/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 根变量定义 - macOS风格色彩 */
:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --success-color: #34C759;
    --warning-color: #FF9500;
    --error-color: #FF3B30;
    --background-color: #F2F2F7;
    --surface-color: #FFFFFF;
    --text-primary: #000000;
    --text-secondary: #8E8E93;
    --border-color: #C6C6C8;
    --shadow-light: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 12px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --border-radius-small: 8px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #000000;
        --surface-color: #1C1C1E;
        --text-primary: #FFFFFF;
        --text-secondary: #8E8E93;
        --border-color: #38383A;
    }
}

/* 基础字体和布局 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 主容器 */
.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1200px;
    margin: 0 auto;
}

/* 头部样式 */
.header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.user-info {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.user-name {
    padding: 0.5rem 1rem;
    background-color: var(--background-color);
    border-radius: var(--border-radius-small);
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* 主内容区域 */
.main-content {
    flex: 1;
    padding: 2rem;
}

/* 欢迎页面 */
.welcome-screen {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.welcome-content h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.welcome-content p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

/* 难度选择 */
.difficulty-selection h3 {
    font-size: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.difficulty-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.difficulty-btn {
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    display: flex;
    align-items: center;
    gap: 1.5rem;
    box-shadow: var(--shadow-light);
}

.difficulty-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-medium);
    transform: translateY(-2px);
}

.difficulty-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.btn-text h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.btn-text p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* 游戏界面 */
.game-screen {
    max-width: 900px;
    margin: 0 auto;
}

.game-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.back-btn {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-small);
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
    color: var(--text-primary);
}

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

.game-info {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.current-level {
    font-weight: 600;
    color: var(--primary-color);
}

.score {
    font-weight: 600;
    color: var(--success-color);
}

/* 初级游戏界面 */
.poem-display {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-light);
}

.poem-info {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.poem-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.poem-author {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.poem-content {
    font-size: 1.3rem;
    line-height: 2;
    text-align: center;
    font-family: 'STSong', 'SimSun', serif;
}

.poem-line {
    margin-bottom: 0.8rem;
    padding: 0.5rem;
    border-radius: var(--border-radius-small);
}

.missing-line {
    background-color: var(--background-color);
    border: 2px dashed var(--border-color);
    color: var(--text-secondary);
    font-style: italic;
}

/* 选项容器 */
.options-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.option-btn {
    background-color: var(--surface-color);
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.1rem;
    text-align: center;
    font-family: 'STSong', 'SimSun', serif;
}

.option-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-light);
}

.option-btn.selected {
    border-color: var(--primary-color);
    background-color: rgba(0, 122, 255, 0.1);
}

.option-btn.correct {
    border-color: var(--success-color);
    background-color: rgba(52, 199, 89, 0.1);
}

.option-btn.incorrect {
    border-color: var(--error-color);
    background-color: rgba(255, 59, 48, 0.1);
}

.option-btn:disabled {
    cursor: not-allowed;
    opacity: 0.8;
}

/* 游戏控制按钮 */
.game-controls {
    text-align: center;
    margin-top: 2rem;
}

.submit-btn, .next-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin: 0 0.5rem;
}

.submit-btn:hover:not(:disabled), .next-btn:hover {
    background-color: #0056CC;
    transform: translateY(-1px);
}

.submit-btn:disabled {
    background-color: var(--text-secondary);
    cursor: not-allowed;
    transform: none;
}

/* 结果反馈 */
.result-feedback {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    cursor: pointer;
}

.feedback-content {
    background-color: var(--surface-color);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    max-width: 400px;
    box-shadow: var(--shadow-medium);
    cursor: pointer;
}

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

.feedback-text {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.character-animation {
    animation: bounce 1s ease-in-out;
}

.character {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.thanks-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* 排行榜样式 */
.leaderboard-screen {
    padding: 20px;
    max-width: 800px;
    margin: 0 auto;
}

.leaderboard-title {
    text-align: center;
    color: #2c3e50;
    margin-bottom: 30px;
    font-size: 28px;
    font-weight: bold;
}

.leaderboard-tabs {
    display: flex;
    justify-content: center;
    margin-bottom: 30px;
    background: #f8f9fa;
    border-radius: 25px;
    padding: 5px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.tab-btn {
    flex: 1;
    padding: 12px 20px;
    border: none;
    background: transparent;
    color: #6c757d;
    cursor: pointer;
    border-radius: 20px;
    transition: all 0.3s ease;
    font-weight: 500;
    font-size: 14px;
}

