:root{--bg:#f5f2ff;--surface:#fff;--surface2:#ede7ff;--ink:#29233c;--muted:#6d6880;--primary:#6c48dc;--primary2:#8d73ea;--cyan:#17b8c8;--pink:#ff8bc1;--green:#47c995;--shadow:0 14px 34px rgba(72,45,134,.14);--soft:inset 1px 1px 0 rgba(255,255,255,.9),0 7px 18px rgba(69,42,127,.12);--radius:26px;--max:1140px}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:radial-gradient(circle at 10% 0,#e9fafa 0,transparent 30%),radial-gradient(circle at 90% 10%,#fbe8f4 0,transparent 28%),var(--bg);color:var(--ink);font-family:Inter,ui-rounded,"Nunito Sans",system-ui,-apple-system,sans-serif;line-height:1.55;min-height:100vh}.topbar{height:76px;position:sticky;top:0;z-index:30;display:flex;align-items:center;gap:14px;padding:10px max(18px,calc((100vw - var(--max))/2));background:color-mix(in srgb,var(--bg) 86%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid rgba(108,72,220,.08)}.brand{display:flex;align-items:center;gap:10px;color:var(--primary);font-weight:900;letter-spacing:.03em;text-decoration:none;margin-right:auto}.brand small{display:block;font-size:.62rem;color:var(--muted);letter-spacing:.15em}.brand-mark{display:grid;place-items:center;width:44px;height:44px;border-radius:16px;background:linear-gradient(145deg,#886bea,#5938c2);color:#fff;font-size:1.35rem;box-shadow:var(--soft)}.top-actions{display:flex;gap:8px}.icon-btn{border:0;background:var(--surface);color:var(--primary);width:44px;height:44px;border-radius:15px;font-size:1.25rem;cursor:pointer;box-shadow:var(--soft)}.hidden{visibility:hidden}.drawer{position:fixed;z-index:50;right:0;top:0;width:min(360px,90vw);height:100dvh;padding:20px;background:var(--surface);transform:translateX(105%);transition:.25s;box-shadow:-20px 0 50px rgba(35,23,70,.18);overflow:auto}.drawer.open{transform:none}.drawer-head{display:flex;justify-content:space-between;align-items:center;font-size:1.3rem;margin-bottom:18px}.drawer nav{display:grid;gap:10px}.drawer a{padding:15px;border-radius:18px;background:var(--surface2);color:var(--ink);text-decoration:none;font-weight:750}.drawer a.active{background:var(--primary);color:#fff}.scrim{position:fixed;inset:0;z-index:40;background:rgba(23,16,44,.35);opacity:0;pointer-events:none;transition:.25s}.scrim.on{opacity:1;pointer-events:auto}.offline-badge{display:flex;align-items:center;gap:8px;margin-top:28px;padding:12px 14px;border-radius:16px;background:var(--bg);font-size:.85rem;color:var(--muted)}#netDot{width:10px;height:10px;border-radius:50%;background:var(--green)}main{max-width:var(--max);margin:auto;padding:28px 20px 80px}.hero{display:grid;grid-template-columns:1.45fr .7fr;gap:24px;align-items:stretch}.hero-copy,.hero-art{border-radius:34px;background:var(--surface);box-shadow:var(--shadow);padding:clamp(26px,5vw,56px)}.eyebrow{display:inline-flex;padding:8px 13px;border-radius:99px;background:#ddf8f3;color:#167f71;font-size:.78rem;font-weight:900;letter-spacing:.08em}.hero h1{font-size:clamp(2.2rem,5vw,4.6rem);line-height:.98;margin:20px 0 16px;letter-spacing:-.05em}.hero h1 span{color:var(--primary)}.hero p{font-size:1.05rem;color:var(--muted);max-width:660px}.hero-art{display:grid;place-items:center;text-align:center;background:linear-gradient(150deg,#7e5ae3,#5a35c7);color:#fff;overflow:hidden;position:relative}.clay-book{font-size:6rem;filter:drop-shadow(0 16px 13px rgba(35,16,79,.28));transform:rotate(-7deg)}.hero-art b{font-size:1.35rem}.progress-wrap{margin-top:28px}.progress-meta{display:flex;justify-content:space-between;font-size:.86rem;font-weight:800}.progress{height:12px;border-radius:99px;background:#e6e0f5;overflow:hidden;margin-top:8px}.progress i{display:block;height:100%;background:linear-gradient(90deg,var(--cyan),var(--primary));border-radius:inherit}.section-title{margin:44px 0 8px;font-size:1.8rem}.section-lead{color:var(--muted);margin-top:0}.chapter-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:20px}.chapter-card{background:var(--surface);border-radius:var(--radius);padding:24px;box-shadow:var(--soft);display:flex;flex-direction:column;min-height:255px;border:2px solid