:root{--bg:#f8fafc;--surface:#ffffff;--text:#0f172a;--muted:#64748b;--border:#e2e8f0;--accent:#2563eb;--accent-hover:#1d4ed8;--danger:#dc2626;--radius:10px;--shadow:0 1px 3px rgba(15,23,42,0.08);font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);line-height:1.5}a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}.container{max-width:960px;margin:0 auto;padding:1.5rem}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;border:none;border-radius:8px;padding:.6rem 1rem;font-size:.95rem;font-weight:600;cursor:pointer;background:var(--accent);color:white}.btn:hover{background:var(--accent-hover)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-secondary{background:white;color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:#f1f5f9}.form-grid{display:grid;grid-gap:1rem;gap:1rem}@media (min-width:640px){.form-grid-2{grid-template-columns:1fr 1fr}.form-grid-3{grid-template-columns:1fr 1fr 1fr}}label{display:block;font-size:.875rem;font-weight:600;margin-bottom:.35rem}input,select,textarea{width:100%;padding:.55rem .7rem;border:1px solid var(--border);border-radius:8px;font-size:1rem}input:focus,select:focus,textarea:focus{outline:2px solid color-mix(in srgb,var(--accent) 40%,transparent);border-color:var(--accent)}.muted{color:var(--muted);font-size:.9rem}.nav{display:flex;gap:1rem;align-items:center;padding:1rem 1.5rem;background:var(--surface);border-bottom:1px solid var(--border)}.nav a{color:var(--text);font-weight:500}.nav a:hover{color:var(--accent);text-decoration:none}.nav-brand{font-weight:700;margin-right:auto}.table{width:100%;border-collapse:collapse;font-size:.9rem}.table td,.table th{text-align:left;padding:.65rem .5rem;border-bottom:1px solid var(--border)}.badge{display:inline-block;padding:.15rem .5rem;border-radius:999px;font-size:.75rem;font-weight:600;background:#e0e7ff;color:#3730a3}.price-total{font-size:1.75rem;font-weight:700}.alert{padding:.75rem 1rem;border-radius:8px;background:#fef2f2;color:var(--danger);border:1px solid #fecaca}.alert-success{background:#f0fdf4;color:#166534;border-color:#bbf7d0}