body {
    background-color: #EEE;
}

/* Settings Button */
:root {
    --accent: #4A93A2;
    --accent-hover: #3a7a87;
    --accent-disabled: #b0c4c9;
    --move-hover-bg: #e8f4f7;
    --upload-border: #b0c4c9;
    --text-color: #444;
    --text-muted: #888;
    --panel-bg: #fff;
    --panel-border: #d0d0d0;
    --focus-border: #4A93A2;
    --highlight-border: #e6c832;
    --highlight-bg: rgba(74, 147, 162, 0.35);
}

.settings-btn {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 500;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s, transform 0.2s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.settings-btn:hover {
    background: var(--accent-hover);
    transform: rotate(30deg);
}

/* Settings Modal */
.settings-overlay {
    position: fixed;
    inset: 0;
    z-index: 1000;
    background: rgba(0,0,0,0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 1;
    transition: opacity 0.2s;
}

.settings-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

.settings-modal {
    background: #fff;
    border-radius: 12px;
    width: 420px;
    max-width: 90vw;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    transform: scale(1);
    transition: transform 0.2s;
}

.settings-overlay.hidden .settings-modal {
    transform: scale(0.95);
}

.settings-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    border-bottom: 1px solid #e0e0e0;
}

.settings-header h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: #333;
}

.settings-close {
    background: none;
    border: none;
    font-size: 24px;
    color: #888;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    transition: background-color 0.1s, color 0.1s;
}

.settings-close:hover {
    background: #f0f0f0;
    color: #333;
}

.settings-body {
    padding: 20px;
}

.settings-section {
    margin-bottom: 16px;
}

.settings-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #555;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}

/* Theme List */
.theme-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.theme-option {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    cursor: pointer;
    transition: border-color 0.15s, background-color 0.15s;
}

.theme-option:hover {
    border-color: #aaa;
    background-color: #fafafa;
}

.theme-option.active {
    border-color: var(--accent);
    background-color: var(--move-hover-bg);
}

.theme-preview {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 36px;
    height: 36px;
    border-radius: 4px;
    overflow: hidden;
    flex-shrink: 0;
    border: 1px solid rgba(0,0,0,0.1);
}

.theme-preview-square {
    width: 18px;
    height: 18px;
}

.theme-info {
    flex: 1;
}

.theme-name {
    font-size: 14px;
    font-weight: 500;
    color: #333;
}

.theme-pieces {
    display: flex;
    gap: 4px;
    margin-top: 2px;
}

.theme-piece-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 1px solid rgba(0,0,0,0.15);
}

.page-layout {
    display: grid;
    grid-template-columns: 480px 1fr;
    grid-template-rows: 1fr auto;
    column-gap: 24px;
    padding: 0 30px 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.board-container {
    grid-column: 1;
    grid-row: 1;
    min-width: 300px;
}

.board {
    position: relative;
}

.board .board-row {
    position: relative;
    display: flex;
    gap: 0;
    flex-grow: 1;
}

.board-letter-container {
    display: flex;
    color: var(--text-color);
}

.board-letter-container li {
    display: flex;
    justify-content: center;
    flex-grow: 1;
}

.board-number-container {
    display: flex;
    flex-direction: column-reverse;
    position: absolute;
    top: 20px;
    bottom: 0;
    left: -15px;
    color: var(--text-color);
}

.board-number-container li {
    display: flex;
    align-items: center;
    flex-grow: 1;
}

.board .board-square {
    display: flex;
    flex: 1 0 auto;
    aspect-ratio: 1/1;
    position: relative;
    cursor: pointer;
    transition: background-color 0.15s;
}

.board-square-clone {
    position: absolute;
    z-index: 1000;
}

.piece-animate {
    position: absolute;
    z-index: 200;
    pointer-events: none;
    transition: transform 0.3s cubic-bezier(.17,.67,.48,.79);
}

.piece-animate .piece-container {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
}

.piece-fade-in {
    animation: pieceFadeIn 0.15s cubic-bezier(.17,.67,.48,.79) forwards;
}

@keyframes pieceFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.board .board-square .piece-container {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 100;
}

.board .board-square .piece-focus {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
}

.board .board-square.focus .piece-focus {
    border: 2px solid var(--focus-border);
}

.board .board-square .piece {
    width: 100%;
    height: 100%;
}

.board .board-square .piece.pawn {
    width: 60%;
    height: 60%;
}

.board .board-square .piece.rook {
    width: 60%;
    height: 60%;
}

.board .board-square .piece.knight {
    width: 60%;
    height: 60%;
}

.board .board-square .piece.bishop {
    width: 80%;
    height: 80%;
}

.board .board-dark {
    background-color: #000;
}

.board-light {
    background-color: #fff;
}

/* Move highlight */
.board .board-square.highlight-from {
    box-shadow: inset 0 0 0 3px var(--highlight-border);
}

