:root { --landing-ink: #111b36; --landing-muted: #66728a; --landing-line: #dce3f0; --landing-violet: #6d43ff; --landing-violet-dark: #4f27dc; --landing-soft: #f5f3ff; }
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.landing-page { margin: 0; color: var(--landing-ink); background: #f8f9fd; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.landing-nav { position: sticky; top: 0; z-index: 40; display: flex; align-items: center; gap: 28px; min-height: 72px; padding: 10px max(24px, calc((100vw - 1440px) / 2)); border-bottom: 1px solid rgba(220,227,240,.88); background: rgba(255,255,255,.92); backdrop-filter: blur(18px); }
.landing-brand { display: flex; align-items: center; gap: 10px; color: inherit; text-decoration: none; }
.landing-brand img { width: 40px; height: 40px; object-fit: contain; }
.landing-brand span { display: grid; line-height: 1.05; }
.landing-brand strong { font-size: 18px; }
.landing-brand small { margin-top: 5px; color: var(--landing-muted); font-size: 10px; letter-spacing: .04em; }
.landing-nav-links { display: flex; align-items: center; gap: 22px; margin-left: auto; }
.landing-nav a { color: var(--landing-ink); text-decoration: none; font-weight: 700; }
.landing-nav-links a:hover { color: var(--landing-violet); }
.landing-nav-actions { display: flex; align-items: center; gap: 12px; }
.landing-locale select { min-height: 38px; border: 1px solid var(--landing-line); border-radius: 10px; padding: 0 30px 0 10px; background: #fff; color: var(--landing-muted); }
.landing-button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 0 20px; border: 1px solid var(--landing-line); border-radius: 12px; text-decoration: none; font-weight: 800; }
.landing-nav .landing-button-primary, .landing-button-primary { border-color: var(--landing-violet); background: var(--landing-violet); color: #fff; box-shadow: 0 8px 22px rgba(109,67,255,.18); }
.landing-button-primary:hover { background: var(--landing-violet-dark); }
.landing-button-secondary { background: #fff; color: var(--landing-ink); }
.landing-section { width: min(1440px, calc(100% - 48px)); margin: 0 auto; padding: 80px 0; }
.landing-hero { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(360px, .8fr); align-items: center; gap: 72px; min-height: 650px; }
.landing-kicker { margin: 0 0 12px; color: var(--landing-violet); font-size: 13px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.landing-hero h1 { max-width: 850px; margin: 0; font-size: clamp(44px, 5.1vw, 76px); line-height: 1.04; letter-spacing: -.045em; }
.landing-lead { max-width: 760px; margin: 24px 0 0; color: var(--landing-muted); font-size: clamp(18px, 1.7vw, 23px); line-height: 1.65; }
.landing-hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.landing-fine-print { color: var(--landing-muted); font-size: 13px; }
.landing-hero-proof { display: grid; gap: 14px; padding: 22px; border: 1px solid #ded8ff; border-radius: 28px; background: linear-gradient(145deg,#fff 20%,#f1edff); box-shadow: 0 28px 70px rgba(50,42,100,.12); }
.landing-hero-proof div { display: grid; gap: 7px; padding: 24px; border: 1px solid rgba(220,227,240,.9); border-radius: 18px; background: rgba(255,255,255,.88); }
.landing-hero-proof b { font-size: 18px; }
.landing-hero-proof span { color: var(--landing-muted); line-height: 1.55; }
.landing-section-head { max-width: 900px; margin-bottom: 30px; }
.landing-section-head h2, .landing-split h2, .landing-membership h2, .landing-final-cta h2 { margin: 0; font-size: clamp(30px, 3.2vw, 48px); line-height: 1.12; letter-spacing: -.035em; }
.landing-section-head p:not(.landing-kicker), .landing-split > div > p:not(.landing-kicker), .landing-membership > div > p:not(.landing-kicker), .landing-final-cta > p:not(.landing-kicker) { color: var(--landing-muted); font-size: 17px; line-height: 1.65; }
.landing-section-head-row { display: flex; align-items: end; justify-content: space-between; gap: 24px; max-width: none; }
.landing-section-head-row > div { max-width: 900px; }
.landing-plus-pill { flex: 0 0 auto; margin-bottom: 8px; padding: 9px 14px; border: 1px solid #d7ccff; border-radius: 999px; background: var(--landing-soft); color: var(--landing-violet-dark); font-size: 12px; font-weight: 900; }
.landing-loop { padding-top: 30px; }
.landing-loop-grid, .landing-source-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.landing-loop-grid article, .landing-source-grid article { padding: 28px; border: 1px solid var(--landing-line); border-radius: 20px; background: #fff; }
.landing-loop-grid article > span { color: var(--landing-violet); font-weight: 900; }
.landing-loop-grid h3 { margin: 34px 0 8px; font-size: 21px; }
.landing-loop-grid p, .landing-source-grid p { margin: 0; color: var(--landing-muted); line-height: 1.6; }
.landing-card-section { width: min(1500px, calc(100% - 40px)); }
.landing-card-grid { display: grid; align-items: start; gap: 18px; }
.landing-card-grid-recommendations { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.landing-card-grid-explore { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.landing-card-grid > .book-card, .landing-card-grid > .nb-entity-card { min-width: 0; }
.landing-card-grid .book-card { height: auto; }
.landing-card-grid .nb-entity-card { grid-template-columns: minmax(120px, 31%) minmax(0, 1fr); }
.landing-data-status { padding: 22px; border: 1px dashed var(--landing-line); border-radius: 16px; color: var(--landing-muted); text-align: center; }
.landing-data-status.is-error { color: #a23a3a; background: #fff6f6; }
.landing-plus-note { display: flex; justify-content: space-between; gap: 20px; margin: 18px 0 0; padding: 16px 20px; border: 1px solid #d7ccff; border-radius: 14px; background: var(--landing-soft); color: var(--landing-muted); }
.landing-plus-note span:first-child { color: var(--landing-violet-dark); font-weight: 900; }
.landing-sources { border-top: 1px solid var(--landing-line); }
.landing-source-grid strong { display: block; margin-bottom: 12px; font-size: 19px; }
.landing-text-link { display: inline-block; margin-top: 22px; color: var(--landing-violet-dark); font-weight: 900; text-decoration: none; }
.landing-split { display: grid; grid-template-columns: 1fr 1fr; gap: 70px; align-items: center; padding: 70px; border: 1px solid #ded8ff; border-radius: 28px; background: #fff; }
.landing-account-list { display: grid; gap: 12px; }
.landing-account-list div { display: grid; gap: 5px; padding: 18px 20px; border: 1px solid var(--landing-line); border-radius: 14px; }
.landing-account-list span { color: var(--landing-muted); }
.landing-membership { display: grid; grid-template-columns: .75fr 1.25fr; gap: 64px; align-items: center; }
.landing-plan-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.landing-plan-grid article { padding: 28px; border: 1px solid var(--landing-line); border-radius: 22px; background: #fff; }
.landing-plan-grid article.featured { border-color: #bbaaff; box-shadow: 0 20px 46px rgba(109,67,255,.12); }
.landing-plan-grid article > span { color: var(--landing-violet); font-size: 13px; font-weight: 900; text-transform: uppercase; }
.landing-plan-grid h3 { min-height: 50px; margin: 10px 0 18px; }
.landing-plan-grid ul { min-height: 138px; padding-left: 20px; color: var(--landing-muted); line-height: 1.85; }
.landing-faq { max-width: 980px; }
.landing-faq details { border-top: 1px solid var(--landing-line); background: #fff; }
.landing-faq details:last-child { border-bottom: 1px solid var(--landing-line); }
.landing-faq summary { padding: 22px 4px; cursor: pointer; font-size: 18px; font-weight: 800; }
.landing-faq details p { margin: 0; padding: 0 4px 24px; color: var(--landing-muted); line-height: 1.65; }
.landing-final-cta { margin-bottom: 70px; padding: 70px; border-radius: 30px; background: #17162b; color: #fff; text-align: center; }
.landing-final-cta > p { max-width: 680px; margin-left: auto; margin-right: auto; color: #c8c5dc !important; }
.landing-final-cta .landing-button { margin: 14px 5px 0; }
.landing-product-link { display: block; width: fit-content; margin: 18px auto 0; color: #d9d2ff; }
.landing-footer { display: flex; justify-content: center; gap: 30px; padding: 30px; border-top: 1px solid var(--landing-line); color: var(--landing-muted); }
.landing-footer a { color: inherit; }

