:root {
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --danger-color: #ef4444;
  --dark-color: #1f2937;
  --light-bg: #f9fafb;
  --border-color: #e5e7eb;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

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

html {
  font-size: 14px;
  position: relative;
  min-height: 100%;
}

@media (min-width: 768px) {
  html {
    font-size: 16px;
  }
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--light-bg);
  color: var(--dark-color);
  margin-bottom: 60px;
}

/* Navbar */
.navbar {
  background: white !important;
  box-shadow: var(--shadow);
  padding: 1rem 0;
}

.navbar-brand {
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--primary-color) !important;
}

/* Cards */
.card {
  border: none;
  border-radius: 12px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card-header {
  background: white;
  border-bottom: 2px solid var(--border-color);
  font-weight: 600;
  padding: 1.25rem;
}

/* Buttons */
.btn {
  border-radius: 8px;
  padding: 0.5rem 1.25rem;
  font-weight: 500;
  transition: all 0.2s;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
  box-shadow: 0 4px 6px -1px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background: linear-gradient(135deg, var(--primary-hover) 0%, #3730a3 100%);
  box-shadow: 0 6px 12px -2px rgba(79, 70, 229, 0.4);
}

.btn-success {
  background-color: var(--success-color);
  color: white;
}

.btn-success:hover {
  background-color: #059669;
  color: white;
}

.btn-warning {
  background-color: var(--warning-color);
  color: white;
}

.btn-warning:hover {
  background-color: #d97706;
  color: white;
}

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

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

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

/* Icon Buttons */
.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  border: none;
  border-radius: 8px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background-color: transparent;
}

.btn-icon:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn-icon:active {
  transform: translateY(0);
}

.btn-icon-warning {
  background-color: #fef3c7;
  color: #d97706;
}

.btn-icon-warning:hover {
  background-color: #fde68a;
  color: #b45309;
}

.btn-icon-success {
  background-color: #d1fae5;
  color: #059669;
}

.btn-icon-success:hover {
  background-color: #a7f3d0;
  color: #047857;
}

.btn-icon-danger {
  background-color: #fee2e2;
  color: #dc2626;
}

.btn-icon-danger:hover {
  background-color: #fecaca;
  color: #b91c1c;
}

/* Forms */
.form-control, .form-select {
  border-radius: 8px;
  border: 1px solid var(--border-color);
  padding: 0.625rem 0.875rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus, .form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-label {
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--dark-color);
}

/* Table */
.table-container {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  overflow-x: auto;
}

.table {
  margin-bottom: 0;
}

.table thead th {
  background-color: var(--light-bg);
  border-bottom: 2px solid var(--border-color);
  font-weight: 600;
  color: var(--dark-color);
  padding: 1rem;
  white-space: nowrap;
}

.table tbody td {
  padding: 1rem;
  vertical-align: middle;
  border-bottom: 1px solid var(--border-color);
}

.table tbody tr:hover {
  background-color: var(--light-bg);
}

/* Badges */
.badge {
  padding: 0.375rem 0.75rem;
  border-radius: 6px;
  font-weight: 500;
  font-size: 0.875rem;
}

.badge-priority {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.priority-1 { background-color: #dbeafe; color: #1e40af; }
.priority-2 { background-color: #d1fae5; color: #065f46; }
.priority-3 { background-color: #fef3c7; color: #92400e; }
.priority-4 { background-color: #fed7aa; color: #9a3412; }
.priority-5 { background-color: #fee2e2; color: #991b1b; }

.badge-completada { background-color: #d1fae5; color: #065f46; }
.badge-pendiente { background-color: #fef3c7; color: #92400e; }

/* Login Page */
.login-container {
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-card {
  background: white;
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: var(--shadow-lg);
  max-width: 420px;
  width: 100%;
}

.login-logo {
  width: 80px;
  height: 80px;
  margin: 0 auto 1.5rem;
  display: block;
}

/* Header Actions */
.page-header {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-header h2 {
  margin: 0;
  color: var(--dark-color);
  font-size: 1.75rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.user-info {
  color: var(--dark-color);
  font-weight: 500;
}

/* Footer */
.footer {
  background: white;
  border-top: 1px solid var(--border-color);
  padding: 1.5rem 0;
  margin-top: 3rem;
}

/* Alerts */
.alert {
  border-radius: 8px;
  border: none;
  padding: 1rem 1.25rem;
}

/* Responsive */
@media (max-width: 768px) {
  .page-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
  
  .table-container {
    padding: 1rem;
  }
  
  .btn-sm {
    padding: 0.25rem 0.5rem;
    font-size: 0.875rem;
  }
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.3s ease-in;
}