/* ==========================================================================
   6163银河中心 · /assets/site.css
   深夜天文台 × 品牌档案馆：深空星图基底 + 档案奶油纸层 + 印刷标签
   ========================================================================== */

/* 1 ── Reset ------------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 7.5rem; }
body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, table, th, td { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, picture, svg { display: block; max-width: 100%; }
table { width: 100%; border-collapse: collapse; }

/* 2 ── 设计变量 ---------------------------------------------------------- */
:root {
  /* 色彩角色 */
  --void: #0E0E24;
  --nebula: #1B1B3A;
  --galactic: #4B3F9E;
  --galactic-lit: #5F51C4;
  --cream: #F6EFE3;
  --ink: #2A2118;
  --gold: #F5C542;
  --gold-deep: #8A6A0C;
  --cyan: #3EE6C4;
  --cyan-ink: #0B473E;
  --vermilion: #C4472B;
  --vermilion-lit: #E8785C;
  --dust: #8B84C9;
  --mist: #D9D3F0;
  --mint: #BFEFE4;
  --starlight: #EDE9FB;

  --line-dark: rgba(139, 132, 201, .30);
  --line-darker: rgba(139, 132, 201, .16);
  --line-paper: rgba(42, 33, 24, .18);

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

  --shell: 1200px;
  --gutter: clamp(1.25rem, 4vw, 2.5rem);
  --block: clamp(3rem, 6vw, 4.5rem);
  --pad-card: clamp(1.5rem, 2.6vw, 2.25rem);
  --radius: 5px;
  --radius-lg: 10px;
  --rail-w: 3.25rem;
  --ease: cubic-bezier(.2, .7, .2, 1);
}

/* 3 ── 基础排版 ---------------------------------------------------------- */
body {
  min-height: 100vh;
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.75;
  color: var(--mint);
  background-color: var(--void);
  background-image:
    radial-gradient(62rem 40rem at 82% -10%, rgba(75, 63, 158, .55), transparent 62%),
    radial-gradient(40rem 32rem at 4% 12%, rgba(62, 230, 196, .09), transparent 66%),
    radial-gradient(54rem 40rem at 50% 116%, rgba(245, 197, 66, .07), transparent 62%);
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { color: var(--starlight); font-weight: 900; letter-spacing: .02em; line-height: 1.16; }
h1 { font-size: clamp(2.125rem, 5.4vw, 4.5rem); line-height: 1.06; }
h2 { font-size: clamp(1.75rem, 3.4vw, 2.75rem); }
h3 { font-size: clamp(1.25rem, 1.9vw, 1.75rem); line-height: 1.3; }
h4 { font-size: 1.0625rem; }
::selection { background: var(--gold); color: var(--ink); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 3px; }

.skip-link {
  position: absolute; left: 1rem; top: -120%; z-index: 500;
  padding: .7rem 1.1rem; border-radius: var(--radius);
  background: var(--gold); color: #241C08; font-weight: 700; letter-spacing: .04em;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: .75rem; }

/* 4 ── 布局容器与网格 ---------------------------------------------------- */
.shell { width: min(calc(100% - 2 * var(--gutter)), var(--shell)); margin-inline: auto; }

.section { padding-block: var(--block); }
.section--paper {
  position: relative;
  background: var(--cream); color: var(--ink);
  border-block: 1px solid var(--line-paper);
}
.section--paper h1, .section--paper h2, .section--paper h3, .section--paper h4 { color: var(--ink); }
.section--paper .lede, .section--paper p { color: #46392B; }
.section--dark {
  background: linear-gradient(180deg, rgba(27, 27, 58, .85), rgba(14, 14, 36, .55));
  border-block: 1px solid var(--line-darker);
}
.section-head { display: flex; flex-direction: column; gap: .3rem; margin-bottom: clamp(1.5rem, 3vw, 2.5rem); }

