/* 全局基础样式 */
html {
    box-sizing: border-box;
    font-size: 16px;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

*,
*::before,
*::after {
    box-sizing: inherit;
    margin: 0;
    padding: 0;
}

body {
    max-width: 1000px;
    margin: 0 auto;
    padding: 1rem;
    font-family: sans-serif;
    background-color: #fff;
    /* 纯白背景 */
    color: #000;
    /* 黑色文字 */
}

/* 章节标签 */
header,
nav,
section,
article,
aside,
footer,
main {
    margin: 1.5rem 0;
    padding: 20px;
    background-color: #fff;
    border: 1px solid #000;
    /* 黑色边框 */
    border-radius: 0;
    box-shadow: 5px 5px 0 #000;
}

/* 标题标签 */
h1,
h2,
h3,
h4,
h5,
h6 {
    margin: 0.5rem 0;
    line-height: 1.2;
    color: #000;
    /* 黑色标题 */
}

h1 {
    font-size: 2rem;
}

h2 {
    font-size: 1.75rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.1rem;
}

h6 {
    font-size: 1rem;
}

/* 文本内容标签 */
p {
    margin-bottom: 1rem;
}

pre,
code {
    font-family: monospace;
    background-color: #f4f4f4;
    padding: 0.5rem;
    overflow-x: auto;
}

blockquote {
    margin: 1rem 0;
    padding: 0.5rem 1rem;
    background-color: #fff;
    border-left: 4px solid #000;
}

hr {
    border: none;
    border-top: 1px solid #000;
    margin: 2rem 0;
}

/* 列表标签 */
ul,
ol,
dl {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

li {
    margin-bottom: 0.5rem;
}

dt {
    font-weight: bold;
}

dd {
    margin-bottom: 0.5rem;
}

/* 图片和多媒体 */
img,
video,
iframe,
embed,
object {
    max-width: 100%;
    height: auto;
    display: block;
    margin: 1rem 0;
}

/* 行内文本标签 */
a {
    color: #000;
    /* 链接颜色为黑色 */
    text-decoration: none;
    /* 去除默认下划线 */
    margin: 0 0.3rem;
    /* 调整为较小间距 */
}

a:hover {
    /* 去除下划线效果 */
    text-decoration: none;
    /* 鼠标悬浮时不显示下划线 */
}

strong,
b {
    font-weight: bold;
}

em,
i {
    font-style: italic;
}

/* 表格 */
table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
    overflow-x: auto;
}

th,
td {
    padding: 0.5rem;
    border: 1px solid #000;
    text-align: left;
}

caption {
    text-align: left;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

/* 表单 */
form {
    margin-bottom: 1.5rem;
}

input,
textarea,
select,
button {
    display: block;
    width: 100%;
    padding: 0.5rem;
    margin-bottom: 1rem;
    font-size: 1rem;
    min-width: 120px;
}

button {
    cursor: pointer;
    background-color: #000;
    color: #fff;
    border: none;
    box-shadow: 2px 2px 0 #000;
}

/* 导航样式 */
nav {
    display: flex;
    align-items: center;
    justify-content: center;
    justify-content: center;
    justify-items: center;
}

nav a {
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: #000;
    border: 1px solid #000;
    border-radius: 0;
}

nav a:hover {
    background-color: #000;
    color: #fff;
    text-decoration: none;
    /* 去除悬停时的下划线 */
}


/* 响应式调整 */
@media (max-width: 600px) {
    body {
        padding: 0.5rem;
    }

    header,
    nav,
    section,
    article,
    aside,
    footer,
    main {
        padding: 10px;
    }

    h1 {
        font-size: 1.75rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    h4,
    h5,
    h6 {
        font-size: 1rem;
    }


    a {
        margin: 0.3rem 0;
        /* 手机模式下减少链接间距 */
    }

    button {
        padding: 0.75rem;
    }

    table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }

    input,
    textarea,
    select {
        font-size: 1.2rem;
    }
}



/* 弹窗气泡样式开始 */
.popup-bubble {
    position: fixed;
    padding: 8px 14px;
    border-radius: 6px;
    background-color: #333;
    color: white;
    font-family: Arial, sans-serif;
    font-size: 12px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
    z-index: 9999;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
    pointer-events: auto;
    /* 顶部居中显示 */
    top: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
}

/* 气泡出现的动画 */
.popup-bubble.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* 不同类型的气泡样式 */
.popup-bubble.success {
    background-color: #4CAF50;
}

.popup-bubble.error {
    background-color: #f44336;
}

.popup-bubble.warning {
    background-color: #ff9800;
}

.popup-bubble.info {
    background-color: #2196F3;
}

/* 关闭按钮样式 */
.popup-bubble .close-btn {
    position: relative;
    display: inline-block;
    vertical-align: middle;
    margin-left: 8px;
    color: rgba(255, 255, 255, 0.8);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 14px;
    width: 16px;
    height: 16px;
    padding: 0;
    line-height: 1;
    transition: background-color 0.2s;
    border-radius: 50%;
    min-width: 0 !important;
  margin-bottom: 0 !important;
}

.popup-bubble .close-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

/* 弹窗气泡样式结束 */



/* 响应式设计 */
@media (max-width: 768px) {}

@media (max-width: 576px) {}

@media (max-width: 480px) {}