:root {
  --color-surface: #fdfdfd;
  --color-surface-alt: #f4f4f4;
  --color-surface-deep: #e9e7e7;
  --color-ink: #534746;
  --color-ink-soft: #7c6b6a;
  --color-ink-muted: #897876;
  --color-line: #dedcdc;
  --color-primary: #bf4d40;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f4e4e3;
  --color-accent: #bb5916;
  --color-accent-ink: #ffffff;
  --color-highlight: #f1dfd3;
  --color-focus: #bc530b;
  --color-contrast-surface: #1e1413;
  --color-contrast-ink: #e7e4e4;
  --color-contrast-line: #4a4241;
  --color-contrast-accent: #e46d1b;
  --overlay-scrim: linear-gradient(180deg, rgba(30, 20, 19, 0.35) 0%, rgba(30, 20, 19, 0.72) 55%, rgba(30, 20, 19, 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: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(34px, 6.8vw, 87px);
  --text-figure: clamp(28px, 4.9vw, 63px);
  --weight-heading: 789;
  --weight-body: 400;
  --leading-body: 1.75;
  --leading-heading: 1.19;
  --tracking-heading: 0.009em;
  --radius-sm: 14px;
  --radius-md: 17px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(83, 71, 70, 0.08);
  --shadow-2: 0 18px 44px rgba(83, 71, 70, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1200px;
  --measure: 69ch;
  --gutter: 32px;
  --section-y: 103px;
  --section-y-lg: 144px;
}

/* ===== 赛区色标：由 header 的赛区切换驱动 ===== */
html {
  --zone-accent: var(--color-primary);
}
html[data-zone="gz"] {
  --zone-accent: var(--color-accent);
}
html[data-zone="cd"] {
  --zone-accent: color-mix(in srgb, var(--color-accent) 58%, var(--color-primary) 42%);
}

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

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

img,
picture,
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;
}

ul, ol { margin: 0; padding: 0; list-style: none; }

h1, h2, h3, h4, h5, p, figure, blockquote { margin: 0; }

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

#main-content { scroll-margin-top: 132px; }

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

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

.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -80px;
  z-index: 90;
  padding: var(--space-2) var(--space-3);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  transition: top 200ms ease-out;
}
.skip-link:focus { top: var(--space-2); }

/* ===== 中文排版 ===== */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  line-height: var(--leading-heading);
  color: var(--color-ink);
}
h1 { font-size: var(--text-3xl); }
h2 { font-size: var(--text-2xl); }
h3 { font-size: var(--text-xl); }
h4 { font-size: var(--text-lg); }

p { max-width: var(--measure); }
.lede { font-size: var(--text-lg); color: var(--color-ink-soft); max-width: var(--measure); }
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0;
}
.eyebrow {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: var(--border-thin);
  background: var(--color-line);
}
.link-quiet {
  display: inline-block;
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink-soft);
  transition: color 200ms ease-out, border-color 200ms ease-out;
}
.link-quiet:hover { color: var(--color-primary); border-color: var(--color-primary); }

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

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--alt { background: var(--color-surface-alt); }
.section--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}
.section--deep h1,
.section--deep h2,
.section--deep h3,
.section--deep h4 { color: var(--color-contrast-ink); }
.section--deep .lede,
.section--deep .section-note { color: color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface)); }
.section--deep hr { border-top-color: var(--color-contrast-line); }
.section--deep .eyebrow { color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface)); }
.section--deep .eyebrow::before { background: var(--color-contrast-line); }

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

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-3);
  margin-bottom: var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.section--deep .section-head { border-bottom-color: var(--color-contrast-line); }
.section-title { font-size: var(--text-2xl); }
.section-title--lg { font-size: var(--text-3xl); }
.section-note {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
  max-width: 38ch;
}

.tick-rule {
  height: 8px;
  border-bottom: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 44px);
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: 44px 8px;
}
.section--deep .tick-rule {
  border-bottom-color: var(--color-contrast-line);
  background-image: repeating-linear-gradient(90deg, var(--color-contrast-line) 0 1px, transparent 1px 44px);
}

