/* ===== 变量与基础 ===== */
:root{
  --primary:#FF6B35;
  --primary-deep:#F0521E;
  --primary-soft:#FFF1EA;
  --dark:#20242E;
  --text:#434A57;
  --text-light:#6E7684;
  --border:#E8EAF0;
  --bg:#F7F8FB;
  --card:#FFFFFF;
  --radius:16px;
  --shadow:0 4px 16px rgba(32,36,46,.06);
  --shadow-hover:0 14px 30px rgba(255,107,53,.16);
  --nav-h:68px;
}
*{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:1.65;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{text-decoration:none;color:inherit}
ul{list-style:none}
button{font:inherit;border:none;background:none;cursor:pointer}
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:84px 0}

/* ===== 按钮 ===== */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;font-weight:600;white-space:nowrap;transition:all .25s ease}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,107,53,.35)}
.btn-outline{background:#fff;color:var(--primary);border:1.5px solid var(--primary)}
.btn-outline:hover{background:var(--primary-soft);transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,107,53,.18)}
.btn-lg{font-size:17px;padding:14px 30px}
.btn-nav{font-size:14px;padding:8px 18px;margin-left:8px}

/* ===== 顶部导航 ===== */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--border);transition:box-shadow .25s ease}
.nav.scrolled{box-shadow:0 6px 20px rgba(32,36,46,.08)}
.nav-inner{display:flex;align-items:center;gap:16px;height:var(--nav-h)}
.logo{font-size:22px;font-weight:800;color:var(--dark);letter-spacing:1px}
.logo span{color:var(--primary)}
.nav-menu{margin-left:auto;display:flex;align-items:center;gap:2px}
.nav-menu a{font-size:15px;color:var(--text);padding:8px 12px;border-radius:8px;transition:all .2s ease}
.nav-menu a:hover,.nav-menu a.active{color:var(--primary);background:var(--primary-soft)}
.nav-menu a.active{font-weight:600}

/* ===== 首屏 Hero ===== */
.hero{position:relative;overflow:hidden;padding:72px 0 84px;background:linear-gradient(180deg,var(--primary-soft),var(--bg) 78%)}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;background:rgba(255,107,53,.08)}
.hero::before{width:420px;height:420px;top:-140px;right:-120px}
.hero::after{width:300px;height:300px;bottom:-120px;left:-80px;background:rgba(255,107,53,.06)}
.hero-inner{position:relative;display:flex;align-items:center;gap:56px}
.hero-copy{flex:1}
.hero h1{display:flex;align-items:center;gap:14px;flex-wrap:wrap;font-size:44px;line-height:1.25;color:var(--dark)}
.ver{display:inline-block;padding:4px 14px;border-radius:999px;background:var(--primary);color:#fff;font-size:16px;font-weight:700;letter-spacing:1px}
.hero-desc{margin:22px 0 32px;max-width:560px;font-size:17px;color:var(--text)}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-img{flex:0 0 auto;width:340px}
.hero-img img{width:100%;border-radius:var(--radius);box-shadow:0 20px 44px rgba(32,36,46,.18)}

/* ===== 模块标题 ===== */
.sec-head{text-align:center;margin-bottom:44px}
.sec-head h2{font-size:32px;color:var(--dark)}
.sec-head p{margin-top:10px;font-size:15px;color:var(--text-light)}

/* ===== 作品预览 ===== */
.works-grid,.feature-grid,.review-grid{display:grid;gap:22px}
.works-grid{grid-template-columns:repeat(4,1fr)}
.work-card{border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.work-card img{width:100%;transition:transform .45s ease}
.work-card:hover img{transform:scale(1.04)}

/* ===== 卡片通用 ===== */
.feature-card,.review-card,.version-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius)}
.work-card,.feature-card,.review-card,.mini-card{transition:transform .3s ease,box-shadow .3s ease}
.work-card:hover,.feature-card:hover,.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.mini-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}

