/* ========== Reset & Base ========== */
        *,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scrollbar-gutter: stable;
            scroll-behavior: auto;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            color: #1A1A1A;
            background: transparent;
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        /* ========== Page Background ========== */
        .page-background {
            position: fixed;
            inset: 0;
            z-index: -1;
            background: url('/web/mf601/assets/img/bg-base.png') center / cover no-repeat;
        }

        /* ========== Navigation ========== */
        .site-nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            margin: 0 auto;
            width: 1140px;
            height: 64px;
            background: rgba(255, 255, 255, 0.72);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 8px;
            z-index: 1000;
            display: flex;
            align-items: center;
            transform: translateY(24px);
            transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                        width 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                        border-radius 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            will-change: transform;
        }

        .site-nav.is-sticky {
            transform: translateY(0);
            width: 100%;
            border-radius: 0;
        }

        .site-nav__inner {
            width: 1140px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 32px;
        }

        .site-nav__brand {
            display: flex;
            align-items: center;
            text-decoration: none;
            flex-shrink: 0;
        }

        .site-nav__brand img {
            max-height: 104px;
            height: auto;
            width: auto;
        }

        .site-nav__menu {
            display: flex;
            align-items: center;
            gap: 32px;
            list-style: none;
        }

        .site-nav__link {
            text-decoration: none;
            color: #4B5563;
            font-size: 14px;
            font-weight: 500;
            position: relative;
            transition: color 0.3s ease, transform 0.2s ease;
            padding: 4px 0;
            display: inline-block;
        }

        .site-nav__link:hover {
            color: #1A1A1A;
            transform: translateY(-1px);
        }

        .site-nav__link:active {
            transform: translateY(0) scale(0.97);
        }

        .site-nav__link.is-current {
            color: #1A1A1A;
            font-weight: 600;
        }

        .site-nav__link.is-current::after {
            content: '';
            position: absolute;
            bottom: -20px;
            left: 0;
            width: 100%;
            height: 3px;
            background: #1A1A1A;
            border-radius: 2px;
            animation: navIndicatorIn 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
        }

        @keyframes navIndicatorIn {
            from { transform: scaleX(0); opacity: 0; }
            to { transform: scaleX(1); opacity: 1; }
        }

        .site-nav__login {
            background: #1F2937;
            color: #FFFFFF;
            border: none;
            padding: 8px 24px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.3s ease;
            flex-shrink: 0;
        }

        .site-nav__login:hover {
            background: #374151;
        }

        /* ========== Hero Section ========== */
        .hero {
            padding-top: 128px;
            background: transparent;
        }

        .hero__container {
            width: 1140px;
            margin: 0 auto;
        }

        .hero__body {
            display: flex;
            align-items: flex-end;
            gap: 60px;
        }

        /* -- Hero Title Group -- */
        .hero__title-group {
            flex: 1;
            min-width: 0;
        }

        .hero__tag {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            border: 1px solid #D1D5DB;
            border-radius: 20px;
            font-size: 13px;
            color: #4B5563;
            margin-bottom: 20px;
            background: transparent;
        }

        .hero__tag-indicator {
            width: 6px;
            height: 6px;
            background: #10B981;
            border-radius: 50%;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.4; }
        }

        .hero__title {
            font-size: 72px;
            font-weight: 800;
            color: #1A1A1A;
            line-height: 1.2;
            margin-bottom: 8px;
            letter-spacing: 2px;
        }

        .hero__subtitle {
            font-size: 48px;
            font-weight: 700;
            color: #1A1A1A;
            line-height: 1.3;
            margin-bottom: 24px;
            letter-spacing: 2px;
        }

        /* -- Hero Info Group -- */
        .hero__info-group {
            flex: 1;
            min-width: 0;
            padding-top: 16px;
        }

        .hero__description {
            font-size: 15px;
            color: #6B7280;
            line-height: 1.8;
            margin-bottom: 28px;
        }

        .hero__features {
            display: flex;
            gap: 32px;
            margin-bottom: 32px;
        }

        .hero__feature {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 15px;
            color: #374151;
            font-weight: 500;
        }

        .hero__feature img {
            width: 20px;
            height: 20px;
        }

        .hero__action {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 100%;
            background: #1F2937;
            color: #FFFFFF;
            border: none;
            padding: 16px 48px;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
            text-decoration: none;
        }

