/* ==========================================================================
   Aquasign website rebuild — brand design system
   Brand: yellow #F0E52D (CTAs, accents), ocean blue, Montserrat headings +
   Poppins body, yellow marker logo, squared CTAs. Prototype by North Star.
   ========================================================================== */
:root{
  --yellow:#F0E52D; --yellow-dark:#d9cf1e; --yellow-ink:#0b1b2b;
  --blue:#0e4f8b; --blue-bright:#1f6fc4; --blue-deep:#0a2c52; --navy:#071d33;
  --ink:#15202b; --body:#3c4652; --muted:#6c7681;
  --bg:#ffffff; --soft:#f3f6fa; --soft2:#e9eff5; --line:#e2e8ef;
  --ok:#1a9d54;
  --wrap:1200px; --narrow:820px;
  --r:10px; --r-sm:6px;
  --sh:0 18px 44px -26px rgba(7,29,51,.32);
  --sh-sm:0 6px 20px -12px rgba(7,29,51,.28);
  --ease:cubic-bezier(.22,.61,.36,1);
  --hd:'Montserrat',system-ui,sans-serif;
  --bd:'Poppins',system-ui,sans-serif;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:var(--bd);color:var(--body);background:var(--bg);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased}
h1,h2,h3,h4{font-family:var(--hd);color:var(--ink);line-height:1.12;margin:0 0 .5em;font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(2.1rem,4.4vw,3.5rem)}
h2{font-size:clamp(1.6rem,3vw,2.4rem)}
h3{font-size:1.28rem}
h4{font-size:1.02rem}
p{margin:0 0 1rem}
a{color:var(--blue);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block}
strong{color:var(--ink)}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 clamp(1.1rem,4vw,2rem)}
.narrow{max-width:var(--narrow);margin:0 auto}
.eyebrow{font-family:var(--hd);font-weight:800;text-transform:uppercase;letter-spacing:.14em;font-size:.72rem;color:var(--blue)}
.center{text-align:center}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0)}

/* ---- buttons (brand: squared yellow, black text) ---- */
.btn{display:inline-flex;align-items:center;gap:.5rem;font-family:var(--hd);font-weight:700;font-size:.86rem;
  letter-spacing:.06em;text-transform:uppercase;padding:.85rem 1.5rem;border-radius:0;border:2px solid var(--yellow);
  background:var(--yellow);color:var(--yellow-ink);cursor:pointer;transition:.18s var(--ease);text-decoration:none;line-height:1}
.btn:hover{background:var(--yellow-dark);border-color:var(--yellow-dark);text-decoration:none;transform:translateY(-1px)}
.btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.55)}
.btn--ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}
.btn--dark{background:var(--navy);border-color:var(--navy);color:#fff}
.btn--dark:hover{background:var(--blue-deep);border-color:var(--blue-deep)}
.btn--sm{padding:.6rem 1rem;font-size:.78rem}

