/* ========================================
   2048游戏 - Canvas版样式表
   ======================================== */

/* ========================================
   1. 基础样式与布局
   ======================================== */

/* 全局样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background-color: #F5F5F5;
    color: #555;
    margin: 0;
    padding: 20px;
    font-size: 18px;
}

/* 主容器 */
.container {
    max-width: 500px;
    margin: 0 auto;
    border-radius: 10px;
    padding: 15px;
}

/* ========================================
   2. 页头区域 - 标题与分数
   ======================================== */

/* 页头布局 */
header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 20px;
    margin-bottom: 24px;
    padding: 5px 0;
}

/* 游戏标题 */
h1 {
    font-size: 52px;
    font-weight: 800;
    margin: 0;
    color: #776e65;
    letter-spacing: 1px;
}

/* 分数容器 */
.scores-container {
    justify-self: end;
    display: flex;
    gap: 12px;
}

/* 分数盒子样式 */
.score-box {
    position: relative;
    background: #bbada0;
    padding: 10px 20px;
    border-radius: 8px;
    color: #fff;
    min-width: 90px;
    text-align: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s ease;
    overflow: hidden; /* 防止分数动画撑开容器 */
}

.score-box:hover {
    transform: translateY(-2px);
}

/* 分数标题 */
.score-title {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 2px;
    color: #eee4da;
}

/* 分数数值 */
#score, #best-score {
    font-size: 24px;
    font-weight: bold;
}

/* ========================================
   3. 分数动画效果
   ======================================== */

/* 分数增加动画 */
.score-addition {
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    color: #FFD700;
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.5);
    font-size: 24px;
    font-weight: bold;
    z-index: 100;
    animation: score-pop 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    pointer-events: none;
}

/* 马卡龙主题下的分数动画色彩调整 */
body.theme-pastel .score-addition {
    color: #d81b60;
    text-shadow: 0 0 10px rgba(216, 27, 96, 0.35);
}

/* 分数弹出动画关键帧 */
@keyframes score-pop {
    0% {
        transform: translate(-50%, -50%) scale(0.8);
        opacity: 0;
    }
    20% {
        transform: translate(-50%, -50%) scale(1.2);
        opacity: 1;
    }
    100% {
        transform: translate(-50%, -50%) scale(1) translateY(-30px);
        opacity: 0;
    }
}

/* ========================================
   4. 控制区域 - 按钮与选择器
   ======================================== */

/* 游戏介绍和按钮区域 */
.above-game {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.game-intro {
    margin: 0;
    line-height: 1.2;
}

/* 重试按钮样式 */
.retry-button {
    background-color: #8f7a66; /* 经典按钮色 */
    color: white;
    border: none;
    border-radius: 5px;
    padding: 10px 20px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 3px 0 #6f5f52;
    transition: all 0.2s;
    font-family: inherit;
}

.retry-button:hover {
    background-color: #7c6a59;
    transform: translateY(-2px);
    box-shadow: 0 5px 0 #6f5f52;
}

.retry-button:active {
    transform: translateY(1px);
    box-shadow: 0 2px 0 #6f5f52;
}

/* 游戏控制区域布局 */
.game-controls {
    display: flex;
    justify-content: center; /* 居中显示 */
    align-items: center;
    gap: 20px; /* 增加间距 */
    width: 100%;
    margin: 20px 0;
}

/* 主题和难度选择器 */
.theme-selector, .difficulty-selector {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
}

/* 选择器标签 */
.difficulty-selector label, .theme-selector label {
    color: #666;
    font-weight: 700; /* PC端加粗 */
}

/* 选择器下拉框 */
.difficulty-selector select, .theme-selector select {
    padding: 8px 12px;
    border: 2px solid #8f7a66; /* 经典主题主色 */
    border-radius: 5px;
    background-color: #ffffff;
    color: #8f7a66;
    font-family: inherit;
    font-size: 14px;
    cursor: pointer;
    outline: none;
    transition: all 0.2s;
}

.difficulty-selector select:hover, .theme-selector select:hover {
    background-color: #F5F5F5;
}

.difficulty-selector select:focus, .theme-selector select:focus {
    border-color: #8f7a66;
    box-shadow: 0 0 0 2px rgba(143, 122, 102, 0.2);
}


/* ========================================
   5. 游戏画面区域
   ======================================== */

/* 游戏容器 */
.game-container {
    position: relative;
    background: linear-gradient(135deg, #E0F7FA 0%, #B2EBF2 100%);
    border-radius: 15px;
    width: 100%;
    height: 0;
    padding-bottom: 100%; /* 保持正方形比例 */
    margin-bottom: 20px;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease;
}

