/* 云开网络 · 万词霸屏站点样式（沿用官网视觉体系） */
:root{
  --brand:#2563eb;--brand-dark:#1d4ed8;--brand-light:#eff6ff;--cyan:#0ea5e9;
  --text:#1e293b;--text-2:#475569;--text-3:#94a3b8;
  --bg:#ffffff;--bg-soft:#f8fafc;--line:#e2e8f0;
  --radius:14px;
  --shadow:0 1px 3px rgba(15,23,42,.06),0 8px 24px rgba(15,23,42,.05);
  --shadow-lg:0 4px 12px rgba(37,99,235,.10),0 18px 40px rgba(15,23,42,.08);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
  color:var(--text);background:var(--bg);line-height:1.8;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{text-decoration:none;color:inherit}
.container{width:100%;max-width:1160px;margin:0 auto;padding:0 20px}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px}
.logo-mark{width:34px;height:34px;flex:none;display:flex;align-items:center;justify-content:center}
.logo-mark svg{width:34px;height:34px;display:block}
.logo-text{display:flex;flex-direction:column;line-height:1.2}
.logo-text em{font-style:normal;font-size:10.5px;color:var(--text-3);font-weight:500;letter-spacing:2px}
.nav-menu{display:flex;gap:26px;font-size:15px;color:var(--text-2)}
.nav-menu a{transition:color .2s}
.nav-menu a:hover{color:var(--brand)}
.nav-cta{background:var(--brand);color:#fff;padding:9px 20px;border-radius:8px;
  font-size:14px;font-weight:600;transition:background .2s}
.nav-cta:hover{background:var(--brand-dark)}

/* 面包屑 */
.crumb{background:var(--bg-soft);border-bottom:1px solid var(--line);
  font-size:13.5px;color:var(--text-3);padding:12px 0}
.crumb a{color:var(--text-2)}
.crumb a:hover{color:var(--brand)}
.crumb .sep{margin:0 8px;color:#cbd5e1}
.crumb .cur{color:var(--text)}

/* 页头 */
.page-head{background:linear-gradient(180deg,#f8fafc 0%,#ffffff 100%);
  padding:44px 0 30px;border-bottom:1px solid var(--line)}
.page-head h1{font-size:32px;font-weight:800;letter-spacing:-.3px;
  line-height:1.35;margin-bottom:12px}
.page-head .sub{font-size:16px;color:var(--text-2);max-width:820px}

/* 正文区 */
.section{padding:52px 0}
.section-soft{background:var(--bg-soft)}
.sec-h2{font-size:23px;font-weight:800;margin:34px 0 14px;
  padding-left:12px;border-left:4px solid var(--brand);line-height:1.4}
.sec-h2:first-child{margin-top:0}
.section p{margin-bottom:14px;font-size:15.5px;color:var(--text-2)}
.section b{color:var(--text)}
.hl{color:var(--brand);font-size:17px}
.note{font-size:14px;color:var(--text-3);
  background:var(--bg-soft);border-left:3px solid #cbd5e1;padding:10px 14px;border-radius:0 8px 8px 0}

/* 列表 */
ol.num,ul.tick,ul.warn{margin:0 0 16px;padding-left:22px}
ol.num li,ul.tick li,ul.warn li{margin-bottom:9px;font-size:15px;color:var(--text-2)}
ol.num li::marker{color:var(--brand);font-weight:700}
ul.tick li{list-style:none;position:relative;padding-left:24px}
ul.tick li::before{content:"✓";position:absolute;left:0;color:#22c55e;font-weight:700}
ul.warn li{list-style:none;position:relative;padding-left:24px}
ul.warn li::before{content:"!";position:absolute;left:6px;color:#f59e0b;font-weight:800}

/* 表格 */
.table-wrap{overflow-x:auto;margin:16px 0 18px;border:1px solid var(--line);border-radius:12px}
.ptable{width:100%;border-collapse:collapse;font-size:14.5px;min-width:560px;background:#fff}
.ptable th{background:var(--brand-light);color:var(--brand-dark);font-weight:700;
  text-align:left;padding:12px 14px;border-bottom:1px solid var(--line);white-space:nowrap}
.ptable td{padding:12px 14px;border-bottom:1px solid #f1f5f9;color:var(--text-2);vertical-align:top}
.ptable tr:last-child td{border-bottom:none}
.ptable td.p{color:var(--brand);font-weight:700;white-space:nowrap}
.ptable tr.rec{background:#fffbeb}
.tag-rec{display:inline-block;margin-left:6px;font-size:11px;font-weight:700;
  color:#b45309;background:#fde68a;padding:2px 7px;border-radius:5px;vertical-align:middle}

