:root{
  --primary:#FF7A45;
  --primary-deep:#F0602A;
  --primary-soft:#FFF1E9;
  --dark:#332B27;
  --text:#4A423D;
  --text-light:#7D726B;
  --border:#F1E4DA;
  --bg:#FFF9F4;
  --card:#FFFFFF;
  --radius:16px;
  --shadow-card:0 4px 14px rgba(60,40,25,.06);
  --shadow-hover:0 12px 26px rgba(255,122,69,.18);
  --header-h:66px;
  --container-w:1200px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Segoe UI",sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
ul{list-style:none}
.container{max-width:var(--container-w);margin:0 auto;padding:0 24px}
section{padding:76px 0}
.section-title{font-size:32px;font-weight:800;color:var(--dark);text-align:center;letter-spacing:1px}
.section-sub{font-size:15px;color:var(--text-light);text-align:center;margin:10px 0 44px}

.header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.header.scrolled{box-shadow:0 4px 18px rgba(60,40,25,.08)}
.header-inner{max-width:var(--container-w);margin:0 auto;height:var(--header-h);padding:0 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.logo{font-size:24px;font-weight:800;color:var(--dark);letter-spacing:1px;white-space:nowrap;line-height:1.4}
.logo span{color:var(--primary)}
.nav{display:flex;align-items:center;gap:2px}
.nav a{padding:7px 11px;font-size:14px;color:var(--text);border-radius:8px;transition:color .2s,background .2s;white-space:nowrap}
.nav a:hover{color:var(--primary);background:var(--primary-soft)}
.btn-download{font-size:13px;font-weight:600;color:#fff;background:var(--primary);padding:7px 16px;border-radius:999px;transition:background .2s,transform .2s;white-space:nowrap;line-height:1.5}
.btn-download:hover{background:var(--primary-deep);transform:translateY(-1px)}

.hero{padding:calc(var(--header-h) + 56px) 0 76px;background:linear-gradient(180deg,var(--primary-soft) 0%,var(--bg) 100%)}
.hero-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:center}
.hero-text h1{font-size:40px;font-weight:800;color:var(--dark);line-height:1.35;letter-spacing:1px}
.hero-text h1 span{color:var(--primary)}
.hero-text h1 em,.download h1 em{font-style:normal;font-weight:700;color:var(--primary-deep);vertical-align:middle}
.hero-text h1 em{font-size:20px;margin-left:10px}
.hero-desc{margin:20px 0 26px;font-size:16px;color:var(--text);line-height:1.9;max-width:560px}
.hero-badges{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 30px}
.hero-badge{display:inline-flex;align-items:center;gap:6px;padding:7px 14px;border-radius:999px;background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow-card);font-size:13px;font-weight:600;color:var(--text)}
.hero-badge svg{width:15px;height:15px;color:var(--primary-deep);flex-shrink:0}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap}
.hero-img img{width:100%;border-radius:var(--radius);box-shadow:var(--shadow-card);border:1px solid var(--border)}

.btn-primary{display:inline-block;padding:14px 32px;border-radius:999px;background:var(--primary);color:#fff;font-size:16px;font-weight:600;text-align:center;transition:background .2s,transform .25s,box-shadow .25s}
.btn-primary:hover{background:var(--primary-deep);transform:translateY(-2px);box-shadow:0 10px 22px rgba(255,122,69,.35)}

.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.work-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-card);transition:transform .28s,box-shadow .28s}
.work-card img{width:100%}
.work-card:hover,.feature-card:hover,.data-card:hover,.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}

.intro-card{max-width:920px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:42px;box-shadow:var(--shadow-card);transition:box-shadow .28s}
.intro-card:hover{box-shadow:var(--shadow-hover)}
.intro-card p{font-size:15px;color:var(--text);line-height:2;margin-bottom:16px}
.intro-tags{display:flex;flex-wrap:wrap;gap:10px}
.intro-tags span{font-size:13px;font-weight:600;color:var(--primary-deep);background:var(--primary-soft);border:1px solid var(--border);padding:6px 16px;border-radius:999px}

.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.feature-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:30px 26px;box-shadow:var(--shadow-card);transition:transform .28s,box-shadow .28s}
.feature-icon{width:52px;height:52px;border-radius:14px;background:var(--primary-soft);color:var(--primary-deep);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{font-size:18px;font-weight:700;color:var(--dark);margin-bottom:8px}
.feature-card p{font-size:14px;color:var(--text-light);line-height:1.8}

.compare-wrap{max-width:980px;margin:0 auto}
.compare-table{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-card)}
.compare-row{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr}
.compare-row + .compare-row{border-top:1px solid var(--border)}
.compare-row.head{background:var(--primary-soft)}
.compare-cell{padding:16px 14px;font-size:14px;color:var(--text);display:flex;align-items:center;justify-content:center;text-align:center}
.compare-row.head .compare-cell{font-weight:700;color:var(--dark)}
.compare-row.head .compare-cell:first-child{justify-content:flex-start}
.compare-row:not(.head) .compare-cell:first-child{font-weight:600;color:var(--dark);justify-content:flex-start}
.compare-cell.hl{color:var(--primary-deep);font-weight:700}

