/* 裁音魔方 · 页面样式（自 index.html 抽取，修改后请同步对应页面） */
        /* ===== 新版首页专属样式（导航/页脚/按钮/定价沿用 index.css 全站样式） ===== */
        :root { --text-muted: #9E9E9E; --info-blue: #4FC3F7; }
        html { scroll-behavior: smooth; }
        body.no-scroll { overflow: hidden; }
        #features, #how-it-works, #pricing, #faq, #demo, #download, #tech { scroll-margin-top: 90px; }

        /* Hero：居中单列版（覆盖 index.css 的两列布局） */
        .hero { padding: 150px 0 40px; background: radial-gradient(circle at 50% 10%, rgba(76,175,80,0.12) 0%, transparent 60%), var(--darker-bg); }
        .hero .container { max-width: 1200px; }
        .hero-content { max-width: 1100px; margin: 0 auto; text-align: center; display: block; grid-template-columns: none; gap: 0; }
        .hero-text { text-align: center; max-width: none; }
        .hero-text h1 { font-size: 52px; font-weight: 700; line-height: 1.25; margin-bottom: 24px; color: #FFFFFF; letter-spacing: -1px; background: none; background-clip: initial; -webkit-background-clip: initial; -webkit-text-fill-color: #FFFFFF; }
        .hero-text h1 .highlight { color: var(--primary); -webkit-text-fill-color: var(--primary); }
        .hero-text p { font-size: 17px; color: var(--text-secondary); max-width: 820px; margin: 0 auto 40px; line-height: 1.7; }
        .hero-buttons { display: flex; gap: 20px; justify-content: center; flex-wrap: wrap; margin-top: 0; }
        .hero-buttons .btn { padding: 16px 38px; font-size: 16px; border-radius: 16px; }
        .hero-visual { display: none; }

        /* Demo 演示区（静态波形图，参考新版首页PC） */
        .demo-section { padding: 40px 0 80px; }
        .demo-card {
            background: #1A1A1A;
            border: 1px solid rgba(79,195,247, 0.3);
            border-radius: 16px;
            padding: 30px;
            box-shadow: 0 8px 24px rgba(0,0,0,0.4);
            max-width: 1100px;
            margin: 0 auto;
        }
        .demo-header { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; font-weight: 600; font-size: 18px; color: #4FC3F7; }
        .demo-tag { font-size: 11px; background: rgba(79,195,247,0.15); color: #4FC3F7; padding: 2px 10px; border-radius: 20px; font-weight: 500; }
        .demo-subtitle { font-size: 13px; color: var(--text-muted); margin-bottom: 22px; }

        .track-list { display: flex; flex-direction: column; gap: 12px; }
        .track-row { background: #222; padding: 14px 20px; border-radius: 16px; display: flex; align-items: center; gap: 16px; }
        .track-btn { background: #333; border: none; color: white; width: 38px; height: 38px; border-radius: 50%; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: 0.24s; flex-shrink: 0; }
        .track-btn:hover { background: var(--primary); }
        .track-btn.playing { background: var(--primary); }
        .track-info { display: flex; flex-direction: column; min-width: 110px; }
        .track-info h3 { font-size: 15px; margin-bottom: 2px; font-weight: 600; }
        .track-info span { font-size: 12px; color: var(--text-muted); }
        .track-spectrum { flex: 1; display: flex; align-items: center; height: 40px; overflow: hidden; opacity: 0.7; transition: opacity 0.24s; }
        .track-row:hover .track-spectrum { opacity: 1; }
        .track-spectrum.active { opacity: 1; }
        .track-spectrum canvas { width: 100%; height: 100%; display: block; cursor: pointer; }

