*{box-sizing:border-box;margin:0;padding:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;line-height:1.5;color:#333;background-color:#fff;margin:0;padding:0}#root{min-height:100vh}a{color:#007bff;text-decoration:none}a:hover{text-decoration:underline}button{font-family:inherit;font-size:inherit;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}:root{--bg: #F5F7FB;--bg-elev: #FFFFFF;--text: #0B0F19;--muted: #475569;--border: #E5E7EB;--accent: #2563EB;--accent-700: #1D4ED8;--ok: #16A34A;--warn: #F59E0B;--danger: #DC2626;--chip: #E8EEFF;--panel: #F1F5F9;--border-strong: #CBD5E1;--bw: 1.5px;--bw-2: 2px;--radius: 14px;--shadow: 0 2px 10px rgba(2, 6, 23, .06);--shadow-strong: 0 8px 30px rgba(2, 6, 23, .12);--sidebar-w: 300px;--space-1: 8px;--space-2: 12px;--space-3: 16px;--space-4: 20px;--space-6: 24px}@media(prefers-color-scheme:dark){:root{--bg: #0B1220;--bg-elev: #0F172A;--text: #E5E7EB;--muted: #A5B4FC;--border: #1F2937;--border-strong: #334155;--panel: #111827;--chip: #1E293B}}body.dark-mode{--bg: #0B1220;--bg-elev: #0F172A;--text: #E5E7EB;--muted: #A5B4FC;--border: #1F2937;--border-strong: #334155;--panel: #111827;--chip: #1E293B}body.dark-mode .topbar{background:#0f172a;border-bottom-color:#1e293b}.course-player{display:grid;grid-template-columns:1fr var(--sidebar-w);gap:16px;margin:0;padding:0;background:var(--bg);min-height:100vh}.topbar{position:sticky;top:0;z-index:10;grid-column:1 / -1;background:#17295b;border-bottom:var(--bw-2) solid #0f1d42;padding:4px 16px;display:grid;grid-template-columns:auto auto 1fr auto;gap:16px;align-items:center}.logo-slot{display:flex;align-items:center}.logo-slot img{height:38px;width:auto;object-fit:contain}.crumbs{font-size:14px;color:#ffffffbf;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.topbar .crumbs b{color:#fffffff2}.topbar .crumbs 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var(--border-strong);border-radius:var(--radius)}.module>summary{list-style:none;cursor:pointer;-webkit-user-select:none;user-select:none;padding:14px;border-bottom:var(--bw) solid var(--border-strong);font-weight:700;display:flex;align-items:center;justify-content:space-between}.module>summary::marker{display:none}.module[open]>summary{background:linear-gradient(0deg,#2563eb14,#2563eb14);border-right:3px solid var(--accent)}.lesson{display:grid;grid-template-columns:20px 1fr auto;gap:8px;align-items:center;padding:10px 14px;cursor:pointer;border-top:var(--bw) solid var(--border-strong);transition:background .2s}.lesson:hover{background:#2563eb14}.lesson .dot{width:12px;height:12px;border-radius:999px;border:2px solid var(--border-strong)}.lesson.completed .dot{background:var(--ok);border-color:var(--ok)}.lesson.active{background:#2563eb24;border-left:4px solid var(--accent);font-weight:600;box-shadow:inset 0 0 0 1px #2563eb33}.lesson.active 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strong{color:#d97706}.certificate-progress{font-size:12px;color:var(--muted);font-weight:500}.certificate-indicator.locked .certificate-progress{color:#b45309}.certificate-indicator.unlocked .certificate-progress{color:#15803d}@media(prefers-color-scheme:dark){.certificate-indicator.locked{background:linear-gradient(135deg,#fbbf241f,#f59e0b2e);border-color:#f59e0b}.certificate-indicator.locked .certificate-text strong{color:#fbbf24}.certificate-indicator.locked .certificate-progress{color:#fcd34d}.certificate-indicator.unlocked{background:linear-gradient(135deg,#16a34a26,#22c55e33)}.certificate-indicator.unlocked .certificate-progress{color:#4ade80}}.tools-page{min-height:100vh;transition:background .3s ease}.tools-container{width:100%;padding:1.5rem 2rem;display:grid;grid-template-columns:280px 1fr;gap:2rem;box-sizing:border-box}.tools-sidebar{border-radius:16px;padding:1.75rem;height:fit-content;position:sticky;top:100px;transition:all .3s ease}.tools-main{animation:fadeIn .6s 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