:root {
    /* 主色调 - 蓝色和绿色 */
    --primary-color: #2196f3;
    --primary-light: #4caf50;
    --primary-dark: #1976d2;
    --primary-gradient: var(--primary-color);

    /* 辅助色 */
    --success-color: #4caf50;
    --warning-color: #ff9800;
    --error-color: #f44336;
    --info-color: #2196f3;

    /* 中性色 */
    --text-primary: #2c3e50;
    --text-secondary: #6c757d;
    --text-light: #95a5a6;
    --bg-primary: #f8f9fa;
    --bg-white: #ffffff;
    --bg-dark: #343a40;

    /* 边框和阴影 */
    --border-color: #e8f0fe;
    --border-radius: 12px;
    --border-radius-lg: 20px;
    --box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    --box-shadow-hover: 0 8px 30px rgba(0, 0, 0, 0.12);
    --box-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.15);

    /* 过渡效果 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* 结果页面渐变 */
    --result-gradient: linear-gradient(135deg, #2196f3, #1976d2);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #f6f9fc 0%, #eef2f6 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.main-container {
    max-width: 900px;
    margin: 2rem auto;
}

.card {
    background: rgba(255, 255, 255, 0.98);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
    overflow: hidden;
    padding: 0;
    margin-bottom: 20px;
}

.card:hover {
    box-shadow: var(--box-shadow-hover);
}

.hidden {
    display: none !important;
}

.section {
    transition: opacity 0.3s ease;
}

.card-header {
    padding: 1.75rem 2rem;
    background: var(--primary-gradient);
    text-align: center;
    border-bottom: none;
}

.card-title {
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.card-desc {
    color: rgba(255, 255, 255, 0.85);
    font-size: 0.95rem;
}

.card-body {
    padding: 2rem;
}

/* 表单样式 */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.form-input {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: white;
    transition: var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

.form-select {
    width: 100%;
    padding: 0.875rem 1rem;
    font-size: 1rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: white;
    cursor: pointer;
    transition: var(--transition-fast);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236c757d' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(33, 150, 243, 0.1);
}

/* 按钮样式 */
.btn {
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-family: inherit;
}

.btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.btn:active:not(:disabled) {
    transform: translateY(0);
}

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

.btn-icon {
    font-size: 1.125rem;
}

.btn-large {
    width: 100%;
    padding: 1rem;
    font-size: 1.125rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.3);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #1565c0 100%);
    box-shadow: 0 6px 16px rgba(33, 150, 243, 0.4);
}

.btn-secondary {
    background: var(--success-color);
    color: white;
    box-shadow: 0 4px 12px rgba(76, 175, 80, 0.3);
}

.btn-secondary:hover:not(:disabled) {
    background: #45a049;
    box-shadow: 0 6px 16px rgba(76, 175, 80, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
}

.btn-outline:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.btn-text {
    background: transparent;
    color: var(--text-secondary);
    border: none;
    padding: 0.5rem 1rem;
}

.btn-text:hover {
    color: var(--primary-color);
}

.btn-danger {
    color: var(--error-color);
}

.btn-danger:hover {
    color: #d32f2f;
}

/* 训练说明 */
.instructions {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
}

.instructions-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.instructions-list {
    list-style: none;
    padding-left: 0;
}

.instructions-list li {
    padding: 0.625rem 0;
    padding-left: 2rem;
    position: relative;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.instructions-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: 600;
}

/* 本地存储提示 */
.local-tip {
    background: linear-gradient(135deg, #e3f2fd 0%, #f8f9fa 100%);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-top: 1.5rem;
    border-left: 4px solid var(--primary-color);
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}

.tip-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.tip-content h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.tip-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* 游戏控制区域 */
.game-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 1px solid var(--border-color);
}

.control-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.control-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.control-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.timer-value {
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
    font-size: 1.75rem;
}

.time-highlight {
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}

.game-controls .btn {
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
}

/* 数字网格 */
.numbers-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 2rem;
    justify-content: center;
}

.number-cell {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.125rem;
    font-weight: 600;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: white;
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
}

.number-cell:hover:not(.found):not(.disabled) {
    border-color: var(--primary-color);
    background: #e3f2fd;
    transform: scale(1.05);
}

.number-cell.found {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
    cursor: default;
    transform: none;
}

.number-cell.wrong {
    background: var(--error-color);
    border-color: var(--error-color);
    color: white;
    animation: shake 0.3s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

/* 结果页面 */
.result-header {
    text-align: center;
    padding: 2rem;
    background: var(--result-gradient);
    color: white;
}

.result-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    animation: bounce 1s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.result-title {
    color: white;
    font-size: 1.75rem;
    font-weight: 700;
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    padding: 2rem;
    background: var(--bg-primary);
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: var(--border-radius);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: var(--transition-normal);
}