        /* 多端下载 */
        .download-section { padding: 40px 0 80px; background: var(--darker-bg); }
        .download-box {
            background: linear-gradient(135deg, rgba(76,175,80,0.05), rgba(79,195,247,0.03));
            border: 1px solid var(--card-border);
            border-radius: 16px;
            padding: 40px;
            max-width: 1100px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 30px;
        }
        .download-box-title { flex: 1; }
        .download-box-title h3 { font-size: 22px; margin-bottom: 8px; font-weight: 600; }
        .download-box-title h3 i { color: #4FC3F7; margin-right: 8px; }
        .download-box-title p { color: var(--text-secondary); font-size: 15px; line-height: 1.7; }
        .download-entries { display: flex; gap: 16px; flex-wrap: wrap; justify-content: center; }
        .entry-item { position: relative; display: flex; flex-direction: column; align-items: center; gap: 10px; cursor: pointer; padding: 8px; transition: 0.24s; min-width: 80px; }
        .entry-icon { width: 56px; height: 56px; background: rgba(76,175,80,0.1); border-radius: 16px; display: flex; align-items: center; justify-content: center; transition: 0.24s; }
        .entry-item:hover .entry-icon { background: rgba(76,175,80,0.2); transform: translateY(-2px); }
        .entry-icon i { font-size: 26px; color: var(--primary); transition: 0.24s; }
        .entry-item span { font-size: 14px; color: var(--text-secondary); transition: 0.24s; }
        .entry-item:hover span { color: var(--primary); }
        .entry-item.core .entry-icon { border: 2px solid rgba(76,175,80,0.5); }
        .entry-popup { position: absolute; bottom: 90px; left: 50%; transform: translateX(-50%); background: var(--card-bg); border: 1px solid var(--primary); border-radius: 16px; padding: 12px; width: 150px; z-index: 100; opacity: 0; visibility: hidden; transition: 0.24s; box-shadow: 0 10px 30px rgba(0,0,0,0.5); pointer-events: none; }
        .entry-item:hover .entry-popup { opacity: 1; visibility: visible; }
        .entry-popup::after { content: ''; position: absolute; bottom: -6px; left: 50%; transform: translateX(-50%); border-width: 6px 6px 0; border-style: solid; border-color: var(--primary) transparent transparent transparent; }
        .qr-mock { width: 100%; aspect-ratio: 1/1; background: #111; border: 1px dashed #555; border-radius: 8px; display: flex; align-items: center; justify-content: center; color: #555; font-size: 24px; margin-bottom: 6px; }
                .entry-popup .qr-img { width: 100%; height: auto; display: block; margin-bottom: 6px; border-radius: 8px; }
        .entry-popup p { font-size: 11px; color: var(--text-secondary); text-align: center; margin: 0; }
        .qr-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0,0,0,0.8); z-index: 2000; display: none; align-items: center; justify-content: center; backdrop-filter: blur(5px); }
        .qr-modal.active { display: flex; }
        .qr-modal-content { background: var(--card-bg); border: 1px solid var(--primary); border-radius: 16px; padding: 30px; text-align: center; width: 90%; max-width: 320px; position: relative; }
        .qr-modal-close { position: absolute; top: 12px; right: 12px; background: none; border: none; color: var(--text-secondary); font-size: 22px; cursor: pointer; }
        .qr-modal-content h4 { margin-bottom: 16px; font-size: 16px; }
        .qr-modal-content .qr-mock { width: 200px; height: 200px; margin: 0 auto 12px; font-size: 50px; }
        .qr-modal-content p { font-size: 13px; color: var(--text-secondary); }

        /* 核心业务卡片（点击跳转到对应功能页） */
        .service-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
        .service-card-link { display: block; }
        .service-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px; padding: 32px 24px; text-align: center; transition: 0.24s; position: relative; height: 100%; display: flex; flex-direction: column; justify-content: flex-start; }
        .service-card-link:hover .service-card { border-color: var(--primary); transform: translateY(-3px); box-shadow: 0 16px 32px rgba(76,175,80,0.12); }
        .service-card .icon { width: 60px; height: 60px; background: rgba(76,175,80,0.12); border-radius: 16px; display: flex; align-items: center; justify-content: center; margin: 0 auto 20px; font-size: 28px; color: var(--primary); }
        .service-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 10px; }
        .service-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; margin-bottom: 20px; }
        .service-card .badge-wrap { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; margin-top: auto; }
        .trust-tag { display: inline-block; font-size: 12px; color: var(--primary-light); background: rgba(76,175,80,0.1); padding: 4px 12px; border-radius: 20px; }
        .trust-tag.core-tag { color: #FFD54F; background: rgba(255,213,79,0.12); }

        /* 产品优势 */
        .advantage-section { background: var(--dark-bg); border-top: 1px solid var(--card-border); border-bottom: 1px solid var(--card-border); }
        .advantage-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
        .advantage-text h2 { font-size: 32px; margin-bottom: 30px; }
        .advantage-text ul { list-style: none; }
        .advantage-text ul li { margin-bottom: 24px; display: flex; gap: 15px; }
        .advantage-text ul li i { color: var(--primary); font-size: 20px; margin-top: 4px; }
        .advantage-text ul li h3 { font-size: 18px; font-weight: 600; margin-bottom: 6px; color: var(--text-primary); }
        .advantage-text ul li p { color: var(--text-secondary); font-size: 15px; line-height: 1.7; }
        .advantage-img { background: linear-gradient(135deg, rgba(76,175,80,0.08), rgba(79,195,247,0.05)); border: 1px solid var(--card-border); border-radius: 16px; padding: 50px 40px; text-align: center; }
        .advantage-img i { font-size: 60px; color: var(--primary); margin-bottom: 20px; }
        .advantage-img h3 { font-size: 22px; font-weight: 600; margin-bottom: 12px; }
        .advantage-img p { color: var(--text-secondary); font-size: 14px; line-height: 1.7; }