.tab-btn:hover {
    color: #495057;
    background: rgba(255,255,255,0.5);
}

.tab-btn.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* 排行榜列表容器 */
#leaderboardList {
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    overflow: hidden;
}

/* 排行榜项目 */
.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 20px;
    border-bottom: 1px solid #f1f3f4;
    transition: all 0.3s ease;
    position: relative;
}

.leaderboard-item:last-child {
    border-bottom: none;
}

.leaderboard-item:hover {
    background: linear-gradient(135deg, #f8f9ff 0%, #f0f4ff 100%);
    transform: translateX(5px);
}

/* 前三名特殊样式 */
.leaderboard-item.top-rank {
    background: linear-gradient(135deg, #fff9e6 0%, #fff3d3 100%);
    border-left: 4px solid #ffd700;
}

.leaderboard-item.top-rank:hover {
    background: linear-gradient(135deg, #fff7cc 0%, #ffefb3 100%);
}

/* 当前用户特殊样式 */
.leaderboard-item.current-user {
    background: linear-gradient(135deg, #e8f5e8 0%, #d4f1d4 100%);
    border-left: 4px solid #34C759;
    box-shadow: 0 2px 8px rgba(52, 199, 89, 0.2);
}

.leaderboard-item.current-user:hover {
    background: linear-gradient(135deg, #ddf2dd 0%, #c8edc8 100%);
    transform: translateX(5px);
}

/* 当前用户且是前三名的样式 */
.leaderboard-item.current-user.top-rank {
    background: linear-gradient(135deg, #fff9e6 0%, #e8f5e8 50%, #d4f1d4 100%);
    border-left: 4px solid #ffd700;
    box-shadow: 0 2px 8px rgba(255, 215, 0, 0.3);
}

/* 排名区域 */
.rank {
    display: flex;
    align-items: center;
    min-width: 80px;
    margin-right: 20px;
}

.rank-icon {
    font-size: 24px;
    margin-right: 8px;
}

.rank-number {
    font-size: 18px;
    font-weight: bold;
    color: #2c3e50;
    min-width: 30px;
}

/* 玩家信息区域 */
.player-info {
    flex: 1;
    margin-right: 20px;
}

.player-name {
    font-size: 18px;
    font-weight: bold;
    color: #2c3e50;
    margin-bottom: 5px;
}

.player-stats {
    display: flex;
    gap: 20px;
    font-size: 14px;
    color: #6c757d;
}

.score {
    color: #28a745;
    font-weight: 600;
}

.accuracy {
    color: #17a2b8;
    font-weight: 600;
}

/* 游戏时间 */
.play-time {
    font-size: 14px;
    color: #6c757d;
    font-weight: 500;
    min-width: 80px;
    text-align: right;
}

/* 空排行榜状态 */
.empty-leaderboard {
    text-align: center;
    padding: 60px 20px;
    color: #6c757d;
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
    opacity: 0.7;
}

.empty-leaderboard p {
    margin: 10px 0;
    font-size: 16px;
}

.empty-leaderboard p:first-of-type {
    font-size: 18px;
    font-weight: 600;
    color: #495057;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .leaderboard-screen {
        padding: 15px;
    }
    
    .leaderboard-title {
        font-size: 24px;
        margin-bottom: 20px;
    }
    
    .leaderboard-tabs {
        margin-bottom: 20px;
    }
    
    .tab-btn {
        padding: 10px 15px;
        font-size: 13px;
    }
    
    .leaderboard-item {
        padding: 15px;
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .rank {
        margin-right: 0;
        margin-bottom: 5px;
    }
    
    .player-info {
        margin-right: 0;
        width: 100%;
    }
    
    .player-stats {
        flex-direction: column;
        gap: 5px;
    }
    
    .play-time {
        align-self: flex-end;
        min-width: auto;
    }
    
    .empty-leaderboard {
        padding: 40px 20px;
    }
    
    .empty-icon {
        font-size: 48px;
    }
}

@media (max-width: 480px) {
    .leaderboard-tabs {
        flex-direction: column;
        gap: 5px;
    }
    
