/* ===== 诺必达 · 静态站样式（A 现站风格精修） ===== */
:root{
  --blue:#3b6ef5;
  --blue-deep:#2b55c8;
  --blue-ink:#0f1f44;
  --blue-100:#e9f0ff;
  --blue-50:#f4f8ff;
  --hero-a:#c2d6ff;
  --hero-b:#8fb0ff;
  --hero-c:#6b8fff;
  --text:#1b2b4b;
  --muted:#5c6d8f;
  --line:#e2eaf8;
  --white:#fff;
  --radius:18px;
  --shadow:0 10px 30px rgba(23,52,120,.08);
  --shadow-lg:0 20px 50px rgba(23,52,120,.14);
  --max:1180px;
  --header-h:72px;
  --font:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC","Source Han Sans SC",-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--font);color:var(--text);background:var(--white);
  font-size:16px;line-height:1.85;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-deep)}
h1,h2,h3,h4{color:var(--blue-ink);line-height:1.35;margin:0 0 .6em;font-weight:700;letter-spacing:-.2px}
h1{font-size:clamp(28px,3.4vw,44px)}
h2{font-size:clamp(22px,2.4vw,30px)}
h3{font-size:19px}
p{margin:0 0 1em}
ul,ol{padding-left:1.3em}
.container{max-width:var(--max);margin:0 auto;padding:0 22px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:#05173c;
  border-bottom:1px solid rgba(255,255,255,.10);transition:.25s}
.site-header.scrolled{background:#04122f;border-bottom-color:rgba(255,255,255,.18);
  box-shadow:0 10px 30px rgba(3,10,28,.35)}
/* 有 banner 的页面（首页等）：照旧站做法，header 透明，露出下方 banner 的蓝底 */
body.has-hero .site-header{position:absolute;left:0;right:0;background:transparent;
  border-bottom-color:transparent;box-shadow:none}
body.has-hero .site-header.scrolled{background:transparent;box-shadow:none;border-bottom-color:transparent}
body.has-hero .hero .hero-in{padding-top:calc(var(--header-h) + 42px)}
body.has-hero .hero-sm .hero-in{padding-top:calc(var(--header-h) + 26px)}
.header-in{max-width:var(--max);margin:0 auto;padding:0 22px;height:var(--header-h);
  display:flex;align-items:center;gap:26px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand img{height:46px;width:auto}
.nav{margin-left:auto;display:flex;align-items:center;gap:4px}
.nav a{padding:10px 14px;border-radius:10px;color:rgba(255,255,255,.88);font-size:15px;font-weight:500;
  display:inline-flex;align-items:center;gap:6px;transition:.18s}
.nav a:hover,.nav a.active{background:rgba(255,255,255,.14);color:#fff}
.nav .has-sub{position:relative}
.nav .sub{position:absolute;top:100%;left:0;min-width:230px;background:#fff;border:1px solid var(--line);
  border-radius:14px;box-shadow:var(--shadow-lg);padding:8px;display:none;flex-direction:column}
.nav .has-sub:hover .sub{display:flex}
.nav .sub a{padding:9px 12px;border-radius:9px;font-size:14.5px;white-space:nowrap;color:var(--blue-ink)}
.nav .sub a:hover,.nav .sub a.active{background:var(--blue-100);color:var(--blue-deep)}
.site-header .nav a.cta{background:var(--blue);color:#fff;font-weight:600;margin-left:8px;
  padding:10px 20px;border-radius:999px;box-shadow:0 8px 18px rgba(59,110,245,.28)}
.site-header .nav a.cta:hover{background:#4a7bff;color:#fff}
.nav-toggle{display:none;margin-left:auto;border:1px solid rgba(255,255,255,.28);background:transparent;
  border-radius:10px;padding:8px 12px;font-size:18px;color:#fff}
@media(max-width:960px){
  .nav{display:none;position:absolute;top:var(--header-h);left:0;right:0;background:#05173c;
       flex-direction:column;align-items:stretch;padding:12px 18px 18px;border-bottom:1px solid rgba(255,255,255,.14);
       box-shadow:0 18px 34px rgba(3,10,28,.35);gap:2px}
  .nav.open{display:flex}
  .nav .sub{position:static;display:flex;border:0;box-shadow:none;padding:0 0 0 12px;min-width:0;background:transparent}
  .nav .sub a{color:rgba(255,255,255,.82)}
  .nav .sub a:hover,.nav .sub a.active{background:rgba(255,255,255,.12);color:#fff}
  .nav-toggle{display:block}
  .site-header .nav a.cta{margin:10px 0 0;text-align:center;justify-content:center}
}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;color:var(--blue-ink);
  background:linear-gradient(135deg,var(--hero-a) 0%,var(--hero-b) 52%,var(--hero-c) 100%)}
.hero::after{content:"";position:absolute;inset:auto -10% -55% 55%;height:420px;
  background:radial-gradient(ellipse at center,rgba(255,255,255,.55),rgba(255,255,255,0) 62%);pointer-events:none}
.hero-in{max-width:var(--max);margin:0 auto;padding:64px 22px 68px;display:grid;
  grid-template-columns:1.15fr .85fr;gap:40px;align-items:center;position:relative;z-index:1}
.hero h1{color:#0d2d63}
.hero .sub{font-size:clamp(17px,1.7vw,21px);font-weight:600;color:#1c3a76;margin:0 0 10px}
.hero .kicker{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.6);
  color:#1c3a76;font-size:13.5px;font-weight:600;padding:6px 14px;border-radius:999px;margin-bottom:18px}
.hero .lead{color:#27437a;font-size:16.5px;max-width:640px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.hero-img{border-radius:22px;overflow:hidden;box-shadow:0 24px 60px rgba(22,43,102,.22);background:#fff}
@media(max-width:900px){
  .hero-in{grid-template-columns:1fr;padding:44px 20px 48px}
  .hero-img{order:-1;max-width:520px}
}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:999px;
  padding:13px 26px;font-weight:600;font-size:15.5px;border:1px solid transparent;transition:.2s;cursor:pointer}
.btn-primary{background:var(--blue);color:#fff;box-shadow:0 10px 24px rgba(59,110,245,.3)}
.btn-primary:hover{background:var(--blue-deep);color:#fff;transform:translateY(-1px)}
.btn-light{background:#fff;color:var(--blue-deep);box-shadow:0 10px 24px rgba(22,43,102,.14)}
.btn-light:hover{color:var(--blue-deep);transform:translateY(-1px)}
.btn-ghost{border-color:rgba(13,45,99,.28);color:#0d2d63;background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.5);color:var(--blue-ink)}