/* ===== 产品介绍 ===== */
.intro{background:var(--card)}
.intro-grid{display:grid;grid-template-columns:1.25fr 1fr;gap:48px;align-items:center}
.intro-text p{margin-bottom:16px;font-size:16px;color:var(--text)}
.intro-cards{display:flex;flex-direction:column;gap:16px}
.mini-card{display:flex;align-items:center;gap:18px;padding:20px 22px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius)}
.mini-card:hover{background:#fff}
.mini-num{font-size:26px;font-weight:800;color:var(--primary)}
.mini-card h3{font-size:17px;color:var(--dark);margin-bottom:4px}
.mini-card p{font-size:14px;color:var(--text-light)}

/* ===== 核心功能 ===== */
.feature-grid{grid-template-columns:repeat(3,1fr)}
.feature-card{padding:30px 26px}
.f-icon{display:inline-flex;align-items:center;justify-content:center;width:52px;height:52px;margin-bottom:18px;border-radius:14px;background:var(--primary-soft);color:var(--primary)}
.f-icon svg{width:26px;height:26px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.feature-card h3{font-size:18px;color:var(--dark);margin-bottom:10px}
.feature-card p{font-size:14.5px;color:var(--text-light)}

/* ===== 优势对比 ===== */
.compare{background:var(--card)}
.compare-wrap{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.compare-row{display:grid;grid-template-columns:160px 1fr 1fr;align-items:center}
.compare-row.head{background:var(--dark)}
.compare-row.head .cell{font-weight:700;font-size:15px;color:#fff}
.cell{padding:15px 20px;font-size:14.5px;border-top:1px solid var(--border)}
.compare-row:first-child .cell{border-top:none}
.c-label{font-weight:600;color:var(--dark);background:#F4F5F8}
.c-main{font-weight:600;color:var(--primary-deep);background:var(--primary-soft)}
.c-other{color:var(--text-light)}
.ok,.no{font-style:normal;font-weight:700;margin-right:6px}
.ok{color:var(--primary)}
.no{color:#ADB3BF}

/* ===== 平台数据 ===== */
.data{background:var(--dark)}
.data .sec-head h2{color:#fff}
.data .sec-head p{color:#A7ADBA}
.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.data-item{padding:32px 20px;text-align:center;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:var(--radius);transition:transform .3s ease}
.data-item:hover{transform:translateY(-6px)}
.d-num{display:block;font-size:42px;font-weight:800;line-height:1.2;color:var(--primary)}
.d-label{display:block;margin-top:10px;font-size:14px;color:#B9BEC9}

/* ===== 用户评价 ===== */
.review-grid{grid-template-columns:repeat(3,1fr)}
.review-card{padding:24px}
.r-head{display:flex;align-items:center;gap:14px;margin-bottom:14px}
.avatar{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:46px;height:46px;border-radius:50%;color:#fff;font-size:19px;font-weight:700}
.review-card:nth-child(1) .avatar{background:#FF6B35}
.review-card:nth-child(2) .avatar{background:#4C7CF0}
.review-card:nth-child(3) .avatar{background:#22B573}
.review-card:nth-child(4) .avatar{background:#9B6BFF}
.review-card:nth-child(5) .avatar{background:#F05E7B}
.review-card:nth-child(6) .avatar{background:#12A8C8}
.r-info{display:flex;flex-direction:column;gap:2px}
.r-name{font-size:16px;font-weight:700;color:var(--dark)}
.r-stars{font-size:14px;letter-spacing:2px;color:#FFB020}
.review-card p{font-size:14.5px;color:var(--text)}

/* ===== 版本更新 ===== */
.version{background:var(--card)}
.version-card{max-width:820px;margin:0 auto;padding:40px;box-shadow:var(--shadow)}
.v-top{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:26px}
.v-badge{padding:4px 12px;border-radius:999px;background:var(--primary-soft);color:var(--primary-deep);font-size:13px;font-weight:700}
.v-num{font-size:30px;font-weight:800;color:var(--dark)}
.v-date{margin-left:auto;font-size:14px;color:var(--text-light)}
.v-log li{position:relative;padding-left:22px;margin-bottom:14px;font-size:15px;color:var(--text)}
.v-log li:last-child{margin-bottom:0}
.v-log li::before{content:"";position:absolute;left:0;top:9px;width:8px;height:8px;border-radius:50%;background:var(--primary)}