/* ===== 按钮 ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  transition: color 200ms ease-out, border-color 200ms ease-out, box-shadow 200ms ease-out, transform 200ms ease-out;
}
.btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn--primary {
  border-color: transparent;
  background: linear-gradient(120deg, var(--color-primary), var(--color-accent));
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { color: var(--color-primary-ink); transform: translateY(-1px); box-shadow: var(--shadow-2); }
.btn--ghost { background: transparent; }
.section--deep .btn {
  background: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}
.section--deep .btn:hover { border-color: var(--color-contrast-accent); color: var(--color-contrast-accent); }

/* ===== 面包屑 ===== */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.breadcrumb li { display: flex; align-items: center; gap: var(--space-2); }
.breadcrumb li + li::before {
  content: "/";
  color: var(--color-line);
}
.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-primary); }

/* ===== 面板与数据 ===== */
.panel {
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}
.panel--deep {
  background: color-mix(in srgb, var(--color-contrast-surface) 88%, var(--color-contrast-accent));
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
  box-shadow: none;
}
.panel-head {
  padding: var(--space-3) var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.panel--deep .panel-head { border-bottom-color: var(--color-contrast-line); }
.panel-body { padding: var(--space-4); }

.data-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--border-thin);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-primary-soft), var(--color-highlight));
  overflow: hidden;
}
.data-cell {
  padding: var(--space-3);
  border-left: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 20%, transparent);
}
.data-cell:first-child { border-left: 0; }
.data-key {
  display: block;
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-soft);
}
.data-value {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  line-height: 1.1;
  color: var(--color-ink);
}
.data-cell--fig .data-value { font-size: var(--text-figure); }
.section--deep .data-strip {
  background: linear-gradient(135deg, color-mix(in srgb, var(--color-contrast-surface) 80%, var(--color-contrast-accent)), var(--color-contrast-surface));
}
.section--deep .data-cell { border-left-color: var(--color-contrast-line); }
.section--deep .data-key { color: color-mix(in srgb, var(--color-contrast-ink) 62%, var(--color-contrast-surface)); }
.section--deep .data-value { color: var(--color-contrast-ink); }
.section--deep .data-cell--pulse .data-value { color: var(--color-contrast-accent); }

.aside-note {
  border-left: 2px solid var(--color-line);
  padding-left: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: 34ch;
}
.section--deep .aside-note { border-left-color: var(--color-contrast-line); color: color-mix(in srgb, var(--color-contrast-ink) 74%, var(--color-contrast-surface)); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 3px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  background: var(--color-surface);
}
.zone-tag::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--zone-accent);
}
.zone-tag[data-zone="sh"] { --zone-accent: var(--color-primary); }
.zone-tag[data-zone="gz"] { --zone-accent: var(--color-accent); }
.zone-tag[data-zone="cd"] { --zone-accent: color-mix(in srgb, var(--color-accent) 58%, var(--color-primary) 42%); }

/* ===== 目录 / 章节索引 ===== */
.spy-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: var(--text-sm);
}
.spy-list a {
  display: block;
  padding-left: var(--space-2);
  border-left: 2px solid var(--color-line);
  color: var(--color-ink-soft);
  transition: color 200ms ease-out, border-color 200ms ease-out;
}
.spy-list a:hover { color: var(--color-ink); }
.spy-list a[aria-current="true"] {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}
.section--deep .spy-list a { border-left-color: var(--color-contrast-line); color: color-mix(in srgb, var(--color-contrast-ink) 70%, var(--color-contrast-surface)); }
.section--deep .spy-list a[aria-current="true"] { color: var(--color-contrast-accent); border-left-color: var(--color-contrast-accent); }

/* ===== 图片容器 ===== */
.media-frame {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background: var(--color-surface-deep);
}
.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-16x9 { aspect-ratio: 16 / 9; }
.media-4x3 { aspect-ratio: 4 / 3; }
.media-3x2 { aspect-ratio: 3 / 2; }
.media-frame--paper {
  padding: var(--space-2);
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
}
.media-frame--paper img { border-radius: var(--radius-sm); }
.media-overlay {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media-caption {
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: var(--space-3);
  z-index: 2;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.5;
}
.section--deep .media-frame { border-color: var(--color-contrast-line); }

