:root{
  --ink:#1F2A36; --ink-2:#2A3644; --cream:#F6EFE4; --paper:#FBF7F0; --rule:#D9CBB6;
  --accent:#B5552B; --accent-dk:#8E3F1E; --accent-lt:#E59A72; --soft:#5B6470; --soft-dk:#C3C9D1;
  --serif:"Fraunces",Georgia,serif; --sans:"Inter",Verdana,system-ui,sans-serif; --mono:"IBM Plex Mono",ui-monospace,monospace;
  --wrap:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font:400 19px/1.65 var(--sans);-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 20px}
.mono{font:500 13px/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase}
h1,h2,h3{font-family:var(--serif);font-weight:500;line-height:1.12;margin:0;letter-spacing:-.01em}
h1 em,h2 em{font-style:italic;color:var(--accent-dk)}
.dark h2 em,.dark h1 em{color:var(--accent-lt)}
p{margin:0 0 1em}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:14px 26px;border-radius:6px;font:600 17px/1.2 var(--sans);text-decoration:none;cursor:pointer;border:2px solid transparent;transition:transform .15s ease,background .15s ease}
.btn:hover{transform:translateY(-1px)}
.btn:focus-visible,summary:focus-visible,a:focus-visible{outline:3px solid var(--accent-lt);outline-offset:3px}
.btn-primary{background:var(--accent-dk);color:#fff}
.btn-primary:hover{background:#7A3518}
.btn-ghost{border-color:var(--ink);color:var(--ink);background:transparent}
.dark .btn-ghost{border-color:#fff;color:#fff}
.btn svg{width:18px;height:18px;flex:none}

/* top bar */
.topbar{background:var(--ink);color:var(--soft-dk)}
.topbar .wrap{display:flex;justify-content:space-between;gap:16px;padding-top:10px;padding-bottom:10px}

/* hero */
.hero{padding:64px 0 80px;border-bottom:1px solid var(--rule)}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:64px;align-items:center}
.kicker{display:flex;align-items:center;gap:14px;color:var(--accent-dk);margin-bottom:24px}
.kicker span.line{flex:0 0 48px;height:1px;background:currentColor}
.hero h1{font-size:clamp(40px,5.6vw,68px)}
.hero .lede{font-size:20px;color:#3A4450;margin:26px 0 32px;max-width:36em}
.ctas{display:flex;flex-wrap:wrap;gap:14px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);margin-top:44px;border-top:1px solid var(--rule)}
.stats div{padding:18px 16px 0 0}
.stats b{display:block;font:500 34px/1.1 var(--serif)}
.stats div>span{font-size:15px;color:var(--soft)}
.portrait{position:relative;margin:0 0 0 24px;isolation:isolate}
.portrait::before{content:"";position:absolute;inset:28px -24px -24px 28px;background:var(--accent);border-radius:28px;z-index:-1;opacity:.9}
.portrait::after{content:"";position:absolute;top:-18px;left:-18px;width:120px;height:120px;border-radius:50%;background:radial-gradient(circle,var(--rule) 2px,transparent 2.5px) 0 0/14px 14px;z-index:-1}
.portrait .frame{border-radius:24px;overflow:hidden;box-shadow:0 30px 60px -20px rgba(31,42,54,.45)}
.portrait img{width:100%;aspect-ratio:4/5;object-fit:cover}
.portrait figcaption{position:absolute;top:18px;right:18px;background:rgba(251,247,240,.92);backdrop-filter:blur(6px);color:var(--ink);font-size:14px;font-weight:500;padding:8px 14px;border-radius:999px}
.quote-card{position:absolute;left:-44px;bottom:40px;max-width:300px;background:var(--ink);color:#fff;padding:22px 24px;border-radius:18px;box-shadow:0 24px 48px -12px rgba(31,42,54,.45)}
.quote-card p{font:italic 500 21px/1.35 var(--serif);margin:0 0 8px}
.quote-card span{color:var(--soft-dk);font-size:14px}

