:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --ink: #111827;
  --muted: #6b7280;
  --border: #e5e7eb;
  --bg: #f8fafc;
  --bg-card: #ffffff;
  --success: #16a34a;
  --warn: #b45309;
  --danger: #dc2626;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(17,24,39,.08), 0 1px 2px rgba(17,24,39,.04);
}

* { box-sizing: border-box; }
body { margin:0; font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; background:var(--bg); color:var(--ink); }
a { color: var(--primary); text-decoration: none; }

/* ============================================================
   LOGIN
============================================================ */
.login-screen { min-height:100vh; display:flex; align-items:center; justify-content:center; background: linear-gradient(160deg, #eef2ff, #f8fafc); }
.login-card { background:var(--bg-card); border:1px solid var(--border); border-radius:16px; box-shadow:var(--shadow); padding:40px 36px; width:360px; text-align:center; }
.login-logo { font-size:36px; margin-bottom:8px; }
.login-card h1 { font-size:20px; margin:0 0 6px; }
.login-sub { color:var(--muted); font-size:13px; margin-bottom:26px; }
.login-error { background:#fef2f2; color:var(--danger); font-size:13px; padding:8px 12px; border-radius:8px; margin-bottom:14px; }

/* ============================================================
   LAYOUT
============================================================ */
.admin-app { display:flex; min-height:100vh; }
.sidebar { width:230px; background:#0f172a; color:#e2e8f0; display:flex; flex-direction:column; flex-shrink:0; }
.sidebar__brand { display:flex; align-items:center; gap:10px; padding:22px 20px; font-weight:700; font-size:15px; border-bottom:1px solid rgba(255,255,255,.08); }
.sidebar__logo { font-size:20px; }
.sidebar__nav { flex:1; padding:14px 10px; display:flex; flex-direction:column; gap:2px; }
.nav-item { display:flex; align-items:center; gap:10px; padding:10px 12px; border-radius:8px; color:#cbd5e1; font-size:14px; font-weight:500; cursor:pointer; }
.nav-item:hover { background:rgba(255,255,255,.06); color:#fff; }
.nav-item.active { background:var(--primary); color:#fff; }
.nav-icon { font-size:15px; }
.sidebar__footer { padding:14px; border-top:1px solid rgba(255,255,255,.08); }

.admin-main { flex:1; padding:28px 32px; max-width:100%; overflow-x:hidden; }
.topbar { display:flex; align-items:center; justify-content:space-between; margin-bottom:24px; }
.topbar__title { font-size:22px; margin:0; }
.topbar__user { color:var(--muted); font-size:13px; }

.section-header { display:flex; align-items:center; justify-content:space-between; margin:28px 0 14px; }
.section-header h3 { margin:0; font-size:16px; }

/* ============================================================
   BUTTONS
============================================================ */
.btn { display:inline-flex; align-items:center; justify-content:center; gap:6px; border:1px solid transparent; border-radius:8px; padding:9px 16px; font-size:13px; font-weight:600; cursor:pointer; }
.btn--primary { background:var(--primary); color:#fff; }
.btn--primary:hover { background:var(--primary-dark); }
.btn--outline { background:#fff; border-color:var(--border); color:var(--ink); }
.btn--outline:hover { border-color:var(--primary); color:var(--primary); }
.btn--ghost { background:transparent; color:var(--muted); }
.btn--ghost:hover { color:var(--ink); }
.btn--sm { padding:6px 12px; font-size:12px; }
.btn--full { width:100%; }
.btn:disabled { opacity:.55; cursor:not-allowed; }

/* ============================================================
   FORMS
============================================================ */
.form-group { margin-bottom:16px; }
.form-group label { display:block; font-size:12px; font-weight:600; color:var(--muted); margin-bottom:6px; text-transform:uppercase; letter-spacing:.4px; }
.form-group input, .form-group select, .form-group textarea {
  width:100%; padding:9px 12px; border:1px solid var(--border); border-radius:8px; font-size:14px; font-family:inherit; background:#fff; color:var(--ink);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline:none; border-color:var(--primary); box-shadow:0 0 0 3px rgba(37,99,235,.12); }
.form-row { display:grid; grid-template-columns:1fr 1fr; gap:14px; }
.form-row > .form-group { margin-bottom:0; }

