:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light dark;--bg:#0f1115;--surface:#1a1d24;--border:#2a2e37;--text:#e8eaed;--text-muted:#9aa0aa;--accent:#4f8cff;--error:#ff5c5c;font-family:system-ui,-apple-system,Segoe UI,sans-serif}@media (prefers-color-scheme:dark){:root{--lightningcss-light: ;--lightningcss-dark:initial}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0}a{color:var(--accent)}button{cursor:pointer;background:var(--accent);color:#fff;border:none;border-radius:6px;padding:.6rem 1rem;font-size:1rem}button:disabled{opacity:.6;cursor:not-allowed}input{border:1px solid var(--border);background:var(--surface);color:var(--text);border-radius:6px;padding:.5rem .7rem;font-size:1rem}.status-message{color:var(--text-muted);padding:1rem}.error-message{color:var(--error)}.auth-page{justify-content:center;align-items:center;min-height:100vh;display:flex}.auth-form{background:var(--surface);border:1px solid var(--border);border-radius:12px;flex-direction:column;gap:1rem;width:100%;max-width:360px;padding:2rem;display:flex}.auth-form label{color:var(--text-muted);flex-direction:column;gap:.35rem;font-size:.9rem;display:flex}.course-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:1.5rem 2rem;display:flex}.course-header-user{color:var(--text-muted);align-items:center;gap:1rem;display:flex}.course-page{max-width:900px;margin:0 auto}.section-block{padding:1rem 2rem}.section-block h2{border-bottom:1px solid var(--border);padding-bottom:.5rem}.module-block{margin:1rem 0 1.5rem}.module-block h3{color:var(--text-muted);margin-bottom:.5rem;font-size:1rem}.lesson-list{gap:.4rem;margin:0;padding:0;list-style:none;display:grid}.lesson-list li{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:.5rem .75rem}.lesson-list a{text-decoration:none}.lesson-page{max-width:960px;margin:0 auto;padding:1.5rem 2rem}.back-link{margin-bottom:1rem;display:inline-block}.video-player{background:#000;border-radius:8px;width:100%}.admin-page{max-width:1100px;margin:0 auto}.admin-table{border-collapse:collapse;width:100%;margin:1rem 2rem}.admin-table th,.admin-table td{text-align:left;border-bottom:1px solid var(--border);padding:.6rem .75rem}.admin-table th{color:var(--text-muted);font-size:.9rem;font-weight:500}.admin-actions{gap:.5rem;display:flex}.admin-actions button{padding:.4rem .7rem;font-size:.85rem}.admin-actions button.danger{background:var(--error)}.admin-link{color:var(--text-muted)}.continue-watching{padding:1rem 2rem 0}.continue-watching h2{border-bottom:1px solid var(--border);padding-bottom:.5rem}.continue-watching-list{gap:.4rem;margin:0;padding:0;list-style:none;display:grid}.continue-watching-list li{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:.5rem .75rem}.continue-watching-list a{justify-content:space-between;gap:1rem;text-decoration:none;display:flex}.continue-watching-progress{color:var(--text-muted);font-size:.85rem}