* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #0b0e17;
            color: #e8edf5;
            line-height: 1.6;
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        .nav a.active {
            color: #fff;
            border-bottom: 2px solid #3b82f6;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .header {
            padding: 18px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            position: sticky;
            top: 0;
            background: rgba(11, 14, 23, 0.92);
            backdrop-filter: blur(12px);
            z-index: 100;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .logo {
            font-size: 22px;
            font-weight: 700;
            letter-spacing: -0.3px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo svg {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }
        .logo span {
            color: #3b82f6;
        }
        .logo small {
            font-size: 12px;
            font-weight: 400;
            color: #8b95a9;
            margin-left: 6px;
            letter-spacing: 0.2px;
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 28px;
            font-size: 15px;
            font-weight: 500;
            flex-wrap: wrap;
        }
        .nav a {
            color: #b0baca;
            transition: color 0.2s;
        }
        .nav a:hover {
            color: #fff;
        }

        .hero {
            padding: 48px 0 32px;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .hero-text h1 {
            font-size: 40px;
            font-weight: 800;
            line-height: 1.15;
            letter-spacing: -0.5px;
        }
        .hero-text h1 .highlight {
            color: #3b82f6;
        }
        .hero-text .sub {
            margin-top: 16px;
            font-size: 18px;
            color: #aab3c9;
            max-width: 520px;
        }
        .hero-text .sub strong {
            color: #e8edf5;
            font-weight: 600;
        }
        .hero-text .badge-row {
            margin-top: 20px;
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }
        .hero-text .badge-row span {
            background: rgba(59, 130, 246, 0.12);
            border: 1px solid rgba(59, 130, 246, 0.20);
            padding: 4px 16px;
            border-radius: 40px;
            font-size: 13px;
            color: #8bb4ff;
        }
        .hero-text .cta-group {
            margin-top: 28px;
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }
        .hero-text .cta-primary {
            background: linear-gradient(135deg, #3b82f6, #6366f1);
            color: #fff;
            padding: 12px 40px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 16px;
            transition: transform 0.15s, box-shadow 0.2s;
            display: inline-block;
        }
        .hero-text .cta-primary:hover {
            transform: scale(1.02);
            box-shadow: 0 8px 28px rgba(59, 130, 246, 0.40);
        }
        .hero-text .cta-secondary {
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: #d0d8e8;
            padding: 12px 32px;
            border-radius: 40px;
            font-weight: 500;
            font-size: 16px;
            transition: background 0.2s;
            display: inline-block;
        }
        .hero-text .cta-secondary:hover {
            background: rgba(255, 255, 255, 0.12);
        }

        .hero-image {
            background: rgba(255, 255, 255, 0.02);
            border-radius: 24px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.06);
            aspect-ratio: 16 / 10;
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
        }
        .hero-image .topo-svg {
            width: 90%;
            height: 90%;
            display: block;
        }

        .section-title {
            font-size: 28px;
            font-weight: 700;
            letter-spacing: -0.3px;
            margin-bottom: 6px;
        }
        .section-sub {
            color: #8b95a9;
            font-size: 16px;
            margin-bottom: 28px;
        }

        /* 下载矩阵 */
        .download-section {
            padding: 40px 0 20px;
        }
        .download-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 18px;
            margin-top: 10px;
        }
        .download-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 16px;
            padding: 20px 22px;
            transition: background 0.2s, border-color 0.2s;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .download-card:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: rgba(59, 130, 246, 0.25);
        }
        .download-card .plat {
            font-weight: 600;
            font-size: 17px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .download-card .plat .tag {
            font-size: 11px;
            background: rgba(59, 130, 246, 0.18);
            color: #8bb4ff;
            padding: 0 10px;
            border-radius: 30px;
            font-weight: 500;
        }
        .download-card .meta {
            font-size: 13px;
            color: #8b95a9;
        }
        .download-card .btn-download {
            margin-top: 10px;
            background: rgba(59, 130, 246, 0.15);
            border: 1px solid rgba(59, 130, 246, 0.25);
            color: #8bb4ff;
            padding: 8px 0;
            border-radius: 40px;
            text-align: center;
            font-weight: 500;
            transition: background 0.2s;
        }
        .download-card .btn-download:hover {
            background: rgba(59, 130, 246, 0.30);
            color: #fff;
        }

        /* 三步上手 */
        .steps-section {
            padding: 40px 0 20px;
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 20px;
            margin-top: 6px;
        }
        .step-card {
            background: rgba(255, 255, 255, 0.02);
            border-radius: 16px;
            padding: 24px 20px;
            border: 1px solid rgba(255, 255, 255, 0.04);
            transition: background 0.2s;
            position: relative;
        }
        .step-card:hover {
            background: rgba(255, 255, 255, 0.05);
        }
        .step-card .step-num {
            font-size: 32px;
            font-weight: 800;
            color: rgba(59, 130, 246, 0.30);
            margin-bottom: 8px;
            line-height: 1;
        }
        .step-card h4 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .step-card p {
            font-size: 14px;
            color: #aab3c9;
        }

