:root{--bg:#f7f7fb;--surface:#fff;--surface2:#f0efff;--text:#171923;--muted:#697386;--line:#e5e7eb;--brand:#5b4fe8;--brand2:#8b5cf6;--dark:#171a2b;--shadow:0 18px 50px rgba(31,35,65,.10);--radius:22px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.65}a{color:inherit;text-decoration:none}.container{width:min(1160px,92%);margin:auto}.nav{position:sticky;top:0;z-index:50;background:rgba(247,247,251,.92);backdrop-filter:blur(18px);border-bottom:1px solid rgba(229,231,235,.88)}.nav-inner{height:74px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{display:flex;align-items:center;gap:10px;font-weight:900;font-size:1.32rem;letter-spacing:-.035em}.brandmark{width:34px;height:34px;border-radius:11px;background:linear-gradient(140deg,var(--brand),var(--brand2));display:grid;place-items:center;color:#fff;font-weight:950;box-shadow:0 8px 22px rgba(91,79,232,.22)}.nav-links{display:flex;gap:24px;font-size:.94rem;color:#3f4552}.nav-links a:hover{color:var(--brand)}.nav-actions{display:flex;gap:10px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:11px 16px;border-radius:12px;border:1px solid var(--line);background:#fff;font-weight:800;cursor:pointer}.btn.primary{background:linear-gradient(135deg,var(--brand),var(--brand2));color:#fff;border:none}.hero{padding:88px 0 50px}.hero-grid{display:grid;grid-template-columns:1.18fr .82fr;gap:52px;align-items:center}.eyebrow{display:inline-flex;padding:7px 11px;border-radius:999px;background:#ecebff;color:#4b42bf;font-weight:850;font-size:.76rem;letter-spacing:.05em;text-transform:uppercase}.hero h1{font-size:clamp(3rem,6.6vw,5.75rem);line-height:.94;letter-spacing:-.07em;margin:18px 0 22px;max-width:800px}.hero p{font-size:1.16rem;color:var(--muted);max-width:720px}.hero-card{background:linear-gradient(155deg,#171a2b,#302b6d 58%,#6f4de5);color:#fff;border-radius:30px;padding:30px;box-shadow:0 30px 80px rgba(46,40,112,.28)}.hero-card h3{font-size:2rem;line-height:1.1;margin:10px 0}.hero-card small{color:#d4d4ff}.mini-list{display:grid;gap:11px;margin-top:22px}.mini-item{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.13);padding:14px;border-radius:15px}.searchbox{display:flex;background:#fff;padding:8px;border:1px solid var(--line);border-radius:17px;box-shadow:var(--shadow);margin-top:28px;max-width:760px}.searchbox input{flex:1;border:0;outline:0;font-size:1rem;padding:12px 14px;background:transparent}.searchbox button{border:0;border-radius:12px;padding:0 20px;background:var(--dark);color:#fff;font-weight:850}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px;max-width:680px}.stat{padding:12px 14px;background:rgba(255,255,255,.7);border:1px solid var(--line);border-radius:14px}.stat strong{display:block;font-size:1.15rem}.stat span{font-size:.82rem;color:var(--muted)}.section{padding:62px 0}.section.alt{background:#fff}.section-head{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:26px}.section-head h2{font-size:2.15rem;letter-spacing:-.045em;margin:0}.section-head p{margin:6px 0 0;color:var(--muted)}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.book-card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:0 8px 28px rgba(17,24,39,.04);transition:.22s;display:flex;flex-direction:column;min-height:285px}.book-card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#d8d5ff}.cover{height:120px;border-radius:17px;background:linear-gradient(145deg,#ecebff,#fbfaff);border:1px solid #dfddff;display:flex;align-items:flex-end;padding:16px;margin-bottom:18px;overflow:hidden;position:relative}.cover:after{content:"";position:absolute;width:110px;height:110px;border:18px solid rgba(91,79,232,.10);border-radius:50%;right:-22px;top:-32px}.cover strong{font-size:1.08rem;max-width:76%;position:relative;z-index:1}.tag{display:inline-flex;width:max-content;background:#f1f2f5;border-radius:999px;padding:5px 9px;font-size:.73rem;font-weight:850;color:#50586a}.book-card h3{font-size:1.24rem;margin:13px 0 3px}.meta{color:var(--muted);font-size:.9rem}.book-card p{color:#555d6d;font-size:.94rem}.readlink{margin-top:auto;font-weight:850;color:var(--brand)}.