/* ==========================================================================
   365正真赛场 · 全站共享样式
   路径：/assets/site.css
   ========================================================================== */

:root {
  --color-surface: #f7f7f7;
  --color-surface-alt: #eeeeee;
  --color-surface-deep: #e2e2e1;
  --color-ink: #4c483e;
  --color-ink-soft: #736c5f;
  --color-ink-muted: #8a8475;
  --color-line: #d8d8d6;
  --color-primary: #8f7233;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #e8e4dc;
  --color-accent: #c6521b;
  --color-accent-ink: #ffffff;
  --color-highlight: #eed9cf;
  --color-focus: #be470e;
  --color-contrast-surface: #231f17;
  --color-contrast-ink: #e7e6e4;
  --color-contrast-line: #4e4b44;
  --color-contrast-accent: #e15e1e;
  --overlay-scrim: linear-gradient(180deg, rgba(35, 31, 23, 0.35) 0%, rgba(35, 31, 23, 0.72) 55%, rgba(35, 31, 23, 0.92) 100%);
  --font-heading: "Songti SC", "Source Han Serif SC", "Noto Serif SC", SimSun, serif;
  --font-body: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", sans-serif;
  --font-mono: ui-monospace, Menlo, Consolas, monospace;
  --text-xs: 10.4px;
  --text-sm: 13.9px;
  --text-base: 16px;
  --text-lg: 21.3px;
  --text-xl: 28.4px;
  --text-2xl: 37.9px;
  --text-3xl: 50.5px;
  --text-4xl: 67.3px;
  --text-display: clamp(34px, 6.5vw, 83px);
  --text-figure: clamp(28px, 4.7vw, 60px);
  --weight-heading: 670;
  --weight-body: 400;
  --leading-body: 1.82;
  --leading-heading: 1.18;
  --tracking-heading: -0.0em;
  --radius-sm: 10px;
  --radius-md: 12px;
  --radius-lg: 13px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(76, 72, 62, 0.08);
  --shadow-2: 0 18px 44px rgba(76, 72, 62, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1140px;
  --measure: 73ch;
  --gutter: 24px;
  --section-y: 104px;
  --section-y-lg: 146px;
}

/* --------------------------------------------------------------------------
   1. 基础重置
   -------------------------------------------------------------------------- */
*,
*::before,
*::after { box-sizing: border-box; }

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: 148px;
}

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol {
  margin: 0;
}

ul[class],
ol[class] {
  padding: 0;
  list-style: none;
}

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

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

button {
  padding: 0;
  background: none;
  border: 0;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

table {
  width: 100%;
  border-collapse: collapse;
  border-spacing: 0;
}

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

[hidden] { display: none !important; }

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: 4px;
}

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

/* --------------------------------------------------------------------------
   2. 页面基调与中文排版
   -------------------------------------------------------------------------- */
body {
  position: relative;
  isolation: isolate;
  min-height: 100vh;
  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);
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* 纸纹质感：固定在视口上的双层微点阵 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image:
    radial-gradient(rgba(76, 72, 62, 0.055) 1px, transparent 1px),
    radial-gradient(rgba(143, 114, 51, 0.045) 1px, transparent 1px);
  background-size: 3px 3px, 7px 7px;
  background-position: 0 0, 2px 3px;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  text-wrap: balance;
}

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 { text-wrap: pretty; }

strong { font-weight: 600; }

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

/* --------------------------------------------------------------------------
   3. 版面骨架
   -------------------------------------------------------------------------- */
.wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.wrap--flush { padding-inline: 0; }

.wrap--narrow {
  max-width: calc(var(--measure) + var(--gutter) * 2);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-8); }
.section--top-flush { padding-top: 0; }

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

.section--dark {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.section--dark h1,
.section--dark h2,
.section--dark h3,
.section--dark h4 { color: var(--color-contrast-ink); }

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
}

.grid--gap-lg { gap: var(--space-6); }
.grid--gap-sm { gap: var(--space-2); }
.grid--rows { align-items: start; }

