/* ═══════════════════════════════════════════════════════════════
   nasalcarehub.com — Authority Design System (Phase 3 HCP-support)
   Editorial / knowledge-hub theme. Same identity as Phase 1/2:
   serif display (Noto Serif Thai), calm clinical palette (teal/sky/ink),
   "breath line" signature, NO money chrome (no Shopee/price/bundle/buy).
   ═══════════════════════════════════════════════════════════════ */
:root{
  --paper:#FBFCFC; --mist:#F1F7F6; --mist2:#E8F4F0; --cream:#FAF6F0;
  --teal:#2BB6A3; --teal-dark:#1E8E7F; --teal-light:#D6F0EB;
  --sky:#4F86B5; --sky-dark:#3A6A93; --sky-light:#E8F1F8;
  --ink:#15303A; --ink-soft:#274551;
  --amber:#D9920C; --amber-bg:#FDF6E8; --amber-bd:#F0DCA6;
  --rose-bg:#FDECEA; --rose-bd:#F0B8B0; --rose:#B6402F;
  --text:#1E2D34; --text-2:#46585F; --muted:#73848B; --invert:#fff;
  --bd:#E3E9E9; --bd-mid:#CBD6D6;
  --sh-sm:0 1px 3px rgba(21,48,58,.06); --sh-md:0 6px 18px rgba(21,48,58,.08);
  --sh-lg:0 16px 40px rgba(21,48,58,.12);
  --r-sm:8px; --r-md:14px; --r-lg:20px; --r-xl:28px;
  --col:1080px; --read:720px; --ease:cubic-bezier(.22,.61,.36,1);
  --serif:"Leelawadee UI",Tahoma,Arial,sans-serif; --sans:"Leelawadee UI",Tahoma,Arial,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:var(--sans);color:var(--text);background:var(--paper);
  line-height:1.78;font-size:16px;overflow-wrap:break-word;hyphens:none;overflow-x:hidden}
.wrap{max-width:var(--col);margin:0 auto;padding:0 20px}
.read{max-width:var(--read);margin-left:auto;margin-right:auto}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.img-slot{position:relative;width:100%;background:linear-gradient(135deg,var(--mist2),var(--teal-light));border-radius:var(--r-md);overflow:hidden}
.img-slot.ratio-wide{aspect-ratio:16/9}
.img-slot.ratio-sq{aspect-ratio:1/1}
.img-slot img{width:100%;height:100%;object-fit:cover}
.img-cap{font-size:.8rem;color:var(--muted);margin-top:8px;text-align:center}

/* ── breath-line signature ── */
.breath{height:14px;width:120px;margin:0 0 14px;display:block}
.breath path{fill:none;stroke:var(--teal);stroke-width:2;stroke-linecap:round}
.center .breath{margin-left:auto;margin-right:auto}

/* ── nav (authority — knowledge links, no buy cta) ── */
.nav{position:sticky;top:0;z-index:100;background:rgba(251,252,252,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--bd)}
.nav-inner{max-width:var(--col);margin:0 auto;padding:11px 20px;display:flex;align-items:center;justify-content:space-between;gap:12px}
.brand{display:flex;align-items:center;gap:10px;font-family:var(--serif);font-weight:700;color:var(--ink);font-size:1.08rem}
.brand-dot{width:32px;height:32px;border-radius:10px;background:linear-gradient(135deg,var(--teal),var(--teal-dark));display:flex;align-items:center;justify-content:center;color:#fff;font-size:.74rem;font-weight:800;font-family:var(--sans)}
.brand small{display:block;font-family:var(--sans);font-weight:500;font-size:.66rem;color:var(--muted);letter-spacing:.02em;margin-top:1px}
.nav-links{display:none;gap:22px;align-items:center}
.nav-links a{color:var(--text-2);font-weight:500;font-size:.92rem;transition:color .2s}
.nav-links a:hover,.nav-links a.active{color:var(--teal-dark)}
.burger{display:flex;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.burger span{width:24px;height:2.5px;background:var(--ink);border-radius:2px;transition:.3s}
.drawer{position:fixed;inset:0;z-index:200;background:rgba(15,30,50,.5);opacity:0;pointer-events:none;transition:opacity .3s}
.drawer.open{opacity:1;pointer-events:auto}
.drawer-panel{position:absolute;top:0;right:0;width:min(82%,320px);height:100%;background:#fff;padding:24px 22px;transform:translateX(100%);transition:transform .3s var(--ease);display:flex;flex-direction:column;gap:4px;overflow-y:auto}
.drawer.open .drawer-panel{transform:translateX(0)}
.drawer-panel .d-head{font-family:var(--serif);font-weight:700;color:var(--ink);font-size:1rem;margin-bottom:6px}
.drawer-panel a{padding:12px 8px;border-bottom:1px solid var(--bd);font-weight:600;color:var(--ink-soft);font-size:.95rem}
.drawer-close{align-self:flex-end;background:none;border:0;font-size:1.6rem;cursor:pointer;color:var(--muted);line-height:1}

