:root{
  --primary:#FF6B35;
  --primary-dark:#F04E1F;
  --primary-light:#FFF0E8;
  --gradient:linear-gradient(135deg,#FF6B35 0%,#FF9A5C 100%);
  --dark:#1B1F2A;
  --text:#3A4154;
  --text-sub:#5A6072;
  --bg:#FFFFFF;
  --bg-gray:#F7F8FB;
  --border:#EAEDF3;
  --radius:16px;
  --shadow:0 6px 20px rgba(27,31,42,.06);
  --shadow-hover:0 14px 30px rgba(255,107,53,.16);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%;height:auto}
a{text-decoration:none;color:inherit}
ul{list-style:none}
.container{max-width:1120px;margin:0 auto;padding:0 24px}

.nav{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--border);transition:box-shadow .3s}
.nav.scrolled{box-shadow:0 4px 16px rgba(27,31,42,.08)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{font-size:24px;font-weight:800;color:var(--dark);line-height:1.25;white-space:nowrap}
.logo span{color:var(--primary)}
.nav-menu{display:flex;gap:2px}
.nav-menu a{padding:6px 10px;font-size:14px;color:var(--text-sub);border-radius:8px;transition:color .2s,background .2s}
.nav-menu a:hover{color:var(--primary);background:var(--primary-light)}
.nav-btn{font-size:13px;font-weight:700;color:#fff;background:var(--gradient);padding:6px 14px;border-radius:999px;line-height:1.4;white-space:nowrap;box-shadow:0 4px 12px rgba(255,107,53,.3);transition:transform .2s,box-shadow .2s}
.nav-btn:hover{transform:translateY(-1px);box-shadow:0 6px 16px rgba(255,107,53,.42)}

.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 26px;border-radius:999px;font-size:15px;font-weight:700;line-height:1.5;transition:transform .2s,box-shadow .2s}
.btn-primary{color:#fff;background:var(--gradient);box-shadow:0 8px 20px rgba(255,107,53,.32)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(255,107,53,.42)}
.btn-dark{color:#fff;background:var(--dark);box-shadow:0 8px 20px rgba(27,31,42,.18)}
.btn-dark:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(27,31,42,.26)}
.btn-lg{padding:16px 34px;font-size:16px}

.hero{padding:132px 0 84px;background:radial-gradient(1100px 480px at 82% -12%,rgba(255,107,53,.12),transparent 62%),linear-gradient(180deg,#FFF9F4 0%,#FFFFFF 100%)}
.hero-inner{display:flex;align-items:center;gap:56px}
.hero-text{flex:1.05}
.hero h1{font-size:46px;font-weight:800;color:var(--dark);line-height:1.25}
.hero h1 .hero-v{color:var(--primary)}
.hero-desc{font-size:16.5px;color:var(--text-sub);margin:20px 0 0;max-width:560px}
.hero-btns{display:flex;gap:16px;flex-wrap:wrap;margin-top:32px}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.hero-tags span{font-size:13px;color:var(--primary-dark);background:var(--primary-light);border:1px solid rgba(255,107,53,.18);padding:5px 14px;border-radius:999px}
.hero-img{flex:1;border-radius:20px;overflow:hidden;box-shadow:0 18px 44px rgba(255,107,53,.2);border:1px solid var(--border)}

.section{padding:84px 0}
.section-gray{background:var(--bg-gray)}
.section-title{text-align:center;font-size:34px;font-weight:800;color:var(--dark);margin-bottom:12px}
.section-sub{text-align:center;color:var(--text-sub);margin-bottom:48px}

.works-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;align-items:start}
.work-card,.feature-card,.stat-card,.review-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.work-card:hover,.feature-card:hover,.stat-card:hover,.review-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover)}
.work-card{overflow:hidden}

.intro-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:42px;box-shadow:var(--shadow);max-width:860px;margin:0 auto}
.intro-card p{font-size:16px;color:var(--text);margin-bottom:16px}
.intro-card p:last-of-type{margin-bottom:26px}
.intro-chips{display:flex;gap:12px;flex-wrap:wrap}
.intro-chips span{background:var(--primary-light);color:var(--primary-dark);font-weight:700;font-size:14px;padding:8px 18px;border-radius:999px}

.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.feature-card{padding:30px}
.feature-icon{width:52px;height:52px;border-radius:14px;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;margin-bottom:18px}
.feature-icon svg,.to-top svg{fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.feature-icon svg{width:26px;height:26px}
.feature-card h3{font-size:18px;color:var(--dark);margin-bottom:10px}
.feature-card p{font-size:14.5px;color:var(--text-sub)}

.compare-wrap{background:#fff;border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden}
.compare-table{width:100%;border-collapse:collapse;text-align:center}
.compare-table th,.compare-table td{padding:16px 18px;font-size:15px;border-bottom:1px solid var(--border)}
.compare-table thead th{background:var(--bg-gray);color:var(--dark);font-weight:700}
.compare-table tbody tr:last-child td{border-bottom:none}
.compare-table th:first-child,.compare-table td:first-child{width:26%;text-align:left;color:var(--text-sub);font-weight:600}
.compare-table .col-us{background:var(--primary-light);color:var(--dark);font-weight:700}
.compare-table .ok{color:#16A34A;font-weight:800}
.compare-table .no{color:#B0B6C4;font-weight:800}

