:root{
  --bg:#F4F8F8; --ink:#463F36; --head:#15151A; --head2:#1A1B1F;
  --teal:#45C4B8; --teal-deep:#0F6259; --teal-light:#BDDBDD;
  --muted:#7C7264; --foot:#5B5E66; --line:#E2E8E8; --white:#ffffff;
  --maxw:720px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);
  font-family:"Archivo",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  font-size:17px;line-height:1.62;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3{font-family:"Cormorant Garamond",Georgia,serif;color:var(--head);font-weight:600;line-height:1.12;letter-spacing:.2px}
h1{font-size:clamp(2.1rem,5vw,3.5rem);margin:.2em 0 .35em}
h2{font-size:clamp(1.55rem,3.3vw,2.1rem);margin:2.2em 0 .5em}
h3{font-size:1.25rem;margin:1.6em 0 .4em;color:var(--head2)}
p{margin:0 0 1.05em}
a{color:var(--teal-deep);text-decoration:none;font-weight:600}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

/* reading progress */
.progress{position:fixed;top:0;left:0;height:3px;width:0;background:var(--teal);z-index:60;transition:width .1s linear}

/* sticky bar */
.bar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.92);
  backdrop-filter:saturate(1.1) blur(8px);border-bottom:1px solid var(--line)}
.bar .wrap{max-width:1080px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;
  gap:16px;padding:14px 20px}
.brand{font-family:"Cormorant Garamond",serif;font-size:1.28rem;font-weight:600;color:var(--head);letter-spacing:.3px;display:inline-flex;align-items:center}
.brand span{color:var(--teal-deep)}
.brand img{height:40px;width:auto;display:block}
.navr{display:flex;align-items:center;gap:18px;font-size:.92rem}
.navr a{color:var(--ink)}
.pill{background:var(--teal);color:#101014 !important;border-radius:99px;padding:9px 18px;font-weight:700;white-space:nowrap}
.pill:hover{filter:brightness(.96);text-decoration:none}

/* hero */
.hero{background:radial-gradient(1100px 620px at 50% -12%,rgba(189,219,221,.55),rgba(255,255,255,0) 60%),var(--white);
  border-bottom:1px solid var(--line)}
.hero .wrap{max-width:var(--maxw);margin:0 auto;padding:54px 20px 30px;text-align:center}
.kick{font-family:"Archivo",sans-serif;font-size:.74rem;font-weight:700;letter-spacing:.14em;
  text-transform:uppercase;color:var(--teal-deep);margin-bottom:14px}
.hero p.sub{font-size:1.12rem;color:var(--muted);max-width:60ch;margin:0 auto}
.byline{margin-top:20px;font-size:.86rem;color:var(--muted);display:flex;gap:10px;align-items:center;justify-content:center;flex-wrap:wrap}
.byline img{width:34px;height:34px;border-radius:50%;object-fit:cover;border:1px solid var(--line);object-position:center 20%}
.byline a{color:var(--muted)}

/* breadcrumb */
.crumb{max-width:var(--maxw);margin:0 auto;padding:14px 20px 0;font-size:.8rem;color:var(--muted)}
.crumb a{color:var(--muted);font-weight:500}

/* article */
.post{max-width:var(--maxw);margin:0 auto;padding:12px 20px 10px}
.lead{font-size:1.2rem;line-height:1.55;color:var(--head2)}
.answer{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);
  border-radius:12px;padding:18px 20px;margin:22px 0 10px}
.answer .lbl{font-size:.72rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-deep);margin-bottom:6px}
.answer p{margin:0;font-size:1.04rem;color:var(--head2)}
.post ul,.post ol{margin:0 0 1.15em;padding-left:1.25em}
.post li{margin:.34em 0}
.note{background:rgba(69,196,184,.08);border:1px solid rgba(69,196,184,.35);border-radius:12px;padding:16px 18px;margin:1.3em 0;font-size:.98rem}
.note b{color:var(--head2)}
.def{border-left:3px solid var(--teal-light);padding:4px 0 4px 16px;margin:1.2em 0;color:var(--head2)}
.def .t{font-weight:700;color:var(--head2)}
.tablewrap{overflow-x:auto;margin:1.3em 0}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--line);vertical-align:top}
th{font-family:"Archivo",sans-serif;font-weight:700;color:var(--head2);background:rgba(189,219,221,.18)}
.small{font-size:.84rem;color:var(--muted)}

/* faq */
.faq{max-width:var(--maxw);margin:10px auto 0;padding:10px 20px 6px}
.faq h2{margin-top:1.2em}
details{border:1px solid var(--line);border-radius:12px;background:#fff;margin:10px 0;overflow:hidden}
details summary{cursor:pointer;list-style:none;padding:16px 18px;font-weight:700;color:var(--head2);
  display:flex;justify-content:space-between;align-items:center;gap:14px}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";color:var(--teal-deep);font-size:1.3rem;font-weight:700;line-height:1}
details[open] summary::after{content:"\2013"}
details .ans{padding:0 18px 16px;color:var(--ink)}
details .ans p{margin:.2em 0 .7em}

/* related cluster */
.related{max-width:var(--maxw);margin:26px auto 0;padding:0 20px}
.related h2{font-size:1.5rem;margin:.2em 0 .6em}
.rgrid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.rcard{display:block;border:1px solid var(--line);border-radius:12px;background:#fff;padding:14px 16px;color:var(--ink);font-weight:600}
.rcard:hover{border-color:var(--teal);text-decoration:none}
.rcard .k{display:block;font-family:"Archivo",sans-serif;font-size:.68rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--teal-deep);margin-bottom:5px}
.rcard .tt{font-family:"Cormorant Garamond",serif;font-size:1.15rem;color:var(--head2);font-weight:600;line-height:1.2}

/* final cta */
.final{background:radial-gradient(900px 500px at 50% 120%,rgba(189,219,221,.5),rgba(255,255,255,0) 60%),var(--white);
  border-top:1px solid var(--line);margin-top:34px}
.final .wrap{max-width:var(--maxw);margin:0 auto;padding:46px 20px;text-align:center}
.final h2{margin:.1em 0 .3em}
.final p{color:var(--muted);max-width:52ch;margin:0 auto 20px}

/* author box */
.authorbox{max-width:var(--maxw);margin:30px auto 0;padding:0 20px}
.authorbox .inner{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px}
.authorbox img{width:66px;height:66px;border-radius:50%;object-fit:cover;flex:0 0 auto;border:1px solid var(--line)}
.authorbox .nm{font-family:"Cormorant Garamond",serif;font-size:1.3rem;color:var(--head2);font-weight:600}
.authorbox .rl{font-size:.82rem;color:var(--teal-deep);font-weight:700;margin:2px 0 6px}
.authorbox p{font-size:.92rem;color:var(--ink);margin:0}
.authorbox a{font-size:.88rem}

/* footer */
footer{background:var(--bg);color:var(--foot);border-top:1px solid var(--line);margin-top:40px}
footer .wrap{max-width:1080px;margin:0 auto;padding:30px 20px;font-size:.86rem;display:flex;flex-wrap:wrap;gap:10px 26px;justify-content:space-between}
footer a{color:var(--foot);font-weight:500}
footer .nap{color:var(--muted)}

@media(max-width:620px){
  .rgrid{grid-template-columns:1fr}
  .hero .wrap{padding:38px 18px 24px}
  body{font-size:16px}
}