:root {
  --bg: #f5f6f8;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --border: #e2e5ea;
  --primary: #1f3a5f;
  --primary-dark: #16293f;
  --accent: #2f7d5f;
  --danger: #b3261e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.topbar { background: var(--primary); color: #fff; }
.topbar-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  gap: 28px;
  flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.1rem; }
.topbar nav a {
  color: #cfd9e8;
  text-decoration: none;
  margin-right: 18px;
  font-size: 0.95rem;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.topbar nav a:hover { color: #fff; }
.topbar nav a.active { color: #fff; border-bottom-color: var(--accent); }
.user-menu { margin-left: auto; color: #cfd9e8; font-size: 0.88rem; white-space: nowrap; }
.user-menu a { color: #cfd9e8; }
.user-menu a:hover { color: #fff; }

.container { max-width: 1100px; margin: 0 auto; padding: 24px 20px 60px; }

h1 { font-size: 1.5rem; margin-bottom: 4px; }
h2 { font-size: 1.15rem; margin-top: 28px; }
.subtitle { color: var(--muted); margin-bottom: 20px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 20px;
}

table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.03em; }
tr:last-child td { border-bottom: none; }

.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; }
label { display: block; font-size: 0.85rem; color: var(--muted); margin-bottom: 4px; }
input, select { width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 0.95rem; }
input:focus, select:focus { outline: 2px solid var(--primary); outline-offset: 1px; }

button, .btn {
  display: inline-block;
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 9px 18px;
  border-radius: 6px;
  font-size: 0.92rem;
  cursor: pointer;
  text-decoration: none;
}
button:hover, .btn:hover { background: var(--primary-dark); }
.btn-secondary { background: #fff; color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: #f1f2f4; }
.btn-danger { background: var(--danger); }
.btn-sm { padding: 5px 10px; font-size: 0.82rem; }

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 16px; font-size: 0.9rem; }
.alert-success { background: #e6f4ea; color: #1e7038; }
.alert-error { background: #fbe9e7; color: var(--danger); }

.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 0.75rem; font-weight: 600; }
.badge-disponible { background: #e6f4ea; color: #1e7038; }
.badge-vendida { background: #eee; color: #666; }

.actions-row { display: flex; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; align-items: end; }

.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 16px; margin-top: 16px; }
.stat-card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 18px; }
.stat-card .stat-value { font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { color: var(--muted); font-size: 0.85rem; }

.empty-state { color: var(--muted); padding: 30px 0; text-align: center; }