        .hero__action:hover {
            background: #374151;
            transform: translateY(-1px);
            box-shadow: 0 8px 24px rgba(31, 41, 55, 0.25);
        }

        .hero__action-icon {
            margin-left: 8px;
            transition: transform 0.3s ease;
        }

        .hero__action:hover .hero__action-icon {
            transform: translateX(3px);
        }

        /* ========== Hero Visual ========== */
        .hero-visual {
            width: 1140px;
            margin: 48px auto 0;
        }

        .hero-visual__card {
            position: relative;
            width: 100%;
            height: 420px;
            border-radius: 24px;
            overflow: hidden;
            background: transparent;
        }

        .hero-visual__image {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }

        /* -- Stats Card -- */
        .stats-card {
            position: absolute;
            top: 32px;
            right: 32px;
            bottom: 32px;
            width: 280px;
            height: 356px;
            background: rgba(255, 255, 255, 0.75);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.5);
            border-radius: 20px;
            padding: 0 28px;
            z-index: 10;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
            display: flex;
            flex-direction: column;
        }

        .stats-card__header {
            padding-top: 32px;
        }

        .stats-card__footer {
            padding-bottom: 32px;
            margin-top: auto;
        }

        .stats-card__metric {
            display: flex;
            align-items: baseline;
            gap: 4px;
            margin-bottom: 8px;
        }

        .stats-card__value {
            font-size: 42px;
            font-weight: 800;
            color: #1A1A1A;
            line-height: 1;
            display: inline-block;
        }

        .stats-card__unit {
            font-size: 16px;
            font-weight: 600;
            color: #6B7280;
        }

        .stats-card__title {
            font-size: 15px;
            font-weight: 600;
            color: #374151;
            margin-bottom: 6px;
        }

        .stats-card__label {
            font-size: 13px;
            color: #9CA3AF;
            line-height: 1.5;
        }

        .stats-card__detail {
            font-size: 12px;
            color: #9CA3AF;
            line-height: 1.7;
        }

        /* -- Floating Tag -- */
        .floating-tag {
            position: absolute;
            bottom: 32px;
            left: 40px;
            display: flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid rgba(255, 255, 255, 0.4);
            padding: 10px 20px;
            border-radius: 24px;
            z-index: 10;
            font-size: 13px;
            color: #4B5563;
            font-weight: 500;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
        }

        .floating-tag__dot {
            width: 8px;
            height: 8px;
            background: linear-gradient(135deg, #A78BFA, #F9A8D4);
            border-radius: 50%;
        }

        /* ========== Animations ========== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(20px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }

        @keyframes blurReveal {
            from {
                opacity: 0;
                filter: blur(10px);
                transform: translateY(8px);
            }
            to {
                opacity: 1;
                filter: blur(0px);
                transform: translateY(0);
            }
        }

        @keyframes blurRevealSlow {
            0% {
                opacity: 0;
                filter: blur(16px);
                transform: translateY(12px);
            }
            60% {
                opacity: 0.7;
                filter: blur(4px);
                transform: translateY(2px);
            }
            100% {
                opacity: 1;
                filter: blur(0px);
                transform: translateY(0);
            }
        }

        .blur-reveal .char {
            display: inline-block;
            opacity: 0;
            animation: blurReveal 0.6s cubic-bezier(0.16, 1, 0.3, 1) both;
        }

        /* 第三屏慢速逐字动画 */
        .blur-reveal-slow .char {
            display: inline-block;
            opacity: 0;
            animation: blurRevealSlow 1s cubic-bezier(0.16, 1, 0.3, 1) both;
        }

        .blur-reveal-delay-1 { animation-delay: 0.1s; }
        .blur-reveal-delay-2 { animation-delay: 0.2s; }
        .blur-reveal-delay-3 { animation-delay: 0.3s; }
        .blur-reveal-delay-4 { animation-delay: 0.4s; }
        .blur-reveal-delay-5 { animation-delay: 0.5s; }

        .hero__tag { animation: fadeInUp 0.6s ease-out 0.1s both; }
        .hero__title { animation: fadeInUp 0.6s ease-out 0.2s both; }
        .hero__subtitle { animation: fadeInUp 0.6s ease-out 0.3s both; }
        .hero__description { animation: fadeInUp 0.6s ease-out 0.4s both; }
        .hero__features { animation: fadeInUp 0.6s ease-out 0.5s both; }
        .hero__action { animation: fadeInUp 0.6s ease-out 0.6s both; }
        .hero-visual__card { animation: fadeInUp 0.8s ease-out 0.5s both; }
        .stats-card { animation: fadeInUp 0.6s ease-out 0.8s both; }
        .floating-tag { animation: fadeInUp 0.6s ease-out 0.9s both; }

