:root{
  --primary:#4F6EF7;
  --primary-dark:#3B56D6;
  --primary-light:#EDF1FF;
  --accent:#FF6B9D;
  --dark:#1B2240;
  --text:#252B3B;
  --text-2:#5C6478;
  --bg:#F6F8FD;
  --card:#FFFFFF;
  --border:#E7EBF5;
  --radius:16px;
  --radius-sm:10px;
  --shadow:0 6px 20px rgba(79,110,247,.08);
  --shadow-hover:0 16px 36px rgba(79,110,247,.16);
  --ok:#22B07D;
  --no:#EF5A5A;
  --nav-h:64px;
  --grad-primary:linear-gradient(135deg,var(--primary),var(--primary-dark));
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px)}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}
section[id]{scroll-margin-top:calc(var(--nav-h) + 12px)}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.88);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 4px 18px rgba(27,34,64,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:var(--nav-h)}
.nav-logo{font-size:20px;font-weight:800;letter-spacing:.5px;color:var(--text)}
.nav-links{display:flex;gap:20px}
.nav-links a{font-size:14px;color:var(--text-2);position:relative;padding:6px 2px;transition:color .25s}
.nav-links a:hover{color:var(--primary)}
.nav-links a.active{color:var(--primary);font-weight:600}
.nav-links a.active::after{content:"";position:absolute;left:50%;bottom:-2px;transform:translateX(-50%);width:16px;height:3px;border-radius:2px;background:var(--primary)}
.nav-btn{display:inline-flex;align-items:center;justify-content:center;height:26px;padding:0 12px;font-size:13px;font-weight:600;color:#fff;background:var(--grad-primary);border-radius:999px;transition:transform .25s,box-shadow .25s}
.nav-btn:hover{box-shadow:0 6px 16px rgba(79,110,247,.35);transform:translateY(-1px)}

.hero{position:relative;padding:calc(var(--nav-h) + 60px) 0 76px;background:linear-gradient(180deg,#EDF1FF 0%,var(--bg) 62%);overflow:hidden}
.hero::before{content:"";position:absolute;top:-130px;right:-90px;width:440px;height:440px;border-radius:50%;background:radial-gradient(circle,rgba(255,107,157,.16),transparent 70%);pointer-events:none}
.hero::after{content:"";position:absolute;bottom:-140px;left:-100px;width:460px;height:460px;border-radius:50%;background:radial-gradient(circle,rgba(79,110,247,.16),transparent 70%);pointer-events:none}
.hero-inner{position:relative;display:grid;grid-template-columns:1.15fr .85fr;gap:48px;align-items:center}
.hero h1{font-size:44px;line-height:1.3;font-weight:800;margin-bottom:20px;letter-spacing:1px}
.ver{display:inline-block;margin-left:10px;padding:3px 12px;font-size:15px;font-weight:700;color:var(--primary);background:var(--card);border:1px solid #DCE4FF;border-radius:999px;vertical-align:6px;white-space:nowrap}
.hero-desc{font-size:17px;color:var(--text-2);max-width:560px;margin-bottom:34px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 30px;font-size:16px;font-weight:600;border-radius:999px;border:none;cursor:pointer;transition:transform .25s,box-shadow .25s;text-align:center;white-space:nowrap}
.btn-primary{color:#fff;background:var(--grad-primary);box-shadow:0 8px 20px rgba(79,110,247,.25)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(79,110,247,.35)}
.btn-ghost{color:var(--primary-dark);background:var(--card);border:1.5px solid var(--primary)}
.btn-ghost:hover{background:var(--primary-light);transform:translateY(-2px)}
.btn-lg{padding:16px 36px;font-size:17px}
.hero-img{justify-self:center}
.hero-img img{width:300px;height:auto;border-radius:18px;box-shadow:0 24px 60px rgba(79,110,247,.22);border:6px solid var(--card);background:var(--primary-light)}

.section{padding:84px 0}
.section-alt{background:var(--card)}
.section-title{font-size:32px;font-weight:800;text-align:center;margin-bottom:12px;letter-spacing:.5px}
.section-title.left{text-align:left}
.section-sub{text-align:center;color:var(--text-2);margin-bottom:48px}

