* { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: 'Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif; background: #fff; color: #333; }
        a { text-decoration: none; color: inherit; }
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-thumb { background: #c1c1c1; border-radius: 4px; }
        
        /* 导航栏 */
        .header {
            background: #fff;
            border-bottom: 1px solid #e5e7eb;
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-inner {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
            height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .logo-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, #4d94ff 0%, #0066ff 50%, #0052cc 100%);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: inset 0 1px 0 rgba(255,255,255,0.2);
        }
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            background: linear-gradient(90deg, #0052cc, #3385ff, #00a0ff, #3385ff, #0052cc);
            background-size: 200% auto;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            animation: logo-gradient 4s linear infinite;
        }
        @keyframes logo-gradient {
            0%   { background-position: 0% center; }
            100% { background-position: 200% center; }
        }
        .logo-img {
            height: 35px;
            width: 130px;
            background-size: contain;
            background-repeat: no-repeat;
            background-position: left center;
        }
        
        /* 主导航 */
        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-item {
            position: relative;
            padding: 24px 16px;
            font-size: 15px;
            color: #374151;
            font-weight: 500;
            cursor: pointer;
            transition: color 0.2s;
        }
        .nav-item:hover { color: #0066ff; }
        .nav-item .arrow {
            font-size: 10px;
            margin-left: 4px;
            transition: transform 0.2s;
        }
        .nav-item:hover .arrow { transform: rotate(180deg); }
        
        /* 8列解决方案下拉 */
        .dropdown-8col {
            display: none;
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.15);
            padding: 32px;
            width: 1100px;
            z-index: 100;
        }
        .nav-dropdown:hover .dropdown-8col {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            animation: fadeInDown 0.2s ease;
        }
        @keyframes fadeInDown {
            from { opacity: 0; transform: translateX(-50%) translateY(-10px); }
            to { opacity: 1; transform: translateX(-50%) translateY(0); }
        }
        .dropdown-col h4 {
            font-size: 14px;
            color: #9ca3af;
            text-transform: uppercase;
            margin-bottom: 16px;
            letter-spacing: 1px;
        }
        .dropdown-col ul { list-style: none; }
        .dropdown-col li { margin-bottom: 12px; }
        .dropdown-col a {
            color: #374151;
            font-size: 14px;
            transition: color 0.2s;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .dropdown-col a:hover { color: #0066ff; }
        .dropdown-col a i {
            width: 20px;
            text-align: center;
            color: #0066ff;
            font-size: 14px;
        }
        
        /* 云安付平台三栏下拉 */
        .dropdown-3col {
            display: none;
            position: absolute;
            top: 100%;
            left: 50%;
            transform: translateX(-50%);
            background: #fff;
            border-radius: 12px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.15);
            padding: 20px;
            width: 720px;
            z-index: 100;
        }
        .nav-dropdown:hover .dropdown-3col {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            animation: fadeInDown 0.2s ease;
        }
        .dropdown-card {
            padding: 10px;
            border-radius: 8px;
            background: #f8fafc;
            transition: all 0.2s;
        }
        .dropdown-card:hover {
            background: #f0f7ff;
            transform: translateY(-2px);
        }
        .dropdown-card i {
            font-size: 18px;
            color: #0066ff;
            margin-bottom: 6px;
        }
        .dropdown-card h5 {
            font-size: 13px;
            color: #00112a;
            margin-bottom: 3px;
        }
        .dropdown-card p {
            font-size: 11px;
            color: #6b7280;
            line-height: 1.4;
        }
        .dropdown-solutions {
            width: 640px;
            padding: 16px;
            gap: 12px;
        }
        .nav-dropdown:hover .dropdown-solutions {
            grid-template-columns: repeat(4, 1fr);
            gap: 12px;
        }

        /* 右侧按钮 */
        .nav-btns {
            display: flex;
            align-items: center;
            gap: 16px;
        }
        .btn-login {
            background: linear-gradient(135deg, #0066ff 0%, #0052cc 100%);
            color: #fff;
            padding: 10px 24px;
            border-radius: 6px;
            font-weight: 500;
            font-size: 14px;
            transition: all 0.2s;
        }
        .btn-login:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,102,255,0.3);
        }
        .btn-register {
            background: linear-gradient(135deg, #0066ff 0%, #0052cc 100%);
            color: #fff;
            padding: 10px 24px;
            border-radius: 6px;
            font-weight: 500;
            font-size: 14px;
            transition: all 0.2s;
        }
        .btn-register:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0,102,255,0.3);
        }
        
