/* ============================================================
   闲逸麻将网址 · 全站共享样式表 /assets/site.css
   风格：柔和渐变 · 档案卡式信息层 · 中低密度纵向流
   ============================================================ */

:root {
  --color-surface: #fafafa;
  --color-surface-alt: #f1f1f1;
  --color-surface-deep: #e3e5e3;
  --color-ink: #3e4b3e;
  --color-ink-soft: #607260;
  --color-ink-muted: #768976;
  --color-line: #d8dad8;
  --color-primary: #388636;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #dfeadf;
  --color-accent: #1d8642;
  --color-accent-ink: #ffffff;
  --color-highlight: #d2e5d9;
  --color-focus: #138139;
  --color-contrast-surface: #131c13;
  --color-contrast-ink: #e4e7e4;
  --color-contrast-line: #414941;
  --color-contrast-accent: #2dd267;
  --overlay-scrim: linear-gradient(180deg, rgba(19, 28, 19, 0.35) 0%, rgba(19, 28, 19, 0.72) 55%, rgba(19, 28, 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: 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, 6.2vw, 80px);
  --text-figure: clamp(28px, 4.5vw, 58px);
  --weight-heading: 641;
  --weight-body: 400;
  --leading-body: 1.82;
  --leading-heading: 1.25;
  --tracking-heading: 0.009em;
  --radius-sm: 14px;
  --radius-md: 16px;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 1px;
  --shadow-1: 0 6px 18px rgba(62, 75, 62, 0.08);
  --shadow-2: 0 18px 44px rgba(62, 75, 62, 0.14);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1180px;
  --measure: 67ch;
  --gutter: 16px;
  --section-y: 107px;
  --section-y-lg: 150px;
}

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  padding-bottom: calc(var(--space-8) + var(--space-4));
  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;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img, svg, video, canvas { display: block; max-width: 100%; }
img { height: auto; }
button, input, select, textarea { font: inherit; color: inherit; }
figure { margin: 0; }
p { margin: 0 0 var(--space-2); }
ul, ol { margin: 0; padding: 0; list-style: none; }
hr { border: 0; border-top: var(--border-thin) solid var(--color-line); margin: var(--space-4) 0; }

/* ---------- 2. 排版 ---------- */
h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2);
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}
h1 { font-size: var(--text-2xl); }
h2 { font-size: var(--text-xl); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 200ms ease, border-color 200ms ease, background-color 200ms ease;
}
a:hover { text-decoration: underline; text-underline-offset: 0.22em; }

strong, b { font-weight: var(--weight-heading); color: var(--color-ink); }
small { font-size: var(--text-xs); }

: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);
}

:where(section, article, div, header, footer)[id] { scroll-margin-top: 104px; }

.visually-hidden {
  position: absolute !important;
  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;
}

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

/* ---------- 3. 布局骨架 ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }
.section--tight { padding-block: var(--space-6); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-2) var(--space-4);
  margin-bottom: var(--space-6);
}
.section-title { font-size: var(--text-2xl); margin: 0; }

.grid { display: grid; gap: var(--space-4); }
.grid--12 { 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-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--color-primary);
  flex: none;
}

.prose { max-width: var(--measure); color: var(--color-ink-soft); }
.prose h2, .prose h3, .prose h4 { color: var(--color-ink); }
.prose h2 { font-size: var(--text-xl); margin-top: var(--space-6); }
.prose h3 { font-size: var(--text-lg); margin-top: var(--space-4); }
.prose ul, .prose ol { list-style: disc; padding-left: 1.3em; margin: 0 0 var(--space-3); }
.prose ol { list-style: decimal; }
.prose li { margin-bottom: 6px; }
.prose strong { color: var(--color-ink); }

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

.band {
  background: var(--color-surface-alt);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 4vw, 48px);
}

.inset-frame {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
}

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

/* ---------- 4. 通用按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: 12px 22px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform 220ms ease, background-color 220ms ease, border-color 220ms ease, box-shadow 220ms ease, color 220ms ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background-image: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
  background-color: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { box-shadow: var(--shadow-2); transform: translateY(-2px); }

