:root{--a:#1769d2;--v:#6757df;--t:#0b8c76;--ink:#11263d;--mut:#62758a;--line:#dfe8f1;--bg:#f6f9fc;--card:#fff}
.edu-page{background:var(--bg);color:var(--ink)}.edu-page main{overflow:hidden}.edu-wrap{width:min(1160px,calc(100% - 30px));margin:auto}
.edu-hero{padding:68px 0 52px;background:radial-gradient(circle at 85% 5%,rgba(103,87,223,.18),transparent 30%),radial-gradient(circle at 10% 10%,rgba(11,140,118,.12),transparent 27%),linear-gradient(135deg,#f5fbff,#fbf9ff 55%,#fff);border-bottom:1px solid var(--line)}
.edu-hero-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);gap:38px;align-items:center}.kicker{font-size:10px;font-weight:900;letter-spacing:.13em;color:var(--a)}.edu-hero h1{font-size:clamp(40px,5vw,70px);line-height:1.04;letter-spacing:-.045em;margin:10px 0 18px}.edu-hero h1 em{font-style:normal;color:var(--v)}.edu-hero p{font-size:15px;line-height:1.8;color:#4d637a}
.pills{display:flex;flex-wrap:wrap;gap:7px;margin-top:18px}.pill{padding:7px 10px;border:1px solid #dbe5ef;border-radius:999px;background:#fff;font-size:9.5px;font-weight:850;color:#576b80}
.actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:0 14px;border:1px solid #d8e2ed;border-radius:11px;background:#fff;color:#304a64;text-decoration:none;font:900 10.5px/1 system-ui;cursor:pointer}.btn.primary{background:var(--a);color:#fff;border-color:var(--a)}
.hero-panel{padding:20px;border:1px solid #dbe5ef;border-radius:22px;background:rgba(255,255,255,.9);box-shadow:0 15px 50px rgba(23,49,80,.08)}.hero-panel h2{font-size:18px;margin:4px 0 12px}.path{display:grid;gap:7px}.path a{display:grid;grid-template-columns:28px 1fr auto;gap:8px;align-items:center;padding:9px;border:1px solid #e2e9f1;border-radius:11px;text-decoration:none;color:#3b536c;font-size:10px;font-weight:850}.path b{display:grid;place-items:center;width:28px;height:28px;border-radius:8px;background:#eff5fc;color:var(--a)}.path i{font-style:normal;color:#92a0af}
.sec{padding:46px 0}.sec.alt{background:#fff;border-block:1px solid var(--line)}.head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:18px}.head h2{font-size:29px;letter-spacing:-.035em;margin:5px 0}.head p{margin:0;color:var(--mut);font-size:11.5px;line-height:1.65}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.course{display:flex;flex-direction:column;padding:18px;border:1px solid var(--line);border-radius:17px;background:#fff;min-height:250px;box-shadow:0 8px 28px rgba(27,48,74,.04)}.course-top{display:flex;justify-content:space-between}.course-top b{font:900 11px/1 ui-monospace,monospace;color:var(--a)}.level{font-size:8.5px;font-weight:900;padding:5px 7px;border-radius:999px;background:#eef4fb;color:#647589}.course h3{margin:13px 0 7px;font-size:19px}.course p{margin:0;color:#687a8d;font-size:11px;line-height:1.68}.course ul{margin:13px 0 17px;padding:0;list-style:none;display:grid;gap:5px}.course li{font-size:9.7px;color:#586c81}.course li:before{content:"✓";color:var(--t);font-weight:900;margin-right:7px}.course>a{margin-top:auto;text-decoration:none;color:var(--a);font-size:10.5px;font-weight:900}
.principles{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}.principle{padding:16px;border-radius:15px;background:#132941;color:#fff}.principle b{font-size:9px;color:#90c7ff}.principle h3{margin:7px 0 5px;font-size:15px}.principle p{margin:0;color:#bfd0df;font-size:10px;line-height:1.6}
.progress{position:sticky;top:0;z-index:999;height:3px;background:#e8eef4}.progress span{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--a),var(--v))}
.lesson{padding:46px 0}.lesson-grid{display:grid;grid-template-columns:220px minmax(0,1fr);gap:28px}.side{position:sticky;top:82px;align-self:start;padding:14px;border:1px solid var(--line);border-radius:15px;background:#fff}.side b{font-size:9.5px}.side nav{display:grid;gap:4px;margin-top:9px}.side a{padding:7px 8px;border-radius:8px;text-decoration:none;color:#62758a;font-size:9.3px;font-weight:800}.side a:hover{background:#eff5fb;color:var(--a)}