.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: 1 / -1; }

.band {
  width: min(calc(100% - var(--gutter) * 2), var(--container));
  margin-inline: auto;
  padding: clamp(28px, 4.5vw, 64px);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-alt);
}

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

.band--primary-soft {
  background-color: var(--color-primary-soft);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 22%, transparent);
}

.band--dark {
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.band--dark h2,
.band--dark h3 { color: var(--color-contrast-ink); }

/* 错位边界 */
.offset-block { margin-inline: 0; }

@media (min-width: 900px) {
  .offset-block { margin-inline-start: calc(var(--gutter) * 2.5); }
  .offset-block--end {
    margin-inline-start: 0;
    margin-inline-end: calc(var(--gutter) * 2.5);
  }
}

/* --------------------------------------------------------------------------
   4. 文本组件
   -------------------------------------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-primary);
  flex: 0 0 auto;
}

.eyebrow--accent { color: var(--color-accent); }
.eyebrow--accent::before { background-color: var(--color-accent); }

.display-title {
  font-family: var(--font-heading);
  font-size: var(--text-display);
  font-weight: var(--weight-heading);
  line-height: 1.04;
  letter-spacing: -0.025em;
}

.lead {
  font-size: var(--text-lg);
  line-height: 1.72;
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.section-index {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.24em;
  color: var(--color-primary);
}

.section-index::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--color-line), transparent);
}

.rule-note {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-3);
  color: var(--color-ink-soft);
}

.rule-note--primary { border-left-color: var(--color-primary); }

.prose {
  max-width: var(--measure);
  color: var(--color-ink-soft);
}

.prose > * + * { margin-top: var(--space-3); }
.prose h2 { margin-top: var(--space-6); color: var(--color-ink); }
.prose h3 { margin-top: var(--space-4); color: var(--color-ink); }
.prose strong { color: var(--color-ink); }

.prose a {
  color: var(--color-primary);
  border-bottom: 1px solid color-mix(in srgb, var(--color-primary) 45%, transparent);
}

.prose a:hover { border-bottom-color: var(--color-primary); }

.prose ul,
.prose ol {
  padding-left: 1.25em;
  list-style: disc;
}

.prose ol { list-style: decimal; }
.prose li + li { margin-top: 6px; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   5. 按钮与标签
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  min-height: 44px;
  padding: 10px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  line-height: 1.2;
  text-align: center;
  transition: background-color 160ms ease, color 160ms ease,
              border-color 160ms ease, transform 160ms ease, box-shadow 160ms ease;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}

.btn--primary:hover {
  background-color: color-mix(in srgb, var(--color-primary) 82%, var(--color-contrast-surface));
  box-shadow: var(--shadow-2);
}

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

.btn--accent:hover {
  background-color: color-mix(in srgb, var(--color-accent) 84%, var(--color-contrast-surface));
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-ink);
  border-color: var(--color-line);
}

.btn--ghost:hover {
  background-color: var(--color-primary-soft);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn--on-dark {
  background-color: transparent;
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.btn--on-dark:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 11px;
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  line-height: 1.7;
}

.tag--primary {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
}

.tag--accent {
  background-color: var(--color-highlight);
  color: var(--color-focus);
}

/* 筛选条 */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface-alt);
}

.filter-btn {
  padding: 7px 16px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-soft);
  transition: background-color 160ms ease, color 160ms ease;
}

.filter-btn:hover {
  background-color: var(--color-surface);
  color: var(--color-ink);
}

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

/* --------------------------------------------------------------------------
   6. 卡片、面板与数据
   -------------------------------------------------------------------------- */
.card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
  transition: box-shadow 200ms ease, transform 200ms ease, border-color 200ms ease;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
  border-color: color-mix(in srgb, var(--color-primary) 32%, var(--color-line));
}

.card--flat { box-shadow: none; }
.card--flat:hover { transform: none; box-shadow: none; }