.data-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.data-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:34px 18px;text-align:center;box-shadow:var(--shadow-card);transition:transform .28s,box-shadow .28s}
.data-num{font-size:40px;font-weight:800;color:var(--primary);line-height:1.2}
.data-label{font-size:14px;color:var(--text-light);margin-top:8px}

.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.review-card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow-card);transition:transform .28s,box-shadow .28s}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.review-avatar{width:46px;height:46px;border-radius:50%;background:var(--primary);color:#fff;font-size:18px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-size:15px;font-weight:600;color:var(--dark)}
.review-stars{font-size:14px;color:#FFB300;letter-spacing:3px}
.review-text{font-size:14px;color:var(--text);line-height:1.9}

.version-card{max-width:780px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow-card)}
.version-head h3{font-size:22px;font-weight:800;color:var(--dark)}
.version-badge{display:inline-block;vertical-align:middle;margin-left:10px;font-size:12px;font-weight:600;color:#fff;background:var(--primary);padding:3px 12px;border-radius:999px}
.version-date{font-size:14px;color:var(--text-light);margin:8px 0 22px}
.version-list li{position:relative;padding-left:24px;font-size:15px;color:var(--text);line-height:1.8;margin-bottom:12px}
.version-list li::before{content:"";position:absolute;left:2px;top:9px;width:9px;height:9px;border-radius:50%;background:var(--primary)}

.faq-list{max-width:780px;margin:0 auto;display:flex;flex-direction:column;gap:14px}
.faq-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow-card)}
.faq-item summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:18px 22px;font-size:16px;font-weight:600;color:var(--dark);user-select:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:22px;font-weight:400;color:var(--primary);line-height:1;transition:transform .25s;flex-shrink:0}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-answer{padding:0 22px 20px;font-size:14px;color:var(--text);line-height:1.9}

.download{padding:84px 0;background:linear-gradient(180deg,var(--primary-soft) 0%,var(--bg) 70%);text-align:center}
.download h1{font-size:34px;font-weight:800;color:var(--dark);letter-spacing:1px}
.download h1 span{color:var(--primary)}
.download h1 em{font-size:18px;margin-left:8px}
.download-meta{font-size:14px;color:var(--text-light);margin:14px 0 30px}
.download-btns{display:flex;gap:18px;justify-content:center;flex-wrap:wrap}
.download-btns .btn-primary{padding:15px 38px}
.download-tip{margin-top:26px;font-size:15px;color:var(--text)}

.footer{border-top:1px solid var(--border);background:var(--card);padding:28px 0;text-align:center;font-size:14px;color:var(--text-light)}
.footer a{color:var(--primary);font-weight:600;text-decoration:none}
.footer a:hover{color:var(--primary-deep)}

.back-top{position:fixed;right:24px;bottom:28px;z-index:90;width:46px;height:46px;border-radius:50%;border:none;background:var(--primary);color:#fff;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(255,122,69,.4);opacity:0;visibility:hidden;transform:translateY(10px);transition:opacity .3s,visibility .3s,transform .3s,background .2s}
.back-top.show{opacity:1;visibility:visible;transform:translateY(0)}
.back-top:hover{background:var(--primary-deep)}

@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)}
  .data-grid{grid-template-columns:repeat(2,1fr)}
  .hero h1{font-size:34px}
  .hero-inner{gap:40px}
  .nav a{padding:7px 8px;font-size:13px}
  .compare-cell{padding:14px 10px;font-size:13px}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .header-inner{padding:0 20px}
  .nav{display:none}
  .logo{font-size:22px}
  .hero{padding:calc(var(--header-h) + 34px) 0 48px}
  .hero-inner{grid-template-columns:1fr;gap:30px}
  .hero-text h1{font-size:28px}
  .hero-text h1 em{font-size:16px}
  .hero-desc{font-size:15px;margin-top:16px}
  .hero-btns{flex-direction:column;width:100%}
  .hero-btns .btn-primary{width:100%}
  .works-grid{grid-template-columns:1fr}
  .features-grid{grid-template-columns:1fr}
  .data-grid{grid-template-columns:repeat(2,1fr);gap:14px}
  .reviews-grid{grid-template-columns:1fr}
  .compare-row{grid-template-columns:.9fr 1fr 1fr 1fr}
  .compare-cell{padding:12px 6px;font-size:12px}
  .download-btns{flex-direction:column;width:100%}
  .download-btns .btn-primary{width:100%}
  .download h1{font-size:26px}
  .download-meta{font-size:12px;white-space:nowrap}
  section{padding:54px 0}
  .section-title{font-size:26px}
  .section-sub{margin:8px 0 32px;font-size:14px}
  .intro-card{padding:26px 20px}
  .version-card{padding:28px 20px}
  .faq-item summary{padding:16px;font-size:15px}
  .faq-answer{padding:0 16px 18px}
  .download{padding:64px 0}
}