@media (max-width: 1319px) {
  .landing-card-grid-recommendations, .landing-card-grid-explore { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 1100px) {
  .landing-nav-links { display: none; }
  .landing-card-grid-recommendations, .landing-card-grid-explore { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .landing-hero, .landing-membership { grid-template-columns: 1fr; }
  .landing-hero { gap: 36px; padding-top: 58px; }
  .landing-hero-proof { grid-template-columns: repeat(3, 1fr); }
  .landing-hero-proof div { padding: 18px; }
}
@media (max-width: 720px) {
  .landing-nav { padding: 10px 16px; }
  .landing-brand small, .landing-login, .landing-locale { display: none; }
  .landing-section, .landing-card-section { width: min(100% - 28px, 1440px); padding: 56px 0; }
  .landing-hero { min-height: auto; }
  .landing-hero h1 { font-size: 42px; }
  .landing-hero-proof, .landing-loop-grid, .landing-source-grid, .landing-card-grid-recommendations, .landing-card-grid-explore, .landing-plan-grid { grid-template-columns: 1fr; }
  .landing-section-head-row, .landing-plus-note { align-items: flex-start; flex-direction: column; }
  .landing-split { width: min(100% - 28px, 1440px); grid-template-columns: 1fr; gap: 30px; padding: 34px 24px; }
  .landing-membership { gap: 30px; }
  .landing-final-cta { width: min(100% - 28px, 1440px); padding: 48px 22px; }
}

