/* ============================================================
   Dr.Bunlue · Longevity Clinic — design system (Prompt only)
   ============================================================ */
:root{
  --bg:#f5f2ea; --paper:#fcfbf7; --ink:#1e342c; --fg:#2d3a34; --muted:#79837b;
  --line:#e4ded1; --line-2:#d7cfbd; --green:#1e342c; --green-2:#355b4c;
  --gold:#a9844e; --gold-l:#c2a06a; --sage:#8ba593; --soft:#ece7da;
  --max:1180px;
  --sans:'Prompt',system-ui,-apple-system,'Segoe UI','Noto Sans Thai',sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--sans);font-weight:300;color:var(--fg);background:var(--bg);line-height:1.8;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--green-2);text-decoration:none}
a:hover{color:var(--gold)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 32px}
h1,h2,h3,h4{font-weight:500;letter-spacing:-.2px;color:var(--green);line-height:1.2;margin:0}
em{font-style:normal;color:var(--gold)}

/* helpers */
.label{display:inline-block;font-size:11.5px;letter-spacing:4px;text-transform:uppercase;color:var(--gold);font-weight:500}
.label.center{display:block;text-align:center}
.link-arrow{font-size:14px;letter-spacing:1px;color:var(--green);font-weight:400;border-bottom:1px solid var(--line-2);padding-bottom:3px}
.link-arrow:hover{color:var(--gold);border-color:var(--gold)}

/* buttons */
.btn{display:inline-block;background:var(--green);color:#fff;padding:14px 30px;border-radius:2px;font-weight:400;font-size:14.5px;letter-spacing:.4px;transition:.22s;border:1px solid var(--green)}
.btn:hover{background:#15271f;color:#fff;text-decoration:none}
.btn.line{background:transparent;color:var(--green);border-color:var(--line-2)}
.btn.line:hover{background:var(--green);color:#fff;border-color:var(--green)}
.btn.light{background:#fff;color:var(--green);border-color:#fff}
.btn.light:hover{background:var(--gold);color:#fff;border-color:var(--gold)}
.btn.ghost{background:transparent;color:var(--green);border-color:var(--line-2)}
.btn.ghost:hover{background:var(--green);color:#fff}

/* ---------- header ---------- */
.site-head{position:sticky;top:0;z-index:60;background:rgba(245,242,234,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.hd{display:flex;align-items:center;gap:24px;height:76px}
.brand{display:flex;align-items:center;gap:11px}
.brand .leaf{width:26px;height:26px;color:var(--green)}
.brand .bt{line-height:1.05}
.brand .bt b{font-size:22px;font-weight:600;color:var(--green);letter-spacing:.2px}
.brand .bt small{display:block;font-size:9px;letter-spacing:3px;color:var(--muted);font-weight:400}
.nav{display:flex;gap:2px;margin-left:auto;align-items:center}
.nav-item{position:relative}
.nav-item>a{color:var(--fg);font-size:14.5px;font-weight:300;padding:12px 14px;display:inline-block;white-space:nowrap}
.nav-item>a:hover{color:var(--green)}
.dropdown{position:absolute;top:100%;left:0;min-width:220px;background:var(--paper);border:1px solid var(--line);box-shadow:0 20px 44px rgba(30,52,44,.12);padding:10px;opacity:0;visibility:hidden;transform:translateY(8px);transition:.18s;z-index:70}
.nav-item.has-sub:hover .dropdown{opacity:1;visibility:visible;transform:translateY(0)}
.dropdown a{display:block;padding:10px 14px;color:var(--fg);font-size:14px}
.dropdown a:hover{background:var(--soft);color:var(--green)}
.hd-cta{font-size:13.5px;letter-spacing:1px;color:var(--green);border:1px solid var(--line-2);padding:10px 20px;border-radius:2px;white-space:nowrap;transition:.2s}
.hd-cta:hover{background:var(--green);color:#fff;border-color:var(--green)}

