/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Fredoka:wght@300;400;500;600;700&display=swap');

/* CSS変数（明るくポップなカラーパレット） */
:root {
    --primary-color: #FF6B6B;      /* 鮮やかなコーラルレッド */
    --secondary-color: #4ECDC4;    /* ターコイズブルー */
    --accent-color: #FFE66D;       /* サンシャインイエロー */
    --success-color: #95E1D3;      /* ミントグリーン */
    --warning-color: #FCE38A;      /* レモンイエロー */
    --danger-color: #F38BA8;       /* ソフトピンク */
    
    --text-dark: #2D3436;          /* ダークグレー */
    --text-light: #636E72;         /* ライトグレー */
    --white: #FFFFFF;
    --light-bg: #F8F9FF;           /* 薄い紫がかった白 */
    
    --board-bg: #4CAF50;          /* 明るい緑色で見やすく */
    --board-border: #2E7D32;      /* 適度な濃さのボーダー */
    --cell-hover: rgba(76, 175, 80, 0.15);
    
    /* シャドウ */
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 24px rgba(0, 0, 0, 0.2);
    
    /* アニメーション */
    --transition-fast: 0.2s ease;
    --transition-medium: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* リセット */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Fredoka', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-dark);
}

.game-container {
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-heavy);
    padding: 24px;
    max-width: 1200px;
    width: 100%;
    margin: 20px;
}

/* ヘッダー */
.game-header {
    text-align: center;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 3px solid var(--accent-color);
}

.game-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 12px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.current-player {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
}

.current-player-stone {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: #2D3436;
    border: 3px solid var(--white);
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
}

.current-player-stone.white {
    background: var(--white);
    border: 3px solid var(--text-dark);
}

/* メインゲームエリア */
.game-main {
    display: grid;
    grid-template-columns: 200px 1fr 200px;
    gap: 24px;
    align-items: start;
}

/* スコアボード */
.scoreboard {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.score-item {
    background: linear-gradient(135deg, var(--success-color), var(--secondary-color));
    padding: 16px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-medium);
}

.score-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.black-score {
    background: linear-gradient(135deg, var(--text-dark), #636E72);
}

.white-score {
    background: linear-gradient(135deg, var(--white), var(--light-bg));
    border: 2px solid var(--board-border);
}

.score-stone {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
}

.score-stone.black {
    background: var(--text-dark);
    border: 3px solid var(--white);
}

.score-stone.white {
    background: var(--white);
    border: 3px solid var(--text-dark);
}

.score-info {
    display: flex;
    flex-direction: column;
    color: var(--white);
}

.white-score .score-info {
    color: var(--text-dark);
}

.score-label {
    font-size: 0.9rem;
    font-weight: 500;
    opacity: 0.9;
}

.score-value {
    font-size: 1.8rem;
    font-weight: 700;
}

/* ゲーム盤 */
.board-container {
    display: flex;
    justify-content: center;
}

.board {
    display: grid;
    grid-template-columns: repeat(8, 60px);
    grid-template-rows: repeat(8, 60px);
    gap: 2px;
    background: var(--board-border);
    padding: 8px;
    border-radius: 16px;
    box-shadow: var(--shadow-medium);
    border: 3px solid var(--board-border);
}

.cell {
    background: var(--board-bg);
    border-radius: 4px;
    position: relative;
    cursor: pointer;
    transition: var(--transition-fast);
}

.cell:hover {
    background-color: var(--cell-hover);
}

.cell.valid-move {
    background-color: rgba(78, 205, 196, 0.2);
}

.cell.valid-move::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 15px;
    height: 15px;
    background: var(--secondary-color);
    border-radius: 50%;
    opacity: 0.6;
    animation: pulse 1.5s infinite;
}

/* ヒント表示 */
.cell.hint {
    background: linear-gradient(135deg, rgba(255, 230, 109, 0.3), rgba(78, 205, 196, 0.3));
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 15px rgba(255, 230, 109, 0.5);
    animation: hint-pulse 2s infinite;
}

.cell.hint::before {
    content: '💡';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 20px;
    z-index: 10;
    animation: hint-bounce 1s infinite;
}

.cell.hint::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    border-radius: 50%;
    opacity: 0.8;
    animation: hint-glow 2s infinite;
}

/* ヒントアニメーション */
@keyframes hint-pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 15px rgba(255, 230, 109, 0.5);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 25px rgba(255, 230, 109, 0.8);
    }
}

@keyframes hint-bounce {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.2);
    }
}

@keyframes hint-glow {
    0%, 100% {
        opacity: 0.8;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.4;
        transform: translate(-50%, -50%) scale(1.3);
    }
}

/* 最強の一手表示 */
.cell.best-move {
    background: linear-gradient(135deg, rgba(255, 107, 107, 0.4), rgba(255, 230, 109, 0.4));
    border: 3px solid var(--primary-color);
    box-shadow: 0 0 20px rgba(255, 107, 107, 0.7);
    animation: best-move-pulse 1.5s infinite;
}

.cell.best-move::before {
    content: '👑';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 24px;
    z-index: 10;
    animation: best-move-bounce 1s infinite;
}

.cell.best-move::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 25px;
    height: 25px;
    background: var(--primary-color);
    border-radius: 50%;
    opacity: 0.9;
    animation: best-move-glow 1.5s infinite;
}

/* 最強の一手アニメーション */
@keyframes best-move-pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 20px rgba(255, 107, 107, 0.7);
    }
    50% {
        transform: scale(1.08);
        box-shadow: 0 0 30px rgba(255, 107, 107, 1);
    }
}

@keyframes best-move-bounce {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.3);
    }
}