.grid { display: grid; gap: clamp(1rem, 2vw, 1.75rem); }
.grid--bento { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-3 { grid-column: span 3; }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* 5 ── 文字工具 ---------------------------------------------------------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: .5rem;
  font-family: var(--font-mono); font-size: .75rem; letter-spacing: .22em;
  text-transform: uppercase; color: var(--gold);
}
.section--paper .eyebrow { color: var(--gold-deep); }
.eyebrow::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 8px rgba(62, 230, 196, .9); }
.mono { font-family: var(--font-mono); letter-spacing: .03em; }
.lede { max-width: 42em; font-size: clamp(1.0625rem, 1.5vw, 1.25rem); line-height: 1.85; color: var(--mist); }
.muted { color: var(--dust); }
.star-rule {
  display: block; position: relative; width: 64px; height: 3px; margin-top: .8rem;
  border-radius: 3px; background: linear-gradient(90deg, var(--gold), var(--cyan));
}
.star-rule::after {
  content: ""; position: absolute; right: -11px; top: -2.5px; width: 8px; height: 8px;
  border-radius: 50%; background: var(--cyan); box-shadow: 0 0 10px rgba(62, 230, 196, .9);
}

.prose { max-width: 42em; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 1.9em; font-size: clamp(1.5rem, 2.4vw, 2rem); }
.prose h3 { margin-top: 1.6em; }
.prose ul, .prose ol { padding-left: 1.25em; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .45em; }
.prose blockquote { border-left: 3px solid var(--gold); padding-left: 1rem; color: var(--mist); }
.prose a { color: var(--cyan); border-bottom: 1px solid rgba(62, 230, 196, .55); }
.section--paper .prose a { color: var(--vermilion); border-bottom-color: rgba(196, 71, 43, .55); }

/* 6 ── 按钮与胶囊 -------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: .5rem;
  padding: .75rem 1.35rem; border: 1px solid transparent; border-radius: var(--radius);
  font-size: .9375rem; font-weight: 700; letter-spacing: .02em; line-height: 1.2;
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease), transform .22s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--solid { background: var(--galactic); color: var(--cream); border-color: rgba(217, 211, 240, .35); }
.btn--solid:hover { background: var(--galactic-lit); }
.btn--gold { background: var(--gold); color: #241C08; }
.btn--gold:hover { background: #FFD75E; }
.btn--ghost { background: transparent; color: var(--mist); border-color: var(--line-dark); }
.btn--ghost:hover { color: var(--cyan); border-color: var(--cyan); }
.btn--paper { background: var(--ink); color: var(--cream); }
.btn--paper:hover { background: var(--galactic); }

.chip {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .45rem .9rem; border: 1px solid var(--line-dark); border-radius: 999px;
  font-size: .8125rem; letter-spacing: .06em; color: var(--mist);
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}
.chip:hover { background: var(--cyan); border-color: var(--cyan); color: var(--cyan-ink); }
.chip--search::before { content: ""; width: 8px; height: 8px; border-radius: 50%; border: 1.5px solid currentColor; opacity: .85; }

/* 7 ── 页头：双层信息带 -------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 120;
  background: linear-gradient(180deg, rgba(14, 14, 36, .97), rgba(22, 22, 48, .94));
  border-bottom: 1px solid var(--line-dark);
  box-shadow: 0 18px 40px -34px rgba(0, 0, 0, .95);
  transition: border-color .25s var(--ease);
}
.site-header[data-open] { border-bottom-color: rgba(62, 230, 196, .55); }

