:root{--navy:#0b1f3a;--navy-deep:#071427;--ink:#10233d;--slate:#24405f;--blue:#2266b4;--blue-tint:#d9ebff;--green:#347029;--green-tint:#dff4d8;--orange:#ff7a1a;--orange-tint:#ffd5a8;--gold:#c1a235;
  --green-bright:#7ed957;
  --bg:#ffffff;--fg:var(--ink);--muted:var(--slate);--maxw:1080px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased;
  font:17px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.narrow{max-width:780px}
a{color:var(--green)}
a:focus-visible,button:focus-visible,summary:focus-visible,.btn:focus-visible{
  outline:3px solid var(--gold);outline-offset:2px}
.skip{position:absolute;left:-999px}
.skip:focus{left:8px;top:8px;z-index:30;background:#fff;padding:10px 14px;border-radius:8px}
h1{font-size:clamp(2rem,4.4vw,3rem);line-height:1.08;letter-spacing:-.02em;color:var(--navy);margin:.1em 0 .35em;font-weight:800}
h2{font-size:clamp(1.5rem,3vw,2rem);letter-spacing:-.01em;color:var(--navy);margin:0 0 .5em;font-weight:800}
h3{font-size:1.15rem;color:var(--navy);margin:0 0 .3em;font-weight:700}
p{margin:0 0 1em}
.lede{font-size:1.2rem;line-height:1.55;color:var(--ink)}
.muted,.micro{color:var(--muted)}
.micro{font-size:.9rem}
.eyebrow{text-transform:uppercase;letter-spacing:.12em;font-size:.78rem;font-weight:800;color:var(--green);margin:0 0 .5em}
.section{padding:56px 0}
.section-head{max-width:640px;margin:0 auto 30px;text-align:center}
.center{text-align:center}
/* header (sticky) */
.site-head{position:sticky;top:0;z-index:20;background:var(--navy);color:#fff;box-shadow:0 1px 0 rgba(255,255,255,.08)}
.head-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 24px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:1.4rem;text-decoration:none;letter-spacing:-.01em}
.brand-mark{height:38px;width:auto;display:block}
.brand-word{white-space:nowrap}
.brand-b{color:#fff}.brand-m{color:var(--green-bright);font-style:italic}
.nav{display:flex;gap:22px;align-items:center}
.nav a{color:#dbe6f5;text-decoration:none;font-weight:600;font-size:.98rem}
.nav a:hover{color:#fff}
.nav .btn-app{height:40px;padding:0 16px;border-radius:9px;font-size:.95rem;margin-left:2px}
@media(max-width:720px){.nav a:not(.btn-app){display:none}}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:0 22px;height:50px;
  border-radius:12px;font-weight:700;font-size:1rem;text-decoration:none;border:2px solid transparent;
  transition:transform .12s,box-shadow .12s,filter .12s}
.btn:hover{transform:translateY(-1px)}
.btn-app{background:var(--orange);color:var(--navy-deep);box-shadow:0 6px 18px rgba(255,122,26,.35)}
.btn-app:hover{filter:brightness(1.04);box-shadow:0 8px 22px rgba(255,122,26,.45)}
.btn-read{background:var(--blue);color:#fff}
.btn-listen{background:var(--green);color:#fff}
.btn-ghost{background:transparent;color:var(--navy);border-color:#cdd8e6}
.btn-ghost:hover{border-color:var(--navy)}
.on-dark .btn-ghost{color:#fff;border-color:rgba(255,255,255,.45)}
.on-dark .btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.cta-row{display:flex;gap:14px;flex-wrap:wrap;margin:22px 0}
/* hero (home) */
.hero{background:radial-gradient(1100px 460px at 82% -20%,#1c477f 0,transparent 60%),
  linear-gradient(158deg,#0b1f3a 0,#13294b 58%,#0b1f3a 100%);color:#fff}
.hero-inner{max-width:var(--maxw);margin:0 auto;padding:66px 24px 74px;display:grid;
  grid-template-columns:1.08fr .92fr;gap:44px;align-items:center}
.hero h1{color:#fff}
.hero .eyebrow{color:var(--green-bright)}