@keyframes best-move-glow {
    0%, 100% {
        opacity: 0.9;
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        opacity: 0.5;
        transform: translate(-50%, -50%) scale(1.4);
    }
}

.stone {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: 90%;
    height: 90%;
    border-radius: 50%;
    box-shadow: var(--shadow-light);
}

.stone.black {
    background: var(--text-dark);
    border: 4px solid var(--white);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.4);
}

.stone.white {
    background: var(--white);
    border: 4px solid var(--text-dark);
    box-shadow: 0 3px 12px rgba(0, 0, 0, 0.3);
}

.stone.flipping {
    animation: flip 0.6s ease-in-out;
}

.stone.placing {
    animation: place 0.4s ease-out;
}

/* ゲームコントロール */
.game-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.mode-controls, .game-actions {
    background: var(--light-bg);
    padding: 16px;
    border-radius: 16px;
    border: 1px solid var(--board-border);
    box-shadow: var(--shadow-light);
}

.mode-controls h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 12px;
    text-align: center;
    color: var(--primary-color);
}

.mode-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.ai-mode-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--board-border);
}

.ai-label {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-light);
    text-align: center;
}

.control-btn {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: none;
    background: linear-gradient(135deg, var(--white), var(--light-bg));
    border: 1px solid var(--board-border);
    color: var(--text-dark);
    font-family: 'Fredoka', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition-medium);
    box-shadow: var(--shadow-light);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.control-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
    border-color: var(--secondary-color);
}

.control-btn.active {
    background: var(--secondary-color);
    color: var(--white);
    font-weight: 600;
}

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

.game-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ゲーム状態表示 */
.game-status {
    grid-column: 1 / -1;
    text-align: center;
    margin-top: 16px;
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text-dark);
    background: var(--light-bg);
    padding: 12px;
    border-radius: 12px;
    box-shadow: var(--shadow-light);
}

.ai-thinking {
    animation: thinking-dots 1.5s infinite;
}

@keyframes thinking-dots {
    0%, 20% { content: "."; }
    40% { content: ".."; }
    60% { content: "..."; }
    80%, 100% { content: ""; }
}

/* モーダル */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(5px);
}

.modal-content {
    background: var(--white);
    border-radius: 20px;
    padding: 32px;
    max-width: 400px;
    width: 90%;
    text-align: center;
    box-shadow: var(--shadow-heavy);
    animation: modal-slide-in 0.3s ease;
}

.modal-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 24px;
}

.final-score {
    display: flex;
    justify-content: center;
    gap: 32px;
    margin: 24px 0;
}

.final-score-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.2rem;
    font-weight: 600;
}

.final-score-item .score-stone {
    width: 24px;
    height: 24px;
}

.final-score-item .score-label {
    color: var(--text-dark);
}

.final-score-item .score-value {
    color: var(--primary-color);
    font-size: 1.4rem;
}

.winner-text {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--success-color);
    margin: 16px 0;
}

.modal-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: var(--white);
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-medium);
    margin: 8px;
}

.modal-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

/* 設定モーダル */
.settings-section {
    margin: 20px 0;
    text-align: left;
}

.settings-section h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 12px;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 4px;
}

.setting-item {
    margin: 12px 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.setting-item label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    color: var(--text-dark);
    cursor: pointer;
}

.setting-item input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.setting-item input[type="range"] {
    flex: 1;
    height: 6px;
    border-radius: 3px;
    background: var(--board-border);
    outline: none;
    -webkit-appearance: none;
}

.setting-item input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    box-shadow: var(--shadow-light);
}

.setting-item select {
    padding: 8px 12px;
    border: 2px solid var(--board-border);
    border-radius: 8px;
    background: var(--white);
    color: var(--text-dark);
    font-size: 1rem;
    outline: none;
    transition: var(--transition-medium);
}

.setting-item select:focus {
    border-color: var(--primary-color);
}

.settings-actions {
    display: flex;
    justify-content: center;
    gap: 16px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 2px solid var(--accent-color);
}

/* アニメーション */
@keyframes flip {
    0% { transform: translate(-50%, -50%) rotateY(0deg) scale(1); }
    50% { transform: translate(-50%, -50%) rotateY(90deg) scale(0.8); }
    100% { transform: translate(-50%, -50%) rotateY(180deg) scale(1); }
}

@keyframes place {
    0% { transform: translate(-50%, -50%) scale(0); opacity: 0; }
    70% { transform: translate(-50%, -50%) scale(1.1); opacity: 1; }
    100% { transform: translate(-50%, -50%) scale(0.9); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.6; }
    50% { transform: scale(1.2); opacity: 0.8; }
}

@keyframes modal-slide-in {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* レスポンシブ */
@media (max-width: 1024px) {
    .game-main {
        grid-template-columns: 1fr;
        grid-template-areas:
            "scoreboard"
            "board"
            "controls"
            "status";
    }
    .scoreboard, .game-controls {
        flex-direction: row;
        justify-content: space-around;
        width: 100%;
        max-width: 500px;
        margin: 0 auto;
    }
    .board-container {
        justify-self: center;
    }
}

@media (max-width: 768px) {
    .board {
        grid-template-columns: repeat(8, 50px);
        grid-template-rows: repeat(8, 50px);
    }
}

@media (max-width: 480px) {
    .game-container {
        padding: 16px;
    }
    .game-main {
        gap: 16px;
    }
    .board {
        grid-template-columns: repeat(8, 10vw);
        grid-template-rows: repeat(8, 10vw);
        max-width: 90vw;
    }
    .scoreboard, .game-controls {
        flex-direction: column;
    }
    .game-title {
        font-size: 2rem;
    }
}