*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  color:#1a1a1a;
  background:#fff;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  font-size:16px;
}
.serif{font-family:Georgia,"Noto Serif SC","Songti SC",serif}
img{display:block;max-width:100%;height:auto}
a{color:#1565c0;text-decoration:none}
a:hover{text-decoration:underline}

.wrap{width:min(960px,calc(100% - 32px));margin:0 auto}

.site-top{padding:18px 0;border-bottom:1px solid #ececec;background:#fff;position:sticky;top:0;z-index:50}
.top-row{display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:700;font-size:15px;text-decoration:none}
.brand:hover{text-decoration:none;color:#333}
.brand img{width:38px;border-radius:9px}
.menu-btn{display:none;border:1px solid #d0d0d0;background:#fff;padding:7px 12px;border-radius:8px;font-size:14px;cursor:pointer}
.top-nav{display:flex;gap:20px;flex-wrap:wrap}
.top-nav a{color:#555;font-size:13px;font-weight:600;text-decoration:none}
.top-nav a:hover{color:#111;text-decoration:none}
.mnav{display:none;flex-direction:column;padding:12px 0 4px;border-top:1px solid #f0f0f0;margin-top:12px}
.mnav.open{display:flex}
.mnav a{padding:10px 0;border-bottom:1px solid #f5f5f5;color:#444;font-size:14px;text-decoration:none}

.hero{padding:36px 0 24px;text-align:center}
.hero h1{font-size:clamp(26px,4.5vw,38px);line-height:1.28;margin:0 0 14px;color:#111;font-weight:800}
.hero-lead{max-width:720px;margin:0 auto;font-size:17px;color:#555;line-height:1.7}
.hero-meta{margin-top:12px;font-size:13px;color:#999}

.pricing-section{padding:8px 0 44px}
.pricing-head{text-align:center;margin-bottom:28px}
.pricing-head h2{font-size:22px;margin:0 0 8px;color:#111}
.pricing-head p{margin:0;color:#666;font-size:15px}

.pricing-cards{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:32px;max-width:640px;margin-left:auto;margin-right:auto}
.price-card{
  border:2px solid #e8e8e8;
  border-radius:14px;
  padding:28px 24px;
  text-align:center;
  background:#fff;
  position:relative;
}
.price-card.featured{border-color:#2e7d32;background:#f9fdf9}
.price-card .plan-name{font-size:13px;font-weight:700;color:#666;letter-spacing:.08em;text-transform:uppercase;margin:0 0 8px}
.price-card .plan-price{font-size:36px;font-weight:800;color:#111;margin:0 0 4px;line-height:1.1}
.price-card .plan-price span{font-size:16px;font-weight:600;color:#2e7d32}
.price-card .plan-note{font-size:13px;color:#888;margin:0 0 16px}
.price-card .badge{
  position:absolute;top:-11px;left:50%;transform:translateX(-50%);
  background:#2e7d32;color:#fff;font-size:11px;font-weight:700;
  padding:4px 12px;border-radius:20px;letter-spacing:.04em;
}

.table-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch;margin:0 -4px;padding:4px}
.pricing-table{
  width:100%;min-width:560px;
  border-collapse:separate;border-spacing:0;
  border:1px solid #e0e0e0;border-radius:12px;
  overflow:hidden;background:#fff;
  box-shadow:0 4px 24px rgba(0,0,0,.04);
}
.pricing-table th,.pricing-table td{
  padding:14px 16px;text-align:center;vertical-align:middle;
  border-bottom:1px solid #ececec;font-size:14px;line-height:1.55;
}
.pricing-table thead th{background:#f7f7f7;font-size:13px;font-weight:700;color:#333}
.pricing-table thead th:first-child{text-align:left;width:36%}
.pricing-table tbody tr:last-child td{border-bottom:none}
.pricing-table tbody tr:nth-child(even) td{background:#fafafa}
.pricing-table .feat{text-align:left;font-weight:600;color:#222;background:#f3f3f3!important}
.pricing-table .col-free{background:#f5f9ff}
.pricing-table .col-premium{background:#f1f8f1}
.pricing-table thead .col-free{background:#e3f2fd;color:#1565c0}
.pricing-table thead .col-premium{background:#e8f5e9;color:#2e7d32}
.pricing-table .check{color:#2e7d32;font-weight:700;font-size:16px}
.pricing-table .note{font-size:12px;color:#888;display:block;margin-top:2px;font-weight:400}

