/* =========================================================
   Brownstone Research — shared stylesheet
   Light / editorial theme · lung & heart health blog
   ========================================================= */

:root{
  --teal:#2f9aa0;        /* lungs */
  --teal-dark:#0f5a5e;
  --teal-soft:#e9f6f7;
  --coral:#d6455b;       /* heart */
  --coral-dark:#a5203a;
  --coral-soft:#fdeef0;
  --green:#37995a;       /* botanical accent */
  --ink:#1f2a37;         /* main text */
  --muted:#5b6b7b;       /* secondary text */
  --line:#e4e9ee;        /* borders */
  --bg:#ffffff;
  --bg-soft:#f5f8fa;
  --bg-band:#f0f6f7;
  --gold:#e0a12e;
  --cta:#e5533b;
  --cta-dark:#c53f28;
  --radius:16px;
  --shadow:0 10px 30px rgba(24,49,66,.08);
  --shadow-lg:0 20px 50px rgba(24,49,66,.14);
  --serif:Georgia,'Times New Roman',serif;
  --sans:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --wrap:1120px;
  --read:760px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  line-height:1.7;
  font-size:18px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;height:auto;display:block}
a{color:var(--teal-dark);text-decoration:none}
a:hover{text-decoration:underline}

.wrap{max-width:var(--wrap);margin-inline:auto;padding-inline:22px}
.read{max-width:var(--read);margin-inline:auto;padding-inline:22px}
.band{background:var(--bg-band)}
.soft{background:var(--bg-soft)}

/* ---------- Header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.92);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--line);
}
.nav{display:flex;align-items:center;gap:18px;padding:12px 22px;max-width:var(--wrap);margin-inline:auto}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:700;font-size:1.15rem;color:var(--ink)}
.brand:hover{text-decoration:none}
.brand img{width:38px;height:38px;border-radius:10px}
.brand small{display:block;font-family:var(--sans);font-weight:500;font-size:.62rem;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.nav-links{display:flex;gap:20px;margin-left:auto;flex-wrap:wrap}
.nav-links a{color:var(--muted);font-size:.95rem;font-weight:600}
.nav-links a:hover{color:var(--teal-dark);text-decoration:none}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;background:var(--cta);color:#fff;font-weight:700;
  padding:15px 30px;border-radius:999px;font-size:1.05rem;line-height:1.2;
  box-shadow:0 8px 20px rgba(229,83,59,.32);transition:transform .12s ease,box-shadow .12s ease;
  border:0;cursor:pointer;text-align:center;
}
.btn:hover{transform:translateY(-2px);box-shadow:0 12px 26px rgba(229,83,59,.42);text-decoration:none;color:#fff}
.btn-lg{padding:18px 40px;font-size:1.18rem}
.btn-ghost{background:transparent;color:var(--teal-dark);box-shadow:none;border:2px solid var(--teal)}
.btn-ghost:hover{background:var(--teal-soft);color:var(--teal-dark)}
.btn-wrap{text-align:center;margin:26px 0}
.btn-note{display:block;margin-top:10px;font-size:.85rem;color:var(--muted)}

/* ---------- Hero ---------- */
.hero{padding:56px 0 40px}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center;max-width:var(--wrap);margin-inline:auto;padding-inline:22px}
.eyebrow{display:inline-block;font-size:.78rem;letter-spacing:.16em;text-transform:uppercase;font-weight:700;color:var(--teal);background:var(--teal-soft);padding:6px 14px;border-radius:999px}
.hero h1{font-family:var(--serif);font-size:clamp(2rem,4.4vw,3.1rem);line-height:1.12;margin:16px 0 14px}
.hero p.lede{font-size:1.18rem;color:var(--muted);margin:0 0 24px}
.hero-art{border-radius:24px;overflow:hidden;box-shadow:var(--shadow-lg)}

