/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 头部样式 */
header {
    background-color: #343a40;
    color: white;
    padding: 1rem 0;
    margin-bottom: 2rem;
}

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

header h1 {
    font-size: 1.8rem;
}

nav a {
    color: white;
    text-decoration: none;
    margin-left: 1.5rem;
}

nav a:hover {
    text-decoration: underline;
}

/* 主内容区 */
.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem 0;
}

.hero h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero p {
    font-size: 1.2rem;
    color: #6c757d;
}

/* 分类区域 */
.category-section {
    margin-bottom: 3rem;
}

.category-section h2 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    color: #495057;
}

.category-description {
    color: #6c757d;
    margin-bottom: 1.5rem;
}

/* 工具网格 */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.tool-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.tool-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.tool-card h3 {
    margin-bottom: 0.5rem;
    color: #495057;
}

.tool-card p {
    color: #6c757d;
    margin-bottom: 1rem;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    background-color: #007bff;
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn:hover {
    background-color: #0056b3;
    text-decoration: none;
}

/* 页脚样式 */
footer {
    background-color: #343a40;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
}

/* 登录页面样式 */
.login-container {
    max-width: 400px;
    margin: 5rem auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.login-container h1 {
    text-align: center;
    margin-bottom: 1.5rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ced4da;
    border-radius: 4px;
    font-size: 1rem;
}

.error-message {
    color: #dc3545;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background-color: #f8d7da;
    border: 1px solid #f5c6cb;
    border-radius: 4px;
}

.message {
    color: #155724;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background-color: #d4edda;
    border: 1px solid #c3e6cb;
    border-radius: 4px;
}

/* 后台管理样式 */
.admin-container {
    display: flex;
    min-height: calc(100vh - 150px);
}

.admin-sidebar {
    width: 250px;
    background: #343a40;
    color: white;
    padding: 1.5rem 0;
}

.admin-sidebar h3 {
    padding: 0 1.5rem;
    margin-bottom: 1rem;
}

.admin-sidebar ul {
    list-style: none;
}

.admin-sidebar li a {
    display: block;
    padding: 0.75rem 1.5rem;
    color: #ced4da;
    text-decoration: none;
}

.admin-sidebar li a:hover,
.admin-sidebar li a.active {
    background-color: #495057;
    color: white;
}

.admin-main {
    flex: 1;
    padding: 2rem;
    background: #f8f9fa;
}

/* 统计卡片 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    text-align: center;
}

.stat-card h3 {
    color: #6c757d;
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: #007bff;
    margin-bottom: 0.5rem;
}

/* 表格样式 */
table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #dee2e6;
}

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

tr:hover {
    background-color: #f8f9fa;
}

/* 管理表单 */
.admin-form {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 2rem;
}

.admin-list {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

/* 工具容器 */
.tool-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .admin-container {
        flex-direction: column;
    }
    
    .admin-sidebar {
        width: 100%;
    }
    
    .tools-grid {
        grid-template-columns: 1fr;
    }
    
    header .container {
        flex-direction: column;
        text-align: center;
    }
    
    nav {
        margin-top: 1rem;
    }
    
    nav a {
        margin: 0 0.5rem;
    }
}
/* 密码强度指示器 */
.password-strength {
    margin-top: 5px;
    height: 5px;
    background: #eee;
    border-radius: 3px;
    overflow: hidden;
}

.password-strength-bar {
    height: 100%;
    width: 0%;
    transition: width 0.3s ease;
}

.strength-weak { background: #dc3545; }
.strength-medium { background: #ffc107; }
.strength-strong { background: #28a745; }

.password-requirements {
    margin-top: 10px;
    font-size: 0.9em;
    color: #6c757d;
}

.password-info {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f8f9fa;
    border-radius: 4px;
    border-left: 4px solid #007bff;
}

.warning-message {
    background-color: #fff3cd;
    color: #856404;
    padding: 1rem;
    border: 1px solid #ffeaa7;
    border-radius: 4px;
    margin-bottom: 1.5rem;
}

.warning-message a {
    color: #856404;
    text-decoration: underline;
}