/* ============================================================
   K1赛场 · 全站共享样式 /assets/site.css
   夜场转播底 + 荧光青描边 + 高亮橙行动点 + 纸面双材质
   ============================================================ */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body { margin: 0; }
h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }
button { background: none; border: 0; padding: 0; cursor: pointer; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }
main { display: block; }

/* ---------- tokens ---------- */
:root {
  --ink-deep: #071322;
  --deck: #0E2135;
  --line: #1B3A57;
  --line-soft: rgba(27, 58, 87, 0.55);
  --cyan: #2FE3D2;
  --orange: #FF6A2B;
  --signal: #FFC24B;
  --steel: #A9B7C6;
  --white: #E8F0F7;
  --paper: #F3E9D7;
  --paper-ink: #191410;

  --radius: 2px;
  --shell: 1280px;
  --gutter: clamp(16px, 4vw, 32px);
  --ease: 160ms cubic-bezier(0.2, 0.8, 0.2, 1);

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

/* ---------- base ---------- */
body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--white);
  background-color: var(--ink-deep);
  background-image:
    linear-gradient(90deg, rgba(27, 58, 87, 0.28) 1px, transparent 1px),
    linear-gradient(0deg, rgba(27, 58, 87, 0.28) 1px, transparent 1px);
  background-size: 72px 72px;
  background-position: center top;
  min-height: 100vh;
}
@media (min-width: 768px) { body { font-size: 17px; } }

::selection { background: var(--cyan); color: var(--ink-deep); }
:focus-visible { outline: 2px solid var(--white); outline-offset: 2px; border-radius: var(--radius); }

/* ---------- 通用排版 ---------- */
.display {
  font-size: clamp(32px, 5.2vw, 64px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: -0.02em;
  font-stretch: 92%;
}
.section-title {
  font-size: clamp(22px, 2.6vw, 32px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.lede { font-size: clamp(16px, 1.6vw, 19px); line-height: 1.7; color: #CBD8E6; max-width: 62ch; }
.prose { max-width: 68ch; color: #D6E1EC; }
.prose p + p { margin-top: 1em; }
.prose h2, .prose h3 { margin-top: 1.6em; margin-bottom: 0.5em; color: var(--white); }
.prose ul, .prose ol { margin-top: 0.8em; padding-left: 1.2em; }
.prose li { list-style: disc; margin-top: 0.4em; }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* ---------- 布局容器 ---------- */
.container {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section {
  padding: clamp(40px, 6vw, 84px) 0;
  border-top: 1px solid var(--line);
}
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 20px;
  margin-bottom: clamp(20px, 3vw, 36px);
}

/* ---------- 章节序号 ---------- */
.chapter { display: flex; align-items: flex-start; gap: 16px; }
.chapter-num {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--steel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color var(--ease), background-color var(--ease), border-color var(--ease), transform var(--ease);
}
.chapter-body { flex: 1 1 auto; min-width: 0; }
.chapter.is-active .chapter-num {
  color: var(--ink-deep);
  background: var(--cyan);
  border-color: var(--cyan);
  transform: scale(1.03);
}
@media (prefers-reduced-motion: reduce) {
  .chapter.is-active .chapter-num { transform: none; }
}

/* ---------- 左右分屏 ---------- */
.split { display: grid; gap: clamp(24px, 4vw, 48px); grid-template-columns: 1fr; }
@media (min-width: 900px) {
  .split { grid-template-columns: 34fr 66fr; }
  .split--aside-wide { grid-template-columns: 42fr 58fr; }
  .split--reverse { grid-template-columns: 66fr 34fr; }
}
.split__aside { min-width: 0; }
.split__main { min-width: 0; }

/* ---------- 网格 ---------- */
.grid-2, .grid-3, .grid-4 { display: grid; gap: 16px; grid-template-columns: 1fr; }
@media (min-width: 760px) {
  .grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1080px) {
  .grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 卡片 ---------- */
.card {
  position: relative;
  padding: 18px 20px 18px 20px;
  background: rgba(14, 33, 53, 0.66);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--ease), background-color var(--ease);
}
.card::after {
  content: "";
  position: absolute;
  right: 0;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: var(--cyan);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--ease);
}
.card:hover { border-color: #2A5170; background: rgba(14, 33, 53, 0.92); }
.card:hover::after { transform: scaleY(1); }
.card-title { font-size: 17px; font-weight: 800; line-height: 1.4; }
.card-meta {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}
.card-body { margin-top: 10px; font-size: 15px; line-height: 1.7; color: #CBD8E6; }
.card-link { margin-top: 14px; }

