.index_main {
    position: relative;
    width: 100%;
    min-height: 200px;
    display: block;
    margin: 0 auto;
    overflow: hidden; 
}
        :root {
            --primary: #4876FF;
            --primary-hover: #3b60d4;
            --text-main: #1A1A1A;
            --text-sub: #666666;
            --bg-light: #F8FAFC;
            --bg-hero: linear-gradient(180deg, #EBF1FF 0%, #FFFFFF 100%);
            --white: #FFFFFF;
            --border-color: #E5E7EB;
        }

        /* 主视觉区 (Hero) */
        .hero { background: var(--bg-hero); padding: 160px 0 120px; min-height: 85vh; display: flex; align-items: center; overflow: hidden; }
        .hero-inner { display: flex; align-items: center; justify-content: space-between; gap: 40px; width: 100%; }
        .hero-text { flex: 1; max-width: 600px; }
        .tag { display: inline-flex; align-items: center; gap: 6px; background: rgba(72, 118, 255, 0.1); color: var(--primary); padding: 6px 16px; border-radius: 20px; font-size: 14px; font-weight: 600; margin-bottom: 24px; }
        .hero-title { display: block; font-size: 46px; font-weight: 800; margin-bottom: 20px; line-height: 1.25; color: #111827; }
        .hero p { font-size: 16px; color: var(--text-sub); margin-bottom: 40px; line-height: 1.8; }
        
        /* 下载按钮组 (突出 Windows，不要二维码) */
        .download-group { display: flex; flex-direction: column; gap: 20px; }
        .btn-main { display: inline-flex; align-items: center; gap: 16px; background: var(--primary); color: var(--white); padding: 16px 40px; border-radius: 12px; transition: all 0.3s ease; width: max-content; box-shadow: 0 8px 24px rgba(72, 118, 255, 0.25); }
        .btn-main:hover { background: var(--primary-hover); transform: translateY(-3px); box-shadow: 0 12px 30px rgba(72, 118, 255, 0.35); }
        .btn-main svg { width: 32px; height: 32px; fill: currentColor; }
        .btn-main-text { display: flex; flex-direction: column; text-align: left; }
        .btn-main-text .sm { font-size: 13px; opacity: 0.9; }
        .btn-main-text .lg { font-size: 20px; font-weight: 800; letter-spacing: 0.5px; }
        
        .sub-downloads { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; }
        .sub-downloads-label { font-size: 14px; color: #9CA3AF; }
        .btn-sub { display: inline-flex; align-items: center; gap: 8px; padding: 10px 24px; background: var(--white); border: 1px solid var(--border-color); border-radius: 8px; font-size: 14px; font-weight: 600; color: #4B5563; transition: all 0.3s; box-shadow: 0 2px 4px rgba(0,0,0,0.02); }
        .btn-sub:hover { border-color: var(--primary); color: var(--primary); background: #F5F8FF; }
        .btn-sub svg { width: 20px; height: 20px; fill: currentColor; }

        .hero-img { flex: 1; display: flex; justify-content: center; align-items: center; position: relative; perspective: 1000px; }
        
        /* 重新设计的精美右侧主图 (纯CSS + 内联SVG) */
        .tech-illustration { position: relative; width: 450px; height: 450px; display: flex; align-items: center; justify-content: center; }
        @keyframes float { 0% { transform: translateY(0px); } 50% { transform: translateY(-20px); } 100% { transform: translateY(0px); } }
        @keyframes pulseGlow { 0% { transform: scale(1); opacity: 0.6; } 100% { transform: scale(1.15); opacity: 0.2; } }
        @keyframes spin { 100% { transform: translate(-50%, -50%) rotate(360deg); } }
        
        .glow-orb { position: absolute; width: 280px; height: 280px; background: radial-gradient(circle, rgba(72,118,255,0.5) 0%, rgba(72,118,255,0) 70%); border-radius: 50%; filter: blur(20px); animation: pulseGlow 4s infinite alternate; }
        .orbit { position: absolute; border: 1px dashed rgba(72,118,255,0.4); border-radius: 50%; top: 50%; left: 50%; transform: translate(-50%, -50%); }
        .orbit-1 { width: 340px; height: 340px; animation: spin 25s linear infinite; }
        .orbit-2 { width: 440px; height: 440px; animation: spin 35s linear infinite reverse; border-style: dotted; border-width: 2px; opacity: 0.6; }
        
        .center-shield-card { position: relative; z-index: 10; background: rgba(255, 255, 255, 0.85); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border: 1px solid rgba(255,255,255,0.6); padding: 35px 40px; border-radius: 28px; box-shadow: 0 24px 48px rgba(72,118,255,0.12), inset 0 0 0 1px rgba(255,255,255,0.5); display: flex; flex-direction: column; align-items: center; animation: float 6s ease-in-out infinite; }
        .shield-icon { width: 88px; height: 88px; filter: drop-shadow(0 12px 20px rgba(37,99,235,0.4)); margin-bottom: 20px; }
        .shield-text { font-weight: 800; color: var(--primary); font-size: 20px; letter-spacing: 2px; text-shadow: 0 2px 4px rgba(0,0,0,0.05); }
        