.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.work-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:12px;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.work-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.work-card img{width:100%;height:auto;border-radius:var(--radius-sm);background:var(--primary-light)}

.intro-inner{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.intro-text p{color:var(--text-2);margin-bottom:14px;font-size:15.5px}
.intro-text p:last-child{margin-bottom:0}
.intro-list{display:flex;flex-direction:column;gap:16px}
.intro-item{display:flex;gap:14px;align-items:flex-start;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.intro-item:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.intro-ico{width:42px;height:42px;border-radius:12px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;flex-shrink:0}
.intro-ico svg{width:22px;height:22px}
.intro-item h3{font-size:16px;margin-bottom:4px}
.intro-item p{font-size:14px;color:var(--text-2)}

.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;text-align:center;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.feature-ico{width:60px;height:60px;margin:0 auto 18px;border-radius:18px;display:flex;align-items:center;justify-content:center;color:var(--primary);background:linear-gradient(135deg,var(--primary-light),#FDFDFF)}
.feature-ico svg{width:28px;height:28px}
.feature-card h3{font-size:18px;margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-2)}

.compare-wrap{max-width:960px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.compare-table{width:100%;table-layout:fixed;border-collapse:collapse}
.compare-table th,.compare-table td{padding:16px 18px;text-align:center;border-bottom:1px solid var(--border);font-size:15px}
.compare-table th{background:var(--primary-light);color:var(--text);font-size:16px;font-weight:700}
.compare-table th:first-child,.compare-table td:first-child{text-align:left}
.compare-table tr:last-child td{border-bottom:none}
.compare-table td.label{color:var(--text);font-weight:600;background:#FAFBFE}
.ok{color:var(--ok);font-weight:600}
.no{color:var(--no);font-weight:600}

.stats{background:linear-gradient(135deg,var(--dark) 0%,#2B3560 100%);padding:84px 0}
.stats .section-title{color:#fff}
.stats .section-sub{color:#B9C2E8}
.stats-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:24px}
.stat-item{text-align:center}
.stat-num{font-size:34px;font-weight:800;color:#fff;display:block;margin-bottom:6px;letter-spacing:.5px}
.stat-label{font-size:14px;color:#B9C2E8}

.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}
.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;font-weight:700;flex-shrink:0;background:linear-gradient(135deg,var(--primary),var(--accent))}
.review-card:nth-child(2) .review-avatar{background:linear-gradient(135deg,#4FB8F7,#4F6EF7)}
.review-card:nth-child(3) .review-avatar{background:linear-gradient(135deg,#FF8A5C,#FF6B9D)}
.review-card:nth-child(4) .review-avatar{background:linear-gradient(135deg,#34C7A0,#4F9DF7)}
.review-card:nth-child(5) .review-avatar{background:linear-gradient(135deg,#9B6BF7,#FF6B9D)}
.review-card:nth-child(6) .review-avatar{background:linear-gradient(135deg,#5F7CF0,#8A5CF7)}
.review-name{font-size:15px;font-weight:600;color:var(--text)}
.review-stars{color:#FFB400;font-size:14px;letter-spacing:2px}
.review-text{font-size:14px;color:var(--text-2)}

.update-card{max-width:820px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:36px;box-shadow:var(--shadow)}
.update-head{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-bottom:20px;padding-bottom:20px;border-bottom:1px dashed var(--border)}
.update-ver{display:inline-block;padding:5px 16px;font-size:15px;font-weight:700;color:#fff;background:var(--grad-primary);border-radius:999px}
.update-time{font-size:14px;color:var(--text-2)}
.update-list{list-style:none;display:flex;flex-direction:column;gap:12px}
.update-list li{position:relative;padding-left:24px;font-size:15px;color:var(--text-2)}
.update-list li::before{content:"";position:absolute;left:4px;top:9px;width:8px;height:8px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--accent))}

