* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', 'Noto Sans SC', sans-serif;
            background: #ffffff;
            color: #1A202C;
            line-height: 1.5;
            scroll-behavior: smooth;
        }
        .container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 24px;
        }
        header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(0,0,0,0.05);
            transition: all 0.3s ease;
        }
        .header-content {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            text-decoration: none;
        }
        .logo-icon {
            width: 34px;
            height: 34px;
            background: linear-gradient(135deg, #2563EB 0%, #1E40AF 100%);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 6px 12px -6px rgba(37,99,235,0.25);
        }
        .logo-icon svg {
            width: 22px;
            height: 22px;
            fill: white;
        }
        .logo-text {
            font-size: 1.55rem;
            font-weight: 700;
            background: linear-gradient(120deg, #0F172A 30%, #2563EB 90%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            letter-spacing: -0.3px;
        }
        nav ul {
            display: flex;
            gap: 2rem;
            list-style: none;
        }
        nav a {
            text-decoration: none;
            font-weight: 500;
            color: #334155;
            transition: 0.2s;
            font-size: 0.95rem;
        }
        nav a:hover {
            color: #2563EB;
        }
        .header-actions {
            display: flex;
            gap: 12px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 8px 20px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.9rem;
            transition: all 0.2s ease;
            text-decoration: none;
            border: 1px solid transparent;
            cursor: pointer;
        }
        .btn-outline {
            border-color: #CBD5E1;
            background: transparent;
            color: #1E293B;
        }
        .btn-outline:hover {
            border-color: #2563EB;
            color: #2563EB;
            background: #EFF6FF;
        }
        .btn-primary {
            background: #2563EB;
            color: white;
            box-shadow: 0 4px 8px -2px rgba(37,99,235,0.3);
        }
        .btn-primary:hover {
            background: #1D4ED8;
            transform: translateY(-1px);
        }
        .download-hero {
            padding: 80px 0 90px;
            background: radial-gradient(ellipse 80% 50% at 20% 40%, rgba(37,99,235,0.03), transparent);
            position: relative;
            overflow: hidden;
        }
        .download-hero-content {
            text-align: center;
            max-width: 1200px;
            margin: 0 auto;
        }
        .download-hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(37,99,235,0.1);
            backdrop-filter: blur(2px);
            padding: 6px 16px;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 500;
            color: #1E40AF;
            margin-bottom: 24px;
            border: 1px solid rgba(37,99,235,0.2);
        }
        .version-tag {
            background: #2563EB;
            color: white;
            font-size: 0.7rem;
            padding: 2px 8px;
            border-radius: 30px;
            margin-left: 6px;
        }
        .download-hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 100%);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
            margin-bottom: 16px;
        }
        .download-hero p {
            font-size: 1.12rem;
            color: #334155;
            max-width: 680px;
            margin: 0 auto 48px;
        }
        .platform-cards {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 32px;
            margin-top: 20px;
        }
        .platform-card {
            background: white;
            border-radius: 32px;
            padding: 32px 24px;
            text-align: center;
            flex: 1;
            min-width: 210px;
            max-width: 260px;
            transition: all 0.3s ease;
            border: 1px solid #EFF3F8;
            box-shadow: 0 4px 12px rgba(0,0,0,0.02);
        }
        .platform-card.recommended {
            border: 2px solid #2563EB;
            position: relative;
        }
        .platform-card.recommended::before {
            content: "推荐";
            position: absolute;
            top: -12px;
            right: 20px;
            background: #2563EB;
            color: white;
            font-size: 0.7rem;
            padding: 4px 12px;
            border-radius: 30px;
            font-weight: 500;
        }
        .platform-card:hover {
            transform: translateY(-6px);
            border-color: #C7DDFF;
            box-shadow: 0 24px 40px -16px rgba(37,99,235,0.2);
        }
        .platform-icon svg {
            width: 52px;
            height: 52px;
            fill: #2563EB;
        }
        .platform-card h3 {
            font-size: 1.5rem;
            margin: 16px 0 8px;
        }
        .version {
            color: #475569;
            font-size: 0.85rem;
        }
        .file-size {
            color: #2563EB;
            font-weight: 500;
            margin: 8px 0 20px;
        }
        .btn-download {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #F1F5F9;
            color: #1E293B;
            padding: 10px 20px;
            border-radius: 40px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.2s;
            border: 1px solid transparent;
        }
        .btn-download-main {
            background: #2563EB;
            color: white;
            box-shadow: 0 4px 8px -2px rgba(37,99,235,0.3);
        }
        .btn-download:hover {
            background: #2563EB;
            color: white;
            transform: translateY(-2px);
        }
        .btn-download svg {
            width: 18px;
            height: 18px;
            fill: currentColor;
        }
        .download-steps {
            padding: 80px 0;
            background: #F8FAFE;
        }
        .section-header {
            text-align: center;
            margin-bottom: 64px;
        }
        .section-title {
            font-size: 2.5rem;
            font-weight: 700;
            margin-bottom: 16px;
            background: linear-gradient(120deg, #0F172A, #1E3A8A);
            background-clip: text;
