/* ====================================================================
   Gracexiaoe · DTC Ads KB · style.css
   设计基调: 五行属水 — 玄墨 / 黛蓝 / 月白 / 海青
   反 AI slop 原则:
     - 衬线作标题 (IBM Plex Serif + Noto Serif SC)
     - 等宽作元数据/时间戳/标签 (IBM Plex Mono)
     - 主色就一个: 海蓝 #1a5490, 不搞渐变
     - 信息密度高,但留白有节奏
   ==================================================================== */

:root {
  /* 五行属水 ===================================================== */
  --bg:           #e8f1f6;      /* 月白 — 明显蓝灰水雾 */
  --bg-card:      #ffffff;      /* 素 */
  --bg-alt:       #d8e6ee;      /* 淡水 */
  --bg-deep:      #0a1f3a;      /* 玄 — 反向用 */
  --bg-tint:      #c8dde6;      /* 浅青 — hero / 装饰 */

  --ink:          #0a1f3a;      /* 玄墨 — primary text */
  --ink-soft:     #284763;      /* 黛蓝 */
  --ink-faint:    #5d7a8e;      /* 烟青 */
  --ink-quiet:    #8ba1b3;      /* 银灰 */

  --border:       #b3c8d5;      /* 银 */
  --border-soft:  #cadae3;
  --border-hair:  #dde7ee;

  --accent:       #1a8ca8;      /* 青碧 — TEAL, 真水色 */
  --accent-deep:  #0d6885;
  --accent-soft:  #c4dde6;
  --accent-glow:  rgba(26,140,168,0.12);

  --good:         #2d8a8a;      /* 海青 — 高相关 */
  --good-bg:      #c8e1e1;
  --warn:         #5d7a8e;      /* 烟青 — 中相关 */
  --warn-bg:      #d5dfe6;
  --quiet:        #8ba1b3;      /* 低相关 */
  --quiet-bg:     #dde7ee;

  --max-w:        1240px;
  --radius:       4px;
  --shadow-soft:  0 1px 0 rgba(10,31,58,0.04);
}

/* Reset + base ================================================ */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: 'IBM Plex Sans', 'Noto Sans SC', system-ui, -apple-system, 'PingFang SC', sans-serif;
  background: var(--bg);
  background-image:
    radial-gradient(ellipse 1200px 600px at 50% -200px, var(--accent-glow) 0%, transparent 70%),
    linear-gradient(180deg, var(--bg-tint) 0%, var(--bg) 400px);
  background-attachment: fixed;
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; transition: color 0.12s; }
a:hover { color: var(--accent-deep); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.wrap { max-width: var(--max-w); margin: 0 auto; padding: 0 28px; }

kbd {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 3px;
  background: var(--bg-card);
  color: var(--ink-soft);
}

/* Header ====================================================== */
.site-header {
  background: rgba(232,241,246,0.8);
  border-bottom: 1px solid var(--border-soft);
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 36px;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; color: var(--ink); }
.brand__seal {
  font-family: 'Noto Serif SC', serif;
  font-weight: 700;
  font-size: 19px;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--bg-deep) 0%, var(--accent-deep) 100%);
  color: #e8f1f6;
  border-radius: 3px;
  letter-spacing: 0;
  box-shadow: 0 1px 2px rgba(10,31,58,0.2);
}
.brand__wordmark {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
  gap: 2px;
}
.brand__name {
  font-family: 'IBM Plex Serif', serif;
  font-weight: 600;
  font-size: 17px;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.brand__sub {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.site-header nav {
  display: flex;
  gap: 22px;
  font-size: 14px;
  margin-left: 8px;
}
.site-header nav a {
  color: var(--ink-soft);
  padding: 4px 0;
  border-bottom: 2px solid transparent;
  font-weight: 500;
}
.site-header nav a:hover { color: var(--ink); text-decoration: none; }
.site-header nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.search-wrap {
  margin-left: auto;
  position: relative;
  display: flex;
  align-items: center;
}
#search-box {
  width: 320px;
  padding: 8px 36px 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  font-family: inherit;
  font-size: 13.5px;
  color: var(--ink);
  transition: border-color 0.12s, box-shadow 0.12s;
}
#search-box::placeholder { color: var(--ink-quiet); }
#search-box:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.search-wrap kbd {
  position: absolute;
  right: 10px;
  pointer-events: none;
}

/* Main ======================================================== */
main {
  min-height: calc(100vh - 64px - 88px);
  padding: 48px 28px 80px;
  max-width: var(--max-w);
  margin: 0 auto;
}
.loading {
  color: var(--ink-faint);
  text-align: center;
  padding: 100px 0;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  letter-spacing: 0.05em;
}

/* Headings ==================================================== */
h1, h2, h3 {
  font-family: 'Noto Serif SC', 'IBM Plex Serif', serif;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.25;
  margin: 0 0 14px;
  letter-spacing: -0.005em;
}
h1 { font-size: 38px; font-weight: 600; }
h2 {
  font-size: 22px;
  margin-top: 56px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-soft);
  font-weight: 600;
}
h2:first-child { margin-top: 0; }
h3 { font-size: 16.5px; font-weight: 600; }

.lede {
  font-size: 15.5px;
  color: var(--ink-soft);
  max-width: 760px;
  margin-bottom: 40px;
  line-height: 1.7;
}