.header-upper {
  background: linear-gradient(90deg, rgba(75, 63, 158, .35), rgba(14, 14, 36, .08) 70%);
  border-bottom: 1px solid var(--line-darker);
}
.header-upper__inner {
  display: flex; align-items: center; flex-wrap: wrap; gap: .4rem 1.25rem;
  min-height: 2.9rem; padding-block: .4rem; font-size: .8125rem; color: var(--dust);
}
.brand { display: inline-flex; align-items: center; gap: .6rem; color: var(--starlight); font-weight: 900; font-size: 1rem; letter-spacing: .06em; }
.brand__mark { position: relative; flex: none; width: 1.4rem; height: 1.4rem; border-radius: 50%; border: 1.5px solid var(--gold); }
.brand__mark::before { content: ""; position: absolute; inset: -.3rem; border-radius: 50%; border: 1px dashed rgba(139, 132, 201, .55); transition: border-color .25s var(--ease); }
.brand__mark::after { content: ""; position: absolute; inset: .3rem; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 10px rgba(62, 230, 196, .85); animation: breathe 5s ease-in-out infinite; }
.brand:hover .brand__mark::before { border-color: var(--cyan); }
.header-upper__tagline { color: var(--mist); letter-spacing: .1em; }
.header-upper__contact { display: inline-flex; align-items: center; gap: .55rem; margin-left: auto; }
.header-upper__label { padding: .05rem .55rem; border: 1px solid var(--line-dark); border-radius: 999px; font-size: .6875rem; letter-spacing: .14em; }
.header-upper__phone { color: var(--gold); font-size: .8125rem; }

.header-lower { background: linear-gradient(180deg, rgba(27, 27, 58, .55), rgba(14, 14, 36, .3)); }
.header-lower__inner { display: flex; align-items: center; gap: 1rem; min-height: 3.75rem; }
.header-lower__inner .chip { margin-left: auto; }

.site-nav__list { display: flex; align-items: center; flex-wrap: wrap; gap: clamp(.1rem, 1.2vw, .9rem); }
.site-nav a {
  position: relative; display: inline-block; padding: .6rem .45rem;
  font-size: .9375rem; letter-spacing: .04em; color: var(--mist);
  transition: color .22s var(--ease);
}
.site-nav a::after {
  content: ""; position: absolute; left: .45rem; right: .45rem; bottom: .3rem; height: 2px; border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
  transform: scaleX(0); transform-origin: left center; transition: transform .3s var(--ease);
}
.site-nav a:hover { color: var(--cream); }
.site-nav a:hover::after, .site-nav a:focus-visible::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: var(--gold); }
.site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a[aria-current="page"]::before {
  content: ""; position: absolute; left: .05rem; top: 50%; width: 5px; height: 5px; border-radius: 50%;
  background: var(--cyan); box-shadow: 0 0 8px rgba(62, 230, 196, .9); transform: translateY(-50%);
}

.nav-toggle { display: none; }

/* 8 ── 左侧对照轨道（宽屏常驻） ----------------------------------------- */
.compare-rail { display: none; }

/* 9 ── 页脚 -------------------------------------------------------------- */
.site-footer {
  position: relative;
  margin-top: clamp(3.5rem, 7vw, 6rem);
  color: var(--mist);
  border-top: 2px solid rgba(245, 197, 66, .55);
  background:
    radial-gradient(48rem 22rem at 14% 0%, rgba(75, 63, 158, .45), transparent 65%),
    linear-gradient(180deg, #141432, #0A0A1C);
}
.site-footer::before {
  content: ""; display: block; height: 1px;
  background: repeating-linear-gradient(90deg, var(--dust) 0 6px, transparent 6px 14px);
  opacity: .35;
}
.footer-grid {
  display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr;
  gap: clamp(1.5rem, 3vw, 3rem); padding-block: clamp(2.5rem, 5vw, 4rem);
}
.footer-brand__name { font-size: 1.25rem; font-weight: 900; letter-spacing: .08em; color: var(--starlight); }
.footer-brand__claim { margin-top: .5rem; color: var(--gold); letter-spacing: .08em; }
.footer-brand__note { margin-top: .85rem; max-width: 30em; font-size: .875rem; line-height: 1.75; color: var(--dust); }
.footer-col__title { margin-bottom: .9rem; font-size: .75rem; font-weight: 700; letter-spacing: .22em; color: var(--dust); font-family: var(--font-mono); }
.footer-col__list { display: flex; flex-direction: column; gap: .55rem; font-size: .9375rem; }
.footer-col__list a { color: var(--mist); border-bottom: 1px solid transparent; transition: color .2s var(--ease), border-color .2s var(--ease); }
.footer-col__list a:hover { color: var(--gold); border-bottom-color: rgba(245, 197, 66, .5); }
.footer-col--contact .footer-col__list li { display: flex; flex-direction: column; gap: .1rem; }
.footer-col--contact .footer-col__list span:last-child { overflow-wrap: anywhere; }
.footer-col--contact .mono { color: var(--cream); }
.footer-col__key { font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .16em; color: var(--dust); }
.footer-base { border-top: 1px solid rgba(139, 132, 201, .22); font-size: .8125rem; color: var(--dust); }
.footer-base__inner { display: flex; flex-wrap: wrap; justify-content: space-between; gap: .5rem 1.5rem; padding-block: 1.1rem; }

