:root{color-scheme:light;--ink:#172230;--muted:#566373;--line:#dce3e8;--paper:#f7f9f8;--blue:#1956d8;--soft-blue:#e9f0ff;--green:#146a57;--gold:#d58b25;--radius:22px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:#fff;color:var(--ink);font:17px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
a{color:inherit;text-underline-offset:4px}
a:hover{color:var(--blue)}
a:focus-visible,summary:focus-visible{outline:3px solid var(--blue);outline-offset:4px;border-radius:3px}
img,svg{max-width:100%}
img{display:block}
.container{width:min(1160px,calc(100% - 48px));margin-inline:auto}
.skip{position:absolute;left:-9999px;top:12px;padding:10px 14px;background:#fff;z-index:10}
.skip:focus{left:12px}
.site-header{border-bottom:1px solid var(--line);background:#fff}
.header-inner{display:flex;justify-content:space-between;align-items:center;gap:24px;min-height:76px}
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;font-weight:740;letter-spacing:-.03em;white-space:nowrap}
.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:11px;background:var(--ink);color:white;font-size:13px;letter-spacing:-.08em}
.site-nav{display:flex;align-items:center;gap:28px;font-size:14px;font-weight:650}
.site-nav a{text-decoration:none}
.site-nav a[aria-current="page"]{color:var(--blue)}
.eyebrow{margin:0 0 16px;color:var(--blue);font-size:12px;font-weight:800;letter-spacing:.15em;text-transform:uppercase}
h1,h2,h3,p{margin-top:0}
h1,h2{font-family:Georgia,"Times New Roman",serif;letter-spacing:-.055em;line-height:1.07;font-weight:500}
h1{font-size:clamp(49px,7.4vw,88px)}
h2{font-size:clamp(36px,5vw,58px)}
h3{font-size:24px;line-height:1.2;letter-spacing:-.035em}
.lead{font-size:clamp(18px,2vw,22px);line-height:1.55;color:var(--muted);max-width:650px}
.muted{color:var(--muted)}
.small{font-size:13px;color:var(--muted)}
.button{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:12px 21px;border:1px solid var(--line);border-radius:999px;background:#fff;text-decoration:none;font-size:14px;font-weight:750;line-height:1.25;transition:transform .2s,border-color .2s,background-color .2s}
.button:hover{transform:translateY(-2px);border-color:var(--blue);color:var(--blue)}
.button.primary{background:var(--blue);border-color:var(--blue);color:#fff}
.button.primary:hover{background:#1246b6;color:#fff}
.button-group{display:flex;flex-wrap:wrap;gap:12px;margin-top:30px}
.hero{position:relative;overflow:hidden;background:linear-gradient(130deg,#f6f9ff 0%,#fff 68%);border-bottom:1px solid var(--line)}
.hero-grid{display:grid;grid-template-columns:minmax(0,1.05fr) minmax(310px,.95fr);align-items:center;gap:64px;min-height:570px;padding-block:92px}
.hero h1{max-width:720px;margin-bottom:24px}
.hero-visual{position:relative;min-height:360px;display:grid;place-items:center}
.hero-visual svg{width:100%;max-width:500px;filter:drop-shadow(0 22px 46px #8da5d136)}
.visual-label{position:absolute;bottom:0;right:0;background:#fff;border:1px solid var(--line);border-radius:14px;padding:12px 16px;font-size:13px;font-weight:700;box-shadow:0 12px 30px #193b5c12}
.section{padding-block:92px}
.section-head{display:flex;justify-content:space-between;align-items:end;gap:32px;margin-bottom:34px}
.section-head h2{margin-bottom:0}
.text-link{font-size:14px;font-weight:750;color:var(--blue)}
.feature{display:grid;grid-template-columns:minmax(250px,.72fr) minmax(0,1.28fr);gap:56px;align-items:center;border:1px solid var(--line);border-radius:var(--radius);padding:44px;background:var(--paper)}
.cover-frame{max-width:320px;margin:auto;padding:11px;border-radius:10px;background:#fff;box-shadow:0 28px 45px #1c31522a;transform:rotate(-2deg)}
.cover-frame img{width:100%;height:auto;border-radius:3px}
.feature h3{font-family:Georgia,"Times New Roman",serif;font-size:clamp(32px,4vw,50px);font-weight:500;line-height:1.1}
.feature p{max-width:570px;color:var(--muted)}
.pill{display:inline-block;margin-bottom:18px;padding:6px 11px;border:1px solid #bfd6ca;border-radius:999px;color:var(--green);background:#f4fbf7;font-size:11px;font-weight:800;letter-spacing:.1em;text-transform:uppercase}
.divider{border-top:1px solid var(--line)}
.three-up{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
.step{border:1px solid var(--line);border-radius:18px;padding:26px;background:#fff}
