/* ==========================================================================
   小鸟体育入口 · 共享样式 /assets/site.css
   命令栏 + 数据室配色 + 纸张叠层 + 目录型导航
   ========================================================================== */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--cmd-h) + 20px);
}

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

ul[class], ol[class] { list-style: none; padding: 0; }

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

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

a { color: inherit; }

table { border-collapse: collapse; }

/* ---------- 2. Tokens ---------- */
:root {
  --green: #00A86B;
  --green-deep: #00784D;
  --green-light: #35D89E;
  --ink-blue: #0B1F3A;
  --ink-blue-2: #16325C;
  --fluoro: #E8FF3A;
  --fluoro-hot: #F3FF7A;
  --cinnabar: #D94F2B;
  --indigo: #2B2D6E;
  --wine: #6B1F3A;
  --paper: #F5F2E9;
  --paper-2: #EDE8DA;
  --ink: #101820;
  --slate: #5B6B7C;

  --line: rgba(16, 24, 32, 0.14);
  --line-soft: rgba(16, 24, 32, 0.08);
  --line-dark: rgba(245, 242, 233, 0.16);

  --cmd-h: 56px;
  --rail: 88px;
  --wrap: 1360px;
  --pad: clamp(16px, 3vw, 40px);

  --ease: cubic-bezier(0.2, 0.7, 0.2, 1);
  --t: 200ms;
  --t-slow: 320ms;

  --focus: #00784D;
  --focus-dark: #E8FF3A;

  --font-cn: "PingFang SC", "Hiragino Sans GB", "Source Han Sans SC",
    "Noto Sans CJK SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: ui-monospace, "IBM Plex Mono", SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", monospace;
}

/* ---------- 3. Base ---------- */
body {
  font-family: var(--font-cn);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--paper);
  background-image: radial-gradient(rgba(16, 24, 32, 0.045) 1px, transparent 1px);
  background-size: 4px 4px;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  line-height: 1.25;
  letter-spacing: -0.02em;
  font-weight: 800;
}

h1 { font-size: clamp(30px, 4.2vw, 56px); font-weight: 900; }
h2 { font-size: clamp(24px, 2.8vw, 34px); }
h3 { font-size: clamp(18px, 1.8vw, 22px); }

strong, b { font-weight: 800; }

::selection { background: var(--fluoro); color: var(--ink); }

.num,
.data-table td.num,
.brand__ver,
.footer-icp,
.cmd-index__num,
.cmd-index__route,
.sec-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

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

.site-header :focus-visible,
.site-footer :focus-visible {
  outline-color: var(--focus-dark);
}

/* ---------- 4. 布局工具 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: clamp(36px, 5vw, 76px); }
.section--tight { padding-block: clamp(20px, 3vw, 40px); }
.section--dark { background: var(--ink-blue); color: var(--paper); }
.section--indigo { background: var(--indigo); color: var(--paper); }
.section--wine { background: var(--wine); color: var(--paper); }

.prose { max-width: 38em; }
.prose p + p { margin-top: 0.9em; }

.grid { display: grid; gap: clamp(16px, 2vw, 24px); }
.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)); }

@media (min-width: 1025px) {
  .grid--stagger > :nth-child(3n + 2) { margin-top: 8px; }
  .grid--stagger > :nth-child(3n + 3) { margin-top: 16px; }
}

/* ---------- 5. 命令栏头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
}

.skip-link {
  position: absolute;
  left: 16px;
  top: 8px;
  z-index: 120;
  padding: 8px 14px;
  background: var(--fluoro);
  color: var(--ink);
  font-size: 13px;
  font-weight: 800;
  border-radius: 2px;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform var(--t) var(--ease);
}

.skip-link:focus,
.skip-link:focus-visible {
  transform: translateY(0);
  outline: 2px solid var(--ink-blue);
  outline-offset: 2px;
}

.cmdbar {
  position: relative;
  background: var(--ink-blue);
  color: var(--paper);
  border-bottom: 1px solid var(--line-dark);
  box-shadow: 0 10px 30px rgba(11, 31, 58, 0.2);
}

