:root {
            --eu06b-primary: #007aff;
            --eu06b-primary-dark: #0056b3;
            --eu06b-accent: #00d2ff;
            --eu06b-bg: #f8fafc;
            --eu06b-text: #1d1d1f;
            --eu06b-text-light: #6e6e73;
            --eu06b-white: #ffffff;
            --eu06b-card-shadow: 0 10px 30px rgba(0,0,0,0.05);
            --eu06b-max-width: 1400px;
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--eu06b-bg);
            color: var(--eu06b-text);
            line-height: 1.6;
            overflow-x: hidden;
            word-break: break-word;
        }

        /* 导航栏设计：悬浮岛屿风格 */
        .eu06b-nav-wrapper {
            position: fixed;
            top: 24px;
            left: 0;
            width: 100%;
            z-index: 1000;
            display: flex;
            justify-content: center;
            padding: 0 24px;
        }

        .eu06b-nav-container {
            background: rgba(255, 255, 255, 0.8);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.3);
            border-radius: 40px;
            padding: 12px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: var(--eu06b-max-width);
            width: 100%;
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
            flex-wrap: wrap;
        }

        .eu06b-logo {
            display: flex;
            align-items: center;
            min-width: 0;
        }

        .eu06b-logo img {
            height: 32px;
            width: auto;
        }

        .eu06b-menu {
            display: flex;
            list-style: none;
            gap: 16px;
            flex-wrap: wrap;
            min-width: 0;
        }

        .eu06b-menu li {
            min-width: 0;
        }

        .eu06b-menu a {
            text-decoration: none;
            color: var(--eu06b-text-light);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.3s;
            padding: 8px 12px;
            border-radius: 20px;
            white-space: nowrap;
        }

        .eu06b-menu a:hover {
            color: var(--eu06b-primary);
        }

        .eu06b-menu a.active {
            color: var(--eu06b-white);
            background: var(--eu06b-primary);
        }

        /* Hero 区：非对称动态布局 */
        .eu06b-hero {
            padding: 180px 24px 80px;
            display: flex;
            flex-wrap: wrap;
            max-width: var(--eu06b-max-width);
            margin: 0 auto;
            align-items: center;
            min-height: 70vh;
        }

        .eu06b-hero-content {
            flex: 1;
            min-width: 320px;
            padding-right: 48px;
        }

        .eu06b-hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(0, 122, 255, 0.1);
            color: var(--eu06b-primary);
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 24px;
        }

        .eu06b-hero-title {
            font-size: clamp(2.5rem, 5vw + 1rem, 4.5rem);
            line-height: 1.1;
            font-weight: 800;
            margin-bottom: 24px;
            letter-spacing: -0.02em;
            word-break: keep-all;
        }

        .eu06b-hero-subtitle {
            font-size: clamp(1.1rem, 2vw + 0.5rem, 1.4rem);
            color: var(--eu06b-text-light);
            max-width: 600px;
            margin-bottom: 40px;
        }

        /* 下载入口区块：卡片网格布局 */
        .eu06b-download-grid {
            padding: 64px 24px;
            max-width: var(--eu06b-max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: 32px;
        }

        .eu06b-download-card {
            background: var(--eu06b-white);
            border-radius: 24px;
            overflow: hidden;
            box-shadow: var(--eu06b-card-shadow);
            transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            display: flex;
            flex-direction: column;
            min-width: 0;
            position: relative;
        }

        .eu06b-download-card:hover {
            transform: translateY(-12px);
        }

        .eu06b-card-image {
            height: 240px;
            width: 100%;
            overflow: hidden;
        }

        .eu06b-card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }

        .eu06b-download-card:hover .eu06b-card-image img {
            transform: scale(1.05);
        }

        .eu06b-card-body {
            padding: 32px;
            flex-grow: 1;
            display: flex;
            flex-direction: column;
        }

        .eu06b-card-tag {
            font-size: 12px;
            text-transform: uppercase;
            color: var(--eu06b-primary);
            font-weight: 700;
            margin-bottom: 12px;
            display: block;
        }

        .eu06b-card-title {
            font-size: 24px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .eu06b-download-btn {
            margin-top: auto;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 16px 32px;
            background: var(--eu06b-primary);
            color: var(--eu06b-white);
            text-decoration: none;
            border-radius: 12px;
            font-weight: 600;
            transition: background 0.3s;
        }

