:root {
  --color-surface: #f7f7f8;
  --color-surface-alt: #ededee;
  --color-surface-deep: #dfdfe0;
  --color-ink: #2d3034;
  --color-ink-soft: #585e65;
  --color-ink-muted: #737a82;
  --color-line: #d3d3d5;
  --color-primary: #1775de;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #d8e5f4;
  --color-accent: #df0688;
  --color-accent-ink: #ffffff;
  --color-highlight: #f3cce4;
  --color-focus: #d60080;
  --color-contrast-surface: #0e161e;
  --color-contrast-ink: #e4e5e7;
  --color-contrast-line: #3d444a;
  --color-contrast-accent: #f80797;
  --overlay-scrim: linear-gradient(180deg, rgba(14, 22, 30, 0.35) 0%, rgba(14, 22, 30, 0.72) 55%, rgba(14, 22, 30, 0.92) 100%);
  --font-heading: "Source Han Sans SC", "Noto Sans SC", SimHei, "Microsoft YaHei", sans-serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 10.1px;
  --text-sm: 14.3px;
  --text-base: 17px;
  --text-lg: 24.0px;
  --text-xl: 34.0px;
  --text-2xl: 48.1px;
  --text-3xl: 68.0px;
  --text-4xl: 96.1px;
  --text-display: clamp(48px, 9.8vw, 126px);
  --text-figure: clamp(40px, 7.1vw, 91px);
  --weight-heading: 808;
  --weight-body: 400;
  --leading-body: 1.76;
  --leading-heading: 1.25;
  --tracking-heading: -0.014em;
  --radius-sm: 251px;
  --radius-md: 561px;
  --radius-lg: 871px;
  --radius-pill: 999px;
  --border-thin: 2px;
  --border-thick: 2px;
  --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: 1160px;
  --measure: 66ch;
  --gutter: 32px;
  --section-y: 98px;
  --section-y-lg: 137px;
}

/* ===== 02 Reset 与中文排版 ===== */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: 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;
  text-rendering: optimizeLegibility;
}

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);
  color: var(--color-ink);
}

p { margin: 0 0 var(--space-2); }

a {
  color: var(--color-primary);
  text-underline-offset: 3px;
}

ul, ol { margin: 0 0 var(--space-2); padding-left: 1.25em; }
li { margin-bottom: 0.25em; }

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

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

button { background: none; border: 0; }

hr {
  border: 0;
  border-top: var(--border-thin) solid var(--color-line);
  margin: var(--space-4) 0;
}

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

.num,
[data-num],
time,
.data-table .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

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

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -140px;
  z-index: 200;
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
  transition: top 0.16s ease;
}

.skip-link:focus { top: var(--space-2); }

/* ===== 03 布局骨架 ===== */
.container {
  width: 100%;
  max-width: calc(var(--container) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--flush-top { padding-top: 0; }
.section--alt { background-color: var(--color-surface-alt); }
.section--deep { background-color: var(--color-surface-deep); }

.section--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--contrast h1,
.section--contrast h2,
.section--contrast h3,
.section--contrast h4,
.section--contrast .display { color: var(--color-contrast-ink); }
.section--contrast p { color: var(--color-contrast-ink); }

.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--8 {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: var(--gutter);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (min-width: 901px) {
  .span-2 { grid-column: span 2; }
  .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; }
}

/* ===== 04 文字与强调 ===== */
.display {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.02;
  letter-spacing: -0.026em;
  margin: 0;
}

.h1 { font-size: clamp(var(--text-2xl), 7vw, var(--text-4xl)); margin: 0; }
.h2 { font-size: clamp(var(--text-xl), 5vw, var(--text-3xl)); margin: 0; }
.h3 { font-size: clamp(var(--text-lg), 3.4vw, var(--text-2xl)); margin: 0; }
.h4 { font-size: var(--text-xl); margin: 0; }
.h5 { font-size: var(--text-lg); margin: 0; }

.figure {
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: var(--weight-heading);
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 0;
}

.lead {
  font-size: var(--text-lg);
  line-height: 1.5;
  color: var(--color-ink-soft);
  max-width: var(--measure);
  margin-bottom: var(--space-3);
}

.prose { max-width: var(--measure); }
.prose p { color: var(--color-ink-soft); }
.prose strong { color: var(--color-ink); font-weight: 700; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.eyebrow::before {
  content: "";
  width: 30px;
  height: 4px;
  background-color: var(--color-accent);
}

.accent-bar {
  border-left: 6px solid var(--color-primary);
  padding-left: var(--space-3);
}

