/* ---------- 全局：与首页完全一致 ---------- */
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            background: #f4f6fe;
            color: #1e1e2f;
            font-family: 'Inter', -apple-system, 'Segoe UI', Roboto, sans-serif;
            line-height: 1.6;
            background-image: radial-gradient(circle at 10% 20%, rgba(163, 133, 255, 0.04) 0%, transparent 30%);
            min-height: 100vh;
        }
        a { text-decoration: none; color: inherit; transition: 0.2s ease; }
        .container { max-width: 1240px; margin: 0 auto; padding: 0 28px; width: 100%; }

        /* ---------- 导航栏：与首页完全一致 ---------- */
        header {
            padding: 14px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.55);
            backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid rgba(255, 255, 255, 0.7);
        }
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo-box {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .logo-img {
            height: 38px;
            width: auto;
            filter: drop-shadow(0 2px 6px rgba(128, 90, 213, 0.2));
        }
        .logo-text {
            font-weight: 800;
            font-size: 1.5rem;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #7c5cfc 0%, #b473ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .nav-links {
            display: flex;
            gap: 32px;
            align-items: center;
        }
        .nav-links a {
            font-weight: 550;
            color: #48486a;
            font-size: 0.98rem;
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: 0.2s;
        }
        .nav-links a:hover {
            color: #6d4cf0;
            border-bottom-color: #6d4cf0;
        }
        /* 下载中心高亮（与首页 nav-links a:nth-child(2) 样式一致） */
        .nav-links a.active {
            background: linear-gradient(135deg, #7c5cfc, #b473ff);
            color: white;
            padding: 8px 22px;
            border-radius: 60px;
            border-bottom: none;
            font-weight: 600;
            box-shadow: 0 6px 16px rgba(124, 92, 252, 0.25);
        }
        .nav-links a.active:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(124, 92, 252, 0.35);
            border-bottom: none;
            color: white;
        }
        /* 去除帮助文档链接 */
        .nav-links a:last-child {
            display: none;
        }

        /* ---------- 下载首屏：与首页 Hero 完全一致 ---------- */
        .hero {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 70px 0 90px;
            gap: 40px;
        }
        .hero-content {
            flex: 1 1 500px;
        }
        .hero-content .badge {
            display: inline-block;
            background: rgba(124, 92, 252, 0.12);
            color: #5b3dd9;
            font-weight: 600;
            font-size: 0.8rem;
            padding: 6px 18px;
            border-radius: 100px;
            letter-spacing: 0.3px;
            margin-bottom: 20px;
            backdrop-filter: blur(4px);
        }
        .hero h1 {
            font-size: 3.7rem;
            font-weight: 800;
            line-height: 1.1;
            letter-spacing: -1px;
            margin-bottom: 18px;
        }
        .hero h1 span {
            background: linear-gradient(145deg, #7c5cfc, #b473ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.15rem;
            color: #4a4a6a;
            max-width: 460px;
            margin-bottom: 38px;
            line-height: 1.7;
        }
        .btn-group {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        /* 下载按钮保持原样，不做任何改动 */
        .btn-dl {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 12px;
            padding: 16px 48px;
            border-radius: 60px;
            font-weight: 700;
            font-size: 1.05rem;
            background: linear-gradient(135deg, #7c5cfc, #a06cff);
            color: #fff;
            border: none;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.2, 0, 0, 1);
            box-shadow: 0 14px 32px rgba(124, 92, 252, 0.3);
        }
        .btn-dl:hover {
            transform: translateY(-4px);
            box-shadow: 0 22px 44px rgba(124, 92, 252, 0.4);
        }
        .btn-dl svg {
            width: 22px;
            height: 22px;
            flex-shrink: 0;
        }
        .btn-secondary {
            background: rgba(255, 255, 255, 0.5);
            backdrop-filter: blur(6px);
            border: 1px solid rgba(124, 92, 252, 0.2);
            color: #2f2f4a;
            padding: 16px 36px;
            border-radius: 60px;
            font-weight: 600;
            transition: 0.25s;
        }
        .btn-secondary:hover {
            background: white;
            border-color: #7c5cfc;
            box-shadow: 0 6px 18px rgba(124, 92, 252, 0.08);
            transform: translateY(-2px);
        }

        /* 右侧视觉 (与首页一致的笔记本) */
        .hero-visual {
            flex: 1 1 400px;
            display: flex;
            justify-content: center;
            perspective: 1000px;
        }
        .laptop {
            position: relative;
            width: 400px;
            height: 240px;
            background: #21212e;
            border-radius: 16px;
            border: 6px solid #3a3a4e;
            transform: rotateY(-12deg) rotateX(6deg);
            box-shadow: 30px 40px 70px rgba(0,0,0,0.18);
            transition: transform 0.6s;
        }
        .laptop:hover {
            transform: rotateY(-6deg) rotateX(4deg) scale(1.01);
        }
        .laptop::after {
            content: "";
            position: absolute;
            bottom: -18px;
            left: -4%;
            width: 108%;
            height: 12px;
            background: #14141e;
            border-radius: 0 0 16px 16px;
        }
        .screen {
            width: 100%;
            height: 100%;
            background: #101018;
            border-radius: 8px;
            display: flex;
            justify-content: center;
            align-items: center;
            overflow: hidden;
            position: relative;
        }
        .screen-logo {
            width: 90px;
            filter: drop-shadow(0 0 30px rgba(130, 90, 255, 0.5));
        }
        .screen::before {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(circle at 70% 30%, rgba(130, 90, 255, 0.08), transparent 60%);
        }

