:root {
    --bg-color: #0f172a;
    --sidebar-bg: #1e293b;
    --panel-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #334155;
    --board-border: #475569;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: grid;
    grid-template-columns: 300px 1fr 350px;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    background-color: var(--sidebar-bg);
    padding: 20px;
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 20px;
    overflow-y: auto;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.api-key-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.api-key-section label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.api-key-section input {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--text-primary);
    font-family: monospace;
}

/* Form Elements */
select {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 6px;
    color: var(--text-primary);
    font-family: inherit;
    width: 100%;
    cursor: pointer;
}

select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.settings-box {
    background-color: var(--bg-color);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.settings-box h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.settings-box label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    display: block;
    margin-bottom: 5px;
}

.toggle-container label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-primary);
}

.hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.game-info {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.status-box,
.pgn-box {
    background-color: var(--bg-color);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.status-box h3,
.pgn-box h3 {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#pgn {
    font-family: monospace;
    font-size: 0.875rem;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
}

.controls {
    display: flex;
    gap: 10px;
}

.btn {
    padding: 10px 16px;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
    flex: 1;
}

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

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

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

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

/* Main Content (Board) */
.main-content {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    background-color: var(--bg-color);
    position: relative;
}

/* Chat Panel */
.chat-panel {
    background-color: var(--panel-bg);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

.chat-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.chat-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.chat-messages {
    flex-grow: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
    min-height: 0;
}

.message {
    padding: 12px;
    border-radius: 8px;
    max-width: 90%;
    line-height: 1.5;
    font-size: 0.9375rem;
}

.message.system {
    background-color: var(--bg-color);
    color: var(--text-secondary);
    align-self: center;
    text-align: center;
    font-style: italic;
}

.message.user {
    background-color: var(--accent-color);
    color: white;
    align-self: flex-end;
}

.message.ai {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    align-self: flex-start;
}

.chat-input-area {
    padding: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 10px;
    flex-shrink: 0;
}

textarea {
    flex-grow: 1;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 10px;
    color: var(--text-primary);
    resize: none;
    height: 60px;
    font-family: inherit;
}

textarea:focus {
    outline: none;
    border-color: var(--accent-color);
}

.quick-actions {
    padding: 0 20px 20px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    flex-shrink: 0;
}

.chip {
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 12px;
    border-radius: 16px;
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all 0.2s;
}

.chip:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

@media (max-width: 1024px) {
    .app-container {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr auto;
        overflow-y: auto;
    }

    .sidebar {
        flex-direction: row;
        align-items: center;
        padding: 10px 20px;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        flex-wrap: wrap;
    }

    .game-info,
    .api-key-section {
        display: none;
    }

    .chat-panel {
        height: 400px;
        border-left: none;
        border-top: 1px solid var(--border-color);
    }

    /* Mobile specific adjustments */
    .main-content {
        padding: 10px;
        flex-direction: column;
    }

    .eval-container {
        height: 30px;
        width: 100%;
        max-width: 600px;
        margin-right: 0;
        margin-bottom: 10px;
        flex-direction: row;
    }

    .eval-bar-wrapper {
        flex-direction: row;
    }

    .eval-fill {
        height: 100%;
        transition: width 0.5s ease;
    }

    .eval-fill.black {
        width: 50%;
        height: 100%;
    }

    .eval-fill.white {
        width: 50%;
        height: 100%;
    }

    .eval-score {
        top: 0;
        left: 50%;
        width: auto;
        height: 100%;
        transform: translateX(-50%);
        padding: 0 5px;
        display: flex;
        align-items: center;
    }
}

/* Evaluation Bar Styles */
.eval-container {
    height: 600px;
    /* 與棋盤高度匹配 */
    width: 30px;
    margin-right: 20px;
    display: flex;
    flex-direction: column;
}

.eval-bar-wrapper {
    background-color: #333;
    height: 100%;
    width: 100%;
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
    border: 1px solid var(--border-color);
}

.eval-fill {
    width: 100%;
    transition: height 0.5s ease;
}

.eval-fill.black {
    background-color: #4b5563;
    /* 黑方優勢顏色 */
    height: 50%;
}

.eval-fill.white {
    background-color: #e2e8f0;
    /* 白方優勢顏色 */
    height: 50%;
}

.eval-score {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    text-align: center;
    font-size: 0.75rem;
    font-weight: bold;
    color: #777;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.8);
    padding: 2px 0;
    z-index: 10;
}

/* Move Highlighting */
.highlight-source {
    background-color: rgba(255, 255, 0, 0.4);
}

.highlight-move {
    /* This class is added to the square div */
    position: relative;
}

.highlight-move::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 30%;
    height: 30%;
    background-color: rgba(0, 0, 0, 0.2);
    border-radius: 50%;
    pointer-events: none;
    /* Ensure clicks pass through to the square/piece */
}

/* Prevent scrolling on board for mobile */
#myBoard {
    touch-action: none;
    width: 100%;
    max-width: 600px;
}