/* =========================================================================
   IRA BIOTECH — Design Tokens
   "Biology Meets Precision" — editorial biotechnology system.
   Palette, type scale and spacing exactly as specified in the brand brief.
   ========================================================================= */

:root {
  /* ---- Brand color (exact spec) ---- */
  --green: #377846;
  --green-dark: #234E2E;
  --red: #ED3237;
  --charcoal: #102019;
  --off-white: #F7F8F4;
  --sage: #E8F0EA;
  --neutral: #F2F4F1;
  --white: #FFFFFF;

  /* ---- Semantic roles (70% neutral / 20% charcoal / 8% green / 2% red) ---- */
  --bg: var(--off-white);
  --bg-alt: var(--neutral);
  --bg-sage: var(--sage);
  --surface: var(--white);
  --ink: var(--charcoal);
  --ink-soft: #4E5C53;
  --ink-faint: #83917F;
  --line: #DDE3D9;
  --line-strong: var(--charcoal);
  --accent: var(--green);
  --accent-ink: var(--green-dark);
  --precision: var(--red);
  --on-dark: #EFF3EE;
  --on-dark-soft: #A9B6AB;

  /* ---- Type ---- */
  --font: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-serif: "Instrument Serif", Georgia, serif;

  /* Desktop scale (72-96 / 48-64 / 28-36 / 17-20) */
  --h1: clamp(2.75rem, 5.4vw, 6rem);
  --h2: clamp(2.1rem, 3.8vw, 3.7rem);
  --h3: clamp(1.4rem, 2vw, 2.1rem);
  --body: clamp(1.05rem, 1.1vw, 1.2rem);

  /* ---- Spacing ---- */
  --s-1: .25rem; --s-2: .5rem; --s-3: .75rem; --s-4: 1rem; --s-5: 1.25rem;
  --s-6: 1.5rem; --s-8: 2rem; --s-10: 2.5rem; --s-12: 3rem; --s-16: 4rem;
  --s-20: 5rem; --s-24: 6rem; --s-32: 8rem; --s-40: 10rem;

  /* ---- Layout ---- */
  --site-max: 1440px;
  --content-max: 1240px;
  --gutter: clamp(1.25rem, 4vw, 3rem);

  /* ---- Radii / borders (restrained — no heavy pill/card system) ---- */
  --radius-sm: 4px;
  --radius: 8px;

  /* ---- Motion ---- */
  --ease: cubic-bezier(.4,0,.2,1);
  --dur-fast: 220ms;
  --dur-med: 480ms;
  --dur-slow: 900ms;

  --focus-ring: var(--green);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  font-size: var(--body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
button { font-family: inherit; background: none; border: none; cursor: pointer; }
h1, h2, h3, h4 {
  font-family: var(--font);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
  color: var(--ink);
}
h1 { font-size: var(--h1); font-weight: 500; }
h2 { font-size: var(--h2); font-weight: 500; }
h3 { font-size: var(--h3); font-weight: 600; }
p { margin: 0; color: var(--ink-soft); }
em.serif { font-family: var(--font-serif); font-style: italic; font-weight: 400; color: inherit; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
:focus-visible { outline: 2px solid var(--focus-ring); outline-offset: 3px; }

/* ---- Layout primitives ---- */
.wrap { max-width: var(--content-max); margin-inline: auto; padding-inline: var(--gutter); }
.wrap-wide { max-width: var(--site-max); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: var(--s-20); }
.section-tight { padding-block: var(--s-16); }
@media (max-width: 860px) {
  .section { padding-block: var(--s-12); }
  .section-tight { padding-block: var(--s-10); }
}

.eyebrow {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-size: .78rem; font-weight: 700; letter-spacing: .14em; text-transform: uppercase;
  color: var(--accent-ink);
}
.eyebrow .mk { width: 6px; height: 6px; background: var(--precision); flex-shrink: 0; }

.label-num { font-family: var(--font); font-weight: 700; color: var(--precision); font-size: .95rem; letter-spacing: .04em; }

hr.rule { border: none; border-top: 1px solid var(--line); margin: 0; }

/* ---- Buttons / links (restrained — rectangular, no pill system) ---- */
.btn {
  display: inline-flex; align-items: center; gap: var(--s-3);
  padding: .95rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 700; font-size: .95rem;
  transition: background-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.btn-solid { background: var(--green); color: var(--white); }
.btn-solid:hover { background: var(--green-dark); }
.btn-outline { border: 1.5px solid var(--line-strong); color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: var(--white); border-color: var(--ink); }
.btn-inverse { background: var(--white); color: var(--charcoal); }
.btn-inverse:hover { background: var(--sage); }

