* { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif; background: #0b0e1a; color: #e8edf5; line-height: 1.6; }
        a { color: #7cb8ff; text-decoration: none; }
        a:hover { color: #a8d0ff; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

        .header { display: flex; align-items: center; justify-content: space-between; padding: 18px 0; border-bottom: 1px solid rgba(124, 184, 255, 0.12); flex-wrap: wrap; gap: 12px; }
        .logo { display: flex; align-items: center; gap: 10px; font-size: 22px; font-weight: 700; letter-spacing: 0.5px; color: #fff; }
        .logo svg { width: 36px; height: 36px; flex-shrink: 0; }
        .logo .version-tag { background: linear-gradient(135deg, #4a9eff, #7cb8ff); padding: 2px 12px; border-radius: 20px; font-size: 14px; font-weight: 500; color: #0b0e1a; }
        .nav { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
        .nav a { color: #b0c8e8; font-size: 14px; font-weight: 500; transition: color 0.2s; position: relative; white-space: nowrap; }
        .nav a:hover { color: #fff; }
        .nav a.active { color: #fff; }
        .nav a.active::after { content: ''; position: absolute; bottom: -4px; left: 0; width: 100%; height: 2px; background: #4a9eff; border-radius: 4px; }
        .btn-outline { border: 1px solid rgba(124, 184, 255, 0.35); padding: 8px 16px; border-radius: 30px; font-size: 13px; font-weight: 500; color: #7cb8ff; transition: all 0.25s; background: transparent; }
        .btn-outline:hover { background: rgba(74, 158, 255, 0.12); border-color: #4a9eff; color: #fff; }

        .banner { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; padding: 56px 0 48px; align-items: center; }
        .banner-content h1 { font-size: 42px; font-weight: 800; line-height: 1.2; letter-spacing: -0.5px; margin-bottom: 16px; background: linear-gradient(135deg, #ffffff 40%, #7cb8ff); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .banner-content .sub { font-size: 18px; color: #b0c8e8; margin-bottom: 8px; font-weight: 400; }
        .banner-content .desc { font-size: 16px; color: #8aa4c8; max-width: 520px; margin: 12px 0 24px; line-height: 1.7; }
        .banner-content .desc strong { color: #7cb8ff; font-weight: 600; }
        .banner-badge { display: inline-flex; align-items: center; gap: 8px; background: rgba(74, 158, 255, 0.10); border: 1px solid rgba(74, 158, 255, 0.20); padding: 6px 18px 6px 14px; border-radius: 40px; font-size: 14px; color: #7cb8ff; margin-bottom: 18px; }
        .banner-badge .dot { width: 8px; height: 8px; background: #4a9eff; border-radius: 50%; display: inline-block; animation: pulse-dot 1.8s infinite; }
        @keyframes pulse-dot { 0%, 100% { opacity: 1; transform: scale(1); } 50% { opacity: 0.4; transform: scale(0.8); } }
        .btn-primary { display: inline-block; background: linear-gradient(135deg, #4a9eff, #2d7cdb); padding: 14px 42px; border-radius: 40px; font-weight: 600; font-size: 16px; color: #fff; border: none; cursor: pointer; transition: transform 0.2s, box-shadow 0.2s; box-shadow: 0 8px 28px rgba(74, 158, 255, 0.30); }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 36px rgba(74, 158, 255, 0.40); color: #fff; }
        .banner-image { display: flex; align-items: center; justify-content: center; position: relative; overflow: hidden; }
        .banner-image img { width: 550px; height: auto; object-fit: contain; border-radius: 12px; display: block; background: #0f1428; transition: opacity 0.4s; }
        .banner-image .placeholder-label { position: absolute; bottom: 18px; right: 24px; font-size: 12px; color: rgba(124, 184, 255, 0.25); letter-spacing: 0.5px; background: rgba(11, 14, 26, 0.70); padding: 4px 14px; border-radius: 20px; border: 1px solid rgba(124, 184, 255, 0.06); }

        .stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; padding: 32px 0 48px; border-top: 1px solid rgba(124, 184, 255, 0.06); border-bottom: 1px solid rgba(124, 184, 255, 0.06); }
        .stat-item { text-align: center; padding: 12px 8px; }
        .stat-item .number { font-size: 36px; font-weight: 800; color: #fff; letter-spacing: -0.5px; }
        .stat-item .number span { color: #4a9eff; }
        .stat-item .label { font-size: 14px; color: #8aa4c8; margin-top: 4px; font-weight: 400; }
        .stat-item .label small { display: block; font-size: 12px; color: #5a7a9a; margin-top: 2px; }

