/* ==========================================================================
   bsports 登录中心 · 共享样式表 /assets/site.css
   赛场数据实验室：深墨绿基底 + 荧光青数据线 + 暗金编号 + 珊瑚红预警
   ========================================================================== */

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

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

body { margin: 0; }

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

ul, ol { margin: 0; padding: 0; list-style: none; }

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

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

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

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

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

:focus { outline: none; }

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

/* 2. 变量
   -------------------------------------------------------------------------- */
:root {
  /* 色彩 */
  --ink-900: #04110E;
  --ink-800: #071A16;
  --ink-700: #0D2A23;
  --jade: #1C8E77;
  --cyan: #3BF0C4;
  --gold: #C9A227;
  --gold-lt: #E8D48A;
  --coral: #FF6A55;
  --paper: #F1F6F3;
  --mist: #8FA9A1;

  --line: rgba(143, 169, 161, 0.22);
  --line-soft: rgba(143, 169, 161, 0.12);
  --line-cyan: rgba(59, 240, 196, 0.38);

  /* 字体 */
  --font-display: "Arial Narrow", "Helvetica Neue", Helvetica, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI",
    Roboto, sans-serif;
  --font-mono: ui-monospace, "SFMono-Regular", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  /* 节拍 */
  --step: 8px;
  --rail: 180px;
  --maxw: 1320px;
  --gut: 24px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --header-h: 68px;
}

/* 3. 基础排版
   -------------------------------------------------------------------------- */
body {
  background-color: var(--ink-800);
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: 0.015em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* 精密网格底纹：只在内容之下，制造战术板质感 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 80px 80px;
  opacity: 0.45;
}

main { position: relative; z-index: 1; }

h1, h2, h3, h4 {
  font-weight: 600;
  line-height: 1.28;
  letter-spacing: 0.01em;
}

p { line-height: 1.75; }

strong { font-weight: 600; }

::selection {
  background: var(--cyan);
  color: var(--ink-900);
}

/* 4. 布局骨架
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 40px);
}

.container--narrow { max-width: 960px; }

.page-offset { padding-top: clamp(104px, 13vh, 148px); }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gut);
}

.layout-rail {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: start;
}

.hairline {
  height: 1px;
  border: 0;
  margin: 0;
  background: var(--line);
}

/* 5. 章节体系
   -------------------------------------------------------------------------- */
.section {
  position: relative;
  padding-block: clamp(56px, 9vh, 104px);
}

.section__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(16px, 3vw, 40px);
  align-items: start;
  margin-bottom: clamp(24px, 4vh, 48px);
}

.section__num {
  font-family: var(--font-mono);
  font-size: clamp(40px, 7vw, 88px);
  font-weight: 400;
  line-height: 0.9;
  letter-spacing: -0.02em;
  color: rgba(201, 162, 39, 0.16);
  -webkit-text-stroke: 1px rgba(201, 162, 39, 0.75);
  user-select: none;
}

.section__title {
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 600;
  letter-spacing: 0.01em;
}

.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--mist);
}

.exhibit-label {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  padding: 6px 10px;
  border: 1px solid var(--line-cyan);
  background: rgba(59, 240, 196, 0.05);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan);
}

/* 6. 按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: 0;
  font-family: var(--font-body);
  font-size: 13px;
  line-height: 1.4;
  letter-spacing: 0.12em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
    border-color 0.2s var(--ease);
}

.btn--primary {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-900);
}

.btn--primary:hover {
  background-color: transparent;
  color: var(--cyan);
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--line-cyan);
  color: var(--paper);
}

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

/* 7. 品牌标识
   -------------------------------------------------------------------------- */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-cyan);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.brand:hover .brand__mark {
  background-color: var(--cyan);
  color: var(--ink-900);
}

.brand__text {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.brand__name {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--paper);
}

.brand__suffix {
  padding-left: 8px;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--gold);
}