/* ---------- Section headings ---------- */
.section{padding:52px 0}
.section h2{font-family:var(--serif);font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.2;margin:0 0 8px}
.section .sub{color:var(--muted);margin:0 0 28px;font-size:1.05rem}
.center{text-align:center}
.center .sub{max-width:640px;margin-inline:auto;margin-bottom:28px}

/* ---------- Article cards ---------- */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.card{
  background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;display:flex;flex-direction:column;box-shadow:var(--shadow);
  transition:transform .14s ease,box-shadow .14s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.card .thumb{background:var(--bg-band);aspect-ratio:16/10;overflow:hidden}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .card-body{padding:20px 22px 24px;display:flex;flex-direction:column;gap:8px;flex:1}
.tag{align-self:flex-start;font-size:.72rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;padding:4px 10px;border-radius:999px}
.tag-tofu{background:var(--teal-soft);color:var(--teal-dark)}
.tag-mofu{background:#eef7ef;color:var(--green)}
.tag-bofu{background:var(--coral-soft);color:var(--coral-dark)}
.card h3{font-family:var(--serif);font-size:1.22rem;line-height:1.25;margin:2px 0 0}
.card p{color:var(--muted);font-size:.98rem;margin:0}
.card .more{margin-top:auto;font-weight:700;color:var(--teal-dark)}

/* ---------- Breadcrumb ---------- */
.crumbs{font-size:.86rem;color:var(--muted);padding:18px 0 0}
.crumbs a{color:var(--muted)}
.crumbs a:hover{color:var(--teal-dark)}

/* ---------- Article prose ---------- */
.article{padding:14px 0 40px}
.article h1{font-family:var(--serif);font-size:clamp(1.9rem,3.8vw,2.7rem);line-height:1.15;margin:14px 0 12px}
.byline{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:.92rem;margin:0 0 8px;flex-wrap:wrap}
.byline .dot{width:4px;height:4px;border-radius:50%;background:#c7d0d8}
.prose{font-size:1.06rem}
.prose h2{font-family:var(--serif);font-size:1.7rem;margin:38px 0 12px;line-height:1.25}
.prose h3{font-family:var(--serif);font-size:1.3rem;margin:28px 0 8px}
.prose p{margin:0 0 18px}
.prose ul,.prose ol{margin:0 0 18px;padding-left:22px}
.prose li{margin:8px 0}
.prose figure{margin:26px 0}
.prose figure img{border-radius:14px;box-shadow:var(--shadow)}
.prose figcaption{font-size:.85rem;color:var(--muted);text-align:center;margin-top:8px}
.prose a{color:var(--teal-dark);text-decoration:underline;text-underline-offset:2px}

/* ---------- Quick Answer (GEO/AEO) ---------- */
.answer{
  background:linear-gradient(180deg,#f2fafb,#eef7f8);
  border:1px solid #d5ebed;border-left:5px solid var(--teal);
  border-radius:14px;padding:22px 24px;margin:22px 0 30px;
}
.answer h2{margin:0 0 8px;font-family:var(--sans);font-size:1.02rem;text-transform:uppercase;letter-spacing:.08em;color:var(--teal-dark)}
.answer p{margin:0;font-size:1.08rem}

/* ---------- Callout ---------- */
.callout{background:var(--coral-soft);border:1px solid #f6d4da;border-radius:14px;padding:18px 22px;margin:24px 0}
.callout.teal{background:var(--teal-soft);border-color:#d5ebed}
.callout strong{color:var(--coral-dark)}
.callout.teal strong{color:var(--teal-dark)}

/* ---------- Key facts / stat row ---------- */
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:26px 0}
.stat{background:var(--bg-soft);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center}
.stat .n{font-family:var(--serif);font-size:1.9rem;color:var(--teal-dark);font-weight:700}
.stat .l{font-size:.86rem;color:var(--muted)}

