:root{--brand:#222222;--bg:#f5f6f8;--card:#ffffff;--text:#1a1d21;--muted:#6b7280;--border:#e5e7eb;--radius:14px}*{box-sizing:border-box}body,html{height:100%;margin:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;font-size:16px;line-height:1.5;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}main{min-height:100%}img{max-width:100%;height:auto;display:block}.screen{max-width:640px;margin:0 auto;padding:20px 16px calc(28px + env(safe-area-inset-bottom))}.screen.center{min-height:100%;display:flex;align-items:center;justify-content:center}.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:12px;margin-bottom:20px}.topbar h1{font-size:26px;line-height:1.2;margin:2px 0 0}.eyebrow{margin:0;font-size:13px;font-weight:600;letter-spacing:.02em;text-transform:uppercase;color:var(--brand)}.brand{display:flex;align-items:center;gap:10px;min-width:0}.brand-logo{width:40px;height:40px;border-radius:9px;object-fit:cover;flex-shrink:0}.brand-name{font-weight:700;font-size:16px;color:var(--brand);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.page-title{font-size:26px;line-height:1.2;margin:4px 0 12px}.lead{margin:0 0 12px;color:var(--muted)}.progress-line{margin:0 0 16px;font-size:14px;font-weight:600;color:var(--brand)}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px}.card h1{margin-top:0;font-size:24px}.card .notice,.card.empty{color:var(--muted)}.auth-card{width:100%;max-width:380px}label{display:block;font-size:14px;font-weight:600;margin:14px 0 6px}input{width:100%;padding:12px 14px;font-size:16px;border:1px solid var(--border);border-radius:10px;background:#fff}input:focus{outline:2px solid var(--brand);outline-offset:1px}.btn,button{display:inline-block;width:100%;margin-top:16px;padding:13px 16px;font-size:16px;font-weight:600;text-align:center;text-decoration:none;color:#fff;background:var(--brand);border:none;border-radius:10px;cursor:pointer}button:disabled{opacity:.5;cursor:not-allowed}button.link{width:auto;margin:12px 0 0;padding:0;color:var(--muted);background:none;font-weight:500;text-decoration:underline}.logout{margin-top:0;white-space:nowrap}.notice{font-size:14px;color:var(--muted)}.error{margin-top:14px;color:#b00020;font-size:14px}.course-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}.course-card{display:block;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:16px;text-decoration:none;color:inherit}.course-card:active{background:#fafafa}.course-head{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}.course-title{font-size:17px;font-weight:600}.course-desc{margin:8px 0 0;font-size:14px;color:var(--muted)}.course-tags{display:flex;flex-wrap:wrap;gap:6px;margin-top:12px}.tag{font-size:12px;padding:3px 8px;border-radius:999px;background:#eef0f3;color:var(--muted);text-transform:capitalize}.tag-required{background:#fdecec;color:#b00020}.badge{flex-shrink:0;font-size:12px;font-weight:600;padding:4px 10px;border-radius:999px;white-space:nowrap}.status-none{background:#eef0f3;color:var(--muted)}.status-in_progress{background:#fff4d6;color:#8a5a00}.status-completed{background:#def7e5;color:#1b7a3d}.lesson-list{list-style:none;margin:16px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}.lesson-row{display:flex;align-items:center;gap:12px;padding:14px 16px;background:var(--card);border:1px solid var(--border);border-radius:12px;text-decoration:none;color:inherit}.lesson-row:active{background:#fafafa}.lesson-check{flex-shrink:0;display:grid;place-items:center;width:28px;height:28px;border-radius:999px;background:#eef0f3;color:var(--muted);font-size:14px;font-weight:700}.lesson-check.done{background:var(--brand);color:#fff}.lesson-name{font-weight:500}.lesson-media{width:100%;height:auto;border-radius:var(--radius);margin:4px 0 16px}.lesson-content{font-size:16px;line-height:1.6}.lesson-content :first-child{margin-top:0}.lesson-content img{border-radius:10px;margin:12px 0}.btn-done{background:#1b7a3d}.lesson-nav{display:flex;align-items:center;justify-content:space-between;gap:12px}.exam-card,.lesson-nav{margin-top:20px}.exam-card h2{margin:0 0 8px;font-size:18px}.btn-disabled{background:#c8ccd2;pointer-events:none}.quiz{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:16px}.question fieldset{margin:0;padding:16px;border:1px solid var(--border);border-radius:12px;background:var(--card)}.question legend{font-weight:600;padding:0 6px}.option{display:flex;align-items:center;gap:10px;padding:10px 6px;cursor:pointer}.option input{width:auto;margin:0}.result-fail{border-color:#f3c2c2;background:#fdf3f3}.certificate{margin-top:8px;padding:28px 22px;text-align:center;background:var(--card);border:2px solid var(--brand);border-radius:var(--radius)}.cert-kicker{margin:0;font-size:13px;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--brand)}.cert-course{margin:10px 0 4px;font-size:24px;line-height:1.2}.cert-for{margin:12px 0 0;color:var(--muted)}.cert-name{margin:4px 0 0;font-size:20px;font-weight:700}.cert-meta{display:flex;justify-content:center;gap:28px;flex-wrap:wrap;margin:22px 0 8px}.cert-meta dt{font-size:12px;text-transform:uppercase;letter-spacing:.04em;color:var(--muted)}.cert-meta dd{margin:2px 0 0;font-weight:600}