        /* ========== Scroll Animations ========== */
        .reveal {
            opacity: 0;
            transform: translateY(40px);
            transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                        transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .reveal.is-visible {
            opacity: 1;
            transform: translateY(0);
        }

        .reveal-delay-1 { transition-delay: 0.1s; }
        .reveal-delay-2 { transition-delay: 0.2s; }
        .reveal-delay-3 { transition-delay: 0.3s; }
        .reveal-delay-4 { transition-delay: 0.4s; }
        .reveal-delay-5 { transition-delay: 0.5s; }

        /* 视差滚动 - hero元素 */
        .parallax-slow {
            will-change: transform;
        }

        /* ========== Mobile Responsive ========== */
        @media (max-width: 768px) {
            /* 导航栏 */
            .site-nav {
                width: 100%;
                top: 0;
                border-radius: 0;
            }

            .site-nav__inner {
                width: 100%;
                padding: 0 16px;
            }

            .site-nav__brand img {
                max-height: 40px;
            }

            .site-nav__menu {
                display: none;
            }

            /* Hero */
            .hero {
                padding-top: 80px;
            }

            .hero__container {
                width: 100%;
                padding: 0 16px;
            }

            .hero__body {
                flex-direction: column;
                align-items: stretch;
                gap: 24px;
            }

            .hero__title {
                font-size: 36px;
                letter-spacing: 1px;
            }

            .hero__subtitle {
                font-size: 24px;
                letter-spacing: 1px;
            }

            .hero__info-group {
                padding-top: 0;
            }

            .hero__features {
                flex-direction: column;
                gap: 12px;
            }

            /* 视觉区 */
            .hero-visual {
                width: 100%;
                padding: 0 16px;
            }

            .hero-visual__card {
                height: 260px;
                border-radius: 16px;
            }

            /* 数据卡片 */
            .stats-card {
                top: 16px;
                right: 16px;
                bottom: 16px;
                width: 180px;
                height: auto;
                padding: 0 16px;
                border-radius: 14px;
            }

            .stats-card__header {
                padding-top: 16px;
            }

            .stats-card__footer {
                padding-bottom: 16px;
            }

            .stats-card__value {
                font-size: 28px;
            }

            .stats-card__title {
                font-size: 12px;
            }

            .stats-card__label {
                font-size: 11px;
            }

            .stats-card__detail {
                font-size: 10px;
            }

            /* 浮动标签 */
            .floating-tag {
                bottom: 16px;
                left: 16px;
                padding: 6px 14px;
                font-size: 11px;
                border-radius: 16px;
            }
        }

        /* ========== Pricing Section ========== */
        .pricing {
            position: relative;
            padding: 100px 0 0;
            background: transparent;
        }

        /* 背景圆环 */
        .pricing__bg-ring {
            position: absolute;
            top: 80px;
            left: 50%;
            transform: translateX(-50%);
            width: 100%;
            max-width: 1140px;
            z-index: 0;
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.6s ease;
        }

        .pricing__bg-ring.show {
            opacity: 1;
        }

        .pricing__bg-ring img {
            width: 100%;
            height: auto;
            display: block;
        }

        .pricing__container {
            position: sticky;
            top: 72px;
            z-index: 1;
            width: 1140px;
            margin: 0 auto;
        }

        /* -- Pricing Header -- */
        .pricing__header {
            display: flex;
            align-items: flex-end;
            justify-content: space-between;
            margin-bottom: 60px;
            position: relative;
        }

        /* 第二屏标题滚动变形：放大居中 → 缩小居左 */
        .pricing__header-left {
            flex: 1;
        }

        .pricing__title {
            font-size: 36px;
            font-weight: 700;
            color: #1A1A1A;
            margin-bottom: 12px;
            letter-spacing: 1px;
            text-align: left;
            transform-origin: left center;
        }

        .pricing__subtitle {
            font-size: 15px;
            color: #6B7280;
            line-height: 1.6;
            text-align: left;
            transform-origin: left center;
        }

        /* 初始状态：放大居中 */
        .pricing__header-left.is-scaling {
            width: 100%;
        }

