/* roulang page: index */
:root {
            --brand: #2E86FF;
            --brand-hover: #1D6FE0;
            --accent: #FF5E3A;
            --accent-hover: #E6492D;
            --text-primary: #1E293B;
            --text-body: #475569;
            --text-muted: #94A3B8;
            --bg-alt: #F8FAFC;
            --highlight-bg: #F0F5FF;
            --footer-bg: #1E293B;
            --border-light: #E2E8F0;
            --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
            --nav-height: 72px;
            --max-width: 1200px;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            scroll-padding-top: var(--nav-height);
        }

        body {
            margin: 0;
            padding: 0;
            font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            font-size: 16px;
            line-height: 1.7;
            font-weight: 400;
            color: var(--text-body);
            background-color: #FFFFFF;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--brand);
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: var(--brand-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
            border: none;
            outline: none;
        }
        input,
        textarea {
            font-family: inherit;
            outline: none;
        }
        h1,
        h2,
        h3,
        h4 {
            color: var(--text-primary);
            margin: 0;
        }
        h1 {
            font-size: 44px;
            font-weight: 700;
            line-height: 1.2;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 36px;
            font-weight: 600;
            line-height: 1.3;
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 24px;
            font-weight: 600;
            line-height: 1.4;
        }
        h4 {
            font-size: 20px;
            font-weight: 600;
            line-height: 1.4;
        }

        .container-site {
            max-width: var(--max-width);
            margin-left: auto;
            margin-right: auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ===== 导航 ===== */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--nav-height);
            background: #FFFFFF;
            z-index: 1000;
            border-bottom: 1px solid #E8ECF1;
            transition: box-shadow 0.3s ease;
        }
        .site-nav.scrolled {
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.06);
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .nav-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: -0.01em;
            white-space: nowrap;
            text-decoration: none;
            flex-shrink: 0;
        }
        .nav-logo:hover {
            color: var(--text-primary);
        }
        .nav-logo svg {
            flex-shrink: 0;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .nav-links a {
            color: var(--text-body);
            font-size: 15px;
            font-weight: 500;
            text-decoration: none;
            transition: color 0.2s ease;
            white-space: nowrap;
        }
        .nav-links a:hover {
            color: var(--brand);
        }
        .nav-cta-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            border-radius: var(--btn);
            font-size: 15px;
            font-weight: 600;
            border: 2px solid var(--accent);
            color: var(--accent);
            background: #FFFFFF;
            transition: all 0.2s ease;
            white-space: nowrap;
            text-decoration: none;
            min-height: 44px;
        }
        .nav-cta-btn:hover {
            background: #FFF5F2;
            color: var(--accent-hover);
            border-color: var(--accent-hover);
        }

        /* 汉堡菜单 */
        .hamburger {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            background: transparent;
            border: none;
            cursor: pointer;
            gap: 5px;
            z-index: 1001;
            padding: 0;
            flex-shrink: 0;
        }
        .hamburger span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: all 0.3s ease;
            transform-origin: center;
        }
        .hamburger.active span:nth-child(1) {
            transform: translateY(7.5px) rotate(45deg);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
            transform: scaleX(0);
        }
        .hamburger.active span:nth-child(3) {
            transform: translateY(-7.5px) rotate(-45deg);
        }

        /* 移动端菜单面板 */
        .mobile-menu {
            display: none;
            position: fixed;
            top: var(--nav-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            z-index: 999;
            flex-direction: column;
            padding: 32px 24px;
            gap: 4px;
            overflow-y: auto;
        }
        .mobile-menu.active {
            display: flex;
        }
        .mobile-menu a {
            display: flex;
            align-items: center;
            font-size: 18px;
            font-weight: 600;
            color: var(--text-primary);
            padding: 14px 16px;
            border-radius: 12px;
            text-decoration: none;
            min-height: 44px;
            transition: background 0.15s ease;
        }
        .mobile-menu a:hover {
            background: #F1F5F9;
        }
        .mobile-menu .mobile-cta {
            margin-top: 8px;
            background: var(--accent);
            color: #FFFFFF;
            justify-content: center;
            border-radius: var(--btn);
            font-weight: 700;
            min-height: 48px;
        }
        .mobile-menu .mobile-cta:hover {
            background: var(--accent-hover);
            color: #FFFFFF;
        }