/* ---------- sections ---------- */
.section{padding:64px 0}
.section.alt{background:var(--blue-50)}
.section.tight{padding:40px 0}
.section-head{max-width:760px;margin:0 auto 36px;text-align:center}
.section-head p{color:var(--muted);margin:0}
.prose{max-width:860px;margin:0 auto;color:#2a3a5c;font-size:16.5px}
.prose h2{margin-top:1.6em;padding-left:14px;border-left:5px solid var(--blue);border-radius:2px}
.prose h3{margin-top:1.4em;font-size:18.5px}
.prose img{border-radius:14px;margin:22px auto;box-shadow:var(--shadow)}
.prose ul,.prose ol{background:var(--blue-50);border:1px solid var(--line);border-radius:14px;padding:18px 22px 18px 40px}
.prose li{margin:.35em 0}
.prose table{width:100%;border-collapse:collapse;margin:22px 0;font-size:15px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--blue-50)}
.prose blockquote{margin:22px 0;padding:14px 20px;background:var(--blue-50);border-left:4px solid var(--blue-100);
  border-radius:0 12px 12px 0;color:var(--muted)}

/* ---------- cards / grids ---------- */
.grid{display:grid;gap:18px;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));margin:8px 0 26px}
.grid.dense{grid-template-columns:repeat(auto-fit,minmax(198px,1fr))}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:26px 24px;
  box-shadow:var(--shadow);transition:.22s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:#cfdcf8}
.card .ico{width:46px;height:46px;border-radius:13px;background:var(--blue-100);display:flex;
  align-items:center;justify-content:center;margin-bottom:14px}
.card .ico img{width:26px;height:26px}
.card h3{margin-bottom:8px;font-size:18px}
.card p{color:var(--muted);font-size:14.8px;margin:0 0 14px}
.card .more{margin-top:auto;font-size:14px;font-weight:600}
.feature-list{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.iconlist{list-style:none;padding:0;margin:0 0 22px;display:grid;gap:10px;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}
.iconlist li{position:relative;padding-left:30px;color:#2a3a5c;font-size:15.5px}
.iconlist li::before{content:"";position:absolute;left:0;top:.62em;width:16px;height:9px;
  border-left:2.5px solid var(--blue);border-bottom:2.5px solid var(--blue);transform:rotate(-45deg)}
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin:28px 0}
.stat{background:#fff;border:1px solid var(--line);border-radius:16px;padding:20px;text-align:center;box-shadow:var(--shadow)}
.stat b{display:block;font-size:32px;color:var(--blue);line-height:1.2}
.stat span{color:var(--muted);font-size:14px}

