/* 有球体育全站 · 共享样式 /assets/site.css */

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

:root {
  --ink-900: #0E1A14;
  --ink-800: #2C4A3B;
  --ink-950: #16181A;
  --paper: #F1EAE0;
  --paper-2: #DED2C0;
  --paper-3: #FBF8F3;
  --accent: #C7F464;
  --blue: #4A90E2;
  --red: #D9452F;
  --muted: #7C8B80;
  --rule: rgba(222, 210, 192, 0.28);
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --shadow-hard: 6px 6px 0 var(--ink-950);
  --shadow-hard-sm: 4px 4px 0 var(--ink-950);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
  --t: 180ms;
  --cmd-h: 56px;
  --rail-h: 34px;
  --rail-w: 0px;
}

@media (min-width: 1024px) {
  :root { --cmd-h: 60px; --rail-h: 0px; --rail-w: 96px; }
}

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

body {
  margin: 0;
  padding-top: calc(var(--cmd-h) + var(--rail-h));
  padding-left: var(--rail-w);
  background: var(--paper);
  color: var(--ink-950);
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  font-variant-numeric: tabular-nums;
}

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

h1, h2, h3, h4 {
  margin: 0 0 0.55em;
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.18;
}
h1 { font-size: 40px; }
h2 { font-size: 28px; }
h3 { font-size: 20px; }
h4 { font-size: 16px; }

@media (max-width: 767px) {
  h1 { font-size: 30px; }
  h2 { font-size: 24px; }
  h3 { font-size: 18px; }
}

p { margin: 0 0 1em; }
ul, ol { margin: 0 0 1em; }
a { color: inherit; }
img { max-width: 100%; }
button { font: inherit; }

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

#main-content { scroll-margin-top: calc(var(--cmd-h) + var(--rail-h) + 12px); min-height: 40vh; }

.skip-link {
  position: fixed;
  top: -120px;
  left: 12px;
  z-index: 200;
  padding: 9px 14px;
  background: var(--accent);
  color: var(--ink-900);
  border: 2px solid var(--ink-950);
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: top var(--t) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 品牌侧轨 ---------- */
.site-header { position: relative; z-index: 70; }

.rail {
  position: fixed;
  top: var(--cmd-h);
  left: 0;
  right: 0;
  height: var(--rail-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 12px;
  background-color: var(--ink-900);
  background-image: repeating-linear-gradient(45deg, rgba(199, 244, 100, 0.05) 0 1px, transparent 1px 9px);
  border-bottom: 2px solid var(--ink-950);
  color: var(--paper);
  z-index: 65;
}

.rail__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--paper);
  flex: 0 0 auto;
}

.rail__mark {
  display: inline-block;
  padding: 3px 5px;
  background: var(--accent);
  color: var(--ink-900);
  border: 2px solid var(--ink-950);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.1;
}

.rail__title {
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--paper-2);
  white-space: nowrap;
}

.rail__ticks { display: none; }

.rail__tick { text-decoration: none; }

.rail__foot {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--muted);
}

.rail__dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  flex: 0 0 auto;
  background: var(--accent);
  border: 1px solid var(--ink-950);
}
.rail__dot[data-state="live"] { background: var(--blue); }
.rail__dot[data-state="warn"] { background: var(--red); }