        /* ===== Hero ===== */
        .hero-section {
            padding-top: calc(var(--nav-height) + 48px);
            padding-bottom: 64px;
            background: #FFFFFF;
            position: relative;
            overflow: hidden;
        }
        .hero-inner {
            display: flex;
            align-items: center;
            gap: 48px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .hero-left {
            flex: 0 0 58%;
            min-width: 0;
        }
        .hero-right {
            flex: 0 0 38%;
            min-width: 0;
            position: relative;
            border-radius: 20px;
            overflow: hidden;
            aspect-ratio: 4 / 3;
            background: #E8ECF1;
        }
        .hero-right img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        .hero-right::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(46, 134, 255, 0.08) 0%, transparent 60%);
            pointer-events: none;
            z-index: 1;
        }
        .hero-wave {
            position: absolute;
            bottom: -2px;
            left: 0;
            right: 0;
            height: 60px;
            z-index: 2;
            pointer-events: none;
            opacity: 0.7;
        }
        .hero-wave::before {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 100%;
            background: repeating-linear-gradient(90deg, transparent, transparent 8px, rgba(46, 134, 255, 0.18) 8px, rgba(46, 134, 255, 0.18) 9px);
            mask-image: linear-gradient(to top, rgba(0, 0, 0, 0.5) 0%, transparent 100%);
            -webkit-mask-image: linear-gradient(to top, rgba(0, 0, 0, 0.5) 0%, transparent 100%);
            animation: waveDrift 12s ease-in-out infinite;
        }
        @keyframes waveDrift {
            0%,
            100% {
                transform: translateX(0);
            }
            25% {
                transform: translateX(4px);
            }
            50% {
                transform: translateX(-2px);
            }
            75% {
                transform: translateX(3px);
            }
        }
        .hero-subtitle {
            font-size: 18px;
            color: #64748B;
            line-height: 1.6;
            margin-top: 16px;
            margin-bottom: 0;
            max-width: 480px;
        }
        .hero-cta-group {
            display: flex;
            gap: 14px;
            margin-top: 28px;
            flex-wrap: wrap;
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 30px;
            border-radius: var(--btn);
            font-size: 16px;
            font-weight: 700;
            background: var(--brand);
            color: #FFFFFF;
            text-decoration: none;
            transition: all 0.2s ease;
            min-height: 48px;
            min-width: 44px;
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-primary:hover {
            background: var(--brand-hover);
            color: #FFFFFF;
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(46, 134, 255, 0.3);
        }
        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 30px;
            border-radius: var(--btn);
            font-size: 16px;
            font-weight: 600;
            background: transparent;
            color: var(--brand);
            text-decoration: none;
            border: 2px solid var(--brand);
            transition: all 0.2s ease;
            min-height: 48px;
            min-width: 44px;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-ghost:hover {
            background: #F0F6FF;
            color: var(--brand-hover);
            border-color: var(--brand-hover);
        }
        .btn-accent {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 30px;
            border-radius: var(--btn);
            font-size: 16px;
            font-weight: 700;
            background: var(--accent);
            color: #FFFFFF;
            text-decoration: none;
            transition: all 0.2s ease;
            min-height: 48px;
            min-width: 44px;
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            color: #FFFFFF;
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(255, 94, 58, 0.3);
        }
        .hero-trust-badges {
            display: flex;
            gap: 24px;
            margin-top: 24px;
            flex-wrap: wrap;
        }
        .trust-badge {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            font-weight: 500;
            color: #64748B;
            white-space: nowrap;
        }
        .trust-badge .badge-icon {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #F0F6FF;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: var(--brand);
            flex-shrink: 0;
        }
        .trust-badge strong {
            color: var(--text-primary);
            font-weight: 700;
        }