.faq-wrap{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;transition:box-shadow .3s}
.faq-item.open{box-shadow:var(--shadow-hover)}
.faq-q{display:flex;justify-content:space-between;align-items:center;gap:16px;width:100%;padding:20px 24px;background:none;border:none;cursor:pointer;font-size:16px;font-weight:600;color:var(--text);text-align:left;font-family:inherit}
.faq-arrow{flex-shrink:0;width:26px;height:26px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;transition:transform .3s}
.faq-arrow svg{width:14px;height:14px}
.faq-item.open .faq-arrow{transform:rotate(180deg)}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .35s ease}
.faq-item.open .faq-a{grid-template-rows:1fr}
.faq-a-inner{overflow:hidden}
.faq-a p{padding:0 24px 22px;font-size:15px;color:var(--text-2)}

.download{padding:84px 0;background:linear-gradient(180deg,var(--bg) 0%,#EDF1FF 100%)}
.download-card{max-width:760px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:24px;padding:56px 40px;text-align:center;box-shadow:var(--shadow)}
.download h1{font-size:34px;font-weight:800;margin-bottom:16px;letter-spacing:1px}
.download-meta{font-size:14px;color:var(--text-2);margin-bottom:32px}
.download-btns{display:flex;justify-content:center;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.download-tip{font-size:14px;color:var(--text-2);background:var(--primary-light);border:1px dashed #C9D5FF;border-radius:999px;padding:10px 20px;display:inline-block}

.footer{background:var(--dark);color:#AEB6D6;padding:36px 0;text-align:center}
.footer-brand{display:inline-block;font-size:18px;font-weight:800;color:#fff;margin-bottom:10px}
.footer-copy{font-size:13px}
.footer-link{color:#CFD6F5}
.footer-link:hover{color:#fff}

.to-top{position:fixed;right:28px;bottom:32px;width:46px;height:46px;border-radius:50%;border:none;cursor:pointer;background:var(--grad-primary);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 10px 24px rgba(79,110,247,.35);opacity:0;visibility:hidden;transform:translateY(12px);transition:all .3s;z-index:99}
.to-top svg{width:20px;height:20px}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{transform:translateY(-3px)}

@media (max-width:1024px){
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(3,1fr);row-gap:40px}
  .intro-inner{gap:40px}
  .hero h1{font-size:38px}
}
@media (max-width:900px){
  .nav-links{display:none}
  .intro-inner{grid-template-columns:1fr;gap:36px}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .section{padding:60px 0}
  .section-title{font-size:26px}
  .section-sub{margin-bottom:36px}
  .hero{padding:calc(var(--nav-h) + 32px) 0 52px}
  .hero-inner{grid-template-columns:1fr;gap:36px;text-align:center}
  .hero h1{font-size:28px}
  .hero-desc{max-width:none;margin:0 auto 26px;font-size:15px}
  .hero-btns{flex-direction:column;width:100%}
  .hero-btns .btn{width:100%;padding:14px 20px;font-size:15px}
  .hero-img img{width:100%;max-width:300px;margin:0 auto}
  .works-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:1fr}
  .reviews-grid{grid-template-columns:1fr}
  .stats{padding:60px 0}
  .stats-grid{grid-template-columns:repeat(2,1fr);row-gap:36px}
  .stat-num{font-size:28px}
  .compare-table th,.compare-table td{padding:12px 8px;font-size:14px}
  .download{padding:60px 0}
  .download-card{padding:40px 20px}
  .download h1{font-size:26px}
  .download-meta{font-size:12px;white-space:nowrap}
  .download-btns{flex-direction:column}
  .download-btns .btn{width:100%}
  .btn-lg{padding:14px 20px;font-size:15px}
  .update-card{padding:28px 20px}
  .faq-q{font-size:15px;padding:18px 18px}
  .faq-a p{padding:0 18px 20px;font-size:14px}
  .to-top{right:16px;bottom:20px;width:42px;height:42px}
}
@media (max-width:480px){
  .nav-logo{font-size:18px}
  .nav-btn{height:24px;padding:0 10px;font-size:12px}
  .hero h1{font-size:24px}
  .ver{margin-left:6px;padding:2px 10px;font-size:14px}
}