/* ===== 滚动显现 ===== */
.js-ready [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}
.js-ready [data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  transition: opacity 400ms ease-out, transform 400ms ease-out;
}

/* ===== 头部 ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--color-surface) 93%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
}
.progress-rail {
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--color-surface-deep);
  overflow: hidden;
}
.progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}
.header-frame {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.masthead {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: var(--space-3);
  padding-top: calc(var(--space-3) + 3px);
  padding-bottom: var(--space-2);
}
.masthead-zone { justify-self: start; }
.masthead-label {
  margin-bottom: 6px;
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
}
.zone-switch {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
}
.zone-switch.is-zone-shift .zone-chip { animation: zone-shift 240ms ease-out; }
@keyframes zone-shift {
  from { opacity: 0.5; transform: translateY(-3px); }
  to { opacity: 1; transform: none; }
}
.zone-chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 5px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: color-mix(in srgb, var(--color-surface) 70%, transparent);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  transition: color 200ms ease-out, border-color 200ms ease-out, background-color 200ms ease-out;
}
.zone-chip:hover { color: var(--color-ink); border-color: color-mix(in srgb, var(--color-primary) 40%, var(--color-line)); }
.zone-chip[aria-pressed="true"] {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--zone-accent) 48%, var(--color-line));
  background: color-mix(in srgb, var(--zone-accent) 12%, var(--color-surface));
}
.zone-dot {
  width: 7px;
  height: 7px;
  border-radius: var(--radius-pill);
  background: var(--color-ink-muted);
}
.zone-chip[data-zone="sh"] .zone-dot { background: var(--color-primary); }
.zone-chip[data-zone="gz"] .zone-dot { background: var(--color-accent); }
.zone-chip[data-zone="cd"] .zone-dot { background: color-mix(in srgb, var(--color-accent) 58%, var(--color-primary) 42%); }

.brand { text-align: center; }
.brand-link { display: inline-block; }
.brand-mark {
  display: block;
  width: 42px;
  height: 6px;
  margin: 0 auto var(--space-1);
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}
.brand-name {
  display: block;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-xl);
  letter-spacing: var(--tracking-heading);
  line-height: 1.15;
  white-space: nowrap;
}
.brand-tagline {
  margin: 4px auto 0;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}
.masthead-status {
  justify-self: end;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  text-align: right;
}
.status-line {
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
  max-width: none;
}
.status-key { letter-spacing: 0.14em; }
.status-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  color: var(--color-ink);
}
.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  margin-top: 4px;
  padding: 6px var(--space-2);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-ink-soft);
}
.nav-toggle-text { line-height: 1; }
.nav-toggle-bars {
  position: relative;
  width: 16px;
  height: 2px;
  background: currentColor;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: currentColor;
  transition: transform 200ms ease-out;
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }

.nav-band {
  position: relative;
  display: block;
  border-top: var(--border-thin) solid var(--color-line);
}
.nav-band::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 4px;
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 48px);
  background-repeat: repeat-x;
  background-size: 48px 4px;
  pointer-events: none;
}
.nav-list {
  display: flex;
  justify-content: center;
  gap: clamp(var(--space-2), 3.2vw, var(--space-6));
}
.nav-list a {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: var(--space-1);
  padding: var(--space-2) 0;
  font-size: var(--text-sm);
  letter-spacing: 0.05em;
  color: var(--color-ink-soft);
  transition: color 200ms ease-out;
}
.nav-list a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  transition: background-color 200ms ease-out;
}
.nav-list a:hover { color: var(--color-ink); }
.nav-list a:hover::after { background: var(--color-line); }
.nav-index {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.nav-list a[aria-current="page"] { color: var(--color-primary); }
.nav-list a[aria-current="page"] .nav-index { color: var(--color-primary); }
.nav-list a[aria-current="page"]::after {
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
}
.nav-label { white-space: nowrap; }

