/* 卡片通用样式 */
.card_7ree {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease;
}

.card_content_7ree {
    background: linear-gradient(135deg, #0c276f 0%, #161a20 100%);
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    box-shadow: 
        0 10px 30px rgba(0, 0, 0, 0.7),
        0 0 40px rgba(0, 200, 200, 0.2), 
        inset 0 0 15px rgba(0, 155, 155, 0.1);
    border: 2px solid #13315e;
    max-width: 90%;
    width: 350px;
}

.card_title_7ree {
    font-size: 32px;
    margin: 0 0 10px 0;
    color: #00ffff; /* 默认青色 */
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.7);
    letter-spacing: 1px;
}

.card_btn_7ree {
    background-color: #1a2330;
    color: #00ffff;
    border: none;
    border-radius: 10px;
    padding: 12px 30px;
    font-size: 18px;
    cursor: pointer;
    transition: all 0.3s;
    display: inline-block;
    margin-top: 20px;
    outline: none;
    text-transform: uppercase;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3), inset 0 0 5px rgba(0, 200, 200, 0.2);
}

.card_btn_7ree:hover {
    background-color: #243040;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.3);
    transform: scale(1.05);
}

.card_btn_7ree:active {
    transform: scale(0.95);
    background-color: #222;
}

/* 欢迎卡片特殊样式 */
.welcome_card_7ree {
    /* 继承自.card_7ree */
}

.welcome_content_7ree {
    /* 继承自.card_content_7ree */
}

.welcome_title_7ree {
    /* 继承自.card_title_7ree - 保持青色 #00ffff */
}

.welcome_subtitle_7ree {
    font-size: 18px;
    color: #aaccff;
    margin: 30px auto;
}

/* 难度选择器样式 */
.difficulty_selector_7ree {
    margin-bottom: 25px;
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    position: relative;
}

.difficulty_selector_7ree label {
    color: #aaccff;
    margin-bottom: 8px;
    font-size: 16px;
    display: block;
    text-align: center;
}

/* 完全隐藏原生select样式 */
.difficulty_select_7ree {
    position: relative;
    z-index: 2;
    opacity: 0;
    height: 40px;
    width: 100%;
    max-width: 150px;
    cursor: pointer;
    /* 为兼容Firefox，确保下拉框使用自定义样式 */
    -moz-appearance: none;
    appearance: none;
    background-color: transparent;
    color: #00ffff;
}

/* 修改option元素样式 */
.difficulty_select_7ree option {
    background-color: #0c1624;
    color: #00ffff;
    padding: 10px 15px;
    text-align: center;
}

/* 选中的选项高亮显示 */
.difficulty_select_7ree option:checked {
    background-color: #00667a;
    color: #ffffff;
    font-weight: bold;
}

/* 为确保跨浏览器一致性，添加select容器和select伪元素的样式 */
select.difficulty_select_7ree::-ms-expand {
    display: none;
}

/* 修正下拉框样式，添加特定浏览器风格 */
@-moz-document url-prefix() {
    .difficulty_select_7ree {
        background-color: #0c1624;
        color: #00ffff;
        border: 1px solid #0c1624;
    }
    
    .difficulty_select_7ree option {
        background-color: #0c276f;
        color: #00ffff;
    }
}

/* 修正Webkit内核浏览器(Chrome)的下拉框样式 */
@media screen and (-webkit-min-device-pixel-ratio:0) {
    .difficulty_select_7ree option {
        background-color: #0c1624;
        color: #00ffff;
    }
    
    select.difficulty_select_7ree {
        background-color: #0c1624;
    }
}

/* 使用伪元素创建自定义select外观 */
.difficulty_selector_7ree::after {
    content: attr(data-text);  /* 使用data-text属性动态显示文本 */
    position: absolute;
    top: calc(50% + 4px);
    left: 50%;
    transform: translate(-50%, -50%);
    width: 150px;
    height: 40px;
    background-color: #1a2330;
    color: #00ffff;
    border: 1px solid #13315e;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3), inset 0 0 5px rgba(0, 200, 200, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    pointer-events: none;
    z-index: 1;
    padding-right: 15px; /* 为箭头留出空间 */
}

/* 下拉箭头 - 移动端 */
.difficulty_selector_7ree::before {
    content: "";
    position: absolute;
    top: calc(50% + 4px);
    right: calc(50% - 45px); /* 移动端右侧位置微调 */
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    border-right: 2px solid #00ffff;
    border-bottom: 2px solid #00ffff;
    transform: translateY(-50%) rotate(45deg);
    pointer-events: none;
    z-index: 3;
}

/* 悬停效果 */
.difficulty_select_7ree:hover + .difficulty_selector_7ree::after {
    background-color: #00667a;
    border-color: #00ffff;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.4);
}

/* 获取焦点效果 */
.difficulty_select_7ree:focus + .difficulty_selector_7ree::after {
    border-color: #00ffff;
    box-shadow: 0 0 15px rgba(0, 255, 255, 0.5);
}

/* PC版卡片尺寸调整 */
@media (min-width: 768px) {
    .difficulty_selector_7ree label {
        font-size: 18px;
        margin-bottom: 10px;
    }
    
    .difficulty_select_7ree {
        height: 45px;
        max-width: 180px;
    }
    
    .difficulty_selector_7ree::after {
        font-size: 18px;
        height: 45px;
        width: 180px;
    }
    
