:root{
  --teal:#0F766E;
  --teal-dark:#115E59;
  --amber:#F59E0B;
  --amber-soft:#FEF3C7;
  --ink:#1F2933;
  --muted:#52606D;
  --paper:#FCFBF7;
  --card:#FFFFFF;
  --line:#E4E7EB;
  --teal-soft:#E6F2F1;
  --ok:#0F766E;
  --err:#B91C1C;
  --err-soft:#FEE2E2;
  --shadow:0 1px 2px rgba(31,41,51,.06),0 8px 24px rgba(31,41,51,.06);
  --radius:14px;
  --maxw:1080px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  color:var(--ink);
  background:var(--paper);
  line-height:1.65;
  font-size:18px;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3{font-family:"Fraunces","Georgia",serif;line-height:1.18;color:var(--ink);font-weight:600}
h1{font-size:clamp(2rem,4.5vw,3rem);letter-spacing:-.01em;margin:0 0 .4em}
h2{font-size:clamp(1.5rem,3vw,2rem);margin:1.8em 0 .5em}
h3{font-size:1.25rem;margin:1.4em 0 .4em}
p{margin:0 0 1em}
a{color:var(--teal);text-decoration:underline;text-underline-offset:2px}
a:hover{color:var(--teal-dark)}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.skip{position:absolute;left:-999px}
.skip:focus{left:12px;top:12px;background:#fff;padding:10px 14px;border-radius:8px;z-index:99}

/* Header */
.site-head{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.site-head .wrap{display:flex;align-items:center;gap:18px;min-height:66px}
.brand{display:flex;align-items:center;gap:11px;text-decoration:none;color:var(--ink);font-weight:700;font-size:1.12rem}
.brand img{width:34px;height:34px}
.brand span b{color:var(--teal)}
.nav{margin-left:auto;display:flex;gap:4px;flex-wrap:wrap}
.nav a{font-size:.95rem;text-decoration:none;color:var(--muted);padding:8px 12px;border-radius:8px;font-weight:500}
.nav a:hover,.nav a[aria-current="page"]{background:var(--teal-soft);color:var(--teal-dark)}
.menu-btn{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 12px;font-size:1rem;cursor:pointer}

/* Hero */
.hero{background:linear-gradient(160deg,#E6F2F1 0%,#FCFBF7 60%);border-bottom:1px solid var(--line)}
.hero .wrap{padding:64px 22px 56px}
.eyebrow{font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;color:var(--teal);font-weight:700;margin:0 0 14px}
.hero p.lead{font-size:1.18rem;color:var(--muted);max-width:60ch}
.btnrow{display:flex;gap:12px;flex-wrap:wrap;margin-top:26px}
.btn{display:inline-block;background:var(--teal);color:#fff;text-decoration:none;padding:13px 22px;border-radius:10px;font-weight:600;border:none;cursor:pointer;font-size:1rem}
.btn:hover{background:var(--teal-dark);color:#fff}
.btn.ghost{background:transparent;color:var(--teal-dark);border:1.5px solid var(--teal)}
.btn.ghost:hover{background:var(--teal-soft)}

/* Sections */
main{padding:10px 0 40px}
.section{padding:14px 0}
.lead{font-size:1.1rem}

/* Card grid */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px;margin:26px 0}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);text-decoration:none;color:inherit;display:block;transition:transform .12s ease,box-shadow .12s ease}
.card:hover{transform:translateY(-3px);box-shadow:0 10px 30px rgba(15,118,110,.12)}
.card .tag{display:inline-block;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--amber);font-weight:700;margin-bottom:8px}
.card h3{margin:.1em 0 .35em}
.card p{color:var(--muted);font-size:.97rem;margin:0}

/* Prose blocks */
.prose{max-width:72ch}
.example{background:var(--teal-soft);border-left:4px solid var(--teal);border-radius:10px;padding:16px 20px;margin:14px 0}
.example b{color:var(--teal-dark)}
.signalwords{display:flex;flex-wrap:wrap;gap:8px;margin:16px 0}
.signalwords span{background:var(--amber-soft);color:#92400E;border-radius:999px;padding:6px 14px;font-size:.92rem;font-weight:600}
.callout{background:#fff;border:1px solid var(--line);border-radius:12px;padding:18px 22px;box-shadow:var(--shadow);margin:20px 0}

/* Reading text + quiz */
.readtext{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px 30px;box-shadow:var(--shadow);max-width:74ch;margin:20px 0}
.readtext h2{margin-top:0}
.quiz{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 28px;box-shadow:var(--shadow);max-width:74ch}
.quiz fieldset{border:none;margin:0;padding:0}
.quiz legend{font-family:"Fraunces",serif;font-size:1.2rem;font-weight:600;margin-bottom:14px;padding:0}
.opt{display:block;border:1.5px solid var(--line);border-radius:10px;padding:13px 16px;margin:9px 0;cursor:pointer;transition:border-color .12s,background .12s}
.opt:hover{border-color:var(--teal)}
.opt input{margin-right:10px}
.opt.correct{border-color:var(--ok);background:var(--teal-soft)}
.opt.wrong{border-color:var(--err);background:var(--err-soft)}
.feedback{margin-top:16px;border-radius:10px;padding:14px 18px;display:none;font-size:1rem}
.feedback.show{display:block}
.feedback.good{background:var(--teal-soft);border:1px solid var(--teal)}
.feedback.bad{background:var(--err-soft);border:1px solid #FCA5A5}
.feedback b{display:block;margin-bottom:4px}
.exnav{display:flex;justify-content:space-between;gap:12px;margin:32px 0 8px;flex-wrap:wrap}

/* FAQ */
details.faq{background:#fff;border:1px solid var(--line);border-radius:12px;padding:4px 20px;margin:10px 0;box-shadow:var(--shadow)}
details.faq summary{font-family:"Fraunces",serif;font-weight:600;font-size:1.1rem;cursor:pointer;padding:14px 0;list-style:none}
details.faq summary::-webkit-details-marker{display:none}
details.faq summary::after{content:"+";float:right;color:var(--teal);font-weight:700}
details.faq[open] summary::after{content:"–"}
details.faq p{color:var(--muted);margin:0 0 14px}

/* Lists */
.linklist{list-style:none;padding:0;margin:20px 0}
.linklist li{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin:10px 0;box-shadow:var(--shadow)}
.linklist a{font-weight:600;font-size:1.05rem}
.linklist p{margin:.3em 0 0;color:var(--muted);font-size:.95rem}

/* Footer */
.site-foot{background:#0E2A28;color:#CBD8D6;margin-top:50px}
.site-foot .wrap{padding:40px 22px;display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.site-foot h4{color:#fff;font-family:"Fraunces",serif;margin:0 0 12px;font-size:1.05rem}
.site-foot a{color:#9FD8D2;text-decoration:none}
.site-foot a:hover{text-decoration:underline}
.site-foot ul{list-style:none;padding:0;margin:0}
.site-foot li{margin:6px 0;font-size:.95rem}
.site-foot .made{font-size:.9rem;color:#7FA8A3}
.foot-bottom{border-top:1px solid #1C3F3C;text-align:center;padding:16px;font-size:.85rem;color:#7FA8A3}

@media(max-width:760px){
  body{font-size:17px}
  .nav{display:none;width:100%;flex-direction:column;order:3}
  .nav.open{display:flex}
  .menu-btn{display:block}
  .site-head .wrap{flex-wrap:wrap;min-height:auto;padding-top:10px;padding-bottom:10px}
  .site-foot .wrap{grid-template-columns:1fr;gap:24px}
}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto}}