        .section { padding: 56px 0 40px; }
        .section-title { font-size: 32px; font-weight: 700; text-align: center; margin-bottom: 10px; letter-spacing: -0.3px; color: #fff; }
        .section-sub { text-align: center; color: #8aa4c8; font-size: 17px; max-width: 640px; margin: 0 auto 40px; line-height: 1.7; }
        .section-sub strong { color: #7cb8ff; font-weight: 600; }

        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .feature-card { background: rgba(20, 26, 46, 0.70); border-radius: 20px; padding: 30px 26px 28px; border: 1px solid rgba(124, 184, 255, 0.07); transition: border-color 0.25s, transform 0.25s; }
        .feature-card:hover { border-color: rgba(74, 158, 255, 0.20); transform: translateY(-4px); }
        .feature-card .icon { font-size: 34px; margin-bottom: 14px; display: block; }
        .feature-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 8px; color: #fff; }
        .feature-card p { color: #9ab0d0; font-size: 15px; line-height: 1.7; }
        .feature-card .tag { display: inline-block; margin-top: 14px; font-size: 13px; color: #4a9eff; background: rgba(74, 158, 255, 0.08); padding: 2px 16px; border-radius: 30px; border: 1px solid rgba(74, 158, 255, 0.12); }

        .advantages-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
        .adv-item { background: rgba(20, 26, 46, 0.50); border-radius: 18px; padding: 26px 28px; border-left: 4px solid #4a9eff; border: 1px solid rgba(124, 184, 255, 0.06); border-left-width: 4px; }
        .adv-item h4 { font-size: 19px; font-weight: 600; color: #fff; margin-bottom: 6px; }
        .adv-item p { color: #9ab0d0; font-size: 15px; line-height: 1.7; }
        .adv-item .meta { font-size: 13px; color: #5a7a9a; margin-top: 10px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
        .adv-item .meta span { background: rgba(74, 158, 255, 0.06); padding: 2px 14px; border-radius: 30px; border: 1px solid rgba(74, 158, 255, 0.06); }

        .scenarios-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .scenario-card { background: rgba(20, 26, 46, 0.50); border-radius: 18px; padding: 26px 24px 24px; border: 1px solid rgba(124, 184, 255, 0.06); text-align: center; transition: border-color 0.2s; }
        .scenario-card:hover { border-color: rgba(74, 158, 255, 0.18); }
        .scenario-card .emoji { font-size: 40px; margin-bottom: 12px; display: block; }
        .scenario-card h4 { font-size: 18px; font-weight: 600; color: #fff; margin-bottom: 6px; }
        .scenario-card p { color: #9ab0d0; font-size: 14px; line-height: 1.7; }
        .scenario-card .badge { display: inline-block; margin-top: 12px; font-size: 12px; color: #7cb8ff; background: rgba(74, 158, 255, 0.06); padding: 2px 16px; border-radius: 30px; border: 1px solid rgba(74, 158, 255, 0.06); }

        .why-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 20px; }
        .why-item { background: rgba(20, 26, 46, 0.40); border-radius: 16px; padding: 20px 18px; border: 1px solid rgba(124, 184, 255, 0.04); text-align: center; transition: background 0.2s; }
        .why-item:hover { background: rgba(74, 158, 255, 0.06); }
        .why-item .icon { font-size: 30px; margin-bottom: 10px; }
        .why-item h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 6px; }
        .why-item p { color: #8aa4c8; font-size: 13px; line-height: 1.6; }

        .node-regions { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-top: 20px; }
        .node-region { background: rgba(20, 26, 46, 0.45); border-radius: 12px; padding: 16px 12px; text-align: center; border: 1px solid rgba(124, 184, 255, 0.05); }
        .node-region .count { font-size: 24px; font-weight: 700; color: #7cb8ff; }
        .node-region .name { font-size: 12px; color: #8aa4c8; margin-top: 4px; }

