:root {
    --shu-xanh-huu-co: #1e5631;
    --shu-do-ruby: #e17055;
    --shu-charcoal: #2d3436;
    --shu-nen-sang: #f5f6fa;
}
.shu-data-container {
    font-family: 'Arial', sans-serif;
    max-width: 450px;
    margin: 40px auto;
    padding: 30px;
    background: #ffffff;
    border-radius: 14px;
    border: 2px solid var(--shu-xanh-huu-co);
    box-shadow: 0 10px 30px rgba(30, 86, 49, 0.08);
}
.shu-card-header {
    text-align: center;
    margin-bottom: 25px;
    border-bottom: 2px dashed #dfe6e9;
    padding-bottom: 15px;
}
.shu-card-header h2 {
    color: var(--shu-xanh-huu-co);
    font-size: 22px;
    margin: 0 0 8px 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.shu-card-header p {
    color: #636e72;
    font-size: 14px;
    margin: 0;
}
.shu-input-group {
    margin-bottom: 20px;
    text-align: left;
}
.shu-input-group label {
    display: block;
    font-size: 14px;
    font-weight: bold;
    color: var(--shu-charcoal);
    margin-bottom: 6px;
}
.shu-input-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-size: 15px;
    outline: none;
    box-sizing: border-box;
}
.shu-input-group input:focus {
    border-color: var(--shu-do-ruby);
    box-shadow: 0 0 5px rgba(225, 112, 85, 0.3);
}
.shu-btn-submit {
    width: 100%;
    background: var(--shu-do-ruby);
    color: #ffffff;
    border: none;
    padding: 14px;
    font-size: 16px;
    font-weight: bold;
    border-radius: 6px;
    cursor: pointer;
    text-transform: uppercase;
    box-sizing: border-box;
}
.shu-btn-submit:hover {
    background: #d63031;
}
.shu-error-alert {
    background: #fff0f0;
    color: #d63031;
    padding: 12px;
    border-radius: 6px;
    margin-bottom: 20px;
    font-size: 14px;
    border: 1px solid #ffcccc;
    text-align: left;
}
.shu-result-box {
    padding: 20px;
    background: var(--shu-nen-sang);
    border-radius: 8px;
    border: 1px solid #ddd;
    text-align: center;
}
.shu-success-badge {
    color: #2ecc71;
    font-weight: bold;
    font-size: 16px;
    margin-bottom: 10px;
}
.shu-voucher-display {
    margin: 15px 0;
    padding: 15px;
    background: #ffffff;
    border: 2px dashed var(--shu-do-ruby);
    border-radius: 6px;
}
.shu-voucher-label {
    font-size: 12px;
    color: #7f8c8d;
    font-weight: bold;
    display: block;
    margin-bottom: 5px;
}
.shu-voucher-code {
    font-size: 26px;
    font-weight: bold;
    color: var(--shu-xanh-huu-co);
    letter-spacing: 2px;
}
.shu-note {
    font-size: 11px;
    color: #95a5a6;
    font-style: italic;
    margin: 0;
}