/* 8. 页头
   -------------------------------------------------------------------------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background-color: var(--cyan);
  color: var(--ink-900);
  font-size: 13px;
  letter-spacing: 0.08em;
  transform: translateY(-200%);
  transition: transform 0.2s var(--ease);
}

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

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 80;
  background-color: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.site-header.is-scrolled,
.site-header[data-open] {
  background-color: rgba(13, 42, 35, 0.94);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
}

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background-image: linear-gradient(90deg, var(--cyan), var(--gold));
  transition: width 0.1s linear;
}

.site-header__inner {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 18px clamp(16px, 4vw, 40px);
  transition: padding 0.24s var(--ease);
}

.site-header.is-scrolled .site-header__inner { padding-block: 10px; }

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(2px, 1vw, 14px);
  margin-left: clamp(8px, 2vw, 32px);
}

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0px, 0.6vw, 8px);
}

.site-nav__item { position: relative; }

.site-nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 8px 10px 10px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: rgba(241, 246, 243, 0.78);
  transition: color 0.2s var(--ease);
}

.site-nav__link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 4px;
  height: 2px;
  background-color: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.site-nav__link:hover { color: var(--gold-lt); }

.site-nav__link:hover::after { transform: scaleX(1); }

.site-nav__link[aria-current="page"] { color: var(--cyan); }

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

.site-nav__idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--gold);
  opacity: 0.85;
}

.site-nav__link[aria-current="page"] .site-nav__idx { color: var(--gold-lt); }

.site-nav__cta { display: none; }

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 8px 12px;
  border: 1px solid var(--line);
  color: var(--paper);
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

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

.nav-toggle__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.nav-toggle__bars {
  display: grid;
  gap: 5px;
}

.nav-toggle__bar {
  display: block;
  width: 20px;
  height: 1px;
  background-color: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.site-header[data-open] .nav-toggle__bar:first-child {
  transform: translateY(3px) rotate(45deg);
}

.site-header[data-open] .nav-toggle__bar:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

/* 9. 页脚
   -------------------------------------------------------------------------- */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: clamp(48px, 8vh, 96px);
  background-color: var(--ink-900);
  border-top: 1px solid var(--line);
}

.site-footer__seam {
  height: 1px;
  background-image: linear-gradient(
    90deg,
    transparent,
    var(--cyan),
    var(--gold),
    transparent
  );
  opacity: 0.6;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.5fr repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 48px);
  padding-block: clamp(48px, 7vw, 80px) clamp(32px, 4vw, 48px);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
}

.site-footer__note {
  max-width: 34ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(241, 246, 243, 0.72);
}

.site-footer__stamp {
  padding: 5px 10px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mist);
}

.footer-col__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
}

.footer-col__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.footer-col__link {
  font-size: 14px;
  color: rgba(241, 246, 243, 0.74);
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.footer-col__link:hover {
  color: var(--cyan);
  border-bottom-color: var(--line-cyan);
}

.contact-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.4fr);
  gap: clamp(16px, 3vw, 48px);
  padding-block: clamp(28px, 4vw, 40px);
  border-top: 1px solid var(--line);
}

.contact-block__title {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold);
}

.contact-block__list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contact-block__row {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: 16px;
  align-items: baseline;
  font-size: 14px;
}

.contact-block__key {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mist);
}

.contact-block__val { color: rgba(241, 246, 243, 0.9); }

.contact-block__note {
  grid-column: 1 / -1;
  max-width: 68ch;
  font-size: 13px;
  line-height: 1.8;
  color: var(--mist);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 20px;
  border-top: 1px solid var(--line);
}

.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
}

.legal-links__link {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--mist);
  transition: color 0.18s var(--ease);
}

.legal-links__link:hover { color: var(--gold-lt); }

.site-footer__icp {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.site-footer__bottom {
  padding-block: 16px 28px;
  border-top: 1px solid var(--line-soft);
}

.site-footer__copy {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(143, 169, 161, 0.85);
}

/* 10. 通用组件
   -------------------------------------------------------------------------- */

