:root{
  --bg:#f3f6f8;--panel:#fff;--text:#18202a;--muted:#667383;--line:#dce3e8;
  --accent:#1d6e63;--accent2:#0e4b45;--soft:#e8f4f1;--dark:#17252d;
  --warn:#b86b19;--ok:#287c55;--shadow:0 10px 25px rgba(24,32,42,.07);
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
.topbar{height:76px;background:var(--dark);color:white;display:flex;justify-content:space-between;align-items:center;padding:0 28px;position:sticky;top:0;z-index:20}
.brand{display:flex;align-items:center;gap:12px}.brand h1{font-size:18px;margin:0}.brand p{font-size:12px;margin:3px 0 0;color:#b7c3c9}
.brand-mark{width:40px;height:40px;border-radius:10px;background:var(--accent);display:grid;place-items:center;font-weight:800;font-size:22px}
.top-actions{display:flex;align-items:center;gap:14px}.avatar{width:38px;height:38px;border-radius:50%;background:#2b3e49;display:grid;place-items:center;font-size:12px}
.app-shell{display:grid;grid-template-columns:250px 1fr;min-height:calc(100vh - 76px)}
.sidebar{padding:24px 16px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;justify-content:space-between}
.sidebar nav{display:flex;flex-direction:column;gap:6px}.nav-item{border:0;background:transparent;text-align:left;padding:12px 14px;border-radius:9px;color:#52606d}
.nav-item:hover,.nav-item.active{background:var(--soft);color:var(--accent2);font-weight:700}
.sidebar-card{border:1px solid var(--line);border-radius:12px;padding:16px}.sidebar-card small{color:var(--muted)}
.progress{height:8px;border-radius:99px;background:#e9eef1;overflow:hidden;margin:12px 0 7px}.progress span{display:block;height:100%;width:0;background:var(--accent)}
.content{padding:30px;max-width:1450px;width:100%;margin:auto}.view{display:none}.view.active{display:block}
.hero{background:linear-gradient(135deg,#173039,#1f5a55);color:white;border-radius:18px;padding:38px;display:grid;grid-template-columns:1.6fr .6fr;gap:30px;align-items:center;box-shadow:var(--shadow)}
.hero h2{font-size:38px;line-height:1.08;margin:9px 0 14px;max-width:700px}.hero p{color:#d2dfe1;max-width:650px;line-height:1.6}
.eyebrow{font-size:11px;letter-spacing:.16em;font-weight:800;color:#72a99f}.hero .eyebrow{color:#9acdc5}
.primary,.secondary,.ghost,.text-btn{border-radius:8px;padding:10px 15px;border:1px solid transparent;font-weight:700}
.primary{background:var(--accent);color:white}.primary:hover{background:var(--accent2)}
.secondary{background:white;border-color:var(--line);color:var(--text)}.ghost{background:transparent;color:white;border-color:#4d626b}.text-btn{background:transparent;padding-left:0;color:var(--accent)}
.hero-card{text-align:center}.ring{--p:0; width:145px;height:145px;border-radius:50%;margin:auto;display:grid;place-items:center;background:conic-gradient(#59aa9e calc(var(--p)*1%),#31535a 0);position:relative}
.ring:after{content:"";position:absolute;width:110px;height:110px;border-radius:50%;background:#1a3c42}.ring span{position:relative;z-index:2;font-size:28px;font-weight:800}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:22px 0}.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.stat-card,.panel{background:var(--panel);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow)}
.stat-card{padding:21px}.stat-card span,.stat-card small{display:block;color:var(--muted)}.stat-card strong{display:block;font-size:28px;margin:7px 0}
.panel{padding:24px;margin:20px 0}.panel-head,.section-head{display:flex;align-items:center;justify-content:space-between;gap:16px}.panel h3{margin-top:0}.section-head h2{font-size:29px;margin:6px 0}.section-head p{color:var(--muted)}
.module-list{display:grid;gap:10px}.module-row{display:grid;grid-template-columns:44px 1fr auto;align-items:center;gap:14px;padding:13px;border:1px solid var(--line);border-radius:10px}