.btn--ghost {
  background: var(--color-surface);
  border-color: var(--color-line);
  color: var(--color-ink);
}
.btn--ghost:hover { border-color: var(--color-primary); color: var(--color-accent); }

.btn--quiet {
  background: var(--color-primary-soft);
  color: var(--color-accent);
}
.btn--quiet:hover { background: var(--color-highlight); color: var(--color-accent); }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  list-style: none;
  margin: 0;
  padding: 0;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 13px;
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 20%, transparent);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-accent);
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: background-color 200ms ease, color 200ms ease, border-color 200ms ease;
}
.tag:hover { background: var(--color-highlight); }
.tag[aria-pressed="true"],
.tag.is-active {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: var(--color-accent);
}
.tag--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  border-color: transparent;
  cursor: default;
}
.tag--muted {
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  border-color: transparent;
}

/* ---------- 5. 资料卡 ---------- */
.card {
  background: var(--color-surface);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  box-shadow: var(--shadow-1);
  transition: transform 240ms ease, box-shadow 240ms ease, border-color 240ms ease;
}
.card--soft { background: var(--color-surface-alt); }
.card--flat { box-shadow: none; }
.card:hover { border-color: color-mix(in srgb, var(--color-primary) 34%, var(--color-line)); }
.card-title {
  margin: 0 0 var(--space-1);
  font-size: var(--text-lg);
  color: var(--color-ink);
}
.card-text {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.card-meta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-ink-muted);
}

/* ---------- 6. 面包屑 ---------- */
.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  margin: 0 0 var(--space-3);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}
.breadcrumbs li { display: inline-flex; align-items: center; gap: var(--space-1); }
.breadcrumbs li + li::before {
  content: "";
  width: 10px;
  height: 1px;
  background: var(--color-line);
  flex: none;
}
.crumb { color: var(--color-ink-soft); }
.crumb:hover { color: var(--color-accent); }
.crumb[aria-current="page"] { color: var(--color-ink); }

/* ---------- 7. 图片容器（供页面阶段放置资源） ---------- */
.media-frame {
  position: relative;
  display: block;
  padding: 10px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-1);
  overflow: hidden;
}
.media-frame__shot,
.media-frame > img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  border-radius: calc(var(--radius-md) - 6px);
  object-fit: cover;
  background-image: linear-gradient(150deg, var(--color-primary-soft) 0%, var(--color-highlight) 58%, var(--color-surface) 100%);
  background-color: var(--color-highlight);
}
.media-frame--wide .media-frame__shot,
.media-frame--wide > img { aspect-ratio: 16 / 9; }
.media-frame--tall .media-frame__shot,
.media-frame--tall > img { aspect-ratio: 3 / 4; }
.media-frame--square .media-frame__shot,
.media-frame--square > img { aspect-ratio: 1 / 1; }

.media-frame__scrim {
  position: absolute;
  inset: 10px;
  border-radius: calc(var(--radius-md) - 6px);
  background: var(--overlay-scrim);
  pointer-events: none;
}
.media-frame__caption {
  position: absolute;
  left: clamp(22px, 5%, 34px);
  right: clamp(22px, 5%, 34px);
  bottom: clamp(22px, 5%, 34px);
  z-index: 2;
  margin: 0;
  color: var(--color-contrast-ink);
  font-size: var(--text-sm);
  line-height: 1.7;
}
.media-frame__caption strong { color: var(--color-contrast-accent); }

