/* ==========================================================================
   统一导航组件样式 - 适配桌面端和移动端
   版本: 2.0
   更新时间: 2026-01-01
   ========================================================================== */

/* 顶部通栏 - 简洁设计 */
.top-bar {
    background: var(--bg-light, #f8fafc);
    padding: 6px 0;
    border-bottom: 1px solid var(--border-light, #e5e7eb);
    position: sticky;
    top: 0;
    z-index: 1001;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.top-bar .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    font-size: 11px;
    color: var(--neutral-color, #64748b);
}

.top-bar-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 2px 8px;
    transition: color 0.3s ease;
}

.top-bar-item:hover {
    color: var(--primary-color, #0ABAB5);
}

.top-bar-item i {
    color: var(--primary-color, #0ABAB5);
    font-size: 11px;
}

/* Header & Navigation - 简洁设计 */
.header {
    background: var(--bg-light, #f8fafc) !important;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    position: sticky;
    top: 30px;
    z-index: 1000;
    border-bottom: 1px solid var(--border-light, #e5e7eb);
    transition: all 0.3s ease;
    height: 65px;
    display: flex;
    align-items: center;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    height: 100%;
}

.logo-section {
    display: flex;
    flex-direction: column;
    position: relative;
}

/* Logo样式 */
.logo {
    font-size: 28px;
    font-weight: bold;
    color: var(--primary-color, #0ABAB5);
    text-decoration: none;
    letter-spacing: 1px;
    position: relative;
    display: inline-block;
    transition: color 0.3s ease;
}

.logo:hover {
    color: var(--primary-color, #0ABAB5);
    opacity: 0.8;
}

.logo-slogan {
    font-size: 12px;
    color: var(--neutral-color, #64748b);
    margin-top: 2px;
}

/* 导航菜单 - 简洁设计 */
.nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav a {
    color: var(--secondary-color, #1e293b) !important;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
    padding: 6px 12px;
    white-space: nowrap;
}

/* 导航项底部线 */
.nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-color, #0ABAB5);
    transition: width 0.3s ease;
}

.nav a:hover {
    color: var(--primary-color, #0ABAB5);
}

.nav a:hover::after {
    width: 80%;
}

.nav .dropdown {
    position: relative;
}

.nav .dropdown-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    padding: 6px 12px;
    transition: color 0.3s ease;
    color: var(--secondary-color, #1e293b) !important;
    font-size: 14px;
    white-space: nowrap;
}

.nav .dropdown-btn i {
    transition: transform 0.3s ease;
}

.nav .dropdown:hover .dropdown-btn {
    color: var(--primary-color, #0ABAB5);
}

.nav .dropdown:hover .dropdown-btn i {
    transform: rotate(180deg);
}

/* 下拉菜单 - 德勤风格科技感设计 */
.nav .dropdown-content {
    position: absolute;
    top: calc(100% + 20px); /* 从15px增加到20px，给更多空间 */
    left: 50%;
    transform: translateX(-50%);
    background: white;
    min-width: 800px;
    max-width: 1000px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
    border-radius: 12px;
    padding: 0;
    display: none;
    border: 1px solid #e2e8f0;
    opacity: 0;
    animation: fadeInDown 0.3s ease forwards;
    overflow: hidden;
    pointer-events: none;
}

/* 悬停时显示，添加延迟关闭 */
.nav .dropdown:hover .dropdown-content,
.nav .dropdown-content:hover {
    display: grid;
    grid-template-columns: 220px 1fr;
    pointer-events: auto;
}

/* 添加过渡延迟，防止鼠标移动时闪烁 */
.nav .dropdown {
    position: relative;
}

/* 上方安全区域 */
.nav .dropdown::before {
    content: '';
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 20px; /* 从15px增加到20px，扩大安全区域 */
    background: transparent;
}

/* 左右侧安全区域，防止鼠标从侧面移出 */
.nav .dropdown::after {
    content: '';
    position: absolute;
    top: 100%;
    left: -20px;
    right: -20px;
    height: calc(100vh - 100%);
    background: transparent;
    pointer-events: none;
    z-index: -1;
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

@keyframes fadeOutUp {
    from {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    to {
        opacity: 0;
        transform: translateX(-50%) translateY(-10px);
        display: none;
    }
}

/* 左侧分类导航 */
.dropdown-sidebar {
    background: linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
    padding: 20px 0;
    position: relative;
    border-right: 1px solid #e2e8f0;
}

