*{margin:0;padding:0;box-sizing:border-box}:root{--primary:#29a9eb;--primary-dark:#1e8fcf;--dark:#1a2b3c;--gray:#667;--light:#f5f9fc;--white:#fff;--radius:12px;--shadow:0 6px 24px rgba(41,169,235,0.12);--transition:0.3s ease}html{scroll-behavior:smooth}body{font-family:'Noto Sans SC',-apple-system,"Microsoft YaHei",sans-serif;color:var(--dark);line-height:1.7;background:var(--white)}a{text-decoration:none;color:inherit}ul{list-style:none}img,svg{max-width:100%}.container{max-width:1160px;margin:0 auto;padding:0 20px}.container-narrow{max-width:820px}.skip-link{position:absolute;left:-999px;top:0;background:var(--primary);color:#fff;padding:10px 18px;z-index:2000;border-radius:0 0 8px 0}.skip-link:focus{left:0}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--primary);outline-offset:2px}.header{position:sticky;top:0;background:rgba(255,255,255,0.96);backdrop-filter:blur(10px);box-shadow:0 2px 12px rgba(0,0,0,0.06);z-index:1000}.header-inner{display:flex;align-items:center;justify-content:space-between;height:68px}.logo{display:flex;align-items:center;gap:10px;font-size:1.25rem;font-weight:700;color:var(--dark)}.logo svg{transition:transform var(--transition)}.logo:hover svg{transform:rotate(-15deg) scale(1.1)}.nav-desktop{display:flex;gap:6px}.nav-desktop a{padding:8px 16px;border-radius:8px;font-weight:500;color:var(--gray);transition:var(--transition)}.nav-desktop a:hover{color:var(--primary);background:var(--light)}.nav-desktop a.active{color:var(--primary);background:rgba(41,169,235,0.1)}.menu-toggle{display:none;flex-direction:column;justify-content:space-between;width:28px;height:20px;background:none;border:none;cursor:pointer}.menu-toggle span{display:block;height:3px;width:100%;background:var(--dark);border-radius:3px;transition:var(--transition)}.menu-toggle.open span:nth-child(1){transform:translateY(8.5px) rotate(45deg)}.menu-toggle.open span:nth-child(2){opacity:0}.menu-toggle.open span:nth-child(3){transform:translateY(-8.5px) rotate(-45deg)}.drawer-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.4);opacity:0;visibility:hidden;transition:var(--transition);z-index:1100}.drawer-overlay.open{opacity:1;visibility:visible}.drawer{position:fixed;top:0;right:-300px;width:280px;height:100%;background:var(--white);box-shadow:-4px 0 24px rgba(0,0,0,0.15);transition:right var(--transition);z-index:1200}.drawer.open{right:0}.drawer-header{display:flex;align-items:center;justify-content:space-between;padding:20px;border-bottom:1px solid #eee;font-weight:700}.drawer-close{background:none;border:none;font-size:1.4rem;cursor:pointer;color:var(--gray);width:32px;height:32px;display:flex;align-items:center;justify-content:center}.drawer-nav{padding:12px}.drawer-nav a{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:8px;color:var(--dark);font-weight:500;transition:var(--transition)}.drawer-nav a:hover{background:var(--light);color:var(--primary)}.drawer-nav a svg{flex-shrink:0}.hero{background:linear-gradient(135deg,#e8f5fd 0%,#f5f9fc 100%);padding:70px 0;overflow:hidden}.hero-inner{display:flex;align-items:center;gap:40px}.hero-text{flex:1}.hero-text h1{font-size:2.6rem;line-height:1.3;margin-bottom:20px}.hero-text h1 span{color:var(--primary)}.hero-text p{font-size:1.1rem;color:var(--gray);margin-bottom:30px;max-width:520px}.hero-btns{display:flex;gap:16px;flex-wrap:wrap}.hero-img{flex:0 0 auto;display:flex;justify-content:center}.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:50px;font-weight:500;font-size:1rem;cursor:pointer;transition:var(--transition);border:2px solid transparent}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 18px rgba(41,169,235,0.35)}.btn-primary:hover{background:var(--primary-dark);transform:translateY(-3px)}.btn-outline{background:transparent;color:var(--primary);border-color:var(--primary)}.btn-outline:hover{background:var(--primary);color:#fff;transform:translateY(-3px)}.btn-small{padding:8px 20px;font-size:0.9rem;background:var(--primary);color:#fff}.btn-small:hover{background:var(--primary-dark)}.btn-large{padding:16px 40px;font-size:1.15rem}section{padding:70px 0}.section-title{text-align:center;font-size:2rem;margin-bottom:12px}.section-sub{text-align:center;color:var(--gray);margin-bottom:40px}.platforms{background:var(--white)}.platform-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:24px}.platform-card{background:var(--light);padding:34px 24px;border-radius:var(--radius);text-align:center;transition:var(--transition);border:1px solid transparent}.platform-card:hover{transform:translateY(-8px);box-shadow:var(--shadow);border-color:var(--primary);background:var(--white)}.platform-card svg{margin-bottom:16px}.platform-card h3{margin-bottom:8px}.platform-card p{color:var(--gray);margin-bottom:18px;font-size:0.95rem}.features{background:var(--light)}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:26px}.feature-card{background:var(--white);padding:32px;border-radius:var(--radius);transition:var(--transition)}.