:root {
  --bg: #f2f3f5;
  --card-bg: #ffffff;
  --text: #1a1a1a;
  --text-soft: #666;
  --border: #dcdde1;
  --primary: #1c4e9c;
  --danger: #c0392b;
  --success: #1e7a4c;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}
.topbar {
  background: var(--primary);
  color: #fff;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
.topbar .marca { font-weight: 700; font-size: 1.1rem; }
.topbar nav { display: flex; gap: 16px; flex-wrap: wrap; }
.topbar nav a { color: #fff; text-decoration: none; opacity: 0.9; font-size: 0.95rem; }
.topbar nav a:hover { opacity: 1; text-decoration: underline; }
.contenedor { max-width: 960px; margin: 24px auto; padding: 0 20px; }
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 24px;
}
h1 { font-size: 1.4rem; margin: 0 0 16px; }
h2 { font-size: 1.1rem; margin: 0 0 12px; }
table { width: 100%; border-collapse: collapse; font-size: 0.92rem; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--text-soft); font-weight: 600; }
.form-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 12px 16px; }
.form-grid label { display: flex; flex-direction: column; font-size: 0.88rem; color: var(--text-soft); gap: 4px; }
input, select {
  padding: 9px 10px; border: 1px solid var(--border); border-radius: 8px;
  font-size: 0.95rem; background: #fff; color: var(--text);
}
button, .btn {
  padding: 9px 16px; border-radius: 8px; border: none; background: var(--primary);
  color: #fff; font-size: 0.92rem; cursor: pointer; text-decoration: none; display: inline-block;
}
button.secundario, .btn.secundario { background: #eee; color: var(--text); }
button.peligro, .btn.peligro { background: var(--danger); }
.acciones { display: flex; gap: 8px; }
.aviso { padding: 10px 14px; border-radius: 8px; margin-bottom: 16px; font-size: 0.92rem; }
.aviso.ok { background: #e3f5ea; color: var(--success); }
.aviso.error { background: #fbe6e3; color: var(--danger); }
.codigo-generado {
  font-size: 1.4rem; font-weight: 700; letter-spacing: 4px; background: #eef4ff;
  color: var(--primary); padding: 10px 16px; border-radius: 8px; display: inline-block;
}
.login-box {
  max-width: 360px; margin: 80px auto; background: #fff; padding: 32px;
  border-radius: 14px; border: 1px solid var(--border);
}
.login-box h1 { text-align: center; }
.login-box form { display: flex; flex-direction: column; gap: 12px; }