/* ==================== 基础样式 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    /* 防止iOS双击缩放 */
    touch-action: manipulation;
}

body {
    font-family: 'Microsoft YaHei', 'PingFang SC', -apple-system, sans-serif;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    /* 防止iOS过度滚动 */
    overscroll-behavior: none;
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* ==================== 开始界面 ==================== */
.start-screen {
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.start-screen h1 {
    font-size: 72px;
    color: #fff;
    text-shadow: 0 0 30px rgba(102, 126, 234, 0.8);
    margin-bottom: 20px;
    letter-spacing: 10px;
}

.start-screen .subtitle {
    color: #888;
    font-size: 18px;
    margin-bottom: 40px;
    letter-spacing: 5px;
}

.menu-container {
    background: linear-gradient(145deg, #2a2a4a, #1a1a3a);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.5);
    min-width: 420px;
    max-width: 500px;
}

.menu-title {
    color: #e0e0e0;
    font-size: 20px;
    margin-bottom: 25px;
}

/* 主菜单按钮 */
.menu-btn {
    display: block;
    width: 100%;
    padding: 18px 30px;
    margin-bottom: 15px;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.3s;
}

.menu-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.menu-btn.pvp {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.menu-btn.pve {
    background: linear-gradient(135deg, #11998e, #38ef7d);
    color: white;
}

.menu-btn .desc {
    display: block;
    font-size: 12px;
    opacity: 0.8;
    margin-top: 5px;
}

/* 子菜单 */
.sub-menu {
    display: none;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid #3a3a5a;
}

.sub-menu.show {
    display: block;
    animation: fadeIn 0.3s ease;
}

.sub-menu h3 {
    color: #aaa;
    font-size: 14px;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* ==================== 难度选择卡片 ==================== */
.diff-card {
    background: rgba(255,255,255,0.03);
    border: 2px solid transparent;
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.3s;
    text-align: left;
}

.diff-card:hover {
    transform: translateX(5px);
    background: rgba(255,255,255,0.06);
}

.diff-card.easy {
    border-color: rgba(76, 175, 80, 0.3);
}
.diff-card.easy:hover {
    border-color: #4caf50;
    box-shadow: 0 0 20px rgba(76, 175, 80, 0.2);
}

.diff-card.medium {
    border-color: rgba(255, 152, 0, 0.3);
}
.diff-card.medium:hover {
    border-color: #ff9800;
    box-shadow: 0 0 20px rgba(255, 152, 0, 0.2);
}

.diff-card.hard {
    border-color: rgba(244, 67, 54, 0.3);
}
.diff-card.hard:hover {
    border-color: #f44336;
    box-shadow: 0 0 20px rgba(244, 67, 54, 0.2);
}

.diff-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.diff-title {
    font-size: 18px;
    font-weight: bold;
    color: #fff;
}

.diff-badge {
    font-size: 10px;
    padding: 3px 8px;
    border-radius: 10px;
    text-transform: uppercase;
}

.diff-card.easy .diff-badge {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
}
.diff-card.medium .diff-badge {
    background: rgba(255, 152, 0, 0.2);
    color: #ff9800;
}
.diff-card.hard .diff-badge {
    background: rgba(244, 67, 54, 0.2);
    color: #f44336;
}

.diff-card .diff-desc {
    color: #999;
    font-size: 13px;
    margin-bottom: 12px;
}

/* 算法信息 */
.algorithm-info {
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    padding: 12px;
    margin-top: 10px;
}

.algo-title {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #ccc;
    font-size: 12px;
    font-weight: bold;
    margin-bottom: 8px;
}

.algo-icon {
    font-size: 14px;
}

.algo-desc {
    color: #888;
    font-size: 11px;
    line-height: 1.6;
    margin-bottom: 10px;
}

.algo-desc strong {
    color: #aaa;
}

.algo-complexity {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: #666;
}

.algo-complexity code {
    background: rgba(102, 126, 234, 0.2);
    color: #667eea;
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Consolas', monospace;
}

.complexity-note {
    color: #555;
    font-size: 10px;
}

/* 选择棋子颜色 */
.color-selection {
    display: flex;
    gap: 15px;
    margin-top: 15px;
}