/* ---------- 标签 ---------- */
.tag, .chip {
  display: inline-flex;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--steel);
  background: rgba(14, 33, 53, 0.6);
}
.tag { color: var(--cyan); border-color: rgba(47, 227, 210, 0.45); background: rgba(47, 227, 210, 0.08); }
.tag--orange { color: var(--orange); border-color: rgba(255, 106, 43, 0.45); background: rgba(255, 106, 43, 0.1); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 20px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: background-color var(--ease), color var(--ease), border-color var(--ease);
}
.btn--orange { background: var(--orange); color: #160A03; border-color: var(--orange); }
.btn--orange:hover { background: #FF8351; border-color: #FF8351; }
.btn--cyan { background: transparent; color: var(--cyan); border-color: var(--cyan); }
.btn--cyan:hover { background: rgba(47, 227, 210, 0.12); }
.btn--quiet { background: transparent; color: var(--white); border-color: var(--line); }
.btn--quiet:hover { color: var(--cyan); border-color: var(--cyan); }

/* ---------- 箭头链接 ---------- */
.link-arrow {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 32px;
  font-weight: 700;
  color: var(--cyan);
}
.link-arrow::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}
.link-arrow:hover::after { transform: scaleX(1); }

/* ---------- 图片容器（页面阶段放置图片） ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  background: linear-gradient(150deg, #12283F, var(--ink-deep));
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.media img { width: 100%; height: 100%; object-fit: cover; }
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(0deg, rgba(7, 19, 34, 0.22) 0 1px, transparent 1px 4px);
  opacity: 0.55;
}
.media-frame { aspect-ratio: 16 / 9; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* ---------- 数据组 ---------- */
.stat-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
@media (min-width: 760px) { .stat-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); } }
.stat { background: var(--deck); padding: 18px; }
.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--white);
}
.stat-unit { font-family: var(--font-mono); font-size: 13px; color: var(--steel); margin-left: 4px; }
.stat-label { margin-top: 6px; font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; color: var(--steel); }

/* ---------- 表格 ---------- */
.data-table { border: 1px solid var(--line); border-radius: var(--radius); font-size: 14px; }
.data-table th, .data-table td { padding: 12px 14px; border-bottom: 1px solid var(--line); text-align: left; }
.data-table th {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--steel);
  background: rgba(14, 33, 53, 0.7);
}
.data-table tbody tr { transition: background-color var(--ease); }
.data-table tbody tr:hover { background: rgba(47, 227, 210, 0.06); }
.data-table .num { font-family: var(--font-mono); }

/* ---------- 纸面区块 ---------- */
.paper-block {
  padding: clamp(20px, 3vw, 36px);
  background: var(--paper);
  color: var(--paper-ink);
  border: 1px solid #D8C9AF;
  border-radius: var(--radius);
}
.paper-block h2, .paper-block h3 { color: var(--paper-ink); }
.paper-block p + p { margin-top: 1em; }
.paper-block a { color: #8A3A12; text-decoration: underline; text-underline-offset: 3px; }

/* ---------- 面包屑 ---------- */
.breadcrumb { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.06em; }
.breadcrumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.breadcrumb-list li { display: flex; align-items: center; gap: 8px; }
.breadcrumb-list li + li::before { content: "/"; color: var(--line); }
.breadcrumb-link { color: var(--steel); }
.breadcrumb-link:hover { color: var(--cyan); }
.breadcrumb-current { color: var(--white); }

/* ============================================================
   头部
   ============================================================ */
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 8px;
  z-index: 200;
  padding: 10px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--ink-deep);
  background: var(--cyan);
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  padding: 16px var(--gutter) 0;
}
.header-shell {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 2vw, 26px);
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 10px clamp(12px, 1.6vw, 20px);
  background: rgba(14, 33, 53, 0.86);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: padding var(--ease), background-color var(--ease), border-color var(--ease), max-width var(--ease);
}
.site-header[data-scrolled] .header-shell {
  padding-top: 6px;
  padding-bottom: 6px;
  background: rgba(7, 19, 34, 0.95);
  border-color: #2A5170;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 44px;
  flex: 0 0 auto;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 6px 8px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ink-deep);
  background: var(--cyan);
  border-radius: var(--radius);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.15; }
.brand-name { font-size: 15px; font-weight: 800; letter-spacing: 0.01em; }
.brand-line {
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--steel);
}

.nav { flex: 1 1 auto; min-width: 0; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-item { display: block; }
.nav-link {
  display: flex;
  align-items: center;
  min-height: 44px;
  padding: 0 12px;
  font-size: 14px;
  color: var(--steel);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}
.nav-link:hover { color: var(--white); border-color: var(--line); background: rgba(27, 58, 87, 0.4); }
.nav-link[aria-current="page"] {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(47, 227, 210, 0.08);
}

.header-tools { display: flex; align-items: center; gap: 8px; margin-left: auto; flex: 0 0 auto; }
.pill-link {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  border: 1px solid rgba(47, 227, 210, 0.4);
  border-radius: 999px;
  transition: color var(--ease), background-color var(--ease), border-color var(--ease);
}
.pill-link:hover { color: var(--ink-deep); background: var(--cyan); border-color: var(--cyan); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 12px;
  color: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color var(--ease), border-color var(--ease);
}
.nav-toggle:hover { color: var(--cyan); border-color: var(--cyan); }
.nav-toggle-bars { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle-bars span {
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--ease), opacity var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle-text { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.08em; }

