/* ============================================================
   亿百电竞中文站 · /assets/site.css
   01 重置 / 02 变量 / 03 基础排版 / 04 布局与工具
   05 组件 / 06 页头 / 07 页脚 / 08 响应式 / 09 动效降级
   ============================================================ */

/* ---------- 01 重置 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; }

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

body {
  min-height: 100vh;
  overflow-x: hidden;
  background-color: #0A0C10;
  color: #F2F5F7;
  font-family: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  font-size: 16px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

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

button, input, select, textarea { font: inherit; color: inherit; }

ul, ol { padding-left: 1.2em; }

a { color: inherit; }

h1, h2, h3, h4 { text-wrap: balance; }

:where([id]) { scroll-margin-top: clamp(6rem, 12vh, 8rem); }

:focus-visible {
  outline: 2px solid #2FF3D6;
  outline-offset: 3px;
}

::selection { background: #2FF3D6; color: #04140F; }

/* ---------- 02 变量 ---------- */
:root {
  --void: #0A0C10;
  --blueprint: #12161F;
  --paper: #EDE6D8;
  --cyan: #2FF3D6;
  --violet: #7B5CFF;
  --orange: #FF6A2B;
  --grid: #2A313D;
  --text: #F2F5F7;
  --muted: #98A2B3;
  --ink: #1A1B1E;

  --font-display: "Archivo Black", "Arial Black", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", system-ui, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-serif: "Source Han Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --gap: clamp(1rem, 2vw, 1.75rem);
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --max: 1240px;
  --cut: 18px;
  --clip-panel: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  --clip-btn: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
  --band-gap: clamp(3rem, 8vw, 6rem);
}

/* ---------- 03 基础排版 ---------- */
body {
  background-image:
    linear-gradient(to right, rgba(42, 49, 61, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 49, 61, 0.55) 1px, transparent 1px),
    radial-gradient(120% 80% at 88% -10%, rgba(123, 92, 255, 0.20), transparent 58%),
    radial-gradient(90% 70% at 0% 0%, rgba(47, 243, 214, 0.10), transparent 55%);
  background-size: 64px 64px, 64px 64px, 100% 100%, 100% 100%;
  background-repeat: repeat, repeat, no-repeat, no-repeat;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.03em;
}

h1 { font-size: clamp(2.125rem, 4.4vw + 0.9rem, 3.5rem); }
h2 { font-size: clamp(1.625rem, 2.6vw + 0.85rem, 2.5rem); }
h3 { font-size: clamp(1.25rem, 1.4vw + 0.85rem, 1.75rem); }
h4 { font-size: 1.0625rem; letter-spacing: -0.01em; }

p { text-wrap: pretty; }

strong { color: var(--text); }

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

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

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(2rem, 5vw, 3.5rem);
  background: linear-gradient(90deg, var(--cyan) 0%, var(--grid) 32%, var(--grid) 100%);
}

/* ---------- 04 布局与工具 ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.band-paper {
  --text: #1A1B1E;
  --muted: #5F5D55;
  --grid: #C9BFA9;
  background-color: var(--paper);
  color: var(--ink);
}

.band-blueprint {
  background-color: var(--blueprint);
  border-block: 1px solid var(--grid);
}

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

.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-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.flow > * + * { margin-top: var(--flow, 1.25rem); }

/* ---------- 05 组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.35rem;
  border: 1px solid var(--grid);
  background: var(--blueprint);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  text-decoration: none;
  cursor: pointer;
  clip-path: var(--clip-btn);
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.btn:hover { border-color: var(--cyan); color: var(--cyan); transform: translateY(-1px); }

.btn--primary {
  background: var(--cyan);
  border-color: var(--cyan);
  color: #04140F;
}

.btn--primary:hover {
  background: #63FFE6;
  border-color: #63FFE6;
  color: #04140F;
}

.btn--ghost {
  background: transparent;
  border-color: rgba(47, 243, 214, 0.55);
  color: var(--cyan);
}

.btn--ghost:hover { background: rgba(47, 243, 214, 0.10); }

.btn--sm { padding: 0.55rem 1rem; font-size: 0.8125rem; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.2rem 0.55rem;
  border: 1px solid rgba(47, 243, 214, 0.45);
  background: rgba(47, 243, 214, 0.08);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.tag--violet {
  border-color: rgba(123, 92, 255, 0.55);
  background: rgba(123, 92, 255, 0.14);
  color: #B8A7FF;
}

.tag--alert {
  border-color: rgba(255, 106, 43, 0.55);
  background: rgba(255, 106, 43, 0.12);
  color: #FF9A6B;
}

.dot {
  display: inline-block;
  width: 6px;
  height: 6px;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(47, 243, 214, 0.18);
}

.section-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(0.75rem, 2vw, 1.25rem);
  row-gap: 0.5rem;
  align-items: baseline;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.section-head__index {
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.section-head__title { grid-row: 1; }

.section-head__note {
  grid-column: 2;
  max-width: 56ch;
  color: var(--muted);
  font-family: var(--font-serif);
  font-size: 1rem;
  line-height: 1.7;
}