/* ---- header ---- */
.site-head{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.94);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.site-head__in{display:flex;align-items:center;gap:1.2rem;height:74px}
.brand{display:flex;align-items:center;gap:.6rem;margin-right:auto}
.brand img{height:46px;width:auto}
.nav{display:flex;align-items:center;gap:.1rem}
.nav__link{font-family:var(--hd);font-weight:600;font-size:.85rem;color:var(--ink);padding:.5rem .65rem;border-radius:var(--r-sm);display:inline-flex;align-items:center;gap:.25rem;white-space:nowrap}
.nav__link:hover{background:var(--soft);text-decoration:none;color:var(--blue)}
.nav__link.active{color:var(--blue)}
.nav__item{position:relative}
.nav__caret{font-size:.58rem;opacity:.55}
.nav__sub{position:absolute;top:calc(100% - 2px);left:0;min-width:262px;background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);box-shadow:var(--sh);padding:.4rem;opacity:0;visibility:hidden;transform:translateY(6px);transition:.16s var(--ease);z-index:60}
.nav__item:hover .nav__sub,.nav__item:focus-within .nav__sub{opacity:1;visibility:visible;transform:translateY(0)}
.nav__sub a{display:block;font-family:var(--hd);font-weight:600;font-size:.84rem;color:var(--ink);padding:.55rem .7rem;border-radius:var(--r-sm);white-space:nowrap}
.nav__sub a:hover{background:var(--soft);color:var(--blue);text-decoration:none}
.nav__cta{margin-left:.5rem}
.navtoggle{display:none;background:none;border:0;cursor:pointer;padding:.4rem;margin-left:auto}
.navtoggle span{display:block;width:24px;height:2px;background:var(--ink);margin:5px 0;transition:.2s}
@media(max-width:1040px){
  .navtoggle{display:block}
  .nav{position:fixed;inset:74px 0 auto 0;flex-direction:column;align-items:stretch;background:#fff;border-bottom:1px solid var(--line);
    padding:.6rem 1rem 1.4rem;gap:.05rem;transform:translateY(-145%);transition:.28s var(--ease);box-shadow:var(--sh);max-height:calc(100vh - 74px);overflow:auto}
  body.nav-open .nav{transform:translateY(0)}
  .nav__link{padding:.7rem .6rem;font-size:1rem}
  .nav__item{position:static}
  .nav__caret{margin-left:auto;font-size:.7rem}
  .nav__sub{position:static;opacity:1;visibility:visible;transform:none;box-shadow:none;border:0;border-left:2px solid var(--line);border-radius:0;padding:.1rem 0 .5rem;min-width:0;margin:0 0 .3rem .8rem}
  .nav__sub a{font-size:.92rem;padding:.5rem .6rem}
  .nav__cta{margin:.6rem 0 0;justify-content:center}
}

/* ---- hero ---- */
.hero{position:relative;color:#fff;overflow:hidden;background:var(--blue-deep)}
.hero__bg{position:absolute;inset:0;object-fit:cover;width:100%;height:100%}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(105deg,rgba(7,29,51,.92) 0%,rgba(10,44,82,.78) 45%,rgba(10,44,82,.30) 100%)}
.hero__in{position:relative;z-index:2;padding:clamp(3.5rem,9vw,6.5rem) 0;max-width:760px}
.hero h1{color:#fff}
.hero__lede{font-size:clamp(1.05rem,2vw,1.28rem);color:#dce7f2;margin:1rem 0 1.8rem;max-width:44ch}
.hero__cta{display:flex;gap:.8rem;flex-wrap:wrap}
.hero--sm .hero__in{padding:clamp(2.6rem,6vw,4rem) 0;max-width:820px}
.hero--sm h1{font-size:clamp(1.8rem,3.6vw,2.7rem)}

/* breadcrumb */
.crumb{font-size:.82rem;color:#bcd0e6;margin-bottom:.9rem;font-family:var(--hd);font-weight:600}
.crumb a{color:#bcd0e6}.crumb a:hover{color:#fff}
.crumb span{opacity:.6;margin:0 .4rem}

/* ---- sections ---- */
section{padding:clamp(3rem,7vw,5.5rem) 0}
.sec-soft{background:var(--soft)}
.sec-navy{background:var(--navy);color:#cfe0f0}
.sec-navy h2,.sec-navy h3{color:#fff}
.sec-head{max-width:640px;margin:0 auto 2.4rem;text-align:center}
.sec-head p{color:var(--muted);font-size:1.05rem}
.sec-navy .sec-head p{color:#bcd0e6}

/* trust bar */
.trust{background:var(--navy);color:#fff;border-top:4px solid var(--yellow)}
.trust__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.5rem;padding:2.2rem 0}
.trust__item{text-align:center}
.trust__n{font-family:var(--hd);font-weight:800;font-size:2rem;color:var(--yellow);line-height:1}
.trust__l{font-size:.82rem;color:#bcd0e6;margin-top:.35rem;letter-spacing:.02em}
@media(max-width:720px){.trust__grid{grid-template-columns:repeat(2,1fr);gap:1.3rem}}