/* 10 ── 面包屑 ----------------------------------------------------------- */
.breadcrumb { padding-block: 1.1rem; }
.breadcrumb__list { display: flex; flex-wrap: wrap; gap: .35rem .6rem; font-family: var(--font-mono); font-size: .8125rem; color: var(--dust); }
.breadcrumb__list li + li::before { content: "/"; margin-right: .6rem; color: rgba(139, 132, 201, .6); }
.breadcrumb__list a:hover { color: var(--cyan); }
.breadcrumb__list [aria-current="page"] { color: var(--mist); }

/* 11 ── 档案卡片与标签 --------------------------------------------------- */
.card {
  position: relative;
  background: linear-gradient(180deg, rgba(27, 27, 58, .72), rgba(14, 14, 36, .55));
  border: 1px solid var(--line-dark); border-radius: var(--radius-lg);
  padding: var(--pad-card);
}
.card--glow { box-shadow: 0 0 0 1px rgba(245, 197, 66, .28), 0 30px 60px -50px rgba(62, 230, 196, .8); }

.paper {
  position: relative; isolation: isolate;
  background: var(--cream); color: var(--ink);
  border: 1px solid var(--line-paper); border-radius: var(--radius);
  padding: var(--pad-card);
  box-shadow: 0 24px 48px -38px rgba(0, 0, 0, .9);
}
.paper h1, .paper h2, .paper h3, .paper h4 { color: var(--ink); }
.paper--stack::before, .paper--stack::after {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: var(--cream); border: 1px solid var(--line-paper); border-radius: var(--radius);
}
.paper--stack::before { transform: translate(9px, 9px) rotate(.5deg); opacity: .6; }
.paper--stack::after { transform: translate(18px, 18px) rotate(-.4deg); opacity: .32; }

.tag {
  display: inline-flex; align-items: center; gap: .35rem;
  padding: .22rem .55rem; border: 1px solid currentColor; border-radius: 3px;
  font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .14em; line-height: 1.5;
}
.tag--gold { color: var(--gold); }
.tag--cyan { color: var(--cyan); }
.tag--vermilion { color: var(--vermilion-lit); }
.paper .tag--gold { color: var(--gold-deep); }
.paper .tag--cyan { color: #0F6E5E; }
.paper .tag--vermilion { color: var(--vermilion); }

