:root {
    --primary-color: #2ecc71;
    --secondary-color: #27ae60;
    --dark-color: #2c3e50;
    --light-bg: #f4f7f6;
    --white: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    margin: 0;
}

.navbar {
    background-color: var(--dark-color);
    padding: 1rem 2rem;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
}

.sidebar {
    width: 240px;
    height: 100vh;
    background: var(--dark-color);
    position: fixed;
    padding-top: 20px;
}

.sidebar a {
    padding: 15px 25px;
    display: block;
    color: #bdc3c7;
    text-decoration: none;
    transition: 0.3s;
}

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

.main-content {
    margin-left: 240px;
    padding: 30px;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

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

.stat-card {
    padding: 20px;
    border-left: 5px solid var(--primary-color);
}

.stat-card h3 { margin: 0; font-size: 14px; color: #7f8c8d; }
.stat-card h2 { margin: 10px 0 0; font-size: 24px; color: var(--dark-color); }

table {
    width: 100%;
    border-collapse: collapse;
}

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

th { background-color: #f8f9fa; }

.btn {
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
}

.btn-primary { background: var(--primary-color); color: white; }
.btn-danger { background: #e74c3c; color: white; }

.login-container {
    max-width: 400px;
    margin: 100px auto;
}

.badge {
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 12px;
}
.bg-success { background: #d4edda; color: #155724; }
.bg-warning { background: #fff3cd; color: #856404; }
.bg-danger { background: #f8d7da; color: #721c24; }

input, select, textarea {
    width: 100%;
    padding: 10px;
    margin: 8px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    box-sizing: border-box;
}

.pos-table input {
    width: 80px;
}