        /* ===== 板块通用 ===== */
        .section-block {
            padding: 72px 0;
        }
        .section-block.alt-bg {
            background: var(--bg-alt);
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: var(--brand);
            margin-bottom: 8px;
        }
        .section-title {
            margin-bottom: 12px;
        }
        .section-desc {
            color: #64748B;
            font-size: 17px;
            max-width: 600px;
            margin-top: 8px;
            margin-bottom: 0;
            line-height: 1.6;
        }

        /* ===== 亮点网格 ===== */
        .features-grid {
            display: grid;
            grid-template-columns: 1.4fr 1fr 1fr;
            grid-template-rows: auto auto;
            gap: 20px;
            margin-top: 40px;
        }
        .features-grid .feat-card {
            background: #FFFFFF;
            border-radius: var(--card);
            padding: 28px 24px;
            box-shadow: var(--card-shadow);
            transition: all 0.3s ease;
            border: 1px solid transparent;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .features-grid .feat-card:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translateY(-4px);
            border-color: #E8ECF1;
        }
        .features-grid .feat-card.feat-large {
            grid-row: span 2;
            padding: 36px 30px;
        }
        .feat-card .feat-icon-area {
            width: 64px;
            height: 64px;
            border-radius: 14px;
            background: #F0F6FF;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            overflow: hidden;
        }
        .feat-card .feat-icon-area img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 14px;
        }
        .feat-card .feat-icon-placeholder {
            width: 64px;
            height: 64px;
            border-radius: 14px;
            background: #F0F6FF;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 28px;
            color: var(--brand);
            flex-shrink: 0;
        }
        .feat-card h3 {
            font-size: 20px;
            margin: 0;
        }
        .feat-card.feat-large h3 {
            font-size: 24px;
        }
        .feat-card p {
            font-size: 14px;
            color: #64748B;
            margin: 0;
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .feat-card.feat-large p {
            -webkit-line-clamp: 3;
        }
        .feat-icon-only {
            display: flex;
            align-items: center;
            justify-content: center;
            background: transparent !important;
            box-shadow: none !important;
            border: none !important;
            padding: 20px !important;
            min-height: 140px;
        }
        .feat-icon-only:hover {
            transform: none !important;
            box-shadow: none !important;
        }
        .feat-icon-only .icon-illustration {
            width: 100px;
            height: 100px;
            border-radius: 50%;
            background: linear-gradient(135deg, #F0F6FF 0%, #E8F0FE 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 42px;
            color: var(--brand);
            animation: pulseSoft 3s ease-in-out infinite;
        }
        @keyframes pulseSoft {
            0%,
            100% {
                transform: scale(1);
            }
            50% {
                transform: scale(1.06);
            }
        }

        /* ===== 案例瀑布 ===== */
        .cases-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin-top: 40px;
        }
        .case-card {
            background: #FFFFFF;
            border-radius: var(--card);
            overflow: hidden;
            box-shadow: var(--card-shadow);
            transition: all 0.3s ease;
            cursor: default;
            position: relative;
            display: flex;
            flex-direction: column;
        }
        .case-card:hover {
            box-shadow: var(--card-shadow-hover);
            transform: translateY(-4px);
        }
        .case-card-img {
            width: 100%;
            aspect-ratio: 4 / 3;
            overflow: hidden;
            background: #E8ECF1;
            position: relative;
        }
        .case-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.4s ease;
        }
        .case-card:hover .case-card-img img {
            transform: scale(1.04);
        }
        .case-card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .case-card-body h4 {
            font-size: 17px;
            margin: 0;
            font-weight: 600;
        }
        .case-card-body p {
            font-size: 14px;
            color: #64748B;
            margin: 0;
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .case-tags {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            margin-top: 4px;
        }
        .case-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            padding: 4px 10px;
            border-radius: var(--tag);
            background: #F0F6FF;
            color: var(--brand);
            white-space: nowrap;
        }
        .case-hover-detail {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.97);
            padding: 14px 20px;
            font-size: 13px;
            color: var(--text-body);
            transform: translateY(100%);
            transition: transform 0.3s ease;
            border-top: 1px solid #E8ECF1;
            line-height: 1.5;
            pointer-events: none;
        }
        .case-card:hover .case-hover-detail {
            transform: translateY(0);
        }