/* ===== 页脚 ===== */
.site-footer {
  background: var(--color-surface-alt);
  border-top: var(--border-thin) solid var(--color-line);
  color: var(--color-ink);
}
.footer-frame {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-6) var(--gutter) var(--space-4);
}
.footer-ruler {
  height: 10px;
  margin-bottom: var(--space-6);
  border-bottom: var(--border-thin) solid var(--color-line);
  background-image: repeating-linear-gradient(90deg, var(--color-line) 0 1px, transparent 1px 48px);
  background-repeat: repeat-x;
  background-position: left bottom;
  background-size: 48px 8px;
}
.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-3);
  padding-bottom: var(--space-4);
  border-bottom: var(--border-thin) solid var(--color-line);
}
.footer-brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-heading);
  line-height: 1.2;
}
.footer-brand-tag {
  margin-top: 6px;
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}
.footer-note {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  max-width: 40ch;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1.15fr 1.15fr;
  gap: var(--space-4);
  padding-block: var(--space-6);
}
.footer-block-title {
  margin-bottom: var(--space-3);
  padding-bottom: var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  font-weight: var(--weight-heading);
  letter-spacing: 0.2em;
  color: var(--color-ink-muted);
  line-height: 1.4;
}
.footer-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.5;
}
.footer-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  color: var(--color-ink-soft);
}
.footer-item-key {
  flex: none;
  min-width: 2.2em;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-list a {
  color: var(--color-ink);
  transition: color 200ms ease-out;
}
.footer-list a:hover { color: var(--color-primary); }
.footer-meta {
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-ink-soft);
  max-width: none;
  word-break: break-word;
}
.footer-meta-key {
  display: inline-block;
  min-width: 3.4em;
  margin-right: var(--space-1);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-4);
  border-top: var(--border-thin) solid var(--color-line);
  font-size: var(--text-xs);
  color: var(--color-ink-muted);
}
.footer-copy,
.footer-icp { max-width: none; }
.footer-icp { font-family: var(--font-mono); }
.legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}
.legal-links a {
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color 200ms ease-out, border-color 200ms ease-out;
}
.legal-links a:hover { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .span-3,
  .span-4 { grid-column: span 6; }
  .span-5,
  .span-7 { grid-column: span 12; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 900px) {
  .masthead {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "zone status";
    align-items: start;
    gap: var(--space-2) var(--space-3);
  }
  .brand { grid-area: brand; text-align: left; }
  .brand-link { display: inline-flex; align-items: center; gap: var(--space-2); }
  .brand-mark { width: 6px; height: 22px; margin: 0; border-radius: var(--radius-pill); background: linear-gradient(180deg, var(--color-primary), var(--color-accent)); }
  .brand-name { font-size: var(--text-lg); }
  .brand-tagline { margin-left: 0; }
  .masthead-zone { grid-area: zone; }
  .masthead-status { grid-area: status; }

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

  .nav-band { display: none; }
  .nav-band[data-open="true"] {
    display: block;
    animation: nav-drop 240ms ease-out;
  }
  @keyframes nav-drop {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: none; }
  }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }
  .nav-list li + li { border-top: var(--border-thin) solid var(--color-line); }
  .nav-list a {
    justify-content: flex-start;
    padding: var(--space-2) 0;
    font-size: var(--text-base);
  }
  .nav-list a::after { display: none; }
  .nav-index { min-width: 2.4em; }
}

@media (max-width: 720px) {
  .grid { gap: var(--space-4); }
  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8 { grid-column: span 12; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .footer-top { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .container,
  .header-frame,
  .footer-frame { padding-inline: var(--space-3); }
  .section { padding-block: var(--section-y); }
  .section--lg { padding-block: var(--section-y); }
  .panel-body { padding: var(--space-3); }
  .data-cell { padding: var(--space-2) var(--space-3); }
  .footer-legal { flex-direction: column; align-items: flex-start; }
}

@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;
  }
  .js-ready [data-reveal] {
    opacity: 1;
    transform: none;
  }
  .progress-bar { transition: none; }
  .zone-switch.is-zone-shift .zone-chip { animation: none; }
}