@media (min-width: 1024px) {
  .rail {
    top: 0;
    bottom: 0;
    right: auto;
    width: var(--rail-w);
    height: auto;
    flex-direction: column;
    align-items: stretch;
    justify-content: space-between;
    gap: 18px;
    padding: 18px 8px 14px;
    border-bottom: 0;
    border-right: 2px solid var(--ink-950);
    z-index: 80;
  }
  .rail__brand { flex-direction: column; align-items: center; gap: 10px; }
  .rail__mark { font-size: 13px; padding: 5px 6px; }
  .rail__title {
    writing-mode: vertical-rl;
    font-size: 12px;
    letter-spacing: 0.24em;
    color: var(--paper-2);
    white-space: normal;
  }
  .rail__ticks {
    display: flex;
    flex: 1 1 auto;
    flex-direction: column;
    gap: 4px;
    overflow-y: auto;
  }
  .rail__tick {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    width: 100%;
    padding: 7px 4px;
    color: var(--paper-2);
    border-left: 2px solid transparent;
    transition: background var(--t) var(--ease), color var(--t) var(--ease), border-color var(--t) var(--ease);
  }
  .rail__tick:hover { background: rgba(44, 74, 59, 0.6); color: var(--accent); border-left-color: var(--accent); }
  .rail__tick[aria-current="page"] {
    background: var(--accent);
    color: var(--ink-900);
    border-left-color: var(--ink-950);
  }
  .rail__num {
    font-family: var(--font-mono);
    font-size: 10px;
    opacity: 0.75;
  }
  .rail__label {
    writing-mode: vertical-rl;
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.16em;
  }
  .rail__foot {
    flex-direction: column;
    gap: 6px;
    margin-left: 0;
    padding-top: 12px;
    border-top: 2px solid var(--ink-800);
  }
}

/* ---------- 命令栏 ---------- */
.cmdbar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: var(--cmd-h);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 12px;
  background-color: var(--ink-900);
  background-image: repeating-linear-gradient(45deg, rgba(199, 244, 100, 0.045) 0 1px, transparent 1px 9px);
  border-bottom: 2px solid var(--ink-950);
  color: var(--paper);
  z-index: 70;
}

.cmdbar__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 0 0 auto;
  text-decoration: none;
  color: var(--paper);
}

.cmdbar__mark {
  padding: 3px 6px;
  background: var(--accent);
  color: var(--ink-900);
  border: 2px solid var(--ink-950);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1.2;
}

.cmdbar__name {
  display: none;
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.cmdbar__status {
  display: none;
  align-items: center;
  gap: 7px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--paper-2);
}

.cmdbar__tools {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex: 0 0 auto;
}

.cmdbar__search {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1 1 auto;
  min-width: 0;
  height: 36px;
  padding: 0 8px;
  background: var(--paper-3);
  border: 2px solid var(--ink-950);
  transition: border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
}
.cmdbar__search:focus-within {
  border-color: var(--blue);
  box-shadow: 0 0 0 2px rgba(74, 144, 226, 0.55);
}

.cmdbar__searchkey {
  flex: 0 0 auto;
  padding: 1px 5px;
  background: var(--paper-2);
  border: 1px solid var(--ink-950);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--ink-950);
}

.cmdbar__input {
  width: 100%;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--ink-950);
  font-family: var(--font-sans);
  font-size: 13px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}
.cmdbar__input::placeholder { color: var(--muted); }
.cmdbar__input::-webkit-search-cancel-button { display: none; }

.cmdbar__season {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  padding: 7px 9px;
  color: var(--paper-2);
  border: 2px solid var(--ink-800);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  text-decoration: none;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}
.cmdbar__season:hover { color: var(--accent); border-color: var(--accent); background: rgba(44, 74, 59, 0.6); }

.cmdbar__cta { display: none; }

.cmdbar .btn--sm { box-shadow: 3px 3px 0 var(--ink-800); }
.cmdbar .btn--sm:hover { box-shadow: 5px 5px 0 var(--ink-800); }

.cmdbar.is-condensed .site-nav,
.cmdbar.is-condensed .cmdbar__status,
.cmdbar.is-condensed .cmdbar__cta { display: none; }
.cmdbar.is-condensed .cmdbar__season { display: inline-flex; }
.cmdbar.is-condensed .cmdbar__name { display: inline; }

