:root{
  --bg:#f5f7fb;
  --surface:#ffffff;
  --surface-2:#eef7f6;
  --text:#17202a;
  --muted:#667085;
  --primary:#0f766e;
  --primary-dark:#0b5e58;
  --accent:#f59e0b;
  --danger:#b42318;
  --border:#dfe5ec;
  --shadow:0 12px 35px rgba(15, 23, 42, .08);
  --radius:18px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.55}
button,input,textarea{font:inherit}
button{cursor:pointer}
.topbar{position:sticky;top:0;z-index:30;height:72px;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 22px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text)}
.brand-mark{display:grid;place-items:center;width:42px;height:42px;border-radius:12px;background:var(--primary);color:#fff;font-weight:900;font-size:1.25rem}
.brand strong,.brand small{display:block}
.brand small{color:var(--muted);font-size:.78rem}
.top-actions{display:flex;align-items:center;gap:10px}
.badge{font-size:.82rem;padding:7px 10px;border-radius:999px;background:#f2f4f7;color:var(--muted)}
.badge.online{background:#e7f8ee;color:#087443}
.badge.offline{background:#fff1f0;color:#b42318}
.icon-btn{border:0;background:#eef2f6;border-radius:10px;padding:9px 12px;display:none}
.app-shell{display:grid;grid-template-columns:260px 1fr;min-height:calc(100vh - 72px)}
.sidebar{background:#0f172a;color:#e5edf7;padding:22px 14px;position:sticky;top:72px;height:calc(100vh - 72px);display:flex;flex-direction:column;justify-content:space-between}
.sidebar nav{display:grid;gap:7px}
.nav-item{border:0;background:transparent;color:#cbd5e1;text-align:left;padding:12px 14px;border-radius:12px;font-weight:650;display:flex;gap:10px;align-items:center}
.nav-item:hover,.nav-item.active{background:#1e293b;color:#fff}
.sidebar-note{border:1px solid #334155;background:#111c31;border-radius:14px;padding:14px;display:grid;gap:5px}
.sidebar-note strong{color:#fff}
.sidebar-note span{font-size:.88rem}
.sidebar-note small{color:#94a3b8}
.main{padding:34px;max-width:1400px;width:100%;margin:0 auto}
.view{display:none}
.view.active{display:block}
.hero{display:grid;grid-template-columns:1.5fr .75fr;gap:28px;align-items:stretch}
.hero>div:first-child,.brain-card,.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.hero>div:first-child{padding:42px}
.hero h1,.page-head h1{font-size:clamp(2rem,4vw,3.5rem);line-height:1.05;margin:.25rem 0 1rem;letter-spacing:-.03em}
.lead{font-size:1.08rem;color:var(--muted);max-width:800px}
.eyebrow{font-size:.78rem;letter-spacing:.14em;font-weight:800;color:var(--primary);margin:0;text-transform:uppercase}
.hero-actions,.portfolio-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.btn{border:1px solid transparent;border-radius:12px;padding:11px 16px;font-weight:750}
.btn.primary{background:var(--primary);color:#fff}
.btn.primary:hover{background:var(--primary-dark)}
.btn.secondary{background:#fff;border-color:var(--border);color:var(--text)}
.btn.ghost{background:#eef7f6;color:var(--primary)}
.btn.danger{background:#fff;border-color:#f0b6b1;color:var(--danger)}
.brain-card{padding:28px;display:flex;flex-direction:column;justify-content:center;text-align:center;background:linear-gradient(160deg,#eef7f6,#fff)}
.brain{font-size:5rem}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:22px 0}
.stat-card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:18px;display:flex;gap:14px;align-items:center}
.stat-card>span{font-size:1.8rem}
.stat-card strong,.stat-card small{display:block}
.stat-card strong{font-size:1.3rem}
.stat-card small{color:var(--muted)}
.panel{padding:24px;margin:18px 0}
.panel-head{display:flex;align-items:center;justify-content:space-between}
.case-box{background:#f8fafc;border-left:5px solid var(--primary);padding:15px 17px;border-radius:10px;margin:14px 0}
.choice-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}
.choice-grid button,.option-btn{border:1px solid var(--border);background:#fff;padding:14px;border-radius:12px;text-align:left}
.choice-grid button:hover,.option-btn:hover{border-color:var(--primary);background:#f0fdfa}
.choice-grid button.correct,.option-btn.correct{border-color:#17a673;background:#eafbf2}
.choice-grid button.wrong,.option-btn.wrong{border-color:#d92d20;background:#fff0ef}
.feedback{margin-top:12px;padding:0}
.feedback.show{padding:12px 14px;border-radius:10px;background:#f1f5f9}
.page-head{margin-bottom:26px}
.page-head p{max-width:900px;color:var(--muted)}
.timeline{display:grid;gap:18px}
