/* ============================================
   快连 v2 - 全新设计系统
   ============================================ */
:root {
  --primary: #0d9488;
  --primary-dark: #0f766e;
  --primary-light: #2dd4bf;
  --primary-lighter: #ccfbf1;
  --accent: #6366f1;
  --accent-dark: #4f46e5;
  --accent-light: #a5b4fc;
  --accent-lighter: #e0e7ff;
  --warm: #f59e0b;
  --warm-light: #fde68a;
  --bg: #fafbfc;
  --bg-card: #ffffff;
  --text: #0f172a;
  --text-mid: #475569;
  --text-light: #94a3b8;
  --border: #e9edf2;
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.04);
  --shadow: 0 4px 20px rgba(0,0,0,.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.08);
  --shadow-xl: 0 24px 60px rgba(0,0,0,.1);
  --transition: .35s cubic-bezier(.22,1,.36,1);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;font-size:16px;scroll-padding-top:80px}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
  color:var(--text);
  line-height:1.6;
  background:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--primary);text-decoration:none;transition:var(--transition)}
a:hover{color:var(--primary-dark)}
.container{max-width:1140px;margin:0 auto;padding:0 24px}

/* ---- 渐变文字 ---- */
.gradient-text{
  background:linear-gradient(135deg,var(--primary),var(--accent));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}

/* ---- 按钮 ---- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:12px 28px;border-radius:50px;
  font-size:.9375rem;font-weight:600;
  border:none;cursor:pointer;
  transition:var(--transition);text-decoration:none;
  line-height:1.4;
}
.btn-primary{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;box-shadow:0 4px 16px rgba(13,148,136,.3);
}
.btn-primary:hover{
  transform:translateY(-2px);box-shadow:0 8px 28px rgba(13,148,136,.4);color:#fff;
}
.btn-accent{
  background:linear-gradient(135deg,var(--accent),var(--accent-dark));
  color:#fff;box-shadow:0 4px 16px rgba(99,102,241,.3);
}
.btn-accent:hover{transform:translateY(-2px);box-shadow:0 8px 28px rgba(99,102,241,.4);color:#fff;}
.btn-ghost{
  background:transparent;color:var(--primary);
  border:2px solid var(--primary);
}
.btn-ghost:hover{background:var(--primary);color:#fff;transform:translateY(-2px);}
.btn-lg{padding:16px 36px;font-size:1.0625rem;}
.btn-block{width:100%;justify-content:center;}

/* ---- 背景网格 ---- */
.bg-grid{
  background-image:
    linear-gradient(rgba(13,148,136,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(13,148,136,.04) 1px,transparent 1px);
  background-size:60px 60px;
}

/* ---- Header ---- */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(255,255,255,.85);backdrop-filter:blur(16px) saturate(1.8);
  border-bottom:1px solid var(--border);
}
.header .container{
  display:flex;align-items:center;justify-content:space-between;height:68px;
}
.logo{
  display:flex;align-items:center;gap:10px;
  font-size:1.25rem;font-weight:800;color:var(--text);
}
.logo-mark{
  width:34px;height:34px;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  border-radius:10px;display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:1rem;font-weight:700;
  box-shadow:0 2px 8px rgba(13,148,136,.25);
}
.nav{display:flex;align-items:center;gap:6px;}
.nav a{
  padding:8px 18px;border-radius:8px;
  color:var(--text-mid);font-weight:500;font-size:.875rem;
  transition:var(--transition);
}
.nav a:hover,.nav a.active{background:var(--primary-lighter);color:var(--primary-dark);}
.nav .btn-nav{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff !important;padding:8px 22px;border-radius:50px;
  margin-left:8px;font-weight:600;
}
.nav .btn-nav:hover{box-shadow:0 4px 16px rgba(13,148,136,.35);transform:translateY(-1px);}
.mobile-toggle{
  display:none;flex-direction:column;gap:5px;cursor:pointer;
  background:none;border:none;padding:4px;
}
.mobile-toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:var(--transition);}