            -webkit-background-clip: text;
            color: transparent;
        }
        .section-subtitle {
            color: #475569;
            max-width: 650px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 32px;
        }
        .step-card {
            background: white;
            border-radius: 28px;
            padding: 32px 24px;
            text-align: center;
            transition: all 0.3s;
            border: 1px solid #EFF3F8;
        }
        .step-number {
            width: 52px;
            height: 52px;
            background: #EFF6FF;
            color: #2563EB;
            font-size: 1.6rem;
            font-weight: 800;
            border-radius: 60px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
        }
        .step-card h4 {
            font-size: 1.3rem;
            margin-bottom: 12px;
        }
        .changelog {
            padding: 80px 0;
            background: white;
        }
        .changelog-timeline {
            max-width: 800px;
            margin: 0 auto;
        }
        .changelog-item {
            background: #F8FAFE;
            border-radius: 32px;
            padding: 28px;
            margin-bottom: 24px;
            transition: all 0.2s;
        }
        .version-badge {
            display: inline-block;
            background: #2563EB;
            color: white;
            padding: 4px 14px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.85rem;
        }
        .changelog-item .date {
            color: #64748B;
            font-size: 0.85rem;
            margin: 8px 0 12px;
        }
        .changelog-item ul {
            list-style: none;
            margin-top: 16px;
        }
        .changelog-item li {
            margin-bottom: 10px;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .tag {
            font-size: 0.7rem;
            padding: 2px 8px;
            border-radius: 30px;
            font-weight: 500;
        }
        .tag-new { background: #22C55E20; color: #15803D; }
        .tag-improve { background: #F59E0B20; color: #B45309; }
        .tag-fix { background: #EF444420; color: #B91C1C; }
        .system-requirements {
            padding: 80px 0;
            background: #F8FAFE;
        }
        .req-grid {
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: center;
        }
        .req-card {
            background: white;
            border-radius: 32px;
            flex: 1;
            min-width: 280px;
            overflow: hidden;
            box-shadow: 0 4px 12px rgba(0,0,0,0.02);
            border: 1px solid #E9EEF3;
        }
        .req-card-header {
            padding: 24px 24px 12px;
            display: flex;
            align-items: center;
            gap: 16px;
            border-bottom: 1px solid #EDF2F7;
        }
        .os-icon svg {
            width: 40px;
            height: 40px;
            fill: #2563EB;
        }
        .req-card-body {
            padding: 24px;
        }
        .req-list {
            list-style: none;
        }
        .req-list li {
            display: flex;
            justify-content: space-between;
            margin-bottom: 14px;
            font-size: 0.9rem;
        }
        .req-label {
            font-weight: 500;
            color: #1E293B;
        }
        .req-value {
            color: #475569;
        }
        .faq {
            padding: 80px 0;
            background: white;
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: #F8FAFE;
            border-radius: 24px;
            margin-bottom: 16px;
            border: 1px solid #EFF3F8;
            transition: 0.2s;
        }
        .faq-question {
            padding: 20px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
        }
        .faq-question h4 {
            font-size: 1.05rem;
        }
        .toggle-icon svg {
            width: 22px;
            height: 22px;
            fill: #2563EB;
            transition: transform 0.2s;
        }
        .faq-item.active .toggle-icon svg {
            transform: rotate(45deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            padding: 0 24px;
            color: #475569;
            border-top: 0px solid transparent;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 24px 24px;
            border-top: 1px solid #E2E8F0;
        }
        .download-cta {
            padding: 70px 0;
            background: linear-gradient(135deg, #0F172A 0%, #1E3A8A 100%);
            text-align: center;
            color: white;
        }
        .cta-content h2 {
            font-size: 2rem;
            margin-bottom: 16px;
        }
        .cta-content p {
            max-width: 540px;
            margin: 0 auto 28px;
            opacity: 0.9;
        }
        .cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .btn-lg {
            padding: 12px 32px;
            font-size: 1rem;
        }
        .btn-outline-light {
            border-color: white;
            color: white;
            background: transparent;
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.1);
        }
        footer {
            background: #0F172A;
            color: #CBD5E1;
            padding: 56px 0 32px;
        }
        .footer-grid {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 40px;
            margin-bottom: 48px;
        }
        .footer-brand p {
            max-width: 260px;
            margin-top: 16px;
            font-size: 0.85rem;
        }
        .footer-links h4 {
            color: white;
            margin-bottom: 18px;
        }
        .footer-links ul {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 12px;
        }
        .footer-links a {
            color: #94A3B8;
            text-decoration: none;
            font-size: 0.85rem;
        }
        .footer-links a:hover { color: #60A5FA; }
        .footer-bottom {
            border-top: 1px solid #1E293B;
            padding-top: 28px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            font-size: 0.8rem;
        }
        @media (max-width: 768px) {
            .download-hero h1 { font-size: 2.2rem; }
            .header-content nav { display: none; }
            .header-actions .btn-outline { display: none; }
            .platform-cards { gap: 20px; }
            .platform-card { min-width: 180px; }
            .req-list li { flex-direction: column; gap: 4px; }
        }