    /* PC版箭头位置调整 */
    .difficulty_selector_7ree::before {
        right: calc(50% - 70px); /* PC版向左调整位置 */
        width: 10px;
        height: 10px;
    }
}

/* 难度显示样式 - PC版 */
.difficulty_display_pc {
    display: none;
}

/* 难度显示样式 - 移动版 */
.difficulty_display_mobile {
    display: none;
    position: absolute;
    top: 10px;
    right: 10px;
    color: #00ffff;
    font-size: 12px;
    background-color: rgba(0, 50, 75, 0.7);
    border-radius: 4px;
    padding: 2px 6px;
}

/* PC版显示难度 */
@media (min-width: 768px) {
    .difficulty_display_pc {
        display: block;
    }
}

/* 移动版显示难度 */
@media (max-width: 767px) {
    .difficulty_display_mobile {
        display: block;
    }
}

.welcome_btn_7ree {
    /* 继承自.card_btn_7ree */
}

/* 游戏结束卡片特殊样式 */
.gameover_card_7ree {
    /* 继承自.card_7ree */
    display: none; /* 默认隐藏 */
}

/* 游戏结束卡片标题颜色 - 使用绿色 */
.gameover_card_7ree .card_title_7ree {
    color: #00cc66;
    text-shadow: 0 0 10px rgba(0, 204, 102, 0.7);
}

/* 游戏结束卡片按钮颜色 */
.gameover_card_7ree .card_btn_7ree {
    color: #00cc66;
    background-color: #1a2a1f;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.3), inset 0 0 5px rgba(0, 204, 102, 0.2);
}

.gameover_card_7ree .card_btn_7ree:hover {
    background-color: #25352a;
    box-shadow: 0 0 15px rgba(0, 204, 102, 0.3);
}

/* 游戏结束卡片的统计数据颜色 */
.gameover_card_7ree .stat_value_7ree {
    color: #00cc66;
    text-shadow: 0 0 8px rgba(0, 204, 102, 0.5);
}

/* 游戏暂停卡片特殊样式 */
.pause_card_7ree {
    /* 继承自.card_7ree */
    display: none; /* 默认隐藏 */
    background-color: rgba(0, 0, 0, 0.75); /* 稍微透明一些，能看到背后的游戏 */
}

/* 游戏暂停卡片标题颜色 - 使用黄色 */
.pause_card_7ree .card_title_7ree {
    color: #ffcc00;
    text-shadow: 0 0 10px rgba(255, 204, 0, 0.7);
}

.pause_content_7ree {
    /* 继承自.card_content_7ree */
    background: linear-gradient(135deg, #0c276f 0%, #161a20 95%);
    box-shadow: 
        0 10px 30px rgba(0, 0, 0, 0.8),
        0 0 40px rgba(255, 204, 0, 0.2), 
        inset 0 0 15px rgba(255, 204, 0, 0.1);
}

.pause_message_7ree {
    font-size: 18px;
    margin: 15px 0;
    color: #ffeeaa;
    text-shadow: 0 0 8px rgba(255, 204, 0, 0.5);
}

.pause_btn_7ree {
    /* 继承自.card_btn_7ree */
    color: #ffcc00;
    background-color: #2a2310;
    box-shadow: 0 0 15px rgba(255, 204, 0, 0.3), inset 0 0 8px rgba(255, 204, 0, 0.2);
}

.pause_btn_7ree:hover {
    background-color: #3a3217;
    box-shadow: 0 0 20px rgba(255, 204, 0, 0.4);
}

.game_stats_7ree {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 20px;
    background-color: rgba(10, 20, 35, 0.6);
    border-radius: 8px;
    padding: 15px;
    box-shadow: 
        inset 0 0 10px rgba(0, 0, 0, 0.3),
        inset 0 0 5px rgba(0, 155, 155, 0.1);
}

.stat_item_7ree {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0, 200, 200, 0.2);
    padding-bottom: 8px;
}

.stat_label_7ree {
    color: #aaa;
    font-size: 16px;
}

.stat_value_7ree {
    color: #00ffff;
    font-size: 20px;
    font-weight: bold;
    text-shadow: 0 0 8px rgba(0, 255, 255, 0.5);
}

/* 隐藏卡片的通用类 */
.card_hidden {
    opacity: 0;
    pointer-events: none;
}

/* PC版卡片尺寸调整 */
@media (min-width: 768px) {
    .card_content_7ree {
        width: 450px;
        padding: 40px;
    }
    
    .card_title_7ree {
        font-size: 40px;
        margin-bottom: 15px;
    }
    
    .card_btn_7ree {
        padding: 15px 40px;
        font-size: 20px;
    }
    
    .difficulty_selector_7ree label {
        font-size: 18px;
        margin-bottom: 10px;
    }
    
    .difficulty_select_7ree {
        font-size: 18px;
        padding: 10px 15px;
        width: 150px;
        padding-right: 35px;
        background-size: 18px;
    }
    
    .pause_message_7ree {
        font-size: 22px;
        margin: 20px 0;
    }
    
    .game_stats_7ree {
        padding: 20px;
        margin-top: 25px;
    }
    
    .stat_label_7ree {
        font-size: 18px;
    }
    
    .stat_value_7ree {
        font-size: 24px;
    }
}