/* ===== FAQ ===== */
.faq-list{max-width:820px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden;transition:box-shadow .3s ease}
.faq-item.open{box-shadow:var(--shadow)}
.faq-q{display:flex;align-items:center;justify-content:space-between;gap:16px;width:100%;padding:18px 22px;font-size:16px;font-weight:600;color:var(--dark);text-align:left}
.faq-icon{position:relative;flex-shrink:0;width:20px;height:20px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--primary);border-radius:2px;transition:transform .3s ease}
.faq-icon::before{left:1px;right:1px;top:9px;height:2px}
.faq-icon::after{top:1px;bottom:1px;left:9px;width:2px}
.faq-item.open .faq-icon::after{transform:rotate(90deg);opacity:0}
.faq-a{max-height:0;overflow:hidden;transition:max-height .35s ease}
.faq-a p{padding:0 22px 20px;font-size:14.5px;color:var(--text)}

/* ===== 下载区域 ===== */
.download{text-align:center;background:linear-gradient(180deg,var(--primary-soft),var(--bg) 85%)}
.dl-title{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;font-size:38px;color:var(--dark)}
.dl-meta{margin:18px 0 30px;font-size:14px;color:var(--text-light)}
.dl-btns{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.dl-tip{margin-top:26px;font-size:15px;color:var(--text)}

/* ===== 底部版权 ===== */
.footer{padding:30px 0;text-align:center;background:var(--dark)}
.footer p{font-size:14px;color:#A7ADBA}
.f-link{font-weight:600;color:#fff}
.f-link:hover{color:var(--primary)}

/* ===== 返回顶部 ===== */
.to-top{position:fixed;right:26px;bottom:30px;z-index:99;width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;font-size:20px;line-height:1;box-shadow:0 8px 20px rgba(255,107,53,.4);opacity:0;visibility:hidden;transform:translateY(10px);transition:all .3s ease}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.to-top:hover{background:var(--primary-deep);transform:translateY(-3px)}

/* ===== 响应式 ===== */
@media (max-width:1024px){
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .review-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:38px}
  .hero-img{width:300px}
  .nav-menu a{font-size:14px;padding:8px 9px}
}
@media (max-width:992px){
  .nav-menu{display:none}
  .btn-nav{margin-left:auto}
  .section{padding:64px 0}
  .intro-grid{grid-template-columns:1fr;gap:32px}
  .data-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px){
  .container{padding:0 20px}
  .hero{padding:48px 0 56px}
  .hero-inner{flex-direction:column;gap:36px;text-align:center}
  .hero h1{font-size:30px;justify-content:center}
  .hero-desc{margin:18px auto 26px;font-size:15.5px}
  .hero-btns{flex-direction:column;width:100%}
  .hero-btns .btn{width:100%}
  .hero-img{width:min(320px,72%)}
  .sec-head h2{font-size:26px}
  .works-grid{grid-template-columns:1fr}
  .feature-grid{grid-template-columns:1fr}
  .review-grid{grid-template-columns:1fr}
  .compare-row{grid-template-columns:1fr 1fr}
  .compare-row.head{display:none}
  .c-label{grid-column:1/-1;background:#F4F5F8}
  .cell{padding:12px 14px;font-size:13.5px}
  .version-card{padding:26px 20px}
  .v-date{margin-left:0}
  .dl-title{font-size:28px}
  .dl-meta{font-size:12px;white-space:nowrap}
  .dl-btns{flex-direction:column;width:100%}
  .dl-btns .btn{width:100%}
  .to-top{right:16px;bottom:20px}
}