/* Hero (homepage) ============================================ */
.hero {
  margin-bottom: 56px;
  padding: 36px 36px 40px;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(160deg, rgba(26,140,168,0.10) 0%, rgba(26,140,168,0) 60%),
    linear-gradient(180deg, var(--bg-card) 0%, rgba(255,255,255,0.6) 100%);
  border: 1px solid var(--border-soft);
  box-shadow: 0 1px 0 rgba(10,31,58,0.03);
}
.hero::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(26,140,168,0.10) 0%, transparent 65%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent 0%, var(--accent) 30%, var(--accent) 70%, transparent 100%);
  opacity: 0.35;
}
.hero > * { position: relative; z-index: 1; }
.hero__kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--accent);
  text-transform: uppercase;
  margin: 0 0 14px;
  font-weight: 500;
}
.hero__title {
  font-family: 'Noto Serif SC', serif;
  font-size: 52px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.015em;
  margin: 0 0 20px;
  color: var(--ink);
}
.hero__title em {
  font-style: italic;
  font-family: 'IBM Plex Serif', serif;
  font-weight: 500;
  color: var(--accent);
}
.hero__lede {
  font-family: 'IBM Plex Serif', 'Noto Serif SC', serif;
  font-size: 17.5px;
  line-height: 1.65;
  color: var(--ink-soft);
  max-width: 720px;
  margin: 0 0 32px;
  font-weight: 400;
}
.hero__lede strong { color: var(--ink); font-weight: 600; }

/* Hero CTA cluster ============================================ */
.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin: 0 0 22px;
}
.btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  padding: 11px 20px;
  border-radius: 4px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
  border: 1px solid transparent;
  text-decoration: none;
  letter-spacing: 0.01em;
  line-height: 1;
}
.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 1px 2px rgba(13,104,133,0.2);
}
.btn--primary:hover {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 3px 8px rgba(13,104,133,0.25);
}
.btn--ghost {
  background: var(--bg-card);
  color: var(--accent-deep);
  border-color: var(--accent);
}
.btn--ghost:hover {
  background: var(--accent-soft);
  color: var(--accent-deep);
  text-decoration: none;
}
.btn--text {
  background: transparent;
  color: var(--ink-soft);
  border-color: transparent;
  padding: 11px 8px;
}
.btn--text:hover {
  color: var(--accent);
  text-decoration: none;
}

/* Hero hint =================================================== */
.hero__hint {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  align-items: baseline;
  font-size: 13px;
  color: var(--ink-faint);
  margin: 0 0 28px;
  padding: 14px 18px;
  background: rgba(196,221,230,0.35);
  border-left: 2px solid var(--accent);
  border-radius: 0 4px 4px 0;
}
.hero__hint strong {
  color: var(--ink);
  font-weight: 600;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.hero__hint span { color: var(--ink-soft); }
.hero__hint a { color: var(--accent); font-weight: 500; }
.hero__stats {
  display: flex;
  gap: 48px;
  flex-wrap: wrap;
  align-items: baseline;
}
.stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat__num {
  font-family: 'IBM Plex Serif', serif;
  font-size: 36px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1;
  font-feature-settings: 'tnum' 1;
}
.stat__label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
  text-transform: uppercase;
}

/* Grid ======================================================== */
.grid {
  display: grid;
  gap: 18px;
}
.grid--topics  { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.grid--channels{ grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); }
.grid--takeaways { grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 960px) {
  .grid--takeaways { grid-template-columns: 1fr 1fr; }
}

/* Card (topic / channel) ====================================== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.15s ease, transform 0.15s ease, box-shadow 0.15s ease;
  position: relative;
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: transparent;
  transition: background 0.15s ease;
}
.card:hover {
  border-color: var(--accent);
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(13,31,58,0.06);
}
.card:hover::before { background: var(--accent); }
.card__kicker {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.card__title {
  font-family: 'Noto Serif SC', 'IBM Plex Serif', serif;
  font-size: 18px;
  font-weight: 600;
  color: var(--ink);
  line-height: 1.35;
}
.card__desc {
  color: var(--ink-soft);
  font-size: 13.5px;
  line-height: 1.55;
}
.card__meta {
  margin-top: auto;
  padding-top: 6px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-faint);
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}
.card__meta strong { color: var(--ink); font-weight: 600; font-size: 13px; }

/* Chip ======================================================== */
.chip-row { display: flex; gap: 6px; flex-wrap: wrap; }
.chip {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  padding: 3px 8px;
  border-radius: 3px;
  background: var(--bg-alt);
  color: var(--ink-soft);
  border: 1px solid var(--border-soft);
  white-space: nowrap;
  letter-spacing: 0.02em;
  transition: background 0.12s, color 0.12s;
}
a.chip:hover { background: var(--accent-soft); color: var(--accent); border-color: var(--accent-soft); text-decoration: none; }
.chip--accent { background: var(--accent-soft); color: var(--accent); border-color: transparent; font-weight: 500; }
.chip--platform-meta   { background: var(--accent-soft); color: var(--accent); border-color: transparent; }
.chip--platform-google { background: var(--good-bg); color: var(--good); border-color: transparent; }
.chip--rel-high   { background: var(--good-bg); color: var(--good); border-color: transparent; font-weight: 500; }
.chip--rel-medium { background: var(--warn-bg); color: var(--warn); border-color: transparent; }
.chip--rel-low    { background: var(--quiet-bg); color: var(--quiet); border-color: transparent; }
.chip--rel-none   { background: var(--bg-alt); color: var(--ink-quiet); border-color: transparent; opacity: 0.6; }

