/* ==========================================================================
   米兰体育站 · /assets/site.css
   共享外壳：变量 / reset / 中文排版 / 头部 / 页脚 / 通用组件
   ========================================================================== */

:root {
  --color-surface: #f8f8f8;
  --color-surface-alt: #efeff0;
  --color-surface-deep: #e3e3e4;
  --color-ink: #45484f;
  --color-ink-soft: #6a6e76;
  --color-ink-muted: #7a7d85;
  --color-line: #d8d8da;
  --color-primary: #3560ca;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dde3f2;
  --color-accent: #d92659;
  --color-accent-ink: #ffffff;
  --color-highlight: #f2d2db;
  --color-focus: #d8184f;
  --color-contrast-surface: #10131b;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #3f4148;
  --color-contrast-accent: #de4470;
  --overlay-scrim: linear-gradient(180deg, rgba(16, 19, 27, 0.35) 0%, rgba(16, 19, 27, 0.72) 55%, rgba(16, 19, 27, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 14.6px;
  --text-base: 16px;
  --text-lg: 19.2px;
  --text-xl: 23.0px;
  --text-2xl: 27.6px;
  --text-3xl: 33.2px;
  --text-4xl: 39.8px;
  --text-display: clamp(34px, 5.5vw, 70px);
  --text-figure: clamp(28px, 3.9vw, 50px);
  --weight-heading: 652;
  --weight-body: 400;
  --leading-body: 1.87;
  --leading-heading: 1.28;
  --tracking-heading: 0.009em;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 4px;
  --radius-pill: 4px;
  --border-thin: 1px;
  --border-thick: 3px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1120px;
  --measure: 66ch;
  --gutter: 16px;
  --section-y: 88px;
  --section-y-lg: 123px;
}

/* --------------------------------------------------------------------------
   reset
   -------------------------------------------------------------------------- */

*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-padding-top: 92px;
}

body {
  margin: 0;
  background-color: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body.nav-open { overflow: hidden; }

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

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

a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

p { margin: 0; }

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

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

/* --------------------------------------------------------------------------
   排版工具类
   -------------------------------------------------------------------------- */

.serif-head {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
}

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

.note-text {
  font-size: var(--text-xs);
  font-style: italic;
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.mark {
  background-color: var(--color-highlight);
  color: var(--color-ink);
  padding: 0 2px;
}

.mark-under {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

/* --------------------------------------------------------------------------
   布局容器
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section {
  padding-block: var(--section-y);
  border-top: var(--border-thin) solid var(--color-line);
}

.section--lg { padding-block: var(--section-y-lg); }

.section--flush { border-top: 0; padding-top: 0; }

.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.prose > * + * { margin-top: var(--space-2); }
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-4); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-3); }
.prose ul,
.prose ol { padding-left: 1.4em; margin-block: var(--space-2); }
.prose ul { list-style: square; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 6px; }
.prose strong { font-weight: 600; color: var(--color-ink); }
.prose .note { margin-block: var(--space-3); }

/* --------------------------------------------------------------------------
   网格
   -------------------------------------------------------------------------- */

.grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.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 (max-width: 900px) {
  .grid--3,
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 620px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }
}

/* --------------------------------------------------------------------------
   跳过链接
   -------------------------------------------------------------------------- */

.skip-link {
  position: fixed;
  top: -72px;
  left: 12px;
  z-index: 300;
  padding: 10px 18px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: top .18s ease;
}

.skip-link:focus {
  top: 12px;
  text-decoration: none;
}

/* --------------------------------------------------------------------------
   头部 · 框架式导航
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.site-header__inner {
  display: flex;
  align-items: stretch;
  gap: var(--space-2);
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
  min-height: 74px;
}

@media (min-width: 1180px) {
  .site-header__inner {
    padding-inline: var(--space-3);
    border-inline: var(--border-thin) solid var(--color-line);
  }
}

/* 品牌 */

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: none;
  min-width: 0;
  padding-block: var(--space-2);
  color: var(--color-ink);
  text-decoration: none;
}

.brand:hover { text-decoration: none; }

.brand__mark {
  display: grid;
  place-items: center;
  flex: none;
  width: 36px;
  height: 36px;
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .06em;
  border-radius: var(--radius-sm);
  transition: width .2s ease, height .2s ease;
}