/* 面包屑 */
.breadcrumb { margin-bottom: 24px; }

.breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.breadcrumb__item::after {
  content: "/";
  color: rgba(143, 169, 161, 0.45);
}

.breadcrumb__item:last-child::after { content: none; }

.breadcrumb__link { color: var(--mist); transition: color 0.18s var(--ease); }

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

.breadcrumb__item[aria-current="page"] .breadcrumb__link { color: var(--gold-lt); }

/* 正文 */
.prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(241, 246, 243, 0.88);
}

.prose h2 {
  margin: 2.2em 0 0.6em;
  font-size: 26px;
  color: var(--paper);
}

.prose h3 {
  margin: 1.8em 0 0.5em;
  font-size: 19px;
  color: var(--gold-lt);
}

.prose p { margin-bottom: 1.1em; }

.prose ul { margin-bottom: 1.2em; }

.prose li {
  position: relative;
  padding-left: 18px;
  margin-bottom: 0.5em;
}

.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.8em;
  width: 8px;
  height: 1px;
  background-color: var(--cyan);
}

.prose a {
  color: var(--cyan);
  border-bottom: 1px solid var(--line-cyan);
}

.prose strong { color: var(--paper); }

.prose blockquote {
  margin: 1.8em 0;
  padding: 16px 20px;
  border-left: 2px solid var(--gold);
  background-color: rgba(13, 42, 35, 0.6);
  color: rgba(241, 246, 243, 0.85);
}

/* 数据卡片 */
.data-card {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  border: 1px solid var(--line);
  background-image: linear-gradient(
    160deg,
    rgba(13, 42, 35, 0.92),
    rgba(7, 26, 22, 0.92)
  );
  transition: border-color 0.2s var(--ease);
}

.data-card:hover { border-color: var(--line-cyan); }

/* 超大指标 */
.metric {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.metric__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(40px, 6vw, 88px);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.metric__value--gold { color: var(--gold); }

.metric__value--coral { color: var(--coral); }

.metric__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--mist);
}

/* 分段标签 */
.tabs { width: 100%; }

.tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--line);
}

.tabs__tab {
  position: relative;
  padding: 12px 16px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--mist);
  transition: color 0.18s var(--ease);
}

.tabs__tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background-color: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}

.tabs__tab:hover { color: var(--gold-lt); }

.tabs__tab[aria-selected="true"] { color: var(--paper); }

.tabs__tab[aria-selected="true"]::after { transform: scaleX(1); }

.tabs__panel { padding-top: 24px; }

.tabs__panel[hidden] { display: none; }

/* 数据表 */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  border: 1px solid var(--line);
  background-color: rgba(4, 17, 14, 0.5);
}

.data-table {
  min-width: 640px;
  font-size: 14px;
}

.data-table caption {
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mist);
}

.data-table th,
.data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid var(--line-soft);
}

.data-table thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background-color: var(--ink-700);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold-lt);
}

.data-table tbody tr:nth-child(even) { background-color: rgba(13, 42, 35, 0.42); }

.data-table tbody tr:hover { background-color: rgba(59, 240, 196, 0.07); }

.data-table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  text-align: right;
}

/* 折叠面板 */
.accordion { border-top: 1px solid var(--line); }

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

.accordion__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 0;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: color 0.18s var(--ease);
}

.accordion__trigger:hover { color: var(--gold-lt); }

.accordion__trigger[aria-expanded="true"] { color: var(--cyan); }

.accordion__icon {
  position: relative;
  flex: 0 0 14px;
  width: 14px;
  height: 14px;
}

.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  background-color: currentColor;
  transition: transform 0.2s var(--ease), opacity 0.2s var(--ease);
}

.accordion__icon::before {
  top: 6px;
  left: 0;
  width: 14px;
  height: 1px;
}

.accordion__icon::after {
  top: 0;
  left: 6px;
  width: 1px;
  height: 14px;
}

.accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: scaleY(0);
  opacity: 0;
}

