:root {
  --color-surface: #fcfcfc;
  --color-surface-alt: #f2f2f2;
  --color-surface-deep: #e5e4e4;
  --color-ink: #393233;
  --color-ink-soft: #685e60;
  --color-ink-muted: #857a7c;
  --color-line: #d9d8d8;
  --color-primary: #ea0b28;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f9dade;
  --color-accent: #e81733;
  --color-accent-ink: #ffffff;
  --color-highlight: #f8d3d8;
  --color-focus: #e60a27;
  --color-contrast-surface: #1b0b0d;
  --color-contrast-ink: #e7e4e5;
  --color-contrast-line: #483b3d;
  --color-contrast-accent: #ea2e47;
  --overlay-scrim: linear-gradient(180deg, rgba(27, 11, 13, 0.35) 0%, rgba(27, 11, 13, 0.72) 55%, rgba(27, 11, 13, 0.92) 100%);
  --font-heading: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-body: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(54px, 11.1vw, 142px);
  --text-figure: clamp(45px, 8.0vw, 102px);
  --weight-heading: 880;
  --weight-body: 400;
  --leading-body: 1.75;
  --leading-heading: 1.28;
  --tracking-heading: -0.012em;
  --radius-sm: 0px;
  --radius-md: 0px;
  --radius-lg: 0px;
  --radius-pill: 0px;
  --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: 1180px;
  --measure: 74ch;
  --gutter: 32px;
  --section-y: 102px;
  --section-y-lg: 143px;
}

/* ===== reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: 120px; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  margin: 0;
  background: 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;
}
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);
  text-align: left;
}
p, ul, ol, dl, figure, blockquote, table, pre { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
:focus-visible { outline: 2px solid var(--color-focus); outline-offset: 2px; }
#main-content { scroll-margin-top: 120px; }

/* ===== 布局基元 ===== */
.shell {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.site-main { display: block; padding-block-start: 112px; }
.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
}
.grid > [class*="col-"] { grid-column: span 12; }
@media (min-width: 900px) {
  .col-2 { grid-column: span 2; }
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-6 { grid-column: span 6; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
  .col-12 { grid-column: span 12; }
}
.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--flush { padding-block: 0; }
.rule { border: 0; border-top: var(--border-thin) solid var(--color-line); margin: 0; }
.rule--dot { border-top-style: dotted; }
.stack > * + * { margin-top: var(--space-3); }
.stack--tight > * + * { margin-top: var(--space-2); }
.stack--wide > * + * { margin-top: var(--space-6); }

/* ===== 排版工具 ===== */
.display {
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: -0.02em;
}
.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: -0.01em; }
.kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.kicker::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  background: var(--color-primary);
}
.lede { font-size: var(--text-lg); line-height: 1.5; color: var(--color-ink-soft); max-width: var(--measure); }
.prose { max-width: var(--measure); }
.prose p + p { margin-top: var(--space-3); }
.meta { font-size: var(--text-xs); letter-spacing: 0.06em; color: var(--color-ink-muted); }
.hl { background: var(--color-highlight); padding-inline: 4px; }
.link {
  color: var(--color-ink);
  border-bottom: 1px dotted var(--color-ink-muted);
  transition: color 150ms linear, border-color 150ms linear;
}
.link:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); border-bottom-style: solid; }

/* ===== 按钮与标签 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 40px;
  padding: 10px var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  color: var(--color-ink);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  line-height: 1;
  box-shadow: var(--shadow-1);
  transition: color 150ms linear, border-color 150ms linear, background-color 150ms linear;
}
.btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--primary {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--on-dark {
  background: 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); }
.btn--block { width: 100%; }
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 8px;
  border: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  border-radius: var(--radius-sm);
}
.tag--accent { border-color: var(--color-primary); color: var(--color-primary); }
.tag--on-dark { border-color: var(--color-contrast-line); color: var(--color-contrast-ink); }
.copy-btn {
  padding: 4px 8px;
  border: var(--border-thin) solid var(--color-contrast-line);
  color: var(--color-contrast-ink);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.4;
  border-radius: var(--radius-sm);
  transition: color 150ms linear, border-color 150ms linear, background-color 150ms linear;
}
.copy-btn:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }
.copy-btn[data-copied="true"] {
  background: var(--color-contrast-accent);
  border-color: var(--color-contrast-accent);
  color: var(--color-primary-ink);
}

