/* ===== Design tokens ===== */
:root{
  --bg:#f5f8fc; --panel:#fff; --text:#18324a; --muted:#6f8092; --line:#dfe8f2;
  --accent:#2f80ed; --accent2:#56b4ff; --shadow:0 10px 30px rgba(31,65,96,.08);
  --radius:16px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;line-height:1.65}
.wrap{width:min(1180px,calc(100% - 32px));margin:auto}
img{max-width:100%}

/* ===== Header / nav ===== */
.site-header{background:#fff;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.nav{min-height:70px;display:flex;align-items:center;gap:20px}
.brand{font-weight:900;letter-spacing:.08em;color:var(--text);text-decoration:none;font-size:20px;white-space:nowrap}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:4px;width:38px;height:38px;border:1px solid var(--line);border-radius:8px;background:#fff;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:var(--text);border-radius:2px}
#siteNav{display:flex;align-items:center;gap:6px;flex:1}
#siteNav>a{color:var(--muted);text-decoration:none;padding:10px 4px;font-weight:600}
#siteNav>a:hover{color:var(--accent)}
.nav-dropdown{position:relative}
.nav-dropdown-btn{background:none;border:0;font:inherit;font-weight:600;color:var(--muted);cursor:pointer;padding:10px 4px;display:flex;align-items:center;gap:4px}
.nav-dropdown-btn:hover{color:var(--accent)}
.nav-dropdown-menu{display:none;position:absolute;top:100%;left:0;min-width:240px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:var(--shadow);padding:8px;flex-direction:column;z-index:40}
.nav-dropdown.open .nav-dropdown-menu,.nav-dropdown:hover .nav-dropdown-menu{display:flex}
.nav-dropdown-menu a{padding:9px 10px;border-radius:8px;color:var(--text);text-decoration:none;font-size:14.5px}
.nav-dropdown-menu a:hover{background:var(--bg);color:var(--accent)}
.search{display:flex;gap:8px}
.search input{width:170px}
.search input,.search button,.btn{border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:#fff;font:inherit}
.search button,.btn{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border:0;font-weight:700;text-decoration:none;cursor:pointer}
.search.big{max-width:560px;margin:0 0 30px}
.search.big input{width:100%}

/* ===== Breadcrumb ===== */
.breadcrumb-bar{background:#fff;border-bottom:1px solid var(--line);font-size:13.5px}
.breadcrumb-bar .wrap{padding:10px 0;color:var(--muted)}
.breadcrumb-bar a{color:var(--muted);text-decoration:none}
.breadcrumb-bar a:hover{color:var(--accent)}
.breadcrumb-bar .sep{margin:0 8px;color:#c3d1de}
.breadcrumb-bar span:last-child{color:var(--text)}

/* ===== Hero ===== */
.hero{margin:42px 0 24px;padding:55px;border-radius:24px;background:linear-gradient(135deg,#eaf4ff,#fff);box-shadow:var(--shadow)}
.hero h1{font-size:clamp(32px,5vw,54px);line-height:1.1;margin:8px 0}
.hero p{color:var(--muted);font-size:18px;max-width:680px}
.hero-stats{display:flex;gap:34px;margin-top:26px;flex-wrap:wrap}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats strong{font-size:26px;color:var(--accent)}
.hero-stats span{color:var(--muted);font-size:13px;text-transform:uppercase;letter-spacing:.06em}

.eyebrow,.category{font-size:12px;text-transform:uppercase;letter-spacing:.1em;font-weight:800;color:var(--accent);text-decoration:none;display:inline-block}
.section-head{display:flex;justify-content:space-between;align-items:end;margin:44px 0 18px;gap:12px;flex-wrap:wrap}
.section-head h1,.section-head h2{margin:0}
.section-head a{color:var(--accent);text-decoration:none;font-weight:700}

/* ===== Category grid (homepage) ===== */
.category-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:50px}
.category-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);text-decoration:none;color:var(--text);display:flex;flex-direction:column;gap:6px;transition:transform .18s ease,box-shadow .18s ease}
.category-card:hover{transform:translateY(-4px);box-shadow:0 16px 34px rgba(31,65,96,.12)}
.category-card-icon{font-size:30px}
.category-card-name{font-weight:800;font-size:18px}
.category-card-desc{color:var(--muted);font-size:14px;flex:1}
.category-card-count{color:var(--accent);font-size:12.5px;font-weight:700;text-transform:uppercase;letter-spacing:.04em}

.category-hero{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow);margin-top:36px;display:block}
.category-hero h1{margin:6px 0}
.category-hero p{color:var(--muted);max-width:680px}
.category-hero small{color:var(--muted)}

/* ===== Article / result cards ===== */
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:50px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:18px;overflow:hidden;box-shadow:var(--shadow);display:flex;flex-direction:column;opacity:1;transform:none;transition:transform .5s ease,opacity .5s ease}
.card.reveal{opacity:0;transform:translateY(16px)}
.card.reveal.in{opacity:1;transform:none}
.thumb{height:170px;display:block;background:linear-gradient(135deg,#dceeff,#f7fbff);position:relative;overflow:hidden}
.thumb img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s ease}
.card:hover .thumb img{transform:scale(1.05)}
.thumb-fallback{position:absolute;inset:0;display:grid;place-items:center;font-weight:900;letter-spacing:.1em;color:#7ba4ca}
.card-body{padding:20px;display:flex;flex-direction:column;gap:6px;flex:1}
.card h3{margin:4px 0;font-size:20px;line-height:1.3}
.card h3 a,.result h2 a{color:var(--text);text-decoration:none}
.card p,.result p{color:var(--muted);margin:0}
.card small{color:#8ba0b4;font-size:12.5px;margin-top:auto;padding-top:8px}