.panel {
  position: relative;
  padding: clamp(1.1rem, 2.2vw, 1.75rem);
  border: 1px solid var(--grid);
  background: var(--blueprint);
  clip-path: var(--clip-panel);
}

.panel--paper {
  background: var(--paper);
  border-color: #C9BFA9;
  color: var(--ink);
}

.panel--flush { padding: 0; }

.readout { display: grid; gap: 0.15rem; }

.readout__value {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 4.5rem);
  font-weight: 900;
  line-height: 0.94;
  letter-spacing: -0.04em;
  color: var(--cyan);
}

.readout__label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-block: 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.breadcrumb a:hover { color: var(--cyan); border-bottom-color: var(--cyan); }

.breadcrumb__sep { color: var(--grid); }

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

.prose {
  max-width: 68ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--text);
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 { font-size: clamp(1.4rem, 2vw + 0.7rem, 1.9rem); }
.prose h3 { margin-top: 1.8em; }

.prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.band-paper .prose a { color: #0B6E60; }

.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.4em; }

.prose blockquote {
  padding-left: 1rem;
  border-left: 2px solid var(--cyan);
  font-family: var(--font-serif);
  font-size: 1.1rem;
  color: var(--text);
}

.prose code {
  padding: 0.1em 0.4em;
  background: rgba(47, 243, 214, 0.10);
  font-family: var(--font-mono);
  font-size: 0.9em;
}

.toc {
  position: sticky;
  top: 6.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

.toc__title {
  margin-bottom: 0.6rem;
  color: var(--cyan);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.toc__list {
  display: grid;
  gap: 0.1rem;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--grid);
}

.toc__link {
  display: block;
  margin-left: -1px;
  padding: 0.4rem 0.75rem;
  border-left: 2px solid transparent;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.16s ease, border-color 0.16s ease, background-color 0.16s ease;
}

.toc__link:hover { color: var(--text); }

.toc__link[aria-current="true"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
  background: rgba(47, 243, 214, 0.07);
}

.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  border: 1px solid var(--grid);
  background: var(--blueprint);
  clip-path: var(--clip-panel);
}

.media-frame > img,
.media-frame > video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.06) contrast(1.04);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet) 55%, transparent);
  pointer-events: none;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--3x2 { aspect-ratio: 3 / 2; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--21x9 { aspect-ratio: 21 / 9; }
.media-frame--9x16 { aspect-ratio: 9 / 16; }

.media-frame--placeholder {
  display: grid;
  place-items: center;
  background-color: var(--blueprint);
  background-image:
    linear-gradient(to right, rgba(42, 49, 61, 0.9) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(42, 49, 61, 0.9) 1px, transparent 1px),
    radial-gradient(circle at 72% 22%, rgba(47, 243, 214, 0.16), transparent 58%),
    radial-gradient(circle at 18% 88%, rgba(123, 92, 255, 0.20), transparent 60%);
  background-size: 32px 32px, 32px 32px, 100% 100%, 100% 100%;
}

.media-frame__label {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  color: var(--muted);
  text-transform: uppercase;
}

/* ---------- 06 页头 ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--gutter);
  z-index: 120;
  padding: 0.65rem 1rem;
  background: var(--cyan);
  color: #04140F;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.skip-link:focus { top: 0.5rem; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(10, 12, 16, 0.94);
  border-bottom: 1px solid var(--grid);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.scanline {
  height: 2px;
  background: rgba(42, 49, 61, 0.7);
  overflow: hidden;
}

.scanline__bar {
  display: block;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan), var(--violet));
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.12s linear;
}

.status-bar {
  max-height: 4rem;
  overflow: hidden;
  border-bottom: 1px solid var(--grid);
  background: var(--blueprint);
  transition: max-height 0.28s ease, opacity 0.22s ease;
}

.status-bar__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 1.4rem;
  max-width: var(--max);
  margin-inline: auto;
  padding: 0.42rem var(--gutter);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.status-bar__item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  line-height: 1.4;
}

.status-bar__item .mono { color: var(--cyan); }

.status-bar__item--alert { color: var(--orange); }
.status-bar__item--alert .mono { color: var(--orange); }

.command-bar { position: relative; }

.command-bar__inner {
  display: flex;
  align-items: center;
  gap: clamp(0.75rem, 2vw, 1.75rem);
  max-width: var(--max);
  margin-inline: auto;
  padding: 0.7rem var(--gutter);
  min-height: 64px;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--text);
}

.brand__index {
  padding: 1px 6px;
  border: 1px solid rgba(47, 243, 214, 0.45);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brand__sub {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

.nav { margin-inline-start: auto; }

.nav__list {
  display: flex;
  align-items: center;
  gap: clamp(0.7rem, 1.6vw, 1.35rem);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: navi;
}

.nav__link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 0.3rem;
  padding: 0.35rem 0 0.45rem;
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.18s ease;
}

.nav__link::before {
  counter-increment: navi;
  content: counter(navi, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.56rem;
  letter-spacing: 0.1em;
  color: #4B5464;
  transition: color 0.18s ease;
}

.nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width 0.22s ease;
}

.nav__link:hover { color: var(--text); }
.nav__link:hover::after { width: 100%; }
.nav__link:hover::before { color: var(--cyan); }

