:root {
    --bg-color: #2c3e50;
    --board-dark: #7f8c8d;
    --board-light: #ecf0f1;
    --highlight: rgba(241, 196, 15, 0.6);
    --capture: rgba(231, 76, 60, 0.6);
    --special: rgba(52, 152, 219, 0.6);
    --immortal: rgba(142, 68, 173, 0.8);
    --white-piece: #fff;
    --black-piece: #000;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: white;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 20px;
}

h1 { margin-bottom: 5px; }
.subtitle { color: #bdc3c7; margin-bottom: 20px; font-size: 0.9em; }

.game-container {
    display: flex;
    gap: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

/* Chess Board */
#board {
    display: grid;
    grid-template-columns: repeat(8, 80px);
    grid-template-rows: repeat(8, 80px);
    border: 8px solid #34495e;
    user-select: none;
    box-shadow: 0 15px 30px rgba(0,0,0,0.4);
    height: 100%;
}

.cell {
    width: 80px;
    height: 80px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    position: relative;
}

.cell.light { background-color: var(--board-light); }
.cell.dark { background-color: var(--board-dark); }
.cell.selected { background-color: var(--highlight) !important; }
.cell.user-marked-light { background-color: rgba(245, 103, 84, 0.8) !important; }
.cell.user-marked-dark { background-color: rgba(216, 90, 73, 0.8) !important; }

.cell.possible-move::after {
    content: '';
    width: 20px;
    height: 20px;
    background: rgba(0,0,0,0.25);
    border-radius: 50%;
}
.cell.capture { background-color: var(--capture) !important; }
.cell.special-move { background-color: var(--special) !important; }

/* Pieces */
.piece {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2;
    cursor: grab;
    transition: transform 0.2s;
}

.piece img {
    width: 90%;
    height: 90%;
    object-fit: contain;
    filter: drop-shadow(0 4px 4px rgba(0,0,0,0.4));
}

/* Бейджик уровня */
.lvl-badge {
    position: absolute;
    bottom: 4px;
    right: 4px;
    font-size: 12px;
    background: rgba(0,0,0,0.85);
    color: #f1c40f;
    padding: 2px 6px;
    border-radius: 6px;
    pointer-events: none;
    font-weight: bold;
    z-index: 3;
}

/* Sidebar */
.sidebar {
    width: 320px;
    background: rgba(0,0,0,0.2);
    padding: 20px;
    border-radius: 8px;
}

.panel {
    background: rgba(255,255,255,0.1);
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 5px;
}

.turn-indicator {
    font-size: 1.4em;
    font-weight: bold;
    margin-bottom: 10px;
}

.log {
    height: 300px;
    overflow-y: auto;
    font-size: 0.9em;
    font-family: monospace;
    border-top: 1px solid rgba(255,255,255,0.2);
    padding-top: 5px;
    display: flex;
    flex-direction: column-reverse;
}

/* Modal */
#modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85);
    z-index: 100;
    justify-content: center;
    align-items: center;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: #fff;
    color: #333;
    padding: 30px;
    border-radius: 12px;
    max-width: 700px;
    width: 90%;
    text-align: center;
    box-shadow: 0 15px 30px rgba(0,0,0,0.5);
    border: 4px solid #f1c40f;
}

.modal-options {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-top: 20px;
    flex-wrap: wrap;
}

.modal-card {
    border: 2px solid #ddd;
    padding: 15px;
    border-radius: 8px;
    cursor: pointer;
    width: 150px;
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.modal-card:hover {
    background: #fffdf0;
    transform: translateY(-5px);
    border-color: #f1c40f;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.modal-card img {
    width: 60px;
    height: 60px;
    margin-bottom: 10px;
}

.modal-name { font-weight: bold; display: block; margin-bottom: 5px; font-size: 1.1em;}
.modal-desc { font-size: 0.8em; color: #555; line-height: 1.2; }

button.reset-btn {
    background: #e74c3c;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
    font-weight: bold;
    font-size: 1.1em;
}

