:root{color-scheme:light;--ink:#172640;--muted:#53627a;--navy:#172b52;--blue:#274fa6;--paper:#fff;--bg:#f1f4fa;--line:#dbe2ee;--tint:#e8eefc;font-family:Inter,'Segoe UI',system-ui,sans-serif;color:var(--ink);background:var(--bg)}
*,*::before,*::after{box-sizing:border-box}body{margin:0}a{color:var(--blue);text-underline-offset:.2em}a:hover{color:#142e6c}a:focus-visible,summary:focus-visible,input:focus-visible,[tabindex]:focus-visible{outline:3px solid #6489ed;outline-offset:3px}button,input{font:inherit}[hidden]{display:none!important}.skip{position:fixed;top:-4rem;left:1rem;padding:.8rem;background:white;z-index:3}.skip:focus{top:1rem}
.top{background:#fff;border-bottom:1px solid var(--line)}.top-inner{max-width:1280px;margin:auto;padding:16px 32px;display:flex;justify-content:space-between;align-items:center}.brand,.catalog-link{font-weight:700;text-decoration:none;color:var(--navy)}.brand{display:flex;align-items:center;gap:9px;font-size:1.13rem}.brand span{background:var(--navy);color:white;border-radius:9px;display:grid;place-items:center;width:34px;height:34px;font-family:Georgia,serif;font-size:1.4rem}.catalog-link{font-size:.88rem}.catalog-link span{padding-left:5px}.layout{max-width:1280px;margin:0 auto;padding:28px 32px;display:flex;align-items:flex-start;gap:24px}.catalog,.reader{width:100%;min-width:0}.footer{max-width:1280px;padding:8px 32px 28px;margin:auto;color:var(--muted);font-size:.83rem}
.hero{display:grid;grid-template-columns:1.4fr 1fr;overflow:hidden;background:var(--navy);color:#fff;border-radius:20px;padding:50px clamp(24px,5vw,70px);min-height:335px;align-items:center}.eyebrow{font-size:.77rem;letter-spacing:.11em;text-transform:uppercase;font-weight:750;margin:0 0 12px;color:var(--blue)}.hero .eyebrow{color:#aebff1}.hero h1,.topic-head h1{font-family:Georgia,'Times New Roman',serif;font-weight:500;letter-spacing:-.025em;line-height:1.06;margin:0}.hero h1{font-size:clamp(2.6rem,6vw,5.35rem)}.hero p:not(.eyebrow){color:#d8e1fa;line-height:1.6;max-width:31rem;margin:18px 0 24px}.button{display:inline-flex;align-items:center;gap:16px;border-radius:9px;background:#e5edff;color:#172b52;padding:12px 17px;font-weight:700;text-decoration:none}.button:hover{background:white}.hero-art{display:grid;place-content:center;justify-items:center;min-height:240px;background:radial-gradient(circle,#3d5f9d 0,transparent 67%),repeating-linear-gradient(0deg,transparent 0 29px,#ffffff12 30px),repeating-linear-gradient(90deg,transparent 0 29px,#ffffff12 30px);mask-image:linear-gradient(90deg,transparent,#000 15%)}.hero-art span:first-child{font:clamp(7rem,15vw,13rem)/.95 Georgia,serif;color:#e2ebff}.hero-art span:last-child{font-size:.85rem;letter-spacing:.13em;color:#d1dcf8;padding-top:20px}
.index-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:32px 0 16px}.index-head h2{margin:0;font:2.1rem Georgia,serif}.search{font-size:.8rem;font-weight:700;color:var(--muted);display:grid;gap:5px}.search input{width:min(100%,265px);padding:9px 12px;border:1px solid #aebbd0;border-radius:8px;background:#fff;color:var(--ink)}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;align-items:start}.section-card,.menu,.reader{background:var(--paper);border:1px solid var(--line);border-radius:14px}.section-card{padding:18px}.section-card h3{font:1.45rem Georgia,serif;margin:0 0 11px}.section-card ul,.menu ul{list-style:none;margin:0;padding:0}.section-card li+li{border-top:1px solid var(--line)}.section-card li a,.menu li a{display:flex;gap:9px;text-decoration:none;color:var(--ink);line-height:1.35;border-radius:7px;padding:9px 7px}.section-card li a:hover,.menu li a:hover,.menu a[aria-current]{background:var(--tint);color:var(--blue)}.num{font-size:.78em;font-weight:750;color:var(--blue);font-variant-numeric:tabular-nums;padding-top:.15em;flex:none}