/* 12 ── 响应式图像容器（页面阶段放图） ----------------------------------- */
.media-frame {
  position: relative; overflow: hidden;
  border: 1px solid var(--line-dark); border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 120% at 20% 8%, rgba(75, 63, 158, .75), transparent 62%),
    linear-gradient(160deg, #171735, #0E0E24 72%);
}
.media-frame::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .55;
  background-image:
    linear-gradient(rgba(139, 132, 201, .16) 1px, transparent 1px),
    linear-gradient(90deg, rgba(139, 132, 201, .16) 1px, transparent 1px);
  background-size: 2.5rem 2.5rem;
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--paper {
  border-color: var(--line-paper);
  background: linear-gradient(160deg, #EFE7D8, #DCD2BE);
}
.media-frame--paper::after {
  opacity: .5;
  background-image:
    linear-gradient(rgba(42, 33, 24, .14) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 33, 24, .14) 1px, transparent 1px);
}
.media-frame__cap {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: .6rem .9rem; font-family: var(--font-mono); font-size: .6875rem; letter-spacing: .12em;
  color: var(--mist); background: linear-gradient(180deg, transparent, rgba(14, 14, 36, .92));
}

/* 13 ── 标签页（同级内容切换） ------------------------------------------- */
.tabs { display: block; }
.tabs__list { display: flex; flex-wrap: wrap; gap: .5rem; padding-bottom: .85rem; border-bottom: 1px solid var(--line-dark); }
.tabs__tab {
  padding: .55rem 1.05rem; border: 1px solid var(--line-dark); border-radius: 999px;
  font-size: .875rem; letter-spacing: .04em; color: var(--mist);
  transition: background .22s var(--ease), color .22s var(--ease), border-color .22s var(--ease);
}
.tabs__tab:hover { color: var(--cyan); border-color: var(--cyan); }
.tabs__tab[aria-selected="true"] { background: var(--gold); border-color: var(--gold); color: #241C08; font-weight: 700; }
.tabs__panel { padding-top: 1.5rem; }
.tabs__panel[hidden] { display: none; }

/* 14 ── 显现与滚动进度 --------------------------------------------------- */
[data-reveal] { opacity: 0; transform: translateY(20px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
[data-reveal].is-visible { opacity: 1; transform: none; }
.scroll-progress {
  position: fixed; top: 0; left: 0; width: 100%; height: 3px; z-index: 400;
  transform: scaleX(0); transform-origin: 0 50%; pointer-events: none;
  background: linear-gradient(90deg, var(--gold), var(--cyan));
}

/* 15 ── 关键帧 ------------------------------------------------------------ */
@keyframes breathe {
  0%, 100% { opacity: .55; transform: scale(.92); }
  50% { opacity: 1; transform: scale(1); }
}
@keyframes node-in {
  from { opacity: 0; transform: translateX(-.7rem); }
  to { opacity: 1; transform: none; }
}

/* 16 ── 响应式：平板 ------------------------------------------------------ */
@media (max-width: 1080px) {
  .span-3, .span-4, .span-5 { grid-column: span 6; }
  .span-7, .span-8 { grid-column: span 12; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* 17 ── 响应式：移动 / 星座抽屉导航 --------------------------------------- */
@media (max-width: 960px) {
  html { scroll-padding-top: 6.25rem; }

  .site-nav {
    position: absolute; left: 0; right: 0; top: 100%; z-index: 118;
    max-height: calc(100vh - 6.25rem); overflow-y: auto;
    padding: 1.5rem var(--gutter) 2rem;
    background: linear-gradient(180deg, #16163A, #0B0B1E 88%);
    border-bottom: 1px solid var(--line-dark);
    opacity: 0; visibility: hidden; transform: translateY(-1.25rem);
    transition: opacity .28s var(--ease), transform .32s var(--ease), visibility .32s;
  }
  .site-nav[data-open] { opacity: 1; visibility: visible; transform: none; }

  .site-nav__list {
    flex-direction: column; align-items: stretch; gap: .1rem;
    padding-left: 1.15rem; border-left: 1px dashed rgba(139, 132, 201, .4);
  }
  .site-nav__list li { opacity: 0; }
  .site-nav[data-open] .site-nav__list li { animation: node-in .45s var(--ease) forwards; }
  .site-nav[data-open] .site-nav__list li:nth-child(1) { animation-delay: .04s; }
  .site-nav[data-open] .site-nav__list li:nth-child(2) { animation-delay: .10s; }
  .site-nav[data-open] .site-nav__list li:nth-child(3) { animation-delay: .16s; }
  .site-nav[data-open] .site-nav__list li:nth-child(4) { animation-delay: .22s; }
  .site-nav[data-open] .site-nav__list li:nth-child(5) { animation-delay: .28s; }
  .site-nav[data-open] .site-nav__list li:nth-child(6) { animation-delay: .34s; }

