:root {
            --primary: #1a73e8;
            --primary-dark: #1557b0;
            --bg: #ffffff;
            --text: #333333;
            --text-light: #666666;
            --border: #e8e8e8;
            --shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --radius: 10px;
            --nav-height: 68px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            background: #f5f6f8;
            color: var(--text);
            line-height: 1.6;
            min-height: 200vh;
            /* 让页面可滚动，方便测试 */;
        }

        /* ==================== 导航栏主容器 ==================== */
        .navbar {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg);
            box-shadow: var(--shadow);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            padding: 0 40px;
            transition: box-shadow var(--transition);
        }

        .navbar.scrolled {
            box-shadow: var(--shadow-lg);
        }

        #navbar a{
            text-decoration: none;
            color: black;
        }
        /* ==================== Logo区域 ==================== */
        .navbar__logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
            color: var(--text);
            font-weight: 700;
            font-size: 1.35rem;
            letter-spacing: -0.3px;
            flex-shrink: 0;
            margin-right: auto;
            z-index: 1001;
            transition: opacity var(--transition);
        }

        .navbar__logo:hover {
            opacity: 0.85;
        }

        .navbar__logo-img {
            height: 40px;
            width: auto;
            display: block;
            object-fit: contain;
            transition: transform var(--transition);
        }

        .navbar__logo:hover .navbar__logo-img {
            transform: scale(1.03);
        }

        /* ==================== 桌面端菜单 ==================== */
        .navbar__menu {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 6px;
            margin: 0;
            padding: 0;
        }

        .navbar__item {
            position: relative;
        }

        .navbar__link {
            display: flex;
            align-items: center;
            gap: 6px;
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
            font-size: 0.95rem;
            padding: 10px 16px;
            border-radius: 8px;
            transition: all var(--transition);
            white-space: nowrap;
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }

        .navbar__link:hover {
            background: #f0f4ff;
            color: var(--primary);
        }

        .navbar__link--active {
            background: #e8f0fe;
            color: var(--primary);
            font-weight: 600;
        }

        /* 下拉箭头 */
        .navbar__arrow {
            display: inline-block;
            width: 16px;
            height: 16px;
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .navbar__arrow svg {
            width: 100%;
            height: 100%;
            stroke: currentColor;
            fill: none;
            stroke-width: 2;
            stroke-linecap: round;
            stroke-linejoin: round;
        }

        .navbar__item--dropdown:hover .navbar__arrow {
            transform: rotate(180deg);
        }

        /* ==================== 下拉子菜单（桌面端） ==================== */
        .navbar__dropdown {
            position: absolute;
            top: calc(100% + 10px);
            left: 50%;
            transform: translateX(-50%) translateY(8px);
            background: #fff;
            border-radius: var(--radius);
            box-shadow: var(--shadow-lg);
            min-width: 200px;
            padding: 8px;
            list-style: none;
            opacity: 0;
            visibility: hidden;
            pointer-events: none;
            transition: all var(--transition);
            border: 1px solid var(--border);
        }

        .navbar__item--dropdown:hover .navbar__dropdown {
            opacity: 1;
            visibility: visible;
            pointer-events: auto;
            transform: translateX(-50%) translateY(0);
        }

        .navbar__dropdown::before {
            content: '';
            position: absolute;
            top: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 16px;
            height: 16px;
            background: #fff;
            border-left: 1px solid var(--border);
            border-top: 1px solid var(--border);
            rotate: 45deg;
            border-radius: 2px 0 0 0;
        }

        .navbar__dropdown-link {
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            color: var(--text);
            padding: 10px 14px;
            border-radius: 6px;
            font-size: 0.9rem;
            font-weight: 400;
            transition: all 0.2s;
            white-space: nowrap;
        }

        .navbar__dropdown-link:hover {
            background: #f5f7fa;
            color: var(--primary);
            padding-left: 18px;
        }

        .navbar__dropdown-link .dot {
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--primary);
            flex-shrink: 0;
            opacity: 0;
            transition: opacity 0.2s;
        }

        .navbar__dropdown-link:hover .dot {
            opacity: 1;
        }

        /* ==================== 右侧按钮（桌面端） ==================== */
        .navbar__actions {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-left: 24px;
            flex-shrink: 0;
        }