/* ---- Hero ---- */
.hero{
  padding:100px 0 80px;
  background:linear-gradient(160deg,#f0fdfa 0%,#eef2ff 40%,#faf5ff 70%,#fefce8 100%);
  text-align:center;position:relative;overflow:hidden;
}
.hero-bg-glow{
  position:absolute;top:-30%;left:-10%;width:120%;height:140%;
  background:
    radial-gradient(ellipse at 20% 50%,rgba(13,148,136,.1) 0%,transparent 60%),
    radial-gradient(ellipse at 80% 40%,rgba(99,102,241,.08) 0%,transparent 60%),
    radial-gradient(ellipse at 50% 80%,rgba(245,158,11,.06) 0%,transparent 50%);
  pointer-events:none;
}
.hero .container{position:relative;z-index:1;}
.hero-badge{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 16px;border-radius:50px;
  background:rgba(13,148,136,.08);border:1px solid rgba(13,148,136,.15);
  font-size:.8125rem;color:var(--primary-dark);font-weight:500;
  margin-bottom:20px;
}
.hero h1{
  font-size:3.5rem;font-weight:800;line-height:1.1;
  margin-bottom:16px;letter-spacing:-.025em;
}
.hero .lead{
  font-size:1.1875rem;color:var(--text-mid);
  max-width:600px;margin:0 auto 32px;line-height:1.8;
}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;}

/* ---- Hero Stats ---- */
.hero-stats{
  display:flex;justify-content:center;gap:56px;
  margin-top:56px;padding-top:36px;
  border-top:1px solid rgba(13,148,136,.1);
}
.hero-stat{text-align:center;}
.hero-stat .num{
  font-size:2.25rem;font-weight:800;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
  line-height:1.2;
}
.hero-stat .label{font-size:.8125rem;color:var(--text-light);margin-top:2px;}

/* ---- Section ---- */
.section{padding:80px 0;}
.section-white{background:#fff;}
.section-alt{background:linear-gradient(180deg,var(--bg),#fff);}
.section-dark{
  background:linear-gradient(135deg,#0f172a,#1a1a2e);
  color:#fff;
}
.section-label{
  display:inline-block;
  font-size:.75rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;
  color:var(--primary);margin-bottom:8px;
}
.section-title{
  font-size:2.5rem;font-weight:800;text-align:center;
  margin-bottom:12px;letter-spacing:-.02em;
}
.section-sub{
  font-size:1.125rem;color:var(--text-mid);text-align:center;
  max-width:540px;margin:0 auto 48px;line-height:1.7;
}
.section-dark .section-sub{color:var(--text-light);}

/* ---- Bento Grid （非对称卡片布局） ---- */
.bento{display:grid;grid-template-columns:1fr 1fr 1fr;gap:20px;}
.bento-card{
  background:#fff;border-radius:var(--radius-lg);
  padding:36px 28px;
  border:1px solid var(--border);
  transition:var(--transition);
}
.bento-card:hover{
  border-color:var(--primary-light);
  box-shadow:var(--shadow-lg);
  transform:translateY(-4px);
}
.bento-card.wide{grid-column:span 2;}
.bento-card.tall{grid-row:span 2;display:flex;flex-direction:column;justify-content:center;}
.bento-icon{
  width:48px;height:48px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  font-size:1.375rem;margin-bottom:16px;
}
.bento-icon.teal{background:var(--primary-lighter);}
.bento-icon.indigo{background:var(--accent-lighter);}
.bento-icon.amber{background:#fef3c7;}
.bento-icon.rose{background:#ffe4e6;}
.bento-icon.sky{background:#e0f2fe;}
.bento-icon.lime{background:#ecfccb;}
.bento-card h3{font-size:1.125rem;margin-bottom:8px;font-weight:700;}
.bento-card p{color:var(--text-mid);font-size:.875rem;line-height:1.7;}
.bento-card ul{margin-top:12px;}
.bento-card li{
  padding:4px 0 4px 22px;position:relative;
  color:var(--text-mid);font-size:.8125rem;
}
.bento-card li::before{content:'\2713';position:absolute;left:0;color:var(--primary);font-weight:700;}

/* ---- Timeline （全左对齐） ---- */
.timeline{
  position:relative;max-width:720px;margin:0 auto;padding:12px 0 12px 20px;
}
.timeline::before{
  content:'';
  position:absolute;left:20px;top:0;bottom:0;width:2px;
  background:linear-gradient(180deg,var(--primary-light),var(--accent-light));
}
.tl-item{
  display:grid;grid-template-columns:auto 1fr;gap:24px;
  align-items:start;margin-bottom:36px;position:relative;
  padding-left:20px;
}
.tl-item:last-child{margin-bottom:0;}
.tl-content{
  background:#fff;padding:24px 24px;border-radius:var(--radius);
  border:1px solid var(--border);text-align:left;
}
.tl-content h3{font-size:1.0625rem;margin-bottom:6px;}
.tl-content p{color:var(--text-mid);font-size:.875rem;line-height:1.7;}
.tl-dot{
  width:40px;height:40px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-weight:700;font-size:.875rem;
  box-shadow:0 0 0 6px rgba(13,148,136,.1);
  position:relative;z-index:1;
}