.scroll-meter {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
  border-radius: 0 0 var(--radius) var(--radius);
}
.scroll-meter-fill {
  display: block;
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  transition: width 120ms linear;
}

/* 右侧竖排索引条 */
.rail {
  display: none;
  position: fixed;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  z-index: 70;
  flex-direction: column;
  background: rgba(7, 19, 34, 0.9);
  border: 1px solid var(--line);
  border-right: 0;
  border-radius: var(--radius) 0 0 var(--radius);
}
.rail-link {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 44px;
  padding: 18px 9px;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--steel);
  border-bottom: 1px solid var(--line);
  transition: color var(--ease), background-color var(--ease);
}
.rail-link:last-child { border-bottom: 0; }
.rail-link:hover { color: var(--cyan); background: rgba(27, 58, 87, 0.6); }
@media (min-width: 1400px) { .rail { display: flex; } }

/* 头部移动端 */
@media (max-width: 1080px) {
  .nav-toggle { display: inline-flex; }
  .nav {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 10px);
    display: none;
    flex-direction: column;
    padding: 8px;
    background: rgba(7, 19, 34, 0.98);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    max-height: 70vh;
    overflow-y: auto;
  }
  .nav[data-open] { display: flex; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav-item { width: 100%; }
  .nav-link { justify-content: space-between; padding: 12px 14px; font-size: 15px; }
  .site-header[data-scrolled] .header-shell { max-width: 100%; }
}
@media (max-width: 720px) {
  .site-header { padding-top: 10px; }
  .header-shell { gap: 8px; padding: 8px 10px; }
  .header-tools { gap: 6px; }
  .pill-link { padding: 0 9px; font-size: 11px; letter-spacing: 0.04em; }
  .brand-line { display: none; }
}
@media (max-width: 520px) {
  .brand-text { display: none; }
  .nav-toggle { padding: 0 10px; }
  .nav-toggle-text { display: none; }
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer {
  margin-top: clamp(48px, 8vw, 110px);
  padding: clamp(32px, 5vw, 64px) 0 24px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(14, 33, 53, 0.62), rgba(7, 19, 34, 1));
}
.footer-shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.footer-grid {
  display: grid;
  gap: clamp(24px, 3vw, 40px);
  grid-template-columns: 1fr;
}
@media (min-width: 760px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
}
@media (min-width: 1080px) {
  .footer-grid { grid-template-columns: 1.4fr 0.8fr 0.8fr 0.8fr 1.3fr; }
  .footer-brand { grid-column: auto; }
}
.footer-brand { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
.footer-domain {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
}
.footer-col-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  color: var(--steel);
  margin-bottom: 12px;
}
.footer-links { display: flex; flex-direction: column; gap: 2px; }
.footer-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding-right: 4px;
  font-size: 14px;
  color: #C7D4E1;
  transition: color var(--ease);
}
.footer-link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 4px;
  bottom: 8px;
  height: 1px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 180ms ease;
}
.footer-link:hover { color: var(--cyan); }
.footer-link:hover::after { transform: scaleX(1); }

.footer-contact { display: flex; flex-direction: column; }
.contact-line { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; }
.contact-line + .contact-line { margin-top: 8px; }
.contact-label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--steel);
  min-width: 40px;
}
.contact-value { font-family: var(--font-mono); font-size: 13px; color: var(--white); word-break: break-all; }
.contact-note { margin-top: 12px; font-size: 13px; line-height: 1.7; color: var(--steel); }

.footer-entry {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px 20px;
  align-items: center;
  margin-top: clamp(28px, 4vw, 48px);
  padding: 16px 18px;
  background: rgba(14, 33, 53, 0.72);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
}
.round-chips { grid-column: 1; grid-row: 1; display: flex; flex-wrap: wrap; gap: 6px; }
.round-chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: color 120ms ease, background-color 120ms ease, border-color 120ms ease;
}
.round-chip:hover { color: var(--white); border-color: #2A5170; }
.round-chip[aria-pressed="true"] {
  color: #160A03;
  background: var(--orange);
  border-color: var(--orange);
}
.round-note {
  grid-column: 1 / -1;
  grid-row: 2;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}
.footer-entry .btn { grid-column: 2; grid-row: 1; justify-self: end; }
@media (max-width: 760px) {
  .footer-entry { grid-template-columns: 1fr; }
  .round-chips, .round-note, .footer-entry .btn { grid-column: 1; grid-row: auto; }
  .footer-entry .btn { justify-self: stretch; width: 100%; }
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  justify-content: space-between;
  margin-top: clamp(28px, 4vw, 44px);
  padding-top: 18px;
  border-top: 1px solid var(--line);
}
.legal-line {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

/* ============================================================
   降级动效
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
  .card::after { transform: scaleY(1); opacity: 0.4; }
}