:root {
  /* Colors */
  --primary: #4F46E5;
  --primary-hover: #4338CA;
  --secondary: #10B981;
  --secondary-hover: #059669;
  --danger: #EF4444;
  --danger-hover: #DC2626;
  --dark: #1F2937;
  --light: #F3F4F6;
  --white: #FFFFFF;
  --gray: #9CA3AF;
  
  /* Background/Glassmorphism */
  --bg-gradient: linear-gradient(135deg, #fdfbfb 0%, #ebedee 100%);
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.2);
  --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.07);

  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 20px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

body {
  background: var(--bg-gradient);
  color: var(--dark);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  color: var(--dark);
  margin-bottom: var(--spacing-md);
}

/* Utilities */
.text-center { text-align: center; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.text-danger { color: var(--danger); }
.text-success { color: var(--secondary); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  border-radius: var(--radius-md);
  border: none;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 0.95rem;
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--primary);
  color: white;
  box-shadow: 0 4px 6px rgba(79, 70, 229, 0.2);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  transform: translateY(-1px);
}

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

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

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

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

/* Inputs & Form Controls */
.form-group {
  margin-bottom: var(--spacing-lg);
  text-align: left;
}

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
  color: #4B5563;
  font-size: 0.9rem;
}

.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid #D1D5DB;
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  font-size: 1rem;
}

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

/* Glassmorphism Container */
.glass-panel {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
}

/* Layouts */
.auth-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-md);
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

.auth-header {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.auth-logo {
  width: 60px;
  height: 60px;
  background: var(--primary);
  color: white;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: var(--spacing-md);
  box-shadow: 0 4px 15px rgba(79, 70, 229, 0.3);
}

/* Dashboard Layout */
.app-header {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--glass-border);
  position: sticky;
  top: 0;
  z-index: 50;
  padding: var(--spacing-md) var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: var(--glass-shadow);
}

.header-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}

.header-actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-xl) var(--spacing-md);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

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

/* Modals */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal-content {
  width: 90%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  transform: translateY(20px);
  transition: all 0.3s ease;
}

.modal-overlay.active .modal-content {
  transform: translateY(0);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  border-bottom: 1px solid #E5E7EB;
  padding-bottom: var(--spacing-md);
}

.btn-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray);
}

.btn-close:hover {
  color: var(--danger);
}

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

.table {
  width: 100%;
  border-collapse: collapse;
  white-space: nowrap;
}

.table th, .table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid #E5E7EB;
}

.table th {
  background-color: #F9FAFB;
  font-weight: 600;
  color: #4B5563;
}

.table tr:hover {
  background-color: #F9FAFB;
}

/* Alerts / Notifications */
.alert {
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
  font-size: 0.95rem;
}
.alert-error {
  background-color: #FEE2E2;
  color: #991B1B;
  border: 1px solid #F87171;
}
.alert-success {
  background-color: #D1FAE5;
  color: #065F46;
  border: 1px solid #34D399;
}

/* ===== GIỚI HẠN CHIỀU CAO VÀ LÀM ĐẸP THANH CUỘN GIỎ HÀNG ===== */
.cart-scroll {
    max-height: 380px; /* Giới hạn chiều cao (khoảng 5-6 sản phẩm) */
    overflow-y: auto;  /* Bật cuộn dọc khi quá dài */
    overflow-x: hidden; /* Tắt cuộn ngang */
    padding-right: 5px; /* Chừa 1 chút lề cho thanh cuộn không đè lên nút Xóa */
}

/* Tùy chỉnh giao diện thanh cuộn (Chỉ chạy trên Chrome/Edge/Safari) */
.cart-scroll::-webkit-scrollbar {
    width: 6px; /* Thanh cuộn nhỏ gọn */
}
.cart-scroll::-webkit-scrollbar-track {
    background: #f8fafc; 
    border-radius: 4px;
}
.cart-scroll::-webkit-scrollbar-thumb {
    background: #cbd5e1; 
    border-radius: 4px;
}
.cart-scroll::-webkit-scrollbar-thumb:hover {
    background: #94a3b8; /* Đậm hơn khi di chuột vào */
}