/* ---- Pricing 卡片 ---- */
.pricing-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:960px;margin:0 auto;}
.pricing-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:36px 28px;text-align:center;transition:var(--transition);
  position:relative;
}
.pricing-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow-lg);transform:translateY(-4px);}
.pricing-card.featured{
  border-color:var(--primary);box-shadow:0 0 0 2px var(--primary),var(--shadow-lg);
  transform:scale(1.04);z-index:2;
}
.pricing-card.featured:hover{transform:scale(1.04) translateY(-4px);}
.pricing-badge{
  position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  background:linear-gradient(135deg,var(--primary),var(--primary-dark));
  color:#fff;font-size:.75rem;font-weight:700;padding:4px 16px;border-radius:50px;
}
.pricing-card h3{font-size:1.125rem;margin-bottom:4px;}
.pricing-card .desc{font-size:.8125rem;color:var(--text-light);margin-bottom:20px;}
.pricing-card .price{font-size:2.75rem;font-weight:800;color:var(--text);}
.pricing-card .price span{font-size:1rem;font-weight:400;color:var(--text-light);}
.pricing-card .per{font-size:.8125rem;color:var(--text-light);margin-bottom:24px;}
.pricing-card ul{text-align:left;margin:24px 0;}
.pricing-card li{padding:6px 0 6px 24px;position:relative;color:var(--text-mid);font-size:.875rem;}
.pricing-card li::before{content:'\2713';position:absolute;left:0;color:var(--primary);font-weight:700;}

/* ---- Download Tabs ---- */
.tabs{max-width:720px;margin:0 auto;}
.tab-nav{
  display:flex;justify-content:center;gap:4px;
  background:var(--bg);padding:4px;border-radius:50px;
  border:1px solid var(--border);margin-bottom:32px;
}
.tab-btn{
  padding:10px 28px;border-radius:50px;border:none;
  background:transparent;font-size:.875rem;font-weight:600;
  color:var(--text-mid);cursor:pointer;transition:var(--transition);
}
.tab-btn.active{background:#fff;color:var(--primary-dark);box-shadow:var(--shadow-sm);}
.tab-pane{display:none;}
.tab-pane.active{display:block;}
.dl-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:40px;text-align:center;
}
.dl-icon{font-size:4rem;line-height:1;margin-bottom:16px;}
.dl-card h3{font-size:1.375rem;margin-bottom:4px;}
.dl-card .version{color:var(--text-light);font-size:.8125rem;margin-bottom:24px;}
.dl-card .btn{min-width:240px;}
.dl-card .meta{margin-top:16px;font-size:.75rem;color:var(--text-light);}

/* ---- Guide Steps ---- */
.guide-step{
  display:grid;grid-template-columns:auto 1fr;gap:28px;
  margin-bottom:28px;align-items:start;
}
.guide-step:last-child{margin-bottom:0;}
.guide-num{
  width:56px;height:56px;border-radius:var(--radius);
  background:linear-gradient(135deg,var(--primary),var(--accent));
  display:flex;align-items:center;justify-content:center;
  color:#fff;font-size:1.25rem;font-weight:800;flex-shrink:0;
}
.guide-body{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:24px 28px;
}
.guide-body h3{font-size:1.0625rem;margin-bottom:6px;}
.guide-body p{color:var(--text-mid);font-size:.875rem;line-height:1.7;}
.guide-body .tip{
  margin-top:12px;padding:12px 16px;background:var(--primary-lighter);
  border-radius:var(--radius-sm);font-size:.8125rem;color:var(--primary-dark);
}