        .nav-highlight-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 10px; }
        .nav-highlight-item { background: rgba(20, 26, 46, 0.55); border-radius: 16px; padding: 22px 18px; border: 1px solid rgba(124, 184, 255, 0.08); transition: all 0.2s; text-align: center; }
        .nav-highlight-item:hover { border-color: rgba(74, 158, 255, 0.25); background: rgba(74, 158, 255, 0.06); transform: translateY(-3px); }
        .nav-highlight-item .icon { font-size: 32px; margin-bottom: 10px; }
        .nav-highlight-item h4 { font-size: 17px; color: #fff; margin-bottom: 6px; font-weight: 600; }
        .nav-highlight-item p { font-size: 13px; color: #9ab0d0; line-height: 1.5; }
        .nav-highlight-item .link-more { display: inline-block; margin-top: 10px; font-size: 13px; color: #4a9eff; font-weight: 500; }
        .quick-links { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 20px; }
        .quick-link-btn { background: rgba(74, 158, 255, 0.08); border: 1px solid rgba(74, 158, 255, 0.15); padding: 8px 20px; border-radius: 30px; color: #7cb8ff; font-size: 14px; transition: all 0.2s; }
        .quick-link-btn:hover { background: rgba(74, 158, 255, 0.15); color: #fff; }

        /* Footer 样式 */
        .footer { border-top: 1px solid rgba(124, 184, 255, 0.06); padding: 44px 0 32px; margin-top: 24px; }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; }
        .footer-brand .logo { font-size: 20px; margin-bottom: 12px; display: flex; align-items: center; gap: 10px; }
        .footer-brand .logo svg { width: 30px; height: 30px; flex-shrink: 0; }
        .footer-brand p { color: #8aa4c8; font-size: 14px; max-width: 280px; line-height: 1.7; }
        .footer-brand .version-tag { display: inline-block; margin-top: 12px; background: rgba(74, 158, 255, 0.08); padding: 4px 18px; border-radius: 30px; font-size: 13px; color: #7cb8ff; border: 1px solid rgba(74, 158, 255, 0.10); }
        .footer-col h5 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 14px; }
        .footer-col ul { list-style: none; padding: 0; }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a { color: #8aa4c8; font-size: 14px; transition: color 0.2s; }
        .footer-col ul li a:hover { color: #fff; }
        .footer-col .contact-item { color: #8aa4c8; font-size: 14px; margin-bottom: 6px; }
        .footer-col .contact-item strong { color: #b0c8e8; font-weight: 500; }
        .footer-bottom { border-top: 1px solid rgba(124, 184, 255, 0.05); margin-top: 32px; padding-top: 24px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; color: #5a7a9a; }
        .footer-bottom .info span { margin-right: 20px; }
        .footer-bottom .info .highlight { color: #7cb8ff; }

        /* 响应式 */
        @media (max-width: 992px) {
            .banner { grid-template-columns: 1fr; gap: 28px; padding: 36px 0 32px; }
            .banner-content h1 { font-size: 34px; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .advantages-grid { grid-template-columns: 1fr; }
            .scenarios-grid { grid-template-columns: repeat(2, 1fr); }
            .why-grid { grid-template-columns: repeat(2, 1fr); }
            .node-regions { grid-template-columns: repeat(3, 1fr); }
            .nav-highlight-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .stats { grid-template-columns: repeat(2, 1fr); gap: 8px; }
        }
        @media (max-width: 640px) {
            .header { flex-direction: column; align-items: stretch; gap: 12px; }
            .nav { justify-content: center; gap: 12px; flex-wrap: wrap; }
            .nav a { font-size: 13px; }
            .banner-content h1 { font-size: 28px; }
            .banner-content .desc { font-size: 15px; }
            .btn-primary { padding: 12px 30px; font-size: 15px; width: 100%; text-align: center; }
            .features-grid { grid-template-columns: 1fr; }
            .scenarios-grid { grid-template-columns: 1fr; }
            .why-grid { grid-template-columns: 1fr; }
            .node-regions { grid-template-columns: repeat(2, 1fr); }
            .nav-highlight-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .footer-bottom .info span { display: inline-block; margin: 0 8px 4px; }
            .stats { grid-template-columns: 1fr 1fr; gap: 4px; }
            .stat-item .number { font-size: 28px; }
            .section-title { font-size: 26px; }
        }
        @media (max-width: 400px) {
            .stats { grid-template-columns: 1fr 1fr; }
            .stat-item { padding: 8px 4px; }
            .stat-item .number { font-size: 24px; }
        }