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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

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

h1 {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
    font-size: 2.5em;
}

h2 {
    color: #34495e;
    margin-bottom: 20px;
    border-bottom: 3px solid #667eea;
    padding-bottom: 10px;
}

/* Form Section */
.form-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

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

label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
}

input {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    font-size: 16px;
    transition: border-color 0.3s;
}

input:focus {
    outline: none;
    border-color: #667eea;
}

.btn-generate, .btn-print {
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.btn-generate {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    width: 100%;
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 20px rgba(102, 126, 234, 0.4);
}

.btn-print {
    background: #27ae60;
    color: white;
    margin-top: 20px;
    display: block;
    width: 100%;
}

.btn-print:hover {
    background: #219a52;
}

/* Preview Section */
.preview-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

#previewContainer {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.gelang-preview {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.gelang-header {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
    margin-bottom: 10px;
}

.gelang-nama {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
}

.gelang-barcode img {
    background: white;
    padding: 10px;
    border-radius: 5px;
    max-width: 100%;
}

.gelang-kode {
    margin-top: 10px;
    font-family: monospace;
    font-size: 14px;
    background: rgba(255,255,255,0.2);
    padding: 5px 10px;
    border-radius: 5px;
    display: inline-block;
}

/* Table */
.daftar-tamu {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}

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

th {
    background: #f8f9fa;
    font-weight: 600;
    color: #555;
}

tr:hover {
    background: #f8f9fa;
}

code {
    background: #f4f4f4;
    padding: 3px 8px;
    border-radius: 3px;
    font-family: monospace;
    color: #e74c3c;
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }
    
    h1 {
        font-size: 1.8em;
    }
    
    #previewContainer {
        grid-template-columns: 1fr;
    }
}