/* site nav */
.nav{background:var(--paper);border-bottom:1px solid var(--rule)}
.nav .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;min-height:68px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font:600 20px/1 var(--serif)}
.brand img{width:40px;height:40px;border-radius:50%}
.nav ul{display:flex;gap:6px;list-style:none;margin:0;padding:0}
.nav ul a{display:inline-flex;align-items:center;min-height:44px;padding:0 14px;border-radius:999px;text-decoration:none;font-size:16px;font-weight:500}
.nav ul a:hover,.nav ul a[aria-current]{background:var(--cream)}

/* home */
.home-hero{padding:72px 0 88px}
.home-hero .wrap{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center}
.home-hero h1{font-size:clamp(40px,5.4vw,66px)}
.home-hero .lede{font-size:20px;color:#3A4450;margin:24px 0 32px;max-width:34em}
.wide-photo{position:relative;margin:0;isolation:isolate}
.wide-photo::before{content:"";position:absolute;inset:-22px 28px 28px -22px;background:var(--cream);border:1px solid var(--rule);border-radius:28px;z-index:-1}
.wide-photo img{border-radius:24px;box-shadow:0 30px 60px -20px rgba(31,42,54,.45);aspect-ratio:1400/793;object-fit:cover;width:100%}
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.pillars article{border:1px solid #3B4857;border-radius:18px;padding:26px 22px}
.pillars .mono{color:var(--accent-lt)}
.pillars h3{font-size:24px;margin:10px 0 0}
.contact{display:flex;flex-wrap:wrap;gap:16px;align-items:center;justify-content:space-between;border:1px solid var(--rule);border-radius:18px;padding:28px;background:#fff}
.contact h3{font-size:28px}
.contact p{margin:6px 0 0;color:var(--soft)}
.card .actions{display:flex;flex-wrap:wrap;gap:10px}
.card .more{color:var(--accent-dk);font-weight:600;font-size:16px;text-decoration:none;display:inline-flex;align-items:center;min-height:44px}
.card{border-radius:18px}
.card .img img{border-radius:6px}
.free-tag{display:inline-block;background:#E3F1E8;color:#1F5A3A;font:600 14px/1 var(--sans);padding:7px 12px;border-radius:999px}

/* sections */
section{padding:96px 0}
.dark{background:var(--ink);color:#EEF0F2}
.cream{background:var(--cream)}
.sec-head{display:grid;grid-template-columns:auto 1fr;gap:12px 28px;align-items:start;margin-bottom:48px}
.sec-num{font:500 72px/0.9 var(--serif);color:var(--accent)}
.dark .sec-num{color:var(--accent-lt)}
.sec-head .mono{color:var(--accent-dk);padding-top:6px}
.dark .sec-head .mono{color:var(--accent-lt)}
.sec-head h2{grid-column:2;font-size:clamp(32px,4vw,48px)}
.sec-head p{grid-column:2;max-width:40em;color:var(--soft);margin-top:8px}
.dark .sec-head p{color:var(--soft-dk)}

/* product */
.product{display:grid;grid-template-columns:.8fr 1.2fr;gap:56px;align-items:start}
.cover-3d{margin:0;max-width:420px}
.cover-3d img{filter:drop-shadow(0 18px 30px rgba(31,42,54,.18))}
.cover{margin:0;background:#fff;border:1px solid var(--rule);padding:16px;border-radius:4px;box-shadow:0 24px 48px rgba(31,42,54,.12);transform:rotate(-1.2deg)}
.format{color:var(--soft)}
.product h3{font-size:34px;margin:10px 0 14px}
.price{display:flex;align-items:baseline;gap:12px;margin:22px 0}
.price b{font:500 52px/1 var(--serif)}
.price span{color:var(--soft);font-size:16px}
.checks{list-style:none;padding:0;margin:0 0 28px}
.checks li{display:flex;gap:12px;padding:9px 0;border-bottom:1px solid var(--rule)}
.checks svg{flex:none;width:22px;height:22px;margin-top:4px;color:var(--accent-dk)}
.guarantee{display:flex;gap:10px;align-items:center;margin-top:16px;color:var(--soft);font-size:16px}
.guarantee svg{width:22px;height:22px;color:var(--accent-dk);flex:none}

