/* ============================================================
   EternPharm — brand design system
   Navy #16374C · Deep #0C2233 · Crimson #A82444 · Mist #EAF1F5
   Display: Fraunces · Body: Archivo
   ============================================================ */

:root{
  --navy:#16374C;
  --navy-deep:#0C2233;
  --crimson:#A82444;
  --crimson-dark:#8C1C38;
  --mist:#EAF1F5;
  --paper:#FBFCFD;
  --ink:#22313C;
  --ink-soft:#5A6B77;
  --line:#D8E2E9;
  --display:'Fraunces', Georgia, serif;
  --body:'Archivo', 'Helvetica Neue', Arial, sans-serif;
  --wrap:1180px;
  --radius:14px;
  --shadow:0 18px 45px rgba(12,34,51,.12);
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--body);color:var(--ink);background:var(--paper);line-height:1.65;font-size:16.5px;-webkit-font-smoothing:antialiased}
img,video{max-width:100%;display:block}
a{color:var(--crimson);text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

h1,h2,h3{font-family:var(--display);color:var(--navy);line-height:1.12;font-weight:600;letter-spacing:-.01em}
h1{font-size:clamp(2.5rem,5.6vw,4.4rem)}
h2{font-size:clamp(1.9rem,3.6vw,2.8rem);margin-bottom:.6em}
h3{font-size:1.25rem;margin-bottom:.4em}
h2 em{font-style:normal;color:var(--crimson)}
.lead{font-size:1.12rem;color:var(--ink-soft);max-width:56ch}

.eyebrow{font-size:.78rem;font-weight:700;letter-spacing:.22em;text-transform:uppercase;color:var(--crimson);margin-bottom:1rem}
.eyebrow.light{color:#E8B4C2}
.fineprint{font-size:.78rem;color:var(--ink-soft);margin-top:1.2rem}
.fineprint.light{color:rgba(255,255,255,.55)}

/* ---------- buttons ---------- */
.btn{display:inline-block;font-family:var(--body);font-weight:600;font-size:.95rem;padding:.85rem 1.7rem;border-radius:999px;transition:transform .18s ease, box-shadow .18s ease, background .18s ease;cursor:pointer;border:2px solid transparent}
.btn:hover{transform:translateY(-2px)}
.btn:focus-visible{outline:3px solid var(--crimson);outline-offset:3px}
.btn-primary{background:var(--crimson);color:#fff;box-shadow:0 8px 22px rgba(168,36,68,.35)}
.btn-primary:hover{background:var(--crimson-dark)}
.btn-ghost{border-color:rgba(255,255,255,.7);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-outline{border-color:var(--navy);color:var(--navy)}
.btn-outline:hover{background:var(--navy);color:#fff}

/* ---------- top bar + header ---------- */
.topbar{background:var(--navy-deep);color:#C8D8E2;text-align:center;font-size:.82rem;padding:.5rem 16px;letter-spacing:.02em}
.topbar a{color:#fff;text-decoration:underline;text-underline-offset:3px}

.site-header{position:sticky;top:0;z-index:60;background:rgba(251,252,253,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.header-inner{display:flex;align-items:center;gap:2rem;height:76px}
.brand{display:flex;align-items:center;gap:.7rem}
.brand-mark{height:46px;width:auto}
.brand-name{font-family:var(--display);font-weight:700;font-size:1.45rem;color:var(--navy);letter-spacing:-.01em}
.brand-name span{color:var(--crimson)}
.site-nav{display:flex;gap:1.8rem;margin-left:auto}
.site-nav a{color:var(--ink);font-weight:500;font-size:.95rem;position:relative;padding:.3rem 0}
.site-nav a::after{content:"";position:absolute;left:0;right:100%;bottom:0;height:2px;background:var(--crimson);transition:right .2s ease}
.site-nav a:hover::after{right:0}
.header-cta{padding:.65rem 1.4rem}
.nav-toggle{display:none;background:none;border:0;width:42px;height:42px;flex-direction:column;justify-content:center;gap:6px;cursor:pointer}
.nav-toggle span{display:block;height:2px;background:var(--navy);border-radius:2px}

