* {
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --panel: #fbfbfb;
  --ink: #171717;
  --muted: #6f6f6f;
  --soft: #f4f4f5;
  --line: #e8e8ea;
  --blue: #2563eb;
  --blue-soft: #eff6ff;
  --green: #16a34a;
  --wechat: #07c160;
  --radius: 18px;
  --sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "SFMono-Regular", "Roboto Mono", Consolas, monospace;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.wiki-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  min-height: 100vh;
  background: var(--bg);
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  min-height: 100vh;
  padding: 28px 20px;
  border-right: 1px solid var(--line);
  background: #fafafa;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px 24px;
  border-bottom: 1px solid var(--line);
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  color: #fff;
  background: var(--ink);
  font-size: 18px;
  font-weight: 800;
}

.brand strong {
  display: block;
  font-size: 16px;
  line-height: 1.2;
}

.brand span:not(.brand-mark) {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.nav-group {
  margin-top: 24px;
}

.nav-title {
  margin: 0 0 10px;
  padding: 0 8px;
  color: #9a9a9a;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.nav-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  min-height: 38px;
  padding: 0 10px;
  border-radius: 10px;
  color: #404040;
  font-size: 14px;
}

.nav-item.active,
.nav-item:hover {
  color: var(--blue);
  background: var(--blue-soft);
  font-weight: 700;
}

.nav-item.locked {
  color: #71717a;
}

.nav-item.locked small {
  color: #a16207;
}

.nav-item small {
  color: #a1a1aa;
  font-family: var(--mono);
  font-size: 11px;
}

.sidebar-foot {
  margin-top: 30px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.sidebar-foot b {
  display: block;
  font-size: 13px;
}

.sidebar-foot p {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.main {
  min-width: 0;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 20px;
  min-height: 72px;
  padding: 0 42px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, .9);
  backdrop-filter: blur(12px);
}

.search {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 520px;
  height: 42px;
  padding: 0 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: #9a9a9a;
  background: #fafafa;
  font-size: 14px;
}

.search kbd {
  margin-left: auto;
  padding: 3px 7px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: #8a8a8a;
  background: #fff;
  font-family: var(--mono);
  font-size: 11px;
}

.top-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--muted);
  font-size: 13px;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 34px;
  padding: 0 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
}

.dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
}

.pill.private .dot {
  background: var(--wechat);
}

.content {
  max-width: 1180px;
  padding: 56px 64px 76px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 52px;
  align-items: end;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 30px;
  padding: 0 11px;
  border-radius: 999px;
  color: var(--blue);
  background: var(--blue-soft);
  font-size: 13px;
  font-weight: 700;
}

h1 {
  max-width: 760px;
  margin: 22px 0 0;
  font-size: clamp(40px, 5vw, 58px);
  line-height: 1.08;
  letter-spacing: -.04em;
}

.lead {
  max-width: 690px;
  margin: 22px 0 0;
  color: #4b5563;
  font-size: 18px;
  line-height: 1.85;
}

.hero-card,
.chapter,
.preview-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
}

.hero-card {
  padding: 24px;
  background:
    radial-gradient(circle at 90% 8%, rgba(37, 99, 235, .12), transparent 44%),
    #fff;
  box-shadow: 0 16px 40px rgba(17, 24, 39, .06);
}

.hero-card small,
.preview-card small {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.hero-card strong {
  display: block;
  margin-top: 14px;
  font-size: 24px;
  line-height: 1.35;
}

.hero-card p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.stat {
  padding: 14px;
  border-radius: 14px;
  background: var(--soft);
}

.stat b {
  display: block;
  font-size: 22px;
}

.stat span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-size: 12px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-top: 58px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.section-head h2 {
  margin: 0;
  font-size: 28px;
  letter-spacing: -.02em;
}

.section-head p {
  max-width: 520px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.updated {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
}

.chapter-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.chapter-grid.handbook-two-col {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.chapter-grid.handbook-two-col .chapter {
  min-height: 310px;
}

.chapter {
  min-height: 220px;
  padding: 22px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}

.chapter:hover {
  transform: translateY(-3px);
  border-color: #c7d2fe;
  box-shadow: 0 14px 34px rgba(37, 99, 235, .08);
}

.chapter-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.num {
  color: var(--blue);
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 800;
}