.accordion__panel {
  padding-bottom: 20px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(241, 246, 243, 0.82);
}

.accordion__panel[hidden] { display: none; }

/* 索引轨 */
.index-rail {
  position: sticky;
  top: 104px;
  align-self: start;
  padding-left: 16px;
  border-left: 1px solid var(--line);
}

.index-rail__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.index-rail__item { position: relative; }

.index-rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
  transition: color 0.18s var(--ease);
}

.index-rail__link .idx {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--gold);
  opacity: 0.7;
}

.index-rail__link:hover { color: var(--gold-lt); }

.index-rail__link[aria-current="true"] { color: var(--cyan); }

.index-rail__link[aria-current="true"]::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background-color: var(--cyan);
}

/* 图片容器 */
.figure { margin: 0; }

.figure__media {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border: 1px solid var(--line);
  background-color: var(--ink-700);
}

.figure__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.95) contrast(1.05);
}

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

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

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

.figure__caption {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--mist);
}

/* 标记 */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 9px;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.tag--cyan { border-color: var(--line-cyan); color: var(--cyan); }

.tag--gold { border-color: rgba(201, 162, 39, 0.5); color: var(--gold-lt); }

.tag--coral { border-color: rgba(255, 106, 85, 0.5); color: var(--coral); }

/* 动效 */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s var(--ease), transform 0.4s var(--ease);
}

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

.to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 70;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-cyan);
  background-color: rgba(4, 17, 14, 0.9);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s var(--ease), visibility 0.2s var(--ease),
    background-color 0.2s var(--ease), color 0.2s var(--ease);
}

.to-top.is-visible {
  opacity: 1;
  visibility: visible;
}

.to-top:hover {
  background-color: var(--cyan);
  color: var(--ink-900);
}

/* 11. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1240px) {
  .site-header__journal { display: none; }
}

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

  .site-header__actions { display: none; }

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 24px;
    margin-left: 0;
    padding: 96px clamp(16px, 5vw, 40px) 40px;
    overflow-y: auto;
    background-color: rgba(4, 17, 14, 0.97);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease),
      visibility 0.24s var(--ease);
  }

  .site-header[data-open] .site-nav {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    border-top: 1px solid var(--line);
  }

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

  .site-nav__link {
    justify-content: flex-start;
    gap: 16px;
    padding: 18px 4px;
    font-size: 20px;
    letter-spacing: 0.04em;
    color: var(--paper);
  }

  .site-nav__link::after { display: none; }

  .site-nav__idx { font-size: 12px; }

  .site-nav__cta {
    display: inline-flex;
    align-self: flex-start;
  }
}

@media (max-width: 1024px) {
  .layout-rail { grid-template-columns: minmax(0, 1fr); }

  .index-rail {
    position: static;
    padding: 0 0 20px;
    border-left: 0;
    border-bottom: 1px solid var(--line);
    margin-bottom: 24px;
  }

  .index-rail__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 4px 20px;
  }

  .index-rail__link[aria-current="true"]::before { display: none; }

  .index-rail__link[aria-current="true"] {
    border-bottom: 2px solid var(--cyan);
  }
}

@media (max-width: 900px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }

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

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

  .section__head { grid-template-columns: minmax(0, 1fr); gap: 12px; }

  .section__num { font-size: clamp(36px, 11vw, 56px); }

  .prose { max-width: none; }
}

@media (max-width: 640px) {
  :root { --gut: 16px; }

  body { font-size: 15px; }

  .grid-12 { grid-template-columns: minmax(0, 1fr); }

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

  .site-footer__legal { flex-direction: column; align-items: flex-start; }

  .brand__suffix { display: none; }

  .contact-block__row { grid-template-columns: minmax(0, 1fr); gap: 4px; }

  .btn { padding: 10px 16px; font-size: 12px; }

  .data-table { min-width: 520px; }
}

/* 12. 动效偏好
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }

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