/* ============================================================
   EFFLUX PHARMA — design layer
   Built on the IBM Plex / Poul Schmith type & geometry system,
   recoloured for a clean, bright, modern clinical-biotech feel.
   Square corners, editorial uppercase headlines, mono labels.
   ============================================================ */

:root {
  /* ---- Type ---- */
  --font-sans:  "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --font-serif: "IBM Plex Serif", Georgia, "Times New Roman", serif;
  --font-mono:  "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --tr-display: 0.01em;
  --tr-eyebrow: 0.18em;
  --tr-mono:    0.14em;

  /* ---- Ink & surface (bright/clean) ---- */
  --ink:        #14313C;   /* deep petrol-navy — headlines & body */
  --ink-2:      #3F5b64;   /* secondary text */
  --ink-3:      #6E868D;   /* tertiary / captions */
  --paper:      #FFFFFF;
  --mist:       #F2F6F6;   /* cool off-white section */
  --mist-2:     #E9F0F0;
  --line:       #E0E8E8;
  --line-strong:#CBD8D8;

  /* ---- Teal accent ramp (lead brand colour) ---- */
  --teal-1:     #0F4A52;   /* deepest */
  --teal-2:     #1C6A72;
  --teal-3:     #2E8C92;
  --teal-4:     #57AAAE;
  --teal-5:     #9CCBCD;
  --teal-6:     #CDE6E6;
  --teal-7:     #E5F1F1;

  /* ---- Warm spark (used VERY sparingly: lead asset + primary CTA) ---- */
  --spark:      #D7724E;
  --spark-deep: #B65733;

  /* ---- Extrusion shades for 3D bars ---- */
  --ext-teal:   #0C3940;   /* dark side-face of teal chevrons */
  --ext-sand:   #9a8a6f;

  --radius-0: 0;
  --maxw: 1240px;
  --gutter: 48px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { color: var(--ink); background: var(--paper); -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
body { font: 300 17px/1.6 var(--font-sans); letter-spacing: 0.004em; }

h1,h2,h3,h4 { margin: 0; }
h1 { font: 700 clamp(40px, 5.4vw, 74px)/1.02 var(--font-sans); text-transform: uppercase; letter-spacing: var(--tr-display); }
h2 { font: 700 clamp(28px, 3.4vw, 44px)/1.06 var(--font-sans); text-transform: uppercase; letter-spacing: var(--tr-display); }
h3 { font: 600 22px/1.2 var(--font-sans); text-transform: uppercase; letter-spacing: 0.02em; }
h4 { font: 600 15px/1.3 var(--font-sans); text-transform: uppercase; letter-spacing: 0.05em; }

p { margin: 0 0 1.1em; }
a { color: inherit; }

.eyebrow {
  display: inline-block;
  font: 500 12px/1 var(--font-mono);
  text-transform: uppercase; letter-spacing: var(--tr-eyebrow);
  color: var(--teal-2);
}
.mono { font: 500 11px/1.3 var(--font-mono); text-transform: uppercase; letter-spacing: var(--tr-mono); }
.serif { font-family: var(--font-serif); }
.lead { font: 300 clamp(19px,2vw,23px)/1.55 var(--font-sans); color: var(--ink-2); }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.bar { display: block; height: 2px; background: var(--ink); width: 56px; }

/* ---------------- Top nav ---------------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px var(--gutter);
  background: rgba(255,255,255,0.86);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: inline-flex; align-items: baseline; gap: 10px; text-decoration: none; color: var(--ink); }
.brand__mark { font: 500 25px/1 var(--font-serif); letter-spacing: 0.01em; }
.brand__mark b { font-weight: 600; }
.brand__sub { font: 500 11px/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.28em; color: var(--teal-3); }
.nav__links { display: flex; align-items: center; gap: 30px; }
.nav__link {
  font: 500 12px/1 var(--font-sans); text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--ink); text-decoration: none; padding: 6px 0;
  border-bottom: 1.5px solid transparent; transition: color .12s, border-color .12s;
}
.nav__link:hover, .nav__link.is-active { color: var(--teal-2); border-bottom-color: var(--teal-3); }
.nav__cta {
  font: 500 11px/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em;
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 18px; background: var(--ink); color: #fff; text-decoration: none;
  transition: background .14s;
}
.nav__cta:hover { background: var(--teal-1); }