/* math */
.math{display:grid;grid-template-columns:1fr 1fr;border:1px solid #3B4857;border-radius:6px;overflow:hidden}
.math .col{padding:28px 28px 8px}
.math .col+.col{background:var(--ink-2);border-left:1px solid #3B4857}
.math h3{font:500 13px/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase;margin-bottom:12px}
.math .col:first-child h3{color:#F0B79A}
.math .col+.col h3{color:#9FD3B4}
.math ol{list-style:none;padding:0;margin:0}
.math li{display:flex;justify-content:space-between;gap:16px;padding:14px 0;border-top:1px solid #3B4857}
.math li span{color:var(--soft-dk);font-size:17px}
.math li b{font:500 22px/1.25 var(--serif);text-align:right;white-space:nowrap}
.bottom-line{display:grid;grid-template-columns:1fr auto 1fr;gap:24px;align-items:center;margin-top:28px;padding:28px;border:1px solid #3B4857;border-radius:6px}
.bottom-line div{text-align:center}
.bottom-line b{display:block;font:500 clamp(36px,5vw,56px)/1 var(--serif)}
.bottom-line .bad b{color:#F0B79A}
.bottom-line .good b{color:#9FD3B4}
.bottom-line span{color:var(--soft-dk);font-size:16px}
.bottom-line .vs{font:italic 500 24px var(--serif);color:var(--soft-dk)}
.source{color:var(--soft-dk);font-size:15px;margin-top:16px}
.prevent{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:56px}
.prevent article{border:1px solid #3B4857;border-radius:6px;padding:22px}
.prevent h3{font-size:22px;margin-bottom:10px}
.prevent p{color:var(--soft-dk);font-size:16px;margin:0}

/* chapters */
.chapters{display:grid;grid-template-columns:1fr 1fr;gap:0 48px;list-style:none;padding:0;margin:0}
.chapters li{display:grid;grid-template-columns:48px 1fr;gap:4px 12px;padding:18px 0;border-top:1px solid var(--rule)}
.chapters .n{font:500 26px/1.1 var(--serif);color:var(--accent)}
.chapters b{font-weight:600}
.chapters span.d{grid-column:2;color:var(--soft);font-size:16px}
.pages{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:56px}
.pages figure{margin:0}
.pages img{border:1px solid var(--rule);border-radius:3px;box-shadow:0 10px 24px rgba(31,42,54,.1);background:#fff}
.pages figcaption{font-size:15px;color:var(--soft);margin-top:10px}

/* method */
.method{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.method article{background:#fff;border:1px solid var(--rule);border-radius:6px;padding:30px 26px;border-top:4px solid var(--accent)}
.method .mono{color:var(--accent-dk)}
.method h3{font-size:28px;margin:10px 0 12px}
.method p{color:#3A4450;margin:0}

/* fit */
.fit{display:grid;grid-template-columns:1fr 1fr;gap:48px}
.fit h3{font-size:26px;margin-bottom:12px}
.fit ul{list-style:none;padding:0;margin:0}
.fit li{display:flex;gap:12px;padding:12px 0;border-top:1px solid var(--rule)}
.fit svg{flex:none;width:22px;height:22px;margin-top:4px}
.fit .yes svg{color:#2F7A52}
.fit .no svg{color:var(--accent-dk)}
.pull{margin:64px auto 0;max-width:820px;text-align:center;font:italic 500 clamp(26px,3.2vw,38px)/1.3 var(--serif)}
.pull cite{display:block;font:500 13px/1.4 var(--mono);letter-spacing:.12em;text-transform:uppercase;font-style:normal;color:var(--soft);margin-top:16px}