.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.stat-card{padding:38px 20px;text-align:center}
.stat-num,.download h1 span{background:var(--gradient);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat-num{font-size:42px;font-weight:800;line-height:1.2}
.stat-label{font-size:15px;color:var(--text-sub);margin-top:10px}

.reviews-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.review-card{padding:26px}
.review-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.avatar{width:46px;height:46px;border-radius:50%;background:var(--gradient);color:#fff;font-size:19px;font-weight:700;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.review-name{font-weight:700;color:var(--dark);font-size:15px}
.stars{color:#FFB800;font-size:13px;letter-spacing:2px;margin-top:2px}
.review-text{font-size:14.5px;color:var(--text);line-height:1.8}

.update-card{max-width:760px;margin:0 auto;background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:38px;box-shadow:var(--shadow)}
.update-head{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:22px}
.version-badge{background:var(--gradient);color:#fff;font-size:18px;font-weight:800;padding:7px 20px;border-radius:999px}
.update-date{font-size:14px;color:var(--text-sub)}
.update-list li{position:relative;padding-left:24px;font-size:15px;color:var(--text);margin-bottom:12px}
.update-list li::before{content:"";position:absolute;left:2px;top:9px;width:8px;height:8px;border-radius:50%;background:var(--primary)}
.update-list li:last-child{margin-bottom:0}

.faq-list{max-width:800px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--border);border-radius:var(--radius);margin-bottom:14px;overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .25s}
.faq-item:hover{box-shadow:var(--shadow-hover)}
.faq-item summary{list-style:none;cursor:pointer;padding:18px 22px;font-size:16px;font-weight:700;color:var(--dark);display:flex;justify-content:space-between;align-items:center;gap:14px;user-select:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:24px;font-weight:400;color:var(--primary);line-height:1;transition:transform .3s}
.faq-item[open] summary{border-bottom:1px solid var(--border)}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-body{padding:16px 22px 20px;font-size:15px;color:var(--text-sub)}

.download{padding:90px 0;background:linear-gradient(180deg,#12141B 0%,#1B1F2A 100%);text-align:center;position:relative;overflow:hidden}
.download::before{content:"";position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(255,107,53,.3),transparent 70%);top:-220px;left:-140px}
.download::after{content:"";position:absolute;width:440px;height:440px;border-radius:50%;background:radial-gradient(circle,rgba(255,154,92,.22),transparent 70%);bottom:-180px;right:-120px}
.download-inner{position:relative;z-index:1}
.download h1{color:#fff;font-size:38px;margin-bottom:14px}
.download-meta{color:rgba(255,255,255,.7);font-size:14px;margin-bottom:34px}
.download-btns{display:flex;gap:20px;justify-content:center;flex-wrap:wrap}
.download-tip{color:rgba(255,255,255,.85);margin-top:30px;font-size:15px}

.footer{background:#0F1116;color:rgba(255,255,255,.5);text-align:center;padding:26px 20px;font-size:14px}
.footer a{color:rgba(255,255,255,.9);text-decoration:none;transition:color .2s}
.footer a:hover{color:#fff}

.to-top{position:fixed;right:24px;bottom:30px;z-index:90;width:46px;height:46px;border-radius:50%;background:var(--gradient);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px rgba(255,107,53,.35);opacity:0;visibility:hidden;transform:translateY(14px);transition:opacity .3s,transform .3s,visibility .3s}
.to-top.show{opacity:1;visibility:visible;transform:none}
.to-top svg{width:20px;height:20px;stroke-width:2.5}

.reveal{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

@media (max-width:992px){
  .nav-menu{display:none}
  .hero{padding:112px 0 64px}
  .hero h1{font-size:38px}
  .hero-inner{gap:40px}
  .section{padding:64px 0}
  .section-title{font-size:30px}
  .works-grid{grid-template-columns:repeat(2,1fr)}
  .features-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr)}
  .reviews-grid{grid-template-columns:repeat(2,1fr)}
}

@media (max-width:768px){
  .container{padding:0 20px}
  .nav-inner{height:58px}
  .logo{font-size:20px}
  .nav-btn{padding:6px 13px;font-size:12.5px}
  .hero{padding:96px 0 56px}
  .hero-inner{flex-direction:column;gap:34px;text-align:center}
  .hero h1{font-size:30px}
  .hero-desc{font-size:15px;margin:20px auto 0}
  .hero-btns,.download-btns{flex-direction:column;gap:14px}
  .hero-btns .btn,.download-btns .btn{width:100%}
  .hero-tags{justify-content:center}
  .section{padding:56px 0}
  .section-title{font-size:26px}
  .section-sub{font-size:14px;margin-bottom:34px}
  .works-grid,.features-grid,.stats-grid,.reviews-grid{grid-template-columns:1fr;gap:18px}
  .feature-card{padding:24px 20px}
  .intro-card{padding:26px 20px}
  .compare-table th,.compare-table td{padding:12px 8px;font-size:12.5px}
  .compare-table th:first-child,.compare-table td:first-child{width:24%}
  .update-card{padding:26px 20px}
  .update-list li{font-size:14px}
  .faq-item summary{font-size:15px;padding:16px 16px}
  .faq-body{padding:14px 16px 18px;font-size:14px}
  .download{padding:64px 0}
  .download h1{font-size:28px}
  .download-meta{font-size:12px;white-space:nowrap}
  .download-btns{width:100%}
  .download-tip{font-size:14px}
  .to-top{right:16px;bottom:24px;width:42px;height:42px}
}