:root {
  --color-surface: #282428;
  --color-surface-alt: #373237;
  --color-surface-deep: #494349;
  --color-ink: #cbbecb;
  --color-ink-soft: #a18ca1;
  --color-ink-muted: #8b748b;
  --color-line: #454045;
  --color-primary: #d036d4;
  --color-primary-ink: #181118;
  --color-primary-soft: #402740;
  --color-accent: #23dc68;
  --color-accent-ink: #181118;
  --color-highlight: #274534;
  --color-focus: #16e965;
  --color-contrast-surface: #f3f1f3;
  --color-contrast-ink: #383338;
  --color-contrast-line: #cac7ca;
  --color-contrast-accent: #147b3a;
  --overlay-scrim: linear-gradient(180deg, rgba(243, 241, 243, 0.35) 0%, rgba(243, 241, 243, 0.72) 55%, rgba(243, 241, 243, 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(46px, 9.5vw, 121px);
  --text-figure: clamp(38px, 6.8vw, 87px);
  --weight-heading: 787;
  --weight-body: 400;
  --leading-body: 1.75;
  --leading-heading: 1.28;
  --tracking-heading: 0.009em;
  --radius-sm: 8px;
  --radius-md: 11px;
  --radius-lg: 14px;
  --radius-pill: 999px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: 0 0 0 1px rgba(35, 220, 104, 0.35);
  --shadow-2: 0 0 28px rgba(35, 220, 104, 0.35);
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1280px;
  --measure: 71ch;
  --gutter: 24px;
  --section-y: 96px;
  --section-y-lg: 134px;
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100%;
  background-color: var(--color-surface);
  background-image:
    radial-gradient(880px 520px at 8% -12%, color-mix(in srgb, var(--color-primary) 13%, transparent), transparent 64%),
    radial-gradient(760px 460px at 96% 0%, color-mix(in srgb, var(--color-accent) 7%, transparent), transparent 60%);
  background-repeat: no-repeat;
  background-attachment: fixed;
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  overflow-x: hidden;
  -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);
}

p { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
img, svg, video { display: block; max-width: 100%; }
table { border-collapse: collapse; width: 100%; }

:focus { outline: none; }
:focus-visible {
  outline: var(--border-thick) solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

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

[hidden] { display: none !important; }
.is-hidden { display: none !important; }

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

#main-content {
  position: relative;
  z-index: 1;
  display: block;
  scroll-margin-top: 96px;
}

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

.grid { display: grid; 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)); }

.stack > * + * { margin-top: var(--space-3); }

/* ============================================================
   Utilities
   ============================================================ */
.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.muted { color: var(--color-ink-soft); }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.hl {
  background: var(--color-highlight);
  color: var(--color-ink);
  padding: 0 .28em;
  border-radius: var(--radius-sm);
}

.u-mark {
  text-decoration: underline;
  text-decoration-color: var(--color-primary);
  text-decoration-thickness: 3px;
  text-underline-offset: 5px;
}

.figure-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.rule-double {
  height: 8px;
  border-top: var(--border-thick) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.rule-thick { border: 0; border-top: var(--border-thick) solid var(--color-line); margin: 0; }

/* ============================================================
   Skip link
   ============================================================ */
.skip-link {
  position: fixed;
  top: -100px;
  left: var(--space-3);
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .06em;
  transition: top .18s ease;
}
.skip-link:focus-visible { top: var(--space-3); }

/* ============================================================
   Header
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: color-mix(in srgb, var(--color-surface) 90%, transparent);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: var(--border-thick) solid var(--color-line);
  color: var(--color-ink);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  min-height: 72px;
  padding-block: var(--space-2);
}

/* Brand */
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  flex: 0 0 auto;
  color: var(--color-ink);
  border-radius: var(--radius-sm);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  flex: 0 0 auto;
  border-radius: var(--radius-sm);
  border: var(--border-thick) solid var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-1);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  line-height: 1;
}

.brand-text { display: flex; flex-direction: column; gap: 2px; }

.brand-name {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-lg);
  line-height: 1.1;
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.brand-tag {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  line-height: 1;
}

/* Nav */
.site-nav { flex: 1 1 auto; display: flex; justify-content: center; }

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

.nav-link {
  display: inline-block;
  position: relative;
  padding: 7px 11px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .04em;
  white-space: nowrap;
  transition: color .18s ease, border-color .18s ease, background-color .18s ease, box-shadow .18s ease;
}

.nav-link:hover {
  color: var(--color-ink);
  border-color: color-mix(in srgb, var(--color-line) 80%, var(--color-primary));
  background: var(--color-surface-alt);
}

.nav-link[aria-current="page"] {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-1);
}

/* Tools */
.header-tools {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 0 0 auto;
}

.view-switch {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  gap: 2px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-pill);
  background: var(--color-surface-alt);
}

.view-switch-btn {
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid transparent;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  color: var(--color-ink-muted);
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

.view-switch-btn:hover { color: var(--color-ink); }

.view-switch-btn[aria-pressed="true"] {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 58%, transparent);
  color: var(--color-primary);
}