/* Takeaway card =============================================== */
.takeaway {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.takeaway:hover {
  border-color: var(--border);
  box-shadow: 0 2px 8px rgba(13,31,58,0.04);
}
.takeaway__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 14px;
}
.takeaway__channel {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.takeaway__channel a { color: var(--ink-soft); }
.takeaway__channel a:hover { color: var(--accent); }
.takeaway__time {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 10px;
  border-radius: 3px;
  white-space: nowrap;
  font-weight: 500;
  transition: background 0.12s;
}
.takeaway__time:hover { background: var(--accent); color: white; text-decoration: none; }
.takeaway__title {
  font-family: 'Noto Serif SC', 'IBM Plex Serif', serif;
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  margin: 0;
}
.takeaway__summary {
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.7;
  margin: 0;
}
.takeaway__amazon {
  background: linear-gradient(135deg, var(--accent-soft) 0%, rgba(196,221,230,0.4) 100%);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  padding: 12px 16px;
  margin: 0;
}
.takeaway__amazon-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--accent-deep);
  text-transform: uppercase;
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
}
.takeaway__amazon p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink);
  margin: 0;
  font-weight: 500;
}
.takeaway__quote-wrap {
  margin: 0;
}
.takeaway__quote-wrap summary {
  cursor: pointer;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-faint);
  padding: 4px 0;
  list-style: none;
  user-select: none;
  transition: color 0.12s;
}
.takeaway__quote-wrap summary::-webkit-details-marker { display: none; }
.takeaway__quote-wrap summary::before {
  content: '▸ ';
  display: inline-block;
  transition: transform 0.18s ease;
  color: var(--accent);
}
.takeaway__quote-wrap[open] summary::before { transform: rotate(90deg); }
.takeaway__quote-wrap summary:hover { color: var(--accent); }
.takeaway__quote-wrap .takeaway__quote {
  margin-top: 6px;
}
.takeaway__quote {
  border-left: 2px solid var(--accent);
  padding: 6px 14px 6px 16px;
  font-family: 'IBM Plex Serif', serif;
  font-style: italic;
  color: var(--ink-soft);
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
  background: linear-gradient(to right, var(--accent-soft) 0%, transparent 70%);
}

/* ==== 新版极简 takeaway: TLDR + Bullets + 折叠详情 ==== */
.takeaway__tldr {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  background: linear-gradient(135deg, rgba(26, 140, 168, 0.10) 0%, rgba(26, 140, 168, 0.03) 100%);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  margin: 0;
}
.takeaway__tldr-label {
  font-size: 16px;
  line-height: 1.4;
  flex-shrink: 0;
}
.takeaway__tldr p {
  margin: 0;
  font-family: 'Noto Serif SC', 'IBM Plex Serif', serif;
  font-size: 15px;
  line-height: 1.55;
  font-weight: 600;
  color: var(--ink);
}
.takeaway__bullets {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.takeaway__bullets li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-soft);
}
.takeaway__bullets li::before {
  content: '▸';
  position: absolute;
  left: 4px;
  top: 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 700;
}
.takeaway__detail-toggle {
  margin: 0;
  border-top: 1px dashed var(--border-hair);
  padding-top: 8px;
}
.takeaway__detail-toggle > summary {
  cursor: pointer;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--ink-quiet);
  list-style: none;
  user-select: none;
  padding: 2px 0;
  transition: color 0.12s;
}
.takeaway__detail-toggle > summary::-webkit-details-marker { display: none; }
.takeaway__detail-toggle > summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 6px;
  transition: transform 0.15s;
}
.takeaway__detail-toggle[open] > summary::before {
  transform: rotate(90deg);
}
.takeaway__detail-toggle > summary:hover { color: var(--accent); }
.takeaway__full-summary {
  margin: 8px 0 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--ink-faint);
  padding: 10px 14px;
  background: var(--bg-alt);
  border-radius: 4px;
}
.takeaway__detail-toggle .takeaway__quote {
  margin-top: 8px;
}
.takeaway__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed var(--border-soft);
}

/* Filter bar ================================================== */
.filter-bar {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
  padding: 14px 18px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  font-size: 13px;
  flex-wrap: wrap;
}
.filter-bar label {
  color: var(--ink-soft);
  font-weight: 500;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.filter-bar select {
  font-family: inherit;
  font-size: 13px;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: var(--bg-card);
  color: var(--ink);
  cursor: pointer;
}
.filter-bar select:focus {
  outline: none;
  border-color: var(--accent);
}
.filter-bar > span {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--ink-faint);
  margin-left: auto;
}

/* Channel detail ============================================== */
.channel-hero {
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--accent-soft) 100%);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  padding: 32px 36px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}
.channel-hero h1 { margin-bottom: 8px; font-size: 32px; }
.channel-hero__handle {
  font-family: 'IBM Plex Mono', monospace;
  color: var(--ink-faint);
  font-size: 13px;
  letter-spacing: 0.04em;
}
.channel-hero__row {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
  margin-top: 18px;
  font-size: 13.5px;
  color: var(--ink-soft);
  font-family: 'IBM Plex Mono', monospace;
}
.channel-hero__row strong { color: var(--ink); font-weight: 600; }

/* Video detail ================================================ */
.video-frame {
  width: 100%;
  aspect-ratio: 16/9;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-deep);
}
.video-detail-grid {
  display: grid;
  gap: 36px;
  grid-template-columns: minmax(0, 1fr);
}
@media (min-width: 1100px) {
  .video-detail-grid { grid-template-columns: minmax(0, 2fr) minmax(340px, 1fr); }
}

/* Search results ============================================== */
.search-result-item {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  padding: 16px 20px;
  border-radius: var(--radius);
  margin-bottom: 12px;
  transition: border-color 0.12s;
}
.search-result-item:hover { border-color: var(--accent); }
.search-result-item mark {
  background: var(--accent-soft);
  color: var(--accent);
  padding: 0 3px;
  border-radius: 2px;
  font-weight: 500;
}

/* Footer ====================================================== */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 28px 0;
  background: var(--bg-card);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-faint);
  letter-spacing: 0.03em;
}
.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}
.foot-brand { color: var(--ink-soft); font-weight: 500; }
.foot-stack { color: var(--ink-quiet); }

