/* Threes Web - Styles */

:root {
    --bg-color: #f5f5f5;
    --board-bg: #bbada0;
    --cell-bg: #cdc1b4;
    --tile-1-bg: #a3cedc;
    --tile-1-text: #ffffff;
    --tile-2-bg: #ff8080;
    --tile-2-text: #ffffff;
    --tile-high-bg: #eee4da;
    --tile-3-text: #776e65;
    --tile-high-text: #f65e3b;
    --text-color: #776e65;
    --header-bg: #faf8ef;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
    overflow: hidden;
    touch-action: none;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    user-select: none;
    -webkit-user-select: none;
}

/* Header */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 500px;
    padding: 10px 20px;
    margin-bottom: 10px;
}

.title {
    font-size: 2rem;
    font-weight: bold;
    color: var(--tile-high-text);
}

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

.score-box {
    background: var(--board-bg);
    padding: 8px 16px;
    border-radius: 6px;
    text-align: center;
    min-width: 80px;
}

.score-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: #eee4da;
}

.score-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: white;
}

/* Game wrapper - contains board and AI sidebar */
.game-wrapper {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 20px;
    width: 100%;
    max-width: 700px;
    padding: 0 20px;
}

/* Game container */
.game-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: 400px;
    flex-shrink: 0;
}

/* AI Sidebar */
.ai-sidebar {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 15px;
    background: var(--board-bg);
    border-radius: 8px;
    min-width: 140px;
}

.sidebar-title {
    font-size: 0.9rem;
    color: white;
    margin: 0 0 5px 0;
    text-align: center;
}

.ai-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 20px 10px;
    color: white;
    font-size: 0.85rem;
}

.spinner {
    width: 28px;
    height: 28px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.ai-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.ai-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.ai-buttons .btn {
    padding: 10px 12px;
    font-size: 0.85rem;
    width: 100%;
}

.footer-buttons {
    display: flex;
    align-items: center;
    gap: 10px;
}

/* Board */
.board {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, 1fr);
    gap: 10px;
    padding: 10px;
    background: var(--board-bg);
    border-radius: 8px;
    width: min(calc(100vh - 250px), 400px);
    height: min(calc(100vh - 250px), 400px);
    max-width: 400px;
    max-height: 400px;
    overflow: hidden;
}

.cell {
    background: var(--cell-bg);
    border-radius: 6px;
    position: relative;
    overflow: visible !important;
    contain: none;
}

/* Tiles */
.tile {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    border-radius: 6px;
    transition: transform 0.15s ease-out;
}

.tile.empty {
    background: transparent;
}

.tile.tile-1 {
    background: var(--tile-1-bg);
    color: var(--tile-1-text);
}

.tile.tile-2 {
    background: var(--tile-2-bg);
    color: var(--tile-2-text);
}

.tile.tile-high {
    background: var(--tile-high-bg);
    color: var(--tile-high-text);
}

.tile.tile-high[data-value="3"] {
    color: var(--tile-3-text);
}

.tile.tile-4digit {
    font-size: 1.5rem;
}

.tile.tile-5digit {
    font-size: 1.2rem;
}

.tile.tile-6digit {
    font-size: 1rem;
}

/* Animations */
.tile.merge-pulse {
    animation: merge-pulse 0.2s ease-out;
}

@keyframes merge-pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.tile.spawn-fade {
    animation: spawn-fade 0.2s ease-out;
}

@keyframes spawn-fade {
    0% { opacity: 0; transform: scale(0.8); }
    100% { opacity: 1; transform: scale(1); }
}

/* Controls area */
.controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    max-width: 500px;
    padding: 15px 20px;
    margin-top: 10px;
}

.next-tile {
    display: flex;
    align-items: center;
    gap: 10px;
}

.next-tile-label {
    font-size: 0.9rem;
    color: var(--text-color);
}

.next-tile-box {
    width: 50px;
    height: 50px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: bold;
}

.next-tile-box.tile-1 {
    background: var(--tile-1-bg);
    color: var(--tile-1-text);
}