.menu{position:sticky;top:14px;width:275px;flex:none;max-height:calc(100vh - 28px);overflow:auto;scrollbar-width:thin}.menu summary{cursor:pointer;font-weight:750;padding:15px 16px;border-bottom:1px solid var(--line)}.menu nav{padding:4px 9px 12px}.menu h2{font-size:.73rem;color:var(--muted);margin:13px 7px 3px}.menu li a{font-size:.84rem;padding:6px 7px}.menu a[aria-current]{font-weight:700}.reader{padding:clamp(18px,4vw,54px)}.topic-head h1{font-size:clamp(2.15rem,4.5vw,4rem);max-width:820px;overflow-wrap:anywhere}.prompt{max-width:74ch;line-height:1.55;color:var(--muted);margin:15px 0 20px}.quick{display:flex;flex-wrap:wrap;gap:8px;border-bottom:1px solid var(--line);padding-bottom:19px}.quick a{font-size:.84rem;font-weight:650;background:var(--tint);border-radius:8px;padding:7px 10px;text-decoration:none}.quick a:hover{background:#d8e5ff}.prose{font-size:clamp(1rem,1.45vw,1.12rem);line-height:1.7;overflow-wrap:break-word}.prose h2{font:clamp(1.6rem,3vw,2.2rem) Georgia,serif;color:var(--navy);margin:1.4em 0 .6em;scroll-margin-top:16px}.prose h3{font-size:1.13em;line-height:1.25;margin:1.45em 0 .55em}.prose p{margin:.8em 0}.prose blockquote{margin:1.15em 0;border-left:3px solid #7092e4;border-radius:0 8px 8px 0;padding:1px 14px;background:#f0f4fe}.prose ol,.prose ul{padding-left:1.5em}.prose li{padding-left:.15em;margin:.25em 0}.equation{overflow:auto;padding:4px 10px;margin:.9em 0;background:#f3f6fc;border-radius:8px}.equation .katex-display{margin:.68em 0}.prose figure{margin:12px 0 22px;border:1px solid var(--line);border-radius:10px;padding:14px;background:#f8faff;text-align:center}.prose img{display:block;max-width:100%;max-height:340px;width:auto;height:auto;margin:auto}.prose figcaption{font-size:.83rem;color:var(--muted);margin-top:8px}.paging{display:flex;gap:12px;margin-top:25px;border-top:1px solid var(--line);padding-top:20px}.jump{flex:1;min-width:0;display:grid;align-content:start;gap:5px;border:1px solid var(--line);border-radius:10px;padding:12px;text-decoration:none}.jump:hover{background:var(--tint)}.jump span{font-size:.82rem;color:var(--muted)}.jump strong{line-height:1.35;overflow-wrap:anywhere}.jump.next{text-align:right}.paging .next:only-child{margin-left:auto;flex:0 1 50%}
@media(max-width:920px){.layout{padding:20px;gap:16px}.menu{width:218px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.top-inner,.footer{padding-left:20px;padding-right:20px}}
@media(max-width:700px){.layout{display:block;padding:12px}.menu{width:100%;position:static;max-height:none;margin-bottom:10px}.menu nav{max-height:53vh;overflow:auto}.menu summary{padding:10px 14px}.hero{grid-template-columns:1fr;padding:30px 23px;min-height:0}.hero-art{display:none}.cards{grid-template-columns:1fr}.index-head{align-items:start;flex-direction:column}.search,.search input{width:100%}.top-inner{padding:10px 14px}.footer{padding:4px 14px 20px}.jump strong{font-size:.87rem}.paging .next:only-child{flex:1}}
@media(prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
.prose .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden;padding:3px 0}.prose p,.prose li{overflow-x:auto}