.hero .accent{color:var(--green-bright)}
.hero .lede{color:#cfdcec}
.center-row{justify-content:center}
.hero-art{display:flex;justify-content:center}
.hero-art img{width:min(300px,78%);height:auto;filter:drop-shadow(0 22px 44px rgba(0,0,0,.45))}
.trust{display:flex;gap:26px;flex-wrap:wrap;margin-top:24px;color:#9fb3cc;font-size:.92rem;font-weight:600}
.trust b{color:#fff}
@media(max-width:820px){.hero-inner{grid-template-columns:1fr;padding:44px 24px 52px;text-align:center}
  .hero .cta-row,.trust{justify-content:center}.hero-art{order:-1}.hero-art img{width:170px}}
/* bands */
.band{background:var(--blue-tint)}
.band-navy{background:linear-gradient(160deg,#0b1f3a,#16345f);color:#fff}
.band-navy h2,.band-navy .lede{color:#fff}
.cta-band{max-width:960px;margin:0 auto;text-align:center;border-radius:24px;padding:52px 24px;
  background:linear-gradient(160deg,#0b1f3a,#16345f);color:#fff}
.cta-band h2{color:#fff}
.pagehead{padding:48px 0 6px}
/* book cover shelf */
.shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(176px,1fr));gap:26px}
.bk-link{display:block;text-decoration:none;color:var(--fg)}
.bk-cover{position:relative;display:flex;flex-direction:column;justify-content:space-between;
  aspect-ratio:3/4;border-radius:10px;padding:18px 16px;color:#fff;overflow:hidden;
  box-shadow:0 10px 24px rgba(11,31,58,.18);border-left:6px solid rgba(255,255,255,.28);
  transition:transform .14s,box-shadow .14s}
.bk-link:hover .bk-cover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(11,31,58,.30)}
.bk-cover .cat{font-size:.66rem;text-transform:uppercase;letter-spacing:.1em;font-weight:800;opacity:.82;padding-right:46px}
.bk-cover .ttl{font-size:1.12rem;line-height:1.2;font-weight:800;letter-spacing:-.01em;
  display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.bk-cover .cby{font-size:.8rem;opacity:.85;font-style:italic}
.bk-cover .rating{position:absolute;top:13px;right:12px;background:rgba(255,255,255,.92);color:var(--navy-deep)}
.bk-foot{display:flex;align-items:baseline;justify-content:space-between;gap:8px;margin-top:11px}
.bk-foot .name{font-weight:700;font-size:.95rem;color:var(--navy);line-height:1.25;
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.bk-foot .go{color:var(--green);font-weight:800;font-size:.86rem;white-space:nowrap}
/* deterministic cover palettes (CSP-safe classes, all AA for white text) */
.cov-0{background:linear-gradient(150deg,#0b1f3a,#16345f)}
.cov-1{background:linear-gradient(150deg,#17457f,#2266b4)}
.cov-2{background:linear-gradient(150deg,#2c5e26,#45873a)}
.cov-3{background:linear-gradient(150deg,#0d4a4a,#17706b)}
.cov-4{background:linear-gradient(150deg,#3a2350,#5f3d80)}
.cov-5{background:linear-gradient(150deg,#24405f,#37608c)}
.cov-6{background:linear-gradient(150deg,#6b3410,#9a5016)}
.cov-7{background:linear-gradient(150deg,#5a1220,#8f2233)}
/* feature cards */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px}
.feat{background:#fff;border:1px solid #e7edf4;border-radius:16px;padding:26px}
.feat .ic{width:46px;height:46px;border-radius:12px;display:flex;align-items:center;justify-content:center;
  font-size:1.4rem;margin-bottom:14px;background:var(--green-tint);color:var(--green)}
.feat:nth-child(3n+2) .ic{background:var(--blue-tint);color:var(--blue)}
.feat:nth-child(3n+3) .ic{background:var(--orange-tint);color:var(--navy-deep)}
.feat h3{margin-bottom:.35em}
.feat p{margin:0;color:var(--ink)}