/* ---------------- Buttons ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 12px;
  height: 50px; padding: 0 26px; border: 0; cursor: pointer;
  font: 500 12px/1 var(--font-sans); text-transform: uppercase; letter-spacing: 0.12em;
  text-decoration: none; transition: background .14s, color .14s, border-color .14s;
}
.btn--primary { background: var(--spark); color: #fff; }
.btn--primary:hover { background: var(--spark-deep); }
.btn--dark { background: var(--ink); color: #fff; }
.btn--dark:hover { background: var(--teal-1); }
.btn--ghost { background: transparent; color: var(--ink); border: 1px solid var(--line-strong); }
.btn--ghost:hover { border-color: var(--ink); background: var(--ink); color: #fff; }
.btn--on-dark { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.45); }
.btn--on-dark:hover { background: #fff; color: var(--ink); }

.arrow { display: inline-block; width: 20px; height: 1px; background: currentColor; position: relative; }
.arrow::after {
  content: ""; position: absolute; right: 0; top: -4px; width: 8px; height: 8px;
  border-top: 1px solid currentColor; border-right: 1px solid currentColor; transform: rotate(45deg);
}
.textlink {
  font: 500 11px/1 var(--font-mono); text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: 12px;
  padding-bottom: 4px; border-bottom: 1px solid var(--line-strong); transition: color .14s, border-color .14s;
}
.textlink:hover { color: var(--teal-2); border-bottom-color: var(--teal-3); }

/* ---------------- Section scaffolding ---------------- */
.section { padding: 104px 0; }
.section--mist { background: var(--mist); }
.section--ink { background: var(--ink); color: #fff; }
.section--ink .eyebrow { color: var(--teal-5); }
.section-head { display: grid; gap: 18px; max-width: 760px; margin-bottom: 56px; }
.section-head--center { margin-left: auto; margin-right: auto; text-align: center; justify-items: center; }

/* ---------------- Page header band ---------------- */
.pagehead { padding: 84px 0 56px; border-bottom: 1px solid var(--line); }
.pagehead .eyebrow { margin-bottom: 20px; }
.pagehead h1 { max-width: 18ch; }
.pagehead p { margin-top: 24px; max-width: 60ch; }

/* ---------------- Footer ---------------- */
.foot { background: var(--ink); color: #fff; }
.foot__top { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; padding: 72px var(--gutter) 48px; max-width: var(--maxw); margin: 0 auto; }
.foot__brand .brand__mark { color: #fff; }
.foot__brand .brand__sub { color: var(--teal-5); }
.foot__tag { margin-top: 22px; max-width: 30ch; color: rgba(255,255,255,.7); font-size: 14px; line-height: 1.6; }
.foot h4 { color: var(--teal-5); margin-bottom: 16px; font-size: 11px; letter-spacing: 0.14em; font-family: var(--font-mono); font-weight: 500; }
.foot__col a { display: block; color: rgba(255,255,255,.82); text-decoration: none; font-size: 14px; padding: 5px 0; transition: color .12s; }
.foot__col a:hover { color: #fff; }
.foot__legal {
  border-top: 1px solid rgba(255,255,255,.12); max-width: var(--maxw); margin: 0 auto;
  padding: 22px var(--gutter); display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap;
  font: 500 11px/1.4 var(--font-mono); text-transform: uppercase; letter-spacing: 0.1em; color: rgba(255,255,255,.55);
}

/* ---------------- Generic cards ---------------- */
.card { background: var(--paper); border: 1px solid var(--line); padding: 34px; transition: border-color .14s, transform .18s; }
.cards { display: grid; gap: 22px; }

/* reveal-on-scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

@media (max-width: 900px) {
  :root { --gutter: 22px; }
  .nav__links { display: none; }
  .foot__top { grid-template-columns: 1fr 1fr; }
  .section { padding: 64px 0; }
}