/* Playbook (long-form markdown article) ====================== */
.playbook {
  max-width: 760px;
  margin: 16px auto 40px;
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-radius: 6px;
  padding: 56px 64px 64px;
  box-shadow: 0 1px 0 rgba(10,31,58,0.04);
}
.playbook h1 {
  font-family: 'Noto Serif SC', 'IBM Plex Serif', serif;
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.playbook h1 + blockquote {
  border-left: 2px solid var(--accent);
  background: linear-gradient(to right, var(--accent-soft) 0%, transparent 80%);
  margin: 18px 0 36px;
  padding: 14px 20px;
  font-family: 'IBM Plex Serif', serif;
  color: var(--ink-soft);
  font-style: normal;
  font-size: 14.5px;
  line-height: 1.7;
}
.playbook h1 + blockquote p { margin: 4px 0; }
.playbook h2 {
  font-size: 26px;
  font-weight: 600;
  margin: 56px 0 18px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-soft);
  letter-spacing: -0.005em;
}
.playbook h3 {
  font-size: 19px;
  font-weight: 600;
  margin: 32px 0 12px;
  color: var(--ink);
  line-height: 1.4;
}
.playbook p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  margin: 12px 0;
}
.playbook strong { color: var(--ink); font-weight: 600; }
.playbook em { font-style: italic; color: var(--accent-deep); }
.playbook blockquote {
  border-left: 3px solid var(--accent);
  background: var(--accent-soft);
  padding: 14px 18px;
  margin: 18px 0;
  font-family: 'IBM Plex Serif', serif;
  font-style: italic;
  color: var(--ink-soft);
  font-size: 14.5px;
  line-height: 1.7;
  border-radius: 0 4px 4px 0;
}
.playbook blockquote p { margin: 0; }
.playbook ul, .playbook ol {
  padding-left: 24px;
  line-height: 1.8;
}
.playbook ul li, .playbook ol li { margin: 6px 0; }
.playbook code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  background: var(--bg-alt);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--ink-soft);
}
.playbook table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
}
.playbook table th {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-faint);
  text-align: left;
  padding: 10px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--bg-alt);
}
.playbook table td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--border-hair);
  color: var(--ink);
}
.playbook table td:first-child { color: var(--accent-deep); font-weight: 500; }
.playbook hr {
  border: none;
  border-top: 1px dashed var(--border);
  margin: 40px 0;
}
.playbook a { color: var(--accent); }
.playbook__foot {
  max-width: 760px;
  margin: 0 auto 60px;
  padding: 24px 0 0;
  text-align: center;
  border-top: 1px dashed var(--border-soft);
}
.playbook__foot p {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin: 0 0 14px;
}
.playbook__foot .hero__cta { justify-content: center; margin: 0; }

@media (max-width: 760px) {
  .playbook { padding: 32px 22px; border-radius: 4px; }
  .playbook h1 { font-size: 28px; }
  .playbook h2 { font-size: 22px; }
  .playbook h3 { font-size: 17px; }
}

/* Empty state ================================================= */
.empty {
  text-align: center;
  padding: 80px 24px;
  color: var(--ink-faint);
  font-size: 14px;
}
.empty h2 {
  border-bottom: none;
  font-size: 22px;
  margin-bottom: 12px;
}
.empty a { color: var(--accent); }
.empty code {
  font-family: 'IBM Plex Mono', monospace;
  background: var(--bg-alt);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 12.5px;
  color: var(--ink-soft);
}

/* Section under takeaway list ================================ */
section[data-channel] {
  margin-bottom: 48px;
}
section[data-channel] > h2 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  margin-top: 0;
  margin-bottom: 18px;
  border-bottom: 1px solid var(--border-soft);
  padding-bottom: 10px;
}

/* Responsive small ============================================ */
@media (max-width: 720px) {
  .site-header .wrap { gap: 14px; height: auto; padding: 12px 16px; flex-wrap: wrap; }
  .site-header nav { gap: 14px; }
  #search-box { width: 100%; }
  .search-wrap { width: 100%; order: 99; }
  .hero__title { font-size: 36px; }
  .hero__stats { gap: 28px; }
  .stat__num { font-size: 28px; }
  main { padding: 32px 18px 60px; }
  h1 { font-size: 28px; }
  .takeaway { padding: 18px; }
}

/* ============================================================
   Grace 小助手 widget (assistant.js)
   ============================================================ */
.assistant-fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px 12px 14px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-deep) 100%);
  color: #fff;
  border: none;
  border-radius: 999px;
  cursor: pointer;
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
  box-shadow: 0 4px 14px rgba(13,104,133,0.35), 0 2px 4px rgba(13,104,133,0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  animation: assistantPulse 3s ease-in-out infinite;
}
.assistant-fab:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 22px rgba(13,104,133,0.45), 0 3px 6px rgba(13,104,133,0.25);
}
.assistant-fab.is-hidden {
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
}
.assistant-fab__drop {
  font-size: 20px;
  line-height: 1;
  display: inline-block;
  animation: assistantDrop 2s ease-in-out infinite;
}
.assistant-fab__label { line-height: 1; }
@keyframes assistantPulse {
  0%, 100% { box-shadow: 0 4px 14px rgba(13,104,133,0.35), 0 2px 4px rgba(13,104,133,0.2); }
  50%      { box-shadow: 0 4px 14px rgba(13,104,133,0.35), 0 0 0 6px rgba(26,140,168,0.15); }
}
@keyframes assistantDrop {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-2px); }
}

.assistant-panel {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 101;
  width: 420px;
  max-width: calc(100vw - 32px);
  max-height: calc(100vh - 48px);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 16px 48px rgba(10,31,58,0.18), 0 4px 12px rgba(10,31,58,0.08);
  display: flex;
  flex-direction: column;
  opacity: 0;
  transform: translateY(20px) scale(0.96);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
  overflow: hidden;
}
.assistant-panel.is-open {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: auto;
}
.assistant-panel__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  padding: 16px 18px 14px;
  background: linear-gradient(135deg, var(--bg-tint) 0%, var(--bg-card) 100%);
  border-bottom: 1px solid var(--border-soft);
}
.assistant-panel__title {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
}
.assistant-panel__title strong {
  font-family: 'Noto Serif SC', 'IBM Plex Serif', serif;
  font-size: 16px;
  color: var(--ink);
  display: block;
  line-height: 1.2;
}
.assistant-panel__sub {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  display: block;
  margin-top: 2px;
}
.assistant-panel__close {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  color: var(--ink-faint);
  padding: 4px 8px;
  border-radius: 4px;
  line-height: 1;
}
.assistant-panel__close:hover {
  background: var(--bg-alt);
  color: var(--ink);
}