        /* Hero区域 */
        .hero {
            background: linear-gradient(135deg, #00112a 0%, #002855 50%, #00112a 100%);
            min-height: 600px;
            display: flex;
            align-items: center;
            position: relative;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: radial-gradient(ellipse at 30% 20%, rgba(0,102,255,0.2) 0%, transparent 50%),
                        radial-gradient(ellipse at 70% 80%, rgba(0,102,255,0.15) 0%, transparent 50%);
        }
        .hero-inner {
            max-width: 1400px;
            margin: 0 auto;
            padding: 80px 40px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            position: relative;
            z-index: 1;
        }
        .hero-content h1 {
            font-size: 48px;
            font-weight: 700;
            color: #fff;
            line-height: 1.2;
            margin-bottom: 24px;
        }
        .hero-content h1 span { color: #60a5fa; }
        .hero-content p {
            font-size: 18px;
            color: #94a3b8;
            line-height: 1.8;
            margin-bottom: 36px;
        }
        .hero-btns {
            display: flex;
            gap: 16px;
        }
        .btn-primary {
            background: linear-gradient(135deg, #0066ff 0%, #0052cc 100%);
            color: #fff;
            padding: 14px 36px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 15px;
            display: inline-block;
            transition: all 0.2s;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0,102,255,0.4);
        }
        .btn-outline {
            border: 1px solid rgba(255,255,255,0.3);
            color: #fff;
            padding: 14px 36px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 15px;
            display: inline-block;
            transition: all 0.2s;
        }
        .btn-outline:hover {
            border-color: #fff;
            background: rgba(255,255,255,0.1);
        }
        .hero-visual {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .hero-circle {
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0,102,255,0.3) 0%, transparent 70%);
            border-radius: 50%;
            display: flex;
            justify-content: center;
            align-items: center;
            animation: pulse 3s ease-in-out infinite;
        }
        @keyframes pulse {
            0%, 100% { transform: scale(1); opacity: 0.8; }
            50% { transform: scale(1.05); opacity: 1; }
        }
        .hero-circle i {
            font-size: 150px;
            color: rgba(255,255,255,0.1);
        }
        
        /* 三栏交互式解决方案区 */
        .solutions-section {
            padding: 80px 0;
            background: #f8fafc;
        }
        .solutions-inner {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 36px;
            font-weight: 700;
            color: #00112a;
            margin-bottom: 16px;
        }
        .section-title p {
            font-size: 18px;
            color: #6b7280;
        }
        
        .sol-panel {
            display: grid;
            grid-template-columns: 220px 260px 1fr;
            background: #fff;
            border-radius: 16px;
            box-shadow: 0 4px 24px rgba(0,0,0,0.08);
            overflow: hidden;
            min-height: 480px;
        }
        
        /* 左侧分类 */
        .sol-cats {
            background: #f8fafc;
            border-right: 1px solid #e5e7eb;
        }
        .sol-cat {
            padding: 20px 24px;
            cursor: pointer;
            border-left: 3px solid transparent;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .sol-cat:hover,
        .sol-cat.active {
            background: #fff;
            border-left-color: #0066ff;
        }
        .sol-cat i {
            font-size: 20px;
            color: #6b7280;
        }
        .sol-cat.active i { color: #0066ff; }
        .sol-cat span {
            font-size: 14px;
            color: #374151;
            font-weight: 500;
        }
        .sol-cat.active span { color: #0066ff; }
        
        /* 中间子项 */
        .sol-subs {
            border-right: 1px solid #e5e7eb;
            padding: 16px 0;
            overflow-y: auto;
        }
        .sol-sub {
            padding: 14px 24px;
            cursor: pointer;
            color: #4b5563;
            font-size: 14px;
            transition: all 0.2s;
            border-bottom: 1px dashed #f3f4f6;
        }
        .sol-sub:last-child { border-bottom: none; }
        .sol-sub:hover,
        .sol-sub.active {
            background: #f0f7ff;
            color: #0066ff;
        }
        