        /* ===== 方案对比 ===== */
        .pricing-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0;
            margin-top: 40px;
            border-radius: var(--card);
            overflow: hidden;
            border: 1px solid #E8ECF1;
        }
        .pricing-col {
            background: #FFFFFF;
            padding: 32px 24px;
            display: flex;
            flex-direction: column;
            gap: 16px;
            position: relative;
            border-right: 1px solid #E8ECF1;
        }
        .pricing-col:last-child {
            border-right: none;
        }
        .pricing-col.featured {
            background: var(--highlight-bg);
            border-left: 3px solid var(--brand);
            border-right: 3px solid var(--brand);
            position: relative;
            z-index: 2;
            margin: -1px 0;
        }
        .pricing-badge {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            padding: 5px 14px;
            border-radius: 20px;
            background: var(--accent);
            color: #FFFFFF;
            align-self: flex-start;
            letter-spacing: 0.03em;
        }
        .pricing-col h3 {
            font-size: 22px;
            margin: 0;
        }
        .pricing-price {
            font-size: 32px;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1;
        }
        .pricing-price span {
            font-size: 15px;
            font-weight: 400;
            color: #64748B;
        }
        .pricing-features {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .pricing-features li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            font-size: 14px;
            color: var(--text-body);
            line-height: 1.5;
        }
        .pricing-features li i {
            color: #22C55E;
            font-size: 15px;
            margin-top: 2px;
            flex-shrink: 0;
        }
        .pricing-cta {
            margin-top: auto;
            padding-top: 8px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            margin-top: 36px;
        }
        .faq-item {
            background: #FFFFFF;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--card-shadow);
            border: 1px solid transparent;
            transition: all 0.2s ease;
        }
        .faq-item:hover {
            border-color: #E8ECF1;
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 18px 20px;
            cursor: pointer;
            min-height: 56px;
            user-select: none;
            gap: 16px;
            background: transparent;
            width: 100%;
            border: none;
            text-align: left;
            font-family: inherit;
            color: var(--text-primary);
        }
        .faq-question h4 {
            margin: 0;
            font-size: 17px;
            font-weight: 600;
            flex: 1;
            min-width: 0;
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            background: #F1F5F9;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: all 0.3s ease;
            font-size: 16px;
            color: #64748B;
            font-weight: 700;
            line-height: 1;
        }
        .faq-item.open .faq-icon {
            background: var(--brand);
            color: #FFFFFF;
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 20px;
            font-size: 15px;
            color: #64748B;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 20px 20px;
        }