/* ---------- faq ---------- */
.faq{max-width:860px;margin:0 auto}
.faq details{background:#fff;border:1px solid var(--line);border-radius:14px;padding:0 20px;margin-bottom:12px;box-shadow:var(--shadow)}
.faq summary{cursor:pointer;list-style:none;padding:16px 0;font-weight:600;color:var(--blue-ink);display:flex;
  justify-content:space-between;gap:14px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--blue);font-size:22px;font-weight:400;line-height:1}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 0 18px;color:var(--muted);font-size:15px}

/* ---------- article ---------- */
.article-head{padding:44px 0 10px;background:linear-gradient(180deg,var(--blue-50),#fff)}
.breadcrumb{font-size:13.5px;color:var(--muted);margin-bottom:14px}
.breadcrumb a{color:var(--muted)}
.breadcrumb span{margin:0 6px;opacity:.6}
.article-head h1{max-width:900px;margin-bottom:14px}
.meta{display:flex;gap:16px;flex-wrap:wrap;color:var(--muted);font-size:13.5px}
.article-body{max-width:860px;margin:0 auto;padding:34px 22px 10px;font-size:16.5px;color:#2a3a5c}
.article-body h2{margin-top:1.8em;padding-left:14px;border-left:5px solid var(--blue)}
.article-body h3{margin-top:1.5em}
.article-body img{border-radius:14px;margin:24px auto;box-shadow:var(--shadow)}
.article-body ul,.article-body ol{background:var(--blue-50);border:1px solid var(--line);border-radius:14px;
  padding:18px 22px 18px 40px}
.article-body table{width:100%;border-collapse:collapse;margin:22px 0;font-size:15px}
.article-body th,.article-body td{border:1px solid var(--line);padding:10px 12px}
.article-body th{background:var(--blue-50)}
.tagline{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.tag{background:var(--blue-100);color:var(--blue-deep);font-size:13px;padding:5px 12px;border-radius:999px}

/* ---------- list ---------- */
.post-list{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));margin:10px 0 30px}
.post-item{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;
  box-shadow:var(--shadow);display:flex;flex-direction:column;transition:.2s}
.post-item:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.post-item .thumb{aspect-ratio:16/9;background:var(--blue-100);overflow:hidden}
.post-item .thumb img{width:100%;height:100%;object-fit:cover}
.post-item .body{padding:18px 20px 20px;display:flex;flex-direction:column;flex:1}
.post-item h3{font-size:17px;margin:0 0 8px;line-height:1.55}
.post-item time{color:var(--muted);font-size:13px;margin-top:auto;padding-top:10px}
.pager{display:flex;gap:8px;justify-content:center;margin:26px 0}
.pager a,.pager span{min-width:38px;height:38px;display:inline-flex;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:10px;font-size:14px;color:var(--blue-ink);background:#fff}
.pager .cur{background:var(--blue);color:#fff;border-color:var(--blue)}

/* ---------- cta band ---------- */
.cta-band{background:linear-gradient(120deg,#12244f,#20408f 60%,#2f5fe0);color:#fff;padding:56px 0;margin-top:10px}
.cta-band .in{display:flex;align-items:center;gap:28px;justify-content:space-between;flex-wrap:wrap}
.cta-band h2{color:#fff;margin:0 0 6px}
.cta-band p{color:#c6d6ff;margin:0}

/* ---------- footer ---------- */
.site-footer{background:var(--blue-ink);color:#c3cfe8;padding:52px 0 22px;font-size:14.5px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:30px}
.site-footer h4{color:#fff;font-size:15px;margin-bottom:14px}
.site-footer a{color:#c3cfe8;display:block;padding:4px 0}
.site-footer a:hover{color:#fff}
.site-footer .about{color:#93a6c9;max-width:320px}
.footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:14px}
.footer-brand img{height:44px;filter:brightness(0) invert(1);opacity:.95}
.copyright{border-top:1px solid rgba(255,255,255,.12);margin-top:36px;padding-top:18px;
  display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;color:#8fa2c4;font-size:13px}
.copyright a{display:inline;padding:0;color:inherit;border-bottom:1px solid rgba(255,255,255,.28)}
.copyright a:hover{color:#fff;border-bottom-color:#fff}
@media(max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}}

