:root{
  --ink:#12202f; --brand:#17457e; --brand-dark:#0f2f59; --accent:#b5763a;
  --bg:#ffffff; --soft:#f5f8fc; --line:#e2e8f0; --muted:#5a6b80;
  --ok:#166534; --warn:#92400e; --radius:14px;
  --max:1120px; --font:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",Segoe UI,sans-serif;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16.5px;line-height:1.85;letter-spacing:.01em}
img,svg{max-width:100%}
a{color:var(--brand);text-decoration:none}
a:hover{text-decoration:underline}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:10px 14px;border:1px solid var(--line);z-index:99}

/* ---------- header ---------- */
header.site{position:sticky;top:0;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:50}
.hbar{display:flex;align-items:center;gap:26px;min-height:70px}
.logo{display:flex;align-items:center;gap:11px;font-weight:700;font-size:19px;color:var(--ink);letter-spacing:0}
.logo:hover{text-decoration:none}
.logo .mark{width:34px;height:34px;flex:0 0 34px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-dark));color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;letter-spacing:0}
.logo .mark-img{width:36px;height:36px;flex:0 0 36px;object-fit:contain;border-radius:8px}
.logo .sub{display:block;font-size:11.5px;font-weight:500;color:var(--muted);letter-spacing:.06em;line-height:1.3}
nav.main{margin-left:auto;display:flex;align-items:center;gap:4px}
nav.main .item{position:relative}
nav.main .item>a{display:block;padding:10px 13px;font-size:15px;color:var(--ink);border-radius:9px;font-weight:500}
nav.main .item>a:hover{background:var(--soft);text-decoration:none}
nav.main .drop{position:absolute;top:100%;left:0;min-width:230px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 12px 32px rgba(16,32,56,.10);padding:8px;opacity:0;visibility:hidden;transform:translateY(6px);transition:.16s}
nav.main .item:hover .drop,nav.main .item:focus-within .drop{opacity:1;visibility:visible;transform:translateY(0)}
nav.main .drop a{display:block;padding:9px 12px;border-radius:8px;font-size:14.5px;color:var(--ink)}
nav.main .drop a:hover{background:var(--soft);text-decoration:none}
nav.main .drop a small{display:block;color:var(--muted);font-size:12.5px;line-height:1.5}
.btn{display:inline-block;padding:11px 20px;border-radius:10px;background:var(--brand);color:#fff;font-weight:600;font-size:15px}
.btn:hover{background:var(--brand-dark);text-decoration:none;color:#fff}
.btn.ghost{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn.ghost:hover{background:var(--soft);color:var(--brand-dark)}
.navbtn{margin-left:8px}
#navtoggle{display:none}
.burger{display:none;margin-left:auto;border:1px solid var(--line);border-radius:9px;background:#fff;padding:9px 12px;font-size:14px;cursor:pointer}

/* ---------- hero ---------- */
.hero{background:linear-gradient(180deg,#f7fafd 0%,#ffffff 100%);border-bottom:1px solid var(--line);padding:64px 0 56px}
.hero h1{font-size:clamp(27px,4.1vw,41px);line-height:1.34;margin:0 0 20px;letter-spacing:-.01em}
.hero .lead{font-size:18.5px;color:#33475e;max-width:830px;margin:0 0 26px}
.hero .actions{display:flex;flex-wrap:wrap;gap:12px}
.kicker{display:inline-block;font-size:13px;font-weight:600;letter-spacing:.1em;color:var(--accent);text-transform:uppercase;margin-bottom:14px}
.crumb{font-size:13.5px;color:var(--muted);margin-bottom:20px}
.crumb a{color:var(--muted)}
.crumb span{color:var(--muted);margin:0 7px}