/* 卡片 */
.cards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin:18px 0}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:22px 20px;transition:all .2s}
.card:hover{border-color:#bfdbfe;box-shadow:var(--shadow);transform:translateY(-3px)}
.card h3{font-size:17px;font-weight:700;margin-bottom:8px}
.card p{font-size:14px;color:var(--text-2);margin-bottom:14px;min-height:66px}
.card-meta{display:flex;justify-content:space-between;align-items:baseline;
  padding-top:12px;border-top:1px dashed var(--line)}
.card-meta .price{font-size:15px;font-weight:800;color:var(--brand)}
.card-meta .cycle{font-size:12.5px;color:var(--text-3)}

/* 相关词内链 */
.related{background:var(--bg-soft);border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);padding:34px 0}
.rel-t{font-size:16px;font-weight:700;margin-bottom:14px;color:var(--text-2)}
.chips{display:flex;flex-wrap:wrap;gap:9px}
.chip{font-size:13.5px;color:var(--text-2);background:#fff;border:1px solid var(--line);
  padding:6px 13px;border-radius:8px;transition:all .18s}
.chip:hover{border-color:var(--brand);color:var(--brand);background:var(--brand-light)}

/* FAQ */
.faq-sec{padding-top:8px}
.faq{max-width:900px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;
  margin-bottom:11px;transition:border-color .2s}
.faq details[open]{border-color:#bfdbfe;box-shadow:var(--shadow)}
.faq summary{padding:16px 20px;cursor:pointer;font-size:16px;font-weight:600;
  list-style:none;display:flex;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:21px;color:var(--brand);line-height:1}
.faq details[open] summary::after{content:"−"}
.faq .faq-a{padding:0 20px 18px;font-size:14.5px;color:var(--text-2)}

/* CTA */
.cta{background:linear-gradient(135deg,#1e40af 0%,var(--brand) 46%,var(--cyan) 100%);
  color:#fff;padding:64px 0}
.cta-grid{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center}
.cta h2{font-size:29px;font-weight:800;margin-bottom:12px;letter-spacing:-.3px}
.cta p{font-size:15.5px;opacity:.92;margin-bottom:22px;max-width:520px}
.cta-btns{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:13px 26px;border-radius:10px;
  font-size:15px;font-weight:600;transition:all .2s;border:1px solid transparent}
.btn-white{background:#fff;color:var(--brand-dark);font-weight:700}
.btn-white:hover{transform:translateY(-2px);box-shadow:0 10px 22px rgba(0,0,0,.16)}
.btn-outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.55)}
.btn-outline:hover{background:rgba(255,255,255,.12)}
.contact-card{background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.28);
  border-radius:16px;padding:20px;text-align:center;min-width:232px}
.qr-img{width:150px;height:150px;margin:0 auto 12px;border-radius:12px;
  background:#fff;padding:6px;box-shadow:0 6px 18px rgba(0,0,0,.14)}
.contact-card b{display:block;font-size:15px;margin-bottom:4px}
.contact-card span{font-size:13px;opacity:.9}

/* 页脚 */
.footer{background:#0f172a;color:#cbd5e1;padding:42px 0 26px;font-size:14px}
.footer-grid{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;margin-bottom:26px}
.footer h5{color:#fff;font-size:15px;margin-bottom:12px;font-weight:700}
.footer ul{list-style:none}
.footer li{margin-bottom:7px;opacity:.85}
.footer a:hover{color:#fff}
.footer p{max-width:340px;opacity:.85}
.footer-copy{text-align:center;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);
  font-size:13px;opacity:.65}

/* 响应式 */
@media (max-width:1000px){
  .cards{grid-template-columns:repeat(2,1fr)}
  .card p{min-height:auto}
  .cta-grid{grid-template-columns:1fr;text-align:center}
  .cta-btns{justify-content:center}
}
@media (max-width:720px){
  .nav-menu{display:none}
  .page-head{padding:32px 0 22px}
  .page-head h1{font-size:24px}
  .sec-h2{font-size:20px}
  .section{padding:38px 0}
  .cards{grid-template-columns:1fr}
  .footer-grid{flex-direction:column;gap:22px}
}