.feat-link{display:block;text-decoration:none;color:inherit;transition:transform .14s,box-shadow .14s}
.feat-link:hover{transform:translateY(-3px)}
.feat-link:hover .feat{box-shadow:0 12px 28px rgba(11,31,58,.12);border-color:#d7e0ec}
/* rating badge */
.rating{display:inline-block;font-size:.72rem;font-weight:800;padding:3px 9px;border-radius:20px;
  background:var(--green-tint);color:var(--green);letter-spacing:.03em}
.rating-PG13,.rating-PG{background:var(--orange-tint);color:var(--navy-deep)}
/* category chips */
.chip-nav,.foot-nav{display:flex;gap:10px;flex-wrap:wrap}
.chip-nav{justify-content:center}
.chip{background:#fff;border:1px solid #dfe7f0;color:var(--navy);padding:8px 15px;border-radius:22px;
  text-decoration:none;font-weight:600;font-size:.95rem}
.chip:hover{border-color:var(--green);color:var(--green)}
.chip .n{color:var(--muted);font-weight:500}
.more{font-weight:800;text-decoration:none;color:var(--green);display:inline-block;margin-top:8px}
/* book detail */
.crumbs{max-width:var(--maxw);margin:16px auto 0;padding:0 24px;font-size:.88rem;color:var(--muted)}
.crumbs a{text-decoration:none}
.book{padding:22px 24px 40px}
.chips{display:flex;gap:8px;flex-wrap:wrap;padding:0;list-style:none}
.chips li{background:var(--green-tint);color:var(--green);padding:5px 13px;border-radius:20px;font-size:.9rem;font-weight:600}
.feature-list{padding:0;list-style:none}
.feature-list li{padding-left:28px;position:relative;margin:.5em 0}
.feature-list li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800}
.tags,.pd-note{font-size:.9rem;color:var(--muted)}
.pd-note{border-top:1px solid #e7edf4;padding-top:16px;margin-top:28px}
/* pricing */
.price-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px;margin:24px auto}
.price-card{border:1px solid #e7edf4;border-radius:20px;padding:28px;background:#fff;display:flex;flex-direction:column}
.price-card.featured{border:2px solid var(--green);box-shadow:0 14px 40px rgba(69,135,58,.16);position:relative}
.price-card.featured::before{content:"Best value";position:absolute;top:-13px;left:28px;background:var(--green);
  color:#fff;font-size:.72rem;font-weight:800;padding:4px 12px;border-radius:20px;letter-spacing:.04em}
.price-card ul{padding:0;list-style:none;margin:0 0 22px;flex:1}
.price-card li{padding-left:26px;position:relative;margin:.55em 0}
.price-card li::before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800}
.price-card .btn{width:100%}
.price{font-size:1.8rem;font-weight:800;color:var(--navy);margin:.1em 0 .7em}
details{border:1px solid #e7edf4;border-radius:12px;padding:14px 18px;margin:12px 0;background:#fff}
summary{font-weight:700;cursor:pointer;color:var(--navy)}
details[open] summary{margin-bottom:.5em}
/* doc pages */
.doc{padding:24px 24px 40px}
.doc h2{margin-top:1.4em;font-size:1.35rem}
.doc code{background:var(--blue-tint);padding:2px 6px;border-radius:5px;font-size:.9em}
/* footer */
.site-foot{background:var(--navy);color:#c7d4e6;margin-top:64px;padding:40px 0}
.site-foot .brand{margin-bottom:14px;display:inline-flex}
.site-foot a{color:#fff;text-decoration:none;font-weight:600}
.site-foot a:hover{text-decoration:underline}
.foot-nav{margin-bottom:14px;gap:18px}
.foot-note{font-size:.9rem;color:#8ea3bf;max-width:660px}
@media(max-width:560px){.section{padding:40px 0}.shelf{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:16px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}