        .btn {
            padding: 10px 20px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
            font-family: inherit;
            white-space: nowrap;
            text-decoration: none;
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .btn--outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
        }

        .btn--outline:hover {
            background: #e8f0fe;
            border-color: var(--primary-dark);
            color: var(--primary-dark);
        }

        .btn--filled {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 115, 232, 0.35);
        }

        .btn--filled:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(26, 115, 232, 0.45);
            transform: translateY(-1px);
        }

        /* ==================== 汉堡按钮（移动端） ==================== */
        .navbar__toggle {
            display: none;
            /* 桌面端隐藏 */
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 42px;
            height: 42px;
            border-radius: 8px;
            border: none;
            background: transparent;
            cursor: pointer;
            z-index: 1001;
            gap: 6px;
            padding: 8px;
            transition: background var(--transition);
            flex-shrink: 0;
            margin-left: 16px;
        }

        .navbar__toggle:hover {
            background: #f0f4ff;
        }

        .navbar__toggle-line {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text);
            border-radius: 3px;
            transition: all var(--transition);
            transform-origin: center;
        }

        /* 汉堡按钮激活状态 → X形 */
        .navbar__toggle--active .navbar__toggle-line:nth-child(1) {
            transform: translateY(8.5px) rotate(45deg);
        }

        .navbar__toggle--active .navbar__toggle-line:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }

        .navbar__toggle--active .navbar__toggle-line:nth-child(3) {
            transform: translateY(-8.5px) rotate(-45deg);
        }

        /* ==================== 移动端遮罩层 ==================== */
        .navbar__overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            opacity: 0;
            transition: opacity var(--transition);
            pointer-events: none;
        }

        .navbar__overlay--visible {
            opacity: 1;
            pointer-events: auto;
        }

        /* ==================== 移动端侧边菜单 ==================== */
        .navbar__sidebar {
            display: none;
            /* 桌面端隐藏 */
            position: fixed;
            top: 0;
            right: -320px;
            width: 300px;
            max-width: 85vw;
            height: 100vh;
            height: 100dvh;
            background: #fff;
            z-index: 999;
            box-shadow: -4px 0 30px rgba(0, 0, 0, 0.15);
            transition: right var(--transition);
            overflow-y: auto;
            padding: 24px 20px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .navbar__sidebar--open {
            right: 0;
        }

        .navbar__sidebar-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
            margin-bottom: 8px;
        }

        .navbar__sidebar-logo {
            display: flex;
            align-items: center;
            text-decoration: none;
        }

        .navbar__sidebar-logo-img {
            height: 32px;
            width: auto;
            object-fit: contain;
        }

        .navbar__sidebar-close {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            border: none;
            background: #f5f5f5;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: #666;
            transition: all 0.2s;
        }

        .navbar__sidebar-close:hover {
            background: #e0e0e0;
            color: #333;
        }

        /* 移动端菜单项 */
        .navbar__sidebar-menu {
            list-style: none;
            padding: 0;
            margin: 0;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }

        .navbar__sidebar-link {
            display: flex;
            align-items: center;
            justify-content: space-between;
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
            font-size: 1rem;
            padding: 14px 16px;
            border-radius: 10px;
            transition: all 0.2s;
            cursor: pointer;
            border: none;
            background: none;
            width: 100%;
            text-align: left;
            font-family: inherit;
        }

        .navbar__sidebar-link:hover {
            background: #f5f7fa;
            color: var(--primary);
        }

        .navbar__sidebar-link--active {
            background: #e8f0fe;
            color: var(--primary);
            font-weight: 600;
        }

        /* 移动端子菜单 */
        .navbar__sidebar-submenu {
            list-style: none;
            padding: 0;
            margin: 0;
            overflow: hidden;
            max-height: 0;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            background: #f9fafb;
            border-radius: 10px;
            margin: 0 8px;
        }

        .navbar__sidebar-submenu--open {
            max-height: 300px;
        }

        .navbar__sidebar-sublink {
            display: block;
            text-decoration: none;
            color: var(--text-light);
            font-size: 0.9rem;
            padding: 11px 20px 11px 32px;
            transition: all 0.2s;
            border-radius: 6px;
            margin: 2px 6px;
        }

