/* リセットと基本スタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
    color: #fff;
    user-select: none;
}

/* ゲームコンテナ */
.game-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ヘッダー */
.game-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 15px;
    margin-bottom: 20px;
    padding: 15px 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    position: relative;
    z-index: 100;
}

.game-header h1 {
    font-size: 1.8rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.game-controls {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

/* ホームリンク */
.home-link {
    color: #fff;
    text-decoration: none;
    font-size: 0.9rem;
    padding: 8px 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.home-link:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ボタン */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.2);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: linear-gradient(135deg, #4a90d9 0%, #357abd 100%);
    color: white;
}

.btn-secondary {
    background: linear-gradient(135deg, #6c757d 0%, #545b62 100%);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, #28a745 0%, #1e7e34 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
    color: white;
}

.btn-large {
    padding: 15px 40px;
    font-size: 1.2rem;
}

.btn-small {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

/* モード選択ドロップダウン */
.mode-dropdown {
    position: relative;
    display: inline-block;
}

.mode-dropdown-content {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 200px;
    background: rgba(30, 30, 50, 0.98);
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
    z-index: 1000;
    margin-top: 8px;
    padding: 8px 0;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.mode-dropdown-content.show {
    display: block;
}

.dropdown-section {
    padding: 8px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.dropdown-section:last-child {
    border-bottom: none;
}

.dropdown-title {
    padding: 8px 16px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 600;
}

.dropdown-item {
    display: block;
    width: 100%;
    padding: 10px 16px;
    background: none;
    border: none;
    color: #fff;
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s ease;
}

.dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.dropdown-item.active {
    background: rgba(74, 144, 217, 0.3);
    color: #4a90d9;
}

/* ゲーム情報パネル */
.game-info-panel {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 20px;
    padding: 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}

.player-info {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 15px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    transition: all 0.3s ease;
}

.player-info.active {
    background: rgba(255, 215, 0, 0.15);
    box-shadow: 0 0 15px rgba(255, 215, 0, 0.3);
}

.player-disc {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.player-disc.black {
    background: radial-gradient(circle at 30% 30%, #555, #1a1a1a);
}

.player-disc.white {
    background: radial-gradient(circle at 30% 30%, #fff, #ccc);
}

.player-details {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.player-name {
    font-size: 0.9rem;
    opacity: 0.9;
}

.disc-count {
    font-size: 1.8rem;
    font-weight: bold;
    color: #ffd700;
}

.turn-indicator {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: transparent;
    transition: all 0.3s ease;
}

.player-info.active .turn-indicator {
    background: #ffd700;
    box-shadow: 0 0 10px #ffd700;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
}

.game-status {
    text-align: center;
    flex: 1;
}

.current-turn {
    font-size: 1.3rem;
    font-weight: bold;
    margin-bottom: 5px;
}

.game-mode {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ゲームボードラッパー */
.game-board-wrapper {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 10px 0;
}

.board-container {
    position: relative;
    padding: 15px;
    background: linear-gradient(145deg, #2d5016 0%, #1a3d0a 100%);
    border-radius: 12px;
    box-shadow: 
        0 10px 40px rgba(0, 0, 0, 0.5),
        inset 0 2px 4px rgba(255, 255, 255, 0.1);
}

/* ボード */
.board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 2px;
    background: #1a1a1a;
    padding: 2px;
    border-radius: 4px;
}

/* セル */
.cell {
    width: 60px;
    height: 60px;
    background: linear-gradient(145deg, #2d8a4e 0%, #1e6b3a 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: all 0.2s ease;
}

.cell:hover {
    background: linear-gradient(145deg, #3aa05e 0%, #2a8548 100%);
}

.cell.valid-move {
    cursor: pointer;
}

.cell.valid-move::after {
    content: '';
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(255, 215, 0, 0.4);
    animation: validPulse 1.5s infinite;
}

@keyframes validPulse {
    0%, 100% { transform: scale(1); opacity: 0.4; }
    50% { transform: scale(1.1); opacity: 0.6; }
}

.cell.hint-cell::after {
    content: '';
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(0, 255, 128, 0.6);
    animation: hintPulse 0.8s infinite;
    box-shadow: 0 0 15px rgba(0, 255, 128, 0.8);
}