/* ---------- Pros / cons ---------- */
.proscons{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:26px 0}
.pc{border-radius:14px;padding:20px 22px;border:1px solid var(--line)}
.pc.pros{background:#f1faf3;border-color:#cfead6}
.pc.cons{background:#fff5f2;border-color:#f6d9cf}
.pc h3{margin:0 0 10px;font-family:var(--sans);font-size:1.05rem}
.pc ul{list-style:none;margin:0;padding:0}
.pc li{position:relative;padding-left:28px;margin:10px 0;font-size:.98rem}
.pc.pros li:before{content:"✓";position:absolute;left:0;color:var(--green);font-weight:800}
.pc.cons li:before{content:"–";position:absolute;left:2px;color:var(--coral);font-weight:800}

/* ---------- Product card (review) ---------- */
.product{position:relative;background:radial-gradient(120% 120% at 50% 0,#ffffff, #f4f9fa);border:1px solid var(--line);border-radius:20px;padding:28px;text-align:center;margin:26px 0;box-shadow:var(--shadow)}
.product img{margin:0 auto;max-width:340px}
.product h3{font-family:var(--serif);font-size:1.5rem;margin:8px 0 4px}
.stars{color:var(--gold);font-size:1.2rem;letter-spacing:2px}
.rating-line{color:var(--muted);font-size:.9rem}

/* ---------- Feature list ---------- */
.feat{list-style:none;margin:22px 0;padding:0;display:grid;gap:12px}
.feat li{display:flex;gap:12px;align-items:flex-start;background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:14px 16px}
.feat .ico{flex:0 0 34px;width:34px;height:34px;border-radius:9px;display:grid;place-items:center;font-weight:800;color:#fff;background:var(--teal)}
.feat .ico.h{background:var(--coral)}
.feat b{display:block}
.feat span{color:var(--muted);font-size:.95rem}

/* ---------- Pricing ---------- */
.pricing{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin:26px 0}
.price{background:var(--bg);border:1px solid var(--line);border-radius:16px;padding:22px;text-align:center;position:relative;display:flex;flex-direction:column}
.price.popular{border-color:var(--cta);box-shadow:0 12px 30px rgba(229,83,59,.16)}
.price .badge{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--cta);color:#fff;font-size:.72rem;font-weight:700;letter-spacing:.06em;text-transform:uppercase;padding:5px 14px;border-radius:999px;white-space:nowrap}
.price h4{margin:6px 0 2px;font-family:var(--serif);font-size:1.2rem}
.price .supply{color:var(--muted);font-size:.9rem}
.price .amt{font-family:var(--serif);font-size:2.2rem;color:var(--ink);margin:12px 0 0}
.price .per{color:var(--muted);font-size:.85rem}
.price .was{color:#9aa6b1;text-decoration:line-through;font-size:.9rem;margin-top:4px}
.price img{max-width:130px;margin:8px auto 4px}
.price .btn{margin-top:16px}

/* ---------- Guarantee ---------- */
.guarantee{display:flex;gap:20px;align-items:center;background:var(--teal-soft);border:1px solid #d5ebed;border-radius:16px;padding:22px 24px;margin:26px 0}
.guarantee img{width:96px;height:96px;flex:0 0 96px}
.guarantee p{margin:0}

/* ---------- Score bars ---------- */
.scores{margin:26px 0}
.score{margin:14px 0}
.score .top{display:flex;justify-content:space-between;font-size:.95rem;margin-bottom:6px}
.score .track{background:#eaeef1;border-radius:999px;height:10px;overflow:hidden}
.score .fill{height:100%;border-radius:999px;background:linear-gradient(90deg,var(--teal),var(--teal-dark))}
.score .fill.h{background:linear-gradient(90deg,var(--coral),var(--coral-dark))}

/* ---------- Testimonials ---------- */
.quotes{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:26px 0}
.quote{background:var(--bg-soft);border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:12px;padding:18px 20px;margin:0}
.quote p{margin:0 0 10px;font-style:italic}
.quote cite{color:var(--muted);font-size:.88rem;font-style:normal;font-weight:700}