        /* 使用场景 */
        .scenario-section {
            padding: 40px 0 20px;
        }
        .scenario-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 18px;
            margin-top: 6px;
        }
        .scenario-card {
            background: rgba(255, 255, 255, 0.02);
            border-radius: 16px;
            padding: 22px 20px;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }
        .scenario-card h4 {
            font-size: 17px;
            font-weight: 600;
            margin-bottom: 4px;
        }
        .scenario-card p {
            font-size: 14px;
            color: #aab3c9;
        }

        /* 版本日志时间线 */
        .timeline-section {
            padding: 40px 0 20px;
        }
        .timeline {
            margin-top: 10px;
            border-left: 2px solid rgba(59, 130, 246, 0.25);
            padding-left: 24px;
        }
        .timeline-item {
            margin-bottom: 18px;
            position: relative;
        }
        .timeline-item::before {
            content: "";
            position: absolute;
            left: -30px;
            top: 6px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: #3b82f6;
            border: 2px solid #0b0e17;
        }
        .timeline-item .date {
            font-size: 13px;
            color: #8b95a9;
        }
        .timeline-item h5 {
            font-size: 16px;
            font-weight: 600;
            margin: 2px 0;
        }
        .timeline-item p {
            font-size: 14px;
            color: #aab3c9;
        }

        /* FAQ 手风琴 */
        .faq-section {
            padding: 40px 0 20px;
        }
        .faq-list {
            margin-top: 10px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-list details {
            background: rgba(255, 255, 255, 0.02);
            border: 1px solid rgba(255, 255, 255, 0.06);
            border-radius: 12px;
            padding: 16px 20px;
        }
        .faq-list summary {
            cursor: pointer;
            font-weight: 600;
            color: #d0d8e8;
            list-style: none;
            position: relative;
            padding-right: 24px;
        }
        .faq-list summary::after {
            content: "+";
            position: absolute;
            right: 0;
            top: 0;
            font-size: 20px;
            color: #3b82f6;
        }
        .faq-list details[open] summary::after {
            content: "−";
        }
        .faq-list p {
            margin-top: 10px;
            font-size: 14px;
            color: #aab3c9;
        }

        /* 页脚下拉工具区 */
        .footer-tools {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            display: flex;
            justify-content: center;
        }
        .footer-select {
            position: relative;
            width: 280px;
            max-width: 100%;
        }
        .footer-select-btn {
            width: 100%;
            background: rgba(255, 255, 255, 0.06);
            border: 1px solid rgba(255, 255, 255, 0.12);
            color: #d0d8e8;
            padding: 12px 20px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            transition: background 0.2s, border-color 0.2s;
        }
        .footer-select-btn:hover {
            background: rgba(255, 255, 255, 0.12);
            border-color: rgba(59, 130, 246, 0.25);
        }
        .footer-select-btn svg {
            transition: transform 0.2s;
        }
        .footer-select.open .footer-select-btn svg {
            transform: rotate(180deg);
        }
        .footer-select-dropdown {
            position: absolute;
            bottom: calc(100% + 8px);
            left: 0;
            right: 0;
            background: #131722;
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 16px;
            padding: 8px;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            gap: 4px;
            max-height: 220px;
            overflow-y: auto;
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
            z-index: 200;
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
        }
        .footer-select.open .footer-select-dropdown {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }
        .footer-select-dropdown a {
            color: #b0baca;
            font-size: 13px;
            padding: 6px 10px;
            border-radius: 8px;
            transition: background 0.15s, color 0.15s;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .footer-select-dropdown a:hover {
            background: rgba(59, 130, 246, 0.12);
            color: #8bb4ff;
        }

        .footer {
            margin-top: 50px;
            padding: 36px 0 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 14px;
            color: #7a86a0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 24px;
        }
        .footer-grid .col h5 {
            color: #d0d8e8;
            font-weight: 600;
            font-size: 15px;
            margin-bottom: 10px;
        }
        .footer-grid .col p,
        .footer-grid .col a {
            color: #7a86a0;
            line-height: 1.8;
            display: block;
        }
        .footer-grid .col a:hover {
            color: #c8d0e0;
        }
        .footer-bottom {
            margin-top: 28px;
            padding-top: 18px;
            border-top: 1px solid rgba(255, 255, 255, 0.04);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            font-size: 13px;
            color: #5d6a82;
        }
        .footer-bottom .version-badge {
            background: rgba(59, 130, 246, 0.10);
            border: 1px solid rgba(59, 130, 246, 0.15);
            padding: 2px 16px;
            border-radius: 40px;
            font-size: 12px;
            color: #8bb4ff;
        }

        @media (max-width: 900px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .hero-text h1 {
                font-size: 32px;
            }
            .hero-image {
                aspect-ratio: 16 / 9;
            }
            .header-inner {
                flex-direction: column;
                gap: 14px;
            }
            .nav {
                justify-content: center;
                gap: 16px;
                font-size: 14px;
            }
        }
        @media (max-width: 480px) {
            .hero-text h1 {
                font-size: 26px;
            }
            .hero-text .sub {
                font-size: 16px;
            }
            .nav {
                gap: 12px;
                font-size: 13px;
            }
            .section-title {
                font-size: 22px;
            }
            .download-grid {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
            }
            .scenario-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                gap: 10px;
                text-align: center;
            }
            .footer-select {
                width: 100%;
            }
        }
        @media (max-width: 380px) {
            .download-grid,
            .steps-grid {
                grid-template-columns: 1fr;
            }
        }