        /* ===== 联系CTA ===== */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            margin-top: 36px;
            align-items: start;
        }
        .contact-form {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .contact-form input,
        .contact-form textarea {
            width: 100%;
            padding: 14px 16px;
            border-radius: var(--input);
            border: 1.5px solid var(--border-light);
            font-size: 15px;
            color: var(--text-primary);
            background: #FFFFFF;
            transition: all 0.2s ease;
            font-family: inherit;
            resize: vertical;
            min-height: 48px;
        }
        .contact-form input:focus,
        .contact-form textarea:focus {
            border-color: var(--brand);
            box-shadow: 0 0 0 4px rgba(46, 134, 255, 0.08);
            outline: none;
        }
        .contact-form textarea {
            min-height: 120px;
        }
        .btn-submit {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 14px 30px;
            border-radius: var(--btn);
            font-size: 16px;
            font-weight: 700;
            background: var(--brand);
            color: #FFFFFF;
            border: none;
            cursor: pointer;
            transition: all 0.2s ease;
            min-height: 48px;
            min-width: 140px;
            align-self: flex-start;
            position: relative;
        }
        .btn-submit:hover {
            background: var(--brand-hover);
            box-shadow: 0 4px 16px rgba(46, 134, 255, 0.3);
        }
        .btn-submit.loading {
            pointer-events: none;
            opacity: 0.75;
            color: transparent;
        }
        .btn-submit.loading::after {
            content: '';
            position: absolute;
            width: 20px;
            height: 20px;
            border: 2.5px solid #FFFFFF;
            border-top-color: transparent;
            border-radius: 50%;
            animation: spin 0.7s linear infinite;
        }
        @keyframes spin {
            to {
                transform: rotate(360deg);
            }
        }
        .contact-info {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .contact-info-item {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 15px;
            color: var(--text-body);
            line-height: 1.5;
        }
        .contact-info-item i {
            color: var(--brand);
            font-size: 18px;
            margin-top: 2px;
            flex-shrink: 0;
            width: 20px;
            text-align: center;
        }
        .contact-brand-img {
            width: 100%;
            max-width: 280px;
            border-radius: 16px;
            overflow: hidden;
            margin-top: 8px;
        }
        .contact-brand-img img {
            width: 100%;
            height: auto;
            object-fit: cover;
            border-radius: 16px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--footer-bg);
            color: #CBD5E1;
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 32px;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-col h4 {
            color: #FFFFFF;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
            letter-spacing: 0.01em;
        }
        .footer-col p {
            font-size: 14px;
            line-height: 1.6;
            color: #94A3B8;
            margin: 0;
        }
        .footer-col ul {
            list-style: none;
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-col ul a {
            font-size: 14px;
            color: #94A3B8;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        .footer-col ul a:hover {
            color: #FFFFFF;
        }
        .social-icons {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
        }
        .social-icon-circle {
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #94A3B8;
            font-size: 16px;
            transition: all 0.2s ease;
            text-decoration: none;
        }
        .social-icon-circle:hover {
            background: var(--brand);
            color: #FFFFFF;
        }
        .footer-bottom {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 20px 24px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            margin-top: 32px;
            text-align: center;
            font-size: 13px;
            color: #64748B;
        }