.card--warm {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 22%, var(--color-line));
}

.card--dark {
  background-color: var(--color-contrast-surface);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.card--dark .card-title { color: var(--color-contrast-ink); }
.card--dark .card-meta { color: color-mix(in srgb, var(--color-contrast-ink) 70%, transparent); }

.card-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.35;
}

.card-meta {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.dark-panel {
  padding: clamp(28px, 4.5vw, 56px);
  border-radius: var(--radius-lg);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.dark-panel h2,
.dark-panel h3,
.dark-panel h4 { color: var(--color-contrast-ink); }

.dark-panel p { color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent); }

.dark-panel .eyebrow { color: color-mix(in srgb, var(--color-contrast-ink) 68%, transparent); }
.dark-panel .eyebrow::before { background-color: var(--color-contrast-accent); }

.dark-panel .rule-note {
  border-left-color: var(--color-contrast-accent);
  color: color-mix(in srgb, var(--color-contrast-ink) 82%, transparent);
}

.dark-panel .stat-value { color: var(--color-contrast-accent); }
.dark-panel .stat-label { color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent); }

.dark-divider {
  border: 0;
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-figure);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
  color: var(--color-primary);
}

.stat-label {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
}

.data-table {
  width: 100%;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  font-size: var(--text-sm);
  background-color: var(--color-surface);
}

.data-table caption {
  padding: 0 0 10px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.data-table th,
.data-table td {
  padding: 12px 14px;
  text-align: left;
  vertical-align: top;
  border-bottom: var(--border-thin) solid var(--color-line);
}

.data-table thead th {
  background-color: var(--color-primary-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-ink);
}

.data-table tbody tr:nth-child(even) { background-color: var(--color-surface-alt); }
.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td { border-bottom: 0; }

.data-table .num,
.data-table td.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

.data-table .is-changed {
  color: var(--color-accent);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   7. 图片容器（页面阶段放置素材）
   -------------------------------------------------------------------------- */
.figure {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background-color: var(--color-surface-deep);
  box-shadow: var(--shadow-1);
}

.figure > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.figure--4x3 { aspect-ratio: 4 / 3; }
.figure--16x9 { aspect-ratio: 16 / 9; }
.figure--1x1 { aspect-ratio: 1 / 1; }
.figure--3x4 { aspect-ratio: 3 / 4; }
.figure--wide { aspect-ratio: 21 / 9; }

.figure--auto { aspect-ratio: auto; }
.figure--auto > img { height: auto; }

/* 叠色处理：与品牌暖调统一 */
.figure--tint > img {
  filter: saturate(0.5) contrast(1.06) brightness(0.97);
}

.figure--tint::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background-color: color-mix(in srgb, var(--color-primary) 28%, transparent);
  mix-blend-mode: multiply;
}

/* 图上放字必须叠加遮罩 */
.figure-scrim {
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background: var(--overlay-scrim);
}

.figure-caption {
  position: absolute;
  z-index: 3;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
}

.figure-caption-text {
  font-family: var(--font-heading);
  font-size: var(--text-base);
  line-height: 1.5;
}

.figure-caption-meta {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: color-mix(in srgb, var(--color-contrast-ink) 72%, transparent);
}

.figure--placeholder {
  display: grid;
  place-items: center;
  aspect-ratio: 4 / 3;
  background-color: var(--color-surface-deep);
  background-image: linear-gradient(
    135deg,
    color-mix(in srgb, var(--color-primary) 12%, transparent) 0 25%,
    transparent 25% 50%,
    color-mix(in srgb, var(--color-primary) 12%, transparent) 50% 75%,
    transparent 75% 100%
  );
  background-size: 48px 48px;
}

/* --------------------------------------------------------------------------
   8. 面包屑
   -------------------------------------------------------------------------- */
.crumbs {
  max-width: var(--container);
  margin-inline: auto;
  padding: var(--space-4) var(--gutter) 0;
}

