:root {
            --accent: #6D28D9;
            --accent-light: #EDE9FE;
            --text-dark: #0F172A;
            --text-muted: #64748B;
            --bg-aside: #F5F3FF;
            --bg-main: #FFFFFF;
            --border-line: #E2E8F0;
            --card-bg: #FFFFFF;
            --hover-shadow: 0 12px 28px rgba(109,40,217,0.08);
            --radius-md: 14px;
            --radius-sm: 10px;
        }
        * { box-sizing: border-box; margin: 0; padding: 0; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
            color: var(--text-dark);
            background: var(--bg-main);
            line-height: 1.6;
        }
        .app-container { display: flex; min-height: 100vh; }
        aside {
            width: 320px;
            background: var(--bg-aside);
            border-right: 1px solid var(--border-line);
            padding: 40px 28px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            position: fixed;
            top: 0;
            bottom: 0;
            left: 0;
            z-index: 10;
            overflow-y: auto;
        }
        .brand-section .logo-link {
            font-size: 24px;
            font-weight: 800;
            color: var(--accent);
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: -0.5px;
        }
        .brand-section .logo-link img {
            filter: drop-shadow(0 2px 4px rgba(109,40,217,0.2));
        }
        .site-intro {
            font-size: 13px;
            color: var(--text-muted);
            margin-top: 16px;
            text-align: justify;
            line-height: 1.7;
        }
        .side-nav { margin-top: 36px; }
        .side-nav ul { list-style: none; display: flex; flex-direction: column; gap: 8px; }
        .side-nav a {
            display: flex;
            align-items: center;
            justify-content: space-between;
            text-decoration: none;
            color: #374151;
            font-weight: 600;
            font-size: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            transition: all 0.2s;
        }
        .side-nav a:hover,
        .side-nav a.active {
            background: #fff;
            color: var(--accent);
            box-shadow: 0 4px 14px rgba(109,40,217,0.05);
        }
        .side-nav a::after {
            content: "→";
            opacity: 0;
            transform: translateX(-6px);
            transition: all 0.2s;
            font-weight: 400;
        }
        .side-nav a:hover::after,
        .side-nav a.active::after {
            opacity: 1;
            transform: translateX(0);
        }
        .aside-meta {
            font-size: 12px;
            color: #94a3b8;
            border-top: 1px solid var(--border-line);
            padding-top: 24px;
        }
        .aside-meta a {
            color: var(--text-muted);
            text-decoration: none;
            display: inline-block;
            margin-bottom: 6px;
            transition: color 0.2s;
        }
        .aside-meta a:hover { color: var(--accent); }
        .aside-meta p { margin-top: 10px; line-height: 1.5; }

        main {
            margin-left: 320px;
            flex: 1;
            padding: 60px 80px;
            max-width: 1120px;
        }
        .breadcrumb-trail {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 28px;
        }
        .breadcrumb-trail a { color: var(--text-muted); text-decoration: none; }
        .breadcrumb-trail a:hover { color: var(--accent); }

        .page-header {
            margin-bottom: 48px;
        }
        .page-header h1 {
            font-size: 42px;
            font-weight: 800;
            letter-spacing: -1px;
            background: linear-gradient(135deg, #6D28D9 0%, #4F46E5 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 14px;
        }
        .page-header p {
            font-size: 19px;
            color: var(--text-muted);
            font-weight: 400;
        }

        .section-title {
            font-size: 28px;
            font-weight: 800;
            color: #1E293B;
            margin-bottom: 24px;
            letter-spacing: -0.5px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .platform-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-bottom: 60px;
        }
        .platform-card {
            background: var(--card-bg);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-md);
            padding: 30px 24px;
            display: flex;
            flex-direction: column;
            transition: all 0.25s;
        }
        .platform-card:hover {
            border-color: var(--accent);
            box-shadow: var(--hover-shadow);
            transform: translateY(-4px);
        }
        .platform-icon {
            font-size: 44px;
            margin-bottom: 18px;
        }
        .platform-card h3 {
            font-size: 20px;
            font-weight: 700;
            color: #0F172A;
            margin-bottom: 8px;
        }
        .platform-card .version {
            font-size: 13px;
            color: #6B7280;
            margin-bottom: 12px;
        }
        .platform-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 20px;
            flex: 1;
        }
        .platform-card .download-btn {
            display: inline-block;
            background: #F1F5F9;
            color: #475569;
            text-decoration: none;
            padding: 12px 18px;
            border-radius: 8px;
            font-size: 14px;
            font-weight: 600;
            text-align: center;
            transition: all 0.2s;
        }
        .platform-card:hover .download-btn {
            background: var(--accent);
            color: #fff;
        }

        .timeline-section {
            background: var(--accent-light);
            border-radius: var(--radius-md);
            padding: 48px 40px;
            margin-bottom: 60px;
        }
        .timeline-list {
            list-style: none;
            border-left: 3px solid var(--accent);
            padding-left: 28px;
            margin-top: 24px;
        }
        .timeline-list li {
            margin-bottom: 24px;
            position: relative;
        }
        .timeline-list li::before {
            content: "";
            position: absolute;
            left: -35px;
            top: 5px;
            width: 12px;
            height: 12px;
            background: var(--accent);
            border-radius: 50%;
            border: 3px solid #fff;
        }
        .timeline-date {
            font-size: 13px;
            color: #6B7280;
            font-weight: 600;
        }
        .timeline-version {
            font-size: 16px;
            font-weight: 700;
            color: #0F172A;
            margin: 4px 0;
        }
        .timeline-desc {
            font-size: 14px;
            color: #374151;
            line-height: 1.6;
        }

        .guide-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
            margin-bottom: 60px;
        }
        .guide-card {
            background: var(--card-bg);
            border: 1px solid var(--border-line);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.2s;
        }
        .guide-card:hover {
            border-color: var(--accent);
            box-shadow: var(--hover-shadow);
        }
        .guide-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: #0F172A;
            margin-bottom: 12px;
        }
        .guide-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 18px;
        }
        .guide-card a {
            color: var(--accent);
            font-weight: 600;
            text-decoration: none;
            font-size: 14px;
        }
        .guide-card a:hover { text-decoration: underline; }

        .faq-mini {
            margin-bottom: 60px;
        }
        .faq-item {
            border-bottom: 1px solid var(--border-line);
            padding: 18px 0;
        }
        .faq-question {
            font-weight: 700;
            font-size: 16px;
            color: #0F172A;
            margin-bottom: 6px;
        }
        .faq-answer {
            font-size: 15px;
            color: #334155;
            line-height: 1.7;
        }

        @media(max-width:1024px) {
            aside { width: 260px; padding: 30px 20px; }
            main { margin-left: 260px; padding: 40px 40px; }
            .platform-grid { grid-template-columns: repeat(2, 1fr); }
            .guide-grid { grid-template-columns: 1fr; }
        }
        @media(max-width:768px) {
            .app-container { flex-direction: column; }
            aside { width: 100%; position: relative; border-right: none; border-bottom: 1px solid var(--border-line); padding: 24px 20px; }
            .side-nav { margin-top: 18px; }
            .side-nav ul { flex-direction: row; flex-wrap: wrap; gap: 10px; }
            .side-nav a { padding: 8px 14px; font-size: 13px; }
            .side-nav a::after { display: none; }
            main { margin-left: 0; padding: 28px 20px; }
            .page-header h1 { font-size: 30px; }
            .platform-grid { grid-template-columns: 1fr; }
        }