        /* ===== Skeleton ===== */
        .skeleton {
            background: linear-gradient(90deg, #E8ECF1 25%, #F1F5F9 50%, #E8ECF1 75%);
            background-size: 200% 100%;
            animation: shimmer 1.5s ease-in-out infinite;
        }
        @keyframes shimmer {
            0% {
                background-position: 200% 0;
            }
            100% {
                background-position: -200% 0;
            }
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            h1 {
                font-size: 36px;
            }
            h2 {
                font-size: 30px;
            }
            h3 {
                font-size: 21px;
            }
            .hero-inner {
                flex-direction: column;
                gap: 32px;
            }
            .hero-left {
                flex: 1 1 auto;
                text-align: center;
            }
            .hero-subtitle {
                max-width: 100%;
            }
            .hero-cta-group {
                justify-content: center;
            }
            .hero-trust-badges {
                justify-content: center;
            }
            .hero-right {
                flex: 0 0 auto;
                width: 100%;
                max-width: 500px;
                aspect-ratio: 16 / 9;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
                grid-template-rows: auto;
            }
            .features-grid .feat-card.feat-large {
                grid-row: span 1;
                grid-column: span 2;
            }
            .feat-icon-only {
                grid-column: span 2;
            }
            .cases-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .pricing-grid {
                grid-template-columns: 1fr;
                gap: 0;
                border-radius: var(--card);
            }
            .pricing-col {
                border-right: none;
                border-bottom: 1px solid #E8ECF1;
            }
            .pricing-col:last-child {
                border-bottom: none;
            }
            .pricing-col.featured {
                border-left: none;
                border-right: none;
                border-top: 3px solid var(--brand);
                border-bottom: 3px solid var(--brand);
                margin: 0;
            }
            .contact-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 30px;
            }
            h2 {
                font-size: 26px;
            }
            h3 {
                font-size: 19px;
            }
            h4 {
                font-size: 17px;
            }
            .nav-links {
                display: none;
            }
            .hamburger {
                display: flex;
            }
            .nav-inner {
                padding: 0 16px;
            }
            .mobile-menu.active {
                display: flex;
            }
            .hero-section {
                padding-top: calc(var(--nav-height) + 24px);
                padding-bottom: 40px;
            }
            .hero-inner {
                padding: 0 16px;
                gap: 24px;
            }
            .hero-right {
                max-width: 100%;
                aspect-ratio: 16 / 9;
            }
            .hero-subtitle {
                font-size: 16px;
            }
            .hero-cta-group {
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
            .btn-primary,
            .btn-ghost,
            .btn-accent {
                width: 100%;
                max-width: 320px;
                justify-content: center;
                font-size: 15px;
                padding: 13px 24px;
                min-height: 46px;
            }
            .hero-trust-badges {
                gap: 14px;
                justify-content: center;
            }
            .trust-badge {
                font-size: 13px;
            }
            .section-block {
                padding: 48px 0;
            }
            .container-site {
                padding-left: 16px;
                padding-right: 16px;
            }
            .features-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
            .features-grid .feat-card.feat-large {
                grid-column: span 2;
            }
            .feat-icon-only {
                grid-column: span 2;
                min-height: 100px;
            }
            .feat-icon-only .icon-illustration {
                width: 70px;
                height: 70px;
                font-size: 30px;
            }
            .feat-card {
                padding: 20px 16px;
            }
            .feat-card.feat-large {
                padding: 24px 18px;
            }
            .feat-card h3 {
                font-size: 17px;
            }
            .feat-card.feat-large h3 {
                font-size: 19px;
            }
            .feat-card p {
                font-size: 13px;
            }
            .cases-grid {
                grid-template-columns: 1fr;
                gap: 14px;
            }
            .case-card-body h4 {
                font-size: 16px;
            }
            .pricing-col {
                padding: 24px 18px;
            }
            .pricing-col h3 {
                font-size: 19px;
            }
            .pricing-price {
                font-size: 26px;
            }
            .faq-question {
                padding: 15px 16px;
                min-height: 50px;
            }
            .faq-question h4 {
                font-size: 15px;
            }
            .faq-answer {
                padding: 0 16px;
                font-size: 14px;
            }
            .faq-item.open .faq-answer {
                padding: 0 16px 16px;
            }
            .contact-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .contact-brand-img {
                max-width: 100%;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .site-nav .nav-cta-btn {
                display: none;
            }
        }

        @media (max-width: 520px) {
            h1 {
                font-size: 26px;
            }
            h2 {
                font-size: 22px;
            }
            .nav-logo {
                font-size: 18px;
                gap: 6px;
            }
            .nav-logo svg {
                width: 28px;
                height: 28px;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 10px;
            }
            .features-grid .feat-card.feat-large {
                grid-column: span 1;
            }
            .feat-icon-only {
                grid-column: span 1;
                min-height: 80px;
            }
            .hero-trust-badges {
                flex-direction: column;
                align-items: center;
                gap: 10px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .pricing-grid {
                border-radius: 12px;
            }
            .case-hover-detail {
                font-size: 12px;
                padding: 10px 14px;
            }
            .btn-submit {
                width: 100%;
                justify-content: center;
            }
        }

        @media (min-width: 769px) {
            .mobile-menu.active {
                display: none !important;
            }
        }