/* ============================================================
   YUN体育 · /assets/site.css
   共享外壳与基础组件：框架式导航 + 章节化页脚 + 通用排版
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

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

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

[hidden] { display: none !important; }

:root {
  --ink: #061015;
  --night: #0A1826;
  --plateau: #0E4E5C;
  --paper: #F4EFE6;
  --brown: #1C1510;
  --orange: #FF6A2B;
  --lime: #B8FF3D;
  --sand: #C9A15A;
  --mist: #8FB8B6;
  --grey: #D7DEE0;
  --alert: #E5483F;
  --white: #FFFFFF;

  --shadow: 10px 10px 0 var(--ink);
  --shadow-sm: 5px 5px 0 var(--ink);
  --edge: 3px solid var(--ink);

  --rail-w: 276px;
  --strip-h: 60px;

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-serif: "Noto Serif SC", "Source Han Serif SC", Georgia, serif;
  --font-mono: "IBM Plex Mono", "Roboto Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --step: 140ms ease;
  --step-slow: 200ms ease;
}

/* ---------- 页面底色与框架留白 ---------- */

body {
  min-height: 100vh;
  padding-top: var(--strip-h);
  background:
    radial-gradient(1200px 620px at 82% -12%, rgba(14, 78, 92, 0.55), transparent 62%),
    radial-gradient(900px 520px at -10% 40%, rgba(14, 78, 92, 0.28), transparent 60%),
    var(--night);
  color: var(--grey);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.75;
  font-feature-settings: "kern" 1;
}

@media (min-width: 1024px) {
  body { padding-left: var(--rail-w); }
}

html.yun-nav-open,
html.yun-nav-open body { overflow: hidden; }

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

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

/* ---------- 跳转链接 ---------- */

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 300;
  padding: 0.6rem 1rem;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.06em;
  border: var(--edge);
  box-shadow: var(--shadow-sm);
  transform: translateY(-200%);
  transition: transform var(--step);
}

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

/* ---------- 外壳容器 ---------- */

.yun-header {
  position: relative;
  z-index: 120;
}

/* ---------- 滚动进度 ---------- */

.yun-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 140;
  background: rgba(6, 16, 21, 0.9);
  pointer-events: none;
}

.yun-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--orange), var(--sand) 55%, var(--lime));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 90ms linear;
}

@media (min-width: 1024px) {
  .yun-progress { left: var(--rail-w); }
}

/* ---------- 顶部记分牌色带 ---------- */

.yun-strip {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--strip-h);
  z-index: 100;
  background: linear-gradient(90deg, var(--ink) 0%, var(--night) 46%, var(--plateau) 165%);
  border-bottom: 3px solid var(--ink);
  box-shadow: 0 6px 0 rgba(6, 16, 21, 0.5);
}

@media (min-width: 1024px) {
  .yun-strip { left: var(--rail-w); }
}

.yun-strip__inner {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  height: 100%;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 1rem;
}

.yun-strip__brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
}

.yun-mark {
  display: inline-block;
  padding: 0.12rem 0.42rem;
  background: var(--orange);
  color: var(--ink);
  border: 2px solid var(--ink);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 1.05rem;
  letter-spacing: 0.1em;
  line-height: 1.35;
}

.yun-strip__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  letter-spacing: 0.02em;
  color: var(--white);
}

.yun-strip__line {
  padding-left: 0.7rem;
  border-left: 2px solid var(--plateau);
  color: var(--mist);
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.yun-strip__live {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-left: auto;
  padding: 0.22rem 0.6rem;
  border: 2px solid rgba(184, 255, 61, 0.42);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.yun-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(184, 255, 61, 0.16);
  animation: yun-pulse 2.4s ease-in-out infinite;
}

@keyframes yun-pulse {
  50% { opacity: 0.3; }
}

.yun-strip__cta { flex: none; }

/* ---------- 移动菜单按钮 ---------- */

.yun-nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-left: auto;
  padding: 0.4rem 0.7rem;
  border: 2px solid var(--plateau);
  background: rgba(14, 78, 92, 0.4);
  color: var(--white);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  cursor: pointer;
  transition: background var(--step), border-color var(--step), color var(--step);
}

