* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2c5282;
    --secondary-color: #4299e1;
    --accent-color: #ebf8ff;
    --text-color: #2d3748;
    --light-text: #718096;
    --border-color: #e2e8f0;
    --bg-color: #f7fafc;
    --white: #ffffff;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

body {
    font-family: "Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", sans-serif;
    line-height: 1.7;
    color: var(--text-color);
    background-color: var(--bg-color);
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 35px;
    border-radius: 12px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
}

.header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
    position: relative;
}

.header::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -2px;
    width: 100px;
    height: 2px;
    background-color: var(--primary-color);
    transform: translateX(-50%);
}

.header h1 {
    color: var(--primary-color);
    font-size: 26px;
    margin-bottom: 12px;
    font-weight: bold;
}

.date-info {
    color: var(--light-text);
    font-size: 14px;
    margin-bottom: 5px;
}

.toc {
    background-color: var(--accent-color);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border-left: 4px solid var(--primary-color);
}

.toc-title {
    font-weight: bold;
    margin-bottom: 12px;
    color: var(--primary-color);
    font-size: 16px;
}

.toc-list {
    list-style-type: none;
}

.toc-list li {
    margin-bottom: 8px;
    padding-left: 10px;
    position: relative;
}

.toc-list li::before {
    content: "•";
    color: var(--secondary-color);
    position: absolute;
    left: 0;
}

.toc-list a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.3s;
    font-size: 15px;
}

.toc-list a:hover {
    color: var(--secondary-color);
    padding-left: 3px;
}

.section {
    margin-bottom: 30px;
    padding-bottom: 5px;
}

.section h2 {
    font-size: 20px;
    color: var(--primary-color);
    margin-bottom: 18px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.section h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 60px;
    height: 1px;
    background-color: var(--primary-color);
}

.section h3 {
    font-size: 18px;
    margin: 18px 0 12px;
    color: var(--secondary-color);
}

p {
    margin-bottom: 15px;
    line-height: 1.8;
    text-align: justify;
}

ul {
    padding-left: 20px;
    margin-bottom: 15px;
}

ul li {
    margin-bottom: 8px;
    position: relative;
    padding-left: 5px;
}

.buttons {
    text-align: center;
    margin-top: 35px;
}

.btn {
    display: inline-block;
    padding: 10px 25px;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 6px;
    margin: 0 10px;
    transition: all 0.3s;
    font-weight: 500;
    border: 1px solid var(--primary-color);
    box-shadow: 0 2px 4px rgba(44, 82, 130, 0.2);
}

.btn:hover {
    background-color: var(--white);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(44, 82, 130, 0.3);
}

#back-to-top {
    position: fixed;
    bottom: 25px;
    right: 25px;
    background-color: var(--primary-color);
    color: white;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    text-align: center;
    line-height: 45px;
    cursor: pointer;
    display: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    z-index: 1000;
    font-size: 18px;
    transition: all 0.3s;
}

#back-to-top:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.home-container {
    text-align: center;
    padding: 40px 20px;
    background-image: linear-gradient(135deg, rgba(44, 82, 130, 0.03) 0%, rgba(66, 153, 225, 0.06) 100%);
    border-radius: 12px;
}

.home-title {
    font-size: 30px;
    margin-bottom: 15px;
    color: var(--primary-color);
    font-weight: bold;
    position: relative;
    display: inline-block;
    padding-bottom: 10px;
}

.home-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: 0;
    width: 80px;
    height: 2px;
    background-color: var(--primary-color);
    transform: translateX(-50%);
}

.home-container h2 {
    color: var(--light-text);
    margin-bottom: 30px;
    font-size: 18px;
    font-weight: normal;
}

.company-info {
    margin-top: 60px;
    color: var(--light-text);
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.company-logo {
    max-width: 150px;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .container {
        padding: 25px 20px;
    }
    
    .header h1 {
        font-size: 22px;
    }
    
    .section h2 {
        font-size: 18px;
    }
    
    .btn {
        padding: 8px 15px;
        font-size: 14px;
    }
    
    .home-title {
        font-size: 24px;
    }
}