/* ---------- contact form ---------- */
.form-card{background:#fff;border:1px solid var(--line);border-radius:20px;padding:30px;box-shadow:var(--shadow-lg)}
.field{margin-bottom:16px}
.field label{display:block;font-size:14px;font-weight:600;margin-bottom:6px}
.field input,.field textarea,.field select{width:100%;padding:12px 14px;border:1px solid var(--line);
  border-radius:11px;font-family:inherit;font-size:15px;background:#fbfdff;color:var(--text)}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);
  box-shadow:0 0 0 3px rgba(59,110,245,.12);background:#fff}
.field textarea{min-height:120px;resize:vertical}
.form-note{font-size:12.5px;color:var(--muted);margin-top:10px}
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:34px;align-items:start}
@media(max-width:860px){.contact-grid{grid-template-columns:1fr}}
.info-item{display:flex;gap:14px;padding:16px 0;border-bottom:1px dashed var(--line)}
.info-item b{display:block;color:var(--blue-ink);font-size:15px}
.info-item span{color:var(--muted);font-size:14.5px}

/* ---------- misc ---------- */
.badge{display:inline-block;background:var(--blue-100);color:var(--blue-deep);font-size:12.5px;
  font-weight:600;padding:4px 11px;border-radius:999px}
.center{text-align:center}
.mt0{margin-top:0}
.mb0{margin-bottom:0}

/* ---------- renderer additions ---------- */
.hero-sm .hero-in{padding:46px 22px 50px}
.hero-art{display:flex;align-items:center;justify-content:center}
.hero-art img{width:100%;max-width:520px;filter:drop-shadow(0 18px 40px rgba(20,45,110,.18))}
.card-img{border-radius:12px;margin-bottom:14px;width:100%;aspect-ratio:16/10;object-fit:cover;background:var(--blue-50)}
.cdesc{color:var(--muted);font-size:14.8px}
.cdesc p:last-child{margin-bottom:0}
a.card{color:inherit}
a.card h3{color:var(--blue-ink)}
a.card .more{color:var(--blue);font-size:14px;font-weight:600;margin-top:auto;padding-top:12px}
.card .more{display:block}
.map{border-radius:16px;margin-top:18px;box-shadow:var(--shadow)}
.stats{margin:26px 0 6px}
.grid + h2,.grid + .prose{margin-top:26px}
.blk-h{margin-top:6px}
.prose > .grid{margin-top:4px}
.section > .container > .prose:only-child{max-width:860px;margin:0 auto}
@media(max-width:900px){.hero-art{max-width:420px;margin:0 auto}}

/* world map panel */
.map-panel{background:linear-gradient(135deg,#0f1f44,#1b3570 65%,#24509f);border-radius:22px;
  padding:18px 18px 10px;margin:28px 0;box-shadow:0 24px 50px rgba(15,31,68,.22)}
.map-panel img{border-radius:14px;margin:0;box-shadow:none;width:100%}
.map-panel figcaption{color:#a8bce4;font-size:13.5px;text-align:center;padding:12px 0 6px;letter-spacing:.3px}
/* case cards */
.grid .card h3{font-size:16.5px;margin-bottom:8px;min-height:2.7em}
.grid .card .cdesc{font-size:14.5px;line-height:1.75}
.grid .card .cdesc em{color:var(--muted);font-style:normal;font-size:13.5px}

/* related reading */
.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:stretch}
.related-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:24px 26px 14px;box-shadow:var(--shadow);display:flex;flex-direction:column}
.related-card h3{font-size:17px;margin:0 0 10px;padding-bottom:12px;border-bottom:1px solid var(--line)}
.related-list{list-style:none;padding:0;margin:0}
.related-list li{display:flex;align-items:baseline;gap:14px;justify-content:space-between;
  padding:11px 0;border-bottom:1px dashed var(--line)}
.related-list li:last-child{border-bottom:0}
.related-list a{flex:1;color:var(--blue-ink);font-size:15px;font-weight:500;line-height:1.6}
.related-list a:hover{color:var(--blue)}
.related-list time{color:var(--muted);font-size:13px;white-space:nowrap}
@media(max-width:820px){.related-grid{grid-template-columns:1fr}}

/* 文章正文里的宽表格：手机端横向滚动，避免整页被撑宽 */
@media (max-width:900px){
  .article-body table{display:block;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
}