/* 移动端优化 - 基础设置 */
* {
    box-sizing: border-box;
}

/* 性能优化 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

a, button {
    -webkit-tap-highlight-color: rgba(0, 123, 255, 0.3);
    tap-highlight-color: rgba(0, 123, 255, 0.3);
}

body {
    /* 创建一个角度倾斜的七彩渐变背景，每种颜色加 50% 透明度 */
    background: linear-gradient(45deg, 
                                rgba(255, 0, 0, 0.5), /* red */
                                rgba(255, 165, 0, 0.5), /* orange */
                                rgba(255, 255, 0, 0.5), /* yellow */
                                rgba(0, 128, 0, 0.5), /* green */
                                rgba(0, 0, 255, 0.5), /* blue */
                                rgba(75, 0, 130, 0.5), /* indigo */
                                rgba(238, 130, 238, 0.5)); /* violet */
    background-attachment: fixed;
    background-size: cover;
    overflow-x: hidden; /* 防止横向滚动 */
    -webkit-text-size-adjust: 100%; /* 防止iOS字体自动调整 */
    -webkit-overflow-scrolling: touch; /* iOS 平滑滚动 */
}

.sticky-top {
    position: sticky;
    top: 0;
    z-index: 1000;  /* 确保它在页面的最顶层 */
    width: 100%; /* 确保它宽度与容器一致 */
}

.card-container {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    justify-content: center;
}

/* 设置图片容器为 Flexbox，使内容垂直和水平居中 */
.col-md-4 {
    display: flex;
    align-items: center; /* 垂直居中 */
    justify-content: center; /* 水平居中 */
    padding: 2px; /* 维持间隙 */
}

.card-img {
    display: block; /* 设置图片为块级元素 */
    margin: auto; /* 水平居中图片 */
    padding: 2px; /* 在图片周围添加10px的间隙 */
    max-width: 100%; /* 确保图片不会超出容器宽度 */
    height: auto; /* 保持图片原有比例 */
    object-fit: contain; /* 保持图片比例 */
}

.card {
    width: 100%;
    max-width: 540px;
    margin: 0 auto;
}

.bold-border {
    border: 2px solid #000000; /* 设置边框为2px粗且颜色为黑色 */
    overflow: hidden; /* 防止内容溢出 */
}

.button-link {
    background: none;            /* 无背景 */
    color: blue;                 /* 链接蓝色 */
    border: none;                /* 无边框 */
    padding: 0;                  /* 无内边距 */
    margin: 0;                   /* 根据需要调整外边距 */
    font: inherit;               /* 继承字体样式 */
    cursor: pointer;             /* 手型光标 */
    text-decoration: underline;  /* 下划线，模仿链接 */
    min-height: 44px;            /* 移动端最小触摸区域 */
    min-width: 44px;             /* 移动端最小触摸区域 */
    display: inline-flex;        /* Flexbox 布局 */
    align-items: center;         /* 垂直居中 */
    justify-content: center;     /* 水平居中 */
}

.button-link:hover,
.button-link:focus {
    text-decoration: none;       /* 鼠标悬停和聚焦时无下划线 */
    color: darkblue;             /* 悬停时颜色加深 */
}

/* Badge 徽章样式优化 */
.list-group-item-warning {
    white-space: nowrap;         /* 防止换行 */
    overflow-x: auto;            /* 允许横向滚动 */
    overflow-y: hidden;          /* 隐藏纵向滚动 */
    -webkit-overflow-scrolling: touch; /* iOS 平滑滚动 */
    scrollbar-width: thin;       /* Firefox 细滚动条 */
    scrollbar-color: rgba(0, 123, 255, 0.3) transparent; /* 滚动条颜色 */
}

/* Webkit 浏览器滚动条样式 */
.list-group-item-warning::-webkit-scrollbar {
    height: 4px;                 /* 滚动条高度 */
}

.list-group-item-warning::-webkit-scrollbar-track {
    background: transparent;     /* 滚动条轨道背景 */
}

.list-group-item-warning::-webkit-scrollbar-thumb {
    background: rgba(0, 123, 255, 0.3); /* 滚动条滑块颜色 */
    border-radius: 2px;          /* 圆角 */
}

.list-group-item-warning::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 123, 255, 0.5); /* 悬停时颜色 */
}

.list-group-item-warning img {
    display: inline-block;       /* 内联块元素 */
    vertical-align: middle;      /* 垂直居中 */
    margin: 2px 3px;             /* 徽章之间的间距 */
    max-width: none;             /* 不限制宽度 */
    height: 20px;                /* 固定高度 */
    width: auto;                 /* 宽度自适应 */
    flex-shrink: 0;              /* 不允许收缩 */
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .button-link {
        padding: 8px 12px;
    }
    