.color-btn {
    flex: 1;
    padding: 20px;
    border: 3px solid #3a3a5a;
    border-radius: 15px;
    background: rgba(255,255,255,0.05);
    cursor: pointer;
    transition: all 0.3s;
    text-align: center;
}

.color-btn:hover {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    transform: translateY(-3px);
}

.color-btn .piece-preview {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    margin: 0 auto 10px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.4);
}

.color-btn .piece-preview.black {
    background: radial-gradient(circle at 35% 35%, #555, #111);
}

.color-btn .piece-preview.white {
    background: radial-gradient(circle at 35% 35%, #fff, #ccc);
}

.color-btn .color-label {
    color: #ccc;
    font-size: 16px;
    font-weight: bold;
}

.color-btn .color-hint {
    color: #888;
    font-size: 12px;
    margin-top: 5px;
}

/* 返回按钮 */
.back-btn {
    margin-top: 20px;
    padding: 12px 24px;
    background: transparent;
    border: 1px solid #555;
    border-radius: 8px;
    color: #888;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.back-btn:hover {
    border-color: #888;
    color: #fff;
}

/* ==================== 算法总览 ==================== */
.algorithm-overview {
    margin-top: 40px;
    padding: 25px;
    background: rgba(255,255,255,0.03);
    border-radius: 15px;
    max-width: 500px;
}

.algorithm-overview h4 {
    color: #ccc;
    font-size: 14px;
    margin-bottom: 15px;
}

.algo-cards {
    display: flex;
    gap: 10px;
}

.algo-card {
    flex: 1;
    padding: 12px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    text-align: center;
}

.algo-card h5 {
    color: #667eea;
    font-size: 12px;
    margin-bottom: 5px;
}

.algo-card p {
    color: #888;
    font-size: 10px;
    line-height: 1.4;
}

/* ==================== 游戏界面 ==================== */
.game-wrapper {
    display: none;
    gap: 25px;
    align-items: flex-start;
}

.game-wrapper.show {
    display: flex;
    animation: fadeIn 0.5s ease;
}

.game-container {
    background: linear-gradient(145deg, #2a2a4a, #1a1a3a);
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.1);
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.game-header h1 {
    color: #e0e0e0;
    font-size: 28px;
}

.exit-btn {
    padding: 8px 16px;
    background: rgba(255,255,255,0.1);
    border: 1px solid #4a4a6a;
    border-radius: 8px;
    color: #aaa;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.exit-btn:hover {
    background: rgba(244, 67, 54, 0.2);
    border-color: #f44336;
    color: #f44336;
}

.mode-info {
    text-align: center;
    padding: 10px 20px;
    background: rgba(102, 126, 234, 0.15);
    border-radius: 10px;
    margin-bottom: 15px;
    color: #667eea;
    font-size: 14px;
}

/* 状态栏 */
.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 20px;
    background: rgba(255,255,255,0.05);
    border-radius: 12px;
    margin-bottom: 15px;
}

.player-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.player-piece {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.player-piece.black {
    background: radial-gradient(circle at 35% 35%, #555, #111);
}

.player-piece.white {
    background: radial-gradient(circle at 35% 35%, #fff, #ccc);
}

.player-label {
    color: #888;
    font-size: 14px;
}

.player-label.active {
    color: #fff;
    font-weight: bold;
}

.player-label .you-tag {
    font-size: 10px;
    background: #667eea;
    color: white;
    padding: 2px 6px;
    border-radius: 4px;
    margin-left: 5px;
}

.turn-indicator {
    color: #667eea;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.turn-indicator .arrow {
    animation: pulse 1s infinite;
}

/* 棋盘 */
.board-container {
    position: relative;
    margin: 0 auto;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 30px rgba(0,0,0,0.4);
}

#board {
    display: block;
    cursor: pointer;
    /* 移动端优化 */
    touch-action: none;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
}

