.decoder-container {
    max-width: 700px;
    margin: 20px auto;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    padding: 20px;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

.decoder-header h2 {
    color: #1800ad;
    margin-bottom: 10px;
}

.decoder-textarea {
    width: 100%;
    height: 120px;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-family: monospace;
    font-size: 13px;
    box-sizing: border-box;
    margin-bottom: 15px;
}

.btn-decode {
    width: 100%;
    padding: 15px;
    background: #1800ad;
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-decode:hover {
    background: #120085;
}

.output-area {
    margin-top: 30px;
    padding: 20px;
    background: #f8f9fa;
    border: 1px solid #eee;
    border-radius: 10px;
}

.customer-info-box {
    background: #eef2ff;
    padding: 15px;
    border-radius: 8px;
    border-left: 6px solid #1800ad;
    margin-bottom: 25px;
}

.tariff-card {
    background: white;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #ddd;
    margin-bottom: 15px;
}

.tariff-card h4 {
    margin: 0 0 10px 0;
    color: #ff7f00;
    border-bottom: 1px solid #eee;
    padding-bottom: 5px;
}

.data-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 5px;
    font-size: 14px;
}

.data-label { font-weight: bold; color: #555; }