/* [BRAND] — site styles
   Replace nothing here except the accent colour if you want. */

:root{
  --ink:#12212f;
  --ink-2:#3d5265;
  --ink-3:#6b7f91;
  --accent:#0f6fb8;
  --accent-dark:#0b568f;
  --accent-soft:#e8f2fb;
  --warn:#c2410c;
  --line:#e2e8ef;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --radius:10px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  color:var(--ink-2);
  background:var(--bg);
  line-height:1.7;
  font-size:16px;
}
h1,h2,h3,h4{color:var(--ink);line-height:1.3;font-weight:650}
p{margin-bottom:1rem}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img,svg{max-width:100%}

.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.narrow{max-width:720px;margin:0 auto;padding:0 24px}

/* ---------- header ---------- */
.site-header{
  border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.94);
  backdrop-filter:saturate(180%) blur(8px);
  position:sticky;top:0;z-index:50;
}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{font-weight:700;font-size:18px;color:var(--ink);letter-spacing:-.2px}
.logo span{color:var(--accent)}
.nav-links{display:flex;gap:26px;align-items:center;list-style:none}
.nav-links a{color:var(--ink-2);font-size:14.5px;font-weight:500}
.nav-links a:hover,.nav-links a.active{color:var(--accent);text-decoration:none}
.nav-toggle{display:none;background:none;border:0;font-size:22px;cursor:pointer;color:var(--ink)}

/* ---------- buttons ---------- */
.btn{
  display:inline-block;background:var(--accent);color:#fff;
  padding:12px 22px;border-radius:var(--radius);font-weight:600;font-size:15px;
  border:1px solid var(--accent);transition:.15s;text-decoration:none;
}
.btn:hover{background:var(--accent-dark);border-color:var(--accent-dark);text-decoration:none}
.btn-ghost{background:transparent;color:var(--accent);border:1px solid var(--accent)}
.btn-ghost:hover{background:var(--accent-soft);color:var(--accent-dark)}
.btn-sm{padding:8px 16px;font-size:14px}

/* ---------- hero ---------- */
.hero{padding:78px 0 64px;background:var(--bg-soft);border-bottom:1px solid var(--line)}
.hero h1{font-size:40px;margin-bottom:18px;letter-spacing:-.6px;max-width:820px}
.hero .lead{font-size:18px;color:var(--ink-2);max-width:680px;margin-bottom:28px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-note{margin-top:22px;font-size:14px;color:var(--ink-3)}

/* ---------- sections ---------- */
section{padding:64px 0}
section.alt{background:var(--bg-soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.eyebrow{font-size:12.5px;letter-spacing:1.6px;text-transform:uppercase;color:var(--accent);font-weight:700;margin-bottom:10px}
h2.section-title{font-size:29px;margin-bottom:12px}
.section-intro{font-size:17px;color:var(--ink-2);max-width:660px;margin-bottom:32px}

/* ---------- cards ---------- */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px;transition:.15s;
}
.card:hover{border-color:#c9d6e2;box-shadow:0 4px 16px rgba(18,33,47,.06)}
.card h3{font-size:17.5px;margin-bottom:8px}
.card p{font-size:14.5px;margin-bottom:0;color:var(--ink-2)}
.card .tag{
  display:inline-block;font-size:11.5px;font-weight:700;color:var(--accent);
  background:var(--accent-soft);padding:3px 9px;border-radius:20px;margin-bottom:12px;
}
.card-grid-icon{font-size:22px;margin-bottom:10px;color:var(--accent)}

/* ---------- check list ---------- */
ul.check{list-style:none;margin:18px 0}
ul.check li{padding-left:30px;position:relative;margin-bottom:11px}
ul.check li:before{
  content:"✓";position:absolute;left:0;top:0;color:var(--accent);font-weight:700;
}
ul.plain{margin:16px 0 16px 22px}
ul.plain li{margin-bottom:8px}

/* ---------- table ---------- */
table{width:100%;border-collapse:collapse;margin:22px 0;font-size:14.5px}
th{text-align:left;padding:11px 12px;background:var(--bg-soft);color:var(--ink);
   font-weight:650;font-size:13.5px;border-bottom:2px solid var(--line)}
td{padding:11px 12px;border-bottom:1px solid var(--line);vertical-align:top}
tr:last-child td{border-bottom:none}

/* ---------- callout ---------- */
.callout{
  background:var(--accent-soft);border-left:4px solid var(--accent);
  padding:18px 20px;border-radius:0 var(--radius) var(--radius) 0;margin:24px 0;
}
.callout p{margin:0;font-size:15px}
.callout.warn{background:#fff5ed;border-left-color:var(--warn)}

/* ---------- form ---------- */
.form-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:14px}
input[type=email],input[type=text],textarea{
  flex:1;min-width:220px;padding:12px 14px;border:1px solid var(--line);
  border-radius:var(--radius);font-size:15px;font-family:inherit;color:var(--ink);
}
input:focus,textarea:focus{outline:2px solid var(--accent-soft);border-color:var(--accent)}
textarea{width:100%;min-height:120px;resize:vertical}
.form-note{font-size:13px;color:var(--ink-3);margin-top:10px}

/* ---------- article ---------- */
.article{padding:56px 0}
.article-header{max-width:720px;margin:0 auto 34px}
.article-header h1{font-size:34px;margin-bottom:14px;letter-spacing:-.4px}
.article-meta{font-size:14px;color:var(--ink-3)}
.article-body{max-width:720px;margin:0 auto;font-size:16.5px}
.article-body h2{font-size:24px;margin:38px 0 12px}
.article-body h3{font-size:18.5px;margin:28px 0 8px}
.article-body ul{margin:14px 0 18px 22px}
.article-body li{margin-bottom:7px}
.article-body blockquote{
  border-left:3px solid var(--line);padding-left:18px;color:var(--ink-3);
  font-style:italic;margin:20px 0;
}
.article-cta{
  max-width:720px;margin:46px auto 0;background:var(--bg-soft);
  border:1px solid var(--line);border-radius:var(--radius);padding:26px;text-align:center;
}
.article-cta h3{margin-bottom:8px}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#a9bccd;padding:52px 0 28px;margin-top:0}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.site-footer a{color:#a9bccd}
.site-footer a:hover{color:#fff}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:32px;margin-bottom:34px}
.footer-bottom{
  border-top:1px solid rgba(255,255,255,.12);padding-top:20px;
  font-size:13.5px;color:#7d94a8;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
}
.site-footer ul{list-style:none}
.site-footer li{margin-bottom:8px;font-size:14.5px}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .grid-3{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:680px){
  .hero{padding:52px 0 44px}
  .hero h1{font-size:29px}
  h2.section-title{font-size:24px}
  .grid-2,.grid-3,.grid-4{grid-template-columns:1fr}
  .nav-links{
    display:none;position:absolute;top:66px;left:0;right:0;background:#fff;
    flex-direction:column;padding:16px 24px;gap:14px;border-bottom:1px solid var(--line);
  }
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .article-header h1{font-size:27px}
  .footer-grid{grid-template-columns:1fr}
}

/* ---- WhatsApp 浮动按钮 ---- */
.wa-fab{position:fixed;right:18px;bottom:18px;z-index:99;width:54px;height:54px;
  border-radius:50%;background:#25D366;display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 14px rgba(0,0,0,.28);transition:transform .15s ease}
.wa-fab:hover{transform:scale(1.07)}
.wa-fab svg{width:28px;height:28px;fill:#fff}
@media(max-width:560px){.wa-fab{right:14px;bottom:14px;width:50px;height:50px}}