        /* ---------- 旧版本卡片：与首页 feature-card 一致 ---------- */
        .section-title {
            text-align: center;
            font-size: 2.3rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 50px;
            color: #1c1c30;
        }
        .section-title::after {
            content: "✦";
            color: #7c5cfc;
            margin-left: 10px;
            font-weight: 300;
        }
        .legacy-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin-bottom: 90px;
        }
        .legacy-card {
            background: rgba(255,255,255,0.5);
            backdrop-filter: blur(8px);
            padding: 34px 28px;
            border-radius: 32px;
            border: 1px solid rgba(255,255,255,0.7);
            box-shadow: 0 8px 26px rgba(0,0,0,0.02);
            transition: 0.25s ease;
            text-align: center;
        }
        .legacy-card:hover {
            transform: translateY(-8px);
            background: rgba(255,255,255,0.8);
            border-color: rgba(124, 92, 252, 0.2);
            box-shadow: 0 18px 40px rgba(124, 92, 252, 0.06);
        }
        .legacy-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }
        .legacy-card p {
            color: #4d4d6e;
            margin-bottom: 16px;
            font-size: 0.95rem;
        }
        .status-tag {
            display: inline-block;
            background: rgba(255, 77, 79, 0.12);
            color: #ff4d4f;
            font-weight: 600;
            font-size: 0.75rem;
            padding: 4px 16px;
            border-radius: 100px;
            margin-bottom: 16px;
        }
        .btn-git {
            display: inline-block;
            padding: 10px 28px;
            border: 2px solid #7c5cfc;
            color: #7c5cfc;
            border-radius: 60px;
            font-weight: 600;
            transition: 0.2s;
        }
        .btn-git:hover {
            background: #7c5cfc;
            color: #fff;
        }
        .link-tutorial {
            color: #7c5cfc;
            font-weight: 600;
            font-size: 0.85rem;
            display: inline-block;
            margin-top: 10px;
        }
        .link-tutorial:hover {
            color: #b473ff;
        }

        /* ---------- 演示图区域：与首页风格一致 ---------- */
        .preview-wrapper { margin-bottom: 100px; }
        .preview-container {
            display: flex;
            gap: 24px;
            align-items: stretch;
            position: relative;
        }
        .preview-container::after {
            content: "";
            position: absolute;
            left: 50%;
            top: 10%;
            bottom: 10%;
            width: 1px;
            background: rgba(163, 133, 255, 0.2);
            transform: translateX(-50%);
            z-index: 5;
        }
        .preview-box {
            position: relative;
            flex: 1;
            overflow: hidden;
            border-radius: 24px;
            background: rgba(255,255,255,0.4);
            backdrop-filter: blur(4px);
            border: 1px solid rgba(255,255,255,0.6);
            padding-top: 56px;
            box-shadow: 0 8px 26px rgba(0,0,0,0.02);
            transition: 0.25s ease;
        }
        .preview-box:hover {
            transform: translateY(-4px);
            box-shadow: 0 18px 40px rgba(124, 92, 252, 0.06);
        }
        .preview-img {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.5s ease;
        }
        .preview-box:hover .preview-img {
            transform: scale(1.01);
        }
        .img-label {
            position: absolute;
            top: 14px;
            left: 50%;
            transform: translateX(-50%);
            padding: 6px 24px;
            backdrop-filter: blur(12px);
            font-weight: 700;
            font-size: 0.8rem;
            border-radius: 50px;
            z-index: 10;
            white-space: nowrap;
            letter-spacing: 0.3px;
        }
        .label-dark {
            background: rgba(30, 30, 45, 0.85);
            color: #fff;
            border: 1px solid rgba(255,255,255,0.1);
        }
        .label-light {
            background: rgba(255, 255, 255, 0.85);
            color: #1e1e2f;
            border: 1px solid rgba(163, 133, 255, 0.15);
            box-shadow: 0 4px 12px rgba(0,0,0,0.04);
        }

        /* ---------- 页脚：与首页完全一致 ---------- */
        footer {
            background: #fff;
            padding: 70px 0 30px;
            border-top: 1px solid rgba(124, 92, 252, 0.06);
            margin-top: 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
        }
        .footer-brand .logo-box { margin-bottom: 16px; }
        .footer-desc {
            color: #5a5a7a;
            font-size: 0.95rem;
            max-width: 320px;
            line-height: 1.7;
        }
        .footer-column h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #1e1e34;
            margin-bottom: 24px;
            letter-spacing: 0.3px;
        }
        .footer-column ul { list-style: none; }
        .footer-column ul li { margin-bottom: 12px; }
        .footer-column ul li a {
            color: #5e5e80;
            font-size: 0.92rem;
            transition: 0.2s;
        }
        .footer-column ul li a:hover {
            color: #7c5cfc;
            padding-left: 6px;
        }
        .footer-bottom {
            margin-top: 60px;
            padding-top: 24px;
            border-top: 1px solid #ececf5;
            text-align: center;
            color: #8a8aaa;
            font-size: 0.85rem;
            letter-spacing: 0.2px;
        }

        /* ---------- 响应式 ---------- */
        @media (max-width: 900px) {
            .hero { flex-direction: column; text-align: center; padding: 40px 0 60px; }
            .hero-content { max-width: 100%; }
            .hero p { margin-left: auto; margin-right: auto; }
            .btn-group { justify-content: center; }
            .laptop { width: 300px; height: 180px; transform: none; }
            .laptop:hover { transform: scale(1.02); }
            .preview-container { flex-direction: column; gap: 30px; }
            .preview-container::after { display: none; }
            .preview-box { width: 100%; padding-top: 60px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .footer-brand { grid-column: span 2; }
            .legacy-section { grid-template-columns: 1fr; }
        }
        @media (max-width: 600px) {
            .hero h1 { font-size: 2.7rem; }
            .nav-links a:last-child { display: none; }
            .logo-text { font-size: 1.2rem; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-brand { grid-column: span 1; }
        }