/* Settings icon */
.settings-icon {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 32px;
    height: 32px;
    cursor: pointer;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.settings-icon:hover {
    background: rgba(255,255,255,0.2);
}

.settings-icon svg {
    width: 20px;
    height: 20px;
    fill: white;
}

button.ai-btn-white {
    background: #3ce79a;
    color: white;
    border: none;
    padding: 12px 12px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
    font-weight: bold;
    font-size: 1.1em;
}

button.ai-btn-black {
    background: #228659;
    color: white;
    border: none;
    padding: 12px 12px;
    border-radius: 5px;
    cursor: pointer;
    margin-top: 10px;
    font-weight: bold;
    font-size: 1.1em;
}

/* Стили для загрузки модов */
.mod-upload-container {
    margin-top: 10px;
    text-align: left;
}
.mod-upload-container input[type="file"] {
    display: none;
}
.mod-upload-label {
    display: inline-block;
    background: #3498db;
    color: white;
    padding: 10px 18px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background 0.2s;
    border-bottom: 3px solid #2980b9;
}
.mod-upload-label:hover {
    background: #2980b9;
}
.mod-upload-label:active {
    transform: translateY(2px);
    border-bottom: none;
}

/* Move Navigation Styles */
.nav-btn {
    background: rgba(255,255,255,0.1);
    color: white;
    border: 1px solid rgba(255,255,255,0.2);
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: all 0.2s;
    min-width: 40px;
}

.nav-btn:hover:not(:disabled) {
    background: rgba(255,255,255,0.2);
    transform: translateY(-1px);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

.nav-btn:active:not(:disabled) {
    transform: translateY(1px);
}

.move-counter {
    color: #f1c40f;
    font-weight: bold;
}

/* Drag and Drop Styles - removed drag-target highlighting */

.piece.draggable {
    cursor: grab !important;
    transition: none;
}

.piece.dragging {
    opacity: 0.8;
    z-index: 1000;
    pointer-events: none;
    position: fixed !important;
    transition: none !important;
    cursor: grabbing !important;
    transform: none !important;
    margin: 0 !important;
    padding: 0 !important;
}

/* Move History Styles - Minimalist */
.move-history {
    max-height: 250px;
    overflow-y: auto;
    font-size: 13px;
    line-height: 1.4;
}

.move-row {
    display: flex;
    align-items: center;
    padding: 2px 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.move-number {
    color: #888;
    font-size: 12px;
    min-width: 20px;
    margin-right: 8px;
    font-weight: bold;
}

.move-white, .move-black {
    flex: 1;
    padding: 3px 6px;
    border-radius: 3px;
    cursor: pointer;
    transition: background-color 0.2s;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-size: 12px;
}

.move-white:hover, .move-black:hover {
    background-color: rgba(52, 152, 219, 0.15);
}

.move-white.current, .move-black.current {
    background-color: rgba(52, 152, 219, 0.3);
    color: #fff;
    font-weight: bold;
}

.move-empty {
    cursor: default;
    background-color: transparent;
}

/* Mobile Responsiveness */
@media (max-width: 1024px) {
    .game-container {
        gap: 20px;
    }

    #board {
        grid-template-columns: repeat(8, 70px);
        grid-template-rows: repeat(8, 70px);
    }

    .cell {
        width: 70px;
        height: 70px;
    }

    .sidebar {
        width: 280px;
    }
}

@media (max-width: 768px) {
    .game-container {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    #board {
        grid-template-columns: repeat(8, 60px);
        grid-template-rows: repeat(8, 60px);
        border-width: 6px;
    }

    .cell {
        width: 60px;
        height: 60px;
    }

    .sidebar {
        width: 100%;
        max-width: 400px;
    }

    .modal-content {
        max-width: 90%;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    #board {
        grid-template-columns: repeat(8, 45px);
        grid-template-rows: repeat(8, 45px);
        border-width: 4px;
        box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    }