/* ---------- hero ---------- */
.hero{position:relative;min-height:82vh;display:flex;align-items:center;overflow:hidden;background:var(--navy-deep)}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}
.hero-scrim{position:absolute;inset:0;background:linear-gradient(100deg, rgba(9,26,39,.88) 0%, rgba(12,34,51,.62) 45%, rgba(12,34,51,.18) 100%)}
.hero-content{position:relative;z-index:2;padding-top:5rem;padding-bottom:5rem;max-width:760px}
.hero h1{color:#fff}
.hero-sub{color:rgba(255,255,255,.85);font-size:1.15rem;max-width:54ch;margin:1.4rem 0 2.2rem}
.hero-actions{display:flex;gap:1rem;flex-wrap:wrap}

/* ---------- trust strip ---------- */
.trust-strip{background:var(--navy);color:#fff;padding:1.4rem 0}
.trust-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1.2rem;text-align:center}
.trust-item strong{display:block;font-size:.92rem;letter-spacing:.04em}
.trust-item span{font-size:.78rem;color:#A9C0CF}

/* ---------- sections ---------- */
.section{padding:6rem 0}
.section-head{max-width:640px;margin-bottom:3.2rem}

/* ---------- product ---------- */
.product{background:var(--mist)}
.product-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:4rem;align-items:center}
.viewer-stage{background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);padding:2rem;display:flex;justify-content:center}
.viewer-stage img{max-height:480px;width:auto;transition:opacity .25s ease}
.viewer-thumbs{display:flex;gap:.8rem;margin-top:1rem;justify-content:center}
.thumb{width:76px;height:76px;border-radius:10px;border:2px solid var(--line);background:#fff;padding:8px;cursor:pointer;transition:border-color .15s ease}
.thumb img{height:100%;width:100%;object-fit:contain}
.thumb.is-active,.thumb:hover{border-color:var(--crimson)}
.feature-list{list-style:none;margin:1.6rem 0 2rem}
.feature-list li{padding:.55rem 0 .55rem 1.9rem;position:relative;border-bottom:1px solid var(--line)}
.feature-list li::before{content:"";position:absolute;left:0;top:1.05rem;width:9px;height:9px;border-radius:50%;background:var(--crimson)}
.feature-list li:last-child{border-bottom:0}

/* ---------- formula ---------- */
.formula-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.6rem;margin-bottom:3.5rem}
.formula-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:2.2rem 1.9rem;position:relative;transition:transform .2s ease, box-shadow .2s ease}
.formula-card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.formula-num{font-family:var(--display);font-size:2.6rem;font-weight:400;color:var(--line);position:absolute;top:1.1rem;right:1.4rem;line-height:1}
.dose{font-size:.85rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--crimson);margin-bottom:.7rem}
.formula-visual{display:grid;grid-template-columns:1fr 1fr;gap:1.6rem}
.formula-visual img{border-radius:var(--radius);border:1px solid var(--line)}

/* ---------- benefits ---------- */
.benefits{background:var(--navy-deep);color:#DCE8F0}
.benefits h2{color:#fff}
.benefits-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:4rem;align-items:center}
.check-list{list-style:none;margin:1.8rem 0 .6rem}
.check-list li{font-family:var(--display);font-size:1.25rem;color:#fff;padding:.65rem 0 .65rem 2.3rem;position:relative;border-bottom:1px solid rgba(255,255,255,.12)}
.check-list li:last-child{border-bottom:0}
.check-list li::before{content:"✓";position:absolute;left:0;top:.62rem;width:1.5rem;height:1.5rem;border-radius:50%;background:var(--crimson);color:#fff;font-size:.85rem;display:flex;align-items:center;justify-content:center;font-family:var(--body);font-weight:700}
.benefits-media img{border-radius:var(--radius);box-shadow:0 24px 60px rgba(0,0,0,.4)}

/* ---------- quality ---------- */
.quality-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:4rem;align-items:start}
.cert-details{margin:2rem 0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.cert-details > div{display:grid;grid-template-columns:170px 1fr;gap:1rem;padding:.9rem 1.3rem;border-bottom:1px solid var(--line);background:#fff}
.cert-details > div:last-child{border-bottom:0}
.cert-details dt{font-weight:700;font-size:.82rem;letter-spacing:.06em;text-transform:uppercase;color:var(--navy)}
.cert-details dd{font-size:.95rem;color:var(--ink-soft)}
.quality-points{display:grid;gap:1.2rem}
.q-point{background:var(--mist);border-radius:var(--radius);padding:1.6rem 1.8rem}
.q-point p{color:var(--ink-soft);font-size:.95rem}