    .tab-btn {
        border-radius: 10px;
    }
    
    .player-name {
        font-size: 16px;
    }
    
    .rank-number {
        font-size: 16px;
    }
    
    .rank-icon {
        font-size: 20px;
    }
}

/* 通关完成页面样式 */
.completion-container {
    text-align: center;
    padding: 40px 20px;
    max-width: 600px;
    margin: 0 auto;
}

.completion-header h2 {
    color: #2c3e50;
    font-size: 2.5em;
    margin-bottom: 10px;
}

.completion-header p {
    color: #7f8c8d;
    font-size: 1.2em;
    margin-bottom: 30px;
}

.completion-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin: 30px 0;
    flex-wrap: wrap;
}

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

.stat-label {
    display: block;
    color: #7f8c8d;
    font-size: 0.9em;
    margin-bottom: 5px;
}

.stat-value {
    display: block;
    color: #2c3e50;
    font-size: 2em;
    font-weight: bold;
}

.completion-message {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 20px;
    margin: 30px 0;
    line-height: 1.6;
}

.completion-message p {
    margin: 10px 0;
    color: #2c3e50;
}

.completion-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

/* 反馈表单样式 */
.feedback-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 40px 20px;
}

.feedback-header {
    text-align: center;
    margin-bottom: 30px;
}

.feedback-header h2 {
    color: #2c3e50;
    font-size: 2em;
    margin-bottom: 10px;
}

.feedback-header p {
    color: #7f8c8d;
    font-size: 1.1em;
}

.feedback-form {
    background: #f8f9fa;
    border-radius: 10px;
    padding: 30px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: #2c3e50;
    font-weight: bold;
    margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 2px solid #e9ecef;
    border-radius: 8px;
    font-size: 1em;
    transition: border-color 0.3s ease;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3498db;
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
    flex-wrap: wrap;
}

/* 反馈成功页面样式 */
.feedback-success {
    text-align: center;
    padding: 60px 20px;
    max-width: 500px;
    margin: 0 auto;
}

.success-icon {
    font-size: 4em;
    margin-bottom: 20px;
}

.feedback-success h2 {
    color: #27ae60;
    font-size: 2em;
    margin-bottom: 15px;
}

.feedback-success p {
    color: #7f8c8d;
    font-size: 1.1em;
    line-height: 1.6;
    margin-bottom: 30px;
}

.success-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式优化 */
.btn-primary, .btn-secondary {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1em;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
    transform: translateY(-2px);
}

.btn-primary:disabled {
    background: #bdc3c7;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: #95a5a6;
    color: white;
}

.btn-secondary:hover {
    background: #7f8c8d;
    transform: translateY(-2px);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .completion-stats {
        gap: 20px;
    }
    
    .completion-actions,
    .form-actions,
    .success-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary,
    .btn-secondary {
        width: 200px;
    }
    
    .feedback-form {
        padding: 20px;
    }
}

/* 底部导航样式 */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 1rem 2rem;
    position: sticky;
    bottom: 0;
    z-index: 100;
    backdrop-filter: blur(20px);
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

.bottom-nav {
    display: flex;
    justify-content: center;
    gap: 2rem;
    max-width: 400px;
    margin: 0 auto;
}

.nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    background: none;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    border-radius: var(--border-radius-small);
    color: var(--text-secondary);
    min-width: 80px;
}

.nav-btn:hover {
    background-color: var(--background-color);
    color: var(--text-primary);
    transform: translateY(-2px);
}

.nav-btn.active {
    color: var(--primary-color);
    background-color: rgba(0, 122, 255, 0.1);
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-text {
    font-size: 0.9rem;
    font-weight: 500;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        padding: 1rem;
    }
    
    .header {
        padding: 1rem;
    }
    
    .welcome-content h2 {
        font-size: 2rem;
    }
    
    .difficulty-buttons {
        grid-template-columns: 1fr;
    }
    
    .difficulty-btn {
        padding: 1.5rem;
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
    
    .game-header {
        flex-direction: column;
        gap: 1rem;
        align-items: stretch;
    }
    
    .game-info {
        justify-content: space-between;
    }
    
    .options-container {
        grid-template-columns: 1fr;
    }
    
    .bottom-nav {
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .poem-display {
        padding: 1.5rem;
    }
    
    .poem-content {
        font-size: 1.1rem;
    }
    
    .option-btn {
        padding: 1rem;
        font-size: 1rem;
    }
    
    .feedback-content {
        padding: 2rem;
        margin: 1rem;
    }
}