/* Sistema de Certificados - Estilo Moderno Claro */
:root {
  --panel: #ffffff;
  --panel-light: #f9fafb;
  --muted: #6b7280;
  --text: #1f2937;
  --text-bright: #111827;
  --primary: #3b82f6;
  --primary-dark: #2563eb;
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.1);
  --error: #ef4444;
  --error-bg: rgba(239, 68, 68, 0.1);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.1);
  --info: #3b82f6;
  --info-bg: rgba(59, 130, 246, 0.1);
  --border: #e5e7eb;
  --bg-dark: #f3f4f6; /* Se llama bg-dark por legacy pero ahora es claro */
  --bg-darker: #ffffff;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  color: var(--text);
  font-family: 'Inter', system-ui, sans-serif;
  min-height: 100vh;
  /* Fondo activado */
  background: url('bg.jpg') center/cover fixed no-repeat;
}

/* 
  Overlay para asegurar excelente lectura de la tarjeta
*/
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background: rgba(0, 0, 0, 0.25); /* Capa osucra para enmarcar el fondo claro */
  backdrop-filter: blur(4px); /* Ligero desenfoque al fondo */
  -webkit-backdrop-filter: blur(4px);
}

.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

.card {
  background: rgba(248, 250, 252, 0.95); /* Un puntito más oscuro que el blanco puro */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid rgba(200, 200, 200, 0.6);
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2), 0 8px 10px -6px rgba(0, 0, 0, 0.15);
}

/* Topbar */
.topbar {
  display: flex;
  gap: 12px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
}

.topbar h1 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.5px;
  font-size: clamp(20px, 2.4vw, 24px);
  color: var(--text-bright);
}

.links {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.links a {
  color: var(--text);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  transition: all 0.2s ease;
}

.links a:hover {
  background: var(--bg-dark);
  color: var(--primary);
}

.links a.logout {
  color: var(--error);
}

.links a.logout:hover {
  background: var(--error-bg);
}

/* Buscar / Filtrar */
.searchBar {
  position: relative;
  flex: 1;
  min-width: 260px;
}

.searchBar input {
  width: 100%;
  padding: 12px 14px 12px 44px;
  border-radius: 8px;
  border: 1px solid #d1d5db; /* Borde un poco mas marcado */
  background: #f1f5f9; /* Fondo gris claro / azulado sutil */
  color: var(--text-bright);
  outline: none;
  font-size: 14px;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.searchBar input:focus {
  border-color: var(--primary);
  background: #ffffff; /* Cuando le de click se vuelve blanco de nuevo */
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.searchIcon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  opacity: 0.5;
  color: var(--muted);
}

/* Botones */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text-bright);
  cursor: pointer;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

.btn:hover {
  background: var(--bg-dark);
  border-color: #d1d5db;
}

.btn--primary {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary-dark);
}

.btn--primary:hover {
  background: var(--primary-dark);
  color: #fff;
}

.btn--danger {
  background: #fff;
  border-color: var(--error);
  color: var(--error);
}

.btn--danger:hover {
  background: var(--error-bg);
}

.btn--sm {
  padding: 4px 10px;
  font-size: 13px;
}

/* Tables */
.table-responsive {
  overflow-x: auto;
  border-radius: 8px;
  border: 1px solid var(--border);
  box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  text-align: left;
}

thead th {
  font-weight: 600;
  font-size: 13px;
  color: var(--muted);
  padding: 12px 16px;
  background: var(--panel-light);
  border-bottom: 2px solid var(--border);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

tbody td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  color: var(--text-bright);
}

tbody tr:last-child td {
  border-bottom: none;
}

tbody tr:hover {
  background: #f8fafc;
}

/* Forms */
.form-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 16px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
}

.form-group label {
  margin-bottom: 6px;
  font-size: 13px;
  color: var(--text-bright);
  font-weight: 600;
}

.form-group input,
.form-group select,
.form-group textarea {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  background: #f1f5f9; /* Gris sutil */
  color: var(--text-bright);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  background: #ffffff; /* Al enfocar vuelve a blanco */
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Badges */
.badge {
  display: inline-block;
  padding: 4px 10px;
  border-radius: 20px;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
}

.code-badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 4px;
  background: var(--panel-light);
  border: 1px solid var(--border);
  font-family: 'Consolas', monospace;
  font-size: 13px;
  color: var(--text-bright);
}

.expired-badge {
  color: var(--error);
  font-weight: 600;
}

.expired-row {
  background: #fff1f2 !important;
}

.empty {
  padding: 40px;
  text-align: center;
  color: var(--muted);
  background: rgba(241, 245, 249, 0.6); /* Gris super transparente */
  border: 1px dashed #cbd5e1;
  border-radius: 8px;
}

.flash {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  font-size: 14px;
  font-weight: 500;
}

.flash--success { background: #ecfdf5; color: #065f46; border: 1px solid #10b981; }
.flash--error { background: #fef2f2; color: #991b1b; border: 1px solid #ef4444; }

.flash__close {
  background: none; border: none; font-size: 16px; margin-left:auto; cursor: pointer; color: inherit; opacity: 0.7;
}

.admin-actions {
  display: flex;
  gap: 12px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.hidden { display: none !important; }

/* Login Form Center */
.login-form {
  max-width: 380px;
  margin: 40px auto;
}

.auth-links {
  display: flex;
  justify-content: center;
  gap: 12px;
}