#board.disabled {
    cursor: not-allowed;
}

/* 按钮 */
.buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 20px;
}

button.action-btn {
    padding: 12px 28px;
    font-size: 15px;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    font-weight: 500;
    /* 移动端优化 */
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

button.action-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.3);
}

#undoBtn {
    background: linear-gradient(135deg, #ff9800, #f57c00);
    color: white;
}

#undoBtn:disabled {
    background: #444;
    color: #666;
    cursor: not-allowed;
    transform: none;
}

#restartBtn {
    background: linear-gradient(135deg, #4caf50, #388e3c);
    color: white;
}

/* 游戏结果 */
.game-result {
    margin-top: 20px;
    padding: 20px;
    border-radius: 12px;
    text-align: center;
    display: none;
}

.game-result.show {
    display: block;
    animation: slideUp 0.5s ease;
}

.game-result.black-wins {
    background: linear-gradient(135deg, #2a2a2a, #1a1a1a);
    border: 2px solid #444;
}

.game-result.white-wins {
    background: linear-gradient(135deg, #f5f5f5, #e0e0e0);
    border: 2px solid #ccc;
}

.game-result.draw {
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.game-result h2 {
    font-size: 24px;
    margin-bottom: 8px;
}

.game-result.black-wins h2 { color: #fff; }
.game-result.white-wins h2 { color: #333; }
.game-result.draw h2 { color: #fff; }

.game-result p {
    font-size: 14px;
    opacity: 0.8;
}

.game-result.black-wins p { color: #aaa; }
.game-result.white-wins p { color: #666; }
.game-result.draw p { color: rgba(255,255,255,0.8); }

.game-result-buttons {
    margin-top: 15px;
    display: flex;
    justify-content: center;
    gap: 10px;
}

.game-result-buttons button {
    padding: 10px 20px;
    border: none;
    border-radius: 8px;
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}

.game-result-buttons .play-again {
    background: #667eea;
    color: white;
}

.game-result-buttons .back-menu {
    background: rgba(255,255,255,0.2);
    color: inherit;
}

/* ==================== 侧边栏 ==================== */
.side-panel {
    background: linear-gradient(145deg, #2a2a4a, #1a1a3a);
    border-radius: 20px;
    padding: 25px;
    width: 240px;
    box-shadow: 0 15px 50px rgba(0,0,0,0.5);
}

.side-panel h3 {
    color: #e0e0e0;
    font-size: 18px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #3a3a5a;
}

.move-history {
    max-height: 280px;
    overflow-y: auto;
    font-size: 13px;
}

.move-history::-webkit-scrollbar {
    width: 6px;
}

.move-history::-webkit-scrollbar-track {
    background: #1a1a3a;
    border-radius: 3px;
}

.move-history::-webkit-scrollbar-thumb {
    background: #4a4a6a;
    border-radius: 3px;
}

.move-item {
    display: flex;
    align-items: center;
    padding: 6px 10px;
    margin-bottom: 4px;
    background: rgba(255,255,255,0.03);
    border-radius: 6px;
}

.move-item .num {
    width: 24px;
    color: #666;
    font-size: 11px;
}

.move-item .piece-icon {
    width: 14px;
    height: 14px;
    border-radius: 50%;
    margin-right: 8px;
}

.move-item .piece-icon.black {
    background: radial-gradient(circle at 35% 35%, #555, #111);
}

.move-item .piece-icon.white {
    background: radial-gradient(circle at 35% 35%, #fff, #bbb);
    border: 1px solid #666;
}

.move-item .pos {
    color: #ccc;
}

.stats {
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px solid #3a3a5a;
}

.stat-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    color: #888;
    font-size: 13px;
}

.stat-item .value {
    color: #fff;
}

/* AI信息 */
.ai-info {
    margin-top: 20px;
    padding: 15px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.ai-info h4 {
    color: #888;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.ai-algo-name {
    color: #667eea;
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 8px;
}

.ai-algo-desc {
    color: #888;
    font-size: 11px;
    line-height: 1.5;
}

/* 思考动画 */
.thinking {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px;
    margin-top: 15px;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 10px;
    color: #667eea;
    font-size: 14px;
}

