:root{color-scheme:light;--bg:#f4f7f8;--surface:#fff;--ink:#172d34;--muted:#52686f;--border:#d6e1e4;--brand:#126452;--brand-soft:#e3f4eb;--nav:#102b31;--nav-text:#c6d9db;--lime:#b6efac;--amber:#925115;--amber-soft:#fff5e7;--red:#a83135;--red-soft:#fff0f1;--shadow:0 6px 24px #16343a07;--radius:16px;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.55}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink)}body.dark{color-scheme:dark;--bg:#101f25;--surface:#182c33;--ink:#e7f2f3;--muted:#abc3c8;--border:#36505a;--brand:#a8e6bd;--brand-soft:#244438;--amber:#ffd099;--amber-soft:#3b3126;--red:#ffb2b5;--red-soft:#432b32;--shadow:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button,a{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:var(--brand);text-decoration:none}a:hover{text-decoration:underline}button:disabled{opacity:.5;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #3390cc;outline-offset:4px}h1,h2,h3,p{margin:0 0 .8rem}h1{font-size:clamp(1.8rem,3vw,2.6rem);letter-spacing:-.04em;line-height:1.14;font-weight:750}h2{font-size:1.35rem;letter-spacing:-.025em;line-height:1.3}h3{font-size:1.1rem;letter-spacing:-.015em}p:last-child{margin-bottom:0}small,.small{font-size:.86rem}.muted{color:var(--muted)}.eyebrow{font-size:.76rem;text-transform:uppercase;letter-spacing:.1em;font-weight:750;color:var(--muted);margin-bottom:12px}.skip{position:fixed;top:-80px;left:20px;background:var(--surface);padding:12px;z-index:100}.skip:focus{top:12px}.loading{padding:60px;text-align:center}.icon{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex:none}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:10px 18px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--ink);font-weight:650;text-decoration:none;font-size:.92rem}.btn:hover{background:var(--bg);text-decoration:none}.btn.primary{background:var(--brand);color:var(--surface);border-color:var(--brand)}body.dark .btn.primary{color:#102b31}.btn.primary:hover{filter:brightness(.95)}.btn.subtle{background:transparent;border-color:transparent}.btn.danger{color:var(--red)}.btn.icon-only{padding:10px;width:46px}.row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.between{justify-content:space-between}.stack{display:grid;gap:16px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.three{grid-template-columns:repeat(3,minmax(0,1fr))}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);min-width:0}.card.link{display:block;color:var(--ink);transition:transform .15s,border-color .15s}.card.link:hover{transform:translateY(-2px);border-color:var(--brand);text-decoration:none}.pill{display:inline-flex;align-items:center;border:1px solid var(--border);border-radius:6px;padding:3px 9px;font-size:.76rem;font-weight:700;white-space:nowrap}.pill.green{color:var(--brand);background:var(--brand-soft);border-color:transparent}.pill.amber{background:var(--amber-soft);color:var(--amber);border-color:transparent}.section-title{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:28px 0 14px}.section-title h2{margin:0}.page-head{margin-bottom:26px}.page-head .row{margin-bottom:12px}.page-head p{max-width:680px;color:var(--muted)}.sidebar{position:fixed;inset:0 auto 0 0;width:236px;background:var(--nav);color:var(--nav-text);display:flex;flex-direction:column;padding:30px 20px;z-index:20}.brand{display:flex;gap:12px;align-items:center;color:white;font-size:1.08rem;font-weight:720;letter-spacing:-.02em}.brand:hover{text-decoration:none}.brand 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.brand{display:none}.status{font-size:.8rem;color:var(--muted);display:flex;align-items:center;gap:7px}.status::before{content:'';height:6px;width:6px;background:var(--brand);border-radius:50%}.status.warn::before{background:var(--amber)}.avatar{height:31px;width:31px;display:grid;place-items:center;border-radius:50%;background:var(--brand-soft);color:var(--brand);font-size:.8rem;font-weight:700}#main{max-width:1260px;margin:auto;padding:36px 42px 