.yun-nav-toggle:hover {
  background: var(--plateau);
  border-color: var(--lime);
  color: var(--lime);
}

.yun-nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: background var(--step);
}

.yun-nav-toggle__bars::before,
.yun-nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--step);
}

.yun-nav-toggle__bars::before { top: -6px; }
.yun-nav-toggle__bars::after { top: 6px; }

.yun-nav-toggle[aria-expanded="true"] .yun-nav-toggle__bars { background: transparent; }
.yun-nav-toggle[aria-expanded="true"] .yun-nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.yun-nav-toggle[aria-expanded="true"] .yun-nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 左侧框架导轨 = 主导航 ---------- */

.yun-rail {
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--rail-w);
  z-index: 110;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
  padding: calc(var(--strip-h) + 1.2rem) 1.1rem 1.1rem;
  overflow-y: auto;
  background: linear-gradient(180deg, var(--ink) 0%, var(--night) 52%, var(--plateau) 160%);
  border-right: 3px solid var(--ink);
}

.yun-rail__top { padding-bottom: 0.9rem; }

.yun-rail__brand {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
}

.yun-rail__mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 2.6rem;
  line-height: 0.95;
  letter-spacing: -0.02em;
  color: var(--white);
}

.yun-rail__wordmark {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: 0.16em;
  color: var(--sand);
}

.yun-rail__tagline {
  margin-top: 0.4rem;
  color: var(--mist);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
}

.yun-nav__list {
  display: flex;
  flex-direction: column;
  border-top: 2px solid rgba(143, 184, 182, 0.24);
}

.yun-nav__item { border-bottom: 2px solid rgba(143, 184, 182, 0.16); }

.yun-nav__link {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.68rem 0.5rem;
  border-left: 4px solid transparent;
  color: var(--grey);
  transition: background var(--step), color var(--step), padding var(--step), border-color var(--step);
}

.yun-nav__link:hover,
.yun-nav__link:focus-visible {
  background: var(--plateau);
  color: var(--white);
  border-left-color: var(--orange);
  padding-left: 0.9rem;
}

.yun-nav__link[aria-current="page"] {
  background: rgba(255, 106, 43, 0.16);
  color: var(--white);
  border-left-color: var(--orange);
}

.yun-nav__num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--mist);
  transition: color var(--step);
}

.yun-nav__link[aria-current="page"] .yun-nav__num,
.yun-nav__link:hover .yun-nav__num { color: var(--orange); }

.yun-nav__label {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.18rem;
  letter-spacing: 0.03em;
}

.yun-rail__foot {
  margin-top: auto;
  padding-top: 1rem;
  border-top: 2px dashed rgba(143, 184, 182, 0.3);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.yun-rail__cta { width: 100%; justify-content: center; }

.yun-rail__meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.07em;
}

/* ---------- 遮罩 ---------- */

.yun-scrim {
  position: fixed;
  inset: 0;
  z-index: 105;
  background: rgba(3, 8, 12, 0.68);
}

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

/* ---------- 断点：抽屉导航 ---------- */

@media (max-width: 1023px) {
  .yun-strip__line,
  .yun-strip__live,
  .yun-strip__cta { display: none; }

  .yun-rail {
    width: min(326px, 86vw);
    padding-top: 1.2rem;
    transform: translateX(-103%);
    transition: transform var(--step-slow);
    box-shadow: 14px 0 0 rgba(6, 16, 21, 0.55);
  }

  .yun-rail[data-open] { transform: translateX(0); }
}

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

/* ---------- 页脚 ---------- */

.yun-foot {
  position: relative;
  margin-top: 4.5rem;
  background: var(--ink);
  border-top: 6px solid var(--orange);
  color: var(--grey);
}

.yun-foot__band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem 1.5rem;
  padding: 0.7rem 1.25rem;
  background: var(--plateau);
  border-bottom: var(--edge);
}

.yun-foot__bandnum {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--lime);
}

.yun-foot__bandline {
  font-family: var(--font-serif);
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.yun-foot__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 1180px;
  margin: 0 auto;
  padding: 2.5rem 1.25rem;
}