.game-container:hover {
    transform: translateY(-2px);
}

/* Canvas绘图元素 */
#game-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    touch-action: none; /* 防止触摸设备上的默认行为 */
}

/* 游戏开始遮罩层 */
.game-start-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 15px;
    z-index: 50;
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    transition: opacity 0.3s ease;
}

.game-start-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

/* 开始游戏按钮 */
.start-game-button {
    background-color: #8f7a66;
    color: white;
    border: none;
    border-radius: 12px;
    padding: 16px 32px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    box-shadow: 0 6px 0 #6f5f52, 0 8px 20px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
    font-family: inherit;
}

.start-game-button:hover {
    background-color: #a08977;
    transform: translateY(-2px);
    box-shadow: 0 8px 0 #6f5f52, 0 10px 25px rgba(0, 0, 0, 0.3);
}

.start-game-button:active {
    transform: translateY(2px);
    box-shadow: 0 4px 0 #6f5f52, 0 6px 15px rgba(0, 0, 0, 0.2);
}


/* ========================================
   6. 游戏状态提示
   ======================================== */

/* 游戏结束/胜利消息 */
.game-message {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(255, 255, 255, 0.8);
    z-index: 100;
    text-align: center;
    animation: fade-in 0.5s;
    border-radius: 10px;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

/* 消息文字 */
.game-message p {
    font-size: 36px;
    font-weight: bold;
    margin: 0;
    position: absolute;
    top: 30%;
    left: 0;
    right: 0;
    color: inherit;
}

/* 消息操作按钮 */
.game-message .actions {
    position: absolute;
    top: 60%;
    left: 0;
    right: 0;
}

/* 胜利状态样式 */
.game-message.game-won {
    background-color: rgba(237, 255, 188, 0.9);
    color: #FFD54F; /* 金色 */
}

/* 游戏结束状态样式 */
.game-message.game-over {
    background-color: rgba(0, 0, 0, 0.6);
    color: #ffffff;
}

/* 暗色与霓虹主题下，为了与深背景拉开层次，使用主题色微透明遮罩 */
body.theme-dark .game-message.game-over {
    background-color: rgba(124, 77, 255, 0.18);
    color: #E0E6ED;
}

body.theme-neon .game-message.game-over {
    background-color: rgba(255, 46, 136, 0.22);
    color: #FFFFFF;
}


/* ========================================
   7. 游戏说明区域
   ======================================== */

/* 游戏说明文字 */
.game-explanation {
    margin-top: 20px;
    border-top: 1px solid #E0E0E0;
    padding-top: 15px;
    font-size: 16px;
    color: #777;
    line-height: 1.5;
}

/* ========================================
   8. 动画效果
   ======================================== */

/* 淡入动画 */
@keyframes fade-in {
    0% { opacity: 0; }
    100% { opacity: 1; }
}


/* ========================================
   9. 响应式设计 - 移动设备适配
   ======================================== */

@media screen and (max-width: 520px) {
    /* 基础布局调整 */
    body {
        font-size: 16px;
        padding: 10px;
    }
    
    /* 页头区域调整 */
    header {
        gap: 12px;
    }
    
    h1 {
        font-size: 36px;
        letter-spacing: 1px;
    }
    
    /* 分数区域调整 */
    .score-box {
        padding: 5px 10px;
        min-width: 60px;
    }
    
    #score, #best-score {
        font-size: 18px;
    }
    
    /* 游戏介绍调整 */
    .game-intro {
        font-size: 14px;
    }
    
    /* 按钮调整 */
    .retry-button {
        padding: 8px 15px;
        font-size: 14px;
    }
    
    /* 开始游戏按钮调整 */
    .start-game-button {
        padding: 14px 28px;
        font-size: 18px;
    }
    
    /* 游戏消息调整 */
    .game-message p {
        font-size: 28px;
    }
    
    /* 说明文字调整 */
    .game-explanation {
        font-size: 14px;
    }
    
    /* 控制区域调整 */
    .game-controls {
        flex-direction: row; /* 保持水平布局 */
        flex-wrap: nowrap; /* 防止换行 */
        gap: 8px; /* 减小间距 */
    }

    .difficulty-selector {
        justify-content: space-between;
    }

    /* 移动端显示标签，现在位置够了 */
    .difficulty-selector label,
    .theme-selector label {
        display: inline;
        font-size: 14px;
    }