.assistant-panel__input {
  display: flex;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-soft);
  background: var(--bg-card);
}
.assistant-panel__input input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-family: inherit;
  font-size: 14px;
  color: var(--ink);
  background: var(--bg-card);
  transition: border-color 0.12s, box-shadow 0.12s;
}
.assistant-panel__input input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.assistant-panel__input button {
  padding: 10px 14px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
}
.assistant-panel__input button:hover { background: var(--accent-deep); border-color: var(--accent-deep); }

.assistant-panel__samples,
.assistant-panel__results {
  flex: 1;
  overflow-y: auto;
  padding: 16px 18px 20px;
}
.assistant-panel__sample-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin: 0 0 10px;
}
.assistant-sample {
  display: inline-block;
  background: var(--bg-alt);
  border: 1px solid var(--border-soft);
  color: var(--ink-soft);
  padding: 7px 12px;
  border-radius: 999px;
  font-family: inherit;
  font-size: 13px;
  margin: 0 6px 8px 0;
  cursor: pointer;
  transition: all 0.12s;
}
.assistant-sample:hover {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-deep);
}

.assistant-panel__manifesto {
  margin: 22px 0 0;
  padding: 12px 14px;
  background: rgba(196,221,230,0.4);
  border-left: 2px solid var(--accent);
  border-radius: 0 4px 4px 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--ink-soft);
}
.assistant-panel__manifesto strong { color: var(--ink); }
.assistant-panel__manifesto u { text-decoration: underline; text-decoration-color: var(--accent); }
.assistant-panel__manifesto-note {
  display: block;
  margin-top: 6px;
  font-style: italic;
  color: var(--ink-faint);
  font-size: 12px;
}

.assistant-loading,
.assistant-empty {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 13px;
  color: var(--ink-faint);
  text-align: center;
  padding: 30px 10px;
  line-height: 1.7;
}
.assistant-empty em { color: var(--accent-deep); font-style: normal; font-family: inherit; }

.assistant-results__head {
  font-size: 13px;
  color: var(--ink-soft);
  margin-bottom: 12px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border-soft);
}
.assistant-results__head strong { color: var(--accent-deep); font-size: 16px; }
.assistant-results__hint {
  display: block;
  margin-top: 4px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-faint);
}

.assistant-cards { display: flex; flex-direction: column; gap: 10px; }
.assistant-card {
  background: var(--bg-card);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 12px 14px;
  transition: border-color 0.12s, box-shadow 0.12s;
}
.assistant-card:hover {
  border-color: var(--accent);
  box-shadow: 0 2px 8px rgba(13,104,133,0.08);
}
.assistant-card__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  flex-wrap: wrap;
}
.assistant-card__num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  width: 20px;
  height: 20px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 3px;
}
.assistant-card__channel {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
  flex: 1;
}
.assistant-card__time {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 3px 8px;
  border-radius: 3px;
  font-weight: 500;
}
.assistant-card__time:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}
.assistant-card__title {
  font-family: 'Noto Serif SC', 'IBM Plex Serif', serif;
  font-size: 14.5px;
  font-weight: 600;
  margin: 4px 0 6px;
  line-height: 1.4;
  color: var(--ink);
}
.assistant-card__hint {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0;
}

/* ---- 官方动态 mini 卡(混排在小助手结果里) ---- */
.assistant-card--official {
  border-left: 3px solid var(--accent);
  background: linear-gradient(0deg, rgba(196, 221, 230, 0.08), transparent 30%);
}
.assistant-card--official.is-stale {
  border-left-color: #b8b8b8;
  opacity: 0.88;
}
.assistant-card__source-tag {
  display: inline-block;
  padding: 1px 6px;
  background: var(--accent);
  color: #fff;
  border-radius: 3px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10px;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.assistant-card--official.is-stale .assistant-card__source-tag {
  background: #999;
}
.assistant-card__foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 8px;
  padding-top: 8px;
  border-top: 1px dashed var(--border);
  font-size: 11px;
  font-family: 'IBM Plex Mono', monospace;
}
.assistant-card__amazon-mark {
  color: var(--accent-deep);
  font-weight: 500;
}
.assistant-card__verified {
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}
.assistant-card__verified.is-stale {
  color: #b8512c;
  font-weight: 500;
}
.assistant-results__mix {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-soft);
  margin-left: 6px;
  letter-spacing: 0.02em;
}

/* ---- 诚实标签:confidence + platform + weak-warn ---- */
.assistant-conf {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  margin-left: 6px;
  border-radius: 3px;
  vertical-align: middle;
  font-weight: 500;
}
.assistant-conf--medium {
  color: #8a5a00;
  background: #fff4d6;
  border: 1px solid #f0d68a;
}
.assistant-conf--weak {
  color: #8a3a00;
  background: #ffe8d6;
  border: 1px solid #f0b88a;
}
.assistant-platform-tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  padding: 2px 7px;
  margin-left: 6px;
  border-radius: 3px;
  vertical-align: middle;
  background: var(--accent-soft);
  color: var(--accent-deep);
  border: 1px solid var(--border-soft);
  font-weight: 500;
}
.assistant-weak-warn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  line-height: 1.65;
  color: #8a3a00;
  background: #fff4ec;
  border: 1px solid #f0b88a;
  border-left: 3px solid #c05a1a;
  border-radius: 4px;
  padding: 9px 12px;
  margin: 0 0 12px;
}