.tag {
  height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  color: #52525b;
  background: var(--soft);
  font-size: 12px;
  line-height: 24px;
}

.chapter h3 {
  margin: 30px 0 0;
  font-size: 24px;
  letter-spacing: -.025em;
}

.chapter p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.65;
}

.links {
  display: grid;
  gap: 8px;
  margin-top: 18px;
}

.links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  color: #3f3f46;
  font-size: 13px;
}

.links a::before {
  content: "→";
  margin-right: 8px;
  color: var(--blue);
}

.links a em {
  flex: 0 0 auto;
  font-style: normal;
  color: #a16207;
  font-size: 12px;
}

.auth-content {
  max-width: 1120px;
}

.auth-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 52px;
  align-items: center;
  min-height: calc(100vh - 220px);
}

.private-eyebrow {
  color: #047857;
  background: #ecfdf5;
}

.login-card {
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 24px;
  background:
    radial-gradient(circle at 90% 0%, rgba(7, 193, 96, .12), transparent 42%),
    #fff;
  box-shadow: 0 18px 46px rgba(15, 23, 42, .08);
}

.lock-mark {
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  border-radius: 18px;
  color: #fff;
  background: var(--wechat);
  font-size: 26px;
  font-weight: 800;
}

.login-card h2 {
  margin: 24px 0 0;
  font-size: 26px;
  letter-spacing: -.03em;
}

.login-card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.75;
}

.login-card small {
  display: block;
  margin-top: 16px;
  color: #8a8a8a;
  font-size: 12px;
  line-height: 1.7;
}

.wechat-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  margin-top: 24px;
  padding: 0 20px;
  border-radius: 12px;
  color: #fff;
  background: var(--wechat);
  font-size: 15px;
  font-weight: 800;
}

.permission-notes {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 34px;
}

.permission-notes article {
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #fff;
}

.permission-notes b {
  display: block;
  font-size: 15px;
}

.permission-notes p {
  margin: 10px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.locked-article {
  max-width: 760px;
  padding-top: 80px;
}

.locked-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 32px;
}

.secondary-link {
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.article-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin-top: 26px;
}

.preview-card {
  padding: 24px;
  background: var(--panel);
}

.preview-card h3 {
  margin: 18px 0 0;
  font-size: 22px;
  letter-spacing: -.02em;
}

.preview-card p {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.75;
}

.action-box {
  margin-top: 18px;
  padding: 16px;
  border-radius: 14px;
  color: #1e3a8a;
  background: var(--blue-soft);
  font-size: 14px;
  line-height: 1.65;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 760px) 240px;
  gap: 56px;
  align-items: start;
}

.article {
  min-width: 0;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-size: 12px;
}

.article-body {
  margin-top: 42px;
  color: #262626;
  font-size: 17px;
  line-height: 2;
}

.article-body h2 {
  margin: 46px 0 12px;
  font-size: 28px;
  line-height: 1.35;
  letter-spacing: -.02em;
}

.article-body p {
  margin: 16px 0;
}

.article-body ul {
  margin: 18px 0;
  padding-left: 1.2em;
}

.article-body li {
  margin: 8px 0;
}

.article-body blockquote {
  margin: 28px 0;
  padding: 16px 20px;
  border-left: 4px solid var(--blue);
  border-radius: 0 14px 14px 0;
  color: #1e3a8a;
  background: var(--blue-soft);
  font-weight: 700;
}

.toc {
  position: sticky;
  top: 104px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.toc strong {
  display: block;
  margin-bottom: 12px;
  font-size: 13px;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-size: 13px;
}

.next-links {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin-top: 50px;
}

.next-links a {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}

.next-links small {
  display: block;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 11px;
}

.next-links b {
  display: block;
  margin-top: 8px;
  font-size: 16px;
}

@media (max-width: 860px) {
  .wiki-shell {
    display: block;
  }

  .sidebar {
    position: static;
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .sidebar .nav-group:nth-of-type(n + 2),
  .sidebar-foot,
  .top-actions,
  .toc {
    display: none;
  }

  .topbar {
    position: static;
    display: block;
    min-height: auto;
    padding: 16px 20px;
  }

  .search {
    max-width: none;
  }

  .content {
    padding: 34px 20px 52px;
  }

  .hero,
  .auth-panel,
  .article-layout,
  .article-preview,
  .next-links {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 38px;
  }

