:root{
  --bg:#f5f7fb; --panel:#fff; --ink:#162033; --muted:#64748b; --line:#e2e8f0;
  --primary:#c71f37; --primary2:#97152a; --success:#177245; --warning:#a16207;
  --shadow:0 10px 28px rgba(15,23,42,.08); --radius:18px;
}
*{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(--ink)}
button,input,select,textarea{font:inherit} button{cursor:pointer}
.shell{min-height:100vh}.topbar{position:sticky;top:0;z-index:5;background:#111827;color:#fff;padding:14px 24px;display:flex;align-items:center;justify-content:space-between;box-shadow:0 3px 14px rgba(0,0,0,.15)}
.brand{font-weight:800;letter-spacing:.2px}.brand span{color:#ff6478}.nav{display:flex;gap:8px;align-items:center}.nav button{border:0;border-radius:10px;padding:9px 12px;background:#263244;color:#fff}.nav button:hover{background:#374151}
.container{max-width:1180px;margin:0 auto;padding:28px 18px 48px}.hero{background:linear-gradient(135deg,#111827,#27364d);color:#fff;border-radius:24px;padding:34px;box-shadow:var(--shadow);margin-bottom:22px}.hero h1{margin:0 0 8px;font-size:clamp(28px,5vw,46px)}.hero p{margin:0;color:#d7dee8;max-width:760px;line-height:1.6}
.grid{display:grid;gap:18px}.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.card h2,.card h3{margin-top:0}.muted{color:var(--muted)}
.stat{font-size:34px;font-weight:800;margin:6px 0}.pill{display:inline-block;padding:5px 9px;border-radius:999px;background:#eef2ff;color:#3730a3;font-size:12px;font-weight:700}.pill.green{background:#ecfdf5;color:#166534}.pill.amber{background:#fff7ed;color:#9a3412}
.btn{border:0;border-radius:12px;padding:11px 15px;background:var(--primary);color:#fff;font-weight:750}.btn:hover{background:var(--primary2)}.btn.secondary{background:#e8edf5;color:#172033}.btn.secondary:hover{background:#dce4ef}.btn.success{background:var(--success)}.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}.btn.small{padding:8px 10px;font-size:13px}
.course-card{display:flex;flex-direction:column;gap:12px}.progress{height:12px;border-radius:99px;background:#e7ebf1;overflow:hidden}.progress>div{height:100%;background:var(--primary);border-radius:99px}.row{display:flex;gap:12px;align-items:center}.between{justify-content:space-between}.wrap{flex-wrap:wrap}
.login-wrap{min-height:100vh;display:grid;place-items:center;padding:24px;background:radial-gradient(circle at top,#2a3a52,#111827 60%)}.login{width:min(460px,100%);background:#fff;border-radius:24px;padding:28px;box-shadow:0 22px 55px rgba(0,0,0,.3)}.login h1{margin:0 0 6px}.field{display:grid;gap:7px;margin:14px 0}.field label{font-weight:700;font-size:14px}.field input,.field select,.field textarea{width:100%;border:1px solid #cbd5e1;border-radius:12px;padding:12px;background:#fff}.demo{font-size:13px;background:#f8fafc;border:1px dashed #cbd5e1;padding:12px;border-radius:12px;line-height:1.55}
.lesson-list{display:grid;gap:10px}.lesson{padding:14px;border:1px solid var(--line);border-radius:14px;display:flex;justify-content:space-between;gap:12px;align-items:center}.lesson.done{background:#f0fdf4}.lesson.current{border-color:#fb7185;background:#fff1f2}.lesson-title{font-weight:750}
.video{aspect-ratio:16/9;background:#111827;border-radius:16px;display:grid;place-items:center;color:#fff;text-align:center;padding:26px;margin-bottom:16px}.video .play{font-size:54px}.content{line-height:1.7}.quiz-option{display:block;border:1px solid var(--line);border-radius:12px;padding:12px;margin:8px 0}.quiz-option:hover{background:#f8fafc}.quiz-option input{margin-right:10px}
.table-wrap{overflow:auto}.table{width:100%;border-collapse:collapse}.table th,.table td{text-align:left;padding:12px;border-bottom:1px solid var(--line);white-space:nowrap}.table th{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:#64748b}
.notice{border-left:4px solid var(--primary);padding:12px 14px;background:#fff1f2;border-radius:8px;margin:14px 0}.certificate{background:#fff;border:10px double #111827;padding:44px;text-align:center;max-width:880px;margin:20px auto}.certificate h1{font-family:Georgia,serif;font-size:48px;margin:10px}.certificate .name{font-size:34px;font-weight:800;margin:20px 0}.certificate .course{font-size:24px}.certificate .meta{margin-top:32px;display:flex;justify-content:space-around;gap:16px}.certificate .sig{border-top:1px solid #333;padding-top:8px;min-width:220px}
footer{text-align:center;color:#7c8799;font-size:13px;padding-top:28px}@media(max-width:820px){.grid-3,.grid-2{grid-template-columns:1fr}.topbar{padding:12px}.nav{gap:5px}.nav button{padding:8px}.certificate{padding:22px}.certificate h1{font-size:34px}.certificate .meta{flex-direction:column}.hero{padding:24px}}
@media print{.topbar,.no-print,footer{display:none!important}.container{max-width:none;padding:0}.certificate{box-shadow:none;margin:0;border-width:8px;min-height:95vh;display:flex;flex-direction:column;justify-content:center}}