.step-number{display:inline-grid;place-items:center;width:32px;height:32px;margin-bottom:22px;border-radius:50%;background:var(--soft-blue);color:var(--blue);font:800 12px/1 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.step h3{font-size:19px}
.step p{margin-bottom:0;color:var(--muted);font-size:15px}
.about{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center}
.about p{max-width:520px;color:var(--muted)}
.about-card{position:relative;overflow:hidden;min-height:280px;padding:32px;border:1px solid var(--line);border-radius:var(--radius);background:#f5f8fd}
.about-card .quote{position:relative;z-index:1;max-width:365px;font-family:Georgia,"Times New Roman",serif;font-size:clamp(24px,3vw,34px);letter-spacing:-.04em;line-height:1.25}
.about-card .mini-graph{position:absolute;right:-30px;bottom:-80px;width:260px;opacity:.45}
.site-footer{border-top:1px solid var(--line);padding-block:34px;color:var(--muted);font-size:13px}
.footer-inner{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.page-intro{padding-block:90px 52px;max-width:850px}
.page-intro h1{margin-bottom:24px}
.book-list{padding-bottom:96px}
.archive-card{display:grid;grid-template-columns:80px 1fr;gap:22px;align-items:center;margin-top:22px;padding:28px;border:1px solid var(--line);border-radius:var(--radius)}
.archive-art{display:grid;place-items:center;width:80px;height:96px;border-radius:7px;background:linear-gradient(145deg,#f2e8ff,#d5e4ff);color:#6541b6;font:700 31px Georgia,serif}
.archive-card h3{margin-bottom:6px;font-size:21px}
.archive-card p{margin-bottom:0;font-size:14px;color:var(--muted)}
.breadcrumb{padding-top:30px;color:var(--muted);font-size:13px}
.breadcrumb a{color:var(--blue)}
.book-hero{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(260px,.8fr);gap:75px;align-items:center;padding-block:70px 100px}
.book-hero h1{font-size:clamp(48px,6.4vw,78px)}
.book-hero .cover-frame{max-width:380px;transform:rotate(2deg)}
.book-hero .subtitle{margin-bottom:20px;color:var(--blue);font-size:22px;font-weight:700;line-height:1.4}
.store-strip{display:flex;flex-wrap:wrap;gap:11px;margin-top:22px}
.store-strip .button{min-height:44px;padding:9px 15px}
.prose{max-width:770px}
.prose p,.prose li{color:var(--muted)}
.prose h3{margin-top:28px}
.diagram{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-top:34px}
.diagram-step{position:relative;padding:22px 17px;border:1px solid var(--line);border-radius:14px;background:#fff}
.diagram-step:not(:last-child):after{content:"→";position:absolute;right:-15px;top:42%;z-index:1;display:grid;place-items:center;width:22px;height:22px;border-radius:50%;background:var(--blue);color:#fff;font-size:14px}
.diagram-step b{display:block;margin-bottom:7px;font-size:15px}
.diagram-step span{display:block;color:var(--muted);font-size:13px}
.faq{max-width:780px}
.faq details{padding:19px 0;border-bottom:1px solid var(--line)}
.faq summary{cursor:pointer;font-weight:700}
.faq p{margin:12px 0 0;color:var(--muted)}
.cta-band{padding:38px;border:1px solid var(--line);border-radius:var(--radius);background:linear-gradient(110deg,#f1f6ff,#fff)}
.cta-band h2{font-size:clamp(31px,4vw,45px);margin-bottom:14px}
@media(max-width:820px){.hero-grid,.feature,.about,.book-hero{grid-template-columns:1fr}.hero-grid{gap:15px;padding-block:64px}.hero-visual{min-height:220px}.hero-visual svg{max-width:330px}.feature{gap:38px}.feature .cover-frame{max-width:250px}.book-hero{gap:38px}.book-hero .cover-frame{max-width:260px}.three-up{grid-template-columns:1fr}.diagram{grid-template-columns:repeat(2,minmax(0,1fr))}.diagram-step:nth-child(2):after{display:none}}
@media(max-width:520px){.container{width:min(100% - 32px,1160px)}.header-inner{min-height:68px}.brand{font-size:14px}.site-nav{gap:14px;font-size:13px}.site-nav .external{display:none}.hero-grid{padding-block:52px}.hero-visual{min-height:190px}.hero-visual svg{max-width:260px}.visual-label{font-size:11px}.section{padding-block:65px}.feature{padding:25px}.page-intro{padding-block:58px 35px}.book-hero{padding-block:48px 70px}.diagram{grid-template-columns:1fr}.diagram-step:after{display:none}.archive-card{grid-template-columns:60px 1fr;padding:20px}.archive-art{width:60px;height:80px}.cta-band{padding:26px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.button{transition:none}}