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

/* 基础样式 */
body {
    margin: 0;
    padding: 0;
    background-color: #f5f7fa;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* 头部样式 */
.header {
    background: #4a90e2;
    padding: 15px 0;
    margin-bottom: 30px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo {
    color: white;
    font-size: 24px;
    font-weight: bold;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 20px;
}

.nav-link {
    color: white;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 4px;
    transition: background-color 0.3s ease;
}

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

/* 用户菜单样式 */
.user-menu {
    position: relative;
}

.user-menu-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    color: white;
    text-decoration: none;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.user-menu-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.user-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    min-width: 150px;
    display: none;
}

.user-menu:hover .user-menu-dropdown {
    display: block;
}

.user-menu-item {
    display: block;
    padding: 10px 15px;
    color: #333;
    text-decoration: none;
    transition: background-color 0.3s ease;
}

.user-menu-item:hover {
    background-color: #f5f7fa;
}

.user-menu-item i {
    margin-right: 8px;
    width: 16px;
    text-align: center;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    text-decoration: none;
}

.btn-primary {
    background: #4a90e2;
    color: white;
}

.btn-primary:hover {
    background: #357abd;
}

.btn-secondary {
    background: #f5f7fa;
    color: #666;
}

.btn-secondary:hover {
    background: #e6e9ed;
}



.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 0.8rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-brand {
    color: white;
    font-size: 1.2rem;
    font-weight: bold;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.nav-brand i {
    font-size: 1.4rem;
}

.login-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    padding: 0.4rem 1.2rem;
    color: white;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
}

.login-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}