:root{
  --ink:#14233b; --ink2:#2a3a53; --muted:#5d6b7a; --paper:#ffffff; --soft:#f4f7f8;
  --line:#e5eaee; --accent:#0f7c74; --accent-d:#0b5f59; --gold:#b5842c; --ok:#1f9d57;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
h1,h2,h3,.serif{font-family:'Newsreader','Georgia',serif;color:var(--ink);line-height:1.15;letter-spacing:-.01em}
a{color:var(--accent);text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.narrow{max-width:760px;margin:0 auto;padding:0 24px}
/* nav */
.nav{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav .wrap{display:flex;align-items:center;justify-content:space-between;height:66px}
.logo{font-family:'Newsreader',serif;font-weight:600;font-size:21px;color:var(--ink);display:flex;align-items:center;gap:9px}
.logo .mk{width:30px;height:30px;border-radius:8px;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;font-weight:600}
.nav .links{display:flex;gap:26px;align-items:center;font-size:14.5px}
.nav .links a{color:var(--ink)}.nav .links a:hover{color:var(--accent)}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:11px 20px;border-radius:8px;font-weight:600;font-size:14.5px;border:none;cursor:pointer;transition:.2s}
.btn:hover{background:var(--accent-d);color:#fff}
.btn-ghost{background:transparent;border:1.5px solid var(--line);color:var(--ink)}.btn-ghost:hover{border-color:var(--accent);color:var(--accent);background:transparent}
/* hero */
.hero{background:linear-gradient(180deg,#f4f7f8, #fff);border-bottom:1px solid var(--line);padding:72px 0 60px}
.hero .eyebrow{color:var(--accent);font-weight:700;font-size:13px;letter-spacing:1.6px;text-transform:uppercase}
.hero h1{font-size:52px;font-weight:500;margin:14px 0 16px;max-width:12ch}
.hero p{font-size:19px;color:var(--muted);max-width:56ch;margin-bottom:28px}
.search{display:flex;gap:10px;max-width:600px;background:#fff;border:1.5px solid var(--line);border-radius:12px;padding:8px 8px 8px 18px;box-shadow:0 10px 30px rgba(15,124,116,.08)}
.search input{flex:1;border:none;outline:none;font-size:16px;font-family:inherit;color:var(--ink);background:transparent}
.search input::placeholder{color:#9aa7b2}
.trust{display:flex;gap:24px;margin-top:22px;font-size:13.5px;color:var(--muted);flex-wrap:wrap}
.trust b{color:var(--ink)}
/* categories */
.sec{padding:64px 0}
.sec h2{font-size:32px;font-weight:500;margin-bottom:6px}
.sec .lede{color:var(--muted);margin-bottom:28px}
.cats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.cat{border:1px solid var(--line);border-radius:14px;padding:20px 18px;transition:.2s;background:#fff}
.cat:hover{border-color:var(--accent);box-shadow:0 12px 30px rgba(15,124,116,.09);transform:translateY(-2px)}
.cat .ic{width:40px;height:40px;border-radius:10px;background:var(--soft);color:var(--accent);display:flex;align-items:center;justify-content:center;margin-bottom:12px}
.cat b{display:block;color:var(--ink);font-size:16px;margin-bottom:3px}
.cat span{font-size:13px;color:var(--muted)}
/* featured questions */
.qlist{display:flex;flex-direction:column;gap:2px;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.q{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;background:#fff;border-bottom:1px solid var(--line);transition:.15s}
.q:last-child{border-bottom:none}
.q:hover{background:var(--soft)}
.q .qt{font-family:'Newsreader',serif;font-size:19px;color:var(--ink)}
.q .qm{font-size:12.5px;color:var(--muted);margin-top:3px}
.q .arw{color:var(--accent);font-size:20px;flex-shrink:0}
.tag{display:inline-block;font-size:11px;font-weight:600;letter-spacing:.4px;text-transform:uppercase;color:var(--accent);background:var(--soft);padding:3px 9px;border-radius:20px}
/* band */
.band{background:var(--ink);color:#fff;padding:56px 0}
.band h2{color:#fff;font-size:30px;font-weight:500;margin-bottom:10px}
.band p{color:#b9c6d4;max-width:60ch;margin:0 auto;text-align:center}
.band .wrap{text-align:center}
.band .row{display:flex;justify-content:center;gap:48px;margin-top:34px;flex-wrap:wrap}
.band .st b{font-family:'Newsreader',serif;font-size:40px;color:#fff;display:block}
.band .st span{font-size:13px;color:#9fb0c0;letter-spacing:.4px}
/* footer */
footer{background:#0e1a2c;color:#8ea0b2;font-size:14px;padding:48px 0 30px}
footer .grid{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:36px;margin-bottom:28px}
footer h4{color:#fff;font-size:12.5px;letter-spacing:1.2px;text-transform:uppercase;margin-bottom:12px}
footer a{color:#8ea0b2;display:block;margin-bottom:7px}footer a:hover{color:#fff}
footer .bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:18px;font-size:12.5px;color:#6b7d8f;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}
.demo{background:#14233b;color:#fff;text-align:center;font-size:12.5px;padding:7px;letter-spacing:.5px}
/* ---------- article (Q&A) page ---------- */