.nav__link[aria-current="page"] { color: var(--cyan); }
.nav__link[aria-current="page"]::before { color: var(--cyan); }
.nav__link[aria-current="page"]::after { width: 100%; }

.command-bar__meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

.ver {
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--muted);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.5rem;
  padding: 0.45rem 0.7rem;
  border: 1px solid var(--grid);
  background: transparent;
  color: var(--cyan);
  cursor: pointer;
  clip-path: var(--clip-btn);
}

.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
}

.nav-toggle__lines {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: background-color 0.2s ease;
}

.nav-toggle__lines::before,
.nav-toggle__lines::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: var(--cyan);
  transition: transform 0.22s ease;
}

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

.site-header[data-open] .nav-toggle__lines { background: transparent; }
.site-header[data-open] .nav-toggle__lines::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__lines::after { transform: translateY(-6px) rotate(-45deg); }

.site-header[data-condensed] .status-bar {
  max-height: 0;
  opacity: 0;
  border-bottom-color: transparent;
}

/* ---------- 07 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--band-gap);
  padding-block: clamp(2.75rem, 6vw, 4.5rem) 1.5rem;
  background: var(--blueprint);
  border-top: 1px solid var(--grid);
  color: var(--text);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(320px, 42%);
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--violet), transparent);
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 2fr);
  gap: clamp(2rem, 5vw, 4rem);
  padding-bottom: clamp(2rem, 4vw, 3rem);
}

.footer-brand__mark {
  margin-bottom: 0.9rem;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.footer-brand__summary {
  max-width: 34ch;
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.25rem, 3vw, 2rem);
}

.footer-col__title {
  padding-bottom: 0.55rem;
  margin-bottom: 0.85rem;
  border-bottom: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  color: var(--cyan);
  text-transform: uppercase;
}

.footer-col__list {
  display: grid;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.footer-col__list a {
  display: inline-block;
  color: var(--muted);
  font-size: 0.9375rem;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer-col__list a:hover {
  color: var(--text);
  border-bottom-color: var(--cyan);
}

.footer-contact {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: clamp(0.9rem, 2vw, 1.5rem);
  padding-block: clamp(1.5rem, 3vw, 2rem);
  border-top: 1px solid var(--grid);
}

.footer-contact__item { display: grid; gap: 0.25rem; }

.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  color: var(--violet);
  text-transform: uppercase;
}

.footer-contact__value {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--grid);
  font-size: 0.78rem;
  color: var(--muted);
}

.footer-legal__icp { letter-spacing: 0.06em; }

.to-top {
  position: fixed;
  right: clamp(1rem, 4vw, 2rem);
  bottom: clamp(1rem, 4vw, 2rem);
  z-index: 70;
  padding: 0.6rem 0.9rem;
  border: 0;
  background: var(--cyan);
  color: #04140F;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  cursor: pointer;
  clip-path: var(--clip-btn);
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease, background-color 0.18s ease;
}

.to-top.is-visible {
  opacity: 1;
  transform: none;
  pointer-events: auto;
}

.to-top:hover { background: #63FFE6; }

/* ---------- 08 响应式 ---------- */
@media (max-width: 1180px) {
  .ver { display: none; }
}

@media (max-width: 1000px) {
  .nav-toggle { display: inline-flex; }

  .nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    margin-inline-start: 0;
    padding: 0.35rem var(--gutter) 1.1rem;
    background: var(--blueprint);
    border-bottom: 1px solid var(--grid);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.55);
    max-height: calc(100vh - 5rem);
    overflow-y: auto;
  }

  .site-header[data-open] .nav { display: block; }

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

  .nav__list > li { border-bottom: 1px solid rgba(42, 49, 61, 0.75); }

  .nav__link {
    width: 100%;
    padding: 0.9rem 0;
    font-size: 1rem;
    gap: 0.6rem;
  }

  .nav__link::before { font-size: 0.64rem; }

  .nav__link::after { height: 1px; }

  .command-bar__inner { justify-content: space-between; }

  .nav { margin-inline-start: 0; }

  body[data-nav-open] { overflow: hidden; }

  .footer-top { grid-template-columns: minmax(0, 1fr); }

  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6 { grid-column: span 3; }
  .col-7, .col-8, .col-9, .col-12 { grid-column: span 6; }

  .toc { position: static; }
}

@media (max-width: 720px) {
  .status-bar__item:nth-child(3) { display: none; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 640px) {
  .command-bar__meta .btn { display: none; }
  .brand__sub { display: none; }
  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .grid-12 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9, .col-12 { grid-column: span 2; }
  .section-head { grid-template-columns: minmax(0, 1fr); }
  .section-head__index { grid-row: auto; }
  .section-head__note { grid-column: 1; }
}

@media (min-width: 1400px) {
  :root { --max: 1320px; }
}

/* ---------- 09 动效降级 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .has-js [data-reveal] {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.5s ease-out, transform 0.5s ease-out;
  }

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

@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;
  }

  .has-js [data-reveal] { opacity: 1; transform: none; }
  .scanline__bar { transition: none; }
}