.accent-bar--accent { border-left-color: var(--color-accent); }

.text-accent { color: var(--color-accent); }
.text-muted { color: var(--color-ink-muted); font-size: var(--text-sm); }

/* ===== 05 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 26px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.btn--sm { padding: 9px 18px; font-size: var(--text-xs); letter-spacing: 0.02em; }

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.btn--primary:hover { background-color: color-mix(in srgb, var(--color-primary) 78%, #000000); }

.btn--accent {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}
.btn--accent:hover { background-color: color-mix(in srgb, var(--color-accent) 78%, #000000); }

.btn--outline {
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn--outline:hover {
  border-color: var(--color-contrast-surface);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.btn--on-dark {
  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);
}

/* ===== 06 分段控件 ===== */
.seg {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 3px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
}

.seg-option {
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.seg-option:hover {
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
}

.seg-option[aria-pressed="true"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.seg--accent .seg-option[aria-pressed="true"] {
  background-color: var(--color-accent);
  color: var(--color-accent-ink);
}

/* ===== 07 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  padding-block: var(--space-2);
  background-image: linear-gradient(
    180deg,
    var(--color-surface) 0%,
    var(--color-surface) 74%,
    color-mix(in srgb, var(--color-surface) 0%, transparent) 100%
  );
  transition: padding-block 0.2s ease;
}

.site-header > .container { position: relative; }

.site-header[data-scrolled="true"] { padding-block: var(--space-1); }

.header-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 6px 7px 6px 18px;
  border: var(--border-thick) solid var(--color-ink);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: none;
  color: var(--color-ink);
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 34px;
  height: 34px;
  flex: none;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-primary) 50%, var(--color-accent) 50%);
  overflow: hidden;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 30%;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
}

.brand-text { display: flex; flex-direction: column; }

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

.brand-note {
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  line-height: 1.3;
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  cursor: pointer;
}

.nav-toggle-icon {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  background-color: currentColor;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background-color: currentColor;
}

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

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

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

.nav-list li { margin: 0; }

.nav-link {
  display: inline-block;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  color: var(--color-ink-soft);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  text-decoration: none;
  transition: background-color 0.16s ease, color 0.16s ease;
}

.nav-link:hover {
  background-color: var(--color-surface-alt);
  color: var(--color-ink);
}

.nav-link[aria-current="page"] {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.header-meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: none;
}

.header-sync {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.sync-dot {
  width: 8px;
  height: 8px;
  flex: none;
  border-radius: var(--radius-pill);
  background-color: var(--color-accent);
}

.sync-time { color: var(--color-ink); font-weight: 700; }

.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding-top: var(--space-2);
  flex-wrap: wrap;
  transition: padding-top 0.2s ease;
}

.site-header[data-scrolled="true"] .header-tools { padding-top: 6px; }

.site-header[data-scrolled="true"] .seg-option {
  padding: 4px 11px;
  font-size: var(--text-xs);
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform 0.08s linear;
}

/* ===== 08 页脚 ===== */
.site-footer {
  position: relative;
  overflow: hidden;
  padding-block: var(--space-8) var(--space-4);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.footer-cut {
  position: absolute;
  inset: 0 0 auto 0;
  height: 120px;
  pointer-events: none;
}

.footer-cut::before {
  content: "";
  position: absolute;
  top: -150px;
  left: 6%;
  width: 240px;
  height: 240px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary);
}

.footer-cut::after {
  content: "";
  position: absolute;
  top: 74px;
  right: -5%;
  width: 46%;
  height: 10px;
  background-color: var(--color-accent);
  transform: rotate(-2.4deg);
}

.footer-inner { position: relative; z-index: 1; padding-top: var(--space-3); }

.footer-top {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 2fr);
  gap: var(--space-6);
}

.footer-brand-name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-contrast-ink);
  letter-spacing: -0.01em;
}

.footer-brand-note {
  margin: var(--space-1) 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-contrast-accent);
}

.footer-brand-line {
  margin: var(--space-2) 0 0;
  max-width: 34ch;
  font-size: var(--text-sm);
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-contrast-ink) 78%, transparent);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.footer-col-title {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 800;
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

.footer-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.footer-links li { margin: 0; }

.footer-links a {
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-contrast-accent);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.footer-contact {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-6);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-contrast-line);
}