/* ===== 面板与数据 ===== */
.panel {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.panel--alt { background: var(--color-surface-alt); }
.panel--contrast {
  background: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.panel__title {
  margin-bottom: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.panel--contrast .panel__title { color: var(--color-contrast-accent); }
.panel__note {
  margin-top: var(--space-2);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, var(--color-contrast-surface));
}
.stat-group {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}
.stat { min-width: 0; }
.stat__value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-ink);
}
.stat__label {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.panel--contrast .stat__value { color: var(--color-contrast-ink); }
.panel--contrast .stat__label { color: color-mix(in srgb, var(--color-contrast-ink) 68%, var(--color-contrast-surface)); }
.live { color: var(--color-contrast-accent); font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.ledger { border-top: var(--border-thin) solid var(--color-line); }
.ledger__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding-block: 10px;
  border-bottom: 1px dotted var(--color-line);
  font-size: var(--text-sm);
}
.panel--contrast .ledger { border-top-color: var(--color-contrast-line); }
.panel--contrast .ledger__item { border-bottom-color: var(--color-contrast-line); }
.link-list a {
  display: block;
  padding-block: 8px;
  border-bottom: 1px dotted var(--color-line);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  transition: color 150ms linear, border-color 150ms linear;
}
.link-list li:last-child a { border-bottom: 0; }
.link-list a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }
.panel--contrast .link-list a { color: var(--color-contrast-ink); border-bottom-color: var(--color-contrast-line); }
.panel--contrast .link-list a:hover { color: var(--color-contrast-accent); border-bottom-color: var(--color-contrast-accent); }
.meta-block { display: block; padding-block: 8px; font-size: var(--text-xs); }

/* ===== 面包屑 ===== */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.crumbs__item { display: inline-flex; align-items: center; }
.crumbs__item + .crumbs__item::before { content: "／"; margin-inline-end: var(--space-1); color: var(--color-line); }
.crumbs a { transition: color 150ms linear; }
.crumbs a:hover { color: var(--color-primary); }
.crumbs [aria-current="page"] { color: var(--color-ink); }

/* ===== 图片带 ===== */
.media-band {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  min-height: clamp(220px, 32vw, 380px);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-md);
}
.media-band__img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border: 0;
  border-radius: var(--radius-md);
}
.media-band::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--overlay-scrim);
}
.media-band__body {
  position: relative;
  width: 100%;
  padding: var(--space-6) var(--space-4);
  max-width: var(--measure);
}
.media-band__body h2,
.media-band__body h3 { color: var(--color-contrast-ink); }
.media-band__body p { color: color-mix(in srgb, var(--color-contrast-ink) 84%, var(--color-contrast-surface)); }

/* ===== 标签页 ===== */
[data-tabset] { display: block; }
.tabs {
  display: flex;
  flex-wrap: wrap;
  border-bottom: var(--border-thin) solid var(--color-line);
}
.tab {
  min-height: 40px;
  padding: 10px var(--space-3);
  border-bottom: 2px solid transparent;
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  transition: color 150ms linear, border-color 150ms linear;
}
.tab:hover { color: var(--color-ink); border-bottom-color: var(--color-line); }
.tab[aria-selected="true"] { color: var(--color-primary); border-bottom-color: var(--color-primary); }
[data-tab-panel][hidden] { display: none; }

/* ===== 折叠 ===== */
.accordion { border-top: var(--border-thin) solid var(--color-line); }
.accordion__item { border-bottom: var(--border-thin) solid var(--color-line); }
.accordion summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block: var(--space-3);
  cursor: pointer;
  list-style: none;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
}
.accordion summary::-webkit-details-marker { display: none; }
.accordion summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-primary);
}
.accordion__item[open] summary::after { content: "–"; }
.accordion__body { padding-block-end: var(--space-3); max-width: var(--measure); }

/* ===== 步骤 ===== */
.steps { counter-reset: step; border-top: var(--border-thin) solid var(--color-line); }
.steps__item {
  position: relative;
  counter-increment: step;
  padding: var(--space-3) 0 var(--space-3) var(--space-8);
  border-bottom: 1px dotted var(--color-line);
}
.steps__item::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  inset-inline-start: 0;
  top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-primary);
}

/* ===== 宽屏锚点索引 ===== */
.anchor-rail {
  position: fixed;
  inset-block-start: 50%;
  inset-inline-end: var(--space-4);
  transform: translateY(-50%);
  display: none;
  z-index: 40;
}
@media (min-width: 1440px) { .anchor-rail { display: block; } }
.anchor-rail a {
  display: block;
  padding: 6px 12px;
  border-inline-end: var(--border-thin) solid var(--color-line);
  text-align: right;
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  transition: color 150ms linear, border-color 150ms linear;
}
.anchor-rail a:hover { color: var(--color-ink); border-inline-end-color: var(--color-ink); }
.anchor-rail a[aria-current="true"] { color: var(--color-primary); border-inline-end-color: var(--color-primary); }

/* ===== 跳转链接 ===== */
.skip-link {
  position: fixed;
  inset-block-start: var(--space-1);
  inset-inline-start: var(--space-1);
  z-index: 100;
  padding: 10px var(--space-3);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transform: translateY(-220%);
  transition: transform 150ms linear;
}
.skip-link:focus { transform: translateY(0); }

