body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, sans-serif;
    background: #f4f6fa;
}

.header {
    background: #0a1f44;
    padding: 30px 20px;
    text-align: center;
    color: white;
}

.header img {
    max-width: 220px;
    margin-bottom: 10px;
}

.container {
    max-width: 650px;
    margin: 40px auto;
    background: white;
    padding: 35px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

.notice {
    background: #eef4ff;
    border-left: 6px solid #1d4ed8;
    padding: 18px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.payment-box {
    background: #f9fafc;
    padding: 25px;
    border-radius: 10px;
    text-align: center;
    border: 1px solid #e3e8f0;
}

.qr-image {
    width: 200px;
    margin: 15px auto;
    display: block;
}

.copy-btn, .download-btn {
    margin: 8px 5px;
    padding: 10px 14px;
    background: #1d4ed8;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
}

.copy-btn:hover, .download-btn:hover {
    background: #163ea5;
}

.button {
    display: block;
    text-align: center;
    padding: 14px;
    margin-top: 30px;
    background-color: #1877f2;
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: bold;
}

.footer {
    text-align: center;
    font-size: 13px;
    color: #777;
    margin-top: 30px;
}