@keyframes hintPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.15); }
}

.cell.last-move {
    box-shadow: inset 0 0 0 3px rgba(255, 215, 0, 0.6);
}

/* 石（ディスク） */
.disc {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    position: absolute;
    transition: all 0.3s ease;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
}

.disc.black {
    background: radial-gradient(circle at 30% 30%, #555, #1a1a1a);
}

.disc.white {
    background: radial-gradient(circle at 30% 30%, #fff, #ccc);
}

/* 石を置くアニメーション */
.disc.placing {
    animation: placeDisc 0.3s ease-out;
}

@keyframes placeDisc {
    0% { transform: scale(0) rotateX(90deg); opacity: 0; }
    50% { transform: scale(1.1) rotateX(0deg); opacity: 1; }
    100% { transform: scale(1) rotateX(0deg); opacity: 1; }
}

/* 石をひっくり返すアニメーション */
.disc.flipping {
    animation: flipDisc 0.5s ease-in-out;
}

@keyframes flipDisc {
    0% { transform: rotateY(0deg); }
    50% { transform: rotateY(90deg); }
    100% { transform: rotateY(180deg); }
}

/* モーダル */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    backdrop-filter: blur(5px);
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: linear-gradient(145deg, #2a2a4a 0%, #1a1a2e 100%);
    padding: 40px 50px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: modal-appear 0.3s ease;
    max-width: 90vw;
    max-height: 90vh;
    overflow-y: auto;
}

@keyframes modal-appear {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.modal-content h2 {
    font-size: 2rem;
    margin-bottom: 25px;
}

.modal-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 25px;
    flex-wrap: wrap;
}

/* モード選択 */
.mode-options {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.mode-section h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    opacity: 0.8;
}

.difficulty-options {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.mode-section:last-child {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.mode-section:last-child .mode-btn {
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    gap: 15px;
    padding: 20px;
    min-width: auto;
    flex: 1;
}

.mode-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 20px 25px;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: 15px;
    color: #fff;
    cursor: pointer;
    transition: all 0.3s ease;
    min-width: 120px;
}

.mode-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: #ffd700;
    transform: translateY(-5px);
}

.mode-btn.wide {
    min-width: 250px;
}

.pvp-options {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.mode-icon {
    font-size: 2rem;
}

.mode-name {
    font-size: 1.1rem;
    font-weight: bold;
}

.mode-desc {
    font-size: 0.8rem;
    opacity: 0.7;
}

/* 結果モーダル */
.result-content {
    min-width: 350px;
}

#result-title {
    font-size: 2.5rem;
}

#result-title.win {
    color: #ffd700;
}

#result-title.lose {
    color: #ff6b6b;
}

#result-title.draw {
    color: #4ecdc4;
}

.result-score {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin: 30px 0;
}

.score-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.score-disc {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
}

.score-disc.black {
    background: radial-gradient(circle at 30% 30%, #555, #1a1a1a);
}

.score-disc.white {
    background: radial-gradient(circle at 30% 30%, #fff, #ccc);
}

.score-value {
    font-size: 3rem;
    font-weight: bold;
}

.score-separator {
    font-size: 2.5rem;
    opacity: 0.5;
}

.result-message {
    font-size: 1.1rem;
    opacity: 0.8;
    margin-bottom: 10px;
}

/* パスモーダル */
.pass-content {
    min-width: 300px;
}

.pass-content h2 {
    color: #ffa500;
}

.pass-content p {
    margin: 20px 0;
    font-size: 1.1rem;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .game-container {
        padding: 10px;
    }
    
    .game-header {
        flex-direction: column;
        text-align: center;
        padding: 12px;
    }
    
    .game-header h1 {
        font-size: 1.5rem;
    }
    
    .game-info-panel {
        flex-direction: column;
        gap: 15px;
        padding: 15px;
    }
    
    .player-info {
        width: 100%;
        justify-content: center;
    }
    
    .black-player {
        order: 1;
    }
    
    .game-status {
        order: 2;
    }
    
    .white-player {
        order: 3;
    }
    
    .cell {
        width: 42px;
        height: 42px;
    }
    
    .disc {
        width: 34px;
        height: 34px;
    }
    
    .cell.valid-move::after,
    .cell.hint-cell::after {
        width: 14px;
        height: 14px;
    }
    