.brand__text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.brand__title {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-sm);
  line-height: 1.35;
  letter-spacing: var(--tracking-heading);
  white-space: nowrap;
}

.brand__sub {
  font-size: var(--text-xs);
  line-height: 1.4;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

/* 主导航 */

.site-nav {
  display: flex;
  align-items: stretch;
  min-width: 0;
  margin-left: auto;
}

.site-nav__list {
  display: flex;
  align-items: stretch;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.site-nav__item { display: flex; }

.site-nav__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 100%;
  padding: 0 11px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: var(--border-thick) solid transparent;
}

.site-nav__link:hover {
  color: var(--color-ink);
  text-decoration: none;
  border-bottom-color: var(--color-surface-deep);
}

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

.site-nav__num {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .04em;
  color: var(--color-primary);
  opacity: .55;
}

.site-nav__label { white-space: nowrap; }

.site-nav__link:hover .site-nav__num { opacity: .85; }
.site-nav__link[aria-current="page"] .site-nav__num { opacity: 1; }

/* 头部工具区 */

.site-header__utility {
  position: relative;
  z-index: 140;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: var(--space-2);
  flex: none;
}

.season-switch {
  display: flex;
  align-items: center;
  gap: 8px;
}

.season-switch__label {
  font-size: var(--text-xs);
  letter-spacing: .06em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.season-switch__seg {
  display: inline-flex;
  padding: 2px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.season-switch__btn {
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .02em;
  color: var(--color-ink-soft);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.season-switch__btn:hover { color: var(--color-ink); }

.season-switch__btn.is-active {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  color: var(--color-ink);
}

.nav-toggle__box {
  position: relative;
  display: block;
  width: 16px;
  height: 10px;
}

.nav-toggle__box::before,
.nav-toggle__box::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background-color: currentColor;
  transition: transform .2s ease, top .2s ease, bottom .2s ease;
}

.nav-toggle__box::before { top: 0; }
.nav-toggle__box::after { bottom: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__box::before {
  top: 5px;
  transform: rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__box::after {
  bottom: 4px;
  transform: rotate(-45deg);
}

.nav-toggle__text { white-space: nowrap; }

/* 阅读进度 */

.read-progress {
  position: relative;
  height: 3px;
  background-color: var(--color-surface-deep);
}

.read-progress__bar {
  position: absolute;
  inset: 0 auto 0 0;
  width: 0;
  background-color: var(--color-accent);
  transition: width .1s linear;
}

/* 滚动收窄 */

.site-header.is-condensed .site-header__inner { min-height: 56px; }
.site-header.is-condensed .brand__sub { display: none; }
.site-header.is-condensed .brand__mark { width: 28px; height: 28px; }

/* --------------------------------------------------------------------------
   头部 · 移动端抽屉
   -------------------------------------------------------------------------- */

@media (max-width: 1080px) {
  .site-header__inner { min-height: 62px; }

  .season-switch__label { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    z-index: 130;
    display: block;
    width: min(330px, 88vw);
    margin: 0;
    padding: var(--space-4) var(--space-3);
    overflow-y: auto;
    background-color: var(--color-surface);
    border-left: var(--border-thin) solid var(--color-line);
    transform: translateX(102%);
    transition: transform .26s cubic-bezier(.4, 0, .2, 1);
  }

  .site-nav[data-open] { transform: translateX(0); }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item { display: block; }

  .site-nav__link {
    height: auto;
    padding: 12px 4px 12px 10px;
    font-size: var(--text-base);
    border-bottom: var(--border-thin) solid var(--color-line);
    border-left: var(--border-thick) solid transparent;
  }

  .site-nav__link:hover { border-bottom-color: var(--color-line); }

  .site-nav__link[aria-current="page"] {
    border-bottom-color: var(--color-line);
    border-left-color: var(--color-primary);
    background-color: var(--color-primary-soft);
  }
}

@media (max-width: 560px) {
  .brand__sub { display: none; }
  .season-switch { display: none; }
}

/* --------------------------------------------------------------------------
   页脚 · 边框式收口
   -------------------------------------------------------------------------- */

.site-footer {
  margin-top: var(--section-y-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thick) solid var(--color-contrast-accent);
  font-size: var(--text-sm);
}