.thinking.show {
    display: flex;
}

.thinking-dots {
    display: flex;
    gap: 4px;
}

.thinking-dots span {
    width: 8px;
    height: 8px;
    background: #667eea;
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.thinking-dots span:nth-child(1) { animation-delay: -0.32s; }
.thinking-dots span:nth-child(2) { animation-delay: -0.16s; }

/* ==================== 算法说明书按钮 ==================== */
.menu-btn.docs {
    background: linear-gradient(135deg, #6c5ce7, #a29bfe);
    color: white;
}

/* ==================== 算法说明书弹窗 ==================== */
.docs-overlay {
    display: none !important;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 1000;
    overflow-y: auto;
    padding: 40px 20px;
}

.docs-overlay.show {
    display: block !important;
    animation: fadeIn 0.3s ease;
}

.docs-container {
    max-width: 900px;
    margin: 0 auto;
    background: linear-gradient(145deg, #1e1e3f, #151530);
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

.docs-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 25px 30px;
    background: linear-gradient(135deg, #667eea, #764ba2);
}

.docs-header h2 {
    color: white;
    font-size: 24px;
    margin: 0;
}

.docs-close {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.3s;
}

.docs-close:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.docs-content {
    padding: 30px;
}

/* 目录 */
.docs-toc {
    background: rgba(102, 126, 234, 0.1);
    border-radius: 12px;
    padding: 20px 25px;
    margin-bottom: 30px;
}

.docs-toc h3 {
    color: #667eea;
    font-size: 16px;
    margin-bottom: 15px;
}

.docs-toc ul {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.docs-toc li a {
    display: inline-block;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    color: #aaa;
    text-decoration: none;
    font-size: 13px;
    transition: all 0.3s;
}

.docs-toc li a:hover {
    background: #667eea;
    color: white;
}

/* 章节 */
.docs-section {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid #2a2a4a;
}

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

.docs-section h3 {
    color: #e0e0e0;
    font-size: 22px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

/* 难度标签 */
.difficulty-tag {
    display: inline-block;
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 12px;
    margin-bottom: 20px;
}

.difficulty-tag.easy {
    background: rgba(76, 175, 80, 0.2);
    color: #4caf50;
}

.difficulty-tag.hard {
    background: rgba(244, 67, 54, 0.2);
    color: #f44336;
}

/* 卡片 */
.docs-card {
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
}

.docs-card.history {
    border-left: 4px solid #667eea;
}

.docs-card.example {
    border-left: 4px solid #4caf50;
}

.docs-card h4 {
    color: #ccc;
    font-size: 16px;
    margin-bottom: 12px;
}

.docs-card p {
    color: #999;
    font-size: 14px;
    line-height: 1.8;
}

.docs-card ul {
    color: #999;
    font-size: 14px;
    line-height: 2;
    padding-left: 20px;
}

.docs-card strong {
    color: #e0e0e0;
}

/* 公式框 */
.formula-box {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 15px 0;
    text-align: center;
}

.formula-box.large {
    padding: 25px;
}

.formula {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 18px;
    color: #667eea;
    margin-bottom: 10px;
}

.formula sup {
    font-size: 12px;
}

.formula-cases {
    display: block;
    text-align: left;
    padding-left: 30px;
    font-size: 14px;
    line-height: 1.8;
}

.formula-desc {
    color: #888;
    font-size: 12px;
    margin-top: 10px;
}

/* 趣味知识 */
.fun-fact {
    display: flex;
    gap: 15px;
    background: linear-gradient(135deg, rgba(255, 193, 7, 0.1), rgba(255, 152, 0, 0.1));
    border-radius: 10px;
    padding: 15px;
    margin-top: 15px;
}

.fact-icon {
    font-size: 24px;
}

.fun-fact p {
    color: #ccc;
    font-size: 13px;
    line-height: 1.6;
}

/* 分数表格 */
.score-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
}

.score-table th,
.score-table td {
    padding: 12px;
    text-align: center;
    border-bottom: 1px solid #2a2a4a;
}

.score-table th {
    color: #888;
    font-size: 12px;
    text-transform: uppercase;
}