/* ---------- 8. 页头 ---------- */
.skip-link {
  position: absolute;
  left: var(--space-3);
  top: -120px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-size: var(--text-sm);
  transition: top 200ms ease;
}
.skip-link:focus { top: 0; text-decoration: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: color-mix(in srgb, var(--color-surface) 88%, transparent);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  backdrop-filter: saturate(150%) blur(12px);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.header-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: color-mix(in srgb, var(--color-line) 60%, transparent);
  overflow: hidden;
}
.header-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  border-radius: 0 2px 2px 0;
  background-image: linear-gradient(90deg, var(--color-primary) 0%, var(--color-accent) 100%);
  background-color: var(--color-primary);
  transition: width 120ms linear;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  width: 100%;
  max-width: var(--container);
  min-height: 76px;
  margin-inline: auto;
  padding: var(--space-2) clamp(16px, 4vw, 32px);
  transition: min-height 240ms ease;
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
  color: var(--color-ink);
}
.brand-lockup:hover { text-decoration: none; color: var(--color-ink); }

.brand-mark {
  position: relative;
  flex: none;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 42%, transparent);
  background-image: linear-gradient(145deg, var(--color-primary) 0%, var(--color-highlight) 100%);
  background-color: var(--color-primary);
  box-shadow: var(--shadow-1);
}
.brand-mark::before,
.brand-mark::after {
  content: "";
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary-ink);
}
.brand-mark::before { top: 9px; left: 9px; }
.brand-mark::after { bottom: 9px; right: 9px; }

.brand-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.2;
}
.brand-name {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
  white-space: nowrap;
  transition: font-size 240ms ease;
}
.brand-tagline {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-ink-muted);
  white-space: nowrap;
  transition: opacity 240ms ease, transform 240ms ease, height 240ms ease;
}

.header-tail {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

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

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 9px 15px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-pill);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  white-space: nowrap;
  transition: background-color 220ms ease, color 220ms ease, border-color 220ms ease;
}
.nav-link:hover {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 22%, transparent);
  color: var(--color-accent);
  text-decoration: none;
}
.nav-link[aria-current="page"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}
.nav-link[aria-current="page"]:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: var(--space-1);
  padding: 8px 16px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: border-color 220ms ease, color 220ms ease, background-color 220ms ease;
}
.nav-toggle:hover {
  border-color: var(--color-primary);
  color: var(--color-accent);
  background: var(--color-primary-soft);
}
.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  width: 16px;
  flex: none;
}
.nav-toggle-bars span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 220ms ease, opacity 220ms ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
.nav-toggle-label { line-height: 1; }

.site-header.is-condensed .header-inner { min-height: 62px; }
.site-header.is-condensed .brand-name { font-size: var(--text-base); }
.site-header.is-condensed .brand-tagline { opacity: 0; transform: translateY(-4px); height: 0; overflow: hidden; }

/* ---------- 9. 页脚 ---------- */
.site-footer {
  margin-top: var(--section-y);
  padding-block: var(--space-8) var(--space-6);
  background-color: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.site-footer h2, .site-footer h3 { color: var(--color-contrast-ink); }

.footer-inner {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
}
.footer-brand { min-width: 0; }
.footer-mark {
  display: block;
  width: 22px;
  height: 22px;
  margin-bottom: var(--space-2);
  border-radius: 6px;
  background-image: linear-gradient(140deg, var(--color-primary) 0%, var(--color-contrast-accent) 100%);
  background-color: var(--color-primary);
}
.footer-brand-name {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-contrast-ink);
}
.footer-brand-line {
  margin: 6px 0 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
}

.footer-stamp {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  text-align: right;
}
.footer-stamp-label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  color: color-mix(in srgb, var(--color-contrast-ink) 56%, transparent);
}
.footer-stamp-value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  color: var(--color-contrast-accent);
}

.footer-rule {
  position: relative;
  height: 26px;
  margin-block: var(--space-4);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}
.footer-rule-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 10px;
  background-image: repeating-linear-gradient(
    to right,
    var(--color-contrast-line) 0,
    var(--color-contrast-line) 1px,
    transparent 1px,
    transparent 46px
  );
}
.footer-rule-ticks {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: color-mix(in srgb, var(--color-contrast-line) 70%, transparent);
}