.next-tile-box.tile-2 {
    background: var(--tile-2-bg);
    color: var(--tile-2-text);
}

.next-tile-box.tile-high {
    background: var(--tile-high-bg);
    color: var(--tile-high-text);
}

.next-tile-box.tile-bonus {
    background: var(--tile-high-bg);
    color: #8B5CF6;
}

.bonus-options {
    display: flex;
    gap: 6px;
    align-items: center;
}

.ai-hint {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px;
    background: #2a2a4e;
    border-radius: 6px;
    color: #fff;
    min-width: 120px;
}

.ai-label {
    font-size: 0.75rem;
    color: #888;
}

#ai-action {
    font-weight: bold;
    color: #4CAF50;
    font-size: 0.85rem;
    text-align: center;
}

.ai-options {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 8px;
    background: rgba(0,0,0,0.2);
    border-radius: 6px;
    font-size: 0.8rem;
    color: white;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

.depth-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
}

.depth-label select {
    padding: 3px 6px;
    border-radius: 4px;
    border: 1px solid #ccc;
    background: white;
    font-size: 0.8rem;
}

.speed-control {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 8px;
    background: rgba(0,0,0,0.2);
    border-radius: 6px;
}

.speed-label {
    font-size: 0.8rem;
    color: white;
    text-align: center;
}

.speed-actual {
    color: #4CAF50;
    font-weight: bold;
}

.speed-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #cdc1b4;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.speed-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
}

.speed-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: #4CAF50;
    cursor: pointer;
    border: none;
}

.btn {
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: bold;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

.btn:active {
    transform: scale(0.98);
}

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

.btn-primary:hover {
    background: #e5533a;
}

.btn-secondary {
    background: var(--board-bg);
    color: white;
}

.btn-active {
    background: #4CAF50;
    color: white;
}

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

.btn-secondary:hover {
    background: #9f9183;
}

/* Sound toggle */
.sound-toggle {
    background: transparent;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 5px;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.sound-toggle:hover {
    opacity: 1;
}

/* Overlays */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 100;
}

.overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: white;
    padding: 30px;
    border-radius: 12px;
    text-align: center;
    max-width: 90%;
    width: 320px;
    transform: scale(0.9);
    transition: transform 0.3s;
}

.overlay.show .modal {
    transform: scale(1);
}

.modal h2 {
    margin-bottom: 20px;
    color: var(--text-color);
}

.modal p {
    margin-bottom: 10px;
    font-size: 1.1rem;
}

.modal .score-display {
    font-size: 2rem;
    font-weight: bold;
    color: var(--tile-high-text);
    margin: 15px 0;
}

.modal .new-high-score {
    color: #4CAF50;
    font-weight: bold;
    margin-bottom: 15px;
}

.modal .buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 20px;
}

/* Stats in game over */
.stats-row {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 15px 0;
}

.stat-item {
    text-align: center;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--tile-high-text);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-color);
}

/* Responsive adjustments */
@media (max-height: 600px) {
    .header {
        padding: 5px 20px;
        margin-bottom: 5px;
    }

    .title {
        font-size: 1.5rem;
    }

    .score-box {
        padding: 5px 12px;
    }

    .controls {
        padding: 10px 20px;
        margin-top: 5px;
    }

    .board {
        width: min(calc(100vh - 180px), 400px);
        height: min(calc(100vh - 180px), 400px);
    }
}

@media (max-width: 600px) {
    .game-wrapper {
        flex-direction: column;
        align-items: center;
    }

    .ai-sidebar {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
        min-width: auto;
        width: 100%;
        max-width: 400px;
    }

    .sidebar-title {
        width: 100%;
    }

    .ai-buttons {
        flex-direction: row;
    }

    .ai-buttons .btn {
        width: auto;
    }
}

@media (max-width: 360px) {
    .tile {
        font-size: 1.5rem;
    }

    .tile.tile-4digit {
        font-size: 1.2rem;
    }

    .tile.tile-5digit {
        font-size: 1rem;
    }

    .tile.tile-6digit {
        font-size: 0.8rem;
    }
}