.score-table td {
    color: #ccc;
    font-size: 14px;
}

.score-table .score {
    color: #667eea;
    font-family: 'Consolas', monospace;
    font-weight: bold;
}

.table-note {
    color: #666;
    font-size: 12px;
    margin-top: 10px;
    text-align: center;
}

/* 博弈树 */
.game-tree {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 10px;
    padding: 20px;
    overflow-x: auto;
}

.game-tree pre {
    font-family: 'Consolas', monospace;
    font-size: 13px;
    color: #aaa;
    line-height: 1.4;
    white-space: pre;
}

/* 示例棋盘 */
.example-board {
    background: #e8c170;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
}

.example-board pre {
    font-family: 'Consolas', monospace;
    font-size: 14px;
    color: #5d4e37;
    line-height: 1.4;
}

/* 方向演示 */
.direction-demo {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 20px 0;
}

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

.dir-arrow {
    display: block;
    font-size: 36px;
    color: #667eea;
    margin-bottom: 5px;
}

.dir-item span:last-child {
    color: #888;
    font-size: 12px;
}

/* 代码块 */
.code-block {
    background: #1a1a2e;
    border-radius: 10px;
    padding: 20px;
    overflow-x: auto;
}

.code-block pre {
    font-family: 'Consolas', 'Monaco', monospace;
    font-size: 13px;
    color: #a8e6cf;
    line-height: 1.6;
}

/* 页脚 */
.docs-footer {
    text-align: center;
    padding: 30px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    border-radius: 12px;
    margin-top: 20px;
}

.docs-footer p {
    color: #888;
    font-size: 16px;
}

/* ==================== AI压迫感面板 ==================== */
.board-area {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.ai-pressure-panel {
    display: none !important;
    width: 200px;
    background: linear-gradient(145deg, #1a1a2e, #0f0f1e);
    border-radius: 12px;
    padding: 15px;
    border: 1px solid rgba(102, 126, 234, 0.3);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.1);
}

.ai-pressure-panel.show {
    display: block !important;
    animation: fadeIn 0.3s ease;
}

.pressure-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid #2a2a4a;
}

.pressure-icon {
    font-size: 20px;
}

.pressure-title {
    color: #667eea;
    font-size: 14px;
    font-weight: bold;
}

.pressure-formula {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 15px;
    font-family: 'Consolas', monospace;
    font-size: 11px;
    color: #a8e6cf;
    line-height: 1.6;
    min-height: 60px;
}

.pressure-stats {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.pressure-stats .stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.pressure-stats .stat-label {
    color: #888;
    font-size: 12px;
}

.pressure-stats .stat-value {
    color: #667eea;
    font-size: 14px;
    font-family: 'Consolas', monospace;
    font-weight: bold;
}

.pressure-tip {
    margin-top: 15px;
    padding-top: 10px;
    border-top: 1px solid #2a2a4a;
    color: #666;
    font-size: 11px;
    line-height: 1.5;
}

/* 思考中动画增强 */
.ai-pressure-panel.thinking .pressure-title {
    animation: pulse 1s infinite;
}

.ai-pressure-panel.thinking .pressure-formula {
    border: 1px solid rgba(102, 126, 234, 0.5);
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.2);
}

/* ==================== 响应式 ==================== */

/* 平板设备 */
@media (max-width: 900px) {
    .game-wrapper {
        flex-direction: column;
        align-items: center;
    }

    .side-panel {
        width: 100%;
        max-width: 500px;
    }

    .menu-container {
        min-width: 320px;
        max-width: 100%;
        padding: 25px;
    }

    .start-screen h1 {
        font-size: 48px;
    }

    .algo-cards {
        flex-direction: column;
    }

    .board-area {
        flex-direction: column;
        align-items: center;
    }

    .ai-pressure-panel {
        width: 100%;
        max-width: 400px;
        order: -1;
        margin-bottom: 15px;
    }

    .ai-pressure-panel.show {
        display: flex !important;
        flex-wrap: wrap;
        gap: 15px;
    }

    .pressure-header {
        width: 100%;
        margin-bottom: 10px;
        padding-bottom: 10px;
    }

