:root {
    --background-light: #f0f2f5;
    --text-light: #333;
    --container-bg-light: #fff;
    --border-light: #ddd;
    --buy-color: #d24f45;
    --sell-color: #1261c4;

    --background-dark: #1a1a1a;
    --text-dark: #f0f0f0;
    --container-bg-dark: #2a2a2a;
    --border-dark: #444;
}

body {
    font-family: 'Arial', sans-serif;
    transition: background-color 0.3s, color 0.3s;
}

.light-theme {
    background-color: var(--background-light);
    color: var(--text-light);
}

.dark-theme {
    background-color: var(--background-dark);
    color: var(--text-dark);
}

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

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.chart-container {
    margin-bottom: 20px;
}

.trading-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.orderbook-container {
    border: 1px solid var(--border-light);
    border-radius: 5px;
    padding: 10px;
}

.dark-theme .orderbook-container {
    border-color: var(--border-dark);
}

.orderbook-row {
    display: flex;
    justify-content: space-between;
    padding: 4px 8px;
    margin: 2px 0;
    border-radius: 3px;
}

.orderbook-row.buy {
    background-color: rgba(210, 79, 69, 0.1);
}

.orderbook-row.sell {
    background-color: rgba(18, 97, 196, 0.1);
}

.price {
    font-weight: bold;
}

.price.buy-price { color: var(--buy-color); }
.price.sell-price { color: var(--sell-color); }

.trading-interface {
    border: 1px solid var(--border-light);
    border-radius: 5px;
    padding: 20px;
}

.dark-theme .trading-interface {
    border-color: var(--border-dark);
}

.trade-mode-selector {
    display: flex;
    margin-bottom: 15px;
}

.trade-mode-selector button {
    flex: 1;
    padding: 10px;
    border: none;
    background-color: transparent;
    cursor: pointer;
    font-size: 16px;
    border-bottom: 2px solid transparent;
}

.trade-mode-selector button.active {
    font-weight: bold;
    border-bottom: 2px solid;
}

#buy-mode-btn.active { color: var(--buy-color); border-color: var(--buy-color); }
#sell-mode-btn.active { color: var(--sell-color); border-color: var(--sell-color); }

.balance-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
    color: #888;
}

.trade-input-group {
    margin-bottom: 15px;
}

.trade-input-group label {
    display: block;
    margin-bottom: 5px;
    font-size: 14px;
    color: #555;
}

.dark-theme .trade-input-group label { color: #aaa; }

.price-input input, .trade-input-group input {
    width: 100%;
    padding: 8px;
    border: 1px solid var(--border-light);
    border-radius: 4px;
    background-color: #f9f9f9;
}

.dark-theme .price-input input, .dark-theme .trade-input-group input {
    border-color: var(--border-dark);
    background-color: #333;
    color: var(--text-dark);
}

.percentage-selector {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

.percentage-selector button {
    flex: 1;
    margin: 0 2px;
    padding: 8px 0;
    border: 1px solid var(--border-light);
    background-color: #fff;
    cursor: pointer;
}

.dark-theme .percentage-selector button {
    background-color: var(--container-bg-dark);
    border-color: var(--border-dark);
    color: var(--text-dark);
}

.trade-total-group {
    display: flex;
    justify-content: space-between;
    margin-bottom: 20px;
}

#execute-trade-btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 5px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
}

#execute-trade-btn.buy { background-color: var(--buy-color); }
#execute-trade-btn.sell { background-color: var(--sell-color); }

.simulation-controls {
    margin-top: 20px;
    padding: 20px;
    border: 1px solid var(--border-light);
    border-radius: 5px;
}

.dark-theme .simulation-controls {
    border-color: var(--border-dark);
}