        .pricing__header-left.is-scaling .pricing__title {
            font-size: 56px;
            text-align: center;
        }

        .pricing__header-left.is-scaling .pricing__subtitle {
            font-size: 22px;
            text-align: center;
        }

        .pricing__badges {
            display: flex;
            gap: 32px;
            flex-shrink: 0;
            position: absolute;
            right: 0;
            bottom: 0;
            opacity: 0;
            visibility: hidden;
            transition: opacity 0.5s ease, visibility 0.5s ease;
        }

        .pricing__badges.show {
            opacity: 1;
            visibility: visible;
        }

        .pricing__badge {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: #374151;
            font-weight: 500;
        }

        .pricing__badge img {
            width: 20px;
            height: 20px;
        }

        /* -- Pricing Cards Grid -- */
        .pricing__grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            opacity: 0;
            transition: opacity 0.5s ease;
        }

        .pricing__grid.show {
            opacity: 1;
        }

        /* -- Pricing Card -- */
        .pricing-card {
            position: relative;
            background: transparent;
            border-radius: 20px;
            box-shadow: none;
            overflow: visible;
            z-index: 1;
            transition: box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
            cursor: pointer;
            transform-style: preserve-3d;
            perspective: 800px;
        }

        /* 卡片白色背景（带底部弧度镂空） */
        .pricing-card__bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border-radius: 20px;
            background: #FFFFFF;
            -webkit-mask-image: radial-gradient(circle at 50% 100%, transparent 34px, black 34px);
            mask-image: radial-gradient(circle at 50% 100%, transparent 34px, black 34px);
            z-index: 0;
            transition: background 0.4s ease, box-shadow 0.4s ease;
            box-shadow: 0 10px 40px -10px rgba(0, 0, 0, 0.08);
        }

        .pricing-card:hover .pricing-card__bg {
            background: linear-gradient(135deg, #E4DFFF, #EAF2FF, #F4F8FF);
            box-shadow: 0 20px 60px -10px rgba(0, 0, 0, 0.15);
        }

        .pricing-card:hover {
            box-shadow: none;
        }

        .pricing-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            border-radius: 20px;
            background: radial-gradient(circle at var(--glare-x, 50%) var(--glare-y, 50%),
                rgba(255, 255, 255, 0.5) 0%,
                rgba(255, 255, 255, 0.08) 35%,
                transparent 60%);
            -webkit-mask-image: radial-gradient(circle at 50% 100%, transparent 34px, black 34px);
            mask-image: radial-gradient(circle at 50% 100%, transparent 34px, black 34px);
            opacity: 0;
            transition: opacity 0.3s ease;
            pointer-events: none;
            z-index: 10;
        }

        .pricing-card:hover::before {
            opacity: 1;
        }

        .pricing-card:hover .pricing-card__icon--default {
            display: none;
        }

        .pricing-card__icon--hover {
            display: none;
        }

        .pricing-card:hover .pricing-card__icon--hover {
            display: block;
        }

        .pricing-card__inner {
            padding: 40px 32px 60px;
            text-align: center;
            position: relative;
            z-index: 1;
        }

        .pricing-card__icon {
            width: 48px;
            height: 48px;
            margin: 0 auto 4px;
        }

        .pricing-card__name {
            font-size: 18px;
            font-weight: 600;
            color: #1A1A1A;
            margin-bottom: 4px;
        }

        .pricing-card__name-en {
            font-size: 11px;
            color: #9CA3AF;
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 24px;
        }

        .pricing-card__price {
            display: flex;
            align-items: flex-end;
            justify-content: center;
            gap: 4px;
            margin-bottom: 24px;
        }

        .pricing-card__currency {
            font-size: 13px;
            font-weight: 500;
            color: #9CA3AF;
            line-height: 1;
            margin-bottom: 4px;
        }

        .pricing-card__amount {
            font-size: 36px;
            font-weight: 800;
            color: #111827;
            line-height: 1;
        }

        .pricing-card__decimal {
            font-size: 24px;
            font-weight: 800;
            color: #111827;
            line-height: 1;
            vertical-align: baseline;
            margin-left: -2px;
        }

        .pricing-card__period {
            font-size: 13px;
            font-weight: 500;
            color: #9CA3AF;
            line-height: 1;
            margin-bottom: 4px;
        }

        /* 虚线分隔 */
        .pricing-card__divider {
            border: none;
            border-top: 1px dashed #E5E7EB;
            margin-top: 32px;
            margin-bottom: 24px;
        }