.crumb{background:var(--soft);border-bottom:1px solid var(--line);font-size:13px;color:var(--muted)}
.crumb .wrap{padding:12px 24px}
.art{padding:44px 0 24px}
.art h1{font-size:40px;font-weight:500;margin:10px 0 18px;max-width:22ch}
.byline{display:flex;align-items:center;gap:12px;padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:26px}
.byline .av{width:46px;height:46px;border-radius:50%;background:var(--accent);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:600;font-family:'Newsreader',serif;font-size:18px}
.byline b{color:var(--ink);font-size:15px}
.byline .meta{font-size:13px;color:var(--muted)}
.byline .rev{margin-left:auto;font-size:12.5px;color:var(--ok);font-weight:600;display:flex;align-items:center;gap:6px}
.answer{background:var(--soft);border-left:4px solid var(--accent);border-radius:0 12px 12px 0;padding:20px 24px;margin-bottom:26px}
.answer .lbl{font-size:12px;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.answer p{font-size:18px;color:var(--ink);margin:0}
.body-c{font-family:'Newsreader',serif;font-size:18.5px;line-height:1.72;color:#233247}
.body-c h2{font-size:26px;font-weight:500;margin:30px 0 10px}
.body-c p{margin-bottom:16px}
.body-c ul{margin:0 0 16px 22px}.body-c li{margin-bottom:7px}
.takeaways{background:#fff;border:1px solid var(--line);border-radius:12px;padding:20px 24px;margin:26px 0}
.takeaways b{font-family:'Inter',sans-serif;font-size:13px;letter-spacing:.5px;text-transform:uppercase;color:var(--accent)}
.sources{font-size:14px;color:var(--muted);border-top:1px solid var(--line);padding-top:18px;margin-top:30px;font-family:'Inter',sans-serif}
.sources li{margin-bottom:6px}
.consult{background:linear-gradient(120deg,var(--accent),var(--accent-d));color:#fff;border-radius:16px;padding:30px 32px;margin:34px 0;text-align:center}
.consult h3{color:#fff;font-size:26px;font-weight:500;margin-bottom:8px}
.consult p{color:#d7ede9;margin-bottom:18px}
.consult .btn{background:#fff;color:var(--accent-d)}.consult .btn:hover{background:#eafaf7}
.related{margin:36px 0}
.related h3{font-size:22px;font-weight:500;margin-bottom:14px}
@media(max-width:820px){.cats{grid-template-columns:1fr 1fr}.hero h1{font-size:38px}.footer .grid,footer .grid{grid-template-columns:1fr}.nav .links a:not(.btn){display:none}.art h1{font-size:30px}}
/* ---------- sitemap / architecture tree ---------- */
.tree{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.tnode{border:1px solid var(--line);border-radius:14px;padding:16px 18px;background:#fff}
.tnode h3{font-family:'Inter',sans-serif;font-size:15px;margin:0 0 10px;display:flex;flex-wrap:wrap;gap:8px;align-items:baseline}
.tnode h3 a{color:var(--ink)}.tnode h3 a:hover{color:var(--accent)}
.tnode ul{list-style:none;margin:0;padding:0}
.tnode li{display:flex;justify-content:space-between;gap:10px;padding:6px 0;border-bottom:1px solid var(--line);font-size:14px}
.tnode li:last-child{border-bottom:none}
.cnt{font-size:11.5px;color:var(--muted);font-weight:500;background:var(--soft);padding:2px 8px;border-radius:20px;white-space:nowrap}
@media(max-width:820px){.tree{grid-template-columns:1fr}}
/* ---------- imagery ---------- */
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
.hero-media img{width:100%;border-radius:18px;box-shadow:0 24px 60px rgba(15,124,116,.18);object-fit:cover;aspect-ratio:4/3}
.imgcats{grid-template-columns:repeat(4,1fr)}
.imgcats .cat{padding:0;overflow:hidden}
.imgcats .cat .thumb{width:100%;height:150px;object-fit:cover;display:block}
.imgcats .cat b{display:block;color:var(--ink);font-size:16px;margin:14px 18px 2px}
.imgcats .cat span{display:block;font-size:13px;color:var(--muted);margin:0 18px 16px}
.imgcats .cat:hover .thumb{opacity:.94}
.herobanner{position:relative;max-height:340px;overflow:hidden;border-bottom:1px solid var(--line)}
.herobanner img{width:100%;height:340px;object-fit:cover;display:block}
.herobanner.sm img{height:240px}
.herobanner .hbcap{position:absolute;left:0;right:0;bottom:0;padding:40px 24px 22px;background:linear-gradient(180deg,transparent,rgba(14,26,44,.82));color:#fff}
.herobanner .hbcap .wrap,.herobanner .hbcap{max-width:1080px;margin:0 auto}
.herobanner .hbcap h1{color:#fff;font-size:42px;font-weight:500;margin:4px 0 0;max-width:20ch}
.herobanner.sm .hbcap h1{font-size:32px}
@media(max-width:820px){.hero-grid{grid-template-columns:1fr}.hero-media{display:none}.imgcats{grid-template-columns:1fr 1fr}.herobanner img{height:220px}.herobanner .hbcap h1{font-size:28px}}
/* ---------- voice-note (Dr. Z audio answer + CTA) ---------- */
.voicecta{display:flex;align-items:center;gap:14px;flex-wrap:wrap;background:var(--soft);border:1px solid var(--line);border-left:4px solid var(--accent);border-radius:0 12px 12px 0;padding:14px 18px;margin:0 0 26px}
.voicecta .vlabel{font-weight:600;color:var(--accent-d);font-size:14.5px}
.voicecta audio{height:38px;max-width:100%}