.module-index{width:38px;height:38px;border-radius:9px;background:var(--soft);display:grid;place-items:center;color:var(--accent2);font-weight:800}
.module-row h4{margin:0 0 3px}.module-row p{margin:0;color:var(--muted);font-size:13px}.badge{padding:6px 9px;border-radius:99px;background:#eef2f4;color:#5c6b76;font-size:12px}
.module-card{background:#fff;border:1px solid var(--line);border-radius:14px;margin:16px 0;overflow:hidden}.module-title{padding:19px 20px;background:#f9fbfc;border-bottom:1px solid var(--line)}
.module-title h3{margin:4px 0}.module-title p{margin:0;color:var(--muted)}.lesson-row{display:grid;grid-template-columns:32px 1fr auto auto;gap:12px;align-items:center;padding:14px 20px;border-bottom:1px solid #edf1f3}
.lesson-row:last-child{border-bottom:0}.lesson-row.completed{background:#f7fbf9}.lesson-status{width:22px;height:22px;border:1px solid #bcc8cf;border-radius:50%;display:grid;place-items:center;font-size:12px}
.lesson-row.completed .lesson-status{background:var(--ok);color:white;border-color:var(--ok)}.lesson-row h4{margin:0 0 3px;font-size:15px}.lesson-row p{margin:0;color:var(--muted);font-size:12px}
.lesson-body{background:white;border:1px solid var(--line);border-radius:14px;padding:28px;line-height:1.7}.lesson-body h2{font-size:31px}.lesson-body .meta{color:var(--muted);margin-bottom:24px}
.lesson-body .callout{padding:16px;border-left:4px solid var(--accent);background:var(--soft);border-radius:6px;margin:20px 0}
label{display:block;font-size:13px;font-weight:700;margin:13px 0}input,select,textarea{display:block;width:100%;margin-top:7px;padding:11px 12px;border:1px solid #cbd5db;border-radius:8px;background:white}
textarea{min-height:130px;resize:vertical}.checklist{display:grid;gap:8px;margin:16px 0}.check-item{display:flex;align-items:center;gap:10px;padding:10px;border:1px solid var(--line);border-radius:8px}.check-item input{width:auto;margin:0}
.feedback{margin-top:14px;padding:12px;border-radius:8px;display:none}.feedback.show{display:block}.feedback.good{background:#e8f5ee;color:#1e6a45}.feedback.bad{background:#fff0e5;color:#915315}
.calc-result{font-weight:800;font-size:19px;background:#f3f7f7;padding:15px;border-radius:8px;margin-top:14px}.quiz-question{margin:22px 0}.quiz-question p{font-weight:800}.quiz-option{display:flex;gap:9px;align-items:flex-start;margin:8px 0}.quiz-option input{width:auto;margin:4px 0 0}
.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.resource-card{background:white;border:1px solid var(--line);border-radius:12px;padding:18px;box-shadow:var(--shadow)}
.resource-icon{width:42px;height:42px;border-radius:10px;background:var(--soft);display:grid;place-items:center;font-weight:800;color:var(--accent2)}.resource-card h3{font-size:16px;margin-bottom:7px}.resource-card p{color:var(--muted);font-size:13px;min-height:42px}.resource-card a{color:var(--accent);font-weight:800;text-decoration:none}
#notesArea{min-height:430px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;line-height:1.6}.save-state{font-size:12px;color:var(--muted);margin-top:8px}
.manager-item{display:grid;grid-template-columns:1fr auto;gap:12px;border-top:1px solid var(--line);padding:13px 0}.manager-item:first-child{border-top:0}.manager-item small{color:var(--muted)}
.danger{background:#fff1ef;color:#a13b2e;border:1px solid #f1c9c2;border-radius:7px;padding:7px 10px}
@media(max-width:900px){.app-shell{grid-template-columns:1fr}.sidebar{display:none}.content{padding:18px}.hero{grid-template-columns:1fr}.grid-2,.grid-3,.resource-grid{grid-template-columns:1fr}.hero h2{font-size:30px}.lesson-row{grid-template-columns:30px 1fr}.lesson-row .badge,.lesson-row button{grid-column:2}}