/* ========== 变量 ========== */
:root{
  --primary:#2E6BFF;
  --primary-strong:#1B52E0;
  --primary-soft:#EAF1FF;
  --dark:#0E1C38;
  --text:#1B2537;
  --text-2:#5A6579;
  --line:#E3E9F2;
  --bg:#FFFFFF;
  --bg-soft:#F5F8FC;
  --radius:14px;
  --shadow-sm:0 2px 10px rgba(14,28,56,.05);
  --shadow:0 8px 24px rgba(14,28,56,.08);
  --shadow-hover:0 14px 32px rgba(46,107,255,.14);
  --nav-h:64px;
}

/* ========== 基础 ========== */
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,sans-serif;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;line-height:1.6}
img{display:block;max-width:100%;height:auto}
a{text-decoration:none}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px}
section{scroll-margin-top:calc(var(--nav-h) + 8px)}
.wrap{max-width:1180px;margin:0 auto;padding:0 24px}

/* ========== 导航栏 ========== */
.navbar{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);transition:box-shadow .2s}
.navbar.scrolled{box-shadow:var(--shadow-sm)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;gap:14px;height:var(--nav-h)}
.logo{display:flex;align-items:center;gap:8px;font-size:22px;font-weight:800;color:var(--dark);line-height:1;white-space:nowrap}
.logo-mark{width:22px;height:22px;border-radius:7px;background:linear-gradient(135deg,var(--primary),#7AA7FF);display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}
.nav-menu{display:flex;gap:2px}
.nav-menu a{font-size:14px;color:var(--text-2);padding:6px 10px;border-radius:8px;transition:.2s}
.nav-menu a:hover{color:var(--primary);background:var(--primary-soft)}
.nav-menu a.active{color:var(--primary);font-weight:600}
.nav-btn{font-size:13px;font-weight:600;color:#fff;background:var(--primary);padding:5px 14px;border-radius:999px;line-height:1.2;transition:.2s;white-space:nowrap}
.nav-btn:hover{background:var(--primary-strong);transform:translateY(-1px)}

/* ========== 通用标题 ========== */
section{padding:72px 0}
section h2{font-size:30px;font-weight:800;color:var(--dark);text-align:center;line-height:1.3}
section h2::after{content:"";display:block;width:44px;height:4px;border-radius:2px;background:linear-gradient(90deg,var(--primary),#7AA7FF);margin:12px auto 0}
.sec-sub{text-align:center;color:var(--text-2);font-size:15px;margin-top:12px}

/* ========== Hero ========== */
.hero{background:linear-gradient(180deg,var(--primary-soft) 0%,var(--bg) 100%);padding:calc(var(--nav-h) + 52px) 0 64px}
.hero-inner{display:flex;align-items:center;gap:48px}
.hero-text{flex:1}
.hero h1{font-size:42px;font-weight:800;color:var(--dark);line-height:1.2;display:flex;align-items:center;flex-wrap:wrap;gap:12px}
.ver{font-size:17px;font-weight:700;color:var(--primary);background:var(--primary-soft);border:1px solid rgba(46,107,255,.3);padding:2px 12px;border-radius:999px;white-space:nowrap}
.hero-desc{font-size:16px;line-height:1.9;color:var(--text-2);max-width:520px;margin:18px 0 28px}
.hero-btns{display:flex;gap:14px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;font-size:15px;font-weight:600;color:#fff;background:var(--primary);padding:12px 26px;border-radius:999px;transition:.25s;text-align:center}
.btn:hover{background:var(--primary-strong);transform:translateY(-2px);box-shadow:0 10px 22px rgba(46,107,255,.3)}
.btn-ghost{background:var(--bg);color:var(--primary);border:1px solid rgba(46,107,255,.4)}
.btn-ghost:hover{background:var(--primary-soft)}
.btn-lg{font-size:16px;padding:14px 34px}
.hero-img{flex-shrink:0;width:320px}
.hero-img img{border-radius:var(--radius);box-shadow:var(--shadow)}