.link-arrow {
  display: inline-flex; align-items: center; gap: var(--s-2);
  font-weight: 700; font-size: .95rem; color: var(--ink);
  padding-bottom: 2px;
  border-bottom: 1.5px solid var(--line-strong);
  transition: gap var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.link-arrow:hover { gap: var(--s-3); border-color: var(--accent); color: var(--accent-ink); }
.link-arrow svg { transition: transform var(--dur-fast) var(--ease); }
.link-arrow:hover svg { transform: translateX(2px); }

/* ---- Header ---- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  padding-block: var(--s-6);
  transition: background-color var(--dur-med) var(--ease), padding var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(247,248,244,.94);
  backdrop-filter: blur(8px);
  padding-block: var(--s-4);
  border-color: var(--line);
}
/* Any page whose top section is dark (video hero or image hero) gets this on
   <body> so the unscrolled header's nav text reads light against it; once
   scrolled, the header's own light background takes over and this is moot. */
body.has-video-hero .site-header:not(.is-scrolled) .brand,
body.has-video-hero .site-header:not(.is-scrolled) .nav-list > li > a,
body.has-video-hero .site-header:not(.is-scrolled) .nav-toggle,
body.has-dark-header .site-header:not(.is-scrolled) .brand,
body.has-dark-header .site-header:not(.is-scrolled) .nav-list > li > a,
body.has-dark-header .site-header:not(.is-scrolled) .nav-toggle { color: var(--on-dark); }
.header-row { display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: var(--s-3); font-weight: 700; font-size: 1.05rem; letter-spacing: -.01em; }
.brand img { height: 34px; width: 34px; }
.header-nav { display: flex; align-items: center; gap: var(--s-8); }
.nav-list { display: flex; align-items: center; gap: var(--s-8); font-size: .92rem; font-weight: 600; }
.nav-list > li { position: relative; }
.nav-list > li > a { display: inline-flex; align-items: center; padding-block: var(--s-2); line-height: 1.4; }
.nav-list > li > a[aria-current="page"] { color: var(--accent-ink); }
.nav-toggle { display: none; width: 40px; height: 40px; align-items: center; justify-content: center; color: var(--ink); }
@media (max-width: 980px) {
  .nav-list, .header-nav .btn { display: none; }
  .nav-toggle { display: inline-flex; }
}

/* ---- Products mega-menu (desktop) ----
   .mega-menu is the full hoverable hit-area: it starts flush at top:100% with
   no gap, so the cursor never leaves a hoverable box while moving from the
   trigger down into the panel. The visible border/shadow/background live on
   .mega-menu-inner, offset from the trigger by padding-top (not margin), so
   that offset space is still part of the hit-area instead of a dead zone. */
.mega-menu {
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%);
  padding-top: var(--s-5);
  width: 460px;
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity var(--dur-fast) var(--ease), visibility var(--dur-fast);
}
.nav-has-menu:hover .mega-menu,
.nav-has-menu:focus-within .mega-menu {
  opacity: 1; visibility: visible; pointer-events: auto;
}
.mega-menu-inner {
  background: var(--surface);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  padding: var(--s-6);
  box-shadow: 0 16px 32px rgba(26,31,23,.1);
  transform: translateY(2px);
  transition: transform var(--dur-fast) var(--ease);
}
.nav-has-menu:hover .mega-menu-inner,
.nav-has-menu:focus-within .mega-menu-inner {
  transform: translateY(0);
}
.mega-menu-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-8); }
.mega-menu-eyebrow { display: block; font-size: .72rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); margin-bottom: var(--s-4); }
.mega-menu-col ul { display: grid; gap: var(--s-1); }
.mega-menu-col ul a { display: flex; align-items: center; justify-content: space-between; gap: var(--s-2); padding-block: var(--s-2); font-size: .88rem; font-weight: 600; color: var(--ink); }
.mega-menu-col ul a span { font-size: .72rem; font-weight: 700; color: var(--ink-soft); }
.mega-menu-col ul a:hover { color: var(--accent-ink); }
.mega-menu-all { display: inline-block; margin-top: var(--s-4); font-size: .8rem; font-weight: 700; color: var(--accent-ink); border-bottom: 1px solid var(--accent-ink); padding-bottom: 1px; }
.mega-menu-all:hover { color: var(--ink); border-color: var(--ink); }
.mega-menu-footer {
  display: flex; align-items: center; justify-content: center; gap: var(--s-2);
  margin-top: var(--s-6); padding-top: var(--s-5);
  border-top: 1px solid var(--line);
  font-size: .85rem; font-weight: 700; color: var(--ink);
}
.mega-menu-footer:hover { color: var(--accent-ink); }
.mega-menu-footer svg { transition: transform var(--dur-fast) var(--ease); }
.mega-menu-footer:hover svg { transform: translateX(2px); }