.stat-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.level-badge {
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    color: white;
    display: inline-block;
    font-size: 1.125rem;
    font-weight: 600;
}

.level-badge.优秀 {
    background: linear-gradient(135deg, #ffd700, #ffb900);
}

.level-badge.良好 {
    background: linear-gradient(135deg, #4caf50, #45a049);
}

.level-badge.正常 {
    background: linear-gradient(135deg, #2196f3, #1976d2);
}

.level-badge.需提升 {
    background: linear-gradient(135deg, #ff9800, #f57c00);
}

.result-feedback {
    padding: 2rem;
    border-top: 3px solid var(--primary-color);
}

.feedback-title {
    color: var(--text-primary);
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.feedback-content {
    color: var(--text-secondary);
    line-height: 1.8;
}

.result-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    padding: 2rem;
    border-top: 3px solid var(--primary-color);
}

.result-actions .btn {
    min-width: 140px;
}

/* 记录页面 */
.records-card {
    background: rgba(255, 255, 255, 0.98);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow);
    overflow: hidden;
}

.records-filter {
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-bottom: 1px solid var(--border-color);
}

.records-content {
    overflow-x: auto;
}

.records-list {
    padding: 2rem;
    max-height: 500px;
    overflow-y: auto;
}

.record-item {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.record-item:hover {
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(33, 150, 243, 0.1);
}

.record-name {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.record-details {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
}

.record-detail {
    text-align: center;
    padding: 0.75rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: var(--border-radius);
}

.record-detail .record-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.record-detail .record-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.record-detail .record-value.time-highlight {
    color: var(--primary-color);
    font-family: 'Courier New', monospace;
}

.record-level {
    text-align: center;
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    color: white;
    display: inline-block;
    font-weight: 600;
    margin-top: 1rem;
}

.record-level.优秀 {
    background: linear-gradient(135deg, #ffd700, #ffb900);
}

.record-level.良好 {
    background: linear-gradient(135deg, #4caf50, #45a049);
}

.record-level.正常 {
    background: linear-gradient(135deg, #2196f3, #1976d2);
}

.record-level.需提升 {
    background: linear-gradient(135deg, #ff9800, #f57c00);
}

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.empty-state-text {
    font-size: 1.125rem;
}

.empty,
.error {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.error {
    color: var(--error-color);
}

/* 记录操作按钮 */
.records-actions {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: center;
    border-top: 1px solid var(--border-color);
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-container {
        margin: 1rem;
    }

    .card-header,
    .card-body {
        padding: 1.5rem;
    }

    .card-title {
        font-size: 1.25rem;
    }

    .btn-large {
        padding: 0.875rem;
        font-size: 1rem;
    }

    .game-controls {
        padding: 1rem 1.5rem;
        gap: 1rem;
    }

    .control-value {
        font-size: 1.25rem;
    }

    .numbers-grid {
        gap: 0.4rem;
        padding: 1.5rem;
    }

    .number-cell {
        width: 35px;
        height: 35px;
        font-size: 1rem;
    }

    .result-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
        padding: 1.5rem;
    }

    .stat-value {
        font-size: 1.25rem;
    }

    .result-actions {
        flex-wrap: wrap;
    }

    .result-actions .btn {
        min-width: 120px;
        flex: 1 1 45%;
    }

    .record-details {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
    }

    .instructions-list li,
    .tip-content p {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .card-header {
        padding: 1.25rem;
    }

    .card-title {
        font-size: 1.125rem;
    }

    .card-body {
        padding: 1.25rem;
    }

    .numbers-grid {
        gap: 0.3rem;
        padding: 1rem;
    }

    .number-cell {
        width: 30px;
        height: 30px;
        font-size: 0.875rem;
    }

    .result-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .result-actions {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.75rem;
        padding: 1.5rem;
    }

    .result-actions .btn {
        min-width: 120px;
    }

    .local-tip {
        flex-direction: column;
        text-align: center;
    }

    .tip-icon {
        font-size: 2.5rem;
    }

    .instructions-list li {
        font-size: 0.875rem;
    }
}

/* 模态框样式 */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.modal.show {
    display: flex;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 999;
    display: none;
}

.modal-overlay.show {
    display: block;
}

.modal-content {
    background-color: white;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-close {
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--text-secondary);
    line-height: 1;
    padding: 0;
    width: 30px;
    height: 30px;
}

.btn-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 20px;
}

/* 排行榜样式 */
.leaderboard-controls {
    margin-bottom: 20px;
}

.leaderboard-controls .form-group {
    margin-bottom: 0;
}

.leaderboard-content {
    overflow-x: auto;
}

.loading {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-secondary);
}

.loading::after {
    content: '...';
    animation: dots 1.5s steps(4, end) infinite;
}