.cmdbar::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
    112deg,
    rgba(245, 242, 233, 0.05) 0 1px,
    transparent 1px 52px
  );
}

.cmdbar__inner {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.8vw, 26px);
  min-height: var(--cmd-h);
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--pad);
}

/* 品牌 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  padding: 6px 0;
  text-decoration: none;
  color: var(--paper);
}

.brand__mark {
  position: relative;
  flex: 0 0 auto;
  width: 28px;
  height: 28px;
  border-radius: 2px;
  background: var(--green);
  transform: rotate(-6deg);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.18);
  transition: transform var(--t) var(--ease);
}

.brand__mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 5px;
  background: var(--fluoro);
}

.brand:hover .brand__mark { transform: rotate(0deg); }

.brand__text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  line-height: 1.15;
}

.brand__row {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.brand__name {
  font-size: 17px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand__ver {
  font-size: 10px;
  letter-spacing: 0.06em;
  color: var(--fluoro);
  border: 1px solid rgba(232, 255, 58, 0.45);
  border-radius: 2px;
  padding: 0 5px;
  line-height: 1.5;
}

.brand__line {
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: rgba(245, 242, 233, 0.6);
}

/* 导航 */
.cmdbar__nav {
  display: flex;
  align-items: center;
  min-width: 0;
}

.cmdbar__list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px;
  border-radius: 2px;
  font-size: 13px;
  letter-spacing: 0.1em;
  font-weight: 600;
  color: rgba(245, 242, 233, 0.74);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--t) var(--ease), color var(--t) var(--ease);
}

.nav-link:hover {
  color: var(--paper);
  background: rgba(245, 242, 233, 0.1);
}

.nav-link:active { background: rgba(245, 242, 233, 0.18); }

.nav-link[aria-current="page"] {
  background: var(--green);
  color: #04170F;
  font-weight: 800;
  box-shadow: inset 0 -2px 0 0 var(--fluoro);
}

.nav-link--anchor::before {
  content: "";
  flex: 0 0 auto;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--fluoro);
}

.nav-link--anchor[aria-current="page"]::before { background: #04170F; }

/* 动作区 */
.cmdbar__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 14px;
  border-radius: 2px;
  border: 1px solid transparent;
  background: transparent;
  color: inherit;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--t) var(--ease), border-color var(--t) var(--ease),
    color var(--t) var(--ease), transform var(--t) var(--ease);
}

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

.btn--primary {
  background: var(--fluoro);
  border-color: var(--fluoro);
  color: var(--ink);
  font-weight: 800;
}

.btn--primary:hover {
  background: var(--fluoro-hot);
  border-color: var(--fluoro-hot);
}

.btn--ghost {
  border-color: rgba(245, 242, 233, 0.35);
  color: var(--paper);
}

.btn--ghost:hover {
  background: rgba(245, 242, 233, 0.1);
  border-color: var(--paper);
}

.btn--green {
  background: var(--green);
  border-color: var(--green);
  color: #04170F;
  font-weight: 800;
}

.btn--green:hover { background: var(--green-deep); border-color: var(--green-deep); color: var(--paper); }

.btn--ink {
  background: var(--ink-blue);
  border-color: var(--ink-blue);
  color: var(--paper);
  font-weight: 700;
}

.btn--ink:hover { background: var(--ink-blue-2); border-color: var(--ink-blue-2); }

.btn--sm { padding: 6px 10px; font-size: 12px; }
.btn--block { display: flex; width: 100%; }

.keybtn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 9px;
  background: transparent;
  border: 1px solid rgba(245, 242, 233, 0.22);
  border-radius: 2px;
  color: rgba(245, 242, 233, 0.7);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: border-color var(--t), color var(--t), background var(--t);
}

.keybtn kbd {
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  border: 1px solid currentColor;
  border-radius: 2px;
  padding: 0 4px;
}

.keybtn:hover,
.keybtn[aria-expanded="true"] {
  border-color: var(--fluoro);
  color: var(--fluoro);
  background: rgba(232, 255, 58, 0.08);
}