.footer-scale {
  height: 18px;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
  background-image: repeating-linear-gradient(
    to right,
    var(--color-contrast-line) 0 1px,
    transparent 1px 22px
  );
  background-size: 100% 10px;
  background-repeat: repeat-x;
  background-position: left bottom;
}

.site-footer__inner {
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-8) var(--gutter) var(--space-4);
}

@media (min-width: 1180px) {
  .site-footer__inner {
    padding-inline: var(--space-3);
    border-inline: var(--border-thin) solid var(--color-contrast-line);
  }
}

.footer-top {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: var(--space-4);
}

@media (max-width: 900px) {
  .footer-top { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
}

.footer-brand { display: flex; flex-direction: column; gap: 6px; }

.footer-brand__mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  background-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .06em;
  border-radius: var(--radius-sm);
}

.footer-brand__name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: var(--leading-heading);
  color: var(--color-contrast-ink);
}

.footer-brand__sub {
  font-size: var(--text-xs);
  font-style: italic;
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer-lines {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-left: var(--border-thin) solid var(--color-contrast-line);
}

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

@media (max-width: 520px) {
  .footer-lines { grid-template-columns: minmax(0, 1fr); }
}

.footer-line {
  padding: var(--space-3);
  border-right: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer-line__no {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  color: var(--color-contrast-accent);
}

.footer-line__title {
  margin-top: 6px;
  font-size: var(--text-base);
  color: var(--color-contrast-ink);
}

.footer-line__desc {
  margin-top: 6px;
  font-size: var(--text-xs);
  font-style: italic;
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 66%, transparent);
}

.footer-line__link {
  display: inline-block;
  margin-top: 12px;
  padding-bottom: 2px;
  font-size: var(--text-xs);
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-accent);
}

.footer-line__link:hover {
  text-decoration: none;
  color: color-mix(in srgb, var(--color-contrast-ink) 100%, transparent);
  border-bottom-width: var(--border-thick);
}

.footer-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.footer-meta__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  color: var(--color-contrast-accent);
}

.footer-meta__value {
  display: block;
  margin-top: 6px;
  font-size: var(--text-xs);
  line-height: 1.75;
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.footer-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: var(--space-2);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2) var(--space-3);
  margin-top: var(--space-4);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 60%, transparent);
}

.footer-bottom__sign,
.footer-bottom__year { line-height: 1.7; }

.footer-bottom__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-bottom__links a {
  color: inherit;
  text-decoration: none;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.footer-bottom__links a:hover {
  color: var(--color-contrast-ink);
  text-decoration: none;
  border-bottom-color: var(--color-contrast-accent);
}

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.4;
  color: var(--color-ink);
  text-decoration: none;
  transition: border-color .16s ease, color .16s ease, background-color .16s ease;
}

.btn:hover { text-decoration: none; border-color: var(--color-ink-muted); }

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

.btn--primary:hover { border-color: color-mix(in srgb, var(--color-primary) 70%, var(--color-contrast-surface)); }

.btn--accent {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--accent:hover { border-color: color-mix(in srgb, var(--color-accent) 70%, var(--color-contrast-surface)); }

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

.btn--on-dark {
  background-color: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.btn--on-dark:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* --------------------------------------------------------------------------
   面包屑
   -------------------------------------------------------------------------- */

.breadcrumb {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

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

.breadcrumb li + li::before {
  content: "›";
  color: var(--color-line);
  font-family: var(--font-mono);
}

.breadcrumb a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.breadcrumb a:hover { color: var(--color-primary); text-decoration: underline; }

/* --------------------------------------------------------------------------
   章节头 · 编号牌
   -------------------------------------------------------------------------- */

.chapter-head {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: var(--space-3);
  align-items: start;
  padding-block: var(--space-2) var(--space-3);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.chapter-head__no {
  display: grid;
  place-items: center;
  height: 30px;
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  border-radius: var(--radius-sm);
}

.chapter-head__eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.chapter-head__title {
  margin-top: 4px;
  font-size: var(--text-2xl);
}

.chapter-head__lead {
  margin-top: 8px;
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

@media (max-width: 620px) {
  .chapter-head {
    grid-template-columns: 44px minmax(0, 1fr);
    gap: var(--space-2);
  }
  .chapter-head__title { font-size: var(--text-xl); }
}