@media (min-width: 640px) {
  .yun-foot__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1024px) {
  .yun-foot__inner { grid-template-columns: 1.4fr 1fr 1fr 1.25fr; gap: 2.25rem; }
}

.yun-foot__slogan {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.55rem;
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--white);
}

.yun-foot__note {
  margin: 0.85rem 0 1.2rem;
  max-width: 36ch;
  color: var(--mist);
  font-size: 0.9rem;
}

.yun-foot__coltitle {
  padding-bottom: 0.55rem;
  margin-bottom: 0.9rem;
  border-bottom: 2px solid rgba(201, 161, 90, 0.42);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.2em;
  color: var(--sand);
}

.yun-foot__links {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.yun-foot__links a {
  display: inline-block;
  color: var(--grey);
  font-size: 0.95rem;
  border-bottom: 2px solid transparent;
  transition: color var(--step), border-color var(--step), transform var(--step);
}

.yun-foot__links a:hover,
.yun-foot__links a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--orange);
  transform: translateX(3px);
}

.yun-foot__contact {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  font-size: 0.9rem;
}

.yun-foot__contact li {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}

.yun-foot__key {
  flex: none;
  min-width: 3.2em;
  padding-top: 0.1rem;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
}

.yun-foot__val { color: var(--grey); }

.yun-foot__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding: 1rem 1.25rem;
  background: linear-gradient(90deg, var(--ink), var(--night));
  border-top: 3px solid var(--plateau);
}

.yun-foot__legal p {
  font-size: 0.78rem;
  color: var(--mist);
}

.yun-foot__icp {
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
}

.yun-foot__year {
  font-family: var(--font-mono);
  color: var(--sand);
  letter-spacing: 0.06em;
}

/* ---------- 通用按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.58rem 1rem;
  border: var(--edge);
  box-shadow: 4px 4px 0 var(--ink);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: transform var(--step), box-shadow var(--step), background var(--step), color var(--step), border-color var(--step);
}

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

.btn--primary:hover,
.btn--primary:focus-visible {
  background: var(--lime);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

.btn--primary:active {
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.btn--ghost {
  background: transparent;
  color: var(--paper);
  border-color: var(--mist);
  box-shadow: 4px 4px 0 rgba(6, 16, 21, 0.6);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
  background: var(--plateau);
  color: var(--white);
  border-color: var(--white);
}

.btn--sand {
  background: var(--sand);
  color: var(--brown);
}

.btn--sand:hover,
.btn--sand:focus-visible {
  background: var(--paper);
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 var(--ink);
}

/* ---------- 容器与栅格 ---------- */

.shell {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: 1fr;
}

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 900px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

.split {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}

@media (min-width: 900px) {
  .split--5-7 { grid-template-columns: 5fr 7fr; }
  .split--7-5 { grid-template-columns: 7fr 5fr; }
  .split--6-6 { grid-template-columns: 1fr 1fr; }
}

.rule {
  height: 3px;
  border: 0;
  margin: 2rem 0;
  background: linear-gradient(90deg, var(--plateau), rgba(14, 78, 92, 0));
}

/* ---------- 面包屑 ---------- */

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
}

.crumbs a {
  color: var(--paper);
  border-bottom: 2px solid transparent;
  transition: color var(--step), border-color var(--step);
}

.crumbs a:hover,
.crumbs a:focus-visible {
  color: var(--white);
  border-bottom-color: var(--orange);
}

.crumbs__sep { color: var(--plateau); }

.crumbs__item[aria-current="page"] { color: var(--lime); }

/* ---------- 章节 ---------- */

.chapter {
  position: relative;
  padding: clamp(2.5rem, 6vw, 5rem) 0;
}

.chapter__band {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  padding: 0.55rem 1rem;
  background: var(--plateau);
  border-top: var(--edge);
  border-bottom: var(--edge);
  color: var(--paper);
}

.chapter__num {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  letter-spacing: 0.08em;
  color: var(--lime);
}

.chapter__kicker {
  font-family: var(--font-serif);
  font-size: 0.84rem;
  letter-spacing: 0.22em;
}

