:root{--blue: #1f4e79;--blue-light: #dce6f1;--green: #2e7d32;--amber: #b45309;--red: #c62828;--gray: #595959;color-scheme:light}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:#f7f8fa;color:#1a1a1a;-webkit-font-smoothing:antialiased}.app-shell{max-width:720px;margin:0 auto;min-height:100vh;background:#fff;box-shadow:0 0 24px #0000000d}.app-header{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:16px 20px;background:var(--blue);color:#fff;position:sticky;top:0;z-index:10}.app-title{font-weight:700;font-size:1.1rem}.supabase-warning{font-size:.75rem;background:#ffffff26;padding:4px 8px;border-radius:6px}main{padding:20px 20px 60px}h1{font-size:1.4rem;color:var(--blue)}h2{font-size:1.1rem;color:var(--blue);margin-top:28px}.hint{color:var(--gray);font-size:.9rem}.readiness-card{background:var(--blue-light);border-radius:16px;padding:20px;text-align:center}.readiness-score{font-size:3rem;font-weight:800;color:var(--blue)}.score-table{width:100%;border-collapse:collapse;margin-top:8px}.score-table th,.score-table td{text-align:left;padding:10px 8px;border-bottom:1px solid #eee}.score-table th{color:var(--gray);font-size:.8rem;text-transform:uppercase;letter-spacing:.03em}.primary-button{display:block;width:100%;margin-top:20px;padding:14px;font-size:1rem;font-weight:600;color:#fff;background:var(--blue);border:none;border-radius:12px;cursor:pointer}.primary-button:disabled{background:#b7c4d0;cursor:not-allowed}.back-link{background:none;border:none;color:var(--blue);font-size:.95rem;cursor:pointer;padding:0;margin-bottom:12px}.source-text{background:#fafafa;border-radius:12px;padding:16px 18px;line-height:1.6;font-size:.95rem;border:1px solid #eee}.question-card{border:1px solid #eee;border-radius:12px;padding:14px 16px;margin-top:14px}.question-card.correct{border-color:var(--green);background:#f1f8f1}.question-card.wrong{border-color:var(--red);background:#fdf2f2}.question-prompt{font-weight:600;margin-bottom:8px}.options{display:flex;flex-direction:column;gap:8px}.option{display:flex;align-items:center;gap:8px;font-size:.92rem}.badge{font-size:.75rem;padding:2px 6px;border-radius:6px}.correct-badge{background:#e6f4ea;color:var(--green)}.explanation{margin-top:10px;padding-top:10px;border-top:1px dashed #ddd;font-size:.88rem}.error-category{color:var(--amber);font-weight:600;margin:0 0 4px}.result-summary{margin-top:24px}.logout-button{background:none;border:none;color:#fff;opacity:.85;font-size:.8rem;cursor:pointer;padding:0;white-space:nowrap}.login-screen{max-width:360px;margin:40px auto 0;text-align:center}.login-form{display:flex;flex-direction:column;gap:12px;margin-top:20px}.login-form input{padding:12px 14px;font-size:1rem;border:1px solid #ccc;border-radius:10px}.login-form .primary-button{margin-top:0}