/* cards */
.grid{display:grid;gap:1.4rem}
.g-3{grid-template-columns:repeat(3,1fr)}
.g-2{grid-template-columns:repeat(2,1fr)}
.g-4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g-3,.g-4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.g-2,.g-3,.g-4{grid-template-columns:1fr}}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.2s var(--ease);display:flex;flex-direction:column}
.card:hover{box-shadow:var(--sh);transform:translateY(-3px)}
.card__img{aspect-ratio:3/2;object-fit:cover;width:100%;background:var(--soft2)}
.card__b{padding:1.15rem 1.25rem 1.35rem;display:flex;flex-direction:column;gap:.45rem;flex:1}
.card__tag{font-family:var(--hd);font-weight:800;text-transform:uppercase;letter-spacing:.1em;font-size:.66rem;color:var(--blue)}
.card__b h3{margin:0;font-size:1.12rem}
.card__b p{margin:0;color:var(--muted);font-size:.92rem;flex:1}
.card__more{font-family:var(--hd);font-weight:700;font-size:.82rem;color:var(--blue);margin-top:.3rem}
.card--link:hover{text-decoration:none}

/* feature row (icon + text) */
.feat{display:flex;gap:.9rem;align-items:flex-start}
.feat__ic{flex:0 0 44px;height:44px;border-radius:10px;background:var(--soft);display:flex;align-items:center;justify-content:center;color:var(--blue)}
.feat h3{font-size:1.05rem;margin:.1rem 0 .3rem}
.feat p{font-size:.92rem;color:var(--muted);margin:0}

/* split media */
.split{display:grid;grid-template-columns:1fr 1fr;gap:clamp(1.5rem,4vw,3.5rem);align-items:center}
.split img{border-radius:var(--r);box-shadow:var(--sh);width:100%}
.split--rev .split__media{order:2}
@media(max-width:820px){.split{grid-template-columns:1fr}.split--rev .split__media{order:0}}
.chips{display:flex;flex-wrap:wrap;gap:.5rem;margin:.4rem 0}
.chip{font-family:var(--hd);font-weight:600;font-size:.78rem;background:var(--soft);color:var(--ink);border:1px solid var(--line);padding:.35rem .7rem;border-radius:999px}

/* ---- content cluster map ---- */
.cluster-map{background:var(--navy);border-radius:var(--r);padding:clamp(1.5rem,4vw,2.6rem);color:#fff;overflow:hidden}
.cluster-map__pillar{display:block;background:linear-gradient(120deg,var(--blue),var(--blue-bright));border-radius:var(--r);padding:1.3rem 1.5rem;margin-bottom:1.4rem;color:#fff;border:1px solid rgba(255,255,255,.14)}
.cluster-map__pillar:hover{text-decoration:none;transform:translateY(-2px);transition:.2s}
.cluster-map__pillar .k{font-family:var(--hd);font-weight:800;text-transform:uppercase;letter-spacing:.1em;font-size:.66rem;color:var(--yellow)}
.cluster-map__pillar h3{color:#fff;margin:.25rem 0 .15rem}
.cluster-map__spokes{display:grid;grid-template-columns:repeat(5,1fr);gap:.8rem}
@media(max-width:900px){.cluster-map__spokes{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.cluster-map__spokes{grid-template-columns:1fr}}
.spoke{display:block;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:var(--r-sm);padding:.85rem .9rem;color:#dce7f2;transition:.18s}
.spoke:hover{background:rgba(255,255,255,.13);text-decoration:none;color:#fff;transform:translateY(-2px)}
.spoke .t{font-family:var(--hd);font-weight:800;text-transform:uppercase;letter-spacing:.08em;font-size:.6rem;color:var(--yellow)}
.spoke .h{display:block;font-weight:600;font-size:.9rem;margin-top:.2rem;color:#fff}