/* ── breadcrumb ── */
.crumb{background:var(--mist);font-size:.82rem;color:var(--muted);padding:9px 0}
.crumb .wrap{display:flex;flex-wrap:wrap;gap:6px;align-items:center}
.crumb a:hover{color:var(--teal-dark)}
.crumb .sep{color:var(--bd-mid)}

/* ── hero (editorial, mini-TOC instead of buy cta) ── */
.hero{background:linear-gradient(165deg,var(--mist),var(--mist2))}
.hero .wrap{display:grid;gap:26px;padding-top:42px;padding-bottom:46px;align-items:center}
.hero-eyebrow{display:inline-flex;align-items:center;gap:7px;background:#fff;color:var(--teal-dark);font-weight:700;font-size:.78rem;padding:6px 14px;border-radius:999px;margin-bottom:16px;border:1px solid var(--teal-light)}
.hero-eyebrow .tag{background:var(--sky-light);color:var(--sky-dark);font-size:.68rem;padding:2px 8px;border-radius:999px;font-weight:700}
.hero h1{font-family:var(--serif);font-size:1.85rem;font-weight:700;line-height:1.34;letter-spacing:-.005em;color:var(--ink);margin-bottom:15px}
.hero h1 .accent{color:var(--teal-dark)}
.hero-sub{font-size:1.05rem;color:var(--text-2);margin-bottom:22px}
.toc{background:#fff;border:1px solid var(--bd);border-radius:var(--r-lg);padding:20px 22px;box-shadow:var(--sh-sm)}
.toc h2{font-family:var(--sans);font-size:.78rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);margin-bottom:12px;font-weight:700}
.toc ol{list-style:none;counter-reset:t;display:grid;gap:2px}
.toc li{counter-increment:t}
.toc a{display:flex;gap:11px;align-items:baseline;padding:8px 6px;border-radius:var(--r-sm);font-size:.95rem;color:var(--ink-soft);font-weight:500;transition:background .2s}
.toc a:hover{background:var(--mist)}
.toc a::before{content:counter(t,decimal-leading-zero);font-family:var(--serif);color:var(--teal);font-weight:700;font-size:.82rem;min-width:22px}

/* ── audience strip ── */
.aud{background:var(--ink);color:#cfe0e2}
.aud .wrap{display:flex;flex-wrap:wrap;gap:10px 26px;padding:15px 20px;justify-content:center;font-size:.85rem;font-weight:500}
.aud span{display:inline-flex;align-items:center;gap:8px}
.aud b{color:#fff}
.aud .dot{width:6px;height:6px;border-radius:50%;background:var(--teal);display:inline-block}

/* ── sections ── */
section{padding:50px 0}
.sec-mist{background:var(--mist)}
.sec-mist2{background:var(--mist2)}
.sec-cream{background:var(--cream)}
.eyebrow{color:var(--teal-dark);font-weight:700;font-size:.8rem;letter-spacing:.05em;text-transform:uppercase;margin-bottom:10px;display:flex;align-items:center;gap:9px}
.eyebrow .step{font-family:var(--serif);background:var(--teal-light);color:var(--teal-dark);width:26px;height:26px;border-radius:8px;display:inline-flex;align-items:center;justify-content:center;font-size:.82rem}
h2{font-family:var(--serif);font-size:1.52rem;font-weight:700;line-height:1.36;color:var(--ink);margin-bottom:14px;letter-spacing:-.005em}
h3{font-size:1.08rem;font-weight:700;color:var(--ink);margin-bottom:8px}
.lead{font-size:1.05rem;color:var(--text-2);max-width:var(--read);margin-bottom:10px}
p{margin-bottom:14px;color:var(--text-2)}
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}
strong,b{color:var(--ink-soft)}