.board .board-square.highlight-to {
    background-color: var(--highlight-bg) !important;
}

/* Captured Pieces */
.captured-pieces {
    display: flex;
    align-items: center;
    gap: 1px;
    min-height: 22px;
    padding: 2px 0;
}

.captured-pieces .captured-piece {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.captured-pieces .captured-piece svg {
    width: 100%;
    height: 100%;
}

.captured-pieces .captured-piece .piece-container {
    position: static;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
}

/* Replay Controls */
.replay-controls {
    grid-column: 1;
    grid-row: 2;
    padding: 12px 0 0;
}

.controls-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.controls-row button {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 4px;
    width: 40px;
    height: 36px;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.15s;
}

.controls-row button:hover:not(:disabled) {
    background: var(--accent-hover);
}

.controls-row button:disabled {
    background: var(--accent-disabled);
    cursor: default;
}

.move-counter {
    margin-left: 8px;
    font-size: 14px;
    color: var(--text-color);
    white-space: nowrap;
}

.speed-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 8px;
    font-size: 13px;
    color: var(--text-color);
}

.speed-row label {
    min-width: 38px;
}

.speed-row input[type="range"] {
    flex: 1;
    max-width: 180px;
    accent-color: var(--accent);
}

#speed-label {
    min-width: 32px;
    text-align: right;
}

/* PGN Upload */
.pgn-upload-area {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 14px 16px;
    margin: 20px auto;
    max-width: 1000px;
    border: 2px dashed var(--upload-border);
    border-radius: 8px;
    transition: border-color 0.15s, background-color 0.15s;
}

.pgn-upload-area.drag-over {
    border-color: var(--accent);
    background-color: rgba(74, 147, 162, 0.08);
}

.pgn-upload-area .upload-btn {
    background: var(--accent);
}

.pgn-upload-area .upload-btn:hover {
    background: var(--accent-hover);
}

/* Side Panel */
.side-panel {
    grid-column: 2;
    grid-row: 1;
    align-self: start;
    min-width: 200px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    overflow: hidden;
    box-sizing: border-box;
}

.upload-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: 4px;
    padding: 8px 20px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.15s;
}

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

.upload-hint {
    font-size: 12px;
    color: var(--text-muted);
}

.game-selector-container {
    display: flex;
    align-items: center;
}

.game-selector-container.hidden {
    display: none;
}

.game-selector {
    padding: 6px 10px;
    font-size: 13px;
    border: 1px solid var(--panel-border);
    border-radius: 4px;
    background: var(--panel-bg);
    color: var(--text-color);
    cursor: pointer;
    max-width: 400px;
    min-width: 200px;
    outline: none;
    transition: border-color 0.15s;
}

.game-selector:hover,
.game-selector:focus {
    border-color: var(--accent);
}

/* Game info */
.game-info {
    grid-column: 2;
    grid-row: 2;
    display: flex;
    flex-direction: column;
    gap: 2px;
    font-size: 13px;
    color: var(--text-color);
    padding: 12px 0 0;
}

.game-players {
    font-weight: bold;
    font-size: 14px;
}

.game-result {
    font-weight: bold;
    color: var(--accent);
}

/* Move list */
.move-list-container {
    flex: 1;
    overflow-y: auto;
    border: 1px solid var(--panel-border);
    border-radius: 6px;
    background: var(--panel-bg);
    min-height: 0;
    opacity: 0.2;
    transition: opacity 0.3s;
}

.move-list-container.loaded {
    opacity: 1;
}

.move-list {
    padding: 8px;
}

.move-row {
    display: flex;
    gap: 0;
    font-size: 13px;
    font-family: monospace;
    color: var(--text-color);
}

.move-number {
    min-width: 32px;
    color: var(--text-muted);
    text-align: right;
    padding-right: 6px;
    user-select: none;
}

.move-item {
    flex: 1;
    padding: 3px 8px;
    cursor: pointer;
    border-radius: 3px;
    transition: background-color 0.1s;
}

.move-item:hover {
    background-color: var(--move-hover-bg);
}

.move-item.current-move {
    background-color: var(--accent);
    color: #fff;
}

/* Move hint */
.move-hint {
    font-size: 13px;
    font-style: italic;
    color: var(--text-muted);
    min-height: 20px;
    padding: 4px 0;
}

/* Responsive */
@media (max-width: 768px) {
    .pgn-upload-area {
        margin: 16px;
    }

    .page-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto auto;
        padding: 0 16px 16px;
    }

    .board-container {
        grid-column: 1;
        width: 100%;
    }

    .replay-controls {
        grid-column: 1;
        grid-row: 2;
    }

    .side-panel {
        grid-column: 1;
        grid-row: 3;
        max-height: 300px;
    }

    .game-info {
        grid-column: 1;
        grid-row: 4;
    }
}