        /* 右侧详情 */
        .sol-detail {
            padding: 32px;
        }
        .sol-detail-content {
            display: none;
        }
        .sol-detail-content.active { display: block; }
        .sol-detail h3 {
            font-size: 24px;
            color: #00112a;
            margin-bottom: 16px;
        }
        .sol-detail p {
            color: #6b7280;
            line-height: 1.8;
            margin-bottom: 24px;
        }
        .sol-detail-features {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-bottom: 32px;
        }
        .sol-feature {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: #374151;
        }
        .sol-feature i {
            color: #10b981;
        }
        /* 核心能力 */
        .features-section {
            padding: 100px 0;
            background: #fff;
        }
        .features-inner {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 32px;
        }
        .feature-card {
            background: #fff;
            border: 1px solid #e5e7eb;
            border-radius: 12px;
            padding: 32px;
            transition: all 0.3s;
        }
        .feature-card:hover {
            border-color: #0066ff;
            box-shadow: 0 8px 32px rgba(0,102,255,0.1);
            transform: translateY(-4px);
        }
        .feature-icon {
            width: 56px;
            height: 56px;
            background: linear-gradient(135deg, #0066ff 0%, #0052cc 100%);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 20px;
        }
        .feature-icon i {
            font-size: 24px;
            color: #fff;
        }
        .feature-card h3 {
            font-size: 18px;
            color: #00112a;
            margin-bottom: 12px;
        }
        .feature-card p {
            font-size: 14px;
            color: #6b7280;
            line-height: 1.7;
        }
        
        /* CTA区域 */
        .cta-section {
            background: linear-gradient(135deg, #00112a 0%, #002855 100%);
            padding: 80px 0;
            text-align: center;
        }
        .cta-inner {
            max-width: 800px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .cta-inner h2 {
            font-size: 36px;
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-inner p {
            font-size: 18px;
            color: #94a3b8;
            margin-bottom: 32px;
        }
        
        /* 页脚 */
        .footer {
            background: #00112a;
            padding: 60px 0 30px;
            color: #9ca3af;
        }
        .footer-inner {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr repeat(4, 1fr);
            gap: 48px;
            margin-bottom: 48px;
        }
        .footer-brand .logo-text {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: #6b7280;
        }
        .footer-col h4 {
            font-size: 14px;
            color: #fff;
            font-weight: 600;
            margin-bottom: 20px;
        }
        .footer-col ul { list-style: none; }
        .footer-col li { margin-bottom: 12px; }
        .footer-col a {
            color: #9ca3af;
            font-size: 14px;
            transition: color 0.2s;
        }
        .footer-col a:hover { color: #fff; }
        .footer-col span {
            color: #9ca3af;
            font-size: 14px;
        }
        .footer-bottom {
            border-top: 1px solid #374151;
            padding-top: 24px;
            text-align: center;
            font-size: 13px;
        }

        /* ===== 响应式：汉堡菜单 ===== */
        .nav-toggle { display: none; width: 40px; height: 40px; background: none; border: none; cursor: pointer; flex-direction: column; justify-content: center; align-items: center; gap: 5px; padding: 0; }
        .nav-toggle span { display: block; width: 22px; height: 2px; background: #00112a; border-radius: 2px; transition: transform .25s, opacity .25s; }
        .nav-toggle.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
        .mobile-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; background: #fff; border-top: 1px solid #e5e7eb; box-shadow: 0 8px 24px rgba(0,0,0,0.08); max-height: calc(100vh - 72px); overflow-y: auto; z-index: 999; padding: 8px 0 24px; }
        .mobile-menu.open { display: block; }
        .m-menu-inner { padding: 0 20px; }
        .m-item { display: flex; align-items: center; justify-content: space-between; padding: 14px 4px; font-size: 15px; color: #374151; font-weight: 500; border-bottom: 1px solid #f3f4f6; cursor: pointer; text-decoration: none; }
        .m-toggle i { font-size: 12px; color: #9ca3af; transition: transform .2s; }
        .m-toggle.open i { transform: rotate(180deg); }
        .m-sub { display: none; padding: 4px 0 10px 16px; background: #fafafa; }
        .m-sub.open { display: block; }
        .m-sub a { display: block; padding: 11px 4px; font-size: 14px; color: #6b7280; text-decoration: none; border-bottom: 1px dashed #e5e7eb; }
        .m-sub a:last-child { border-bottom: none; }
        .m-btns { display: flex; gap: 12px; padding: 20px 4px 4px; }
        .m-btns .btn-login, .m-btns .btn-register { flex: 1; text-align: center; padding: 12px; }