    .pressure-formula {
        flex: 1;
        min-width: 150px;
        margin-bottom: 0;
    }

    .pressure-stats {
        flex: 1;
        min-width: 120px;
    }

    .pressure-tip {
        width: 100%;
        margin-top: 10px;
        padding-top: 10px;
    }
}

/* 手机设备 */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }

    /* 开始界面 */
    .start-screen h1 {
        font-size: 36px;
        letter-spacing: 5px;
    }

    .start-screen .subtitle {
        font-size: 14px;
        margin-bottom: 25px;
    }

    .menu-container {
        min-width: auto;
        width: 100%;
        padding: 20px 15px;
        border-radius: 15px;
    }

    .menu-title {
        font-size: 16px;
        margin-bottom: 18px;
    }

    .menu-btn {
        padding: 14px 20px;
        font-size: 16px;
        margin-bottom: 12px;
    }

    .menu-btn .desc {
        font-size: 11px;
    }

    /* 难度选择 */
    .diff-card {
        padding: 12px;
        margin-bottom: 10px;
    }

    .diff-title {
        font-size: 16px;
    }

    .diff-card .diff-desc {
        font-size: 12px;
        margin-bottom: 8px;
    }

    /* 颜色选择 */
    .color-selection {
        gap: 10px;
    }

    .color-btn {
        padding: 15px 10px;
    }

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

    .color-btn .color-label {
        font-size: 14px;
    }

    /* 游戏界面 */
    .game-container {
        padding: 15px;
        border-radius: 15px;
        width: 100%;
    }

    .game-header {
        margin-bottom: 12px;
    }

    .game-header h1 {
        font-size: 20px;
    }

    .exit-btn {
        padding: 6px 12px;
        font-size: 12px;
    }

    .mode-info {
        padding: 8px 12px;
        font-size: 12px;
        margin-bottom: 10px;
    }

    /* 状态栏 */
    .status-bar {
        padding: 10px 12px;
        margin-bottom: 10px;
        border-radius: 10px;
    }

    .player-piece {
        width: 22px;
        height: 22px;
    }

    .player-label {
        font-size: 12px;
    }

    .player-label .you-tag {
        font-size: 9px;
        padding: 1px 4px;
    }

    .turn-indicator {
        font-size: 12px;
    }

    /* 棋盘容器 */
    .board-container {
        border-radius: 8px;
    }

    /* 按钮 */
    .buttons {
        gap: 10px;
        margin-top: 15px;
    }

    button.action-btn {
        padding: 10px 20px;
        font-size: 13px;
    }

    /* 游戏结果 */
    .game-result {
        margin-top: 15px;
        padding: 15px;
    }

    .game-result h2 {
        font-size: 20px;
    }

    .game-result p {
        font-size: 12px;
    }

    .game-result-buttons button {
        padding: 8px 16px;
        font-size: 12px;
    }

    /* 思考动画 */
    .thinking {
        padding: 10px;
        margin-top: 10px;
        font-size: 12px;
    }

    /* AI压迫感面板 - 手机版简化 */
    .ai-pressure-panel {
        width: 100%;
        padding: 12px;
        border-radius: 10px;
    }

    .ai-pressure-panel.show {
        display: block !important;
    }

    .pressure-header {
        margin-bottom: 10px;
        padding-bottom: 8px;
    }

    .pressure-icon {
        font-size: 16px;
    }

    .pressure-title {
        font-size: 12px;
    }

    .pressure-formula {
        font-size: 10px;
        padding: 10px;
        min-height: 50px;
        margin-bottom: 10px;
    }

    .pressure-stats {
        flex-direction: row;
        flex-wrap: wrap;
        gap: 5px;
    }

    .pressure-stats .stat {
        flex: 1;
        min-width: 80px;
        background: rgba(0,0,0,0.2);
        padding: 6px 8px;
        border-radius: 6px;
    }

    .pressure-stats .stat-label {
        font-size: 10px;
    }

    .pressure-stats .stat-value {
        font-size: 12px;
    }

    .pressure-tip {
        font-size: 10px;
        margin-top: 10px;
        padding-top: 8px;
    }