        .navbar__sidebar-sublink:hover {
            color: var(--primary);
            background: #eef3ff;
        }

        .navbar__sidebar-arrow {
            display: inline-block;
            transition: transform var(--transition);
            font-size: 0.7rem;
            color: #999;
        }

        .navbar__sidebar-link--expanded .navbar__sidebar-arrow {
            transform: rotate(180deg);
            color: var(--primary);
        }

        /* 移动端底部按钮 */
        .navbar__sidebar-actions {
            margin-top: auto;
            padding-top: 20px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .navbar__sidebar-actions .btn {
            width: 100%;
            justify-content: center;
            padding: 13px 20px;
            font-size: 0.95rem;
        }

        /* ==================== 响应式断点 ==================== */
        @media (max-width: 960px) {

            /* 隐藏桌面端菜单和操作按钮 */
            .navbar__menu,
            .navbar__actions {
                display: none;
            }

            /* 显示汉堡按钮 */
            .navbar__toggle {
                display: flex;
            }

            /* 显示侧边栏容器 */
            .navbar__sidebar {
                display: flex;
            }

            /* 显示遮罩层 */
            .navbar__overlay {
                display: block;
            }

            .navbar {
                padding: 0 20px;
            }
        }

        @media (max-width: 480px) {
            .navbar {
                padding: 0 14px;
                height: 60px;
            }

            :root {
                --nav-height: 60px;
            }

            .navbar__logo-img {
                height: 32px;
            }

            .navbar__sidebar {
                width: 280px;
                max-width: 88vw;
            }

            .navbar__sidebar-logo-img {
                height: 28px;
            }
        }

footer{
    background-color: #6b6b6b2e;
    height: 40px;
    text-align: center;
    font-size: small;
    padding: 10px 0 0 0;
    margin-top: 20px;
    border-top: #00000007 1px solid;
}



/* ==================== 用户菜单 ==================== */
.user-menu-container {
    display: inline-flex;
    align-items: center;
}

.user-menu {
    position: relative;
    display: inline-block;
    width: 100%;
}

.user-email {
    display: inline-flex;
    align-items: center;
    padding: 10px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: background var(--transition);
    border: 2px solid transparent;
    white-space: nowrap;
}

.user-email:hover {
    background: #f0f4ff;
    color: var(--primary);
    border-color: var(--primary);
}

.dropdown {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background: #fff;
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    min-width: 180px;
    padding: 6px 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all var(--transition);
    border: 1px solid var(--border);
    z-index: 100;
    text-align: center;
}

.dropdown.show {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
}

.dropdown a {
    display: block;
    padding: 10px 20px;
    color: var(--text);
    text-decoration: none;
    font-size: 0.9rem;
    transition: background 0.2s;
}

.dropdown a:hover {
    background: #f5f7fa;
    color: var(--primary);
}

/* 移动端侧边栏内用户菜单样式调整 */
.navbar__sidebar-actions .user-menu-container {
    display: block;
    width: 100%;
}

.navbar__sidebar-actions .user-email {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: 13px 20px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: #fff;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text);
    cursor: pointer;
    transition: all var(--transition);
    /* 关键：溢出省略 */
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
}

.navbar__sidebar-actions .user-email:hover {
    border-color: var(--primary);
    background: #f0f4ff;
}

/* 移动端下拉菜单：相对于邮箱按钮定位，宽度一致 */
.navbar__sidebar-actions .dropdown {
    position: absolute;
    right: auto;
    left: 0;
    width: 100%;
    min-width: unset;
    top: calc(100% + 4px);
}

/* 登录按钮样式（未登录时显示） */
.login-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--primary);
    background: transparent;
    border: 2px solid var(--primary);
    border-radius: 8px;
    text-decoration: none;
    transition: all var(--transition);
    white-space: nowrap;
}

.login-btn:hover {
    background: #e8f0fe;
    border-color: var(--primary-dark);
    color: var(--primary-dark);
}

/* 移动端侧边栏登录按钮全宽 */
.navbar__sidebar-actions .login-btn {
    width: 100% !important;  /* 如有必要，可加强权重 */
    justify-content: center;
    padding: 13px 20px;
    box-sizing: border-box;
}