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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

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

/* Header Styles */
header {
    background: white;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    padding: 1rem 0;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: #667eea;
}

.nav-links a {
    margin-left: 20px;
    text-decoration: none;
    color: #333;
    transition: color 0.3s;
}

.nav-links a:hover {
    color: #667eea;
}

/* Form Styles */
.form-container {
    max-width: 400px;
    margin: 50px auto;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

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

label {
    display: block;
    margin-bottom: 5px;
    color: #333;
    font-weight: 500;
}

input, select, textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

button, .btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 30px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: transform 0.3s;
    text-decoration: none;
    display: inline-block;
}

button:hover, .btn:hover {
    transform: translateY(-2px);
}

/* Dashboard Styles */
.dashboard {
    display: grid;
    grid-template-columns: 250px 1fr;
    gap: 20px;
    margin-top: 20px;
}

.sidebar {
    background: white;
    border-radius: 10px;
    padding: 20px;
    height: fit-content;
}

.sidebar h3 {
    margin-bottom: 15px;
    color: #667eea;
}

.sidebar a {
    display: block;
    padding: 10px;
    color: #333;
    text-decoration: none;
    margin-bottom: 5px;
    border-radius: 5px;
    transition: background 0.3s;
}

.sidebar a:hover, .sidebar a.active {
    background: #667eea;
    color: white;
}

.main-content {
    background: white;
    border-radius: 10px;
    padding: 20px;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
}

.stat-card h3 {
    font-size: 14px;
    margin-bottom: 10px;
    opacity: 0.9;
}

.stat-card .value {
    font-size: 32px;
    font-weight: bold;
}

/* Table Styles */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

th, td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}

th {
    background: #f5f5f5;
    font-weight: 600;
}

tr:hover {
    background: #f9f9f9;
}

/* Item Grid */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.item-card {
    border: 1px solid #ddd;
    border-radius: 10px;
    padding: 15px;
    transition: transform 0.3s;
}

.item-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.item-card h3 {
    color: #667eea;
    margin-bottom: 10px;
}

.item-card .price {
    font-size: 20px;
    font-weight: bold;
    color: #764ba2;
    margin: 10px 0;
}

/* Alert Messages */
.alert {
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}

.alert-success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    nav {
        flex-direction: column;
        gap: 10px;
    }
    
    .nav-links a {
        margin: 0 10px;
    }
}