        .float-chat { position: absolute; background: var(--white); padding: 14px 20px; border-radius: 18px; box-shadow: 0 12px 30px rgba(0,0,0,0.08); display: flex; align-items: center; gap: 12px; z-index: 12; border: 1px solid rgba(255,255,255,0.9); }
        .chat-1 { top: 15%; left: -5%; animation: float 5s ease-in-out infinite 1s; }
        .chat-dot { width: 36px; height: 36px; border-radius: 50%; background: linear-gradient(135deg, #A78BFA, #8B5CF6); box-shadow: 0 4px 10px rgba(139,92,246,0.3); }
        .chat-line-group { display: flex; flex-direction: column; gap: 8px; }
        .chat-line { height: 8px; background: #F3F4F6; border-radius: 4px; width: 68px; }
        .chat-line.short { width: 45px; }
        
        .chat-2 { bottom: 20%; right: -10%; animation: float 7s ease-in-out infinite 2s; background: linear-gradient(135deg, #3B82F6, #2563EB); color: var(--white); padding: 14px 24px; box-shadow: 0 12px 30px rgba(37,99,235,0.3); border: none; }
        .chat-2 svg { width: 22px; height: 22px; fill: var(--white); }
        .chat-2 span { font-weight: 600; font-size: 15px; }
        
        .tech-dot { position: absolute; border-radius: 50%; }
        .dot-1 { width: 14px; height: 14px; top: 12%; right: 12%; background: var(--primary); box-shadow: 0 0 12px var(--primary); animation: float 4s infinite alternate; }
        .dot-2 { width: 10px; height: 10px; bottom: 15%; left: 10%; background: #10B981; box-shadow: 0 0 12px #10B981; animation: float 3s infinite alternate 1.5s; }
        .dot-3 { width: 18px; height: 18px; top: 45%; right: -12%; background: #F59E0B; box-shadow: 0 0 15px #F59E0B; animation: float 5s infinite alternate 0.5s; }

        /* 头像网格中心区 */
        .avatar-section { padding: 120px 0; background: linear-gradient(180deg, #F9FAFB 0%, #FFFFFF 100%); }
        .avatar-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 16px; grid-auto-rows: 100px; max-width: 1100px; margin: 0 auto; }
        .avatar-box { border-radius: 16px; display: flex; align-items: center; justify-content: center; color: var(--white); overflow: hidden; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1); box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
        .avatar-box:hover { transform: translateY(-6px) scale(1.03); box-shadow: 0 16px 32px rgba(0,0,0,0.12); z-index: 10; }
        .avatar-box svg { width: 44px; height: 44px; fill: currentColor; opacity: 0.95; transition: transform 0.4s; }
        .avatar-box:hover svg { transform: scale(1.15); }
        
        /* 中间文字卡片占据多行多列 */
        .center-card { grid-column: 3 / 7; grid-row: 2 / 5; background: var(--white); border-radius: 32px; padding: 50px; display: flex; flex-direction: column; justify-content: center; align-items: center; text-align: center; box-shadow: 0 24px 50px rgba(72,118,255,0.08); border: 1px solid rgba(72,118,255,0.05); transition: all 0.4s ease; z-index: 5; }
        .center-card:hover { transform: translateY(-4px); box-shadow: 0 32px 64px rgba(72,118,255,0.12); }
        .center-card h2 { font-size: 38px; line-height: 1.4; color: #111827; margin-bottom: 24px; font-weight: 900; letter-spacing: 1px; }
        .center-card .slogan { display: inline-block; font-size: 18px; color: var(--primary); font-weight: 800; letter-spacing: 8px; padding: 12px 40px; background: #EEF2FF; border-radius: 40px; text-transform: uppercase; box-shadow: inset 0 0 0 1px rgba(72,118,255,0.1); }

        /* 特性区 */
        .features { padding: 100px 0; background: var(--white); }
        .section-header { text-align: center; margin-bottom: 60px; }
        .section-header h2 { font-size: 36px; font-weight: 800; color: #111827; margin-bottom: 16px; }
        .section-header p { font-size: 16px; color: var(--text-sub); }
        