/* ── prose helpers ── */
.prose p{font-size:1.02rem}
.prose ul,.prose ol{margin:0 0 16px;padding-left:22px;color:var(--text-2)}
.prose li{margin-bottom:9px}
.prose li::marker{color:var(--teal)}
.key{background:linear-gradient(180deg,transparent 62%,var(--teal-light) 62%);padding:0 2px}

/* ── callouts ── */
.note{border-radius:var(--r-md);padding:18px 20px;margin:18px 0;font-size:.96rem;line-height:1.7}
.note h3{font-size:1rem;margin-bottom:6px}
.note.info{background:var(--sky-light);border:1px solid #cfe0f0;color:var(--ink-soft)}
.note.info h3{color:var(--sky-dark)}
.note.safe{background:var(--mist2);border:1px solid var(--teal-light);color:var(--ink-soft)}
.note.safe h3{color:var(--teal-dark)}
.note.warn{background:var(--amber-bg);border:1px solid var(--amber-bd);color:#6b5418}
.note.warn h3{color:var(--amber)}
.note.lock{background:var(--rose-bg);border:1px solid var(--rose-bd);color:#6e2a20}
.note.lock h3{color:var(--rose)}
.note p:last-child{margin-bottom:0}

/* ── definition / mechanism cards ── */
.mech{display:grid;gap:16px;margin-top:22px}
.mcard{background:#fff;border:1px solid var(--bd);border-radius:var(--r-md);padding:20px 22px;box-shadow:var(--sh-sm)}
.mcard .ic{width:40px;height:40px;border-radius:11px;background:var(--teal-light);color:var(--teal-dark);display:flex;align-items:center;justify-content:center;font-family:var(--serif);font-weight:700;margin-bottom:12px}
.mcard h3{font-size:1.02rem}
.mcard p{font-size:.94rem;margin-bottom:0}

/* ── compare table ── */
.compare{margin-top:22px;border:1px solid var(--bd);border-radius:var(--r-md);overflow:hidden;background:#fff}
.compare-head,.crow{display:grid;grid-template-columns:1fr;gap:0}
.compare-head{display:none}
.crow{border-bottom:1px solid var(--bd)}
.crow:last-child{border-bottom:0}
.crow .ch{background:var(--mist);font-weight:700;color:var(--ink);padding:12px 16px 4px;font-size:.86rem}
.crow .cc{padding:6px 16px 12px;font-size:.93rem;color:var(--text-2)}
.crow .cc.a{border-left:3px solid var(--teal)}
.crow .cc.b{border-left:3px solid var(--sky)}
.crow .cc b{display:block;font-size:.76rem;color:var(--muted);text-transform:uppercase;letter-spacing:.03em;margin-bottom:2px;font-weight:700}

/* ── FAQ (native details) ── */
.faq{display:grid;gap:10px;margin-top:22px;max-width:var(--read);margin-left:auto;margin-right:auto}
.faq details{background:#fff;border:1px solid var(--bd);border-radius:var(--r-md);overflow:hidden}
.faq summary{padding:16px 20px;font-weight:600;color:var(--ink);cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:14px;align-items:center;font-size:.98rem}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.4rem;color:var(--teal);transition:transform .2s;line-height:1}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq .ans{padding:0 20px 18px;color:var(--text-2);font-size:.95rem;line-height:1.72}

/* ── HCP bridge box ── */
.bridge{background:linear-gradient(160deg,var(--ink),var(--ink-soft));color:#dceaec;border-radius:var(--r-xl);padding:30px 26px;box-shadow:var(--sh-lg)}
.bridge .badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.1);color:#9fe6da;font-size:.74rem;font-weight:700;letter-spacing:.05em;text-transform:uppercase;padding:6px 13px;border-radius:999px;margin-bottom:14px}
.bridge h2{color:#fff;font-size:1.32rem;margin-bottom:12px}
.bridge p{color:#bcd2d5;font-size:.98rem;margin-bottom:18px}
.bridge .hcp-cta{display:inline-flex;align-items:center;gap:10px;background:var(--teal);color:#04201c;font-weight:700;font-size:1rem;padding:14px 24px;border-radius:999px;transition:transform .15s var(--ease),background .2s}
.bridge .hcp-cta:hover{background:#3fd0bb;transform:translateY(-1px)}
.bridge .hcp-cta:active{transform:scale(.98)}
.bridge .fine{display:block;margin-top:14px;font-size:.82rem;color:#8fabae;line-height:1.65}