.dropdown-category {
    padding: 12px 20px;
    color: #475569;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    border-left: 3px solid transparent;
    display: flex;
    align-items: center;
    gap: 10px;
}

.dropdown-category:hover,
.dropdown-category.active {
    background: rgba(10,186,181,0.08);
    color: #0ABAB5;
    border-left-color: #0ABAB5;
}

.dropdown-category i {
    font-size: 14px;
    min-width: 16px;
}

/* 右侧内容区域 */
.dropdown-main {
    padding: 30px 35px;
    background: linear-gradient(135deg, #fafbfc 0%, #f8fafc 50%, #fafbfc 100%);
    position: relative;
    max-height: 600px;
    overflow-y: auto;
}

/* 右侧背景装饰 */
.dropdown-main::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle at center, rgba(10,186,181,0.04) 0%, transparent 70%);
    pointer-events: none;
}

.dropdown-main::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 150px;
    height: 150px;
    background: radial-gradient(circle at center, rgba(59,130,246,0.03) 0%, transparent 70%);
    pointer-events: none;
}

/* 自定义滚动条 */
.dropdown-main::-webkit-scrollbar {
    width: 6px;
}

.dropdown-main::-webkit-scrollbar-track {
    background: #f1f5f9;
}

.dropdown-main::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
}

.dropdown-main::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

.dropdown-section {
    margin-bottom: 28px;
    position: relative;
}

.dropdown-section:last-child {
    margin-bottom: 0;
}

.dropdown-header {
    font-size: 10px;
    font-weight: 700;
    color: #64748b;
    text-transform: uppercase;
    letter-spacing: 1.2px;
    margin-bottom: 14px;
    padding: 8px 12px;
    border-bottom: none;
    position: relative;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(90deg, rgba(10,186,181,0.08) 0%, rgba(10,186,181,0.02) 100%);
    border-left: 3px solid #0ABAB5;
    border-radius: 0 6px 6px 0;
}

.dropdown-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
    gap: 4px;
}

.nav .dropdown-content a {
    display: flex;
    align-items: center;
    padding: 11px 16px;
    color: #1e293b;
    font-size: 14px;
    font-weight: 500;
    margin: 0;
    position: relative;
    border-radius: 8px;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
    text-decoration: none;
    line-height: 1.4;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
}

.nav .dropdown-content a::after {
    display: none;
}

.nav .dropdown-content a::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 0;
    background: linear-gradient(90deg, #0ABAB5 0%, rgba(10,186,181,0.3) 100%);
    transition: width 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 8px 0 0 8px;
}

.nav .dropdown-content a:hover {
    background: linear-gradient(90deg, rgba(10,186,181,0.06) 0%, rgba(10,186,181,0.02) 100%);
    color: #0ABAB5;
    padding-left: 20px;
    transform: translateX(2px);
}

.nav .dropdown-content a:hover::before {
    width: 3px;
}

.nav .dropdown-content a i {
    margin-right: 10px;
    font-size: 14px;
    color: #cbd5e1;
    transition: all 0.2s ease;
    min-width: 16px;
    text-align: center;
}

.nav .dropdown-content a:hover i {
    color: #0ABAB5;
    transform: scale(1.1);
}

/* 特殊高亮项 */
.dropdown-featured {
    background: linear-gradient(135deg, #fffbeb 0%, #fef3c7 100%) !important;
    border: 1px solid #fcd34d;
    font-weight: 600 !important;
    color: #92400e !important;
}

.dropdown-featured:hover {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%) !important;
    box-shadow: 0 4px 12px rgba(252,211,77,0.25);
    color: #78350f !important;
}

.dropdown-featured i {
    color: #f59e0b !important;
}

.dropdown-featured:hover i {
    color: #d97706 !important;
}

/* 查看完整产品体系介绍按钮 */
.dropdown-overview {
    background: linear-gradient(90deg, rgba(10,186,181,0.12) 0%, rgba(10,186,181,0.06) 100%) !important;
    border: 1px solid rgba(10,186,181,0.3) !important;
    color: #0ABAB5 !important;
    font-weight: 600 !important;
    position: relative;
}

.dropdown-overview::after {
    content: '\f35d';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    margin-left: 8px;
    transition: transform 0.3s ease;
}

.dropdown-overview:hover {
    background: linear-gradient(90deg, rgba(10,186,181,0.18) 0%, rgba(10,186,181,0.08) 100%) !important;
    border-color: #0ABAB5 !important;
    transform: translateX(2px);
}

