:root {
    --primary: #6c5ce7;
    --primary-hover: #5b4dd1;
    --bg-light: #f5f6fa;
    --border-color: #e4e6ef;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
}



.display-5 {
    font-size: 1.75rem !important;
    margin-bottom: 0.25rem;
    background: linear-gradient(45deg, var(--primary), var(--primary-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card {
    border-radius: 12px;
    background: #ffffff !important;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.02);
}

.card-body {
    padding: 1.25rem;
}

h6 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.input-group {
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.input-group-text {
    background: #ffffff;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.875rem;
    min-width: 70px;
    justify-content: center;
}

.form-control, .form-select {
    border: 1px solid var(--border-color);
    font-size: 0.95rem;
    padding: 0.5rem 0.75rem;
    color: var(--text-primary);
}

/* 禁用所有元素的focus状态 */
*:focus {
    outline: none !important;
    box-shadow: none !important;
    border-color: var(--border-color) !important;
}

/* 禁用所有按钮的focus状态 */
.btn {
    outline: none !important;
}

.btn:focus {
    box-shadow: none !important;
}

.btn-check:focus + .btn-outline-primary {
    box-shadow: none !important;
    border-color: var(--border-color) !important;
}

.btn-check:active + .btn-outline-primary {
    box-shadow: none !important;
}

.btn-group {
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.btn-outline-primary {
    color: var(--primary);
    border-color: var(--border-color);
    background-color: #ffffff;
}

.btn-outline-primary:hover {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

.btn-check:checked + .btn-outline-primary {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

.btn-primary {
    background-color: var(--primary);
    border: none;
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
}

.btn-primary:hover {
    background-color: var(--primary-hover) !important;
}

.btn-light {
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-light:hover {
    background-color: #e9ecef;
}

.result-card {
    background-color: var(--bg-light);
    border-radius: 8px;
    padding: 1rem;
}

.history-item {
    background: #ffffff;
    border-radius: 8px;
    padding: 0.75rem;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
}

.history-item:last-child {
    margin-bottom: 0;
}

.history-item .info {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.history-item .result {
    color: var(--primary);
    font-weight: 600;
    font-size: 1.1rem;
}

.history-item .formula {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

footer {
    margin-top: 1rem;
    color: var(--text-secondary);
}

@media (min-width: 768px) {

}