        /* 特性列表 */
        .pricing-card__features {
            list-style: none;
            text-align: left;
        }

        .pricing-card__feature {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 10px 0;
            font-size: 14px;
            color: #4B5563;
        }

        .pricing-card__feature-check {
            width: 16px;
            height: 16px;
            flex-shrink: 0;
        }

        /* 底部圆缺口 - 布尔运算 */
        .pricing-card__notch {
            position: absolute;
            bottom: -24px;
            left: 50%;
            transform: translateX(-50%);
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: #FFFFFF;
            z-index: 2;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: background 0.4s ease;
        }

        .pricing-card:hover .pricing-card__notch {
            background: #1F2937;
        }

        .pricing-card__notch img {
            width: 20px;
            height: 20px;
            transition: filter 0.4s ease;
        }

        .pricing-card:hover .pricing-card__notch img {
            filter: brightness(0) invert(1);
        }

        /* -- Global Infrastructure Section -- */
        .infrastructure {
            position: relative;
            padding: 140px 0 100px;
            background: transparent;
        }

        .infrastructure__container {
            width: 1140px;
            margin: 0 auto;
        }

        .infrastructure__card {
            width: 1140px;
            height: 576px;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 2px solid #FFFFFF;
            border-radius: 24px;
            padding: 48px 56px;
            display: flex;
            gap: 48px;
            align-items: stretch;
            overflow: hidden;
            position: relative;
            opacity: 0;
        }

        .infrastructure__card.is-visible {
            opacity: 1;
        }

        /* 左侧内容 */
        .infrastructure__left {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: center;
            opacity: 0;
        }

        .infrastructure__title-row {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 8px;
        }

        .infrastructure__title {
            font-size: 28px;
            font-weight: 800;
            color: #1A1A1A;
            letter-spacing: 1px;
        }

        .infrastructure__play-btn {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: #1A1A1A;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            flex-shrink: 0;
        }

        .infrastructure__play-btn img {
            width: 12px;
            height: 12px;
            margin-left: 2px;
            filter: brightness(0) invert(1);
        }

        .infrastructure__subtitle {
            font-size: 14px;
            color: #6B7280;
            line-height: 1.7;
            margin-bottom: 40px;
            max-width: 420px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        /* 统计列表 */
        .infrastructure__stats {
            display: flex;
            flex-direction: column;
            max-width: 420px;
        }

        .infrastructure__stat {
            display: flex;
            align-items: baseline;
            gap: 8px;
            padding: 14px 0;
            border-bottom: 1px dashed #E5E7EB;
            opacity: 0;
            transform: translateY(15px);
            transition: opacity 0.5s ease, transform 0.5s ease;
        }

        .infrastructure__stat.is-visible {
            opacity: 1;
            transform: translateY(0);
        }

        .infrastructure__stat:last-child {
            border-bottom: none;
        }

        .infrastructure__stat-value {
            font-size: 24px;
            font-weight: 800;
            color: #1A1A1A;
            white-space: nowrap;
        }

        .infrastructure__stat-unit {
            font-size: 14px;
            font-weight: 600;
            color: #6B7280;
        }

        .infrastructure__stat-label {
            font-size: 14px;
            color: #9CA3AF;
        }

        /* 右侧地球区域 */
        .infrastructure__right {
            position: absolute;
            bottom: 0;
            right: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: flex-end;
            justify-content: flex-end;
            pointer-events: none;
            opacity: 0;
        }

        .infrastructure__globe-img {
            height: 576px;
            width: auto;
            object-fit: contain;
            object-position: bottom right;
        }

        /* 服务器节点分布卡片 */
        .infra-node-card {
            position: absolute;
            right: 88px;
            bottom: 112px;
            width: 310px;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 2px solid #FFFFFF;
            border-radius: 16px;
            padding: 20px 24px;
            z-index: 5;
            opacity: 0;
            transform: translateY(20px) scale(0.95);
            transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                        transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
        }

        .infra-node-card__title {
            font-size: 15px;
            font-weight: 700;
            color: #1A1A1A;
            margin-bottom: 2px;
        }

        .infra-node-card__subtitle {
            font-size: 11px;
            font-weight: 600;
            color: #9CA3AF;
            letter-spacing: 1px;
            margin-bottom: 16px;
        }

        .infra-node-card__row {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 12px;
        }