/* ---------- sections ---------- */
main{display:block}
section{padding:56px 0;border-bottom:1px solid var(--line)}
section.tight{padding:38px 0}
section:last-of-type{border-bottom:0}
h2{font-size:clamp(22px,2.7vw,29px);line-height:1.4;margin:0 0 12px;letter-spacing:-.01em}
h3{font-size:19.5px;line-height:1.5;margin:0 0 8px}
h4{font-size:16.5px;margin:0 0 6px}
.sub{color:var(--muted);max-width:860px;margin:0 0 26px}
p{margin:0 0 15px}
ul,ol{margin:0 0 16px;padding-left:22px}
li{margin:6px 0}
strong{font-weight:600}
.small{font-size:14.5px;color:var(--muted)}

/* ---------- grid & cards ---------- */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card.soft{background:var(--soft)}
.card h3{margin-top:0;font-size:18.5px}
.card p:last-child{margin-bottom:0}
.card .tag{display:inline-block;font-size:12px;font-weight:600;color:var(--brand);background:#eaf1fa;border-radius:999px;padding:3px 10px;margin-bottom:11px;letter-spacing:.03em}
.card .more{margin-top:14px;font-size:14.5px;font-weight:600}
.card.link:hover{border-color:#c3d4ea;box-shadow:0 8px 22px rgba(16,32,56,.07)}
.card.link:hover h3{color:var(--brand)}

/* ---------- steps ---------- */
ol.steps{list-style:none;padding:0;counter-reset:s;margin:0}
ol.steps>li{counter-increment:s;position:relative;padding:0 0 22px 56px;border-left:2px solid var(--line);margin-left:19px}
ol.steps>li:last-child{border-left-color:transparent;padding-bottom:0}
ol.steps>li::before{content:counter(s);position:absolute;left:-20px;top:-2px;width:38px;height:38px;border-radius:50%;background:#fff;border:2px solid var(--brand);color:var(--brand);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px}
ol.steps h3{margin:4px 0 6px}
ol.steps p{margin:0}

/* ---------- table ---------- */
.tw{overflow-x:auto;margin:0 0 18px;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{border-collapse:collapse;width:100%;font-size:15px;min-width:560px}
th,td{text-align:left;padding:13px 15px;border-bottom:1px solid var(--line);vertical-align:top;line-height:1.7}
th{background:var(--soft);font-weight:600;font-size:14px;letter-spacing:.02em;white-space:nowrap}
tbody tr:last-child td{border-bottom:0}
td:first-child{font-weight:500}

/* ---------- faq ---------- */
.faq{margin:0}
.faq .qa{border:1px solid var(--line);border-radius:var(--radius);padding:20px 22px;margin-bottom:12px;background:#fff}
.faq .qa h3{font-size:17.5px;margin:0 0 8px;color:var(--ink)}
.faq .qa p:last-child{margin-bottom:0}

/* ---------- fact block ---------- */
.facts{border:1px dashed #c9d6e6;background:#fbfdff;border-radius:var(--radius);padding:22px}
.facts h3{margin:0 0 14px;font-size:16px;letter-spacing:.04em;color:var(--brand)}
.facts dl{display:grid;grid-template-columns:132px 1fr;gap:8px 16px;margin:0;font-size:15px}
.facts dt{color:var(--muted)}
.facts dd{margin:0}

/* ---------- callout ---------- */
.note{border-left:4px solid var(--accent);background:#fdf8f2;padding:16px 20px;border-radius:0 10px 10px 0;margin:0 0 18px}
.note p:last-child{margin-bottom:0}
.note.calm{border-left-color:var(--brand);background:var(--soft)}

/* ---------- quote ---------- */
.quote{border-left:4px solid var(--brand);background:var(--soft);margin:18px 0;padding:18px 24px;border-radius:0 10px 10px 0}
.quote p{margin:0;font-size:17px;color:var(--brand-dark)}