/* ---- article ---- */
.article{padding-top:2.6rem}
.article__body{max-width:var(--narrow);margin:0 auto}
.article__body h2{margin-top:2.2rem}
.article__body h3{margin-top:1.6rem;color:var(--blue-deep)}
.article__body ul,.article__body ol{padding-left:1.2rem;margin:0 0 1.1rem}
.article__body li{margin-bottom:.4rem}
.article__lead{font-size:1.2rem;color:var(--ink);line-height:1.5;font-weight:500;margin-bottom:1.4rem}
.byline{display:flex;align-items:center;gap:.7rem;margin:1.2rem 0 1.6rem;padding-bottom:1.4rem;border-bottom:1px solid var(--line)}
.byline__av{width:46px;height:46px;border-radius:50%;background:var(--blue-deep);color:#fff;display:flex;align-items:center;justify-content:center;font-family:var(--hd);font-weight:800}
.byline b{color:var(--ink);font-size:.92rem}.byline span{display:block;font-size:.8rem;color:var(--muted)}
.pull{border-left:4px solid var(--yellow);background:var(--soft);padding:1.1rem 1.3rem;margin:1.5rem 0;border-radius:0 var(--r-sm) var(--r-sm) 0}
.pull p{margin:0;font-size:1.1rem;color:var(--ink);font-weight:500}
figure{margin:1.6rem 0}
figure img{border-radius:var(--r);width:100%}
figcaption{font-size:.82rem;color:var(--muted);margin-top:.5rem;text-align:center}
.tbl{width:100%;border-collapse:collapse;margin:1.2rem 0;font-size:.95rem}
.tbl th,.tbl td{text-align:left;padding:.7rem .8rem;border-bottom:1px solid var(--line);vertical-align:top}
.tbl th{font-family:var(--hd);background:var(--soft);color:var(--ink)}
.callout{background:linear-gradient(120deg,var(--blue-deep),var(--blue));color:#fff;border-radius:var(--r);padding:1.6rem 1.8rem;margin:2rem 0}
.callout h3{color:#fff;margin-top:0}.callout p{color:#dce7f2;margin-bottom:1rem}

/* FAQ accordion */
.faq details{border:1px solid var(--line);border-radius:var(--r-sm);margin-bottom:.7rem;background:#fff;overflow:hidden}
.faq summary{font-family:var(--hd);font-weight:700;color:var(--ink);padding:1rem 1.1rem;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:1rem;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";color:var(--blue);font-size:1.3rem;font-weight:700;transition:.2s}
.faq details[open] summary::after{transform:rotate(45deg)}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq__a{padding:1rem 1.1rem;color:var(--body);font-size:.95rem}
.faq__a p:last-child{margin-bottom:0}

/* related / next */
.related{border-top:1px solid var(--line);margin-top:2.6rem;padding-top:1.8rem}

/* use-case / insight / project helpers */
.applies{display:inline-flex;align-items:center;gap:.5rem;background:var(--soft);border:1px solid var(--line);border-radius:999px;padding:.42rem .95rem;font-family:var(--hd);font-weight:600;font-size:.82rem;color:var(--ink);margin:0 0 1.2rem}
.applies b{color:var(--muted);font-weight:600}
.applies a{color:var(--blue)}
.illustrative{background:var(--yellow);color:var(--yellow-ink);border-radius:var(--r-sm);padding:.75rem 1.05rem;font-family:var(--hd);font-weight:700;font-size:.82rem;display:flex;gap:.55rem;align-items:center;margin:0 0 1.4rem;line-height:1.35}
.uc-cards .card__img{aspect-ratio:16/10}
.meta-row{display:flex;flex-wrap:wrap;gap:.5rem;margin:.2rem 0 0}
.meta-row .chip{background:var(--soft)}

/* ---- footer ---- */
.site-foot{background:var(--navy);color:#a9bcd0;padding:3.2rem 0 1.6rem;font-size:.9rem}
.foot__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem}
@media(max-width:820px){.foot__grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.foot__grid{grid-template-columns:1fr}}
.foot__grid h4{color:#fff;font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:.9rem}
.foot__grid a{color:#a9bcd0;display:block;padding:.22rem 0}
.foot__grid a:hover{color:var(--yellow);text-decoration:none}
.foot__brand img{height:44px;margin-bottom:.8rem}
.foot__brand p{max-width:34ch;color:#8aa0b6;font-size:.86rem}
.foot__bar{border-top:1px solid rgba(255,255,255,.1);margin-top:2.4rem;padding-top:1.2rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;font-size:.8rem;color:#7d92a8}
.proto-note{background:var(--yellow);color:var(--yellow-ink);text-align:center;font-family:var(--hd);font-weight:600;font-size:.8rem;padding:.5rem 1rem;letter-spacing:.02em}