.content>section{scroll-margin-top:90px;margin-bottom:40px}.content h2{font-size:26px;letter-spacing:-.03em;margin:0 0 11px}.content h3{font-size:16px;margin:18px 0 7px}.content p,.content li{font-size:12px;line-height:1.78;color:#52687f}.content .lead{font-size:13.5px;color:#344d67}
.timeline{display:grid;gap:8px}.step{display:grid;grid-template-columns:40px 1fr;gap:11px;padding:13px;border:1px solid var(--line);border-radius:14px;background:#fff}.stepn{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:#eff5fc;color:var(--a);font-weight:900}.step h3{margin:1px 0 4px;font-size:13px}.step p{margin:0;font-size:10.7px}
.table{width:100%;border-collapse:separate;border-spacing:0;border:1px solid var(--line);border-radius:13px;overflow:hidden;background:#fff;font-size:10px}.table th,.table td{padding:9px;border-bottom:1px solid #e7edf3;text-align:left;vertical-align:top}.table th{background:#f2f6fa;color:#344b63;font-size:8.8px}.table tr:last-child td{border-bottom:0}
.callout{padding:16px;border:1px solid #cfe3dc;border-radius:15px;background:#eef9f5}.callout.warn{border-color:#eadcc6;background:#fff8ed}.callout.danger{border-color:#efced0;background:#fff2f2}.callout b{display:block;margin-bottom:5px;font-size:10px}.callout p{margin:0;font-size:10.8px}
.dodont{display:grid;grid-template-columns:1fr 1fr;gap:10px}.dodont article{padding:16px;border:1px solid var(--line);border-radius:15px;background:#fff}.dodont .do{border-top:3px solid var(--t)}.dodont .dont{border-top:3px solid #d45b63}.dodont h3{margin:0 0 8px;font-size:13px}.dodont ul{margin:0;padding-left:16px}.dodont li{font-size:10.3px}
.lab{padding:20px;border-radius:18px;background:#132941;color:#fff}.lab p{color:#bdd0df}.prompt{position:relative;margin-top:12px;padding:14px 52px 14px 14px;border:1px solid rgba(255,255,255,.12);border-radius:12px;background:#0c2035;color:#dceaf6;font:500 10.3px/1.7 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap}.copy{position:absolute;right:8px;top:8px;padding:6px 8px;border:1px solid rgba(255,255,255,.16);border-radius:8px;background:#1c3652;color:#fff;font-size:8.5px;font-weight:900;cursor:pointer}
.next{display:grid;grid-template-columns:1fr 1fr;gap:9px}.next a{padding:14px;border:1px solid var(--line);border-radius:14px;background:#fff;color:#344d66;text-decoration:none}.next small{display:block;color:#8b99a8;font-size:8px}.next b{display:block;margin-top:4px;font-size:12px}.source-note{margin-top:14px;padding-top:11px;border-top:1px dashed #dce5ee;color:#8795a4;font-size:8.7px;line-height:1.6}.toast{position:fixed;left:50%;bottom:84px;z-index:99999;transform:translate(-50%,15px);opacity:0;padding:9px 12px;border-radius:999px;background:#10243b;color:#fff;font-size:9px;font-weight:900;transition:.18s}.toast.show{opacity:1;transform:translate(-50%,0)}
@media(max-width:940px){.edu-hero-grid,.lesson-grid{grid-template-columns:1fr}.grid{grid-template-columns:repeat(2,1fr)}.principles{grid-template-columns:repeat(2,1fr)}.side{position:relative;top:auto}}
@media(max-width:620px){.edu-wrap{width:calc(100% - 24px)}.edu-hero{padding:40px 0 32px}.edu-hero h1{font-size:40px}.grid,.principles,.dodont,.next{grid-template-columns:1fr}.head{display:block}.course{min-height:0}.sec{padding:34px 0}.side nav{grid-template-columns:1fr 1fr}}


/* V57.17 · lesson readability: previously-small detail text +1px */
.edu-page .side b{font-size:10.5px}
.edu-page .side a{font-size:10.3px}
.edu-page .content p,.edu-page .content li{font-size:13px}
.edu-page .content .lead{font-size:14.5px}
.edu-page .step p{font-size:11.7px}
.edu-page .table{font-size:11px}
.edu-page .table th{font-size:9.8px}
.edu-page .callout b{font-size:11px}
.edu-page .callout p{font-size:11.8px}
.edu-page .dodont li{font-size:11.3px}
.edu-page .prompt{font-size:11.3px}
.edu-page .copy{font-size:9.5px}
.edu-page .next small{font-size:9px}
.edu-page .next b{font-size:13px}
.edu-page .source-note{font-size:9.7px}
.edu-page .toast{font-size:10px}