        .infra-node-card__row:last-child {
            margin-bottom: 0;
        }

        .infra-node-card__label {
            font-size: 13px;
            color: #6B7280;
            width: 48px;
            flex-shrink: 0;
        }

        .infra-node-card__bar-track {
            flex: 1;
            height: 8px;
            background: rgba(255, 255, 255, 0.3);
            border-radius: 4px;
            overflow: hidden;
        }

        .infra-node-card__bar-fill {
            height: 100%;
            border-radius: 4px;
            background: linear-gradient(90deg, #E5B5F7, #ACC1FF, #AEE4FF);
            transition: width 1.5s cubic-bezier(0.16, 1, 0.3, 1);
            width: 0;
        }

        .infra-node-card__bar-fill.is-visible {
            /* width set inline */
        }

        .infra-node-card__value {
            font-size: 14px;
            font-weight: 700;
            color: #1A1A1A;
            width: 36px;
            text-align: right;
            flex-shrink: 0;
        }

        /* Mobile Infrastructure */
        @media (max-width: 768px) {
            .infrastructure__card {
                flex-direction: column;
                height: auto;
                padding: 32px 24px;
            }
            .infrastructure__right {
                display: none;
            }
        }

        /* Mobile Pricing */
        @media (max-width: 768px) {
            .pricing {
                padding: 40px 0 100px;
            }

            .pricing__bg-ring {
                top: 40px;
            }

            .pricing__container {
                width: 100%;
                padding: 0 16px;
            }

            .pricing__title {
                font-size: 24px;
            }

            .pricing__badges {
                flex-direction: column;
                align-items: center;
                gap: 12px;
            }

            .pricing__grid {
                grid-template-columns: 1fr;
                gap: 80px;
            }

            .pricing-card__inner {
                padding: 32px 20px 50px;
            }

            .pricing-card__price {
                font-size: 28px;
            }
        }

        /* ========== 第四屏 - 用户评价 ========== */
        .reviews {
            position: relative;
            padding: 100px 0 80px;
            background: transparent;
        }

        .reviews__container {
            width: 1140px;
            margin: 0 auto;
            position: relative;
            z-index: 2;
        }

        .reviews__header {
            text-align: center;
            margin-bottom: 64px;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

        .reviews__header.is-visible {
            opacity: 1;
            transform: translateY(0);
        }

        .reviews__title {
            font-size: 36px;
            font-weight: 800;
            color: #111827;
            margin-bottom: 8px;
        }

        .reviews__subtitle {
            font-size: 15px;
            color: #6B7280;
        }

        .reviews__grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .review-card {
            width: 100%;
            background: rgba(255, 255, 255, 0.2);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 2px solid rgba(255, 255, 255, 0.6);
            border-radius: 8px;
            padding: 24px 24px 16px;
            display: flex;
            flex-direction: column;
            align-items: flex-start;
            opacity: 0;
            transform: translateY(40px) scale(0.95);
            transition: opacity 0.5s ease, transform 0.5s ease;
            position: relative;
        }

        .review-card:nth-child(1) { transition-delay: 0s; }
        .review-card:nth-child(2) { transition-delay: 0.08s; }
        .review-card:nth-child(3) { transition-delay: 0.16s; }
        .review-card:nth-child(4) { transition-delay: 0.24s; }
        .review-card:nth-child(5) { transition-delay: 0.32s; }
        .review-card:nth-child(6) { transition-delay: 0.40s; }
        .review-card:nth-child(7) { transition-delay: 0.48s; }
        .review-card:nth-child(8) { transition-delay: 0.56s; }

        .review-card.is-visible {
            opacity: 1;
            transform: translateY(0) scale(1);
        }

        .review-card.is-visible:hover {
            transform: translateY(-6px) scale(1.02);
            box-shadow: 0 12px 32px -8px rgba(0, 0, 0, 0.15);
            border-color: rgba(255, 255, 255, 0.8);
        }

        /* 滚动进度条 */
        .scroll-progress {
            position: fixed;
            top: 0;
            left: 0;
            width: 0%;
            height: 3px;
            background: linear-gradient(90deg, #6366F1, #8B5CF6);
            z-index: 9999;
            transition: width 0.1s linear;
            pointer-events: none;
        }

        .review-card:hover {
            background: rgba(255, 255, 255, 0.35);
            box-shadow: 0 12px 40px -8px rgba(0, 0, 0, 0.1);
        }

