/* AdminAI - Main Stylesheet */
:root {
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --secondary: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --dark: #1f2937;
  --light: #f3f4f6;
  --white: #ffffff;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --radius: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
  font-family: 'Sarabun', 'Segoe UI', sans-serif;
  background: var(--gray-100);
  color: var(--gray-800);
  line-height: 1.6;
}

/* Layout */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: var(--white);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-lg);
}

.header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--white);
}

.logo img {
  height: 40px;
}

.nav {
  display: flex;
  gap: 20px;
}

.nav a {
  color: var(--white);
  text-decoration: none;
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: background 0.2s;
}

.nav a:hover, .nav a.active {
  background: rgba(255,255,255,0.2);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #818cf8 100%);
  color: var(--white);
  padding: 80px 0;
  text-align: center;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
}

.hero p {
  font-size: 1.25rem;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto 30px;
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background: var(--gray-100);
}

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

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

/* Cards */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-bottom: 20px;
}

.card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 1px solid var(--gray-200);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--gray-800);
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--gray-700);
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-size: 1rem;
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
}

textarea.form-control {
  min-height: 120px;
  resize: vertical;
}

select.form-control {
  cursor: pointer;
}

.form-help {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-top: 5px;
}

/* Grid */
.grid {
  display: grid;
  gap: 20px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
}

/* Dashboard Layout */
.dashboard {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--gray-800);
  color: var(--white);
  padding: 20px 0;
  position: fixed;
  height: 100vh;
  overflow-y: auto;
}

.sidebar-logo {
  padding: 10px 20px 30px;
  font-size: 1.25rem;
  font-weight: 700;
  border-bottom: 1px solid var(--gray-700);
  margin-bottom: 20px;
}

.sidebar-menu a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 20px;
  color: var(--gray-300);
  text-decoration: none;
  transition: all 0.2s;
}

.sidebar-menu a:hover, .sidebar-menu a.active {
  background: var(--gray-700);
  color: var(--white);
}

.sidebar-menu a i {
  width: 20px;
  text-align: center;
}

.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 30px;
}

@media (max-width: 1024px) {
  .sidebar {
    width: 100%;
    height: auto;
    position: relative;
  }
  .main-content {
    margin-left: 0;
  }
  .dashboard {
    flex-direction: column;
  }
}

/* Tables */
.table {
  width: 100%;
  border-collapse: collapse;
}

.table th, .table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.table th {
  background: var(--gray-50);
  font-weight: 600;
  color: var(--gray-700);
}

.table tr:hover {
  background: var(--gray-50);
}

/* Status Badges */
.badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.badge-success {
  background: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

/* Alerts */
.alert {
  padding: 16px 20px;
  border-radius: var(--radius);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.alert-success {
  background: #d1fae5;
  color: #065f46;
  border: 1px solid #a7f3d0;
}

.alert-error {
  background: #fee2e2;
  color: #991b1b;
  border: 1px solid #fecaca;
}

.alert-info {
  background: #dbeafe;
  color: #1e40af;
  border: 1px solid #bfdbfe;
}

/* Stats Cards */
.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
}

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  color: var(--gray-500);
  font-size: 0.875rem;
}

/* Features Section */
.features {
  padding: 80px 0;
}

.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: var(--primary);
  color: var(--white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  font-size: 1.5rem;
}

.feature-title {
  font-size: 1.25rem;
  margin-bottom: 10px;
  color: var(--gray-800);
}

/* Footer */
.footer {
  background: var(--gray-800);
  color: var(--gray-300);
  padding: 40px 0;
  text-align: center;
}

/* Utility */
.text-center { text-align: center; }
.text-right { text-align: right; }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.hidden { display: none; }

/* Loading */
.loading {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--gray-300);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Tabs */
.tabs {
  display: flex;
  border-bottom: 2px solid var(--gray-200);
  margin-bottom: 20px;
}

.tab {
  padding: 12px 24px;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: all 0.2s;
}

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

.tab.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 600;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}