:root {
            --pcI-primary: #D42E2D;
            --pcI-primary-dark: #B02524;
            --pcI-accent: #1A73E8;
            --pcI-bg: #ffffff;
            --pcI-text: #1d1d1f;
            --pcI-text-light: #6e6e73;
            --pcI-gray-bg: #f5f5f7;
            --pcI-space-base: 8px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Myriad Set Pro", "SF Pro Icons", "PingFang SC", "Helvetica Neue", Helvetica, Arial, sans-serif;
            background-color: var(--pcI-bg);
            color: var(--pcI-text);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: keep-all;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: all 0.3s ease;
        }

        /* 布局容器 */
        .pcI-shell {
            width: 100%;
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .pcI-vault {
            display: flex;
            flex-wrap: wrap;
            width: 100%;
            min-width: 0;
        }

        /* 导航区域 - ribn, pivto */
        .pcI-ribn {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            height: 64px;
        }

        .pcI-ribn .pcI-shell {
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }

        .pcI-logo img {
            height: 32px;
            width: auto;
            display: block;
        }

        .pcI-pivto {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 32px;
            min-width: 0;
        }

        .pcI-pivto a {
            font-size: 14px;
            font-weight: 500;
            color: var(--pcI-text);
            opacity: 0.8;
        }

        .pcI-pivto a:hover {
            opacity: 1;
            color: var(--pcI-primary);
        }

        .pcI-pivto a.pcI-active {
            opacity: 1;
            color: var(--pcI-primary);
            font-weight: 600;
        }

        /* 展示区域 - vsta, facade, halo */
        .pcI-vsta {
            position: relative;
            padding: 96px 0;
            overflow: hidden;
            background: #000;
            min-height: 85vh;
            display: flex;
            align-items: center;
        }

        .pcI-vsta-bg {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.6;
        }

        .pcI-facade {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }

        .pcI-halo {
            font-size: clamp(2.5rem, 5vw + 1rem, 5rem);
            line-height: 1.1;
            font-weight: 700;
            color: #fff;
            margin-bottom: 24px;
            word-break: break-word;
        }

        .pcI-vsta-sub {
            font-size: clamp(1.1rem, 1vw + 0.8rem, 1.5rem);
            color: rgba(255,255,255,0.8);
            margin-bottom: 48px;
            max-width: 600px;
            word-break: break-word;
        }

        /* 按钮组件 - trig, flux */
        .pcI-trig {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 40px;
            background: var(--pcI-primary);
            color: #fff;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            border: none;
            transition: transform 0.2s, background 0.3s;
        }

        .pcI-trig:hover {
            background: var(--pcI-primary-dark);
            transform: scale(1.05);
        }

        .pcI-flux {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 40px;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(10px);
            color: #fff;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 600;
            margin-left: 16px;
            border: 1px solid rgba(255,255,255,0.3);
        }

        .pcI-flux:hover {
            background: rgba(255,255,255,0.25);
        }

        /* 内容区块通用容器 */
        .pcI-core {
            padding: 96px 0;
            width: 100%;
        }

        .pcI-core-title {
            font-size: clamp(2rem, 3vw + 0.5rem, 3rem);
            text-align: center;
            margin-bottom: 64px;
            font-weight: 700;
        }

        /* 卡片组件 - folio, cell */
        .pcI-folio-wrap {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            min-width: 0;
        }

        .pcI-folio {
            flex: 1;
            min-width: 300px;
            background: var(--pcI-gray-bg);
            border-radius: 24px;
            padding: 48px;
            display: flex;
            flex-direction: column;
            transition: all 0.3s ease;
        }

        .pcI-folio:hover {
            transform: translateY(-10px);
            box-shadow: 0 20px 40px rgba(0,0,0,0.05);
        }

        .pcI-folio img {
            width: 100%;
            height: auto;
            border-radius: 16px;
            margin-bottom: 32px;
            object-fit: cover;
        }

        .pcI-cell-title {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 16px;
        }

        .pcI-cell-desc {
            font-size: 16px;
            color: var(--pcI-text-light);
            line-height: 1.8;
            margin-bottom: 24px;
        }

        /* 图文交替布局 */
        .pcI-vault-mixed {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 64px;
            margin-bottom: 96px;
        }

        .pcI-vault-mixed > div {
            flex: 1;
            min-width: 340px;
        }

        .pcI-vault-mixed.reverse {
            flex-direction: row-reverse;
        }

        .pcI-img-vault {
            border-radius: 32px;
            overflow: hidden;
            box-shadow: 0 30px 60px rgba(0,0,0,0.1);
        }

        .pcI-img-vault img {
            width: 100%;
            display: block;
            transition: transform 0.5s ease;
        }

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

        /* FAQ模块 */
        .pcI-faq {
            background: #fff;
            padding: 96px 0;
        }

        .pcI-faq-item {
            border-bottom: 1px solid #e5e5e5;
            padding: 32px 0;
        }

        .pcI-faq-item h3 {
            font-size: 20px;
            margin-bottom: 16px;
            color: var(--pcI-text);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .pcI-faq-item p {
            font-size: 16px;
            color: var(--pcI-text-light);
            line-height: 1.8;
        }

        /* 页脚区域 - basin, floor */
        .pcI-basin {
            background: var(--pcI-gray-bg);
            padding: 80px 0 40px;
            border-top: 1px solid #e5e5e5;
        }

        .pcI-basin-vault {
            display: flex;
            flex-wrap: wrap;
            gap: 48px;
            margin-bottom: 64px;
        }

        .pcI-basin-col {
            flex: 1;
            min-width: 200px;
        }

        .pcI-basin-col h4 {
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 24px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .pcI-basin-col ul {
            list-style: none;
        }

        .pcI-basin-col li {
            margin-bottom: 12px;
        }

        .pcI-basin-col a {
            font-size: 14px;
            color: var(--pcI-text-light);
        }

        .pcI-basin-col a:hover {
            color: var(--pcI-primary);
        }

        .pcI-floor {
            border-top: 1px solid #d2d2d7;
            padding-top: 32px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 12px;
            color: var(--pcI-text-light);
        }

        .pcI-brand-text {
            font-weight: 700;
            font-size: 16px;
            color: var(--pcI-text);
            margin-bottom: 16px;
        }

        /* 响应式断点 */
        @media (max-width: 768px) {
            .pcI-pivto {
                display: none; /* 简化移动端展示 */
            }
            .pcI-vault-mixed {
                gap: 32px;
            }
            .pcI-halo {
                font-size: 3rem;
            }
            .pcI-flux {
                margin-left: 0;
                margin-top: 16px;
                width: 100%;
            }
            .pcI-trig {
                width: 100%;
            }
            .pcI-basin-col {
                min-width: 140px;
            }
        }

        /* 首页内容深度文本样式 */
        .pcI-text-block {
            font-size: 17px;
            line-height: 1.8;
            color: var(--pcI-text-light);
            margin-bottom: 32px;
            max-width: 800px;
        }

        .pcI-tag {
            display: inline-block;
            padding: 4px 12px;
            background: rgba(212, 46, 45, 0.1);
            color: var(--pcI-primary);
            border-radius: 4px;
            font-size: 12px;
            font-weight: 700;
            margin-bottom: 16px;
        }