    .cell {
        width: 45px;
        height: 45px;
    }

    .game-container {
        gap: 15px;
    }

    .sidebar {
        padding: 15px;
    }

    .settings-icon {
        top: 10px;
        right: 10px;
        width: 28px;
        height: 28px;
    }

    .settings-icon svg {
        width: 16px;
        height: 16px;
    }

    h1 {
        font-size: 1.5em;
        margin-bottom: 2px;
    }

    .subtitle {
        font-size: 0.85em;
        margin-bottom: 15px;
    }
}

/* Coordinate labels */
.coordinate-label-dark {
    position: absolute;
    font-size: 12px;
    font-weight: bold;
    color: #808c8d;
    pointer-events: none;
    z-index: 1;
}
.coordinate-label-light {
    position: absolute;
    font-size: 12px;
    font-weight: bold;
    color: #ecf0f1;
    pointer-events: none;
    z-index: 1;
}

.coordinate-letter {
    bottom: 2px;
    right: 2px;
}

.coordinate-number {
    top: 2px;
    left: 2px;
}

/* King in check highlighting */
.piece.king-in-check {
    filter: drop-shadow(0 0 8px rgba(255, 0, 0, 0.8)) drop-shadow(0 0 16px rgba(255, 0, 0, 0.6));
    animation: king-check-pulse 1.5s ease-in-out infinite alternate;
}

@keyframes king-check-pulse {
    0% { filter: drop-shadow(0 0 8px rgba(255, 0, 0, 0.8)) drop-shadow(0 0 16px rgba(255, 0, 0, 0.6)); }
    100% { filter: drop-shadow(0 0 12px rgba(255, 0, 0, 1.0)) drop-shadow(0 0 24px rgba(255, 0, 0, 0.8)); }
}

/* Position Editor Styles */
#position-editor-modal {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

#editor-board {
    background: var(--bg-color);
}

.editor-cell {
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    position: relative;
    border: 1px solid rgba(255,255,255,0.1);
}

.editor-cell.light {
    background-color: var(--board-light);
}

.editor-cell.dark {
    background-color: var(--board-dark);
}

.editor-cell:hover {
    box-shadow: inset 0 0 0 2px rgba(241, 196, 15, 0.5);
}

.editor-piece {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1;
}

.editor-piece img {
    width: 90%;
    height: 90%;
    object-fit: contain;
    filter: drop-shadow(0 2px 2px rgba(0,0,0,0.3));
}

/* Position Editor Piece Selection */
#piece-selection-panel {
    max-height: 400px;
    overflow-y: auto;
    border: 1px solid #ddd;
    border-radius: 4px;
    padding: 10px;
    background: rgba(255,255,255,0.05);
}

.tier-header {
    color: #f1c40f;
    font-size: 14px;
    font-weight: bold;
    margin: 10px 0 5px 0;
    text-align: center;
    border-bottom: 1px solid rgba(241, 196, 15, 0.3);
    padding-bottom: 3px;
}

.tier-pieces {
    display: flex;
    flex-wrap: wrap;
    gap: 2px;
    margin-bottom: 15px;
    justify-content: center;
}

.piece-selection-btn {
    width: 44px;
    height: 44px;
    border: 1px solid #ddd;
    border-radius: 4px;
    background: rgba(255,255,255,0.1);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
    position: relative;
}

.piece-selection-btn:hover {
    background: rgba(255,255,255,0.2);
    transform: scale(1.05);
    border-color: #f1c40f;
}

.piece-selection-btn[selected] {
    border-color: #f1c40f;
    background: rgba(241, 196, 15, 0.2);
    box-shadow: 0 0 8px rgba(241, 196, 15, 0.4);
}

.piece-selection-btn img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

/* Responsive design for piece selection */
@media (max-width: 768px) {
    #piece-selection-panel {
        max-height: 350px;
    }

    .piece-selection-btn {
        width: 40px;
        height: 40px;
    }

    .piece-selection-btn img {
        width: 28px;
        height: 28px;
    }
}