:root {
    --primary-color: #4CAF50;
    --secondary-color: #2196F3;
    --danger-color: #f44336;
    --success-color: #4CAF50;
    --warning-color: #ff9800;
    --text-color: #ffffff;
    --text-secondary: #b0b0b0;
    --background-primary: #1a1a1a;
    --background-secondary: #2d2d2d;
    --background-tertiary: #333333;
    --border-color: #404040;
    --card-positive: #4CAF50;
    --card-negative: #f44336;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-primary);
    color: var(--text-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: var(--text-color);
    font-size: 2.5em;
    margin: 0;
}

main {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.strategy-form {
    background: var(--background-secondary);
    padding: 20px;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 15px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 15px;
}

label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-color);
}

input[type="date"],
input[type="number"],
select {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--background-tertiary);
    color: var(--text-color);
}

input[type="date"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
}

.form-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 20px;
}

.btn-primary,
.btn-secondary {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.3s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

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

.btn-primary:hover {
    background: #45a049;
}

.btn-secondary:hover {
    background: var(--background-primary);
}

.loading-container {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    background: var(--background-secondary);
    border-radius: 8px;
    text-align: center;
}

.loading-spinner {
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top: 4px solid var(--primary-color);
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.results-container {
    display: flex;
    visibility: hidden;
    flex-direction: column;
    gap: 30px;
    width: 100%;
}

.backtest-results,
.signals-results,
.chart-container {
    background: var(--background-secondary);
    padding: 20px;
    border-radius: 8px;
}

.price-chart {
    width: 100%;
    height: 600px;
    margin-top: 20px;
    position: relative;
    border-radius: 4px;
    /* 确保图表内容可见 */
    overflow: visible;
}

.result-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.result-card {
    background: var(--background-tertiary);
    padding: 15px;
    border-radius: 6px;
    text-align: center;
}

.result-card h3 {
    font-size: 1em;
    margin-bottom: 10px;
    color: var(--text-secondary);
}

.result-card p {
    font-size: 1.8em;
    font-weight: bold;
}

.positive {
    color: var(--card-positive);
}

.negative {
    color: var(--card-negative);
}

.signals-table-container {
    overflow-x: auto;
    margin-top: 20px;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table th,
table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

table th {
    background: var(--background-tertiary);
    color: var(--text-color);
    font-weight: bold;
}

table tbody tr:hover {
    background: var(--background-tertiary);
}

.buy-signal {
    color: var(--card-positive);
}

.sell-signal {
    color: var(--card-negative);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding: 20px 0;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
}

@media (max-width: 768px) {
    .form-row {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .result-cards {
        grid-template-columns: 1fr;
    }
}