@keyframes dots {
    0%, 20% { content: '.'; }
    40% { content: '..'; }
    60%, 100% { content: '...'; }
}

/* 排行榜表格 */
.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: 12px;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.leaderboard-table th {
    background-color: var(--bg-primary);
    font-weight: 600;
    color: var(--text-primary);
}

.leaderboard-table tbody tr:hover {
    background-color: var(--bg-primary);
}

.leaderboard-table .rank {
    font-weight: bold;
    width: 60px;
}

.leaderboard-table .medal {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    margin-left: 5px;
    vertical-align: middle;
}

.leaderboard-table .medal.medal-1 {
    background: linear-gradient(135deg, #ffd700, #ffb900);
    box-shadow: 0 0 5px #ffd700;
}

.leaderboard-table .medal.medal-2 {
    background: linear-gradient(135deg, #c0c0c0, #a8a8a8);
    box-shadow: 0 0 5px #c0c0c0;
}

.leaderboard-table .medal.medal-3 {
    background: linear-gradient(135deg, #cd7f32, #a05a2c);
    box-shadow: 0 0 5px #cd7f32;
}

.leaderboard-table .user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.leaderboard-table .time {
    color: var(--primary-color);
    font-weight: 600;
}

.leaderboard-table .accuracy {
    color: var(--success-color);
    font-weight: 600;
}

/* 按钮组样式 */
.btn-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

@media (min-width: 768px) {
    .btn-group {
        flex-direction: row;
    }
}

.btn-group .btn {
    flex: 1;
}

/* 按钮小尺寸 */
.btn-small {
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
}

/* 镜像文字样式 */
.mirror-text {
    transform: scaleX(-1);
}

/* 结果网格 */
.result-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.75rem;
    max-height: 400px;
    overflow-y: auto;
}

.result-item {
    padding: 0.75rem 1rem;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.result-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.result-index {
    color: var(--text-secondary);
    font-size: 0.875rem;
    min-width: 30px;
}

.result-char {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 600;
    flex: 1;
}

/* 记录列表 - 参考101样式 */
.record-item {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: var(--border-radius);
    margin-bottom: 0.75rem;
    transition: var(--transition-fast);
}

.record-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.record-rank {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.125rem;
    margin-right: 1rem;
    background: var(--text-secondary);
    color: white;
}

.record-rank.rank-1 {
    background: linear-gradient(135deg, #ffd700, #ffb347);
}

.record-rank.rank-2 {
    background: linear-gradient(135deg, #c0c0c0, #a8a8a8);
}

.record-rank.rank-3 {
    background: linear-gradient(135deg, #cd7f32, #b8860b);
}

.record-info {
    flex: 1;
}

.record-name {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.record-date {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.record-time {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.125rem;
    margin-right: 1rem;
}

.empty-message {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* 进度条样式 */
.progress-container {
    padding: 1.5rem 2rem;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: #e0e0e0;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
}

.progress {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 10px;
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(33, 150, 243, 0.3);
}

.progress-text {
    text-align: center;
    margin-top: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
}

/* 数字显示区域 */
.number-display-area {
    padding: 3rem 2rem;
    background: var(--bg-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 200px;
}

.number-display {
    font-size: 5rem;
    font-weight: 700;
    color: var(--primary-color);
    display: inline-block;
    transition: transform 0.3s ease;
    font-family: 'Courier New', monospace;
    letter-spacing: 0.5rem;
    transform: scale(-1, 1);
}

/* 游戏按钮 */
.game-buttons {
    padding: 2rem;
    display: flex;
    gap: 1rem;
    justify-content: center;
    border-top: 1px solid var(--border-color);
}

/* 记录中的错误记录 */
.record-mistakes {
    font-size: 0.875rem;
    color: var(--warning-color);
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: rgba(255, 152, 0, 0.1);
    border-radius: 6px;
    border-left: 3px solid var(--warning-color);
}

/* 错误记录区域 */
.mistakes-section {
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: linear-gradient(135deg, #fff9c4 0%, #fff59d 100%);
    border-radius: var(--border-radius);
    border: 2px solid #ffd700;
}

.mistakes-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.mistakes-textarea {
    width: 100%;
    padding: 0.875rem;
    font-size: 1rem;
    border: 2px solid #ffd700;
    border-radius: var(--border-radius);
    background: white;
    transition: var(--transition-fast);
    font-family: inherit;
    resize: vertical;
    min-height: 80px;
    margin-bottom: 0.75rem;
}

.mistakes-textarea:focus {
    outline: none;
    border-color: #ffb300;
    box-shadow: 0 0 0 3px rgba(255, 179, 0, 0.1);
}

.mistakes-content {
    color: var(--text-primary);
    line-height: 1.8;
    padding: 0.75rem;
    background: white;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}