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}.feature{background:#fff;border:1px solid var(--line);border-radius:19px;padding:21px}.feature .icon{font-size:1.5rem}.feature h3{margin:10px 0 5px}.feature p{color:var(--muted);font-size:.93rem}.category-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.category-card{border-radius:25px;padding:30px;min-height:210px;display:flex;flex-direction:column;justify-content:end;background:#191c31;color:#fff}.category-card.light{background:linear-gradient(140deg,#eeecff,#fff);color:var(--text);border:1px solid #ddd9ff}.category-card h3{font-size:1.8rem;margin:8px 0}.category-card p{max-width:520px;margin:0 0 16px;color:#cbd0dd}.category-card.light p{color:var(--muted)}.cta{background:var(--dark);color:#fff;border-radius:30px;padding:42px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:28px}.cta p{color:#cdd2dd}.footer{padding:42px 0 52px;color:var(--muted)}.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:28px}.footer h4{color:var(--text);margin:0 0 10px}.footer a{display:block;margin:7px 0}.book-hero{padding:58px 0 30px}.book-hero-grid{display:grid;grid-template-columns:1fr 325px;gap:36px}.book-hero h1{font-size:clamp(2.7rem,5vw,4.7rem);line-height:.96;letter-spacing:-.06em;margin:16px 0}.book-hero p{font-size:1.06rem;color:var(--muted)}.toc{background:#fff;border:1px solid var(--line);border-radius:18px;padding:18px;height:max-content;position:sticky;top:98px}.toc a{display:block;padding:8px 6px;color:#4b5563}.article{background:#fff;border:1px solid var(--line);border-radius:24px;padding:38px;box-shadow:0 8px 30px rgba(20,24,40,.04)}.article h2{margin-top:38px;font-size:1.75rem;letter-spacing:-.035em}.article h3{margin-top:25px}.callout{border-left:4px solid var(--brand);background:#f5f4ff;padding:16px 18px;border-radius:0 14px 14px 0}.pill-row{display:flex;flex-wrap:wrap;gap:8px}.pill{padding:7px 10px;border-radius:999px;background:#f1f2f5;font-size:.83rem;font-weight:750}.quiz{margin-top:22px}.q{border:1px solid var(--line);border-radius:16px;padding:18px;margin:14px 0}.q label{display:block;padding:6px 0}.quiz-result{margin-top:16px;font-weight:850}.page{padding:58px 0}.page article{max-width:840px;margin:auto;background:#fff;border:1px solid var(--line);border-radius:24px;padding:38px}.page h1{font-size:2.8rem;letter-spacing:-.05em}.notice{font-size:.9rem;color:var(--muted)}.empty{grid-column:1/-1;background:#fff;border:1px dashed #d8dbe3;border-radius:18px;padding:24px;color:var(--muted)}.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}.filter{padding:8px 12px;border:1px solid var(--line);background:#fff;border-radius:999px;cursor:pointer;font-weight:750}.filter.active{background:var(--dark);color:#fff;border-color:var(--dark)}@media(max-width:920px){.hero-grid,.book-hero-grid,.cta{grid-template-columns:1fr}.grid{grid-template-columns:repeat(2,1fr)}.feature-grid{grid-template-columns:repeat(2,1fr)}.toc{position:static}.nav-links{display:none}.footer-grid{grid-template-columns:1fr 1fr}.hero{padding-top:58px}}@media(max-width:640px){.grid,.feature-grid,.footer-grid,.category-grid,.stats{grid-template-columns:1fr}.nav-actions .btn:not(.primary){display:none}.hero h1{font-size:3.25rem}.article,.page article{padding:23px}.searchbox{flex-direction:column}.searchbox button{padding:13px}.cta{padding:29px}}

.breadcrumbs{display:flex;flex-wrap:wrap;gap:7px;align-items:center;font-size:.88rem;color:var(--muted);margin:18px 0 4px}.breadcrumbs a{color:var(--brand);font-weight:750}.breadcrumbs span.sep{color:#a3a8b3}.related{margin-top:34px}.related h2{margin-bottom:16px}.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.related-card{display:block;border:1px solid var(--line);background:#fafaff;border-radius:16px;padding:16px;transition:.2s}.related-card:hover{transform:translateY(-2px);border-color:#cbc7ff}.related-card strong{display:block;margin-bottom:4px}.related-card span{font-size:.86rem;color:var(--muted)}@media(max-width:760px){.related-grid{grid-template-columns:1fr}}