/* ---- FAQ ---- */
.faq-category{margin-bottom:48px;}
.faq-category:last-child{margin-bottom:0;}
.faq-category h3{
  font-size:1.25rem;margin-bottom:16px;
  display:flex;align-items:center;gap:8px;
}
.faq-category h3 .badge{
  font-size:.6875rem;font-weight:600;padding:2px 10px;
  border-radius:50px;background:var(--primary-lighter);color:var(--primary-dark);
}
.faq-item{
  border:1px solid var(--border);border-radius:var(--radius);
  margin-bottom:10px;overflow:hidden;transition:var(--transition);
  background:#fff;
}
.faq-item:hover{border-color:var(--primary-light);}
.faq-q{
  width:100%;padding:18px 22px;display:flex;justify-content:space-between;align-items:center;
  background:none;border:none;font-size:.9375rem;font-weight:600;
  color:var(--text);cursor:pointer;text-align:left;line-height:1.5;
  gap:16px;
}
.faq-q::after{
  content:'+';font-size:1.25rem;color:var(--primary);
  transition:var(--transition);flex-shrink:0;
  width:24px;height:24px;display:flex;align-items:center;justify-content:center;
  border-radius:50%;background:var(--primary-lighter);
}
.faq-item.open .faq-q::after{content:'\2212';background:var(--primary);color:#fff;}
.faq-a{
  max-height:0;overflow:hidden;transition:var(--transition);
  padding:0 22px;color:var(--text-mid);font-size:.875rem;line-height:1.8;
}
.faq-item.open .faq-a{max-height:500px;padding:0 22px 18px;}
.faq-a p{margin-bottom:8px;}
.faq-a p:last-child{margin-bottom:0;}
.faq-a a{color:var(--primary);text-decoration:underline;}

/* ---- Testimonials ---- */
.testimonial-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
.testimonial-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius-lg);
  padding:28px 24px;position:relative;
}
.testimonial-card::before{content:'"';font-size:4rem;line-height:1;color:var(--primary-lighter);position:absolute;top:12px;right:20px;font-family:Georgia,serif;}
.testimonial-card p{color:var(--text-mid);font-size:.875rem;line-height:1.8;margin-bottom:16px;position:relative;z-index:1;}
.testimonial-author{display:flex;align-items:center;gap:12px;}
.testimonial-avatar{
  width:40px;height:40px;border-radius:50%;
  background:linear-gradient(135deg,var(--primary-light),var(--accent-light));
  display:flex;align-items:center;justify-content:center;color:#fff;font-weight:700;font-size:.875rem;
}
.testimonial-name{font-size:.8125rem;font-weight:600;}
.testimonial-role{font-size:.75rem;color:var(--text-light);}

/* ---- Page Header ---- */
.page-hd{
  padding:56px 0;text-align:center;
  background:linear-gradient(160deg,#f0fdfa,#eef2ff,#faf5ff);
  position:relative;overflow:hidden;
}
.page-hd .bg{
  position:absolute;inset:0;
  background:radial-gradient(ellipse at 30% 50%,rgba(13,148,136,.06) 0%,transparent 60%),
             radial-gradient(ellipse at 70% 50%,rgba(99,102,241,.05) 0%,transparent 60%);
  pointer-events:none;
}
.page-hd .container{position:relative;z-index:1;}
.page-hd h1{font-size:2.75rem;font-weight:800;margin-bottom:10px;letter-spacing:-.02em;}
.page-hd p{color:var(--text-mid);font-size:1.0625rem;max-width:560px;margin:0 auto;line-height:1.7;}

/* ---- Breadcrumb ---- */
.breadcrumb{
  padding:14px 0;font-size:.8125rem;
  background:#fff;border-bottom:1px solid var(--border);
}
.breadcrumb .container{display:flex;align-items:center;gap:8px;}
.breadcrumb a{color:var(--text-light);}
.breadcrumb a:hover{color:var(--primary);}
.breadcrumb .current{color:var(--text-mid);}
.breadcrumb .sep{color:var(--text-light);}

/* ---- CTA Banner ---- */
.cta-banner{
  background:linear-gradient(135deg,var(--primary),var(--primary-dark),var(--accent-dark));
  border-radius:var(--radius-xl);padding:60px 48px;
  text-align:center;color:#fff;position:relative;overflow:hidden;
}
.cta-banner::before{
  content:'';position:absolute;inset:0;
  background:radial-gradient(ellipse at 30% 0,rgba(255,255,255,.1) 0%,transparent 60%);
}
.cta-banner .container{position:relative;z-index:1;}
.cta-banner h2{font-size:2rem;font-weight:800;margin-bottom:10px;}
.cta-banner p{opacity:.85;margin-bottom:28px;font-size:1.0625rem;}
.cta-banner .btn{background:#fff;color:var(--primary-dark);}
.cta-banner .btn:hover{transform:translateY(-2px);box-shadow:0 8px 30px rgba(0,0,0,.2);color:var(--primary);}