@media (min-width: 1024px) {
  .cmdbar { padding: 0 14px; gap: 16px; }
}

@media (min-width: 1200px) {
  .cmdbar__name { display: inline; }
  .cmdbar__status { display: flex; }
  .cmdbar__cta { display: inline-flex; }
  .cmdbar__search { flex: 0 1 300px; min-width: 180px; }
}

@media (max-width: 1199px) {
  .cmdbar__season { display: none; }
}

/* ---------- 主导航 ---------- */
.site-nav {
  display: block;
  flex: 1 1 auto;
  min-width: 0;
}

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

.site-nav__item { list-style: none; }

.site-nav__link {
  display: block;
  padding: 8px 10px;
  color: var(--paper);
  border: 2px solid transparent;
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  transition: background var(--t) var(--ease), color var(--t) var(--ease), border-color var(--t) var(--ease);
}

.site-nav__link:hover {
  background: var(--ink-800);
  border-color: var(--ink-950);
  color: var(--accent);
}

.site-nav__link[aria-current="page"] {
  background: var(--accent);
  color: var(--ink-900);
  border-color: var(--ink-950);
  box-shadow: 3px 3px 0 var(--ink-800);
}

.nav-toggle {
  display: inline-flex;
  flex: 0 0 auto;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 42px;
  height: 36px;
  padding: 0 9px;
  background: var(--paper);
  border: 2px solid var(--ink-950);
  cursor: pointer;
}

.nav-toggle__bar {
  display: block;
  height: 2px;
  background: var(--ink-950);
  transition: transform var(--t) var(--ease), opacity var(--t) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

@media (min-width: 1024px) {
  .nav-toggle { display: none; }
}

@media (max-width: 1023px) {
  .site-nav {
    position: fixed;
    top: calc(var(--cmd-h) + var(--rail-h));
    left: 0;
    right: 0;
    max-height: calc(100vh - var(--cmd-h) - var(--rail-h));
    overflow-y: auto;
    padding: 12px 14px 18px;
    background-color: var(--ink-900);
    background-image: repeating-linear-gradient(45deg, rgba(199, 244, 100, 0.05) 0 1px, transparent 1px 9px);
    border-bottom: 2px solid var(--ink-950);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity var(--t) var(--ease), transform var(--t) var(--ease), visibility var(--t) var(--ease);
    z-index: 68;
  }
  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 6px; }
  .site-nav__link {
    padding: 13px 12px;
    font-size: 15px;
    border-color: var(--ink-800);
  }
  .site-nav__link[aria-current="page"] {
    border-color: var(--ink-950);
    box-shadow: 4px 4px 0 var(--ink-800);
  }
}

/* ---------- 阅读进度 ---------- */
.readline {
  position: absolute;
  left: 0;
  bottom: 0;
  height: 3px;
  width: 0;
  background: var(--accent);
  transition: width 120ms linear;
  pointer-events: none;
}

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 16px;
  background: var(--paper-3);
  color: var(--ink-950);
  border: 2px solid var(--ink-950);
  box-shadow: var(--shadow-hard-sm);
  font-size: 14px;
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  transition: transform var(--t) var(--ease), box-shadow var(--t) var(--ease), background var(--t) var(--ease), color var(--t) var(--ease);
}
.btn:hover { transform: translate(-2px, -2px); box-shadow: 6px 6px 0 var(--ink-950); }
.btn:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink-950); }

.btn--accent { background: var(--accent); color: var(--ink-900); }
.btn--sm { padding: 8px 12px; font-size: 12.5px; box-shadow: 3px 3px 0 var(--ink-950); }
.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--paper-2);
  box-shadow: 4px 4px 0 var(--ink-800);
}
.btn--ghost:hover { box-shadow: 6px 6px 0 var(--ink-800); color: var(--accent); border-color: var(--accent); }

/* ---------- 页脚 ---------- */
.site-footer {
  background-color: var(--ink-900);
  background-image: repeating-linear-gradient(45deg, rgba(199, 244, 100, 0.035) 0 1px, transparent 1px 9px);
  color: var(--paper);
  border-top: 2px solid var(--ink-950);
}