/* 移动导航按钮 */
.navbtn {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 38px;
  height: 34px;
  margin-left: auto;
  padding: 0;
  background: transparent;
  border: 1px solid rgba(245, 242, 233, 0.3);
  border-radius: 2px;
  cursor: pointer;
}

.navbtn span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--paper);
  transition: transform var(--t) var(--ease), opacity var(--t) var(--ease);
}

.navbtn[aria-expanded="true"] span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.navbtn[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.navbtn[aria-expanded="true"] span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* 站内索引浮层 */
.cmd-index {
  position: absolute;
  z-index: 90;
  top: calc(100% + 10px);
  right: max(var(--pad), calc((100% - var(--wrap)) / 2 + var(--pad)));
  width: min(620px, calc(100vw - 32px));
  padding: 20px 20px 18px;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid rgba(16, 24, 32, 0.2);
  box-shadow: 0 24px 60px rgba(11, 31, 58, 0.38), 8px 8px 0 rgba(0, 0, 0, 0.12);
}

.cmd-index[hidden] { display: none; }

.cmd-index::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--green) 0 34%,
    var(--fluoro) 34% 48%,
    var(--cinnabar) 48% 62%,
    var(--indigo) 62% 100%
  );
}

.cmd-index__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.cmd-index__title {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.cmd-index__hint {
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.cmd-index__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.cmd-index__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 8px;
  border-radius: 2px;
  color: var(--ink);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background var(--t), color var(--t);
}

.cmd-index__link:hover,
.cmd-index__link:focus-visible {
  background: rgba(0, 168, 107, 0.12);
  color: var(--green-deep);
}

.cmd-index__num {
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--green-deep);
}

.cmd-index__route {
  margin-left: auto;
  font-size: 11px;
  letter-spacing: 0.02em;
  color: var(--slate);
}

/* 滚动进度 */
.progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  pointer-events: none;
}

.progress__bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--green), var(--fluoro));
  transition: width 120ms linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 8vw, 96px);
  background: var(--ink-blue);
  color: var(--paper);
  overflow: hidden;
}

.site-footer::before {
  content: "";
  display: block;
  height: 5px;
  background: linear-gradient(
    90deg,
    var(--green) 0 30%,
    var(--fluoro) 30% 42%,
    var(--cinnabar) 42% 54%,
    var(--indigo) 54% 78%,
    var(--wine) 78% 100%
  );
}

.site-footer::after {
  content: "";
  position: absolute;
  inset: 5px 0 0 0;
  z-index: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(
      115deg,
      rgba(245, 242, 233, 0.05) 0 1px,
      transparent 1px 64px
    ),
    radial-gradient(rgba(245, 242, 233, 0.07) 1px, transparent 1px);
  background-size: auto, 6px 6px;
}

.site-footer__inner {
  position: relative;
  z-index: 1;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: clamp(32px, 5vw, 56px) var(--pad) 0;
}

.footer-main {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 1.7fr);
  gap: clamp(28px, 4vw, 56px);
  padding-bottom: clamp(24px, 3vw, 36px);
  border-bottom: 1px solid var(--line-dark);
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.brand--footer { padding: 0; }
.brand--footer .brand__name { font-size: 19px; }
.brand--footer .brand__mark { width: 32px; height: 32px; }

.footer-tagline {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(245, 242, 233, 0.84);
  max-width: 26ch;
}

.footer-stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  transform: rotate(-2deg);
  background: var(--wine);
  border: 1px solid rgba(245, 242, 233, 0.35);
  color: var(--paper);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.footer-contact {
  display: grid;
  gap: 6px;
  font-size: 13.5px;
  color: rgba(245, 242, 233, 0.82);
}

.footer-contact__row {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.footer-contact__key {
  flex: 0 0 auto;
  width: 32px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--green-light);
}

.footer-contact__value {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.01em;
  word-break: break-word;
}

.footer-hours {
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(245, 242, 233, 0.6);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px 20px;
}

.footer-col__title {
  margin-bottom: 12px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.2em;
  color: rgba(245, 242, 233, 0.62);
}