        /* 平板 ≤992 */
        @media (max-width: 992px) {
            .header-inner { padding: 0 24px; }
            .main-nav, .nav-btns { display: none; }
            .nav-toggle { display: flex; }
            .hero-inner { grid-template-columns: 1fr; padding: 60px 24px; gap: 36px; }
            .hero-content h1 { font-size: 36px; }
            .hero-content p { font-size: 16px; }
            .hero-visual { order: -1; max-width: 280px; margin: 0 auto; }
            .hero-circle { width: 220px; height: 220px; }
            .hero-circle i { font-size: 90px; }
            .solutions-inner, .features-inner, .footer-inner, .cta-inner { padding-left: 24px; padding-right: 24px; }
            .section-title h2 { font-size: 28px; }
            .section-title p { font-size: 16px; }
            .sol-panel { grid-template-columns: 180px 1fr; }
            .sol-cats .sol-cat { padding: 16px 18px; }
            .sol-cats .sol-cat i { font-size: 18px; }
            .sol-cats .sol-cat span { font-size: 13px; }
            .sol-detail { padding: 24px; }
            .features-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
            .cta-inner h2 { font-size: 28px; }
        }

        /* 手机 ≤768 */
        @media (max-width: 768px) {
            .header-inner { padding: 0 16px; height: 60px; }
            .mobile-menu { top: 60px; max-height: calc(100vh - 60px); }
            .hero { min-height: auto; }
            .hero-inner { padding: 40px 16px; gap: 28px; }
            .hero-content h1 { font-size: 26px; }
            .hero-content p { font-size: 15px; line-height: 1.7; margin-bottom: 28px; }
            .hero-btns { flex-direction: column; gap: 12px; }
            .hero-btns a { text-align: center; }
            .hero-circle { width: 160px; height: 160px; }
            .hero-circle i { font-size: 64px; }
            .solutions-section, .features-section, .cta-section { padding: 50px 0; }
            .solutions-inner, .features-inner, .footer-inner, .cta-inner { padding-left: 16px; padding-right: 16px; }
            .section-title { margin-bottom: 32px; }
            .section-title h2 { font-size: 24px; }
            .section-title p { font-size: 14px; }
            .sol-panel { grid-template-columns: 1fr; min-height: auto; }
            .sol-cats { display: flex; overflow-x: auto; border-right: none; border-bottom: 1px solid #e5e7eb; background: #fff; }
            .sol-cats::-webkit-scrollbar { height: 0; }
            .sol-cat { flex: 0 0 auto; border-left: none; border-bottom: 3px solid transparent; padding: 14px 16px; }
            .sol-cat:hover, .sol-cat.active { border-left-color: transparent; border-bottom-color: #0066ff; }
            .sol-cat i { font-size: 16px; }
            .sol-cat span { font-size: 13px; }
            .sol-subs { display: flex; overflow-x: auto; border-right: none; border-bottom: 1px solid #e5e7eb; padding: 8px 0; }
            .sol-subs::-webkit-scrollbar { height: 0; }
            .sol-sub { flex: 0 0 auto; border-bottom: none; border-right: 1px solid #f3f4f6; padding: 10px 16px; white-space: nowrap; }
            .sol-sub:last-child { border-right: none; }
            .sol-detail { padding: 20px; }
            .sol-detail h3 { font-size: 20px; }
            .sol-detail p { font-size: 14px; }
            .sol-detail-features { grid-template-columns: 1fr; gap: 10px; margin-bottom: 20px; }
            .sol-feature { font-size: 13px; }
            .features-grid { grid-template-columns: 1fr; gap: 16px; }
            .feature-card { padding: 24px; }
            .feature-card h3 { font-size: 16px; }
            .footer { padding: 40px 0 24px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-col h4 { margin-bottom: 14px; }
            .footer-col li { margin-bottom: 10px; }
            .cta-inner h2 { font-size: 24px; }
            .cta-inner p { font-size: 15px; margin-bottom: 24px; }
        }