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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f2f5;
    color: #333;
}

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

header {
    background: #075e54;
    color: white;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

header h1 {
    font-size: 24px;
}

nav a {
    color: white;
    text-decoration: none;
    margin-left: 20px;
    padding: 8px 12px;
    border-radius: 4px;
    transition: background 0.3s;
}

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

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

.stat-card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-card h3 {
    color: #666;
    margin-bottom: 10px;
}

.stat-card p {
    font-size: 32px;
    font-weight: bold;
    color: #075e54;
}

form {
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 20px;
}

input, textarea, select, button {
    width: 100%;
    padding: 10px;
    margin: 10px 0;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

button {
    background: #25d366;
    color: white;
    border: none;
    cursor: pointer;
    font-weight: bold;
    transition: background 0.3s;
}

button:hover {
    background: #128c7e;
}

.btn-toggle {
    background: #ffc107;
    color: #333;
}

.btn-delete {
    background: #dc3545;
    color: white;
}

table {
    width: 100%;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    overflow: hidden;
}

th {
    background: #075e54;
    color: white;
    padding: 12px;
    text-align: left;
}

td {
    padding: 12px;
    border-bottom: 1px solid #eee;
}

.qr-container {
    text-align: center;
}

.qr-display {
    margin-top: 30px;
    padding: 20px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#qr-code img {
    max-width: 300px;
    margin: 20px 0;
}

.instructions {
    text-align: left;
    margin-top: 20px;
    padding: 15px;
    background: #f8f9fa;
    border-radius: 4px;
}

.success {
    color: #28a745;
    font-weight: bold;
}

.error {
    color: #dc3545;
    margin-bottom: 10px;
}

.login-container {
    max-width: 400px;
    margin: 100px auto;
    padding: 40px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        text-align: center;
    }
    
    nav {
        margin-top: 15px;
    }
    
    nav a {
        margin: 5px;
        display: inline-block;
    }
}