/* ---- AI 答案块 (Phase 2) ---- */
.assistant-answer {
  display: block;
}
.assistant-answer__head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border-soft);
  flex-wrap: wrap;
}
.assistant-answer__badge {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  background: linear-gradient(180deg, var(--accent), var(--accent-deep));
  color: #fff;
  border-radius: 3px;
}
.assistant-answer__meta {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  color: var(--ink-faint);
  margin-left: auto;
}
.assistant-answer__block {
  margin: 0 0 14px;
  padding: 12px 14px;
  background: var(--bg-card);
  border-left: 3px solid var(--accent-soft);
  border-radius: 0 4px 4px 0;
}
.assistant-answer__block--amazon {
  border-left-color: var(--accent);
  background: linear-gradient(0deg, #f4fafc 0%, #ffffff 100%);
}
.assistant-answer__label {
  margin: 0 0 6px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-deep);
}
.assistant-answer__body {
  margin: 0;
  font-family: 'IBM Plex Serif', 'Noto Serif SC', serif;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink);
}
.assistant-answer__cites {
  margin-top: 14px;
}
.assistant-answer__cites-label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  margin: 0 0 8px;
}
.assistant-answer__more {
  margin-top: 14px;
  border-top: 1px dashed var(--border-soft);
  padding-top: 10px;
}
.assistant-answer__more summary {
  cursor: pointer;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-soft);
  padding: 6px 0;
  list-style: none;
  user-select: none;
}
.assistant-answer__more summary::-webkit-details-marker { display: none; }
.assistant-answer__more summary:hover { color: var(--accent-deep); }
.assistant-answer__more[open] summary { color: var(--accent-deep); margin-bottom: 8px; }

.assistant-fallback-warn {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  line-height: 1.65;
  color: #6a4400;
  background: #fffbe6;
  border: 1px solid #f0d68a;
  border-left: 3px solid #c08a1a;
  border-radius: 4px;
  padding: 10px 12px;
  margin: 0 0 12px;
}
.assistant-fallback-warn code {
  background: rgba(0,0,0,0.06);
  padding: 1px 5px;
  border-radius: 2px;
  font-size: 11px;
}

.assistant-recommend {
  margin-top: 18px;
  padding: 14px;
  background: var(--accent-soft);
  border-radius: 6px;
  text-align: center;
}
.assistant-recommend__label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--accent-deep);
  text-transform: uppercase;
  margin: 0 0 8px;
}

.assistant-back {
  display: block;
  margin: 16px auto 0;
  padding: 8px 16px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--ink-soft);
  font-family: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition: all 0.12s;
}
.assistant-back:hover { background: var(--bg-alt); color: var(--ink); border-color: var(--ink-faint); }

@media (max-width: 480px) {
  .assistant-fab { right: 14px; bottom: 14px; padding: 10px 14px 10px 12px; font-size: 13px; }
  .assistant-fab__label { display: none; }
  .assistant-panel { right: 8px; bottom: 8px; left: 8px; max-width: none; width: auto; max-height: calc(100vh - 16px); }
}

/* ============================================
   #/updates 官方动态页 — 中性 source 标签 + verified_on stale 提示
   遵循 challenger 反馈: 不打颜色分,只显示元数据,把信任责任还给用户
   ============================================ */

.page--updates {
  max-width: 920px;
  margin: 0 auto;
  padding: 32px 20px 60px;
}

.page--updates .page__head {
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.page--updates .page__kicker {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.page--updates h1 {
  font-family: 'IBM Plex Serif', 'Noto Serif SC', serif;
  font-size: 30px;
  font-weight: 600;
  margin: 0 0 12px;
  color: var(--ink);
}
.page__count {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 16px;
  font-weight: 400;
  color: var(--ink-faint);
}
.page__manifesto {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-soft);
  margin: 12px 0 0;
  padding: 14px 16px;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
}
.page__manifesto strong { color: var(--ink); }
.page__manifesto u { text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 3px; color: var(--accent-deep); }

/* 过滤按钮组 */
.updates-filter {
  display: flex;
  gap: 6px;
  margin-bottom: 20px;
  flex-wrap: wrap;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.updates-filter__btn {
  padding: 6px 12px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--ink-soft);
  font-family: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition: all 0.12s;
}
.updates-filter__btn:hover { background: white; color: var(--ink); border-color: var(--ink-faint); }
.updates-filter__btn.is-active {
  background: var(--accent);
  color: white;
  border-color: var(--accent-deep);
  font-weight: 500;
}

.updates-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* official-card 官方更新卡片 */
.official-card {
  background: white;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 18px 20px;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.official-card:hover { box-shadow: 0 2px 8px rgba(10, 31, 58, 0.06); }
.official-card.is-stale { border-left-color: var(--ink-quiet); opacity: 0.92; }

.official-card__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.official-card__source {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--ink-soft);
}
.official-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.05em;
  border-radius: 3px;
}
.official-card__publisher {
  color: var(--ink-faint);
  font-style: italic;
}
.official-card__impact {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11px;
  letter-spacing: 0.04em;
  padding: 2px 6px;
  border-radius: 3px;
  border: 1px solid var(--border);
  color: var(--ink-soft);
}
.official-card__impact--high { color: var(--ink); border-color: var(--ink-faint); font-weight: 600; }
.official-card__impact--medium { color: var(--ink-soft); }
.official-card__impact--low { color: var(--ink-quiet); }

.official-card__title {
  font-family: 'IBM Plex Serif', 'Noto Serif SC', serif;
  font-size: 17.5px;
  font-weight: 600;
  line-height: 1.4;
  margin: 4px 0 10px;
  color: var(--ink);
}
.official-card__summary {
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-soft);
  margin: 0 0 14px;
}