/* ========== 作品预览 ========== */
.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:36px}
.work-card{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-sm);transition:.25s}
.work-card img{width:100%}
.work-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}

/* ========== 产品介绍 ========== */
.product-rows{max-width:760px;margin:32px auto 0}
.product-rows p{font-size:15px;line-height:1.95;color:var(--text-2);margin-bottom:16px;text-align:center}
.product-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:24px}
.p-card{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.25s}
.p-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover);background:var(--bg)}
.p-card h3{font-size:17px;font-weight:700;color:var(--dark);margin-bottom:8px}
.p-card p{font-size:14px;line-height:1.8;color:var(--text-2)}

/* ========== 核心功能 ========== */
.features{background:var(--bg-soft)}
.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.feature-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.25s}
.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.f-icon{width:42px;height:42px;border-radius:10px;background:var(--primary-soft);display:flex;align-items:center;justify-content:center;margin-bottom:14px}
.f-icon svg{width:22px;height:22px;stroke:var(--primary)}
.feature-card h3{font-size:17px;font-weight:700;color:var(--dark);margin-bottom:8px}
.feature-card p{font-size:14px;line-height:1.8;color:var(--text-2)}

/* ========== 优势对比 ========== */
.compare-scroll{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:var(--bg);margin-top:36px;-webkit-overflow-scrolling:touch}
.compare-table{width:100%;min-width:640px;table-layout:fixed;border-collapse:separate;border-spacing:0}
.compare-table th,.compare-table td{padding:14px 16px;text-align:left;font-size:14px;border-bottom:1px solid var(--line);vertical-align:middle}
.compare-table thead th{background:var(--dark);color:#fff;font-weight:600;border-bottom:none}
.compare-table thead th:first-child{border-radius:var(--radius) 0 0 0}
.compare-table thead th:last-child{border-radius:0 var(--radius) 0 0}
.compare-table tbody tr:last-child td{border-bottom:none}
.compare-table thead th:first-child,.compare-table tbody td:first-child{position:sticky;left:0;z-index:1}
.compare-table tbody td:first-child{background:var(--bg);color:var(--dark);font-weight:600}
.compare-table tbody td:nth-child(2){background:var(--primary-soft);color:var(--dark);font-weight:600}
.compare-table tbody tr:hover td{background:var(--bg-soft)}
.compare-table tbody tr:hover td:nth-child(2){background:var(--primary-soft)}
.compare-tip{display:none;text-align:center;font-size:13px;color:var(--text-2);margin-top:12px}

/* ========== 平台数据 ========== */
.stats{background:linear-gradient(135deg,var(--dark),#14294F)}
.stats h2{color:#fff}
.stats h2::after{background:linear-gradient(90deg,#7AA7FF,#fff)}
.stats .sec-sub{color:rgba(255,255,255,.7)}
.stats-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:36px}
.stat{text-align:center;padding:8px 0}
.num{font-size:38px;font-weight:800;color:#B9D0FF;line-height:1.2}
.stat p{font-size:14px;color:rgba(255,255,255,.75);margin-top:6px}

/* ========== 用户评价 ========== */
.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:36px}
.review-card{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:22px;transition:.25s}
.review-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover)}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,var(--primary),#7AA7FF);color:#fff;font-size:17px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-meta{flex:1}
.name{font-size:15px;font-weight:700;color:var(--dark);display:block}
.stars{color:#F5A623;font-size:14px;letter-spacing:2px}
.review-text{font-size:14px;line-height:1.8;color:var(--text-2)}