.crumbs-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

.crumbs-list li + li::before {
  content: "/";
  margin-inline: 10px;
  color: var(--color-line);
}

.crumbs-list a { transition: color 160ms ease; }
.crumbs-list a:hover { color: var(--color-primary); }
.crumbs-list [aria-current="page"] { color: var(--color-ink); }

/* --------------------------------------------------------------------------
   9. 站点头部
   -------------------------------------------------------------------------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  transform: translateY(-200%);
  transition: transform 180ms ease;
}

.skip-link:focus {
  transform: translateY(0);
  outline-color: var(--color-contrast-accent);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 90;
  background-color: color-mix(in srgb, var(--color-surface) 90%, transparent);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  backdrop-filter: saturate(150%) blur(12px);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: var(--container);
  min-height: 68px;
  margin-inline: auto;
  padding: 12px var(--gutter);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
  box-shadow: var(--shadow-1);
}

.brand-copy {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--color-ink);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  margin-inline-start: auto;
  padding: 9px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background-color: var(--color-surface);
  font-size: var(--text-sm);
  color: var(--color-ink);
  transition: border-color 160ms ease, color 160ms ease;
}

.nav-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }

.nav-toggle-bars {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 10px;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  height: 1.6px;
  border-radius: 2px;
  background-color: currentColor;
  transition: transform 180ms ease, top 180ms ease;
}

.nav-toggle-bars::before { top: 0; }
.nav-toggle-bars::after { top: 8px; }

[data-nav-toggle][aria-expanded="true"] .nav-toggle-bars::before {
  top: 4px;
  transform: rotate(45deg);
}

[data-nav-toggle][aria-expanded="true"] .nav-toggle-bars::after {
  top: 4px;
  transform: rotate(-45deg);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-inline-start: auto;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 13px;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  color: var(--color-ink-soft);
  transition: background-color 160ms ease, color 160ms ease;
}

.nav-link:hover {
  background-color: var(--color-primary-soft);
  color: var(--color-ink);
}

.nav-link[aria-current="page"] {
  background-color: var(--color-primary-soft);
  color: var(--color-primary);
  font-weight: 600;
}

.nav-foot { display: flex; align-items: center; }

.nav-cta { white-space: nowrap; }

/* 头部赛季条 */
.header-strip {
  border-top: var(--border-thin) solid var(--color-line);
  background-color: var(--color-surface-alt);
}

.strip-inner {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  max-width: var(--container);
  margin-inline: auto;
  padding: 6px var(--gutter);
}

.season-label {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: var(--color-ink-muted);
}

.season-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1 1 auto;
  min-width: 0;
  padding-block: 2px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.season-switch::-webkit-scrollbar { display: none; }

.season-btn {
  flex: 0 0 auto;
  scroll-snap-align: start;
  padding: 6px 15px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.07em;
  white-space: nowrap;
  color: var(--color-ink-soft);
  transition: background-color 160ms ease, color 160ms ease, border-color 160ms ease;
}

.season-btn:hover {
  border-color: var(--color-line);
  color: var(--color-ink);
}

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

/* 阅读进度 */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  transition: transform 120ms linear;
  pointer-events: none;
}

/* --------------------------------------------------------------------------
   10. 站点页脚（卡片式）
   -------------------------------------------------------------------------- */
.site-footer {
  margin-top: var(--section-y);
  padding-block: var(--space-8) var(--space-6);
  border-top: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  background-color: var(--color-surface-alt);
}

.footer-wrap {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-3);
  align-items: stretch;
}

.footer-card {
  grid-column: span 3;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-4);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  background-color: var(--color-surface);
  box-shadow: var(--shadow-1);
}

.footer-card--warm {
  background-color: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 24%, var(--color-line));
}

.footer-mark {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: var(--radius-sm);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.footer-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: 0.02em;
}

.footer-heading {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: var(--weight-heading);
  letter-spacing: 0.05em;
  color: var(--color-ink);
}