/* ===== 头部 ===== */
.site-header {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  z-index: 60;
  padding-block: var(--space-2);
  pointer-events: none;
}
.site-header__inner { pointer-events: none; }
.scroll-progress {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: 2px;
  background: transparent;
  z-index: 70;
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 120ms linear;
}
.nav-island {
  position: relative;
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 64px;
  padding-inline: var(--space-3) var(--space-2);
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}
.brand {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding-block: var(--space-2);
  min-width: 0;
}
.brand__mark {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: 1.1;
  color: var(--color-ink);
}
.brand__tag {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin-inline-start: auto;
  padding: 8px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  transition: color 150ms linear, border-color 150ms linear;
}
.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.nav-toggle__bars { position: relative; display: block; width: 16px; height: 10px; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  inset-inline: 0;
  height: 2px;
  background: currentColor;
  transition: transform 160ms linear, top 160ms linear, bottom 160ms linear;
}
.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }
.nav-island[data-open] .nav-toggle__bars::before { top: 4px; transform: rotate(45deg); }
.nav-island[data-open] .nav-toggle__bars::after { bottom: 4px; transform: rotate(-45deg); }
.site-nav { display: none; }
.site-nav__list { display: flex; align-items: stretch; }
.site-nav__list a {
  position: relative;
  display: inline-flex;
  align-items: center;
  height: 100%;
  padding-inline: var(--space-3);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  transition: color 150ms linear;
}
.site-nav__list a::after {
  content: "";
  position: absolute;
  inset-inline: var(--space-3);
  inset-block-end: 0;
  height: 2px;
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 160ms linear;
}
.site-nav__list a:hover { color: var(--color-ink); }
.site-nav__list a:hover::after { transform: scaleX(1); }
.site-nav__list a[aria-current="page"] { color: var(--color-primary); }
.site-nav__list a[aria-current="page"]::after { transform: scaleX(1); }
.nav-cta { align-self: center; }
@media (min-width: 900px) {
  .nav-toggle { display: none; }
  .site-nav { display: flex; align-items: stretch; align-self: stretch; margin-inline-start: auto; }
}
@media (max-width: 899px) {
  .nav-island[data-open] .site-nav {
    display: block;
    position: absolute;
    inset-inline: -1px;
    inset-block-start: 100%;
    max-height: 70vh;
    overflow-y: auto;
    background: var(--color-surface);
    border: var(--border-thin) solid var(--color-line);
    border-block-start: 0;
  }
  .nav-island[data-open] .site-nav__list { display: block; }
  .nav-island[data-open] .site-nav__list a {
    display: flex;
    width: 100%;
    height: 52px;
    padding-inline: var(--space-3);
    border-bottom: 1px dotted var(--color-line);
  }
  .nav-island[data-open] .site-nav__list li:last-child a { border-bottom: 0; }
  .nav-island[data-open] .site-nav__list a::after { inset-inline: 0; }
}
@media (max-width: 767px) {
  .brand__tag { display: none; }
  .nav-island { min-height: 56px; padding-inline: var(--space-2); }
  .brand__mark { font-size: var(--text-base); }
  .nav-cta { padding-inline: var(--space-2); }
  .site-main { padding-block-start: 104px; }
}
@media (max-width: 479px) {
  .nav-toggle__text { display: none; }
  .nav-cta { font-size: var(--text-xs); }
}

/* ===== 页脚 ===== */
.site-footer {
  margin-block-start: var(--section-y);
  border-block-start: var(--border-thin) solid var(--color-line);
  background: var(--color-surface);
  padding-block: var(--space-8) var(--space-6);
}
.site-footer__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-block-end: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.site-footer__brand {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: 1.1;
  color: var(--color-ink);
}
.footer-panels {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gutter);
  margin-block-start: var(--space-6);
}
.footer-panel { grid-column: span 12; padding: var(--space-3); }
.footer-panel .panel__title { margin-bottom: var(--space-2); }
.contact-list { display: grid; gap: var(--space-2); }
.contact-row {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: baseline;
  gap: var(--space-2);
  padding-block-end: var(--space-2);
  border-bottom: 1px dotted var(--color-contrast-line);
}
.contact-row:last-child { padding-block-end: 0; border-bottom: 0; }
.contact-row__label {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: color-mix(in srgb, var(--color-contrast-accent) 88%, var(--color-contrast-ink));
}
.contact-row__value { font-size: var(--text-sm); color: var(--color-contrast-ink); word-break: break-word; }
.contact-row--stack { grid-template-columns: minmax(0, 1fr); }
.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  margin-block-start: var(--space-6);
  padding-block-start: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
}
@media (max-width: 719px) {
  .contact-row { grid-template-columns: minmax(0, 1fr); }
}
@media (min-width: 720px) {
  .footer-panel { grid-column: span 6; }
}
@media (min-width: 1000px) {
  .footer-panel--contact { grid-column: span 4; }
  .footer-panel--entry { grid-column: span 3; }
  .footer-panel--about { grid-column: span 2; }
  .footer-panel--legal { grid-column: span 3; }
}
@media (max-width: 899px) {
  .section { padding-block: var(--space-8); }
  .section--lg { padding-block: var(--space-8); }
  .stat-group { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
  .site-footer { padding-block: var(--space-6); }
}

/* ===== 动效降级 ===== */
@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;
  }
  .scroll-progress__bar { transition: none; }
}