/* ---- Products submenu (mobile accordion) ---- */
.mobile-nav-row { display: flex; align-items: center; justify-content: space-between; gap: var(--s-4); }
.mobile-submenu-toggle { width: 36px; height: 36px; flex-shrink: 0; display: inline-flex; align-items: center; justify-content: center; color: var(--ink-faint); background: none; border: none; padding: 0; transition: transform var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease); }
.mobile-nav-item.is-open .mobile-submenu-toggle { transform: rotate(180deg); color: var(--ink); }
.mobile-nav .mobile-submenu { display: none; gap: var(--s-4); margin-top: var(--s-5); padding-left: var(--s-5); border-left: 1.5px solid var(--line); }
.mobile-nav-item.is-open .mobile-submenu { display: grid; }
.mobile-nav .mobile-submenu a { font-size: 1.05rem; font-weight: 500; color: var(--ink-soft); }
.mobile-submenu-head { display: block; font-size: .68rem; font-weight: 700; letter-spacing: .08em; text-transform: uppercase; color: var(--accent-ink); margin-top: var(--s-2); }
.mobile-submenu li:first-child .mobile-submenu-head { margin-top: 0; }

/* ---- Mobile nav overlay ---- */
.mobile-nav {
  position: fixed; inset: 0; z-index: 200;
  background: var(--bg);
  padding: var(--s-6) var(--gutter);
  display: flex; flex-direction: column;
  transform: translateX(100%);
  transition: transform var(--dur-med) var(--ease);
}
.mobile-nav.is-open { transform: translateX(0); }
.mobile-nav-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--s-16); }
.mobile-nav nav ul { display: grid; gap: var(--s-8); }
.mobile-nav nav a { font-size: 2rem; font-weight: 600; letter-spacing: -.01em; }
.mobile-nav .btn { margin-top: auto; justify-content: center; }
@media (min-width: 981px) { .mobile-nav { display: none; } }

/* ---- Footer ---- */
.site-footer { background: var(--charcoal); color: var(--on-dark); }
.site-footer h4 { color: var(--on-dark); font-size: .78rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; margin-bottom: var(--s-4); }
.site-footer a { color: var(--on-dark-soft); font-size: .92rem; }
.site-footer a:hover { color: var(--white); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr 1fr 1fr; gap: var(--s-8); padding-block: var(--s-24) var(--s-12); }
.footer-bottom { border-top: 1px solid rgba(239,243,238,.12); padding-block: var(--s-6); display: flex; justify-content: space-between; flex-wrap: wrap; gap: var(--s-3); font-size: .8rem; color: var(--on-dark-soft); }
@media (max-width: 900px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }

/* ---- Utility ---- */
.text-center { text-align: center; }
.mx-auto { margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

/* ---- Process photo strip (real IRA process photos: strain library to packaging) ---- */
.process-photos { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--s-6); margin-top: var(--s-12); }
.process-photos figure { margin: 0; }
.process-photos .pp-img { aspect-ratio: 4/3; border-radius: var(--radius); overflow: hidden; background: var(--sage); }
.process-photos img { width: 100%; height: 100%; object-fit: cover; display: block; }
.process-photos figcaption { margin-top: var(--s-3); font-size: .85rem; font-weight: 700; display: flex; gap: var(--s-3); align-items: baseline; }
.process-photos figcaption span { font-family: var(--font-serif); font-style: italic; font-weight: 400; font-size: 1.1rem; color: var(--ink-faint); }
@media (max-width: 860px) { .process-photos { grid-template-columns: 1fr 1fr; gap: var(--s-5); } }