.chapter__title {
  margin-top: 1rem;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  line-height: 1.03;
  letter-spacing: -0.01em;
  color: var(--white);
}

.chapter--paper {
  background: var(--paper);
  color: var(--brown);
}

.chapter--paper .chapter__title { color: var(--brown); }

.chapter--paper .chapter__band {
  background: var(--brown);
  border-color: var(--brown);
  color: var(--paper);
}

.chapter--paper .chapter__num { color: var(--orange); }

/* ---------- 长文容器 ---------- */

.prose {
  max-width: 68ch;
  font-size: 1.05rem;
  line-height: 1.85;
  color: var(--grey);
}

.prose h2,
.prose h3 {
  margin-top: 1.8em;
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0;
  color: var(--white);
}

.prose h2 { font-size: 1.6rem; }
.prose h3 { font-size: 1.25rem; }

.prose p + p { margin-top: 1em; }

.prose ul,
.prose ol {
  margin-top: 1em;
  padding-left: 1.2rem;
  list-style: square;
}

.prose li + li { margin-top: 0.4em; }

.prose a {
  color: inherit;
  border-bottom: 2px solid var(--orange);
}

.prose--paper {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--paper);
  color: var(--brown);
  border: var(--edge);
  box-shadow: var(--shadow);
}

.prose--paper h2,
.prose--paper h3 { color: var(--brown); }

.prose--paper a { border-bottom-color: var(--orange); }

/* ---------- 面板 ---------- */

.panel {
  padding: 1.25rem;
  border: var(--edge);
  background: var(--night);
  box-shadow: var(--shadow);
}

.panel--plateau { background: var(--plateau); }
.panel--paper { background: var(--paper); color: var(--brown); }
.panel--sand {
  background: #241C12;
  border-color: var(--sand);
  box-shadow: var(--shadow-sm);
}

.panel__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.28rem;
  letter-spacing: 0.01em;
  color: var(--white);
}

.panel--paper .panel__title { color: var(--brown); }
.panel--sand .panel__title { color: var(--sand); }

/* ---------- 数据与标签 ---------- */

.data {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--white);
}

.data--xl {
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  line-height: 1;
  color: var(--orange);
}

.data--lg {
  font-size: 1.65rem;
  line-height: 1.1;
  color: var(--lime);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.52rem;
  border: 2px solid var(--mist);
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tag--live { border-color: var(--lime); color: var(--lime); }
.tag--hot { border-color: var(--orange); color: var(--orange); }
.tag--sand {
  border-color: var(--sand);
  color: var(--sand);
  background: rgba(201, 161, 90, 0.12);
}

/* ---------- 数据条 ---------- */

.meter {
  position: relative;
  height: 10px;
  border: 2px solid var(--ink);
  background: rgba(143, 184, 182, 0.22);
}

.meter__fill {
  display: block;
  height: 100%;
  background: var(--mist);
  transition: width 180ms ease;
}

.meter__fill--hot { background: var(--orange); }
.meter__fill--live { background: var(--lime); }

/* ---------- 图片容器（供页面阶段放置图片） ---------- */

.media {
  position: relative;
  overflow: hidden;
  border: var(--edge);
  box-shadow: var(--shadow-sm);
  background:
    repeating-linear-gradient(135deg, var(--night) 0 14px, var(--plateau) 14px 28px);
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.04);
}

.media__cap {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.42rem 0.6rem;
  background: rgba(6, 16, 21, 0.84);
  color: var(--grey);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
}

.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--4x5 { aspect-ratio: 4 / 5; }

.media--paper { border-color: var(--brown); box-shadow: var(--shadow-sm); }
.media--bare { box-shadow: none; }

/* ---------- 文本工具类 ---------- */

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--sand);
}

.lede {
  max-width: 62ch;
  font-size: 1.12rem;
  line-height: 1.8;
  color: var(--grey);
}

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

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ---------- 进入视口的轻量显现（由 JS 启用） ---------- */

.reveal-init [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 420ms ease, transform 420ms ease;
}

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

/* ---------- 减少动效 ---------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .yun-progress__bar { transition: none; }
  .reveal-init [data-reveal] { opacity: 1; transform: none; }
  .skip-link { transition: none; }
}