:root {
            --bg: #fef9f2;
            --surface: #ffffff;
            --text: #1e1e1e;
            --text-secondary: #5f5f5f;
            --brand: #f59e0b;
            --brand-dark: #d97706;
            --safe: #10b981;
            --border: #e5e7eb;
            --border-light: #f3f4f6;
            --radius: 16px;
            --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
        }
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "SF Pro Display", Helvetica, Arial, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }
        header {
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            background: rgba(254, 249, 242, 0.9);
            backdrop-filter: blur(16px);
            z-index: 100;
        }
        .nav-wrapper {
            max-width: 1300px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 16px 24px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        .brand-logo svg {
            width: 32px;
            height: 32px;
            fill: var(--brand);
        }
        .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.5px;
        }
        .brand-badge {
            font-size: 11px;
            font-weight: 700;
            background: #fef3c7;
            color: #b45309;
            padding: 2px 8px;
            border-radius: 4px;
        }
        nav {
            display: flex;
            gap: 36px;
        }
        nav a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 600;
            font-size: 14px;
            transition: color 0.2s;
        }
        nav a:hover,
        nav a.active {
            color: var(--brand-dark);
        }

        .container {
            max-width: 1300px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Hero */
        .hero {
            display: grid;
            grid-template-columns: 1.1fr 1fr;
            gap: 60px;
            align-items: center;
            padding: 80px 0 60px;
        }
        @media (max-width: 860px) {
            .hero {
                grid-template-columns: 1fr;
                text-align: center;
            }
        }
        .hero h1 {
            font-size: clamp(40px, 5vw, 56px);
            font-weight: 900;
            line-height: 1.1;
            letter-spacing: -2px;
            margin-bottom: 24px;
        }
        .hero h1 span {
            color: var(--brand);
            position: relative;
        }
        .hero p {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 36px;
            line-height: 1.7;
        }
        .btn-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        .btn-primary {
            background: var(--text);
            color: #fff;
            padding: 14px 32px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 700;
            font-size: 16px;
            transition: background 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .btn-primary:hover {
            background: #2d2d2d;
        }
        .btn-outline {
            background: transparent;
            color: var(--text);
            border: 2px solid var(--border);
            padding: 14px 32px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 700;
            font-size: 16px;
            transition: background 0.2s, border-color 0.2s;
        }
        .btn-outline:hover {
            background: #fff;
            border-color: var(--brand);
        }
        .hero-visual {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 24px;
            padding: 24px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.03);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
        }
        .hero-visual svg {
            width: 100%;
            max-width: 280px;
            height: auto;
        }
        .hero-visual .caption {
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .caption .dot {
            width: 10px;
            height: 10px;
            background: var(--safe);
            border-radius: 50%;
            display: inline-block;
        }

        /* GitHub 开源横幅 */
        .github-ribbon {
            padding: 0 0 40px 0;
        }
        .github-card {
            display: flex;
            align-items: center;
            gap: 24px;
            background: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%);
            border: 1px solid #fcd34d;
            border-radius: 16px;
            padding: 28px 36px;
            flex-wrap: wrap;
        }
        .github-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            background: #1e1e1e;
            color: #f59e0b;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .github-text {
            flex: 1;
            min-width: 200px;
        }
        .github-text h4 {
            font-size: 17px;
            font-weight: 800;
            margin-bottom: 6px;
            color: var(--text);
        }
        .github-text p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.5;
            margin: 0;
        }
        .btn-github {
            flex-shrink: 0;
            background-color: #1e1e1e;
            color: #fbbf24;
            padding: 12px 24px;
            border-radius: 40px;
            text-decoration: none;
            font-weight: 700;
            font-size: 14px;
            transition: background-color 0.2s;
            white-space: nowrap;
        }
        .btn-github:hover {
            background-color: #2d2d2d;
        }

        /* 安全下载特性 */
.safety-strip {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 40px;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;   /* 内部项目始终居中 */
    align-items: center;
    gap: 40px;
    margin: 40px auto 80px;     /* 上下间距保留，左右auto实现自身居中 */
    max-width: 900px;           /* 限制背景框最大宽度，可根据设计调整 */
}
.safety-item {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 0 0 auto;              /* 防止伸缩，保持原有大小 */
    text-align: left;
}
        .safety-icon {
            width: 48px;
            height: 48px;
            background: #f0fdf4;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--safe);
            font-size: 24px;
        }
        .safety-text strong {
            display: block;
            font-size: 16px;
            font-weight: 700;
        }
        .safety-text span {
            font-size: 14px;
            color: var(--text-secondary);
        }