/* ---------- home: hero ---------- */
.lx-hero{max-width:var(--max);margin:0 auto;padding:72px 32px 84px;display:grid;grid-template-columns:1.08fr .92fr;gap:56px;align-items:center}
.lx-hero-copy{order:1}
.lx-hero-inner{max-width:540px}
.lx-hero h1{font-size:clamp(40px,4.6vw,58px);font-weight:500;line-height:1.1;margin:22px 0 22px}
.lx-hero .lede{font-size:18px;color:var(--muted);margin:0 0 32px;font-weight:300}
.lx-cta{display:flex;gap:14px;flex-wrap:wrap}
.lx-pillars{margin-top:42px;padding-top:26px;border-top:1px solid var(--line);display:flex;gap:16px;align-items:center;font-size:12px;letter-spacing:4px;color:var(--muted)}
.lx-pillars .dot{color:var(--gold)}
.lx-hero-media{order:2;display:flex;justify-content:flex-end}
.lx-hero-media img{width:100%;max-width:420px;aspect-ratio:4/5;object-fit:cover;object-position:center top;border-radius:3px;box-shadow:0 34px 70px rgba(30,52,44,.16)}

/* intro statement */
.lx-intro{padding:84px 0;text-align:center;border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--paper)}
.lx-statement{font-size:clamp(22px,2.7vw,30px);line-height:1.6;font-weight:300;color:var(--ink);max-width:880px;margin:22px auto 0}

/* section heads */
.lx-head{margin-bottom:46px;position:relative}
.lx-head h2{font-size:clamp(30px,3.6vw,42px);font-weight:500;line-height:1.14;margin:12px 0 0}
.lx-head.center{text-align:center}
.lx-head .link-arrow.top{position:absolute;right:0;bottom:6px}

/* approach */
.lx-approach{padding:90px 0}
.lx-steps{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line)}
.lx-step{padding:38px 36px 6px 0;border-right:1px solid var(--line)}
.lx-step:last-child{border-right:none;padding-right:0}
.lx-step .no{font-size:15px;color:var(--gold);font-weight:500;letter-spacing:2px}
.lx-step h3{font-size:25px;color:var(--green);font-weight:500;margin:10px 0 10px}
.lx-step p{color:var(--muted);font-size:15.5px;margin:0}

/* doctor split */
.lx-doctor{background:var(--green);color:#dfe8e1;padding:92px 0}
.lx-split{display:grid;grid-template-columns:440px 1fr;gap:60px;align-items:center}
.lx-split-img img{border-radius:3px;aspect-ratio:4/5;object-fit:cover;object-position:center top}
.lx-split-body .label{color:var(--gold-l)}
.lx-split-body h2{font-size:clamp(28px,3.4vw,40px);color:#fff;font-weight:500;line-height:1.18;margin:14px 0 18px}
.lx-split-body p{opacity:.85;margin:0 0 14px;font-weight:300}
.lx-doctor .link-arrow{color:#fff;border-color:rgba(255,255,255,.35)}
.lx-doctor .link-arrow:hover{color:var(--gold-l);border-color:var(--gold-l)}

/* science cards */
.lx-science{padding:92px 0;background:var(--paper);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.lx-sci-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:26px}
.lx-sci{display:block;background:var(--bg);border:1px solid var(--line);transition:.25s}
.lx-sci:hover{transform:translateY(-4px);box-shadow:0 24px 50px rgba(30,52,44,.1);text-decoration:none}
.lx-sci-img{aspect-ratio:16/10;overflow:hidden;background:var(--soft)}
.lx-sci-img img{width:100%;height:100%;object-fit:cover}
.lx-sci-cap{padding:22px 24px}
.lx-sci-cap h3{font-size:22px;color:var(--green);font-weight:500;margin:0 0 3px}
.lx-sci-cap span{font-size:11.5px;letter-spacing:2px;text-transform:uppercase;color:var(--muted)}

/* research */
.lx-research{padding:92px 0}

/* cta band */
.lx-band{background:var(--ink);color:#e7ede8;text-align:center;padding:90px 0}
.lx-band h2{font-size:clamp(28px,3.4vw,40px);color:#fff;font-weight:500;margin:0 0 12px}
.lx-band p{opacity:.8;margin:0 0 28px;font-weight:300}