    .nav-link-item {
        padding: 12px 16px;
        min-height: 48px;
    }
    
    .back-to-top {
        width: 50px;
        height: 50px;
    }
}


.header-container {
    display: flex;
    align-items: center;
    flex-wrap: wrap; /* 允许换行 */
    gap: 10px;
}
.header-title {
    margin-bottom: 0;
    flex-grow: 1;
    display: flex;
    align-items: center;
    gap: 5px;
}
.header-title img {
    height: 60px;
    width: auto;
    max-width: 100%;
}
.header-free {
    display: inline-block;
    font-size: clamp(38px, 8vw, 72px);
    font-weight: 900;
    color: #fff;
    background: linear-gradient(135deg, #2ecc40, #0b8a2e);
    padding: 6px 26px;
    border-radius: 16px;
    border: 4px solid #fff;
    box-shadow: 0 4px 12px rgba(0,0,0,0.35);
    transform: rotate(-6deg);
    line-height: 1.15;
    text-shadow: 2px 2px 3px rgba(0,0,0,0.35);
    white-space: nowrap;
    margin-left: 10px;
}
.header-explanation {
    padding: 10px;
    margin-left: 20px;
    background-image: linear-gradient(to right, #ffd700, #b8860b);
    border: 3px solid hsl(210.8, 73.86%, 30%);
    border-radius: 5px;
    white-space: nowrap;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
    line-height: 1.4;
}


.tooltip-inner {
    text-align: left; /* 设置文本为左对齐 */
    font-size: 11px; /* 设置字号为 11px，大约等于 8 号字体 */
}

/* 回到顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 80px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: rgba(0, 123, 255, 0.8);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 999;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background-color: rgba(0, 86, 179, 0.9);
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.4);
}

/* 快速导航 */
.quick-nav {
    position: fixed;
    top: 50%;
    right: 30px;
    transform: translateY(-50%);
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    padding: 15px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    min-width: 150px;
    z-index: 998;
}

.quick-nav-title {
    font-weight: bold;
    font-size: 16px;
    color: #333;
    margin-bottom: 10px;
    text-align: center;
    border-bottom: 2px solid #007bff;
    padding-bottom: 8px;
}

.nav-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.nav-link-item {
    padding: 8px 12px;
    background-color: #f8f9fa;
    border-left: 3px solid #007bff;
    color: #333;
    text-decoration: none;
    border-radius: 3px;
    transition: all 0.3s ease;
    font-size: 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-link-item:hover {
    background-color: #007bff;
    color: white;
    transform: translateX(-3px);
    box-shadow: 0 2px 6px rgba(0, 123, 255, 0.3);
}

.nav-count-badge {
    background-color: #28a745;
    color: white;
    font-size: 11px;
    padding: 2px 6px;
    border-radius: 10px;
    font-weight: bold;
    margin-left: 8px;
    min-width: 30px;
    text-align: center;
}

.nav-link-item:hover .nav-count-badge {
    background-color: rgba(255, 255, 255, 0.3);
    color: white;
}

/* 导航链接激活状态 */
.nav-link-item.active {
    background-color: rgba(33, 150, 243, 0.3);
    border-left: 4px solid #2196F3;
    font-weight: bold;
}

.nav-link-item.active .nav-count-badge {
    background-color: #2196F3;
    color: white;
}

/* 分页导航栏样式 */
.section-navigation-bar {
    position: sticky;
    top: 0;
    z-index: 999;
    margin-bottom: 20px;
    animation: slideDown 0.3s ease-out;
}

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

/* 导航按钮样式 */
.section-navigation-bar button {
    transition: all 0.3s ease;
}

.section-navigation-bar button:hover:not(:disabled) {
    background: linear-gradient(135deg, #f4e5a1, #d4af37, #f4e5a1) !important;
    border-color: #f4e5a1 !important;
    transform: scale(1.08);
    box-shadow: 0 4px 15px rgba(244, 229, 161, 0.6);
}

.section-navigation-bar button:active:not(:disabled) {
    transform: scale(1.02);
    box-shadow: 0 2px 8px rgba(212, 175, 55, 0.4);
}

.section-navigation-bar button:disabled {
    opacity: 0.4 !important;
    cursor: not-allowed;
    background: linear-gradient(135deg, #666, #555, #666) !important;
    border-color: #555 !important;
    filter: grayscale(100%);
}

/* Section 切换动画 */
.section-content-fade-in {
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 响应式设计 - 移动端优化 */
@media (max-width: 768px) {
    /* 隐藏快速导航 */
    .quick-nav {
        display: none;
    }
    