  .lead {
    font-size: 16px;
  }

  .chapter-grid {
    grid-template-columns: 1fr;
  }

  .chapter-grid.handbook-two-col {
    grid-template-columns: 1fr;
  }

  .permission-notes {
    grid-template-columns: 1fr;
  }

  .article-body {
    font-size: 16px;
    line-height: 1.9;
  }
}

/* ===== White Wiki V2 · 2026.07 ===== */
:root {
  --bg: #fff;
  --panel: #fafafa;
  --ink: #17181a;
  --muted: #6b6f76;
  --soft: #f5f6f8;
  --line: #e6e7ea;
  --blue: #315efb;
  --blue-soft: #edf2ff;
  --gold: #b77716;
  --green: #16a34a;
  --radius: 14px;
}

body { background: #fff; color: var(--ink); }
.wiki-shell { grid-template-columns: 274px minmax(0, 1fr); }
.sidebar { padding: 28px 20px; background: #fafafa; }
.brand { gap: 13px; padding: 0 8px 24px; }
.brand-mark { width: 40px; height: 40px; border-radius: 12px; font-size: 18px; }
.brand strong { font-size: 15px; }
.brand span:not(.brand-mark) { font-size: 11px; }
.nav-group { margin-top: 22px; }
.nav-title { margin: 20px 0 9px; font-size: 10px; }
.nav-item { min-height: 38px; padding: 0 10px; border-radius: 10px; font-size: 13px; }
.nav-item.active, .nav-item:hover { color: var(--blue); background: var(--blue-soft); }
.nav-item.locked small { color: var(--gold); }
.sidebar-foot { margin-top: 26px; border-radius: 14px; padding: 15px; }
.topbar { min-height: 70px; padding: 0 38px; }
.search { width: min(510px, 100%); height: 40px; border-radius: 11px; background: var(--soft); font-size: 13px; }
.top-actions { font-family: var(--mono); font-size: 11px; }
.pill { height: 36px; border-radius: 9px; color: var(--ink); font-family: var(--sans); font-weight: 700; }
.content { max-width: none; padding: 54px 64px 70px; }
.eyebrow { display: inline-flex; align-items: center; min-height: 28px; padding: 0 12px; border-radius: 999px; background: var(--blue-soft); color: var(--blue); font-size: 10px; letter-spacing: .07em; }
.private-eyebrow { color: var(--blue); background: var(--blue-soft); }

.manual-home .top-login { border-color: var(--ink); color: var(--ink); }
.home-hero-v2 { display: grid; grid-template-columns: minmax(0, 1fr) 390px; gap: 58px; align-items: center; }
.home-hero-v2 h1 { margin: 22px 0 20px; max-width: 760px; font-size: clamp(46px, 4.1vw, 60px); line-height: 1.08; letter-spacing: -.05em; }
.home-hero-v2 .lead { max-width: 680px; margin: 0; color: #555a62; font-size: 17px; line-height: 1.8; }
.home-buttons { display: flex; gap: 12px; margin-top: 30px; }
.home-button { display: inline-flex; align-items: center; justify-content: space-between; gap: 26px; min-height: 44px; padding: 0 18px; border: 1px solid var(--line); border-radius: 10px; font-size: 13px; font-weight: 800; }
.home-button.primary { border-color: var(--ink); color: #fff; background: var(--ink); }
.reading-map { padding: 24px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 14px 40px rgba(26,32,44,.07); }
.reading-map-head { display: flex; justify-content: space-between; margin-bottom: 18px; font: 700 10px/1 var(--mono); letter-spacing: .1em; color: var(--muted); }
.reading-map-head b { color: var(--blue); }
.reading-map-row { display: grid; grid-template-columns: 38px 1fr auto; align-items: center; gap: 12px; padding: 14px 0; border-top: 1px solid var(--line); }
.reading-map-row i { display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px; background: var(--soft); font: normal 11px/1 var(--mono); }
.reading-map-row strong { display: block; font-size: 13px; }
.reading-map-row p { margin: 4px 0 0; color: var(--muted); font-size: 11px; }
.reading-tag { padding: 5px 8px; border-radius: 999px; color: var(--blue); background: var(--blue-soft); font-size: 10px; }
.reading-tag.member { color: var(--gold); background: #fff5e6; }
.path-head { display: flex; align-items: end; justify-content: space-between; margin: 52px 0 17px; }
.path-head h2 { margin: 0; font-size: 25px; letter-spacing: -.02em; }
.path-head p { margin: 0; color: var(--muted); font-size: 12px; }
.reading-paths { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.reading-path { min-height: 132px; padding: 19px; border: 1px solid var(--line); border-radius: 15px; }
.reading-path.current { border-color: #aec0ff; background: #f8faff; }
.reading-path small { color: var(--blue); font: 10px/1 var(--mono); }
.reading-path h3 { margin: 22px 0 8px; font-size: 17px; }
.reading-path p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.55; }

