:root{--bg:#f8f7f2;--paper:#fffefa;--ink:#173e3b;--muted:#536966;--line:#d8dfd6;--accent:#c6e5bf;--orange:#e9a65d;--soft:#edf0e8;--hero:#153e3a;--onhero:#f6f6dc;--radius:18px;color-scheme:light}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Arial,Helvetica,sans-serif;line-height:1.65}a{color:inherit}button,input{font:inherit}a,button{touch-action:manipulation}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #e69b43;outline-offset:5px}.skip{position:absolute;top:-80px;left:20px;background:var(--paper);padding:12px;z-index:20}.skip:focus{top:10px}.wrap{max-width:1160px;padding:0 32px;margin:auto}.topbar{display:flex;justify-content:space-between;align-items:center;gap:24px;min-height:94px;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;font-size:19px;font-weight:750;letter-spacing:-.5px}.brand-mark{display:grid;place-items:center;width:38px;height:38px;background:var(--ink);color:var(--bg);border-radius:12px}.brand svg{width:24px;height:24px}nav{display:flex;align-items:center;gap:28px}nav a{font-size:14px;text-decoration:none;color:var(--muted)}nav a[aria-current=page]{color:var(--ink);font-weight:bold}.theme{border:1px solid var(--line);background:transparent;color:var(--ink);border-radius:100px;padding:6px 12px;font-size:12px}.eyebrow{text-transform:uppercase;letter-spacing:2px;font-size:11px;font-weight:750;display:flex;align-items:center;gap:10px}.eyebrow:before{content:'';display:inline-block;width:8px;height:8px;border-radius:100%;background:var(--orange)}.intro{display:flex;justify-content:space-between;align-items:center;padding:28px 0 18px;gap:20px}.small{font-size:12px;color:var(--muted)}.hero{background:var(--hero);color:var(--onhero);border-radius:24px;padding:56px;display:grid;grid-template-columns:1.25fr 1fr;align-items:center;gap:34px;overflow:hidden}.hero h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(44px,5vw,68px);line-height:1.05;letter-spacing:-2px;font-weight:400;margin:20px 0}.hero p{color:#d0ded0;max-width:420px;font-size:16px}.hero .eyebrow{color:#bed5b4}.btn{display:inline-flex;gap:14px;align-items:center;border-radius:100px;background:var(--accent);border:1px solid var(--accent);color:#173e3b;padding:12px 22px;text-decoration:none;font-size:14px;font-weight:700}.btn.secondary{background:transparent;border-color:var(--line);color:var(--ink)}.hero .btn{margin-top:12px}.cloud-map{position:relative;height:310px;display:flex;flex-direction:column;justify-content:center;align-items:center}.map-cloud{border:1px solid #688780;border-radius:40px;display:flex;align-items:center;justify-content:center;gap:12px;padding:22px 28px;background:#28544b;z-index:2;box-shadow:0 18px 80px #061e1a40}.map-cloud svg{width:42px;height:42px}.map-cloud strong{font-size:22px;font-weight:400;font-family:Georgia,serif}.map-cloud small{display:block;font:10px Arial,sans-serif;letter-spacing:1.3px;text-transform:uppercase;color:#c3d8bf}.map-line{height:40px;border-left:1px dashed #8db594}.map-leaves{display:flex;gap:12px}.map-leaf{border:1px solid #64887a;border-radius:14px;background:#1d4840;padding:16px 12px;min-width:88px;text-align:center}.map-leaf span{display:block;font-size:22px;color:#c6e5bf}.map-leaf b{display:block;font-size:11px;font-weight:400;margin-top:8px}.map-note{font-size:11px;color:#b9ccb3;margin-top:18px}.section-head{display:flex;align-items:end;justify-content:space-between;gap:24px;margin:42px 0 20px}.section-head h2{font:400 32px/1.2 Georgia,serif;letter-spacing:-.8px;margin:5px 0}.section-head a{font-size:13px;text-underline-offset:4px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);padding:26px;display:flex;flex-direction:column;position:relative}.