.dropdown-overview:hover::after {
    transform: translateX(4px);
}

.dropdown-overview i {
    color: #0ABAB5 !important;
}

/* 内容组切换 */
.dropdown-content-group {
    display: none;
}

.dropdown-content-group.active {
    display: block;
}

/* 按钮样式 - 精致设计 */
.nav-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.btn {
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
    border: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

/* 立即咨询按钮 - 品牌色设计 */
.contact-btn {
    padding: 10px 28px;
    background: linear-gradient(135deg, #0ABAB5 0%, #0891b2 100%);
    color: white;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(10,186,181,0.3), inset 0 1px 0 rgba(255,255,255,0.2);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255,255,255,0.1);
    letter-spacing: 0.3px;
}

.contact-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.25), transparent);
    transition: left 0.6s ease;
}

.contact-btn::after {
    content: '\f0a9';
    font-family: 'Font Awesome 5 Free';
    font-weight: 900;
    margin-left: 8px;
    transition: transform 0.3s ease;
    display: inline-block;
}

.contact-btn:hover {
    background: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(10,186,181,0.4), inset 0 1px 0 rgba(255,255,255,0.25);
}

.contact-btn:hover::before {
    left: 100%;
}

.contact-btn:hover::after {
    transform: translateX(3px);
}

/* Mobile Menu */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: #333;
    cursor: pointer;
}

/* ==========================================================================
   移动端适配 - 768px及以下
   ========================================================================== */
@media (max-width: 768px) {
    .top-bar .container {
        flex-wrap: wrap;
        gap: 10px;
        font-size: 10px;
    }
    
    .top-bar-item {
        padding: 2px 6px;
    }
    
    .header {
        top: 0;
        height: 60px;
    }
    
    .logo {
        font-size: 22px;
    }
    
    .logo-slogan {
        font-size: 10px;
    }
    
    .nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(0, 0, 0, 0.95);
        flex-direction: column;
        padding: 80px 20px 20px;
        z-index: 9999;
        overflow-y: auto;
    }
    
    .nav.active {
        display: flex;
    }
    
    .nav a,
    .nav .dropdown-btn {
        color: white !important;
        padding: 15px 20px;
        font-size: 16px;
        width: 100%;
        text-align: left;
        border-bottom: 1px solid rgba(255,255,255,0.1);
    }
    
    .nav .dropdown-content {
        position: static;
        background: rgba(255,255,255,0.05);
        border: none;
        box-shadow: none;
        padding: 10px 0;
        margin: 0;
        display: none;
        grid-template-columns: 1fr;
        min-width: auto;
        transform: none;
        animation: none;
    }
    
    .nav .dropdown.active .dropdown-content {
        display: block;
    }
    
    .nav .dropdown-sidebar {
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.1);
        background: rgba(255,255,255,0.03);
    }
    
    .nav .dropdown-category {
        color: rgba(255,255,255,0.7);
    }
    
    .nav .dropdown-category.active,
    .nav .dropdown-category:hover {
        color: #0ABAB5;
        background: rgba(10,186,181,0.15);
    }
    
    .nav .dropdown-main {
        padding: 15px;
        max-height: none;
    }
    
    .nav .dropdown-content a {
        color: rgba(255,255,255,0.8) !important;
        padding: 10px 20px;
        font-size: 14px;
    }
    
    .nav .dropdown-content a:hover {
        color: white !important;
        background: rgba(255,255,255,0.1);
    }
    
    .nav-actions {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
        z-index: 10000;
    }
}

/* ==========================================================================
   平板端适配 - 769px到1024px
   ========================================================================== */
@media (min-width: 769px) and (max-width: 1024px) {
    .nav .dropdown-content {
        min-width: 700px;
        max-width: 900px;
    }
    
    .dropdown-sidebar {
        width: 200px;
    }
    
    .dropdown-main {
        padding: 25px 30px;
    }
    
    .dropdown-items {
        grid-template-columns: repeat(auto-fill, minmax(170px, 1fr));
    }
}

/* ==========================================================================
   小屏幕移动端 - 480px及以下
   ========================================================================== */
@media (max-width: 480px) {
    .top-bar {
        padding: 4px 0;
    }
    
    .top-bar .container {
        gap: 8px;
        font-size: 9px;
    }
    
    .header {
        height: 55px;
    }
    
    .logo {
        font-size: 20px;
    }
    
    .contact-btn {
        padding: 8px 20px;
        font-size: 13px;
    }
}