.official-card__amazon {
  background: var(--bg-alt);
  padding: 12px 14px;
  border-radius: 4px;
  margin-bottom: 14px;
  border-left: 2px solid var(--ink-quiet);
}
.official-card__amazon.is-actionable {
  background: linear-gradient(180deg, rgba(26,140,168,0.08) 0%, rgba(26,140,168,0.03) 100%);
  border-left-color: var(--accent);
}
.official-card__amazon-label {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  margin-bottom: 4px;
}
.official-card__amazon.is-actionable .official-card__amazon-label { color: var(--accent-deep); }
.official-card__amazon p {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink);
}

.official-card__foot {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.official-card__dates {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-quiet);
}
.verified-tag { color: var(--ink-faint); }
.verified-tag--stale {
  color: #b8512c;
  font-weight: 500;
}
.stale-warning {
  background: #fff3eb;
  border: 1px solid #f0c4a8;
  border-radius: 3px;
  padding: 8px 12px;
  font-size: 12.5px;
  color: #8c4423;
}
.stale-warning a { color: #b8512c; font-weight: 500; }
.stale-warning a:hover { color: #8c4423; }

.official-card__link {
  display: inline-block;
  font-size: 12.5px;
  font-family: 'IBM Plex Mono', monospace;
  color: var(--accent-deep);
  border-bottom: 1px solid transparent;
  align-self: flex-start;
  transition: border-color 0.12s;
}
.official-card__link:hover {
  text-decoration: none;
  border-bottom-color: var(--accent-deep);
}

@media (max-width: 480px) {
  .page--updates { padding: 20px 14px 40px; }
  .page--updates h1 { font-size: 24px; }
  .official-card { padding: 14px 16px; }
  .official-card__title { font-size: 16px; }
}

/* ============================================================
   小助手 · AI 答案新格式 (tldr + bullets + amazon_tip)
   ============================================================ */
.assistant-answer__tldr {
  font-family: 'Noto Serif SC', Georgia, serif;
  font-size: 16px;
  line-height: 1.55;
  font-weight: 600;
  color: var(--ink);
  margin: 12px 0 10px;
  padding: 12px 14px;
  background: linear-gradient(180deg, var(--bg-tint) 0%, var(--bg-alt) 100%);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
}
.assistant-answer__bullets {
  list-style: none;
  padding: 0;
  margin: 10px 0 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.assistant-answer__bullets li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--ink-soft);
}
.assistant-answer__bullets li::before {
  content: '▸';
  position: absolute;
  left: 2px;
  top: 0;
  color: var(--accent);
  font-weight: 700;
}
.assistant-answer__amazon {
  margin: 10px 0 6px;
  padding: 8px 12px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg-card);
  border: 1px solid var(--accent-soft);
  border-radius: 2px;
}
.assistant-answer__followup {
  display: inline-block;
  margin: 10px 0 4px;
  font-size: 12.5px;
  color: var(--accent-deep);
  border-bottom: 1px dashed var(--accent-soft);
  padding-bottom: 1px;
}
.assistant-answer__followup:hover {
  text-decoration: none;
  border-bottom-color: var(--accent-deep);
}
.assistant-answer__foot {
  margin: 12px 0 6px;
  font-size: 11px;
  line-height: 1.5;
  color: var(--ink-quiet);
}
.assistant-answer__cites > summary,
.assistant-answer__more > summary {
  cursor: pointer;
  font-size: 12px;
  color: var(--ink-faint);
  padding: 4px 0;
  list-style: none;
  border-top: 1px dashed rgba(10,31,58,0.1);
  margin-top: 8px;
  padding-top: 8px;
}
.assistant-answer__cites > summary::-webkit-details-marker,
.assistant-answer__more > summary::-webkit-details-marker { display: none; }
.assistant-answer__cites > summary:hover,
.assistant-answer__more > summary:hover { color: var(--accent); }

/* ============================================================
   编辑杂志感 · 覆盖层
   参考: Linear (无 chrome / typography-first), Aaino (Serif 有性格),
        marginalia encyclopedia (印刷原则), Stripe (一致文章形状)
   策略: 用字号字重做层级替代色块;radius 收紧;chip 去彩色背景
   ============================================================ */

/* 大标题:更 editorial */
.hero__title {
  font-family: 'Noto Serif SC', Georgia, serif;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.hero__kicker {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--ink-quiet);
}
.hero__lede {
  font-size: 15px;
  line-height: 1.75;
  max-width: 62ch;
}

/* stat 数字改 Serif 拉大,更编辑杂志 */
.stat__num {
  font-family: 'Noto Serif SC', Georgia, serif;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.stat__label {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-quiet);
}

/* 卡片:radius 收紧、shadow 更微、hover 用 border 说话 */
.card,
.takeaway,
.official-card {
  border-radius: 2px;
  box-shadow: none;
  transition: border-color 0.15s, transform 0.15s;
}
.card:hover,
.takeaway:hover,
.official-card:hover {
  box-shadow: none;
  border-color: var(--ink-soft);
  transform: none;
}