.foot-top { display: grid; grid-template-columns: 1fr; }

.foot-brand {
  padding: 28px 20px 26px;
  border-bottom: 2px solid var(--ink-800);
}

.foot-brand__mark {
  margin: 0 0 6px;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.foot-brand__sub {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.foot-intro {
  margin: 0 0 20px;
  max-width: 34em;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--paper-2);
}

.foot-body { display: grid; grid-template-columns: 1fr; }

.foot-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  padding: 22px 20px;
}

.foot-col { border-left: 2px solid var(--ink-800); padding-left: 14px; }

.foot-col__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: var(--accent);
}

.foot-col__list {
  display: flex;
  flex-direction: column;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.foot-col__list a {
  color: var(--paper-2);
  font-size: 14px;
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.foot-col__list a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.foot-contact { padding: 4px 20px 26px; }

.foot-contact__row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 12px;
  margin: 0;
  padding: 8px 0;
  border-bottom: 1px dashed var(--rule);
  font-size: 13px;
}

.foot-contact__k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.foot-contact__v { color: var(--paper-2); word-break: break-word; }

.foot-note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--muted);
}

.foot-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 14px 20px;
  background: var(--ink-950);
  border-top: 2px solid var(--ink-800);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
}

.foot-meta__icp { color: var(--paper-2); }

@media (min-width: 640px) {
  .foot-brand { padding: 34px 28px; }
  .foot-cols { padding: 26px 28px; }
  .foot-contact { padding: 4px 28px 30px; }
  .foot-meta { padding: 16px 28px; }
}

@media (min-width: 1024px) {
  .foot-top { grid-template-columns: minmax(280px, 1fr) minmax(0, 1.55fr); }
  .foot-brand { border-bottom: 0; border-right: 2px solid var(--ink-800); padding: 40px 30px; }
  .foot-body { grid-template-columns: minmax(0, 1.55fr) minmax(240px, 1fr); }
  .foot-cols { padding: 40px 28px; gap: 22px; }
  .foot-contact { padding: 40px 26px; border-left: 2px solid var(--ink-800); }
  .foot-meta { padding: 16px 30px; }
}

@media (max-width: 639px) {
  .foot-cols { grid-template-columns: 1fr; gap: 16px; }
  .foot-col { border-left: 0; border-top: 2px solid var(--ink-800); padding: 12px 0 0; }
}

/* ---------- 内容容器与网格 ---------- */
.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding: 0 20px; }
.wrap--wide { max-width: 1400px; }
.wrap--narrow { max-width: 760px; }

.prose { max-width: 40em; font-size: 16px; line-height: 1.75; }
.prose h2 { margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.25em; }

.stack { display: flex; flex-direction: column; gap: 14px; }

.grid-12 { display: grid; grid-template-columns: 1fr; gap: 22px; }

.col-main, .col-aside, .col-tick { min-width: 0; }

@media (min-width: 900px) {
  .grid-12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
  .col-main { grid-column: span 7; }
  .col-aside { grid-column: span 3; }
  .col-tick { grid-column: span 2; }
}

/* ---------- 章节 ---------- */
.section {
  padding: 40px 0;
  border-bottom: 2px solid var(--ink-950);
  position: relative;
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: 10px 18px;
  margin-bottom: 22px;
}

.section__title { margin: 0; font-size: 28px; font-weight: 900; }

.section__eyebrow,
.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--ink-800);
}

/* ---------- 面包屑 ---------- */
.crumb {
  padding: 14px 0;
  border-bottom: 2px solid var(--ink-950);
}

.crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.crumb__item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.crumb__item a {
  color: var(--ink-950);
  text-decoration: none;
  border-bottom: 2px solid var(--paper-2);
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease);
}
.crumb__item a:hover { color: var(--blue); border-bottom-color: var(--blue); }