/* ---------- shared cards (blog / articles) ---------- */
.grid{display:grid;gap:26px}
.grid.cols-3{grid-template-columns:repeat(3,1fr)}
.grid.cols-4{grid-template-columns:repeat(4,1fr)}
.card{border:1px solid var(--line);overflow:hidden;background:var(--paper);transition:.2s;display:flex;flex-direction:column}
.card:hover{transform:translateY(-4px);box-shadow:0 20px 44px rgba(30,52,44,.1);text-decoration:none}
.card .thumb{aspect-ratio:16/10;background:var(--soft);overflow:hidden}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .body{padding:18px 20px 22px;display:flex;flex-direction:column;gap:8px;flex:1}
.card .body h3{font-size:18px;line-height:1.4;margin:0;color:var(--green);font-weight:500}
.card .meta{font-size:12px;letter-spacing:.5px;color:var(--muted);margin-top:auto}
.ribbon{display:inline-block;background:var(--gold);color:#fff;font-size:11px;letter-spacing:1px;padding:3px 10px;width:fit-content}
.prod .thumb{aspect-ratio:1/1;background:#fff}
.prod .thumb img{object-fit:contain;padding:14px}

/* section titles (generic) */
.sec-title{font-size:clamp(28px,3.2vw,38px);color:var(--green);font-weight:500;line-height:1.16;margin:0 0 6px}
.sec-sub{color:var(--muted);margin:0 0 30px;font-size:16px;font-weight:300}

/* ---------- article / content pages ---------- */
.article{max-width:800px;margin:0 auto}
.article.page{max-width:820px}
.article h1{color:var(--green);font-weight:500;font-size:clamp(28px,4vw,42px);line-height:1.22;margin:6px 0 4px}
.article .post-meta{color:var(--muted);font-size:12.5px;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:10px}
.article .cover{overflow:hidden;margin:26px 0}
.article .content{font-size:17px;color:#3a463f;font-weight:300}
.article .content p{margin:0 0 20px}
.article .content h2{color:var(--green);font-size:27px;font-weight:500;line-height:1.3;margin:40px 0 14px}
.article .content h3{color:var(--green-2);font-size:22px;font-weight:500;margin:30px 0 10px}
.article .content h4{color:var(--green-2);font-size:18px;font-weight:500;margin:24px 0 8px}
.article .content ul,.article .content ol{padding-left:22px;margin:0 0 20px}
.article .content li{margin:8px 0}
.article .content figure{margin:26px 0}
.article .content figure img{width:100%;border-radius:3px}
.article .content figcaption{font-size:13px;color:var(--muted);margin-top:8px;text-align:center}
.article .content blockquote{border-left:3px solid var(--gold);background:var(--paper);margin:24px 0;padding:18px 26px;color:var(--ink)}
.article .content blockquote p{margin:0}
.article .content a{color:var(--green-2);border-bottom:1px solid var(--line-2)}
.article .content a:hover{color:var(--gold);border-color:var(--gold)}
.article .content pre{background:var(--ink);color:#e7ede8;padding:18px;overflow:auto;border-radius:4px;font-size:14px}
.back{display:inline-block;margin:34px 0 0;color:var(--green);font-weight:400;letter-spacing:.5px;border-bottom:1px solid var(--line-2);padding-bottom:3px}
.back:hover{color:var(--gold);border-color:var(--gold)}

/* sub-nav on content pages */
.subnav{display:flex;flex-wrap:wrap;gap:8px 18px;align-items:center;background:var(--paper);border:1px solid var(--line);border-radius:3px;padding:14px 20px;margin:8px 0 30px;font-size:14px}
.subnav-label{font-weight:500;color:var(--gold);letter-spacing:1px;text-transform:uppercase;font-size:11.5px}
.subnav a{color:var(--muted)}
.subnav a.active{color:var(--green);font-weight:500}

/* articles listing */
.search-bar{margin:0 0 26px}
.search-bar input{width:100%;max-width:440px;padding:13px 18px;border:1px solid var(--line-2);border-radius:2px;font-family:inherit;font-size:15px;background:var(--paper)}
.search-bar input:focus{outline:none;border-color:var(--green-2)}
.count{color:var(--muted);font-size:12.5px;letter-spacing:1px;margin:0 0 22px;text-transform:uppercase}

/* simple page wrappers */
main>.wrap>section{padding:62px 0}
.article.page{padding:12px 0 20px}