    .board-container {
        padding: 10px;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 0.9rem;
    }
    
    .modal-content {
        padding: 25px 20px;
    }
    
    .difficulty-options {
        flex-direction: column;
    }
    
    .mode-btn {
        width: 100%;
    }
}

@media (max-width: 400px) {
    .cell {
        width: 36px;
        height: 36px;
    }
    
    .disc {
        width: 28px;
        height: 28px;
    }
    
    .cell.valid-move::after,
    .cell.hint-cell::after {
        width: 12px;
        height: 12px;
    }
}

/* 思考中インジケーター */
.thinking-indicator {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 100;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    padding: 30px 40px;
    background: rgba(0, 0, 0, 0.8);
    border-radius: 15px;
    backdrop-filter: blur(10px);
}

.thinking-indicator.hidden {
    display: none;
}

.thinking-spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.thinking-text {
    font-size: 1rem;
    opacity: 0.9;
}

/* 背景エフェクト */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(45, 138, 78, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(78, 205, 196, 0.1) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}

/* ========================================
   オンライン対戦関連のスタイル
======================================== */

/* オンラインロビーモーダル */
.online-content {
    max-width: 450px;
}

.online-description {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 25px;
    line-height: 1.6;
    color: #ccc;
}

.online-screen {
    text-align: center;
    padding: 20px 0;
}

.online-screen.hidden {
    display: none;
}

/* 名前入力 */
.name-input-section {
    margin: 20px 0;
}

.name-input-section label {
    display: block;
    margin-bottom: 8px;
    font-size: 1rem;
}

.name-input-section input {
    width: 100%;
    max-width: 250px;
    padding: 12px 15px;
    font-size: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    text-align: center;
}

.name-input-section input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.name-input-section input:focus {
    outline: none;
    border-color: #ffd700;
    background: rgba(255, 255, 255, 0.15);
}

/* マッチング中アニメーション */
.matching-animation {
    padding: 30px 0;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.2);
    border-top-color: #e74c3c;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

.waiting-info {
    font-size: 0.9rem;
    color: #888;
    margin-top: 10px;
}

/* オンライン対戦中ステータスバー */
.online-status {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, #2c3e50 0%, #1a252f 100%);
    padding: 10px 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.online-status.hidden {
    display: none;
}

.online-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.online-player {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 15px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.1);
}

.online-player.me {
    border: 2px solid #3498db;
}

.online-player.opponent {
    border: 2px solid #e74c3c;
}

.online-player-name {
    font-weight: bold;
    font-size: 0.95rem;
}

.online-player-disc {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.online-player-disc.black {
    background: radial-gradient(circle at 30% 30%, #555, #1a1a1a);
}

.online-player-disc.white {
    background: radial-gradient(circle at 30% 30%, #fff, #ccc);
}

.vs-label {
    font-size: 1.2rem;
    font-weight: bold;
    color: #ffd700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
}

/* オンライン対戦中のヘッダー位置調整 */
body.online-active .game-container {
    padding-top: 70px;
}

/* 相手の番の時のオーバーレイ */
.opponent-turn-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
    z-index: 50;
}

.opponent-turn-overlay.hidden {
    display: none;
}

.opponent-turn-text {
    background: rgba(0, 0, 0, 0.8);
    padding: 15px 30px;
    border-radius: 10px;
    font-size: 1.1rem;
    color: #ffd700;
}

/* オンライン結果モーダル */
#online-result-title.win {
    color: #ffd700;
}

#online-result-title.lose {
    color: #ff6b6b;
}

#online-result-title.draw {
    color: #4ecdc4;
}

#online-result-title.disconnect {
    color: #ffa500;
}

/* レスポンシブ対応（オンライン） */
@media (max-width: 768px) {
    .online-status {
        flex-direction: column;
        gap: 10px;
        padding: 8px 10px;
    }
    
    .online-info {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .online-player {
        padding: 6px 10px;
        font-size: 0.85rem;
    }
    
    body.online-active .game-container {
        padding-top: 100px;
    }
}