        /* 用户评价 */
        .testimonial-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .testimonial-card { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: 16px; padding: 24px; }
        .testimonial-card .quote { font-size: 14px; color: var(--text-secondary); margin-bottom: 15px; line-height: 1.8; }
        .testimonial-card .user { display: flex; align-items: center; gap: 12px; }
        .testimonial-card .avatar { width: 40px; height: 40px; background: #333; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: #666; font-size: 18px; }
        .testimonial-card .info h4 { font-size: 14px; font-weight: 600; }
        .testimonial-card .info span { font-size: 13px; color: var(--text-muted); }

        /* 工作流 */
        .workflow { background: rgba(255,255,255,0.02); border-top: 1px solid rgba(79,195,247, 0.1); border-bottom: 1px solid rgba(79,195,247, 0.1); }
        .workflow-steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
        /* 显式覆盖 index.css 中分离页 .step 的 display:flex（类名同名冲突导致横向变形） */
        .step { display: block; text-align: center; padding: 20px; }
        .step .num { display: inline-flex; align-items: center; justify-content: center; width: 48px; height: 48px; background: var(--gradient); border-radius: 50%; color: white; font-weight: 700; font-size: 20px; margin-bottom: 16px; line-height: 1; }
        .step h3 { font-size: 20px; font-weight: 500; margin-bottom: 8px; }
        .step p { color: var(--text-secondary); font-size: 15px; }

        /* FAQ */
        .faq-section { max-width: 800px; margin: 0 auto; padding: 0 20px; }
        .faq-item { border: 1px solid var(--card-border); border-radius: 16px; margin-bottom: 12px; background: var(--card-bg); overflow: hidden; }
        .faq-q { width: 100%; text-align: left; background: none; border: none; color: var(--text-primary); font-size: 16px; font-weight: 500; padding: 20px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; transition: 0.24s; }
        .faq-q:hover { color: var(--primary); }
        .faq-q i { transition: transform 0.24s; }
        .faq-item.active .faq-q i { transform: rotate(180deg); }
        .faq-a { max-height: 0; overflow: hidden; transition: max-height 0.4s ease; padding: 0 20px; }
        .faq-item.active .faq-a { max-height: 400px; padding-bottom: 20px; }
        .faq-a p { color: var(--text-secondary); font-size: 14px; line-height: 1.8; }

        /* CTA */
        .cta-section { padding: 80px 0; text-align: center; background: linear-gradient(180deg, var(--darker-bg), rgba(18,18,18,0.9)); border-top: 1px solid var(--card-border); }
        .cta-section h2 { font-size: 36px; font-weight: 700; }
        .cta-section p { color: var(--text-secondary); max-width: 580px; margin: 12px auto 28px; line-height: 1.7; }
        .cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

        /* 返回顶部 */
        .back-to-top { position: fixed; bottom: 30px; right: 30px; background: var(--primary); color: white; width: 45px; height: 45px; border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; border: none; opacity: 0; visibility: hidden; transition: all 0.24s; z-index: 999; }
        .back-to-top.visible { opacity: 1; visibility: visible; }

        /* 响应式 */
        @media (max-width: 1024px) {
            .workflow-steps { grid-template-columns: 1fr; }
            .advantage-grid { grid-template-columns: 1fr; }
            .testimonial-grid { grid-template-columns: 1fr; }
            .download-box { flex-direction: column; text-align: center; }
        }
        @media (max-width: 768px) {
            .hero-text h1 { font-size: 34px; letter-spacing: -0.5px; }
            .track-row { flex-wrap: wrap; gap: 12px; }
            .track-info { flex: 0 0 100%; }
            .track-spectrum { flex: 1; min-width: 150px; }
        }
        @media (max-width: 640px) {
            .service-grid { grid-template-columns: 1fr; }
            .hero-text h1 { font-size: 30px; line-height: 1.3; }
            .hero-text p { font-size: 15px; }
            .hero-buttons .btn { padding: 12px 28px; font-size: 15px; width: 100%; max-width: 260px; justify-content: center; }
            .service-card p { font-size: 13px; }
            .download-box { padding: 24px; }
            .entry-popup { display: none; }
        }