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.topic-icon{width:44px;height:44px;background:var(--soft);display:grid;place-items:center;border-radius:12px;font-size:20px}.number{font:12px monospace;color:var(--muted)}.tag{font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:var(--muted)}.card h3{font:400 26px/1.2 Georgia,serif;letter-spacing:-.6px;margin:10px 0}.card p{font-size:14px;color:var(--muted);margin:0 0 25px}.card-link{font-size:13px;font-weight:bold;text-decoration:none;margin-top:auto;padding-top:17px;border-top:1px solid var(--line);display:flex;justify-content:space-between}.note-strip{margin:28px 0 40px;padding:24px 0;display:grid;grid-template-columns:1fr 2fr;gap:32px;border-block:1px solid var(--line)}.note-strip h2{font:400 24px Georgia,serif;margin:0}.note-strip p{margin:0;font-size:14px;color:var(--muted)}footer{display:flex;justify-content:space-between;gap:24px;font-size:11px;color:var(--muted);padding:26px 0 32px}.breadcrumbs{font-size:12px;color:var(--muted);margin:30px 0}.breadcrumbs a{text-underline-offset:3px}.page-title{font:400 clamp(36px,5vw,58px)/1.1 Georgia,serif;letter-spacing:-1.5px;margin:10px 0 18px}.lede{font-size:17px;color:var(--muted);max-width:700px;margin:0 0 32px}.filters{display:flex;gap:8px;flex-wrap:wrap;margin:28px 0}.filter{border:1px solid var(--line);border-radius:100px;padding:8px 18px;background:transparent;color:var(--ink);font-size:13px}.filter[aria-pressed=true]{background:var(--ink);color:var(--bg);border-color:var(--ink)}[hidden]{display:none!important}.lesson{display:grid;grid-template-columns:minmax(0,2.5fr) 1fr;gap:50px;margin:30px 0 50px}.lesson h2{font:400 28px/1.3 Georgia,serif;margin:32px 0 12px}.lesson h2:first-child{margin-top:0}.lesson p,.lesson li{font-size:15px}.lesson ul{padding-left:22px}.lesson aside{border-left:1px solid var(--line);padding-left:28px}.lesson aside h2{font:700 11px Arial,sans-serif;letter-spacing:1.6px;text-transform:uppercase;margin-top:0}.lesson aside a{display:block;padding:10px 0;font-size:13px;color:var(--muted)}.example{background:var(--soft);border-radius:14px;padding:24px;margin:24px 0}.example .tag{display:block;margin-bottom:8px}.example p{margin:0}.table-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:12px;margin:22px 0}table{border-collapse:collapse;width:100%;font-size:13px}th,td{text-align:left;border-bottom:1px solid var(--line);padding:14px 16px;vertical-align:top}th{background:var(--soft);font-weight:700}tr:last-child td{border-bottom:0}details{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:18px 0;margin:24px 0}summary{cursor:pointer;font-weight:700;font-size:14px}details p{color:var(--muted)}.next-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}code{font-size:.92em;background:var(--soft);padding:3px 6px;border-radius:4px;overflow-wrap:anywhere}.about-panel{padding:30px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);margin:20px 0 35px;max-width:800px}.about-panel h2{font:400 25px Georgia,serif}.about-panel p{font-size:15px;color:var(--muted)}.filter-status{font-size:12px;color:var(--muted);min-height:22px}body.dark{--bg:#102d2a;--paper:#173b36;--ink:#eff3dd;--muted:#bbcdc1;--line:#3c5b52;--accent:#c6e5bf;--soft:#25493f;--hero:#1b4941;--onhero:#f6f6dc;color-scheme:dark}
@media(max-width:800px){.wrap{padding:0 22px}.hero{padding:36px;grid-template-columns:1fr;gap:8px}.cloud-map{height:230px}.hero h1{max-width:500px}.grid{grid-template-columns:1fr}.card-top{margin-bottom:12px}.card p{margin-bottom:20px}.lesson{grid-template-columns:1fr;gap:20px}.lesson aside{border-left:0;border-top:1px solid var(--line);padding:24px 0 0}.note-strip{grid-template-columns:1fr;gap:12px}.intro .small{display:none}.topbar{min-height:82px;gap:12px}nav{gap:14px}.brand{font-size:16px}.brand-mark{width:32px;height:32px}.theme{padding:5px 8px}.section-head{align-items:start}.section-head h2{font-size:28px}footer{flex-direction:column;gap:8px}}
@media(max-width:480px){.wrap{padding:0 16px}.topbar{flex-wrap:wrap;padding:16px 0}.brand{width:100%}nav{width:100%;justify-content:space-between}.hero{padding:30px 24px}.hero h1{font-size:44px}.map-leaf{min-width:75px;padding:14px 8px}.map-leaves{gap:8px}.page-title{font-size:40px}.section-head{flex-direction:column;gap:8px}}