        .review-card__avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            margin-bottom: 12px;
        }

        .review-card__text {
            font-size: 13px;
            color: #4B5563;
            line-height: 1.6;
            text-align: left;
            margin-bottom: 12px;
        }

        .review-card__stars {
            display: flex;
            gap: 2px;
            margin-bottom: 12px;
        }

        .review-card__stars img {
            width: 14px;
            height: 14px;
        }

        .review-card__divider {
            width: 100%;
            height: 0;
            border-top: 1px dashed rgba(0, 0, 0, 0.2);
            margin-bottom: 16px;
        }

        .review-card__company {
            font-size: 11px;
            color: #9CA3AF;
            letter-spacing: 0.5px;
        }

        .review-card__ring {
            width: 48px;
            height: 48px;
            object-fit: contain;
            opacity: 0.4;
        }

        .reviews__bg-ring {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, calc(-50% + 60px));
            width: 100%;
            max-width: 1200px;
            z-index: -1;
            pointer-events: none;
            opacity: 0;
            transition: opacity 1s ease;
        }

        .reviews__bg-ring.is-visible {
            opacity: 0.3;
        }

        .reviews__bg-ring img {
            width: 100%;
            height: auto;
        }

        /* ========== CTA 区域 ========== */
        .cta-section {
            padding: 80px 0;
            background: transparent;
        }

        .cta-card {
            width: 1140px;
            max-width: 100%;
            margin: 0 auto;
            background: #4A4D50;
            border-radius: 12px;
            padding: 64px 48px;
            text-align: center;
            opacity: 0;
            transform: translateY(30px);
            transition: opacity 0.8s ease, transform 0.8s ease;
        }

        .cta-card.is-visible {
            opacity: 1;
            transform: translateY(0);
        }

        .cta-card__title {
            font-size: 28px;
            font-weight: 800;
            color: #FFFFFF;
            margin-bottom: 16px;
        }

        .cta-card__desc {
            font-size: 14px;
            color: #B0B3B8;
            line-height: 1.6;
            margin-bottom: 36px;
        }

        .cta-card__form {
            display: flex;
            align-items: center;
            max-width: 520px;
            margin: 0 auto;
            background: #FFFFFF;
            border-radius: 28px;
            padding: 4px 4px 4px 20px;
        }

        .cta-card__input {
            flex: 1;
            border: none;
            outline: none;
            font-size: 14px;
            color: #333333;
            background: transparent;
        }

        .cta-card__input::placeholder {
            color: #999999;
        }

        .cta-card__submit {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: #333333;
            border: none;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: background 0.2s ease;
        }

        .cta-card__submit:hover {
            background: #111111;
        }

        .cta-card__submit img {
            width: 18px;
            height: 18px;
            filter: brightness(0) invert(1);
        }

        /* ========== 第五屏 - Footer ========== */
        .site-footer {
            position: relative;
            background: #494A4B;
            padding: 48px 0 0;
        }

        .footer__main {
            width: 1140px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr 1.2fr auto;
            gap: 32px;
        }

        .footer__col-title {
            font-size: 14px;
            font-weight: 600;
            color: #FFFFFF;
            margin-bottom: 16px;
        }

        .footer__col-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer__col-list a {
            font-size: 13px;
            color: #B0B0B0;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .footer__col-list a:hover {
            color: #FFFFFF;
        }

        /* 联系列 */
        .footer__contact-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer__contact-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: #B0B0B0;
        }

        .footer__contact-item img {
            width: 14px;
            height: 14px;
            opacity: 0.7;
        }

        /* 二维码 */
        .footer__qr {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
        }

        .footer__qr-box {
            width: 100px;
            height: 100px;
            background: #FFFFFF;
            border-radius: 4px;
        }

        .footer__qr-text {
            font-size: 11px;
            color: #999999;
            text-align: center;
            line-height: 1.4;
        }

        /* 底部栏 */
        .footer__bottom-bar {
            width: 1140px;
            margin: 32px auto 0;
            padding: 16px 0;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .footer__bottom-bar span {
            font-size: 12px;
            color: #999999;
        }

        .footer__bottom-bar a {
            font-size: 12px;
            color: #999999;
            text-decoration: none;
            transition: color 0.2s ease;
        }

        .footer__bottom-bar a:hover {
            color: #FFFFFF;
        }

        .footer__bottom-bar .sep {
            color: #666666;
            user-select: none;
        }