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}.feature-icon{width:60px;height:60px;border-radius:16px;background:linear-gradient(135deg,var(--primary),var(--primary-dark));display:flex;align-items:center;justify-content:center;margin-bottom:18px}.feature-card h3{margin-bottom:10px}.feature-card p{color:var(--gray)}.cta{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;text-align:center}.cta h2{font-size:2rem;margin-bottom:12px}.cta p{margin-bottom:30px;opacity:0.9}.cta .btn-primary{background:#fff;color:var(--primary)}.cta .btn-primary:hover{background:#f0f0f0}.page-hero{background:linear-gradient(135deg,#e8f5fd,#f5f9fc);padding:50px 0;text-align:center}.page-hero h1{font-size:2.3rem;margin-bottom:14px}.page-hero p{color:var(--gray);max-width:660px;margin:0 auto}.breadcrumb{font-size:0.9rem;color:var(--gray);margin-bottom:20px}.breadcrumb a{color:var(--primary)}.breadcrumb span{margin:0 6px}.download-section{background:var(--white)}.download-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:30px;max-width:820px;margin:0 auto}.download-card{background:var(--white);border:1px solid #e6eef4;border-radius:var(--radius);padding:40px 30px;text-align:center;transition:var(--transition)}.download-card:hover{box-shadow:var(--shadow);transform:translateY(-6px)}.download-card>svg{margin-bottom:16px}.download-card h3{margin-bottom:20px}.dl-info{text-align:left;margin-bottom:24px;display:inline-block}.dl-info li{color:var(--gray);margin-bottom:8px}.steps-section{background:var(--light)}.steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:24px}.step{background:var(--white);padding:30px 24px;border-radius:var(--radius);text-align:center;position:relative;transition:var(--transition)}.step:hover{transform:translateY(-6px);box-shadow:var(--shadow)}.step-num{width:48px;height:48px;border-radius:50%;background:var(--primary);color:#fff;font-size:1.3rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}.step h3{margin-bottom:8px}.step p{color:var(--gray);font-size:0.95rem}.faq-section{background:var(--white)}.faq-list{display:flex;flex-direction:column;gap:14px}.faq-item{background:var(--white);border:1px solid #e6eef4;border-radius:var(--radius);overflow:hidden;transition:var(--transition)}.faq-item[open]{box-shadow:var(--shadow);border-color:var(--primary)}.faq-item summary{padding:20px 24px;font-weight:500;font-size:1.05rem;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}.faq-item summary::-webkit-details-marker{display:none}.faq-item summary::after{content:'+';font-size:1.6rem;color:var(--primary);transition:var(--transition)}.faq-item[open] summary::after{transform:rotate(45deg)}.faq-answer{padding:0 24px 22px;color:var(--gray);animation:fadeDown 0.4s ease}.faq-answer strong{color:var(--primary-dark)}@keyframes fadeDown{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}.footer{background:var(--dark);color:#cbd5e0;padding-top:50px}.footer-inner{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:34px;padding-bottom:40px}.footer-col h4{color:#fff;margin-bottom:16px}.footer-col a{display:block;color:#cbd5e0;margin-bottom:10px;transition:var(--transition)}.footer-col a:hover{color:var(--primary)}.footer-col p{color:#9fb0c0;font-size:0.95rem}.footer-bottom{border-top:1px solid rgba(255,255,255,0.1);text-align:center;padding:20px;font-size:0.9rem;color:#8a99a8}.fade-in{opacity:0;transform:translateY(30px);transition:opacity 0.6s ease,transform 0.6s ease;animation:forceShow 0s linear 3s forwards}.fade-in.visible{opacity:1;transform:translateY(0);animation:none}@keyframes forceShow{to{opacity:1;transform:none}}html:not(.js) .fade-in{opacity:1;transform:none;animation:none}.float-anim{animation:float 4s ease-in-out infinite}@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-18px)}}@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:0.01ms!important;transition-duration:0.01ms!important}.fade-in{opacity:1;transform:none}}@media (max-width:860px){.nav-desktop{display:none}.menu-toggle{display:flex}.hero-inner{flex-direction:column-reverse;text-align:center}.hero-text p{margin-left:auto;margin-right:auto}.hero-btns{justify-content:center}.hero-text h1{font-size:2.1rem}section{padding:50px 0}}@media (max-width:480px){.hero-text h1{font-size:1.7rem}.section-title{font-size:1.6rem}.btn{padding:11px 22px;font-size:0.95rem}}