:root{--bg:#f5f5f5;--bg-card:#fff;--fg:#1a1a1a;--fg-muted:#666;--primary:#b71c1c;--primary-light:#ffcdd2;--border:#e0e0e0;--success:#2e7d32;--warning:#f57c00;--danger:#c62828}*{box-sizing:border-box;margin:0;padding:0}body{font-family:Helvetica Neue,-apple-system,system-ui,sans-serif;background:var(--bg);color:var(--fg);line-height:1.5}.container{max-width:1080px;margin:0 auto;padding:1.5rem}.header{background:var(--primary);color:#fff;padding:1.25rem 0}.header h1{font-size:1.6rem;display:inline-block;margin-right:1rem}.header .tagline{font-size:.9rem;opacity:.9}.card{background:var(--bg-card);border-radius:8px;padding:1.5rem;margin-bottom:1rem;border:1px solid var(--border)}.field-group{margin-bottom:1.25rem}.field-group label{display:block;margin-bottom:.35rem;font-weight:600;font-size:.9rem}.field-group input,.field-group select,.field-group textarea{width:100%;padding:.55rem .75rem;font-size:1rem;border:1px solid var(--border);border-radius:6px;background:var(--bg-card);color:var(--fg);font-family:inherit}.btn{background:var(--primary);color:#fff;padding:.65rem 1.25rem;border:0;border-radius:6px;cursor:pointer;font-weight:600}.btn:hover{background:#8b1414}.btn-secondary{background:#fff;color:var(--primary);border:1px solid var(--primary)}.btn:disabled{opacity:.5;cursor:not-allowed}.save-indicator{font-size:.8rem;color:var(--fg-muted)}.save-indicator.saved{color:var(--success)}.save-indicator.saving{color:var(--warning)}.alert{padding:1rem 1.25rem;border-radius:6px;margin-bottom:1rem}.alert-info{background:var(--primary-light);color:var(--primary)}.alert-success{background:#c8e6c9;color:var(--success)}.alert-error{background:#ffcdd2;color:var(--danger)}table{width:100%;border-collapse:collapse;margin-top:1rem}td,th{padding:.65rem .75rem;text-align:left;border-bottom:1px solid var(--border)}th{background:#f8f8f8;font-size:.85rem}.progress{display:inline-block;padding:.15rem .55rem;border-radius:99px;font-size:.8rem;font-weight:600}.progress.pendiente{background:#fff3e0;color:var(--warning)}.progress.enviado{background:#e3f2fd;color:#1976d2}.progress.evaluado{background:#c8e6c9;color:var(--success)}.score-correct{color:var(--success);font-weight:600}.score-incorrect{color:var(--danger);font-weight:600}