.footer-contact-item {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
}

.footer-contact-key {
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-contrast-accent);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-contrast-line);
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.footer-top-btn {
  padding: 8px 18px;
  border: var(--border-thin) solid var(--color-contrast-line);
  border-radius: var(--radius-pill);
  background-color: transparent;
  color: var(--color-contrast-ink);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 700;
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.footer-top-btn:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* ===== 09 内容组件 ===== */
.panel {
  padding: var(--space-4);
  background-color: var(--color-surface-alt);
}

.panel--deep { background-color: var(--color-surface-deep); }

.panel--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.panel--primary h2,
.panel--primary h3,
.panel--primary .h3 { color: var(--color-primary-ink); }

.panel--contrast {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.panel--contrast h2,
.panel--contrast h3,
.panel--contrast .h3 { color: var(--color-contrast-ink); }

.panel-title {
  margin-bottom: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
}

.status-panel {
  padding: var(--space-3);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.status-panel-title {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-accent);
}

.status-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-2);
  padding: 10px 0;
  border-bottom: 1px solid var(--color-contrast-line);
  font-size: var(--text-sm);
}

.status-row:last-child { border-bottom: 0; }

.status-key { color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent); }

.status-value {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-contrast-ink);
}

.status-value--live { color: var(--color-contrast-accent); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
}

.chip--accent {
  background-color: var(--color-highlight);
  color: var(--color-ink);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.data-table th,
.data-table td {
  padding: 10px 12px;
  text-align: left;
  border-bottom: 1px solid var(--color-line);
}

.data-table th {
  background-color: var(--color-surface-deep);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
}

.data-table tr[data-current="true"] { background-color: var(--color-highlight); }
.data-table tr[data-current="true"] td { font-weight: 700; }

.breadcrumbs {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.breadcrumbs li { margin: 0; }
.breadcrumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: var(--color-line);
}

.breadcrumbs a {
  color: var(--color-ink-soft);
  text-decoration: none;
}

.breadcrumbs a:hover { color: var(--color-primary); text-decoration: underline; }

/* ===== 10 图片容器基础规则 ===== */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  background-color: var(--color-surface-deep);
}

.media-frame > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background-color: var(--color-primary);
  mix-blend-mode: multiply;
  opacity: 0.5;
  pointer-events: none;
}

.media-frame--accent::after { background-color: var(--color-accent); }
.media-frame--plain::after { display: none; }

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }
.media-frame--3x4 { aspect-ratio: 3 / 4; }
.media-frame--circle { aspect-ratio: 1 / 1; border-radius: var(--radius-pill); }

.media-frame-caption {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding: var(--space-3);
  background-image: var(--overlay-scrim);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.6;
}

/* ===== 11 显现动效协议 ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.32s ease, transform 0.32s ease;
}

[data-reveal][data-revealed="true"] {
  opacity: 1;
  transform: none;
}

/* ===== 12 响应式 ===== */
@media (max-width: 1080px) {
  .header-tools { gap: 10px; }
  .header-sync { display: none; }
}

@media (max-width: 920px) {
  .header-bar {
    gap: var(--space-2);
    padding: 6px 7px 6px 14px;
  }

  .brand-note { display: none; }

  .nav-toggle { display: inline-flex; }

  .header-meta { display: none; }

  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + var(--space-1));
    left: var(--gutter);
    right: var(--gutter);
    z-index: 8;
    padding: var(--space-2);
    border: var(--border-thick) solid var(--color-ink);
    border-radius: var(--radius-lg);
    background-color: var(--color-surface);
  }

  .site-nav[data-open="true"] { display: block; }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-link {
    display: block;
    padding: 12px 20px;
    border-radius: var(--radius-pill);
    font-size: var(--text-base);
  }

  .header-tools {
    flex-wrap: nowrap;
    overflow-x: auto;
    padding-bottom: 2px;
    scrollbar-width: none;
  }

  .header-tools::-webkit-scrollbar { display: none; }

  .grid--8,
  .grid--3,
  .grid--4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-top { grid-template-columns: minmax(0, 1fr); gap: var(--space-4); }
}

@media (max-width: 640px) {
  .container { padding-inline: 20px; }
  .section { padding-block: var(--space-8); }
  .section--lg { padding-block: var(--section-y); }

  .grid--8,
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: minmax(0, 1fr); }

  .footer-cols { grid-template-columns: minmax(0, 1fr); }
  .footer-contact { flex-direction: column; gap: var(--space-2); }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .footer-cut::after { width: 62%; }
}

/* ===== 13 可访问性与降级 ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  html { scroll-behavior: auto; }

  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }

  .scroll-progress { transition: none; }
}