.fav-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 15px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-accent);
  background: transparent;
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .05em;
  white-space: nowrap;
  transition: background-color .18s ease, color .18s ease, box-shadow .18s ease;
}

.fav-btn:hover { box-shadow: var(--shadow-1); }

.fav-btn[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  box-shadow: var(--shadow-2);
}

.fav-btn-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  flex: 0 0 auto;
}

.fav-btn.is-pulsing { animation: fav-pulse .62s ease-out; }

@keyframes fav-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--color-accent) 55%, transparent); }
  100% { box-shadow: 0 0 0 14px transparent; }
}

/* Mobile toggle */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .14em;
  text-transform: uppercase;
}

.nav-toggle[aria-expanded="true"] {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-1);
}

.nav-toggle-bars {
  display: inline-flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}

.nav-toggle-bars i {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .2s ease, opacity .2s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* Scroll progress */
.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -2px;
  z-index: 2;
  display: block;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
  box-shadow: 0 0 10px color-mix(in srgb, var(--color-accent) 55%, transparent);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  position: relative;
  z-index: 1;
  margin-top: var(--section-y);
  border-top: var(--border-thick) solid var(--color-line);
  background: color-mix(in srgb, var(--color-surface-alt) 68%, var(--color-surface));
  color: var(--color-ink);
}

.footer-inner { padding-block: var(--space-6) var(--space-4); }

.footer-top {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-6);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1 1 260px;
}

.footer-brand-line {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .14em;
  color: var(--color-ink-muted);
  text-transform: uppercase;
}

.footer-cols {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-6);
  flex: 2 1 520px;
  justify-content: flex-end;
}

.footer-col { min-width: 120px; }

.footer-col-title {
  margin-bottom: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.footer-links { display: flex; flex-direction: column; gap: 6px; }

.footer-link {
  display: inline-block;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  border-bottom: var(--border-thin) solid transparent;
  transition: color .18s ease, border-color .18s ease;
}

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

.footer-rule { margin-block: var(--space-6) var(--space-4); }

.footer-mega-wrap { display: flex; flex-direction: column; gap: var(--space-2); }

.footer-mega {
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  font-size: var(--text-display);
  line-height: .92;
  letter-spacing: -0.015em;
  color: var(--color-ink-soft);
  word-break: keep-all;
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .footer-mega {
    background-image: linear-gradient(96deg,
      color-mix(in srgb, var(--color-primary) 80%, var(--color-surface)) 0%,
      color-mix(in srgb, var(--color-accent) 68%, var(--color-surface)) 58%,
      var(--color-ink-muted) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
  }
}

.footer-mega-sub {
  max-width: var(--measure);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

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

.footer-contact {
  flex: 1 1 420px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .05em;
  color: var(--color-ink-muted);
  line-height: 1.9;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.footer-legal-item { display: block; }

.footer-icp,
.footer-copy {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .05em;
  color: var(--color-ink-muted);
}

/* ============================================================
   Section headings
   ============================================================ */
.sec-head {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-3);
  border-bottom: var(--border-thick) solid var(--color-line);
}

.sec-eyebrow {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.sec-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1;
  color: var(--color-primary);
  letter-spacing: .02em;
}

.sec-title { font-size: var(--text-3xl); color: var(--color-ink); }

.sec-sub {
  max-width: var(--measure);
  font-size: var(--text-base);
  color: var(--color-ink-soft);
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: 10px 20px;
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  color: var(--color-ink);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .04em;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease, box-shadow .18s ease;
}

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

.btn--primary {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-soft);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  box-shadow: var(--shadow-2);
}

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

.btn--ghost { background: transparent; }

/* ============================================================
   Tags & filters
   ============================================================ */
.tag-row { display: flex; flex-wrap: wrap; gap: var(--space-1); }

.tag {
  display: inline-block;
  padding: 3px 9px;
  border-radius: var(--radius-pill);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  text-transform: uppercase;
  white-space: nowrap;
}

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
  padding-block: var(--space-2);
  margin-bottom: var(--space-4);
  border-top: var(--border-thick) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.filter-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  border: var(--border-thin) solid transparent;
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: .05em;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}

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

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

.filter-count {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .12em;
  color: var(--color-ink-muted);
}

/* ============================================================
   Card
   ============================================================ */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-alt);
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

.card:hover {
  border-color: color-mix(in srgb, var(--color-primary) 58%, var(--color-line));
  box-shadow: var(--shadow-1);
}

.card-num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  letter-spacing: .14em;
  color: var(--color-primary);
}

.card-title { font-size: var(--text-lg); color: var(--color-ink); }
.card-text { font-size: var(--text-sm); color: var(--color-ink-soft); }

.card-meta {
  margin-top: auto;
  padding-top: var(--space-2);
  border-top: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  color: var(--color-ink-muted);
}

/* ============================================================
   Contrast block
   ============================================================ */
.contrast-block {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
}

.contrast-block .u-mark {
  text-decoration-color: var(--color-contrast-accent);
  color: var(--color-contrast-ink);
}

.contrast-block .tag {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.contrast-block .rule-double,
.contrast-block .rule-thick {
  border-color: var(--color-contrast-line);
}