.footer-col__list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-link {
  display: inline-block;
  padding: 2px 0;
  font-size: 14px;
  color: rgba(245, 242, 233, 0.86);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--t), border-color var(--t);
}

.footer-link:hover,
.footer-link:focus-visible {
  color: var(--fluoro);
  border-bottom-color: var(--fluoro);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-dark);
}

.footer-legal__note {
  max-width: 58ch;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(245, 242, 233, 0.62);
}

.footer-legal__links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}

.footer-legal__links .footer-link { font-size: 13px; }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding: 16px 0 28px;
  font-size: 12px;
  color: rgba(245, 242, 233, 0.6);
}

.footer-copy { letter-spacing: 0.04em; }

.footer-icp {
  padding: 2px 8px;
  border: 1px solid rgba(245, 242, 233, 0.24);
  border-radius: 2px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
}

.footer-note {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: rgba(245, 242, 233, 0.5);
}

/* ---------- 7. 通用内容组件 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate);
}

.crumbs a {
  color: var(--slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.crumbs a:hover { color: var(--green-deep); border-bottom-color: currentColor; }

.crumbs__sep { color: rgba(16, 24, 32, 0.3); }

.crumbs [aria-current="page"] { color: var(--ink); font-weight: 800; }

.sec-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px 24px;
  margin-bottom: clamp(18px, 2.4vw, 30px);
}

.sec-head__main {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.sec-num {
  padding: 2px 6px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--green-deep);
  border: 1px solid currentColor;
  border-radius: 2px;
}

.section--dark .sec-num,
.section--indigo .sec-num,
.section--wine .sec-num {
  color: var(--fluoro);
}

.sec-title {
  font-size: clamp(22px, 2.4vw, 32px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

.sec-desc {
  max-width: 38ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.section--dark .sec-desc,
.section--indigo .sec-desc,
.section--wine .sec-desc { color: rgba(245, 242, 233, 0.72); }

.note-v {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--slate);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  border: 1px solid currentColor;
  border-radius: 2px;
  line-height: 1.5;
}

.tag--green { color: var(--green-deep); background: rgba(0, 168, 107, 0.1); }
.tag--fluoro { color: var(--ink); background: var(--fluoro); border-color: var(--fluoro); }
.tag--wine { color: var(--paper); background: var(--wine); border-color: var(--wine); }
.tag--live { color: #1A0700; background: var(--cinnabar); border-color: var(--cinnabar); }

.card {
  padding: clamp(16px, 2vw, 24px);
  background: #FFFFFF;
  border: 1px solid var(--line);
  border-radius: 2px;
  box-shadow: 0 1px 0 rgba(16, 24, 32, 0.04), 8px 8px 0 rgba(11, 31, 58, 0.06);
}

.card--dark {
  background: var(--ink-blue-2);
  color: var(--paper);
  border-color: var(--line-dark);
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.2), 8px 8px 0 rgba(0, 0, 0, 0.18);
}

.card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--slate);
}

.card--dark .card__meta { color: rgba(245, 242, 233, 0.6); }

.card__title {
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.card__text {
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

.card--dark .card__text { color: rgba(245, 242, 233, 0.76); }

/* 图片容器基础规则（页面阶段放入 <img> 即可） */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: var(--ink-blue-2);
  border: 1px solid var(--line);
  border-radius: 2px;
}

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

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--wide { aspect-ratio: 21 / 9; }

.media__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 12px;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: rgba(245, 242, 233, 0.45);
  background-image: repeating-linear-gradient(
      135deg,
      rgba(245, 242, 233, 0.06) 0 2px,
      transparent 2px 14px
    ),
    radial-gradient(rgba(245, 242, 233, 0.1) 1px, transparent 1px);
  background-size: auto, 7px 7px;
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 8px 10px;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--paper);
  background: linear-gradient(to top, rgba(11, 31, 58, 0.88), transparent);
}

.media__tag {
  position: absolute;
  top: 10px;
  left: 10px;
}

/* 数据表 */
.data-table {
  width: 100%;
  font-size: 14px;
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

