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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    line-height: 1.8;
    color: #333;
    background-color: #f5f5f5;
    padding: 0;
    margin: 0;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background-color: #fff;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    min-height: 100vh;
}

.lang-switch {
    display: flex;
    width: fit-content;
    margin: 0 0 16px auto;
    padding: 2px;
    background: #e8eaed;
    border: 1px solid #e0e0e0;
    border-radius: 999px;
}

.lang-switch a {
    padding: 4px 12px;
    font-size: 12px;
    font-weight: 500;
    line-height: 1.3;
    color: #747478;
    text-decoration: none;
    border-radius: 999px;
}

.lang-switch a.is-active {
    background: #fff;
    color: #1a1a1a;
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
    pointer-events: none;
}

.lang-switch a:hover:not(.is-active) {
    color: #1a1a1a;
}

h1 {
    font-size: 24px;
    font-weight: 600;
    color: #1a1a1a;
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 2px solid #e8e8e8;
}

h2 {
    font-size: 18px;
    font-weight: 600;
    color: #1a1a1a;
    margin-top: 30px;
    margin-bottom: 15px;
}

h3 {
    font-size: 16px;
    font-weight: 600;
    color: #333;
    margin-top: 20px;
    margin-bottom: 10px;
}

h4 {
    font-size: 14px;
    font-weight: 600;
    color: #333;
    margin-top: 16px;
    margin-bottom: 8px;
}

p {
    font-size: 14px;
    margin-bottom: 12px;
    text-align: justify;
}

.intro {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 25px;
    border-left: 4px solid #28a745;
}

.highlight {
    background-color: #fff3cd;
    padding: 15px;
    border-radius: 6px;
    margin: 15px 0;
    border-left: 4px solid #ffc107;
}

.important {
    font-weight: 600;
    color: #d9534f;
}

.info-box {
    background-color: #e7f3ff;
    padding: 15px;
    border-radius: 6px;
    margin: 15px 0;
    border-left: 4px solid #007bff;
}

ul {
    margin: 10px 0 15px 20px;
}

li {
    font-size: 14px;
    margin-bottom: 8px;
    list-style-type: none;
    position: relative;
    padding-left: 20px;
}

li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: #28a745;
    font-weight: bold;
}

ul ul {
    margin-top: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
    font-size: 14px;
}

th, td {
    border: 1px solid #ddd;
    padding: 12px;
    text-align: left;
}

th {
    background-color: #f8f9fa;
    font-weight: 600;
    color: #333;
}

.footer {
    text-align: center;
    margin-top: 50px;
    padding-top: 30px;
    border-top: 1px solid #e8e8e8;
    color: #666;
    font-size: 14px;
}

.footer p {
    margin: 8px 0;
    text-align: center;
}

.section-number {
    color: #28a745;
    font-weight: 600;
}

.contact-info {
    background-color: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

@media (max-width: 768px) {
    .container {
        padding: 20px 15px;
    }

    h1 {
        font-size: 20px;
    }

    h2 {
        font-size: 16px;
    }

    h3 {
        font-size: 15px;
    }

    p, li, th, td {
        font-size: 13px;
    }

    table {
        font-size: 12px;
    }

    th, td {
        padding: 8px;
    }
}