/* ============================================================
   Media frame
   ============================================================ */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-lg);
  border: var(--border-thin) solid var(--color-line);
  background: var(--color-surface-deep);
}

.media-frame[data-ratio="3-2"] { aspect-ratio: 3 / 2; }
.media-frame[data-ratio="4-3"] { aspect-ratio: 4 / 3; }
.media-frame[data-ratio="1-1"] { aspect-ratio: 1 / 1; }
.media-frame[data-ratio="21-9"] { aspect-ratio: 21 / 9; }

.media-frame > img,
.media-frame > picture,
.media-frame > picture > img,
.media-frame > .media-fill {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--tilt { transform: rotate(-1.2deg); }

.media-scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.media-caption {
  position: absolute;
  left: var(--space-2);
  right: var(--space-2);
  bottom: var(--space-2);
  z-index: 2;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .08em;
  line-height: 1.6;
  color: var(--color-contrast-ink);
}

/* ============================================================
   Breadcrumb
   ============================================================ */
.breadcrumb { padding-block: var(--space-3); }

.breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-1);
}

.breadcrumb-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .1em;
  color: var(--color-ink-muted);
}

.breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  color: var(--color-line);
}

.breadcrumb-link { color: var(--color-ink-soft); transition: color .18s ease; }
.breadcrumb-link:hover { color: var(--color-accent); }
.breadcrumb-current { color: var(--color-primary); }

/* ============================================================
   Timeline
   ============================================================ */
.timeline {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  border-left: var(--border-thick) solid var(--color-line);
  padding-left: var(--space-3);
}

.timeline-item {
  position: relative;
  display: grid;
  gap: var(--space-1);
}

.timeline-marker {
  position: absolute;
  left: calc(-1 * var(--space-3) - 6px);
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-surface);
  border: var(--border-thick) solid var(--color-primary);
  box-shadow: var(--shadow-1);
}

.timeline-time {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.timeline-title { font-size: var(--text-xl); color: var(--color-ink); }
.timeline-text { max-width: var(--measure); font-size: var(--text-sm); color: var(--color-ink-soft); }

/* ============================================================
   Prose
   ============================================================ */
.prose { max-width: var(--measure); }

.prose > * + * { margin-top: var(--space-3); }

.prose h2 { font-size: var(--text-2xl); color: var(--color-ink); }
.prose h3 { font-size: var(--text-xl); color: var(--color-ink); }
.prose p { font-size: var(--text-base); color: var(--color-ink-soft); }
.prose strong { color: var(--color-ink); }
.prose a {
  color: var(--color-accent);
  border-bottom: var(--border-thin) solid currentColor;
}
.prose ul, .prose ol { padding-left: 1.25em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: var(--space-1); }
.prose li { color: var(--color-ink-soft); }
.prose blockquote {
  margin: 0;
  padding-left: var(--space-3);
  border-left: var(--border-thick) solid var(--color-primary);
  color: var(--color-ink);
}

/* ============================================================
   Reveal motion
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .5s ease, transform .5s ease;
}

.reveal.is-visible { opacity: 1; transform: none; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1180px) {
  .brand-tag { display: none; }
}

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-cols { justify-content: flex-start; }
}

@media (max-width: 960px) {
  .site-header { position: sticky; }

  .header-inner { flex-wrap: wrap; gap: var(--space-2); }

  .brand { margin-right: auto; }

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

  .site-nav {
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    display: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    max-height: calc(100vh - 84px);
    overflow-y: auto;
    padding: var(--space-3) var(--gutter) var(--space-4);
    background: var(--color-surface);
    border-top: var(--border-thin) solid var(--color-line);
    border-bottom: var(--border-thick) solid var(--color-line);
    box-shadow: 0 24px 40px rgba(0, 0, 0, .45);
  }

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

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

  .nav-link {
    display: block;
    padding: 12px 14px;
    font-size: var(--text-base);
    border-radius: var(--radius-sm);
  }

  .header-tools { order: 3; margin-left: auto; }
  .header-tools .view-switch { display: none; }

  .footer-top { flex-direction: column; gap: var(--space-4); }
  .footer-cols { gap: var(--space-4); }
}

@media (max-width: 640px) {
  :root { --gutter: 18px; }

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

  .section { padding-block: var(--space-6); }
  .section--lg { padding-block: var(--space-8); }

  .brand-mark { width: 30px; height: 30px; }
  .brand-name { font-size: var(--text-base); }

  .fav-btn { padding: 7px 12px; }
  .fav-btn-label { display: none; }
  .fav-btn::after { content: "收藏"; font-family: var(--font-mono); font-size: var(--text-xs); letter-spacing: .08em; }

  .footer-mega { letter-spacing: -0.02em; }
  .footer-meta { gap: var(--space-2); }
  .footer-cols { width: 100%; }
  .footer-col { flex: 1 1 40%; }
}

/* ============================================================
   Motion & contrast preferences
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .reveal { opacity: 1; transform: none; }
  .media-frame--tilt { transform: none; }
}

@media (prefers-contrast: more) {
  .card { border-color: var(--color-ink-muted); }
  .nav-link { color: var(--color-ink); }
}