    .difficulty-selector select, .theme-selector select {
        max-width: 100px; /* 增加选择框宽度 */
        padding: 8px 10px;
    }

    /* 移动端显示控制 */
    .desktop-only {
        display: none !important;
    }

    .mobile-only,
    .mobile-github-link.mobile-only {
        display: block !important;
    }
}


/* ========================================
   10. 主题样式 - 暗色主题
   ======================================== */

body.theme-dark {
    background-color: #0E141B;
    color: #E0E6ED;
}

/* 暗色主题下的标题色彩 */
body.theme-dark h1 { 
    color: #E0E6ED; 
}

/* 暗色主题下的分数容器 */
body.theme-dark .score-box {
    background: linear-gradient(135deg, #00BCD4 0%, #7C4DFF 100%);
}

/* 暗色主题下的游戏容器 */
body.theme-dark .game-container {
    background: linear-gradient(135deg, #1B2730 0%, #0F1A22 100%);
    box-shadow: 0 8px 20px rgba(124, 77, 255, 0.3), 0 4px 10px rgba(0, 0, 0, 0.5);
}

/* 暗色主题下的按钮样式 */
body.theme-dark #new-game-button, 
body.theme-dark .retry-button,
body.theme-dark .start-game-button {
    background-color: #7C4DFF;
    box-shadow: 0 3px 0 #4A2DB6;
}

body.theme-dark #new-game-button:hover, 
body.theme-dark .retry-button:hover,
body.theme-dark .start-game-button:hover {
    background-color: #6A3FF0;
    box-shadow: 0 5px 0 #4A2DB6;
}

/* 暗色主题下的下拉框样式 */
.theme-dark .difficulty-selector select,
.theme-dark .theme-selector select {
    background-color: #111821;
    border-color: #7C4DFF;
    color: #E0E6ED;
}

.theme-dark .difficulty-selector select:focus,
.theme-dark .theme-selector select:focus {
    box-shadow: 0 0 0 2px rgba(124, 77, 255, 0.25);
}

/* 暗色主题下的遮罩层 */
body.theme-dark .game-start-overlay {
    background: rgba(30, 30, 35, 0.95);
}

/* 暗色主题下的 GitHub 链接 */
body.theme-dark .github-link.desktop-only {
    background: rgba(224, 230, 237, 0.9);
}

body.theme-dark .github-link.desktop-only:hover {
    background: rgba(224, 230, 237, 1);
}

body.theme-dark .mobile-github-link a {
    background: #1B2730;
    border-color: #7C4DFF;
    color: #E0E6ED;
}

body.theme-dark .mobile-github-link a:hover {
    background: #2A3A47;
    color: #FFFFFF;
}

/* 深色主题下移动端GitHub图标使用白色 */
body.theme-dark .github-icon-mobile {
    fill: #FFFFFF !important;
}


/* ========================================
   11. 主题样式 - 马卡龙主题
   ======================================== */

body.theme-pastel {
    background-color: #FFF7FB;
    color: #555;
}

/* 马卡龙主题下的标题色彩 */
body.theme-pastel h1 { 
    color: #81C784; 
}

/* 马卡龙主题下的分数容器 */
body.theme-pastel .score-box {
    background: linear-gradient(135deg, #FFD1DC 0%, #FEC8D8 100%);
    color: #4a4a4a; /* 提高对比 */
}

body.theme-pastel #score,
body.theme-pastel #best-score {
    color: #2f2f2f;
}

body.theme-pastel .score-title {
    color: #6b6b6b;
}

/* 马卡龙主题下的游戏容器 */
body.theme-pastel .game-container {
    background: linear-gradient(135deg, #F9F7F7 0%, #F1F1F1 100%);
}

/* 马卡龙主题下的按钮样式 */
body.theme-pastel #new-game-button, 
body.theme-pastel .retry-button,
body.theme-pastel .start-game-button {
    background-color: #81C784;
    box-shadow: 0 3px 0 #4C8C4A;
}

body.theme-pastel #new-game-button:hover, 
body.theme-pastel .retry-button:hover,
body.theme-pastel .start-game-button:hover {
    background-color: #66BB6A;
    box-shadow: 0 5px 0 #4C8C4A;
}

/* 马卡龙主题下的下拉框样式 */
.theme-pastel .difficulty-selector select,
.theme-pastel .theme-selector select {
    background-color: #FFFFFF;
    border-color: #81C784;
    color: #81C784;
}