/* ── next action ── */
.next{display:grid;gap:14px;margin-top:22px}
.ncard{background:#fff;border:1px solid var(--bd);border-radius:var(--r-md);padding:20px;box-shadow:var(--sh-sm);transition:transform .15s var(--ease),box-shadow .2s;display:flex;flex-direction:column}
.ncard:hover{transform:translateY(-2px);box-shadow:var(--sh-md)}
.ncard .k{font-size:.74rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--teal-dark);margin-bottom:8px}
.ncard h3{font-size:1.02rem;margin-bottom:6px}
.ncard p{font-size:.9rem;margin-bottom:12px}
.ncard .go{margin-top:auto;font-weight:700;color:var(--sky-dark);font-size:.92rem}
.ncard .go::after{content:" →"}

/* ── E-E-A-T ── */
.eeat{background:var(--cream);padding:34px 0}
.eeat .wrap{display:grid;gap:14px}
.eeat-box{background:#fff;border:1px solid var(--bd);border-radius:var(--r-md);padding:20px 22px}
.eeat-box h3{font-size:.98rem;margin-bottom:10px}
.eeat-meta{display:flex;flex-wrap:wrap;gap:6px 22px;font-size:.86rem;color:var(--muted);margin-bottom:12px}
.eeat-meta b{color:var(--text-2)}
.eeat-box p{font-size:.86rem;margin:0 0 8px;color:var(--muted);line-height:1.7}
.eeat-box .src{font-size:.82rem;color:var(--muted)}
.eeat-box .src b{color:var(--text-2)}

/* ── byline ── */
.byline{display:flex;flex-wrap:wrap;gap:6px 16px;font-size:.84rem;color:var(--muted);margin-bottom:6px}
.byline b{color:var(--text-2)}

/* ── footer (no Shopee) ── */
footer{background:var(--ink);color:#aec3c7;padding:40px 0 44px}
.foot-grid{display:grid;gap:24px}
.foot-brand b{color:#fff;font-family:var(--serif);font-size:1.15rem}
.foot-brand p{color:#8aa4a9;font-size:.88rem;margin-top:8px}
.foot-col h4{color:#fff;font-size:.92rem;margin-bottom:12px}
.foot-col a{display:block;color:#aec3c7;font-size:.9rem;padding:5px 0;transition:color .2s}
.foot-col a:hover{color:#5fe0cd}
.foot-bottom{border-top:1px solid rgba(255,255,255,.12);margin-top:26px;padding-top:18px;font-size:.8rem;color:#7e979c;line-height:1.7}

/* ── motion / a11y ── */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}
:focus-visible{outline:3px solid var(--sky);outline-offset:2px;border-radius:4px}

@media(min-width:768px){
  .hero h1{font-size:2.5rem}
  .hero .wrap{grid-template-columns:1.1fr .9fr}
  h2{font-size:1.9rem}
  .mech{grid-template-columns:repeat(2,1fr)}
  .compare-head{display:grid;grid-template-columns:1.05fr 1.3fr 1.3fr;gap:0;background:var(--mist);font-size:.74rem;font-weight:700;color:var(--muted);text-transform:uppercase;letter-spacing:.03em}
  .compare-head div{padding:13px 16px}
  .crow{grid-template-columns:1.05fr 1.3fr 1.3fr;align-items:stretch}
  .crow .ch{background:#fff;border-right:1px solid var(--bd);padding:16px;font-size:.92rem;display:flex;align-items:center}
  .crow .cc{padding:16px;display:flex;flex-direction:column;justify-content:center}
  .crow .cc b{display:none}
  .crow .cc.a{border-left:0;background:var(--mist2)}
  .crow .cc.b{border-left:0;border-left:1px solid var(--bd);background:var(--sky-light)}
  .next{grid-template-columns:repeat(3,1fr)}
  .foot-grid{grid-template-columns:1.5fr 1fr 1fr}
  .eeat .wrap{max-width:var(--read)}
}
@media(min-width:920px){
  .nav-links{display:flex}
  .burger{display:none}
}