/* chip:去彩色背景,只留 border(monospace 感)
   注意:保留 platform-* 的左侧色条(信息区分),保留 rel-* 的分层
*/
.chip {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10.5px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: 2px;
  padding: 3px 8px;
  background: transparent;
  border: 1px solid rgba(10,31,58,0.15);
  color: var(--ink-soft);
  font-weight: 500;
  position: relative;
}
/* accent / rel-high 变强调 */
.chip--accent,
.chip--rel-high {
  background: transparent;
  border-color: var(--accent);
  color: var(--accent-deep);
  font-weight: 600;
}
/* rel-medium / rel-low 用透明度分层保留信息 */
.chip--rel-medium {
  background: transparent;
  border-color: rgba(10,31,58,0.25);
  color: var(--ink-soft);
}
.chip--rel-low {
  background: transparent;
  border-color: rgba(10,31,58,0.1);
  color: var(--ink-quiet);
  opacity: 0.7;
}
/* platform-* 保留左侧 3px 色条,一眼分平台 */
.chip--platform-google,
.chip--platform-meta,
.chip--platform-amazon {
  background: transparent;
  border-color: rgba(10,31,58,0.15);
  color: var(--ink-soft);
}
.chip[class*="platform-"]::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 3px;
  border-radius: 2px 0 0 2px;
}
.chip--platform-google::before  { background: #4285F4; }
.chip--platform-meta::before    { background: #1877F2; }
.chip--platform-amazon::before  { background: #FF9900; }
.chip[class*="platform-"] { padding-left: 10px; }

/* takeaway 标题也换 Serif,拉字重 */
.takeaway__title {
  font-family: 'Noto Serif SC', Georgia, serif;
  font-weight: 600;
  letter-spacing: -0.005em;
  line-height: 1.4;
}

/* topic / channel 卡片标题同步 */
.card__title {
  font-family: 'Noto Serif SC', Georgia, serif;
  font-weight: 600;
  letter-spacing: -0.005em;
}
.card__kicker {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-quiet);
}

/* 按钮 radius 收紧 + 更细边框 */
.btn {
  border-radius: 2px;
  font-weight: 500;
  letter-spacing: 0.01em;
}
.btn--ghost {
  border-width: 1px;
}

/* 顶部导航更 quiet */
.site-header nav a {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 500;
}

/* 全站正文行距略拉,更好读 */
body {
  line-height: 1.65;
}

/* 分隔线更细 */
hr {
  border: none;
  border-top: 1px solid rgba(10,31,58,0.08);
  margin: 32px 0;
}

/* fab 更精致 */
.assistant-fab {
  border-radius: 999px;
  box-shadow: 0 2px 12px rgba(10,31,58,0.15);
}
.assistant-fab__label {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* =====================================================
 * Freshness / 迭代感 元数据(hero 底部 + 更新记录折叠)
 * ===================================================== */
.hero__meta {
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid rgba(10,31,58,0.08);
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  align-items: baseline;
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--ink-quiet);
}
.hero__meta-item {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
}
.hero__meta-item strong {
  color: var(--ink-soft);
  font-weight: 600;
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  letter-spacing: 0;
}
/* 数据新鲜度小标签: fresh=淡绿 / stale=红,normal 完全不渲染 */
.hero__freshness {
  margin-left: 8px;
  padding: 1px 6px;
  border-radius: 3px;
  font-size: 10.5px;
  letter-spacing: 0.02em;
  font-weight: 600;
  white-space: nowrap;
}
.hero__freshness--fresh {
  color: #14663a;
  background: rgba(20,102,58,0.09);
}
.hero__freshness--stale {
  color: #a5221a;
  background: rgba(165,34,26,0.09);
}
.hero__changelog {
  flex: 1 1 100%;
  margin-top: 4px;
}
.hero__changelog > summary {
  cursor: pointer;
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid rgba(10,31,58,0.15);
  border-radius: 2px;
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-quiet);
  transition: border-color 0.15s, color 0.15s;
  list-style: none;
}
.hero__changelog > summary::-webkit-details-marker { display: none; }
.hero__changelog > summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 6px;
  transition: transform 0.2s;
  font-size: 10px;
}
.hero__changelog[open] > summary::before {
  transform: rotate(90deg);
}
.hero__changelog > summary:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.hero__changelog ul {
  list-style: none;
  padding: 0;
  margin: 14px 0 8px;
  font-family: 'Noto Sans SC', 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 13.5px;
  line-height: 1.7;
  letter-spacing: 0;
  color: var(--ink-soft);
  text-transform: none;
}
.hero__changelog ul li {
  padding: 6px 0;
  border-left: 2px solid var(--accent-soft, rgba(26,140,168,0.35));
  padding-left: 12px;
}
.hero__changelog ul li strong {
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-weight: 600;
  color: var(--accent);
  margin-right: 8px;
  font-size: 12.5px;
}
.hero__changelog-note {
  margin: 8px 0 0;
  padding: 10px 12px;
  background: var(--bg-tint, rgba(26,140,168,0.05));
  border-radius: 2px;
  font-family: 'Noto Sans SC', 'IBM Plex Sans', system-ui, sans-serif;
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0;
  color: var(--ink-soft);
  text-transform: none;
}

/* 首页 "官方动态·近期核对" grid: 单列或双列(减少视觉干扰) */
.grid--officials-home {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 16px 0 8px;
}
@media (min-width: 900px) {
  .grid--officials-home {
    grid-template-columns: 1fr 1fr;
  }
}

/* "看全部" 尾链接 */
.see-all {
  margin: 8px 0 32px;
  text-align: right;
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 12px;
  letter-spacing: 0.05em;
}
.see-all a {
  color: var(--accent);
  border-bottom: 1px dashed var(--accent-soft, rgba(26,140,168,0.4));
  padding-bottom: 1px;
}
.see-all a:hover {
  border-bottom-style: solid;
}

/* h2 旁边的 tooltip 问号 */
.h2__note {
  display: inline-block;
  width: 16px;
  height: 16px;
  line-height: 15px;
  text-align: center;
  border: 1px solid rgba(10,31,58,0.2);
  border-radius: 50%;
  font-family: 'IBM Plex Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10px;
  font-weight: 500;
  color: var(--ink-quiet);
  cursor: help;
  margin-left: 6px;
  vertical-align: middle;
}

/* 段落 lede 紧凑变体 */
.lede--tight {
  margin-top: -8px;
  margin-bottom: 16px;
  font-size: 13.5px;
  color: var(--ink-soft);
}