/* ---------- side topics ---------- */
.card .topics{display:flex;flex-direction:column;gap:16px}
.card .topics .t h4{margin:0 0 3px;font-size:15.5px;letter-spacing:0}
.card .topics .t p{margin:0 0 4px;font-size:14px;color:var(--muted);line-height:1.7}
.card .topics .t a{font-size:13px;font-weight:600;margin-right:10px;white-space:nowrap}
.demo{border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.demo .dhead{background:var(--soft);border-bottom:1px solid var(--line);padding:11px 16px;font-size:13.5px;font-weight:600;color:var(--muted);display:flex;justify-content:space-between;gap:12px}
.demo .dbody{padding:18px 20px}

/* ---------- CTA ---------- */
.cta{background:var(--brand-dark);color:#fff;border-radius:18px;padding:38px 34px;border:0}
.cta h2{color:#fff;margin-bottom:10px}
.cta p{color:#cfe0f4;max-width:760px}
.cta .actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:20px}
.cta .btn{background:#fff;color:var(--brand-dark)}
.cta .btn:hover{background:#e8f0fa;color:var(--brand-dark)}
.cta .btn.ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.cta .btn.ghost:hover{background:rgba(255,255,255,.12);color:#fff}
section.band{border-bottom:0;padding:44px 0 60px;background:#fff}

/* ---------- form ---------- */
form.q{display:grid;gap:16px;max-width:720px}
.field{display:grid;gap:7px}
.field label{font-size:14.5px;font-weight:600}
.field .hint{font-size:13px;color:var(--muted);font-weight:400}
input,select,textarea{font-family:inherit;font-size:15.5px;padding:12px 13px;border:1px solid #cfd8e3;border-radius:10px;background:#fff;color:var(--ink);width:100%}
input:focus,select:focus,textarea:focus{outline:2px solid #b9d0ec;outline-offset:1px;border-color:var(--brand)}
.check{display:flex;gap:10px;align-items:flex-start;font-size:14.5px;color:#33475e}
.check input{width:auto;margin-top:5px}

/* ---------- footer ---------- */
footer.site{background:#0d1a2b;color:#a9bdd4;padding:52px 0 30px;font-size:14.5px}
footer.site h4{color:#fff;font-size:14px;letter-spacing:.08em;margin:0 0 12px;text-transform:uppercase}
footer.site a{color:#c8d8ea}
footer.site a:hover{color:#fff}
footer.site .cols{display:grid;grid-template-columns:1.5fr 1fr 1fr 1.2fr;gap:32px}
footer.site ul{list-style:none;padding:0;margin:0}
footer.site li{margin:7px 0}
footer.site .brandline{color:#fff;font-weight:700;font-size:16px;margin-bottom:10px;display:block}
footer.site .legal{margin-top:34px;padding-top:20px;border-top:1px solid #24374f;display:flex;justify-content:space-between;gap:18px;flex-wrap:wrap;font-size:13.5px;color:#7f95ae}

/* ---------- responsive ---------- */
@media (max-width:1000px){
  .g4{grid-template-columns:repeat(2,1fr)}
  footer.site .cols{grid-template-columns:1fr 1fr}
}
@media (max-width:820px){
  .burger{display:block}
  nav.main{display:none;position:absolute;top:70px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;padding:12px 22px 20px;gap:2px;box-shadow:0 18px 30px rgba(16,32,56,.10);max-height:calc(100vh - 70px);overflow:auto}
  #navtoggle:checked ~ nav.main{display:flex}
  nav.main .item>a{padding:12px 6px;border-bottom:1px solid var(--line);border-radius:0}
  nav.main .drop{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;padding:0 0 8px 14px;min-width:0}
  nav.main .drop a{padding:9px 6px}
  .navbtn{margin:12px 0 0}
  .g3,.g2{grid-template-columns:1fr}
  .facts dl{grid-template-columns:1fr;gap:2px 0}
  .facts dt{margin-top:9px}
  .hero{padding:44px 0 40px}
  section{padding:42px 0}
}
@media (max-width:520px){
  footer.site .cols{grid-template-columns:1fr}
  .cta{padding:28px 22px}
}
@media print{header.site,footer.site,.cta .actions{display:none}}