/* shelf */
.shelf{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,360px));gap:24px}
.card{display:flex;flex-direction:column;background:#fff;border:1px solid var(--rule);border-radius:6px;overflow:hidden}
.card .img{position:relative;background:var(--cream);aspect-ratio:4/5;display:flex;align-items:center;justify-content:center;padding:20px}
.card .img img{max-height:100%;width:auto}
.card .tag{position:absolute;top:14px;left:14px;background:var(--ink);color:#fff;padding:5px 10px;border-radius:3px}
.card .body{padding:22px;display:flex;flex-direction:column;gap:8px;flex:1}
.card h3{font-size:24px}
.card p{color:var(--soft);font-size:16px;margin:0}
.card .row{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-top:auto;padding-top:14px}
.card .row b{font:500 28px/1 var(--serif)}
.card .btn{min-height:48px;padding:12px 18px;font-size:16px}

/* faq */
.faq{max-width:860px}
details{border-top:1px solid var(--rule)}
details:last-child{border-bottom:1px solid var(--rule)}
summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:20px;padding:22px 0;min-height:44px;font:500 22px/1.35 var(--serif)}
summary::-webkit-details-marker{display:none}
summary .pm{flex:none;width:28px;height:28px;border:1px solid var(--ink);border-radius:50%;position:relative}
summary .pm::before,summary .pm::after{content:"";position:absolute;left:50%;top:50%;width:12px;height:2px;background:var(--ink);transform:translate(-50%,-50%)}
summary .pm::after{transform:translate(-50%,-50%) rotate(90deg);transition:transform .2s}
details[open] summary .pm::after{transform:translate(-50%,-50%) rotate(0)}
details .ans{padding:0 48px 22px 0;color:#3A4450}

/* final */
.final{text-align:center;padding:104px 0 72px}
.final h2{font-size:clamp(36px,5vw,60px);max-width:16em;margin:0 auto}
.final .sub{color:var(--soft-dk);margin:20px auto 40px;max-width:34em}
.buybox{max-width:520px;margin:0 auto;border:1px solid #3B4857;border-radius:8px;padding:32px;background:var(--ink-2)}
.buybox .price{justify-content:center;margin:0 0 20px}
.buybox .price span{color:var(--soft-dk)}
.buybox .btn{width:100%}
.badge{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:18px;color:var(--soft-dk);font-size:16px}
.badge svg{width:24px;height:24px;color:#9FD3B4}
footer{border-top:1px solid #3B4857;margin-top:88px;padding-top:32px;color:var(--soft-dk);font-size:15px;text-align:left}
footer .wrap{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap}
footer p{max-width:46em;margin:0}

/* phones */
@media (max-width:900px){
  body{font-size:18px}
  .hero{padding:44px 0 56px}
  .hero .wrap,.product,.fit,.math{grid-template-columns:1fr}
  .hero .wrap{gap:48px}
  .portrait{max-width:440px}
  .portrait{margin:0 20px 24px 0}
  .portrait::before{inset:20px -16px -16px 20px}
  .quote-card{position:relative;left:auto;bottom:auto;margin:-56px 12px 0 16px;max-width:none}
  .home-hero .wrap{grid-template-columns:1fr;gap:56px}
  .home-hero{padding:48px 0 64px}
  .wide-photo{margin-left:16px}
  .pillars{grid-template-columns:1fr 1fr}
  .nav ul a{padding:0 10px}
  .math .col+.col{border-left:0;border-top:1px solid #3B4857}
  .prevent{grid-template-columns:1fr 1fr}
  .chapters{grid-template-columns:1fr}
  .pages{grid-template-columns:1fr 1fr}
  .method{grid-template-columns:1fr}
  .cover{max-width:360px;transform:none}
  .cover-3d{max-width:320px;margin:0 auto}
  section{padding:72px 0}
  .sec-head{grid-template-columns:1fr}
  .sec-head h2,.sec-head p{grid-column:1}
  .sec-num{font-size:56px}
}
@media (max-width:560px){
  .topbar .aud{display:none}
  .stats b{font-size:28px}
  .prevent{grid-template-columns:1fr}
  .bottom-line{grid-template-columns:1fr}
  .math .col{padding:22px 18px 4px}
  .math li{flex-direction:column;gap:2px}
  .math li b{text-align:left;white-space:normal}
  .ctas .btn{width:100%}
  details .ans{padding-right:0}
  .buybox{padding:24px 18px}
  .pillars{grid-template-columns:1fr}
  .brand span{display:none}
}