        .feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        .feature-card { background: var(--white); border: 1px solid #F3F4F6; border-radius: 20px; padding: 40px 30px; text-align: center; transition: all 0.3s; box-shadow: 0 4px 6px rgba(0,0,0,0.02); }
        .feature-card:hover { transform: translateY(-5px); box-shadow: 0 20px 40px rgba(0,0,0,0.08); border-color: transparent; }
        .icon-wrap { width: 72px; height: 72px; border-radius: 20px; margin: 0 auto 24px; display: flex; align-items: center; justify-content: center; }
        .icon-wrap svg { width: 36px; height: 36px; fill: currentColor; }
        .feature-card h3 { font-size: 20px; font-weight: 700; color: #111827; margin-bottom: 12px; }
        .feature-card p { font-size: 14px; color: var(--text-sub); margin-bottom: 24px; line-height: 1.6; }
        .feature-card .link { font-size: 14px; color: var(--primary); font-weight: 600; display: inline-flex; align-items: center; gap: 4px; }
        
        /* 手机预览区 */
        .mockups { padding: 100px 0; background: #F9FAFB; }
        .mockup-container { display: flex; justify-content: center; gap: 40px; margin-top: 60px; flex-wrap: wrap; }
        .phone { width: 280px; height: 580px; background: var(--white); border-radius: 40px; border: 10px solid #E5E7EB; box-shadow: 0 25px 50px rgba(0,0,0,0.1); position: relative; overflow: hidden; }
        .phone::before { content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 120px; height: 24px; background: #E5E7EB; border-bottom-left-radius: 12px; border-bottom-right-radius: 12px; z-index: 10; }
        .phone-screen { padding: 40px 20px 20px; height: 100%; display: flex; flex-direction: column; background: #F3F4F6; }
        .phone-title { font-size: 16px; font-weight: 700; text-align: center; margin-bottom: 20px; color: #111827; }
        .msg-bubble { padding: 12px 16px; border-radius: 16px; font-size: 13px; max-width: 85%; margin-bottom: 16px; line-height: 1.5; }
        .msg-left { background: var(--white); align-self: flex-start; border-bottom-left-radius: 4px; color: #374151; box-shadow: 0 1px 2px rgba(0,0,0,0.05); }
        .msg-right { background: var(--primary); align-self: flex-end; border-bottom-right-radius: 4px; color: var(--white); box-shadow: 0 1px 2px rgba(72,118,255,0.2); }

        /* FAQ区 */
        .faq { padding: 100px 0; background: var(--white); }
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
        .faq-item { border: 1px solid #E5E7EB; border-radius: 16px; padding: 24px; transition: all 0.3s; background: #F9FAFB; }
        .faq-item:hover { border-color: var(--primary); background: var(--white); box-shadow: 0 10px 30px rgba(72,118,255,0.08); transform: translateY(-2px); }
        .faq-question { font-size: 18px; font-weight: 700; color: #111827; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
        .faq-question::before { content: 'Q'; color: var(--primary); font-size: 20px; font-weight: 900; }
        .faq-answer { font-size: 15px; color: var(--text-sub); line-height: 1.7; padding-left: 24px; }
        
        /* 页脚 */
        .footer { padding: 40px 0; text-align: center; border-top: 1px solid #E5E7EB; background: #F9FAFB; color: var(--text-sub); font-size: 14px; }

        /* 响应式 */
        @media (max-width: 1024px) {
            .hero-inner { flex-direction: column; text-align: center; }
            .hero-text { max-width: 100%; display: flex; flex-direction: column; align-items: center; }
            .btn-main-text { text-align: center; }
            .sub-downloads { justify-content: center; }
            .tech-illustration { transform: scale(0.8); margin-top: 20px; }
            .avatar-grid { display: none; /* 移动端隐藏复杂的网格，或简化显示 */ }
            .feature-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .hero-title { font-size: 36px; }
            .tech-illustration { transform: scale(0.65); margin-top: 0; }
            .feature-grid { grid-template-columns: 1fr; }
            .mockup-container { gap: 20px; }
            .phone { width: 100%; max-width: 320px; }
        }


.download-section{padding: 50px 0px;}
        .dl-row { display: flex; justify-content: center; gap: 20px; margin-bottom: 40px; flex-wrap: wrap; }
        .dl-item { display: flex; flex-direction: column; align-items: center; justify-content: center; width: 180px; padding: 25px 20px; border: 1px solid #E5E7EB; border-radius: 8px; text-decoration: none; background: #ffffff; box-sizing: border-box; }
        .dl-tag { display: inline-block; background: #4876FF; color: #ffffff; font-size: 12px; padding: 2px 10px; border-radius: 10px; margin-bottom: 10px; line-height: 1.2; }
        .dl-name { display: block; font-size: 18px; font-weight: bold; color: #1F2937; margin-bottom: 15px; }
        .dl-btn { display: inline-block; padding: 8px 24px; border-radius: 4px; font-size: 14px; background: #E5E7EB; color: #1F2937; }
        .win-active { border: 2px solid #4876FF; background: #F5F8FF; }
        .win-active .dl-name { color: #4876FF; margin-bottom: 15px; }
        .win-active .dl-btn { background: #4876FF; color: #ffffff; }
        @media (max-width: 768px) { .dl-item { width: 100%; max-width: 300px; } }