*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,apple-system,Segoe UI,Roboto,Helvetica,Arial;background:var(--bg);color:#111827}.container{width:100%;max-width:1100px;margin:20px auto;padding:0 16px}.App{display:flex;flex-direction:column;min-height:100vh}.site-header{background:var(--card);border-bottom:1px solid #e6e9ee;width:100%}.header-inner{display:flex;align-items:center;justify-content:space-between;padding:16px;max-width:1100px;margin:0 auto}.logo{font-weight:700;font-size:20px;cursor:pointer}.main-nav .nav-lnk{background:var(--primary);color:#fff;padding:8px 12px;border-radius:8px;border:none;cursor:pointer}.site-footer{margin-top:auto;padding:16px 0;background:transparent;text-align:center;color:var(--muted);width:100%}.footer-inner{max-width:1100px;margin:0 auto;padding:0 16px}main.container{flex-grow:1;display:flex;flex-direction:column;justify-content:center;max-width:1100px;padding:20px 16px;margin:0 auto}.slide-card{background:var(--card);border-radius:10px;padding:20px;box-shadow:0 6px 18px #0f172a0f;width:100%}.slide-header{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}.slide-image img{max-width:100%;height:auto;border-radius:8px;margin-bottom:12px}.slide-body p{margin:8px 0;line-height:1.5;color:#374151}.btn{padding:10px 14px;border-radius:8px;font-size:14px;border:1px solid transparent;cursor:pointer}.btn.primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn.secondary{background:#fff;color:#111827;border-color:#d1d5db}.btn.ghost{background:transparent;border:1px solid transparent;color:var(--muted)}.btn.success{background:#16a34a;color:#fff;border-color:#16a34a}.btn[disabled]{opacity:.6;cursor:not-allowed}.nav-buttons{display:flex;justify-content:flex-end;gap:8px;margin-top:16px}.progress-bar-wrapper{margin:12px 0 18px}.progress-track{height:8px;background:#eef2f6;border-radius:8px;overflow:hidden}.progress-fill{height:100%;background:var(--primary);transition:width .3s ease}.progress-text{font-size:12px;color:var(--muted);margin-top:6px}.quiz-card{background:var(--card);padding:18px;border-radius:10px;box-shadow:0 6px 18px #0f172a0f;width:100%}.quiz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px;gap:10px}.question-block h3{margin:0 0 12px;font-size:18px;color:#0f172a}.options-grid{display:grid;gap:10px}.quiz-option{text-align:left;padding:12px 14px;border-radius:8px;border:1px solid #e5e7eb;background:#fff;cursor:pointer}.quiz-option:hover{box-shadow:0 6gpx 18px #0f172a0f}.selected-option{background:#eef2ff;border-left:5px solid var(--primary)}.correct-answer{background-color:var(--green);border-left:5px solid var(--green-border)!important}.incorrect-answer{background-color:var(--red);border-left:5px solid var(--red-border)!important}.quiz-actions{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:16px}.result-card{background:var(--card);padding:20px;border-radius:10px;box-shadow:0 6px 18px #0f172a0f;text-align:left}.result-pass{color:#166534}.result-fail{color:#9a3412}@media (max-width: 640px){.header-inner{padding:12px}.container{padding:0 12px}.nav-buttons{justify-content:center}}.login-card{background:var(--card);border-radius:10px;padding:24px;box-shadow:0 6px 18px #0f172a0f;width:100%;max-width:400px;margin:40px auto;text-align:left}.login-card h2{margin-bottom:16px;text-align:center;color:#0f172a}.form-group{margin-bottom:14px;display:flex;flex-direction:column}.form-group label{font-size:14px;font-weight:600;margin-bottom:6px;color:#374151}.form-group input{padding:10px 12px;border-radius:8px;border:1px solid #d1d5db;font-size:14px}.form-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 2px #2563eb33}.error-message{color:#dc2626;font-size:13px;margin-bottom:10px;text-align:center}:root{--primary: #2563EB;--accent: #F97316;--bg: #f4f6f9;--muted: #6b7280;--card: #ffffff;--green: #d4edda;--green-border: #28a745;--red: #f8d7da;--red-border: #dc3545}