/* --------------------------------------------------------------------------
   目录索引
   -------------------------------------------------------------------------- */

.toc {
  padding: var(--space-2);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.toc__title {
  padding: 0 4px 8px 10px;
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .12em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.toc__list {
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.toc__link {
  display: block;
  padding: 8px 4px 8px 10px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  text-decoration: none;
  border-left: var(--border-thick) solid transparent;
  transition: background-color .16s ease, border-color .16s ease, color .16s ease;
}

.toc__link:hover { color: var(--color-ink); text-decoration: none; }

.toc__link[aria-current] {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background-color: var(--color-primary-soft);
}

/* --------------------------------------------------------------------------
   要点框 · 左侧色条
   -------------------------------------------------------------------------- */

.note {
  position: relative;
  padding: var(--space-3);
  padding-left: calc(var(--space-3) + 4px);
  background-color: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.note::before {
  content: "";
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: -1px;
  width: var(--border-thick);
  background-color: var(--color-primary);
  transform: scaleY(1);
  transform-origin: 50% 0;
  transition: transform .3s ease;
}

.js .note::before { transform: scaleY(0); }
.js .note.is-inview::before { transform: scaleY(1); }

.note__title {
  margin-bottom: 6px;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-base);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}

.note__body {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

.note--accent::before { background-color: var(--color-accent); }

.note--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.note--dark::before { background-color: var(--color-contrast-accent); }
.note--dark .note__title { color: var(--color-contrast-ink); }
.note--dark .note__body { color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent); }

/* --------------------------------------------------------------------------
   框体
   -------------------------------------------------------------------------- */

.panel {
  padding: var(--space-3);
  background-color: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
}

.panel--alt { background-color: var(--color-surface-alt); }
.panel--deep { background-color: var(--color-surface-deep); }

.panel--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.panel--dark h2,
.panel--dark h3,
.panel--dark h4 { color: var(--color-contrast-ink); }

/* --------------------------------------------------------------------------
   大数字块
   -------------------------------------------------------------------------- */

.figure {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.figure__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.figure__num {
  display: flex;
  align-items: baseline;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}

.figure__unit {
  margin-left: 6px;
  font-size: var(--text-sm);
  font-weight: var(--weight-body);
  color: var(--color-ink-muted);
}

.figure__note {
  font-size: var(--text-xs);
  font-style: italic;
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.figure--accent .figure__num { color: var(--color-accent); }

.figure--dark .figure__num { color: var(--color-contrast-ink); }
.figure--dark .figure__label { color: var(--color-contrast-accent); }
.figure--dark .figure__unit,
.figure--dark .figure__note { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }

/* --------------------------------------------------------------------------
   图片容器 · 去边直角
   -------------------------------------------------------------------------- */

.media {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-surface-deep);
  border-radius: var(--radius-sm);
}

.media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0;
}

.media--21x9 { aspect-ratio: 21 / 9; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--3x2 { aspect-ratio: 3 / 2; }
.media--1x1 { aspect-ratio: 1 / 1; }

.media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
  font-style: italic;
  line-height: 1.7;
  color: var(--color-contrast-ink);
}

.media__tag {
  position: absolute;
  top: 0;
  left: 0;
  padding: 4px 10px;
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
}

/* --------------------------------------------------------------------------
   分段控件 / 标签页
   -------------------------------------------------------------------------- */

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.tabs__btn {
  margin-bottom: -1px;
  padding: 10px 14px;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thick) solid transparent;
}

.tabs__btn:hover { color: var(--color-ink); }

.tabs__btn[aria-selected="true"] {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.tabpanel { padding-top: var(--space-3); }
.tabpanel[hidden] { display: none; }

/* --------------------------------------------------------------------------
   显现动效
   -------------------------------------------------------------------------- */

[data-reveal] { opacity: 1; }

.js [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .4s ease, transform .4s ease;
}

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

/* --------------------------------------------------------------------------
   减动效
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .js .note::before { transform: scaleY(1) !important; }
  .js [data-reveal] { opacity: 1 !important; transform: none !important; }
  .read-progress__bar { transition: none !important; }
  .site-nav { transition: none !important; }
}