.theme-pastel .difficulty-selector select:focus,
.theme-pastel .theme-selector select:focus {
    box-shadow: 0 0 0 2px rgba(129, 199, 132, 0.25);
}

/* 马卡龙主题下的遮罩层 */
body.theme-pastel .game-start-overlay {
    background: rgba(255, 255, 255, 0.98);
}

/* 马卡龙主题下的 GitHub 链接 */
body.theme-pastel .github-link.desktop-only {
    background: rgba(255, 255, 255, 0.95);
}

body.theme-pastel .github-link.desktop-only:hover {
    background: rgba(255, 255, 255, 1);
}

body.theme-pastel .mobile-github-link a {
    background: #FFFFFF;
    border-color: #81C784;
    color: #81C784;
}

body.theme-pastel .mobile-github-link a:hover {
    background: #F1F8E9;
    color: #66BB6A;
}


/* ========================================
   12. 主题样式 - 霓虹主题
   ======================================== */

body.theme-neon {
    background-color: #0B0F19;
    color: #E6EAF3;
}

/* 霓虹主题下的标题色彩 */
body.theme-neon h1 { 
    color: #FF2E88; 
}

/* 霓虹主题下的分数容器 */
body.theme-neon .score-box {
    background: linear-gradient(135deg, #00E5FF 0%, #FF00CC 100%);
}

/* 霓虹主题下的游戏容器 */
body.theme-neon .game-container {
    background: linear-gradient(135deg, #15162B 0%, #0C0D1A 100%);
    box-shadow: 0 8px 20px rgba(255, 46, 136, 0.4), 0 4px 10px rgba(0, 188, 212, 0.3), 0 0 30px rgba(255, 46, 136, 0.1);
}

/* 霓虹主题下的按钮样式 */
body.theme-neon #new-game-button, 
body.theme-neon .retry-button,
body.theme-neon .start-game-button {
    background-color: #FF2E88;
    box-shadow: 0 3px 0 #A11353;
}

body.theme-neon #new-game-button:hover, 
body.theme-neon .retry-button:hover,
body.theme-neon .start-game-button:hover {
    background-color: #E91E63;
    box-shadow: 0 5px 0 #A11353;
}

/* 霓虹主题下的下拉框样式 */
.theme-neon .difficulty-selector select,
.theme-neon .theme-selector select {
    background-color: #0E1422;
    border-color: #FF2E88;
    color: #FF2E88;
}

.theme-neon .difficulty-selector select:focus,
.theme-neon .theme-selector select:focus {
    box-shadow: 0 0 0 2px rgba(255, 46, 136, 0.25);
}

/* 霓虹主题下的遮罩层 */
body.theme-neon .game-start-overlay {
    background: rgba(11, 15, 25, 0.95);
}

/* 霓虹主题下的 GitHub 链接 */
body.theme-neon .github-link.desktop-only {
    background: rgba(230, 234, 243, 0.9);
}

body.theme-neon .github-link.desktop-only:hover {
    background: rgba(230, 234, 243, 1);
}

body.theme-neon .mobile-github-link a {
    background: #15162B;
    border-color: #FF2E88;
    color: #E6EAF3;
}

body.theme-neon .mobile-github-link a:hover {
    background: #1F2037;
    color: #FFFFFF;
}

/* 霓虹主题下移动端GitHub图标使用白色 */
body.theme-neon .github-icon-mobile {
    fill: #FFFFFF !important;
}


/* ========================================
   14. GitHub 链接样式
   ======================================== */

/* 桌面端 GitHub 链接 - 右上角 */
.github-link.desktop-only {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 1000;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.9);
    border-radius: 50%;
    color: #333;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.github-link.desktop-only:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* 移动端 GitHub 链接 - 底部 */
.mobile-github-link.mobile-only {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #E0E0E0;
    text-align: center;
    display: none; /* 默认隐藏 */
}

.mobile-github-link a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 6px;
    color: #495057;
    text-decoration: none;
    font-size: 14px;
    transition: all 0.2s ease;
}

.mobile-github-link a:hover {
    background: #e9ecef;
    border-color: #adb5bd;
    color: #212529;
}

/* 响应式显示控制 */
.desktop-only {
    display: flex;
}

.mobile-only {
    display: none;
}

/* ========================================
   15. 超小屏幕适配 (320px 以下)
   ======================================== */

@media screen and (max-width: 320px) {
    h1 {
        font-size: 30px;
    }
    
    .score-box {
        min-width: 50px;
    }
    
    .game-message p {
        font-size: 22px;
    }
}