.footer-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-item {
  display: grid;
  grid-template-columns: 132px minmax(0, 1fr);
  gap: var(--space-2);
  align-items: baseline;
  padding: 14px 0;
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}
.footer-key {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 58%, transparent);
}
.footer-value {
  font-size: var(--text-sm);
  color: var(--color-contrast-ink);
  word-break: break-word;
}
.footer-value--accent {
  font-family: var(--font-mono);
  color: var(--color-contrast-accent);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  margin-top: var(--space-4);
  font-size: var(--text-xs);
  color: color-mix(in srgb, var(--color-contrast-ink) 64%, transparent);
}
.footer-legal-link {
  color: var(--color-contrast-ink);
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: var(--color-contrast-line);
}
.footer-legal-link:hover {
  color: var(--color-contrast-accent);
  text-decoration-color: currentColor;
}
.footer-legal-note { font-family: var(--font-mono); letter-spacing: 0.04em; }

/* ---------- 10. 固定书签条 ---------- */
.bookmark-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
  -webkit-backdrop-filter: saturate(150%) blur(12px);
  backdrop-filter: saturate(150%) blur(12px);
  border-top: var(--border-thin) solid var(--color-line);
  box-shadow: 0 -8px 24px rgba(62, 75, 62, 0.06);
}
.bookmark-inner {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding: 9px clamp(16px, 4vw, 32px);
  overflow-x: auto;
  scrollbar-width: none;
}
.bookmark-inner::-webkit-scrollbar { display: none; }

.bookmark-flag {
  flex: none;
  display: inline-flex;
  align-items: center;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
}
.bookmark-link {
  flex: none;
  padding: 7px 14px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-ink);
  font-size: var(--text-sm);
  white-space: nowrap;
  transition: border-color 220ms ease, color 220ms ease, background-color 220ms ease;
}
.bookmark-link:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  color: var(--color-accent);
  text-decoration: none;
}
.bookmark-hint {
  flex: none;
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

/* ---------- 11. 动效钩子 ---------- */
[data-reveal] { transition: opacity 280ms ease, transform 280ms ease; }
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
}
.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

[data-section-link][aria-current="true"] {
  color: var(--color-accent);
  font-weight: var(--weight-heading);
}

[data-filter-target][hidden] { display: none !important; }

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1080px) {
  :root { --section-y: 88px; --section-y-lg: 118px; }
  .nav-link { padding: 8px 12px; }
}

@media (max-width: 1024px) {
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-3, .span-4, .span-5 { grid-column: span 3; }
  .span-6, .span-7, .span-8, .span-9, .span-12 { grid-column: span 6; }
}

@media (max-width: 860px) {
  .header-inner { min-height: 66px; }
  .brand-tagline { display: none; }
  .brand-name { font-size: var(--text-base); }
  .nav-toggle { display: inline-flex; }
  .header-tail { gap: var(--space-1); }

  .primary-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    padding: var(--space-2) clamp(16px, 4vw, 32px) var(--space-3);
    background: var(--color-surface);
    border-bottom: var(--border-thin) solid var(--color-line);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-2);
  }
  .primary-nav[data-open="true"] { display: block; }
  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }
  .nav-link {
    justify-content: flex-start;
    width: 100%;
    padding: 13px var(--space-2);
    border-radius: var(--radius-sm);
    font-size: var(--text-base);
  }

  .footer-top { align-items: flex-start; }
  .footer-stamp { align-items: flex-start; text-align: left; }
  .bookmark-hint { display: none; }
  .bookmark-inner { flex-wrap: nowrap; }
}

@media (max-width: 640px) {
  :root { --section-y: 64px; --section-y-lg: 84px; }
  .grid--12 { grid-template-columns: minmax(0, 1fr); }
  .grid--12 > * { grid-column: 1 / -1; }
  .footer-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
  .bookmark-link { font-size: var(--text-xs); padding: 6px 12px; }
  .btn { width: 100%; }
}

/* ---------- 13. 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .js-reveal [data-reveal] { opacity: 1; transform: none; }
  .btn--primary:hover { transform: none; }
}

@media print {
  .site-header, .bookmark-bar, .nav-toggle { display: none !important; }
  body { padding-bottom: 0; }
}