.crumb__sep { color: var(--muted); }

/* ---------- 数据卡与口径行 ---------- */
.plate {
  padding: 16px 18px;
  background: var(--paper-3);
  border: 2px solid var(--ink-950);
  box-shadow: var(--shadow-hard);
}

.plate__head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 10px;
  margin-bottom: 12px;
  border-bottom: 2px solid var(--ink-950);
}

.plate__title { margin: 0; font-size: 16px; font-weight: 800; }
.plate__body { font-size: 14px; }

.spec {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  margin-top: 14px;
  padding-top: 8px;
  border-top: 1px dashed var(--muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--muted);
}

.spec__item { display: inline-flex; gap: 6px; }
.spec__key { color: var(--ink-800); }
.spec__val { color: var(--ink-950); }

.spec--dark { border-top-color: var(--rule); color: var(--muted); }
.spec--dark .spec__key { color: var(--accent); }
.spec--dark .spec__val { color: var(--paper); }

/* ---------- 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 7px;
  background: var(--paper-2);
  color: var(--ink-950);
  border: 1px solid var(--ink-950);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
}

.tag--accent { background: var(--accent); color: var(--ink-900); }
.tag--blue { background: var(--blue); color: var(--paper-3); }
.tag--red { background: var(--paper-3); color: var(--red); border-color: var(--red); }

/* ---------- 图片容器 ---------- */
.fig {
  position: relative;
  display: block;
  margin: 0;
  overflow: hidden;
  background: var(--paper-2);
  border: 2px solid var(--ink-950);
}

.fig img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(1.08);
}

.fig--wide { aspect-ratio: 16 / 9; }
.fig--tall { aspect-ratio: 3 / 4; }
.fig--square { aspect-ratio: 1 / 1; }

.fig__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  max-width: 100%;
  padding: 5px 9px;
  background: var(--ink-950);
  color: var(--paper-2);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
}

.frame {
  position: relative;
  padding: 16px;
  border: 2px solid var(--ink-950);
  background: var(--paper-3);
}
.frame::before,
.frame::after {
  content: "";
  position: absolute;
  width: 16px;
  height: 16px;
  border: 3px solid var(--accent);
}
.frame::before { top: -3px; left: -3px; border-right: 0; border-bottom: 0; }
.frame::after { bottom: -3px; right: -3px; border-left: 0; border-top: 0; }

/* ---------- 可展开内容组 ---------- */
.expand {
  background: var(--paper-3);
  border: 2px solid var(--ink-950);
  box-shadow: var(--shadow-hard-sm);
}
.expand + .expand { margin-top: 14px; }

.expand__trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  width: 100%;
  padding: 14px 16px;
  background: transparent;
  border: 0;
  color: var(--ink-950);
  font-family: inherit;
  font-size: 15px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
  transition: background var(--t) var(--ease);
}
.expand__trigger:hover { background: var(--paper-2); }

.expand__icon {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink-800);
  transition: color var(--t) var(--ease), transform var(--t) var(--ease);
}

.expand__panel {
  display: none;
  padding: 14px 16px 18px;
  border-top: 2px solid var(--ink-950);
  font-size: 14px;
}

.expand[data-open] .expand__panel { display: block; }
.expand[data-open] .expand__icon { color: var(--blue); transform: rotate(45deg); }

/* ---------- 材质 ---------- */
.turf {
  background-image: repeating-linear-gradient(45deg, rgba(199, 244, 100, 0.06) 0 1px, transparent 1px 9px);
}

.paper-grain { position: relative; }
.paper-grain::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(22, 24, 26, 0.07) 1px, transparent 1px);
  background-size: 5px 5px;
  opacity: 0.5;
}

/* ---------- 工具类 ---------- */
.u-mono { font-family: var(--font-mono); }
.u-muted { color: var(--muted); }

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
  .skip-link { transition: none; }
}