/* 共享样式文件 */
body {
    font-family: 'Segoe UI', Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
    color: #333;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

header {
    background-color: #4a76a8;
    color: white;
    padding: 15px 0 0 0;
    margin-bottom: 20px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    margin: 0;
    padding: 10px;
    font-weight: 500;
}

textarea {
    width: 100%;
    height: 150px;
    margin: 10px 0;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: monospace;
    font-size: 14px;
    resize: vertical;
    background-color: #fff;
}

table {
    width: 100%;
    margin: 20px 0;
    border-collapse: collapse;
    text-align: center;
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    border-radius: 4px;
    overflow: hidden;
}

th, td {
    border: 1px solid #e0e0e0;
    padding: 12px 8px;
}

th {
    background-color: #4a76a8;
    color: white;
    font-weight: 500;
}

tr:nth-child(even) {
    background-color: #f5f5f5;
}

.formula {
    margin: 20px 0;
    font-size: 16px;
    line-height: 1.6;
    text-align: left;
    background-color: #fff;
    padding: 20px;
    border-radius: 4px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.highlight {
    background-color: #f0f4f8;
    border: 1px solid #d0d9e6;
    border-radius: 4px;
    padding: 15px;
    font-family: monospace;
    display: block;
    text-align: center;
    margin: 15px 0;
}

.tableInput {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 4px;
    text-align: center;
    box-sizing: border-box;
}

button {
    background-color: #4a76a8;
    color: white;
    border: none;
    padding: 10px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #3a5a80;
}

section {
    margin-bottom: 30px;
}

.section-title {
    border-bottom: 2px solid #4a76a8;
    padding-bottom: 5px;
    margin-bottom: 15px;
    font-weight: 500;
    color: #4a76a8;
}

.params-table {
    width: 60%;
    margin: 20px auto;
}

/* 标签式导航菜单 */
.nav-tabs {
    display: flex;
    justify-content: center;
    padding: 0;
    margin: 0;
    list-style: none;
    background-color: #3a5a80;
    border-bottom: 3px solid #4a76a8;
}

.nav-tabs li {
    margin: 0;
}

.nav-tabs a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 12px 20px;
    transition: all 0.3s ease;
    position: relative;
    font-weight: 500;
}

.nav-tabs a:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.nav-tabs a.active {
    background-color: #4a76a8;
    color: white;
}

.nav-tabs a.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: white;
}

/* 数学公式样式 */
.math-formula {
    font-family: 'Times New Roman', Times, serif;
    font-size: 18px;
}

.math-sum {
    position: relative;
    display: inline-block;
    vertical-align: middle;
    text-align: center;
    padding: 0 5px;
}

.math-sum::before {
    content: '\2211';
    font-size: 24px;
}

.math-sum .math-limits {
    display: block;
    font-size: 12px;
    line-height: 12px;
    position: relative;
}

.math-sum .math-limits .math-from {
    position: absolute;
    right: 0;
    bottom: -10px;
}

.math-sum .math-limits .math-to {
    position: absolute;
    right: 0;
    top: -10px;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .params-table {
        width: 100%;
    }

    .formula {
        padding: 15px;
    }

    .nav-tabs {
        flex-wrap: wrap;
    }

    .nav-tabs a {
        padding: 10px 15px;
        font-size: 14px;
    }

    h1 {
        font-size: 24px;
    }
}