60px;outline:none}.bottomnav{display:none}.focus-card{background:var(--nav);color:#eef6f4;border:0;padding:32px;position:relative;overflow:hidden}.focus-card .eyebrow{color:var(--lime)}.focus-card h2{font-size:1.95rem;max-width:510px;line-height:1.15;letter-spacing:-.035em}.focus-card p{color:#bfd3d5;max-width:440px}.focus-card .btn.primary{background:var(--lime);color:#15372b;border-color:var(--lime);margin-top:20px}.focus-card .pill{color:#d0dfde;border-color:#52696c}.focus-grid{display:grid;grid-template-columns:1.5fr 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.dot{width:24px;height:24px;border-radius:50%;border:1px solid var(--border);display:grid;place-items:center;flex:none;font-size:.75rem}.lesson-nav a.complete .dot{background:var(--brand-soft);color:var(--brand);border:0}.lesson-footer{display:flex;justify-content:space-between;gap:12px;margin-top:25px;padding-top:20px;border-top:1px solid var(--border)}.field{display:block;margin:16px 0}.field>span,.field>label{display:block;margin-bottom:7px;font-size:.9rem;font-weight:650}.field small{display:block;color:var(--muted);margin-top:7px}input,select,textarea{border:1px solid var(--border);background:var(--surface);border-radius:9px;padding:11px 13px;width:100%;color:var(--ink);min-height:46px}textarea{resize:vertical;min-height:120px;line-height:1.6}input[type=checkbox]{width:20px;min-height:20px;margin:0;accent-color:var(--brand)}.checkline{display:flex;align-items:flex-start;gap:12px;font-size:.92rem;min-height:44px;padding:8px 0;cursor:pointer}.checkline 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.dot{fill:var(--brand);stroke:var(--surface);stroke-width:2}.formula{padding:16px;background:var(--bg);font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:.92rem;border-radius:10px;overflow-wrap:anywhere}.auth-wrap{min-height:100vh;display:grid;grid-template-columns:1fr 1fr}.auth-story{background:var(--nav);color:#f0f5f4;padding:60px clamp(32px,5vw,90px);display:flex;flex-direction:column;justify-content:space-between;min-height:600px}.auth-story h1{font-size:clamp(2.7rem,4.5vw,4.2rem);max-width:560px;line-height:1.04;letter-spacing:-.05em;margin:55px 0 20px}.auth-story h1 span{color:var(--lime)}.auth-story p{color:#c3d8db;max-width:390px}.auth-story .eyebrow{color:var(--lime)}.auth-content{display:flex;justify-content:center;align-items:center;padding:45px 30px}.auth-form{width:100%;max-width:390px}.auth-form .btn.primary{width:100%;margin-top:10px}.auth-steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:50px;border-top:1px solid #526a70;padding-top:25px}.auth-steps b{display:block;color:var(--lime);margin-bottom:5px}.auth-steps span{font-size:.84rem;color:#d1dedf}.auth-error{color:var(--red);margin:14px 0;min-height:24px}.empty{text-align:center;padding:34px;max-width:600px;margin:auto}.empty h2{margin-top:12px}.search{max-width:440px}.file-btn{position:relative;overflow:hidden}.file-btn input{position:absolute;opacity:0;inset:0;cursor:pointer}.account-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px}.sync-banner{border:1px solid var(--amber);background:var(--amber-soft);color:var(--amber);padding:12px 20px;font-size:.88rem;margin-bottom:20px;border-radius:10px}#toast{position:fixed;bottom:24px;left:50%;transform:translate(-50%,20px);opacity:0;pointer-events:none;background:#173c39;color:#fff;padding:12px 20px;border-radius:12px;box-shadow:0 4px 20px #0002;max-width:min(520px,90vw);z-index:100;font-size:.9rem;transition:.15s}#toast.show{opacity:1;transform:translate(-50%,0)}dialog{color:var(--ink);background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:28px;max-width:min(640px,92vw);width:100%;max-height:85vh;overflow:auto}dialog::backdrop{background:#091f2bae;backdrop-filter:blur(3px)}dialog pre{white-space:pre-wrap;overflow-wrap:anywhere;font-size:.9rem;max-height:250px;overflow:auto;background:var(--bg);padding:15px;border-radius:8px}dialog .row{margin-top:20px}.footnote{font-size:.8rem;color:var(--muted);margin-top:24px}.keyvalue{display:grid;grid-template-columns:1fr 1fr;gap:10px}.keyvalue div{border-bottom:1px solid var(--border);padding:10px 0}.keyvalue strong{display:block;font-size:1.3rem}.project-counter{font-size:.8rem;color:var(--muted)}.print-only{display:none}.chip-list{display:flex;flex-wrap:wrap;gap:8px}.topic-tag{font-size:.8rem;background:var(--bg);border:1px solid var(--border);border-radius:6px;padding:4px 9px}.source-list a{display:block;padding:12px 0;border-bottom:1px solid var(--border)}
