clamp(20px, 3vw, 32px);
}

.footer__top {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: clamp(24px, 4vw, 56px);
  padding-bottom: clamp(22px, 3vw, 34px);
  border-bottom: 1px solid var(--line);
}

.footer__name {
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--white);
}

.footer__line {
  margin-top: 6px;
  font-size: 14px;
  color: var(--gray);
}

.footer__tag {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--neon);
}

.footer__nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 34px);
}

.footer__col-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--fog);
  padding-bottom: 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

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

.footer__link {
  font-size: 14px;
  color: var(--gray);
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.footer__link:hover {
  color: var(--neon);
  padding-left: 4px;
}

.footer__col-note {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray);
  word-break: break-all;
}

.footer__status {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(12px, 2vw, 26px);
  margin-block: clamp(20px, 3vw, 30px);
  padding: clamp(14px, 2vw, 20px);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.02);
}

.footer__status-item { display: grid; gap: 6px; }

.footer__status-key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.footer__status-value {
  font-size: 14px;
  color: var(--white);
  font-family: var(--font-mono);
}

.footer__legal {
  display: grid;
  gap: 6px;
  font-size: 13px;
  color: var(--gray);
}

.footer__icp { font-family: var(--font-mono); letter-spacing: 0.06em; }
.footer__contact { font-family: var(--font-mono); word-break: break-word; }
.footer__address { color: var(--gray); }
.footer__copy { margin-top: 8px; font-family: var(--font-mono); font-size: 12px; color: rgba(138, 151, 168, 0.8); }

/* ---------- 19. 响应式：平板与手机 ---------- */
@media (max-width: 979px) {
  .masthead__inner { grid-template-columns: minmax(0, 1fr) auto; gap: 12px; }
  .vertical-note { display: none; }
  .brand { justify-self: start; text-align: left; }
  .brand__link { align-items: flex-start; }
  .masthead__tools { justify-self: end; }
  .nav-btn { display: inline-flex; }

  .nav {
    display: grid;
    grid-template-rows: 0fr;
    background: var(--panel);
    border-top: 1px solid transparent;
    transition: grid-template-rows var(--t-mid) var(--ease), border-color var(--t-fast) var(--ease);
  }

  .nav[data-open] {
    grid-template-rows: 1fr;
    border-top-color: var(--line);
  }

  .nav__list {
    flex-direction: column;
    justify-content: flex-start;
    gap: 0;
    overflow: hidden;
    padding: 0 var(--gutter);
  }

  .nav__link {
    width: 100%;
    padding: 15px 4px;
    border-bottom: 1px solid var(--line);
  }

  .nav__link::after {
    left: 0;
    right: auto;
    width: 3px;
    height: 100%;
    top: 0;
    bottom: 0;
    transform: scaleY(0);
    transform-origin: top center;
  }

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

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

@media (max-width: 760px) {
  .topbar__label { display: none; }
  .topbar__inner { font-size: 10px; letter-spacing: 0.08em; }
  .footer__nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer__status { grid-template-columns: minmax(0, 1fr); }
}

@media (max-width: 560px) {
  .lang-chip { display: none; }
  .index-btn { padding: 8px 12px; }
  .footer__nav { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 20. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .pulse { animation: none; }
  .scroll-progress { display: none; }

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

  .panel:hover,
  a.panel:hover,
  .panel--hover:hover,
  .btn:hover { transform: none; }
}