/* 全局样式 */
:root {
    --primary-color: #1a73e8;
    --primary-dark: #0d47a1;
    --primary-light: #4285f4;
    --secondary-color: #5f6368;
    --light-color: #f8f9fa;
    --dark-color: #202124;
    --border-color: #dadce0;
    --hover-color: #174ea6;
    --box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
}

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

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', Arial, sans-serif;
    color: #333;
    background-color: #f8f9fa;
    line-height: 1.6;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: color 0.3s;
}

a:hover {
    color: var(--hover-color);
}

/* 头部样式 */
.header {
    background-color: #fff;
    box-shadow: var(--box-shadow);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    display: flex;
    align-items: center;
}

.logo i {
    margin-right: 8px;
    font-size: 28px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav li {
    margin-left: 20px;
}

.main-nav a {
    color: var(--dark-color);
    font-weight: 500;
    padding: 8px 12px;
    border-radius: var(--border-radius);
    transition: all 0.3s;
}

.main-nav a:hover,
.main-nav a.active {
    background-color: var(--primary-color);
    color: white;
}

.main-nav a i {
    margin-right: 5px;
}

/* 主内容区域 */
.main-content {
    padding: 40px 0;
    min-height: calc(100vh - 140px);
}

/* 工具卡片样式 */
.tool-card {
    background-color: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

.tool-card-header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px;
    font-weight: bold;
    font-size: 18px;
}

.tool-card-header.disabled {
    background-color: var(--secondary-color);
    opacity: 0.7;
    cursor: not-allowed;
}

.tool-card-link {
    display: block;
    color: white;
    text-decoration: none;
    width: 100%;
    height: 100%;
}

.tool-card-link:hover {
    color: white;
    text-decoration: none;
}

.tool-card-body {
    padding: 20px;
    flex-grow: 1;
}

.tool-card-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    text-align: right;
}

/* 按钮样式 */
.btn-tool {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: background-color 0.3s;
}

.btn-tool:hover {
    background-color: var(--hover-color);
    color: white;
}

.btn-back {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
    padding: 6px 12px;
    border-radius: var(--border-radius);
    display: inline-flex;
    align-items: center;
    transition: all 0.3s;
}

.btn-back i {
    margin-right: 5px;
}

.btn-back:hover {
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
}

/* 工具页面样式 */
.tool-page {
    background-color: #fff;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    padding: 25px;
    margin-bottom: 30px;
}

.tool-page-header {
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.tool-page-header h1 {
    font-size: 24px;
    color: var(--primary-color);
    margin-bottom: 10px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    font-weight: 500;
    margin-bottom: 8px;
    display: block;
    color: var(--dark-color);
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: border-color 0.3s;
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: none;
    box-shadow: 0 0 0 2px rgba(26, 115, 232, 0.2);
}

.form-text {
    color: var(--secondary-color);
    font-size: 0.875rem;
    margin-top: 5px;
}

/* 工具分类标签 */
.tool-categories {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 25px;
}

.category-tag {
    padding: 6px 12px;
    border-radius: 20px;
    background-color: #e8f0fe;
    color: var(--primary-color);
    cursor: pointer;
    transition: all 0.3s;
}

.category-tag:hover,
.category-tag.active {
    background-color: var(--primary-color);
    color: white;
}

/* 工具列表 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.tools-grid.left-aligned {
    grid-template-columns: repeat(4, minmax(220px, 1fr));
    justify-content: start;
}

.tools-grid.single-tool {
    grid-template-columns: minmax(300px, 500px);
    justify-content: center;
}

.tool-card.future-tool {
    opacity: 0.7;
}

/* 页脚样式 */
.footer {
    background-color: #fff;
    padding: 20px 0;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-links a {
    margin-left: 15px;
    color: var(--secondary-color);
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* 内容框样式 */
.content-box {
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 15px;
    margin-bottom: 20px;
    background-color: #fff;
}

.content-box.bg-light {
    background-color: #f8f9fa;
}

/* 选项组样式 */
.option-group {
    margin-top: 10px;
}

.option-item {
    margin-bottom: 10px;
}

.form-check-input:checked {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

/* 响应式调整 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
    }
    
    .logo {
        margin-bottom: 15px;
    }
    
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .main-nav li {
        margin: 5px;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .copyright {
        margin-bottom: 15px;
    }
    
    .footer-links a {
        margin: 0 8px;
    }
    
    .tools-grid, .tools-grid.left-aligned {
        grid-template-columns: 1fr;
    }
}