.reading-progress { height: 3px; background: #eef0f3; }
.reading-progress span { display: block; width: 36%; height: 100%; background: var(--blue); }
.article-layout { grid-template-columns: minmax(0, 760px) 220px; gap: 74px; max-width: 1080px; margin: 0 auto; }
.article { padding-top: 16px; }
.article h1 { margin: 19px 0 18px; font-size: clamp(40px, 4vw, 52px); line-height: 1.15; letter-spacing: -.045em; }
.article > .lead { margin-bottom: 18px; color: #4e535a; font-size: 18px; line-height: 1.8; }
.article-meta { gap: 20px; padding-bottom: 24px; border-bottom: 1px solid var(--line); color: var(--muted); font-size: 10px; }
.article-body { color: #30343a; font-size: 16px; line-height: 1.95; }
.article-body p { margin: 22px 0; }
.article-body blockquote { margin: 26px 0; padding: 18px 22px; border: 0; border-left: 3px solid var(--blue); border-radius: 0 12px 12px 0; background: #f7f9ff; font-size: 18px; font-weight: 800; line-height: 1.65; }
.toc { padding-top: 26px; }
.toc strong { color: var(--ink); font-size: 12px; }
.toc a { margin-top: 14px; color: var(--muted); font-size: 12px; }
.toc a:first-of-type { color: var(--blue); font-weight: 700; }
.next-links a { border-radius: 14px; }

.member-preview-shell { display: grid; grid-template-columns: 274px minmax(0, 1fr); min-height: 100vh; }
.preview-main { min-width: 0; }
.member-preview { max-width: 1030px; margin: 0 auto; padding: 58px 54px 70px; }
.preview-heading { display: flex; justify-content: space-between; gap: 30px; align-items: start; }
.preview-heading h1 { margin: 20px 0 12px; font-size: clamp(40px, 4vw, 52px); line-height: 1.15; letter-spacing: -.045em; }
.preview-heading p { margin: 0; color: var(--muted); font-size: 15px; }
.member-badge { flex: none; padding: 8px 12px; border: 1px solid #f0d4aa; border-radius: 999px; color: var(--gold); background: #fffaf2; font: 700 10px/1 var(--mono); }
.preview-grid { display: grid; grid-template-columns: minmax(0, 1fr) 390px; gap: 42px; margin-top: 28px; }
.preview-copy { position: relative; max-height: 540px; overflow: hidden; color: #33373d; font-size: 16px; line-height: 1.95; }
.preview-copy::after { content: ""; position: absolute; right: 0; bottom: 0; left: 0; height: 240px; background: linear-gradient(transparent, #fff 84%); pointer-events: none; }
.preview-copy p { margin: 0 0 22px; }
.unlock-card { padding: 26px; border: 1px solid var(--line); border-radius: 18px; background: #fff; box-shadow: 0 16px 44px rgba(20,24,36,.08); }
.unlock-icon { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 12px; color: var(--blue); background: var(--blue-soft); font-size: 18px; }
.unlock-card h2 { margin: 20px 0 10px; font-size: 23px; }
.unlock-card > p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.unlock-form { display: grid; gap: 10px; margin-top: 22px; }
.unlock-form input { width: 100%; height: 44px; padding: 0 13px; border: 1px solid var(--line); border-radius: 10px; font: 14px var(--sans); }
.unlock-form button { display: flex; align-items: center; justify-content: space-between; height: 44px; padding: 0 15px; border: 0; border-radius: 10px; color: #fff; background: var(--ink); font-weight: 800; cursor: pointer; }
.unlock-list { margin: 20px 0 0; padding: 18px 0 0; border-top: 1px solid var(--line); list-style: none; }
.unlock-list li { margin-top: 10px; font-size: 12px; }
.unlock-list li::before { content: "✓"; margin-right: 9px; color: var(--blue); }
.unlock-learn { display: block; margin-top: 19px; text-align: center; color: var(--blue); font-size: 11px; }