/* ---- Footer ---- */
.footer{
  background:#0f172a;color:var(--text-light);
  padding:56px 0 24px;margin-top:80px;
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:36px;}
.footer-brand .logo{color:#fff;margin-bottom:12px;}
.footer-brand p{font-size:.8125rem;line-height:1.8;max-width:300px;}
.footer h4{color:#fff;font-size:.875rem;margin-bottom:14px;}
.footer a{color:var(--text-light);font-size:.8125rem;display:block;margin-bottom:8px;}
.footer a:hover{color:var(--primary-light);}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.06);
  padding-top:20px;display:flex;justify-content:space-between;
  font-size:.75rem;
}

/* ---- 系统要求表格 ---- */
.spec-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;}
.spec-card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;text-align:center;
}
.spec-card .icon{font-size:2rem;margin-bottom:8px;}
.spec-card h4{font-size:.875rem;margin-bottom:4px;}
.spec-card p{font-size:.75rem;color:var(--text-light);line-height:1.6;}

/* ---- 版本历史 ---- */
.changelog{max-width:720px;margin:32px auto 0;}
.cl-item{
  display:grid;grid-template-columns:100px 1fr;gap:16px;
  padding:14px 0;border-bottom:1px solid var(--border);
}
.cl-item:last-child{border-bottom:none;}
.cl-version{font-weight:700;font-size:.875rem;color:var(--primary);}
.cl-info{font-size:.8125rem;color:var(--text-mid);}

/* ---- Responsive ---- */
@media(max-width:1024px){
  .hero h1{font-size:2.75rem;}
  .bento{grid-template-columns:1fr 1fr;}
  .pricing-grid{grid-template-columns:1fr 1fr;}
  .pricing-card.featured{transform:none;}
  .pricing-card.featured:hover{transform:translateY(-4px);}
  .testimonial-grid{grid-template-columns:1fr 1fr;}
}

@media(max-width:768px){
  .nav{display:none;}
  .mobile-toggle{display:flex;}
  .nav.open{
    display:flex;flex-direction:column;position:absolute;top:68px;left:0;right:0;
    background:rgba(255,255,255,.98);backdrop-filter:blur(12px);
    padding:16px;border-bottom:1px solid var(--border);gap:4px;
  }
  .nav.open a{border-radius:8px;padding:12px 16px;}
  .nav.open .btn-nav{margin-left:0;text-align:center;}

  .hero{padding:60px 0 48px;}
  .hero h1{font-size:2.125rem;}
  .hero .lead{font-size:1rem;}
  .hero-stats{gap:24px;flex-wrap:wrap;}
  .hero-stat .num{font-size:1.625rem;}

  .section{padding:48px 0;}
  .section-title{font-size:1.625rem;}
  .bento{grid-template-columns:1fr;}
  .bento-card.wide{grid-column:span 1;}

  .timeline::before{left:17px;}
  .tl-item{gap:16px;padding-left:12px;}
  .tl-dot{width:34px;height:34px;font-size:.75rem;box-shadow:0 0 0 4px rgba(13,148,136,.1);}

  .pricing-grid{grid-template-columns:1fr;max-width:400px;margin:0 auto;}
  .testimonial-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .page-hd h1{font-size:1.75rem;}
  .spec-grid{grid-template-columns:1fr 1fr;}
  .guide-step{grid-template-columns:1fr;}
  .guide-num{width:44px;height:44px;font-size:1rem;}
  .cta-banner{padding:40px 24px;}
  .cta-banner h2{font-size:1.375rem;}
  .cl-item{grid-template-columns:1fr;gap:4px;}
  .tab-btn{padding:8px 16px;font-size:.8125rem;}
  .dl-card{padding:28px 20px;}
}

@media(max-width:480px){
  .hero h1{font-size:1.625rem;}
  .hero-actions{flex-direction:column;align-items:center;}
  .btn-lg{width:100%;justify-content:center;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-bottom{flex-direction:column;gap:6px;text-align:center;}
  .spec-grid{grid-template-columns:1fr 1fr;}
  .tab-nav{flex-wrap:nowrap;overflow-x:auto;border-radius:var(--radius);gap:0;}
  .tab-btn{white-space:nowrap;padding:8px 14px;font-size:.75rem;}
}