        .eu06b-download-btn:hover {
            background: var(--eu06b-primary-dark);
        }

        /* 协议执行矩阵：深色科技感区块 */
        .eu06b-protocol-section {
            background: #05192d;
            color: var(--eu06b-white);
            padding: 96px 24px;
            margin: 64px 0;
            border-radius: 0;
        }

        .eu06b-section-inner {
            max-width: var(--eu06b-max-width);
            margin: 0 auto;
        }

        .eu06b-protocol-header {
            text-align: center;
            margin-bottom: 64px;
        }

        .eu06b-protocol-header h2 {
            font-size: clamp(2rem, 3vw, 3rem);
            margin-bottom: 16px;
        }

        .eu06b-matrix-container {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            justify-content: center;
        }

        .eu06b-matrix-item {
            flex: 1;
            min-width: 300px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            padding: 40px;
            border-radius: 20px;
            transition: background 0.3s;
        }

        .eu06b-matrix-item:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .eu06b-standard-label {
            color: var(--eu06b-accent);
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 8px;
            display: block;
        }

        .eu06b-capability {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .eu06b-protocol-desc {
            color: #a0aec0;
            font-size: 15px;
            line-height: 1.8;
        }

        /* 用户画像：极简线条设计 */
        .eu06b-archetype-section {
            padding: 96px 24px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .eu06b-archetype-item {
            display: flex;
            flex-wrap: wrap;
            margin-bottom: 64px;
            align-items: flex-start;
            gap: 40px;
        }

        .eu06b-archetype-content {
            flex: 1;
            min-width: 300px;
        }

        .eu06b-archetype-persona {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 20px;
            color: var(--eu06b-primary);
        }

        .eu06b-archetype-usecase {
            font-size: 18px;
            margin-bottom: 24px;
            color: var(--eu06b-text);
            font-weight: 500;
        }

        .eu06b-feature-chip {
            display: inline-flex;
            align-items: center;
            padding: 10px 20px;
            background: var(--eu06b-white);
            border: 1px solid #e2e8f0;
            border-radius: 12px;
            font-size: 14px;
            font-weight: 600;
        }

        /* 页脚 */
        .eu06b-footer {
            background: var(--eu06b-white);
            padding: 80px 24px 40px;
            border-top: 1px solid #edf2f7;
        }

        .eu06b-footer-grid {
            max-width: var(--eu06b-max-width);
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 48px;
        }

        .eu06b-footer-brand {
            flex: 1;
            min-width: 280px;
        }

        .eu06b-footer-brand h3 {
            font-size: 24px;
            margin-bottom: 16px;
            color: var(--eu06b-primary);
        }

        .eu06b-footer-links {
            display: flex;
            flex-wrap: wrap;
            gap: 64px;
        }

        .eu06b-link-group h4 {
            margin-bottom: 24px;
            font-size: 16px;
        }

        .eu06b-link-group ul {
            list-style: none;
        }

        .eu06b-link-group li {
            margin-bottom: 12px;
        }

        .eu06b-link-group a {
            text-decoration: none;
            color: var(--eu06b-text-light);
            font-size: 14px;
            transition: color 0.3s;
        }

        .eu06b-link-group a:hover {
            color: var(--eu06b-primary);
        }

        .eu06b-copyright {
            max-width: var(--eu06b-max-width);
            margin: 64px auto 0;
            padding-top: 32px;
            border-top: 1px solid #edf2f7;
            text-align: center;
            color: var(--eu06b-text-light);
            font-size: 14px;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .eu06b-hero-content {
                padding-right: 0;
                text-align: center;
            }
            .eu06b-hero-subtitle {
                margin-left: auto;
                margin-right: auto;
            }
        }

        @media (max-width: 768px) {
            .eu06b-nav-container {
                padding: 12px 16px;
                justify-content: center;
                border-radius: 20px;
            }
            .eu06b-menu {
                justify-content: center;
                margin-top: 12px;
                gap: 8px;
            }
            .eu06b-hero {
                padding-top: 220px;
            }
            .eu06b-download-grid {
                grid-template-columns: 1fr;
            }
            .eu06b-matrix-item {
                padding: 24px;
            }
        }