/* ---------- FAQ ---------- */
.faq{margin:26px 0}
.faq details{border:1px solid var(--line);border-radius:12px;margin:10px 0;background:var(--bg);overflow:hidden}
.faq summary{cursor:pointer;padding:16px 20px;font-weight:700;list-style:none;display:flex;justify-content:space-between;gap:12px;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary:after{content:"+";color:var(--teal);font-size:1.4rem;line-height:1}
.faq details[open] summary:after{content:"–"}
.faq .a{padding:0 20px 18px;color:var(--muted)}

/* ---------- Reference / trust strip ---------- */
.refs{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:14px}
.refs a{background:var(--bg);border:1px solid var(--line);border-radius:999px;padding:10px 18px;font-size:.9rem;color:var(--muted);font-weight:600}
.refs a:hover{border-color:var(--teal);color:var(--teal-dark);text-decoration:none}
.trust{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:8px}
.trust .t{text-align:center;padding:12px}
.trust .t .ic{width:52px;height:52px;margin:0 auto 10px;border-radius:14px;display:grid;place-items:center;background:var(--teal-soft);color:var(--teal-dark);font-size:1.5rem}
.trust .t b{display:block;font-size:1rem}
.trust .t span{color:var(--muted);font-size:.9rem}

/* ---------- Author box ---------- */
.authorbox{display:flex;gap:18px;align-items:flex-start;background:var(--bg-soft);border:1px solid var(--line);border-radius:16px;padding:22px;margin:34px 0}
.authorbox .av{flex:0 0 64px;width:64px;height:64px;border-radius:50%;background:var(--teal);display:grid;place-items:center;color:#fff;font-family:var(--serif);font-size:1.5rem;font-weight:700}
.authorbox b{font-size:1.05rem}
.authorbox p{margin:6px 0 0;color:var(--muted);font-size:.95rem}

/* ---------- Next-step (funnel link) ---------- */
.nextstep{display:block;background:linear-gradient(120deg,var(--teal-dark),var(--teal));color:#fff;border-radius:16px;padding:24px 26px;margin:34px 0;box-shadow:var(--shadow)}
.nextstep:hover{text-decoration:none;color:#fff;transform:translateY(-2px)}
.nextstep small{display:block;text-transform:uppercase;letter-spacing:.12em;font-size:.72rem;opacity:.85;margin-bottom:6px}
.nextstep b{font-family:var(--serif);font-size:1.3rem;display:block}
.nextstep span{opacity:.9;font-size:.95rem}

/* ---------- Disclosure / footer ---------- */
.disclosure{background:var(--bg-soft);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin:26px 0;font-size:.86rem;color:var(--muted)}
.site-footer{background:#132029;color:#c3ced6;padding:44px 0 30px;margin-top:40px}
.site-footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:30px}
.site-footer h4{color:#fff;font-family:var(--serif);margin:0 0 12px;font-size:1.05rem}
.site-footer a{color:#c3ced6}
.site-footer a:hover{color:#fff}
.site-footer ul{list-style:none;padding:0;margin:0}
.site-footer li{margin:7px 0}
.foot-brand{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.foot-brand img{width:40px;height:40px;border-radius:10px}
.foot-brand b{color:#fff;font-family:var(--serif);font-size:1.1rem}
.foot-legal{border-top:1px solid #26343d;margin-top:28px;padding-top:18px;font-size:.82rem;color:#8497a3;line-height:1.6}
.foot-legal a{color:#a9b8c2;text-decoration:underline}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:26px}
  .hero-art{order:-1}
  .cards{grid-template-columns:1fr 1fr}
  .pricing{grid-template-columns:1fr}
  .trust{grid-template-columns:1fr 1fr}
  .site-footer .wrap{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  body{font-size:17px}
  .nav{flex-wrap:wrap;gap:10px}
  .nav-links{gap:14px;width:100%;margin-left:0}
  .cards,.proscons,.stats,.quotes{grid-template-columns:1fr}
  .trust{grid-template-columns:1fr 1fr}
  .guarantee{flex-direction:column;text-align:center}
  .site-footer .wrap{grid-template-columns:1fr}
  .section{padding:38px 0}
}