        /* 通用标题 */
        .section-label {
            font-size: 13px;
            font-weight: 800;
            text-transform: uppercase;
            color: var(--brand-dark);
            letter-spacing: 2px;
            margin-bottom: 12px;
            display: block;
        }
        .section-title {
            font-size: 36px;
            font-weight: 900;
            letter-spacing: -1px;
            margin-bottom: 48px;
        }

        /* 安装教程步骤 */
        .install-steps {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
            margin-bottom: 80px;
        }
        @media (max-width: 800px) {
            .install-steps {
                grid-template-columns: 1fr;
            }
        }
        .step-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 20px;
            padding: 36px 28px;
            position: relative;
            transition: box-shadow 0.2s;
        }
        .step-card:hover {
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.04);
        }
        .step-number {
            font-family: var(--mono);
            font-size: 48px;
            font-weight: 900;
            color: #fde68a;
            position: absolute;
            top: 20px;
            right: 28px;
            line-height: 1;
        }
        .step-card h3 {
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }
        .step-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            margin-bottom: 16px;
        }
        .step-card ul {
            list-style: none;
            font-size: 14px;
            color: var(--text-secondary);
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .step-card ul li::before {
            content: "✓ ";
            color: var(--safe);
            font-weight: bold;
        }
        .step-arrow {
            display: none;
        }
        @media (min-width: 801px) {
            .step-arrow {
                display: block;
                position: absolute;
                right: -28px;
                top: 50%;
                transform: translateY(-50%);
                font-size: 24px;
                color: var(--border);
                z-index: 2;
            }
            .step-card:last-child .step-arrow {
                display: none;
            }
        }

        /* 版本信息 */
        .version-panel {
            background: #1e1e1e;
            color: #e5e7eb;
            border-radius: 20px;
            padding: 40px;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 80px;
        }
        .version-info h4 {
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #fbbf24;
            margin-bottom: 12px;
        }
        .version-info .ver {
            font-size: 32px;
            font-weight: 900;
            color: #fff;
            font-family: var(--mono);
        }
        .version-info .hash {
            font-size: 13px;
            font-family: var(--mono);
            color: #9ca3af;
            margin-top: 8px;
            word-break: break-all;
        }
        .version-badge {
            background: #065f46;
            color: #6ee7b7;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 14px;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }

        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-bottom: 80px;
        }
        @media (max-width: 700px) {
            .faq-grid {
                grid-template-columns: 1fr;
            }
        }
        details {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 20px 24px;
            cursor: pointer;
            transition: border-color 0.2s;
        }
        details[open] {
            border-color: var(--brand);
        }
        summary {
            font-weight: 700;
            font-size: 16px;
            list-style: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        summary::-webkit-details-marker {
            display: none;
        }
        summary::after {
            content: "+";
            font-size: 22px;
            color: var(--brand);
            transition: transform 0.2s;
        }
        details[open] summary::after {
            content: "−";
        }
        .faq-answer {
            margin-top: 16px;
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* 友情链接 */
        .links-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-bottom: 80px;
        }
        @media (max-width: 600px) {
            .links-grid {
                grid-template-columns: 1fr;
            }
        }
        .link-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: 12px;
            padding: 20px;
            text-decoration: none;
            display: flex;
            flex-direction: column;
            gap: 6px;
            transition: border-color 0.2s;
        }
        .link-card:hover {
            border-color: var(--brand);
        }
        .link-card .title {
            font-weight: 700;
            color: var(--text);
        }
        .link-card .desc {
            font-size: 13px;
            color: var(--text-secondary);
        }

        /* Footer */
        footer {
            background: #fff;
            border-top: 1px solid var(--border);
            padding: 60px 24px 40px;
        }
        .footer-grid {
            max-width: 1300px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1.5fr repeat(3, 1fr);
            gap: 40px;
            padding-bottom: 40px;
        }
        @media (max-width: 800px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        .footer-col h5 {
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: #9ca3af;
            margin-bottom: 20px;
        }
        .footer-col ul {
            list-style: none;
        }
        .footer-col li {
            margin-bottom: 10px;
        }
        .footer-col a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 14px;
        }
        .footer-col a:hover {
            color: var(--brand-dark);
        }
        .footer-bottom {
            max-width: 1300px;
            margin: 0 auto;
            border-top: 1px solid var(--border);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            font-size: 13px;
            color: var(--text-secondary);
            flex-wrap: wrap;
            gap: 16px;
        }
        .footer-bottom a {
            color: var(--text-secondary);
            text-decoration: none;
            margin-left: 20px;
        }