    /* 优化回到顶部按钮 */
    .back-to-top {
        right: 15px;
        bottom: 15px;
        width: 45px;
        height: 45px;
        font-size: 18px;
    }
    
    /* 优化分页导航栏 */
    .section-navigation-bar {
        font-size: 12px;
        padding: 8px 5px !important;
    }
    
    .section-navigation-bar button {
        font-size: 11px;
        padding: 4px 8px;
        min-width: 70px !important;
    }
    
    .section-navigation-bar .btn-group {
        flex-wrap: wrap;
        gap: 5px;
    }
    
    /* 优化头部 */
    .header-container {
        flex-direction: column;
        align-items: flex-start;
        gap: 10px;
    }
    
    .header-title img {
        height: 40px !important;
    }
    
    .header-explanation {
        margin-left: 0;
        white-space: normal;
        width: 100%;
        text-align: center;
        font-size: 12px;
        padding: 8px;
    }
    
    /* 优化卡片布局 */
    .card {
        margin-bottom: 15px !important;
    }
    
    .card-body {
        padding: 10px !important;
    }
    
    .card-title {
        font-size: 18px !important;
    }
    
    .list-group-item {
        font-size: 12px;
        padding: 8px 10px;
    }
    
    /* 优化卡片图片布局 */
    .card .row.g-0 {
        flex-direction: column !important;
    }
    
    .card .col-md-4,
    .card .col-md-8 {
        max-width: 100% !important;
        width: 100% !important;
    }
    
    .card-img {
        max-width: 200px;
        margin: 10px auto;
    }
    
    /* 优化徽章 - 保持水平排列 */
    .list-group-item-warning {
        white-space: nowrap !important;
        overflow-x: auto !important;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: thin;
    }
    
    .list-group-item-warning img {
        height: 18px !important;
        width: auto !important;
        max-width: none !important;
        min-width: auto !important;
        flex-shrink: 0;
    }
    
    /* 优化按钮 */
    .button-link {
        font-size: 12px;
    }
    .container {
        padding-left: 10px;
        padding-right: 10px;
    }
    
    /* 优化模态框 */
    .modal-dialog {
        margin: 10px;
    }
    
    .modal-body img {
        width: 30% !important;
    }
    
    .modal-title {
        font-size: 16px;
    }
    
    .modal-footer button {
        font-size: 13px;
        padding: 6px 12px;
    }
    
    /* 优化标题 */
    h4 {
        font-size: 18px !important;
        padding: 8px 0;
    }
    
    /* 优化 tooltip */
    .tooltip-inner {
        font-size: 10px;
        max-width: 200px;
    }
}

/* 平板设备优化 (768px - 1024px) */
@media (min-width: 768px) and (max-width: 1024px) {
    .quick-nav {
        right: 15px;
        min-width: 120px;
        padding: 10px;
    }
    
    .quick-nav-title {
        font-size: 14px;
    }
    
    .nav-link-item {
        font-size: 12px;
        padding: 6px 10px;
    }
    
    .header-title img {
        height: 50px !important;
    }
    
    .header-explanation {
        font-size: 13px;
        padding: 8px;
    }
    
    .card-title {
        font-size: 20px !important;
    }
    
    .list-group-item {
        font-size: 13px;
    }
}

/* 小屏手机优化 (最大 576px) */
@media (max-width: 576px) {
    .header-title img {
        height: 35px !important;
    }
    
    .card-title {
        font-size: 16px !important;
    }
    
    .list-group-item {
        font-size: 11px;
        padding: 6px 8px;
    }
    
    /* 小屏手机徽章优化 */
    .list-group-item-warning img {
        height: 16px !important;
        margin: 1px 2px;
    }
    
    .card-footer small {
        font-size: 10px;
    }
    
    .section-navigation-bar button {
        font-size: 10px;
        padding: 3px 6px;
        min-width: 60px !important;
    }
    
    .back-to-top {
        width: 40px;
        height: 40px;
        font-size: 16px;
        right: 10px;
        bottom: 10px;
    }
    
    h4 {
        font-size: 16px !important;
    }
}

/* 横屏模式优化 */
@media (max-width: 768px) and (orientation: landscape) {
    .header-container {
        flex-direction: row;
    }
    
    .header-explanation {
        width: auto;
        font-size: 11px;
    }
    
    .card .row.g-0 {
        flex-direction: row !important;
    }
    
    .card .col-md-4 {
        max-width: 40% !important;
        width: 40% !important;
    }
    
    .card .col-md-8 {
        max-width: 60% !important;
        width: 60% !important;
    }
}