/* ============================================================
   CARDS / STATS
============================================================ */
.stats-grid { display:grid; grid-template-columns:repeat(4,1fr); gap:16px; margin-bottom:12px; }
.stat-card { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:18px 20px; box-shadow:var(--shadow); }
.stat-card__val { font-size:24px; font-weight:800; }
.stat-card__lbl { font-size:12px; color:var(--muted); margin-top:4px; }
.stat-card--accent .stat-card__val { color:var(--primary); }
.stat-card--warn .stat-card__val { color:var(--warn); }

.settings-grid { display:grid; grid-template-columns:1fr 1fr; gap:20px; }
.card { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow); }
.card__title { font-size:14px; font-weight:700; margin:0 0 16px; padding-bottom:12px; border-bottom:1px solid var(--border); }

.arca-wizard { padding-left:18px; margin:0; }
.arca-wizard li { margin-bottom:16px; line-height:1.5; font-size:13px; }
.arca-wizard li:last-child { margin-bottom:0; }
.arca-wizard code { background:#f1f5f9; padding:1px 5px; border-radius:4px; font-size:12px; }

/* ============================================================
   TABLES
============================================================ */
.table-wrap { background:var(--bg-card); border:1px solid var(--border); border-radius:var(--radius); overflow-x:auto; box-shadow:var(--shadow); }
table { width:100%; border-collapse:collapse; font-size:13px; }
th { text-align:left; font-size:11px; text-transform:uppercase; letter-spacing:.4px; color:var(--muted); padding:12px 14px; border-bottom:1px solid var(--border); }
td { padding:12px 14px; border-bottom:1px solid var(--border); }
tr:last-child td { border-bottom:none; }
.table-actions { display:flex; gap:6px; }

.status-badge { display:inline-block; padding:3px 9px; border-radius:20px; font-size:11px; font-weight:600; }
.status--simulacion { background:#fef3c7; color:var(--warn); }
.status--homologacion { background:#e0e7ff; color:#4338ca; }
.status--produccion { background:#dcfce7; color:var(--success); }

.empty-admin { text-align:center; padding:50px 20px; color:var(--muted); }
.empty-admin span { font-size:32px; display:block; margin-bottom:10px; }
.loading { width:22px; height:22px; border:3px solid var(--border); border-top-color:var(--primary); border-radius:50%; animation:spin .7s linear infinite; margin:20px auto; }
@keyframes spin { to { transform:rotate(360deg); } }

/* ============================================================
   MODAL
============================================================ */
.modal-overlay { position:fixed; inset:0; background:rgba(15,23,42,.5); display:none; align-items:flex-start; justify-content:center; padding:40px 16px; overflow-y:auto; z-index:100; }
.modal-overlay.open { display:flex; }
.modal { background:#fff; border-radius:14px; width:520px; max-width:100%; box-shadow:0 20px 50px rgba(0,0,0,.25); }
.modal--lg { width:680px; }
.modal__header { display:flex; align-items:center; justify-content:space-between; padding:18px 22px; border-bottom:1px solid var(--border); }
.modal__header h3 { margin:0; font-size:16px; }
.modal__close { background:none; border:none; font-size:16px; cursor:pointer; color:var(--muted); }
.modal__body { padding:22px; }

.comprobante-total { text-align:right; font-size:16px; margin-top:14px; padding-top:14px; border-top:1px dashed var(--border); }
.item-remove-btn { background:none; border:none; color:var(--danger); cursor:pointer; font-size:14px; }

.order-info-block { margin-bottom:14px; }
.order-info-block h4 { font-size:12px; text-transform:uppercase; letter-spacing:.5px; color:var(--muted); margin:0 0 8px; }
.order-info-row { display:flex; justify-content:space-between; font-size:13px; padding:4px 0; gap:12px; }
.order-info-row span { color:var(--muted); }

/* ============================================================
   TOAST
============================================================ */
.toast { position:fixed; bottom:24px; right:24px; background:#111827; color:#fff; padding:12px 18px; border-radius:8px; font-size:13px; opacity:0; transform:translateY(10px); transition:.25s; pointer-events:none; z-index:200; }
.toast.show { opacity:1; transform:translateY(0); }
.toast.success { background:#166534; }
.toast.error { background:#991b1b; }

@media (max-width: 900px) {
  .stats-grid { grid-template-columns:repeat(2,1fr); }
  .settings-grid { grid-template-columns:1fr; }
  .form-row { grid-template-columns:1fr; }
}