@media (max-width: 980px) {
  .home-hero-v2, .preview-grid { grid-template-columns: 1fr; }
  .reading-map { display: none; }
  .reading-paths { grid-template-columns: 1fr; }
  .path-head { display: block; }
  .path-head p { margin-top: 10px; text-align: left; }
  .member-preview { padding: 40px 24px 60px; }
}

@media (max-width: 860px) {
  .wiki-shell, .member-preview-shell { display: block; }
  .sidebar { position: static; min-height: auto; padding: 18px; border-right: 0; border-bottom: 1px solid var(--line); }
  .sidebar .nav-group, .sidebar-foot { display: none; }
  .brand { padding-bottom: 0; border-bottom: 0; }
  .topbar { position: static; padding: 14px 18px; }
  .content { padding: 34px 20px 52px; }
  .home-hero-v2 h1 { font-size: 40px; }
  .home-buttons { flex-direction: column; }
  .article-layout { grid-template-columns: 1fr; }
  .toc { display: none; }
  .preview-heading { display: block; }
  .member-badge { display: inline-block; margin-top: 18px; }
}

.manual-back {
  display: block;
  margin: 14px 8px 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .04em;
}

.manual-back:hover {
  color: var(--blue);
}

/* Mobile white-wiki navigation and reading rhythm */
@media (max-width: 860px) {
  .sidebar {
    position: sticky;
    top: 0;
    z-index: 30;
    padding: 14px 16px 0;
    background: rgba(250,250,250,.95);
    backdrop-filter: blur(14px);
  }

  .brand {
    display: inline-flex;
    padding: 0;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    font-size: 15px;
  }

  .brand strong {
    font-size: 13px;
  }

  .brand span:not(.brand-mark) {
    font-size: 10px;
  }

  .manual-back {
    position: absolute;
    top: 20px;
    right: 16px;
    margin: 0;
    font-size: 9px;
  }

  .sidebar .nav-group:first-of-type {
    display: flex;
    gap: 6px;
    margin: 13px -16px 0;
    padding: 10px 16px;
    overflow-x: auto;
    border-top: 1px solid var(--line);
    scrollbar-width: none;
  }

  .sidebar .nav-group:first-of-type::-webkit-scrollbar {
    display: none;
  }

  .sidebar .nav-group:first-of-type .nav-title {
    display: none;
  }

  .sidebar .nav-group:first-of-type .nav-item {
    flex: 0 0 auto;
    min-height: 34px;
    padding: 0 11px;
    border: 1px solid var(--line);
    background: #fff;
    font-size: 11px;
  }

  .sidebar .nav-group:first-of-type .nav-item.active {
    border-color: #b9c7ff;
    background: var(--blue-soft);
  }

  .topbar {
    display: none;
  }

  .content {
    padding: 42px 18px 66px;
  }

  .home-hero-v2 h1 {
    margin-top: 20px;
    font-size: 35px;
    line-height: 1.15;
  }

  .home-hero-v2 .lead {
    font-size: 14px;
    line-height: 1.8;
  }

  .home-buttons {
    gap: 9px;
    margin-top: 26px;
  }

  .home-button {
    min-height: 43px;
    font-size: 12px;
  }

  .path-head {
    margin-top: 58px;
  }

  .reading-paths {
    gap: 10px;
  }

  .reading-path {
    min-height: 126px;
    padding: 18px;
  }

  .article {
    padding-top: 4px;
  }

  .article h1 {
    font-size: 35px;
  }

  .article > .lead {
    font-size: 15px;
  }

  .article-body {
    margin-top: 34px;
    font-size: 16px;
    line-height: 1.95;
  }

  .article-body h2 {
    font-size: 24px;
  }

  .next-links {
    gap: 10px;
  }

  .member-preview {
    padding: 42px 18px 64px;
  }

  .preview-heading h1 {
    font-size: 35px;
  }

  .preview-grid {
    gap: 28px;
  }

  .unlock-card {
    padding: 22px;
  }
}