*{margin:0;padding:0;box-sizing:border-box}:root{--primary:#5b8def;--primary-light:#8ba8f5;--primary-dark:#3d6fd1;--secondary:#6b7280;--accent:#f59e0b;--accent-light:#fcd34d;--text:#374151;--text-light:#6b7280;--text-muted:#9ca3af;--white:#fff;--background:#f8fafc;--surface:#fff;--border:#e5e7eb;--border-light:#f1f5f9;--success:#10b981;--success-light:#d1fae5;--warning:#f59e0b;--warning-light:#fef3c7;--danger:#ef4444;--danger-light:#fee2e2;--shadow-sm:0 1px 2px rgba(0,0,0,.04);--shadow:0 1px 3px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);--shadow-md:0 4px 6px -1px rgba(0,0,0,.06),0 2px 4px -1px rgba(0,0,0,.04);--shadow-lg:0 10px 15px -3px rgba(0,0,0,.06),0 4px 6px -2px rgba(0,0,0,.04);--focus-ring:3px solid var(--primary-light);--radius-sm:6px;--radius:10px;--radius-lg:14px;--radius-full:9999px}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe 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(max-width:768px){.header-content{text-align:center}.header-content,.logo{flex-direction:column}.header-stats{width:100%;justify-content:center}.lesson-card{grid-template-columns:1fr;gap:1rem}.lesson-time{display:flex;align-items:center;justify-content:center;gap:12px;padding:.75rem}.lesson-time-value{font-size:1.1rem}.lesson-actions{flex-direction:row}.action-buttons,.lesson-actions{justify-content:flex-start;width:100%}}