/* Prelaunch landing: expand coverage without squeezing labels into borders. */
.landing-page [hidden] { display:none !important; }
.landing-card-grid .coverage-all-grid { grid-template-columns:repeat(2,minmax(0,1fr)); }
.landing-card-grid .coverage-all-grid .cov-line { grid-template-columns:minmax(0,1fr) auto; gap:12px; padding:9px 10px; min-height:38px; border-right:1px solid #e2e8f0; border-bottom:1px solid #e2e8f0; }
.landing-card-grid .coverage-all-grid .cov-line:nth-child(2n) { border-right:0; }
.landing-card-grid .coverage-all-grid .cov-line span,.landing-card-grid .coverage-all-grid .cov-line b { font-size:12px; line-height:1.4; }
.landing-card-grid .nb-entity-title { overflow-wrap:anywhere; }
.landing-card-grid-explore { grid-template-columns:repeat(3,minmax(0,1fr)); }
.landing-launch { display:grid;grid-template-columns:1.5fr 1fr;gap:48px;padding:48px;border:1px solid #ded8ff;border-radius:28px;background:#fff; }
.landing-follow { padding:28px;background:#f5f3ff;border-radius:20px; }
.landing-follow strong { display:block;font-size:38px;margin:8px 0; }
.landing-follow p { color:#62708a;line-height:1.8; }
@media(max-width:1000px){.landing-card-grid-explore{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:680px){.landing-launch,.landing-card-grid-explore{grid-template-columns:1fr}.landing-launch{padding:26px;gap:20px}}

@media(max-width:1100px){.landing-nav{flex-wrap:wrap}.landing-nav-links{display:flex;order:3;width:100%;justify-content:center;gap:24px;padding-top:8px}.landing-footer{flex-wrap:wrap;gap:16px}}

.landing-hero-actions + .landing-fine-print{margin-top:18px;line-height:1.7}
.landing-wechat-qr{display:block;width:180px;height:180px;object-fit:contain;margin-bottom:20px;background:#fff}

/* Fixed public examples use the same independent-column layout as the book feed. */
#exampleBooks { grid-auto-rows:4px; row-gap:0; }
#exampleBooks > .book-card { display:block; width:100%; margin:0; align-self:start; }
.landing-hero-proof .landing-text-link { margin-top:8px; line-height:1.5; }

#exampleBooks { --example-columns:3; }
#exampleHero > .nb-entity-card { width:100%; }
@media(max-width:1000px) { #exampleBooks { --example-columns:2; } }
@media(max-width:680px) { #exampleBooks { --example-columns:1; } }

/* Separate collection counts from names without changing card hierarchy. */
.landing-page .nb-entity-main h3.nb-entity-title-row { display:flex; flex-wrap:wrap; align-items:center; column-gap:12px; row-gap:6px; }
.landing-page .nb-entity-count { display:inline-flex; flex:none; white-space:nowrap; padding:4px 8px; border-radius:6px; background:#f1edff; color:#68538f; line-height:1.2; }

/* Mobile public cards must shrink with their columns, including long sources. */
@media(max-width:680px) {
  .landing-page .nb-entity-main > * { min-width:0; max-width:100%; }
  .landing-page .nb-entity-source-row .nb-source-chip { white-space:normal; overflow-wrap:anywhere; line-height:1.5; }
  .landing-page .nb-entity-source-row .nb-source-chip > span { flex:none; }
  .landing-card-grid .nb-entity-card { grid-template-columns:96px minmax(0,1fr); gap:12px; }
  .landing-page .nb-entity-visual img { max-width:100%; }
  .reading-sources-page .source-detail-card-wide { grid-template-columns:minmax(0,1fr); }
  .reading-sources-page .source-detail-card-wide .source-logo-column { justify-items:start; }
  .reading-sources-page .source-detail-card-wide .source-logo-mark { width:104px; max-width:100%; }
  .reading-sources-page .source-detail-card-wide .source-narrative { grid-template-columns:minmax(0,1fr); }
}