.card {
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
}
.card-header {
    background: linear-gradient(90deg, #4b6cb7 0%, #182848 100%);
    color: white;
    font-weight: bold;
}
.calculator-icon {
    font-size: 24px;
    margin-right: 10px;
}
.result-card {
    background-color: #f8f9fa;
    border-left: 4px solid #4b6cb7;
}
.btn-calculate {
    background: linear-gradient(90deg, #4b6cb7 0%, #182848 100%);
    border: none;
    color: white;
    font-weight: bold;
}
.btn-calculate:hover {
    background: linear-gradient(90deg, #182848 0%, #4b6cb7 100%);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}
.date-type-btn {
    background-color: #e9ecef;
    border: 1px solid #ced4da;
}
.date-type-btn.active {
    background: linear-gradient(90deg, #4b6cb7 0%, #182848 100%);
    color: white;
}
.result-table {
    width: 100%;
    border-collapse: collapse;
}
.result-table th {
    background-color: #4b6cb7;
    color: white;
    padding: 10px;
    text-align: left;
}
.result-table td {
    padding: 12px;
    border-bottom: 1px solid #dee2e6;
}
.result-table tr:nth-child(even) {
    background-color: #f2f2f2;
}
.copy-btn {
    cursor: pointer;
    color: #4b6cb7;
    margin-left: 5px;
}
.copy-btn:hover {
    color: #182848;
}