.art{display:grid;grid-template-columns:minmax(0,1fr) 262px;gap:40px;align-items:start}
.art-body{min-width:0}
.art-body p{margin:0 0 16px;line-height:1.95}
.art-body h2{font-size:23px;margin:40px 0 14px;line-height:1.5;letter-spacing:-.01em}
.art-body h3{font-size:18.5px;margin:26px 0 10px}
.art-body ul,.art-body ol{margin:0 0 18px;padding-left:22px}
.art-body li{margin-bottom:9px;line-height:1.9}
.art-body strong{color:var(--ink)}
.art-body blockquote{margin:0 0 18px;padding:14px 20px;background:var(--soft);border-left:4px solid var(--brand);border-radius:0 10px 10px 0}
.art-side{position:sticky;top:86px;font-size:14.5px}
.toc{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:18px 20px;margin-bottom:16px;max-height:58vh;overflow:auto}
.toc strong{display:block;font-size:13px;letter-spacing:.08em;color:var(--muted);margin-bottom:10px}
.toc ol{margin:0;padding-left:18px}
.toc li{margin-bottom:7px;line-height:1.6}
.sidebox{border:1px solid var(--line);border-radius:var(--radius);background:var(--soft);padding:18px 20px;margin-bottom:16px}
.sidebox strong{display:block;font-size:13px;letter-spacing:.08em;color:var(--muted);margin-bottom:10px}
.sidebox ul{margin:0;padding-left:17px}
.sidebox li{margin-bottom:7px;line-height:1.6}
.pn{display:flex;gap:16px;justify-content:space-between;border-top:1px solid var(--line);padding-top:22px}
.pn a{flex:1;border:1px solid var(--line);border-radius:var(--radius);padding:16px 18px;font-weight:600}
.pn a:hover{text-decoration:none;border-color:#c3d4ea}
.pn a.next{text-align:right}
.pn small{display:block;font-size:12.5px;color:var(--muted);font-weight:500;margin-bottom:4px}
.mods{display:grid;gap:14px;grid-template-columns:repeat(auto-fill,minmax(282px,1fr))}
.mod{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:20px 22px}
.mod .n{display:inline-flex;width:26px;height:26px;border-radius:8px;background:#eaf1fa;color:var(--brand);font-weight:700;font-size:13px;align-items:center;justify-content:center;margin-bottom:10px}
.mod h3{margin:0 0 8px;font-size:17.5px}
.mod p{margin:0 0 10px;font-size:15px;line-height:1.85}
.mod .meta{font-size:13.5px;color:var(--muted)}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:0 0 18px}
.tags a{font-size:13.5px;border:1px solid var(--line);border-radius:999px;padding:5px 12px;background:#fff;color:#33475e}
.gl{display:grid;gap:12px}
.gl .it{border:1px solid var(--line);border-radius:var(--radius);background:#fff;padding:18px 20px}
.gl .it h3{margin:0 0 6px;font-size:17px}
.gl .it p{margin:0 0 8px;font-size:15px;line-height:1.9}
.gl .it .src{font-size:13.5px;color:var(--muted)}
/* 知识库文章列表 */
.alist{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.alist li{position:relative;padding:15px 0 15px 0;border-bottom:1px solid var(--line);margin:0;line-height:1.7}
.alist li a{font-weight:600;font-size:16.5px;display:inline}
.alist li .ad{display:inline-block;font-size:12.5px;color:var(--muted);margin-left:10px;white-space:nowrap}
.alist li .as{display:block;color:var(--muted);font-size:14.5px;margin-top:5px;line-height:1.7}
.alist li:hover{background:#fbfdff}
.idxstat{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 22px}
.idxstat span{font-size:13.5px;border:1px solid var(--line);border-radius:999px;padding:5px 13px;background:#fff;color:#33475e}
@media(max-width:980px){.art{grid-template-columns:1fr}.art-side{position:static;order:-1}.pn{flex-direction:column}}