  .site-nav a {
    display: block; padding: .85rem .3rem; font-size: 1.125rem;
    border-bottom: 1px solid var(--line-darker);
  }
  .site-nav a::after { display: none; }
  .site-nav a::before {
    content: ""; position: absolute; left: -1.45rem; top: 50%; width: 9px; height: 9px;
    border-radius: 50%; background: rgba(139, 132, 201, .55); transform: translateY(-50%);
  }
  .site-nav a[aria-current="page"] { color: var(--gold); }
  .site-nav a[aria-current="page"]::before {
    left: -1.45rem; top: 50%; width: 9px; height: 9px;
    background: var(--cyan); box-shadow: 0 0 10px rgba(62, 230, 196, .9);
  }

  .nav-toggle {
    display: inline-flex; align-items: center; gap: .55rem;
    padding: .5rem .7rem; border: 1px solid var(--line-dark); border-radius: var(--radius);
    color: var(--cream); font-size: .8125rem; letter-spacing: .14em;
  }
  .nav-toggle__bars { display: grid; gap: 3px; width: 1.05rem; }
  .nav-toggle__bars span { display: block; height: 2px; border-radius: 2px; background: currentColor; transition: transform .25s var(--ease), opacity .2s var(--ease); }
  [data-nav-toggle][aria-expanded="true"] .nav-toggle__bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
  [data-nav-toggle][aria-expanded="true"] .nav-toggle__bars span:nth-child(2) { opacity: 0; }
  [data-nav-toggle][aria-expanded="true"] .nav-toggle__bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
}

/* 18 ── 响应式：手机 ------------------------------------------------------ */
@media (max-width: 760px) {
  .header-upper__inner { gap: .3rem .75rem; font-size: .75rem; }
  .header-upper__tagline { display: none; }
  .header-upper__phone { font-size: .75rem; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 520px) {
  html { scroll-padding-top: 5.5rem; }
  .header-upper__label { display: none; }
  .brand__name { font-size: .9375rem; }
  .header-lower__inner { min-height: 3.375rem; }
  .chip { padding: .4rem .7rem; font-size: .75rem; }
  .span-3, .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 12; }
}

/* 19 ── 宽屏：左侧对照轨道常驻 -------------------------------------------- */
@media (min-width: 1200px) {
  body { padding-left: var(--rail-w); }
  .compare-rail {
    display: block; position: fixed; left: 0; top: 0; bottom: 0; width: var(--rail-w); z-index: 110;
    padding-block: 8.5rem 2rem;
    background: linear-gradient(180deg, rgba(27, 27, 58, .9), rgba(14, 14, 36, .92));
    border-right: 1px solid var(--line-dark);
  }
  .compare-rail__list { display: flex; flex-direction: column; align-items: center; gap: 1.4rem; }
  .compare-rail__link {
    display: block; padding: .6rem .35rem; border: 1px solid transparent; border-radius: 3px;
    writing-mode: vertical-rl; text-orientation: mixed;
    font-size: .75rem; letter-spacing: .24em; color: var(--dust);
    transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
  }
  .compare-rail__link:hover, .compare-rail__link:focus-visible {
    color: var(--gold); border-color: rgba(245, 197, 66, .5);
    background: rgba(75, 63, 158, .28);
  }
}

/* 20 ── 减少动态偏好 ------------------------------------------------------ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .site-nav__list li { opacity: 1 !important; }
  .scroll-progress { display: none; }
}