:root {
  --primary: #0ea5e9;
  --primary-hover: #0284c7;
  --primary-light: #f0f9ff;
  --success: #10b981;
  --success-light: #ecfdf5;
  --success-text: #065f46;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --warning-text: #92400e;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --danger-text: #991b1b;
  --bg-main: #ffffff;      /* Blanco puro */
  --bg-card: #f8fafc;      /* Gris muy suave */
  --text-dark: #0f172a;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -2px rgba(0,0,0,0.05);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-dark);
  min-height: 100vh;
  display: flex;
}

/* Layout */
.app-container {
  display: flex;
  width: 100%;
}

.sidebar {
  width: 260px;
  background-color: var(--bg-card);
  border-right: 1px solid var(--border);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 100;
  transition: box-shadow 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-right-color 0.3s ease;
  overflow-y: auto;
}

.sidebar::-webkit-scrollbar {
  width: 4px;
}
.sidebar::-webkit-scrollbar-track {
  background: transparent;
}
.sidebar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}
.sidebar::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.sidebar:hover {
  box-shadow: 4px 0 24px rgba(2, 132, 199, 0.08);
  border-right-color: rgba(2, 132, 199, 0.15);
}

.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 2rem;
  background-color: var(--bg-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Sidebar Brand */
.brand {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand h2 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}

/* Navigation */
.nav-menu {
  list-style: none;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.nav-item a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--text-muted);
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 500;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-item a i {
  transition: transform 0.3s ease, color 0.3s ease;
}

.nav-item a:hover {
  background-color: var(--primary-light);
  color: var(--primary);
  transform: translateX(6px);
}

.nav-item a:hover i {
  transform: scale(1.15) rotate(5deg);
  color: var(--primary);
}

.nav-item.active a {
  background-color: var(--primary);
  color: #ffffff;
}

.nav-item.active a i {
  color: #ffffff;
}

.nav-footer {
  padding: 1rem;
  border-top: 1px solid var(--border);
}

.logout-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  color: var(--danger);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.logout-btn i {
  transition: transform 0.3s ease;
}

.logout-btn:hover {
  background-color: var(--danger-light);
  transform: translateX(6px);
}

.logout-btn:hover i {
  transform: scale(1.15) rotate(-5deg);
}

/* Content Header */
.content-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.content-title h1 {
  font-size: 1.75rem;
  background: linear-gradient(135deg, #0ea5e9 0%, #0284c7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  letter-spacing: -0.5px;
  display: inline-block;
}

.content-title p {
  color: #0ea5e9;
  font-size: 0.95rem;
  font-weight: 500;
  margin-top: 4px;
}

/* Cards & Grid */
.grid-kpi {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.card-kpi {
  background-color: var(--bg-card);
  padding: 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.card-kpi .label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-kpi .value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-dark);
}

.card-kpi .trend {
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 4px;
}

.card-kpi.primary { border-left: 4px solid var(--primary); }
.card-kpi.success { border-left: 4px solid var(--success); }
.card-kpi.warning { border-left: 4px solid var(--warning); }
.card-kpi.danger { border-left: 4px solid var(--danger); }

/* Main Card Container */
.content-card {
  background-color: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: 2rem;
  margin-bottom: 2rem;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

/* Forms */
.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-dark);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  color: var(--text-dark);
  background-color: #ffffff;
  outline: none;
  transition: border-color 0.2s;
}

select.form-control {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  background-size: 16px;
  padding-right: 40px;
  cursor: pointer;
}

.form-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.1);
}

select.form-control:focus {
  background-color: #ffffff;
}

/* Selector de Padre o Apoderado personalizado (puedes cambiar #ffffff por cualquier color, ej: #f0f9ff para celeste suave) */
#id_apoderado, #edit_id_apoderado {
  background-color: #ffffff; /* Color de fondo personalizado */
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
}

.btn-primary {
  background-color: var(--primary);
  color: #ffffff;
}

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

.btn-secondary {
  background-color: #ffffff;
  border-color: var(--border);
  color: var(--text-dark);
}

.btn-secondary:hover {
  background-color: var(--bg-main);
}

.btn-danger {
  background-color: var(--danger);
  color: #ffffff;
}

.btn-danger:hover {
  background-color: #dc2626;
}

/* Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.table-custom {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.table-custom th {
  background-color: var(--bg-main);
  padding: 12px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border);
  text-transform: uppercase;
}

.table-custom td {
  padding: 16px;
  font-size: 0.95rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-dark);
  vertical-align: middle;
}

.table-custom tr:hover {
  background-color: #fafafa;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  border-radius: 9999px;
  text-transform: uppercase;
}

.badge-activo, .badge-pagado {
  background-color: var(--success-light);
  color: var(--success-text);
}

.badge-retirado, .badge-pendiente {
  background-color: var(--warning-light);
  color: var(--warning-text);
}

.badge-egresado, .badge-vencido {
  background-color: var(--danger-light);
  color: var(--danger-text);
}

/* Alerts */
.alert {
  padding: 16px;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.alert-success {
  background-color: var(--success-light);
  color: var(--success-text);
  border-left: 6px solid var(--success);
}

.alert-danger {
  background-color: var(--danger-light);
  color: var(--danger-text);
  border-left: 6px solid var(--danger);
}

/* Public Portal Styles */
.public-body {
  background: linear-gradient(135deg, #e0f2fe 0%, #bae6fd 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.public-card {
  width: 100%;
  max-width: 480px;
  background-color: var(--bg-card);
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  padding: 2.5rem;
  border: 1px solid rgba(255,255,255,0.8);
}

/* Receipt styles */
.receipt-container {
  width: 100%;
  max-width: 800px;
  background-color: #ffffff;
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 2rem;
  margin: 2rem auto;
}

@media print {
  .no-print {
    display: none !important;
  }
  body {
    background-color: #ffffff;
  }
  .receipt-container {
    border: none;
    padding: 0;
    margin: 0;
}

.btn-whatsapp {
  background-color: #25d366;
  color: #ffffff;
  border-color: #25d366;
}

.btn-whatsapp:hover {
  background-color: #1ebd5b;
  border-color: #1ebd5b;
}

.btn-whatsapp.disabled {
  background-color: #cbd5e1;
  color: #94a3b8;
  border-color: #cbd5e1;
  cursor: not-allowed;
  pointer-events: none;
}