.data-table th {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.14em;
  color: var(--slate);
  background: rgba(11, 31, 58, 0.04);
}

.data-table td.num { text-align: right; }

/* 标签页 */
.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--line);
}

.tabs__btn {
  appearance: none;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid transparent;
  border-bottom: none;
  border-radius: 2px 2px 0 0;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--slate);
  cursor: pointer;
  transition: background var(--t), color var(--t);
}

.tabs__btn:hover { color: var(--ink); background: rgba(11, 31, 58, 0.05); }

.tabs__btn[aria-selected="true"] {
  color: var(--ink);
  background: var(--fluoro);
  border-color: rgba(16, 24, 32, 0.16);
  box-shadow: inset 0 2px 0 0 var(--green);
}

.tabs__panel { padding-top: 18px; }
.tabs__panel[hidden] { display: none; }

/* 时间轴基线 */
.timeline {
  position: relative;
  display: grid;
  gap: 18px;
  padding-left: 22px;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--green) 0 8px,
    transparent 8px 14px
  );
}

.timeline__item { position: relative; }

.timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 8px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--green);
  border-radius: 50%;
  background: var(--paper);
}

/* 返回顶部（JS 注入） */
.to-top {
  position: fixed;
  right: clamp(14px, 2vw, 28px);
  bottom: clamp(14px, 2vw, 28px);
  z-index: 70;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--ink-blue);
  color: var(--paper);
  border: 1px solid rgba(245, 242, 233, 0.24);
  border-radius: 2px;
  font-size: 12px;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(11, 31, 58, 0.32);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity var(--t) var(--ease), transform var(--t) var(--ease),
    background var(--t);
}

.to-top[data-visible] {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.to-top:hover { background: var(--ink-blue-2); }

.to-top__chapter {
  max-width: 18ch;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: var(--fluoro);
  font-weight: 700;
}

.to-top__arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fluoro);
}

/* 进入视口的显现（需 html.js） */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 240ms var(--ease), transform 240ms var(--ease);
}

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

/* ---------- 8. 响应式 ---------- */
@media (max-width: 1180px) {
  .brand__line { display: none; }
}

@media (max-width: 1080px) {
  .navbtn { display: inline-flex; }

  .cmdbar__nav { display: none; }

  .cmdbar__nav[data-open] {
    display: block;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    z-index: 85;
    padding: 10px var(--pad) 16px;
    background: var(--ink-blue-2);
    border-top: 1px solid var(--line-dark);
    border-bottom: 3px solid var(--green);
    box-shadow: 0 20px 44px rgba(11, 31, 58, 0.42);
  }

  .cmdbar__nav[data-open] .cmdbar__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .cmdbar__nav[data-open] .nav-link {
    padding: 12px 10px;
    font-size: 14px;
    letter-spacing: 0.08em;
  }

  .cmdbar__nav[data-open] .nav-link[aria-current="page"] {
    box-shadow: inset 3px 0 0 0 var(--fluoro);
  }

  .cmdbar__actions { margin-left: auto; }
  .cmdbar__actions .btn--ghost { display: none; }

  .footer-main { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 720px) {
  .keybtn { display: none; }
  .brand__ver { display: none; }
  .brand__name { font-size: 16px; }
  .cmdbar__actions .btn--primary { padding: 8px 10px; font-size: 12px; }

  .cmdbar__nav[data-open] { padding-inline: 14px; }

  .cmd-index { right: 14px; left: 14px; width: auto; }
  .cmd-index__list { grid-template-columns: 1fr; }

  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .footer-cols { grid-template-columns: 1fr; gap: 20px; }
  .footer-note { margin-left: 0; }
  .footer-legal { flex-direction: column; align-items: flex-start; }
  .to-top { padding: 9px 12px; font-size: 11.5px; }
  .to-top__chapter { max-width: 12ch; }
}

/* ---------- 9. 动效与无障碍 ---------- */
@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;
  }

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

  .grid--stagger > * { margin-top: 0 !important; }
}