/* ---------- BioAge calculator ---------- */
.bioage{max-width:900px;margin:0 auto;text-align:center}
.bioage .kicker{letter-spacing:4px;color:var(--gold);font-size:11.5px;font-weight:500;text-transform:uppercase;margin:0 0 8px;display:block}
.bioform{display:grid;grid-template-columns:1fr 1fr;gap:16px;text-align:left;margin:32px 0 10px;background:var(--paper);border:1px solid var(--line);padding:30px}
.bioform .field{display:flex;flex-direction:column;gap:6px}
.bioform label{font-size:13px;color:var(--muted)}
.bioform input{padding:12px 14px;border:1px solid var(--line-2);border-radius:2px;font-family:inherit;font-size:15px;background:#fff}
.bioform input:focus{outline:none;border-color:var(--green-2)}
.bioform button{grid-column:1/-1;justify-self:center;margin-top:10px;cursor:pointer;font-size:15px}
.bioresult{margin:26px auto;max-width:560px;padding:28px;background:var(--paper);border:1px solid var(--green-2)}
.bioresult .big{font-size:24px;color:var(--green);font-weight:500}
.bioresult .cmp{color:var(--muted);margin-top:6px}
.bioresult .tone-msg{font-weight:500;margin:12px 0}
.bioresult.good{border-color:var(--sage);background:#eef5f0}
.bioresult.bad{border-color:var(--gold);background:#f7f1e6}
.bioresult.warn{border-color:#c0392b;background:#fbeeec;color:#a3372b}
.disclaimer{color:var(--muted);font-size:13px;max-width:660px;margin:18px auto 0}
.bioage .sec-title{text-align:center}

/* about step cards */
.brand-logo{text-align:center;margin:24px 0}
.brand-logo img{max-width:240px;margin:0 auto;display:inline-block}
.about-steps{display:grid;grid-template-columns:repeat(4,1fr);margin:32px 0;border:1px solid var(--line)}
.step-card{padding:34px 22px;text-align:center;border-right:1px solid var(--line)}
.step-card:last-child{border-right:none}
.step-card:nth-child(even){background:var(--paper)}
.step-card h3{color:var(--green);margin:0 0 10px;font-size:21px;font-weight:500}
.step-card p{color:var(--muted);margin:0;font-size:14.5px;line-height:1.6}

/* ---------- footer ---------- */
.site-foot{background:var(--ink);color:#9fb0a7;padding:72px 0 34px;font-size:14px}
.foot-top{display:grid;grid-template-columns:2.2fr 1fr 1.3fr;gap:44px;margin-bottom:40px}
.foot-brand .foot-logo{margin-bottom:16px}
.foot-brand .brand .leaf{color:#fff}
.foot-brand .brand .bt b{color:#fff;font-size:22px}
.foot-brand .brand .bt small{color:#8fa39a}
.foot-brand p{max-width:420px;opacity:.85;font-weight:300}
.pillars-mini{margin-top:16px;font-size:11px;letter-spacing:4px;color:var(--gold-l)}
.foot-col h4{color:#fff;font-size:17px;font-weight:500;margin-bottom:14px}
.foot-col div{margin:7px 0}
.site-foot a{color:#c3cfc8}
.site-foot a:hover{color:var(--gold-l)}
.barami{margin-top:14px;font-size:11px;letter-spacing:3px;color:#8fa39a}
.foot-copy{border-top:1px solid rgba(255,255,255,.1);padding-top:22px;opacity:.6;letter-spacing:.5px}

/* ---------- responsive ---------- */
@media(max-width:980px){
  .lx-hero{grid-template-columns:1fr;gap:36px;padding:48px 32px 56px}
  .lx-hero-media{order:1;justify-content:center}
  .lx-hero-media img{max-width:320px}
  .lx-hero-copy{order:2}
  .lx-split{grid-template-columns:1fr;gap:30px}
  .lx-sci-grid,.grid.cols-3,.grid.cols-4{grid-template-columns:1fr 1fr}
  .lx-steps{grid-template-columns:1fr;border-top:none}
  .lx-step{border-right:none;border-top:1px solid var(--line);padding:30px 0 6px}
  .about-steps{grid-template-columns:1fr 1fr}
  .bioform{grid-template-columns:1fr}
  .foot-top{grid-template-columns:1fr}
}
@media(max-width:760px){.nav,.hd-cta{display:none}.hd{height:64px}}
@media(max-width:560px){
  .lx-sci-grid,.grid.cols-3,.grid.cols-4,.about-steps{grid-template-columns:1fr}
  .wrap{padding:0 20px}
}