/* ========== 版本更新 ========== */
.version-card{max-width:720px;margin:36px auto 0;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow-sm)}
.version-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:18px}
.ver-badge{font-size:18px;font-weight:800;color:#fff;background:var(--primary);padding:6px 16px;border-radius:999px}
.ver-date{font-size:14px;color:var(--text-2)}
.version-log{list-style:none}
.version-log li{padding:10px 0 10px 26px;position:relative;font-size:14px;line-height:1.8;color:var(--text);border-bottom:1px dashed var(--line)}
.version-log li:last-child{border-bottom:none}
.version-log li::before{content:"";position:absolute;left:4px;top:17px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ========== FAQ ========== */
.faq-list{max-width:760px;margin:36px auto 0;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:border-color .25s,box-shadow .25s}
.faq-item.open{border-color:rgba(46,107,255,.45);box-shadow:var(--shadow-sm)}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;background:none;border:none;cursor:pointer;padding:16px 18px;font-size:15px;font-weight:600;color:var(--dark);text-align:left;font-family:inherit}
.faq-icon{width:20px;height:20px;flex-shrink:0;position:relative}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--primary);border-radius:2px;transition:transform .3s}
.faq-icon::before{width:12px;height:2px;left:4px;top:9px}
.faq-icon::after{width:2px;height:12px;left:9px;top:4px}
.faq-item.open .faq-icon::after{transform:scaleY(0)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 18px 18px;font-size:14px;line-height:1.8;color:var(--text-2)}

/* ========== 下载区域 ========== */
.download{padding:80px 0}
.download-card{max-width:680px;margin:0 auto;text-align:center;background:var(--bg);border:1px solid var(--line);border-radius:20px;padding:48px 32px;box-shadow:var(--shadow);position:relative;overflow:hidden}
.download-card::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 180px at 50% 0%,var(--primary-soft),transparent);pointer-events:none}
.download-card h1{font-size:36px;font-weight:800;color:var(--dark);position:relative;display:flex;align-items:center;justify-content:center;gap:12px;flex-wrap:wrap}
.dl-meta{position:relative;font-size:14px;color:var(--text-2);margin:14px 0 26px}
.dl-btns{position:relative;display:flex;justify-content:center;gap:14px}
.dl-tip{position:relative;margin-top:22px;display:inline-block;font-size:14px;color:var(--text-2);background:var(--bg-soft);border-radius:999px;padding:10px 18px}

/* ========== 页脚 ========== */
.footer{background:var(--dark);color:rgba(255,255,255,.7);padding:26px 0;text-align:center;font-size:13px}
.footer a{color:#fff;font-weight:600}
.footer a:hover{color:#B9D0FF}

/* ========== 返回顶部 ========== */
.to-top{position:fixed;right:24px;bottom:24px;width:42px;height:42px;border-radius:50%;background:var(--primary);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 18px rgba(46,107,255,.35);opacity:0;visibility:hidden;transform:translateY(8px);transition:.25s;z-index:90}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:var(--primary-strong)}

/* ========== 响应式 ========== */
@media (max-width:1080px){
  .nav-menu a{padding:6px 7px;font-size:13px}
  .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);gap:24px 16px}
  .hero-img{width:280px}
}

@media (max-width:900px){
  .product-cards{grid-template-columns:1fr}
  .hero-inner{gap:32px}
}

@media (max-width:768px){
  .wrap{padding:0 20px}
  .nav-inner{height:56px}
  .nav-menu{display:none}
  .logo{font-size:18px}
  section{padding:56px 0}
  section h2{font-size:24px}
  .sec-sub{font-size:14px}
  .hero{padding:calc(56px + 36px) 0 44px}
  .hero-inner{flex-direction:column;text-align:center;gap:28px}
  .hero h1{font-size:32px;justify-content:center}
  .hero-desc{margin:14px auto 24px;font-size:15px}
  .hero-btns{flex-direction:column;width:100%}
  .hero-btns .btn{width:100%}
  .hero-img{width:100%;max-width:340px;margin:0 auto}
  .works-grid,.features-grid,.reviews-grid,.product-cards{grid-template-columns:1fr}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .num{font-size:30px}
  .compare-tip{display:block}
  .version-card{padding:22px 18px}
  .dl-btns{flex-direction:column}
  .dl-btns .btn{width:100%}
  .dl-meta{font-size:12px;white-space:nowrap}
  .download{padding:56px 0}
  .download-card{padding:36px 20px;border-radius:16px}
  .download-card h1{font-size:30px}
  .to-top{right:16px;bottom:16px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
}