.footer-heading::before {
  content: "";
  flex: 0 0 auto;
  width: 14px;
  height: 2px;
  border-radius: 2px;
  background-color: var(--color-primary);
}

.footer-text {
  font-size: var(--text-sm);
  line-height: 1.75;
  color: var(--color-ink-soft);
}

.footer-note {
  font-size: var(--text-xs);
  line-height: 1.7;
  color: var(--color-ink-muted);
}

.fact-list {
  display: grid;
  gap: 8px;
  margin-top: 2px;
}

.fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding-bottom: 7px;
  border-bottom: var(--border-thin) dashed var(--color-line);
}

.fact:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.fact-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: var(--color-ink-muted);
  white-space: nowrap;
}

.fact-value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  text-align: right;
  color: var(--color-primary);
  margin-inline-start: 0;
}

.footer-link-list {
  display: grid;
  gap: 8px;
}

.footer-link {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: 1px solid transparent;
  transition: color 160ms ease, border-color 160ms ease;
}

.footer-link:hover {
  color: var(--color-primary);
  border-bottom-color: currentColor;
}

.footer-contact-line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.75;
  color: var(--color-ink-soft);
  word-break: break-word;
}

.footer-contact-key {
  display: inline-block;
  min-width: 36px;
  margin-inline-end: 6px;
  color: var(--color-ink-muted);
}

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-6);
  padding-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.footer-base-text {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-muted);
}

/* --------------------------------------------------------------------------
   11. 动效
   -------------------------------------------------------------------------- */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 560ms cubic-bezier(0.22, 0.7, 0.3, 1),
              transform 560ms cubic-bezier(0.22, 0.7, 0.3, 1);
}

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

.is-season-dim {
  opacity: 0.3;
  transition: opacity 160ms ease;
}

/* --------------------------------------------------------------------------
   12. 响应式
   -------------------------------------------------------------------------- */
@media (max-width: 1000px) {
  .span-3,
  .span-4,
  .span-5 { grid-column: span 6; }

  .span-7,
  .span-8 { grid-column: 1 / -1; }

  .footer-card { grid-column: span 6; }

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

  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 80;
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-2);
    margin-inline-start: 0;
    padding: var(--space-3) var(--gutter) var(--space-4);
    border-bottom: var(--border-thin) solid var(--color-line);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    background-color: var(--color-surface);
    box-shadow: var(--shadow-2);
  }

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

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    justify-content: flex-start;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
  }

  .nav-foot { display: flex; }
  .nav-cta { width: 100%; }

  .brand-sub { display: none; }
}

@media (max-width: 720px) {
  .section { padding-block: var(--space-8); }
  .section--lg { padding-block: var(--space-8); }

  .strip-inner {
    gap: var(--space-2);
    padding-inline: var(--gutter);
  }

  .season-label { display: none; }

  .display-title { line-height: 1.1; }

  .footer-base { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 640px) {
  .span-3,
  .span-4,
  .span-5,
  .span-6,
  .span-7,
  .span-8 { grid-column: 1 / -1; }

  .footer-card { grid-column: 1 / -1; }

  .data-table--stack { border: 0; }

  .data-table--stack thead { display: none; }

  .data-table--stack tbody tr {
    display: block;
    margin-bottom: var(--space-2);
    padding: 6px 0;
    border: var(--border-thin) solid var(--color-line);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
  }

  .data-table--stack tbody tr:nth-child(even) { background-color: var(--color-surface); }

  .data-table--stack th,
  .data-table--stack td {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    padding: 7px 12px;
    border-bottom: 0;
    text-align: right;
  }

  .data-table--stack td::before {
    content: attr(data-label);
    flex: 0 0 auto;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.08em;
    text-align: left;
    color: var(--color-ink-muted);
  }
}

/* --------------------------------------------------------------------------
   13. 动效偏好
   -------------------------------------------------------------------------- */
@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;
  }

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

  .btn:hover,
  .card:hover { transform: none; }
}