    /* 侧边栏 */
    .side-panel {
        padding: 15px;
        border-radius: 15px;
        width: 100%;
    }

    .side-panel h3 {
        font-size: 16px;
        margin-bottom: 12px;
    }

    .move-history {
        max-height: 150px;
        font-size: 12px;
    }

    .move-item {
        padding: 5px 8px;
    }

    .move-item .num {
        width: 20px;
        font-size: 10px;
    }

    .move-item .piece-icon {
        width: 12px;
        height: 12px;
        margin-right: 6px;
    }

    .stat-item {
        font-size: 12px;
    }

    /* 算法说明书弹窗 - 手机版 */
    .docs-overlay {
        padding: 15px 10px;
    }

    .docs-container {
        border-radius: 15px;
    }

    .docs-header {
        padding: 18px 15px;
    }

    .docs-header h2 {
        font-size: 16px;
    }

    .docs-close {
        width: 32px;
        height: 32px;
        font-size: 20px;
    }

    .docs-content {
        padding: 15px;
    }

    .docs-toc {
        padding: 15px;
        margin-bottom: 20px;
    }

    .docs-toc h3 {
        font-size: 14px;
        margin-bottom: 12px;
    }

    .docs-toc ul {
        gap: 8px;
    }

    .docs-toc li a {
        padding: 6px 12px;
        font-size: 11px;
    }

    .docs-section {
        margin-bottom: 25px;
        padding-bottom: 20px;
    }

    .docs-section h3 {
        font-size: 18px;
        margin-bottom: 15px;
    }

    .difficulty-tag {
        font-size: 10px;
        padding: 4px 10px;
    }

    .docs-card {
        padding: 15px;
        margin-bottom: 15px;
    }

    .docs-card h4 {
        font-size: 14px;
        margin-bottom: 10px;
    }

    .docs-card p {
        font-size: 13px;
        line-height: 1.6;
    }

    .docs-card ul {
        font-size: 13px;
        line-height: 1.8;
    }

    .formula-box {
        padding: 15px;
        margin: 12px 0;
    }

    .formula {
        font-size: 14px;
    }

    .formula-cases {
        font-size: 12px;
        padding-left: 15px;
    }

    .formula-desc {
        font-size: 11px;
    }

    .fun-fact {
        padding: 12px;
        gap: 10px;
    }

    .fact-icon {
        font-size: 20px;
    }

    .fun-fact p {
        font-size: 12px;
    }

    .score-table th,
    .score-table td {
        padding: 8px 5px;
        font-size: 12px;
    }

    .game-tree {
        padding: 12px;
    }

    .game-tree pre {
        font-size: 10px;
        line-height: 1.3;
    }

    .example-board {
        padding: 10px;
    }

    .example-board pre {
        font-size: 12px;
    }

    .direction-demo {
        gap: 20px;
    }

    .dir-arrow {
        font-size: 28px;
    }

    .code-block {
        padding: 12px;
    }

    .code-block pre {
        font-size: 11px;
    }

    .docs-footer {
        padding: 20px;
    }

    .docs-footer p {
        font-size: 14px;
    }
}

/* 超小屏幕 */
@media (max-width: 360px) {
    .start-screen h1 {
        font-size: 28px;
        letter-spacing: 3px;
    }

    .menu-container {
        padding: 15px 12px;
    }

    .menu-btn {
        padding: 12px 15px;
        font-size: 14px;
    }

    .color-btn .piece-preview {
        width: 35px;
        height: 35px;
    }

    .game-header h1 {
        font-size: 18px;
    }

    .player-info {
        gap: 5px;
    }

    .player-piece {
        width: 18px;
        height: 18px;
    }

    .player-label {
        font-size: 11px;
    }

    .turn-indicator {
        font-size: 11px;
        gap: 5px;
    }

    button.action-btn {
        padding: 8px 15px;
        font-size: 12px;
    }

    .docs-header h2 {
        font-size: 14px;
    }

    .docs-section h3 {
        font-size: 16px;
    }

    .formula {
        font-size: 12px;
    }

    .game-tree pre {
        font-size: 9px;
    }
}