transparent}.chapter-card:hover{border-color:#c9bbfa;transform:translateY(-2px)}.chapter-no{width:52px;height:52px;border-radius:18px;display:grid;place-items:center;background:var(--surface2);color:var(--primary);font-size:1.25rem;font-weight:950}.chapter-card h3{font-size:1.35rem;margin:18px 0 6px}.chapter-card p{color:var(--muted);margin:0 0 20px}.open-btn{margin-top:auto;display:flex;justify-content:space-between;align-items:center;padding:13px 16px;border:0;border-radius:16px;background:var(--primary);color:#fff;font-weight:850;text-decoration:none}.reader{max-width:900px;margin:auto}.reader-head{padding:clamp(24px,5vw,48px);border-radius:34px;background:linear-gradient(145deg,#6844d8,#8064e1);color:#fff;box-shadow:var(--shadow)}.reader-head .eyebrow{background:rgba(255,255,255,.18);color:#fff}.reader-head h1{font-size:clamp(2.1rem,6vw,4rem);line-height:1.03;margin:16px 0 8px;letter-spacing:-.04em}.reader-head p{margin:0;color:#eee9ff}.reader-tools{display:flex;gap:9px;flex-wrap:wrap;margin-top:22px}.reader-tools button{border:0;border-radius:13px;padding:10px 14px;background:rgba(255,255,255,.17);color:#fff;font-weight:800;cursor:pointer}.toc{margin:22px 0;padding:20px;border-radius:24px;background:var(--surface);box-shadow:var(--soft)}.toc summary{font-weight:900;cursor:pointer}.toc nav{display:grid;grid-template-columns:repeat(2,1fr);gap:8px;margin-top:14px}.toc a{color:var(--primary);text-decoration:none;padding:8px;border-radius:10px;background:var(--surface2);font-size:.9rem}.content-section{scroll-margin-top:95px;margin:38px 0}.content-section h2{font-size:clamp(1.55rem,4vw,2.2rem);line-height:1.15;color:var(--primary);margin-bottom:18px}.term-card{margin:12px 0;padding:17px 19px;border-radius:20px;background:var(--surface);box-shadow:var(--soft);border-left:5px solid var(--primary2);font-size:1rem}.term-card b{color:var(--primary)}.note{margin:16px 0;padding:18px 20px;border-radius:20px;background:#dcf7ec;border-left:5px solid var(--green);font-weight:650}.subheading{margin:24px 0 8px;color:var(--cyan);font-size:1.25rem}.bullet{padding:12px 16px 12px 42px;position:relative;background:var(--surface);border-radius:16px;margin:8px 0}.bullet:before{content:'✓';position:absolute;left:17px;color:var(--green);font-weight:900}.table-scroll{overflow:auto;border-radius:20px;box-shadow:var(--soft);margin:18px 0}table{border-collapse:collapse;width:100%;min-width:600px;background:var(--surface)}th{background:var(--primary);color:#fff;text-align:left}th,td{padding:14px;border-bottom:1px solid #e8e3f4;vertical-align:top}.next-card{margin-top:48px;padding:24px;border-radius:26px;background:var(--surface);box-shadow:var(--shadow);display:flex;align-items:center;justify-content:space-between;gap:18px}.next-card a{background:var(--primary);color:#fff;text-decoration:none;padding:12px 16px;border-radius:15px;font-weight:850}.to-top{position:fixed;right:20px;bottom:20px;width:48px;height:48px;border:0;border-radius:17px;background:var(--primary);color:#fff;box-shadow:var(--shadow);font-size:1.2rem;opacity:0;pointer-events:none;transition:.2s}.to-top.show{opacity:1;pointer-events:auto}body.dark{--bg:#171422;--surface:#242033;--surface2:#332b4b;--ink:#f7f4ff;--muted:#bbb4ce;--shadow:0 14px 34px rgba(0,0,0,.28);--soft:inset 1px 1px 0 rgba(255,255,255,.05),0 7px 18px rgba(0,0,0,.22)}
@media(max-width:760px){.topbar{height:66px}.brand small{display:none}.hero{grid-template-columns:1fr}.hero-art{min-height:210px}.chapter-grid{grid-template-columns:1fr}.toc nav{grid-template-columns:1fr}main{padding:18px 14px 70px}.reader-head{border-radius:25px}.content-section{margin:30px 0}.term-card{font-size:1.03rem;padding:17px}.next-card{align-items:flex-start;flex-direction:column}}@media print{.topbar,.drawer,.scrim,.reader-tools,.to-top,.next-card,.toc{display:none!important}body{background:#fff}.reader{max-width:none}.reader-head{background:#fff!important;color:#281f3c;padding:0;box-shadow:none}.reader-head p{color:#555}.content-section{break-before:auto}.term-card,.note{box-shadow:none;border:1px solid #ddd;break-inside:avoid}main{padding:0}}