.ad-slot{min-height:90px;margin:24px 0;border:1px dashed #cbd9e8;border-radius:12px;display:grid;place-items:center;color:#8ba0b4;font-size:12px;overflow:hidden}

/* ===== Hub cards (homepage) ===== */
.hub-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:50px}
.hub-card{background:linear-gradient(160deg,#f2f8ff,#fff);border:1px solid var(--line);border-radius:var(--radius);padding:26px;text-decoration:none;color:var(--text);box-shadow:var(--shadow);transition:transform .18s ease}
.hub-card:hover{transform:translateY(-4px)}
.hub-card-icon{font-size:28px}
.hub-card h3{margin:10px 0 6px}
.hub-card p{color:var(--muted);margin:0;font-size:14.5px}

/* ===== Feature / trust grid ===== */
.feature-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:56px}
.feature{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-align:left}
.feature span{font-size:26px}
.feature h3{margin:10px 0 6px;font-size:16.5px}
.feature p{color:var(--muted);font-size:14px;margin:0}

/* ===== Article page ===== */
.article-layout{display:grid;grid-template-columns:1fr 260px;gap:44px;max-width:1080px;margin:48px auto;align-items:start}
.article-main{min-width:0}
.article{max-width:800px;margin:48px auto}
.article h1,.article-main h1{font-size:clamp(30px,4.6vw,48px);line-height:1.16;margin-top:14px}
.meta{color:var(--muted);margin:10px 0 24px;font-size:14.5px}
.content{font-size:17px}
.content h2{margin-top:36px;scroll-margin-top:90px;font-size:26px}
.content h3{margin-top:24px;font-size:19px}
.content img.article-image{max-width:100%;border-radius:14px;margin:18px 0;display:block}
.content ul{padding-left:22px}
.content li{margin:6px 0}

.quick-facts{background:#f2f8ff;border:1px solid #d8eaff;border-radius:14px;padding:18px 22px;margin:22px 0}
.quick-facts h3{margin:0 0 8px;font-size:14px;text-transform:uppercase;letter-spacing:.06em;color:var(--accent)}
.quick-facts ul{margin:0;padding-left:20px}
.quick-facts li{margin:4px 0}

.faq-item{border-top:1px solid var(--line);padding:16px 0}
.faq-item h3{margin:0 0 6px;font-size:17px}
.faq-item p{margin:0;color:var(--muted)}

.toc{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.toc h2{margin:0 0 10px;font-size:14px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.toc ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}
.toc a{color:var(--text);text-decoration:none;font-size:14px}
.toc a:hover{color:var(--accent)}
.toc-desktop{position:sticky;top:90px}
.toc-mobile{display:none;margin:22px 0}

.related-articles{margin-top:50px}
.related-articles h2{margin-bottom:18px}
.related-articles .grid{margin-bottom:20px}

.share-note{padding:18px;background:#eef6ff;border:1px solid #d8eaff;border-radius:14px;margin-top:30px}

/* ===== Hub pages (page-in-page navigation) ===== */
.hub-group{margin:34px 0}
.hub-group h2{margin-bottom:14px}
.hub-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.hub-link{display:flex;flex-direction:column;gap:4px;background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px 18px;text-decoration:none;color:var(--text);box-shadow:var(--shadow);transition:transform .15s ease}
.hub-link:hover{transform:translateX(4px);color:var(--accent)}
.hub-link-title{font-weight:700}
.hub-link-desc{color:var(--muted);font-size:13.5px}

/* ===== Search / results ===== */
.results{max-width:850px}
.result{padding:24px 0;border-bottom:1px solid var(--line)}
.verify{max-width:600px;margin:70px auto;background:#fff;border:1px solid var(--line);padding:40px;border-radius:20px;box-shadow:var(--shadow)}

/* ===== Footer ===== */
footer{margin-top:80px;background:#fff;border-top:1px solid var(--line);padding:44px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr repeat(4,1fr);gap:26px}
.footer-grid h4{margin:0 0 12px;font-size:13px;text-transform:uppercase;letter-spacing:.06em;color:var(--muted)}
.footer-grid a{display:block;color:var(--muted);text-decoration:none;padding:4px 0;font-size:14.5px}
.footer-grid a:hover{color:var(--accent)}
.footer-about p{color:var(--muted);font-size:14.5px}
.copyright{text-align:center;color:var(--muted);padding:22px 0;margin-top:30px;border-top:1px solid var(--line);font-size:13.5px}

/* ===== Responsive ===== */
@media(max-width:980px){
  .article-layout{grid-template-columns:1fr}
  .toc-desktop{display:none}
  .toc-mobile{display:block}
  .feature-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media(max-width:850px){
  .nav{padding:12px 0;position:relative}
  .nav-toggle{display:flex}
  #siteNav{position:absolute;top:100%;left:0;right:0;background:#fff;border:1px solid var(--line);border-radius:0 0 14px 14px;flex-direction:column;align-items:stretch;padding:10px;display:none;box-shadow:var(--shadow)}
  #siteNav.open{display:flex}
  #siteNav>a{padding:12px 10px}
  .nav-dropdown-menu{position:static;box-shadow:none;border:0;padding:0 0 0 10px}
  .search{margin-left:auto}
  .grid,.category-grid,.hub-cards{grid-template-columns:repeat(2,1fr)}
  .hub-grid{grid-template-columns:1fr}
}
@media(max-width:560px){
  .wrap{width:min(calc(100% - 22px),1180px)}
  .grid,.category-grid,.hub-cards,.feature-grid,.footer-grid{grid-template-columns:1fr}
  .hero{padding:30px 22px}
  .hero-stats{gap:22px}
  .search input{width:120px}
  .article,.article-layout{margin:30px auto}
}