/* ---------- about ---------- */
.about{background:var(--mist)}
.about-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:4rem}
.about-copy p{margin-bottom:1.1rem;max-width:58ch}
.roadmap{background:#fff;border-radius:var(--radius);padding:2.4rem;box-shadow:var(--shadow)}
.timeline{list-style:none;margin-top:1.4rem}
.timeline li{display:grid;grid-template-columns:70px 1fr;gap:1.2rem;padding:1rem 0;border-bottom:1px solid var(--line)}
.timeline li:last-child{border-bottom:0}
.tl-date{font-family:var(--display);font-weight:700;color:var(--crimson);font-size:1.1rem}
.tl-text{color:var(--ink-soft);font-size:.95rem}

/* ---------- social ---------- */
.social-grid{display:grid;grid-template-columns:380px 1fr;gap:4.5rem;align-items:center}
.phone-frame{background:var(--navy-deep);border-radius:36px;padding:14px;box-shadow:var(--shadow);max-width:340px;margin:0 auto}
.phone-frame video{border-radius:26px;width:100%}
.social-copy p{max-width:52ch;color:var(--ink-soft);margin-bottom:1.8rem}

/* ---------- faq ---------- */
.faq{background:var(--paper)}
.faq-wrap{max-width:820px}
.faq-list{display:grid;gap:.9rem}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;transition:box-shadow .2s ease}
.faq-item[open]{box-shadow:var(--shadow);border-color:var(--navy)}
.faq-item summary{list-style:none;cursor:pointer;padding:1.15rem 3.2rem 1.15rem 1.5rem;font-family:var(--display);font-weight:600;font-size:1.08rem;color:var(--navy);position:relative;user-select:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:1.4rem;top:50%;transform:translateY(-50%);font-family:var(--body);font-weight:400;font-size:1.5rem;color:var(--crimson);transition:transform .2s ease}
.faq-item[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq-item summary:focus-visible{outline:3px solid var(--crimson);outline-offset:-3px;border-radius:var(--radius)}
.faq-body{padding:0 1.5rem 1.3rem;color:var(--ink-soft);font-size:.98rem}
.faq-body a{text-decoration:underline;text-underline-offset:3px}
@media (prefers-reduced-motion: reduce){.faq-item,.faq-item summary::after{transition:none}}

/* ---------- footer ---------- */
.site-footer{background:var(--navy-deep);color:#B9CBD7;padding:4.5rem 0 2.5rem}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:2.5rem;padding-bottom:3rem;border-bottom:1px solid rgba(255,255,255,.12)}
.footer-wordmark{font-family:var(--display);font-weight:700;font-size:1.7rem;color:#fff}
.footer-wordmark span{color:#E8B4C2}
.footer-tag{font-size:.85rem;margin:.4rem 0 1.4rem;color:#8FA9BA}
.footer-addr{font-size:.9rem;line-height:1.7}
.footer-links h4{color:#fff;font-size:.82rem;letter-spacing:.14em;text-transform:uppercase;margin-bottom:1rem}
.footer-links a{display:block;color:#B9CBD7;font-size:.95rem;padding:.28rem 0;transition:color .15s ease}
.footer-links a:hover{color:#fff}
.footer-legal{padding-top:2rem;font-size:.78rem;color:#7A94A6;display:grid;gap:.9rem}

/* ---------- reveal animation ---------- */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease, transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .btn,.formula-card{transition:none}
}

/* ---------- responsive ---------- */
@media (max-width: 1000px){
  .product-grid,.benefits-grid,.quality-grid,.about-grid{grid-template-columns:1fr;gap:2.6rem}
  .social-grid{grid-template-columns:1fr;gap:2.6rem}
  .formula-grid{grid-template-columns:1fr}
  .formula-visual{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:repeat(2,1fr);row-gap:1.4rem}
  .section{padding:4rem 0}
}
@media (max-width: 760px){
  .site-nav{display:none;position:absolute;top:76px;left:0;right:0;background:#fff;flex-direction:column;gap:0;border-bottom:1px solid var(--line);padding:.6rem 0}
  .site-nav.open{display:flex}
  .site-nav a{padding:.9rem 24px}
  .header-cta{display:none}
  .nav-toggle{display:flex;margin-left:auto}
  .hero{min-height:70vh}
  .cert-details > div{grid-template-columns:1fr;gap:.15rem}
  .footer-grid{grid-template-columns:1fr 1fr}
}
@media (max-width: 480px){
  .footer-grid{grid-template-columns:1fr}
}