.legend{display:flex;flex-wrap:wrap;justify-content:center;gap:16px 24px;margin-top:18px;font-size:13px;color:#666}
.legend span{display:flex;align-items:center;gap:6px}
.legend i{display:inline-block;width:12px;height:12px;border-radius:3px}
.legend .lg-free{background:#e3f2fd;border:1px solid #90caf9}
.legend .lg-premium{background:#e8f5e9;border:1px solid #a5d6a7}

.content{padding:20px 0 56px}
.content h2{font-size:24px;margin:44px 0 16px;color:#111;font-weight:700}
.content h3{font-size:18px;margin:28px 0 12px;color:#222}
.content p{margin:0 0 18px;color:#333;font-size:16px;line-height:1.8}
.content ul,.content ol{margin:0 0 18px;padding-left:22px;color:#333}
.content li{margin-bottom:8px;line-height:1.75}

.tip-box{margin:28px 0;padding:18px 20px;background:#f9f9f9;border-left:4px solid #2e7d32;border-radius:0 8px 8px 0;font-size:15px;color:#444}
.tip-box strong{display:block;margin-bottom:6px;color:#111;font-size:14px}

.fig{margin:32px 0;text-align:center}
.fig img{margin:0 auto;border-radius:8px;border:1px solid #eee}
.fig figcaption{font-size:13px;color:#777;margin-top:10px}

.link-row{display:flex;flex-wrap:wrap;gap:12px;margin:28px 0}
.link-chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border:1px solid #e0e0e0;border-radius:8px;
  font-size:14px;color:#333;background:#fafafa;text-decoration:none;
}
.link-chip:hover{background:#f0f0f0;text-decoration:none;color:#111}

.faq{margin:40px 0 0;padding-top:32px;border-top:1px solid #ececec}
.faq h2{font-size:22px;margin-bottom:16px}
.faq details{border-bottom:1px solid #ececec;padding:14px 0}
.faq summary{cursor:pointer;font-weight:600;font-size:16px;color:#222;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq p{margin:10px 0 0;font-size:15px;color:#555}

.prose{padding:40px 0 56px}
.prose h1{font-size:32px;line-height:1.25;margin:0 0 18px}
.prose h2{font-size:21px;margin:32px 0 12px;color:#222}
.prose p,.prose li{font-size:16px;color:#333;line-height:1.8}
.related{margin-top:36px;padding:20px;border:1px solid #e8e8e8;border-radius:10px;background:#fafafa}
.related h3{margin:0 0 12px;font-size:14px;color:#666;letter-spacing:.04em}
.related a{display:block;padding:4px 0;font-size:15px}

.site-foot{padding:36px 0 44px;border-top:1px solid #ececec;font-size:13px;color:#888}
.site-foot a{color:#666;margin-right:14px;text-decoration:none}
.site-foot a:hover{color:#333;text-decoration:none}
.site-foot p{margin:12px 0 0}

.err{min-height:55vh;display:grid;place-items:center;text-align:center;padding:48px 20px}
.err h1{font-size:52px;margin:0 0 12px;color:#ccc}
.err p{font-size:16px;color:#666}

@media(max-width:720px){
  .menu-btn{display:block}
  .top-nav{display:none}
  .pricing-cards{grid-template-columns:1fr;max-width:320px}
  .pricing-table th,.pricing-table td{padding:11px 10px;font-size:13px}
  .hero{padding:28px 0 20px}
}