.timeline-card{display:grid;grid-template-columns:70px 1fr;gap:18px;background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px}
.timeline-num{width:54px;height:54px;border-radius:50%;display:grid;place-items:center;background:var(--primary);color:#fff;font-weight:900;font-size:1.25rem}
.timeline-card.pending{opacity:.65}
.timeline-card span{color:var(--primary);font-weight:750}
.progress-line{height:11px;background:#e6eaef;border-radius:999px;overflow:hidden;margin-top:12px}
.progress-line span{display:block;height:100%;width:0;background:var(--primary);transition:width .3s ease}
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.module-card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px;display:grid;gap:10px;box-shadow:0 7px 24px rgba(15,23,42,.04)}
.module-card.done{border-color:#9bd8bd;background:#fbfffd}
.module-card .module-num{width:38px;height:38px;border-radius:10px;display:grid;place-items:center;background:#e8f4f3;color:var(--primary);font-weight:900}
.module-card h3{margin:0}
.module-card p{color:var(--muted);margin:0}
.module-meta{display:flex;gap:8px;flex-wrap:wrap}
.chip{font-size:.75rem;background:#f2f4f7;border-radius:999px;padding:5px 8px;color:#475467}
.back-btn{border:0;background:transparent;color:var(--primary);font-weight:750;margin-bottom:14px}
.lesson-hero{background:#fff;border:1px solid var(--border);border-radius:18px;padding:28px;margin-bottom:18px}
.lesson-section{background:#fff;border:1px solid var(--border);border-radius:16px;padding:22px;margin:16px 0}
.lesson-section h2{margin-top:0}
.theory-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.theory-card{background:#f8fafc;border:1px solid var(--border);border-radius:12px;padding:14px}
.theory-card h4{margin:.1rem 0 .4rem}
.example{padding:14px;border-radius:12px;background:#fffbeb;border:1px solid #fde68a}
.question-box{padding:16px;border-radius:12px;background:#f8fafc;border:1px solid var(--border);margin:12px 0}
.question-box .options{display:grid;gap:8px;margin-top:10px}
.reflection{display:grid;gap:10px}
textarea,input[type=text]{width:100%;border:1px solid var(--border);border-radius:10px;padding:12px;background:#fff}
textarea{min-height:110px;resize:vertical}
.form-stack{display:grid;gap:14px}
.form-stack label{display:grid;gap:7px;font-weight:650}
.lab-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.lab-item{padding:12px 0;border-bottom:1px solid var(--border)}
.lab-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.mini-btn{border:1px solid var(--border);background:#fff;border-radius:10px;padding:8px 10px}
.portfolio-list{display:grid;gap:12px;margin-top:20px}
.evidence-card{background:#fff;border:1px solid var(--border);border-radius:14px;padding:17px}
.evidence-card h4{margin:0 0 5px}
.evidence-card small{color:var(--muted)}
.evidence-card pre{white-space:pre-wrap;font-family:inherit;background:#f8fafc;border-radius:10px;padding:12px;max-height:220px;overflow:auto}
.progress-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.progress-card{background:#fff;border:1px solid var(--border);border-radius:16px;padding:20px}
.skill-row{margin:14px 0}
.skill-row header{display:flex;justify-content:space-between;font-size:.9rem}
.skill-bar{height:9px;background:#edf0f4;border-radius:999px;overflow:hidden}
.skill-bar span{display:block;height:100%;background:var(--primary)}
.toast-host{position:fixed;right:18px;bottom:18px;display:grid;gap:10px;z-index:100}
.toast{background:#17202a;color:#fff;padding:12px 14px;border-radius:10px;box-shadow:var(--shadow);max-width:340px}
.notice{font-size:.9rem;color:var(--muted)}
hr.soft{border:0;border-top:1px solid var(--border);margin:20px 0}
.locked{opacity:.58}
@media (max-width:1050px){
  .module-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:820px){
  .app-shell{grid-template-columns:1fr}
  .sidebar{position:fixed;left:-280px;top:72px;width:260px;z-index:50;transition:left .2s ease}
  .sidebar.open{left:0}
  .icon-btn{display:block}
  .main{padding:22px 16px}
  .hero{grid-template-columns:1fr}
  .brain-card{display:none}
  .lab-grid,.progress-grid{grid-template-columns:1fr}
}
@media (max-width:580px){
  .topbar{padding:0 12px}
  .badge{display:none}
  .brand small{display:none}
  .hero>div:first-child{padding:25px}
  .stats-grid,.module-grid,.choice-grid,.theory-grid{grid-template-columns:1fr}
  .timeline-card{grid-template-columns:52px 1fr;padding:16px}
  .main{padding:16px 11px}
}