@media(min-width:1500px){.sidebar{width:260px}.workspace{margin-left:260px}#main{padding-top:45px}.topbar{padding:0 54px}}
@media(max-width:1100px){.sidebar{width:205px;padding:25px 13px}.workspace{margin-left:205px}#main{padding:28px}.topbar{padding:0 28px}.lesson-layout{grid-template-columns:minmax(0,1fr) 220px}.focus-grid{grid-template-columns:1.2fr 1fr}.focus-card{padding:26px}.metric-tiles{grid-template-columns:repeat(2,1fr)}}
@media(max-width:820px){.sidebar{display:none}.workspace{margin-left:0}.topbar{height:72px;padding:0 22px}.topbar .brand{display:flex;color:var(--ink)}.topbar .crumb{display:none}.topbar .brand img{width:32px;height:32px}.topbar .brand{font-size:1rem}.account-name{display:none}#main{padding:26px 22px 110px}.bottomnav{display:flex;position:fixed;bottom:0;left:0;right:0;background:var(--surface);border-top:1px solid var(--border);padding:8px 8px max(8px,env(safe-area-inset-bottom));z-index:20;justify-content:space-around}.bottomnav a{display:flex;flex:1;flex-direction:column;align-items:center;justify-content:center;gap:4px;min-height:48px;color:var(--muted);font-size:.71rem;font-weight:600;border-radius:8px}.bottomnav a.active{color:var(--brand);background:var(--brand-soft)}.bottomnav a:hover{text-decoration:none}.bottomnav .icon{width:22px;height:22px}.lesson-layout{grid-template-columns:1fr}.lesson-nav{position:static;order:-1;padding:12px 18px;display:flex;overflow:auto;gap:17px}.lesson-nav a{border:0;white-space:nowrap;padding:3px 0}.lesson-nav a span:not(.dot){display:none}.lesson-nav a.active span:not(.dot){display:inline}.auth-wrap{grid-template-columns:1fr}.auth-story{min-height:auto;padding:30px}.auth-story h1{font-size:2.5rem;margin:30px 0 16px}.auth-story .auth-steps{display:none}.auth-story>p{display:none}.auth-content{padding:32px 24px}.auth-story .brand{font-size:1rem}.auth-story .eyebrow{margin-top:24px}.auth-story h1 br{display:none}#toast{bottom:95px}.three{grid-template-columns:1fr 1fr}}
@media(max-width:580px){.topbar{padding:0 16px;gap:7px}.topbar .row{gap:5px}.topbar .status{display:none}.topbar .btn.icon-only{width:40px;min-height:42px;padding:8px}.topbar .btn.account{padding:6px;border:0}#main{padding:24px 16px 108px}.grid,.focus-grid,.account-grid,.three{grid-template-columns:1fr;gap:16px}.card{padding:21px}.focus-card{padding:25px}.focus-card h2{font-size:1.7rem}.page-head{margin-bottom:22px}.page-head h1{font-size:2rem}.page-head p{font-size:.94rem}.section-title{margin-top:25px}.module-row{grid-template-columns:36px 1fr;gap:12px;padding:15px}.module-number{width:36px;height:36px;font-size:.8rem}.module-status{grid-column:2;text-align:left;display:flex;gap:10px}.module-row h3{font-size:1rem}.module-row p{font-size:.8rem}.metric-row{gap:12px}.lesson-body{font-size:1rem;line-height:1.75}.lesson-footer{flex-wrap:wrap}.lesson-footer .btn{flex:1}.quiz h2{font-size:1.25rem}.choices .choice{padding:14px;gap:10px}.metric-tiles{gap:9px}.metric-tiles strong{font-size:1.45rem}.bar-row{grid-template-columns:90px 1fr 30px;font-size:.77rem}.auth-story{padding:26px 24px}.auth-story h1{font-size:2.25rem}.auth-content{align-items:flex-start}.tabs .btn{padding:9px 13px;font-size:.85rem}.table-wrap{margin:12px 0}.btn{font-size:.88rem}.row.responsive{display:grid;grid-template-columns:1fr}.row.responsive>*{width:100%}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}
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