/* ==========================================================================
   IL-REP — Integrated Life Sciences Research & Publishing Platform
   Shared stylesheet
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600;8..60,700&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@500&display=swap');

:root{
  --ink:        #10233A;
  --steel:      #3C4C5C;
  --steel-60:   #5E6E7D;
  --teal:       #1F7A8C;
  --teal-dark:  #155A68;
  --line:       #CBD2D8;
  --line-soft:  #E4E8EB;
  --paper:      #F5F6F4;
  --white:      #FFFFFF;

  --serif: 'Source Serif 4', Georgia, serif;
  --sans:  'IBM Plex Sans', -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  --mono:  'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

  --max: 1080px;
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }
body{
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important; }
}

:focus-visible{
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

.wrap{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 28px;
}

/* ---------- eyebrow / small caps label ---------- */
.eyebrow{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-dark);
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:"";
  width: 22px;
  height: 1px;
  background: var(--teal);
  display:inline-block;
}

/* ---------- helix divider (signature element) ---------- */
.helix-rule{
  width:100%;
  height: 14px;
  display:block;
}

/* ---------- header / masthead ---------- */
.masthead{
  border-bottom: 1px solid var(--ink);
  background: var(--white);
  position: sticky;
  top:0;
  z-index: 50;
}
.masthead .wrap{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding-top:16px;
  padding-bottom:16px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
}
.brand svg, .brand img{ width:38px; height:auto; flex-shrink:0; }
.brand-text{ line-height:1.15; }
.brand-text .name{
  font-family: var(--serif);
  font-weight:700;
  font-size: 21px;
  letter-spacing: 0.01em;
  color: var(--ink);
}
.brand-text .sub{
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--steel-60);
}

nav.primary{ display:flex; align-items:center; gap: 30px; }
nav.primary a{
  font-size: 14.5px;
  font-weight: 500;
  color: var(--steel);
  position:relative;
  padding: 4px 0;
  white-space: nowrap;
}
nav.primary a:hover{ color: var(--teal-dark); }
nav.primary a.active{ color: var(--ink); }
nav.primary a.active::after{
  content:"";
  position:absolute;
  left:0; right:0; bottom:-3px;
  height:2px;
  background: var(--teal);
}

.nav-wrap{
  display:flex;
  align-items:center;
  gap: 26px;
}

.menu-toggle{
  display:none;
  flex-direction:column;
  gap:5px;
  background:none;
  border:none;
  cursor:pointer;
  padding: 6px;
}
.menu-toggle span{
  width:24px; height:2px; background: var(--ink); display:block;
}

@media (max-width: 760px){
  .nav-wrap{ gap: 10px; }
  nav.primary{
    position:fixed;
    inset: 69px 0 0 0;
    background: var(--white);
    flex-direction:column;
    align-items:flex-start;
    gap:0;
    padding: 10px 28px 30px;
    transform: translateY(-8px);
    opacity:0;
    pointer-events:none;
    transition: opacity .2s ease, transform .2s ease;
    border-bottom: 1px solid var(--line);
  }
  nav.primary.open{
    opacity:1;
    transform: translateY(0);
    pointer-events:auto;
  }
  nav.primary a{
    width:100%;
    padding: 14px 0;
    border-bottom: 1px solid var(--line-soft);
    font-size: 16px;
  }
  .menu-toggle{ display:flex; }
}

/* ---------- footer ---------- */
footer{
  border-top: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  margin-top: 90px;
}
footer .wrap{
  padding: 44px 28px 32px;
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap: 28px;
}
footer .col{ max-width: 360px; }
footer .col .name{
  font-family: var(--serif);
  font-size: 18px;
  font-weight:600;
  margin-bottom: 8px;
}
footer .col p{
  font-size: 13.5px;
  color: #B9C4CD;
  line-height:1.65;
}
footer .journal-link{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top: 16px;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing:.04em;
  color: var(--paper);
  border: 1px solid #3A5164;
  padding: 10px 16px;
  transition: border-color .15s ease, background .15s ease;
}
footer .journal-link:hover{ border-color: var(--teal); background: rgba(31,122,140,.15); }
footer .journal-link::after{ content:"→"; }
footer .pi{
  font-size: 13px;
  color: #8FA0AE;
  margin-top:auto;
}
.foot-bottom{
  border-top: 1px solid #23374A;
  text-align:center;
  padding: 16px 28px 26px;
  font-size: 12px;
  color: #6E8494;
  font-family: var(--mono);
  letter-spacing: .03em;
}

/* ==========================================================================
   HOME PAGE
   ========================================================================== */
.hero{
  padding: 64px 0 56px;
  border-bottom: 1px solid var(--line);
}
.hero .kicker{
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color: var(--teal-dark);
  margin-bottom: 20px;
}
.hero h1{
  font-family: var(--serif);
  font-size: clamp(34px, 6vw, 58px);
  font-weight:700;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 15ch;
}
.hero .dek{
  margin-top: 22px;
  font-size: 17px;
  color: var(--steel);
  max-width: 56ch;
  line-height:1.7;
}
.hero .pi-line{
  margin-top: 28px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--steel-60);
  letter-spacing:.02em;
}
.hero .pi-line b{ color:var(--ink); font-weight:600; }

/* table-of-contents style section list */
.toc{
  padding: 8px 0 30px;
}
.toc .toc-head{
  padding: 40px 0 24px;
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap: 16px;
  border-bottom: 1px solid var(--line);
}
.toc .toc-head h2{
  font-family: var(--serif);
  font-size: 26px;
  font-weight:600;
}
.toc .toc-head span{
  font-family: var(--mono);
  font-size: 12px;
  color: var(--steel-60);
}

.division{
  display:grid;
  grid-template-columns: 90px 1fr 190px;
  gap: 28px;
  align-items:start;
  padding: 34px 0;
  border-bottom: 1px solid var(--line-soft);
  transition: background .15s ease;
}
.division:hover{ background: rgba(31,122,140,.04); }
.division .numeral{
  font-family: var(--serif);
  font-size: 44px;
  font-weight: 600;
  color: var(--line);
  line-height:1;
}
.division:hover .numeral{ color: var(--teal); }
.division .body h3{
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 8px;
}
.division .body p{
  font-size: 14.5px;
  color: var(--steel);
  max-width: 62ch;
}
.division .tag{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing:.06em;
  text-transform:uppercase;
  color: var(--teal-dark);
  display:block;
  margin-bottom: 6px;
}
.division .go{
  align-self:center;
  justify-self:end;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing:.03em;
  color: var(--steel);
  white-space:nowrap;
}
.division:hover .go{ color: var(--teal-dark); }
.division .go::after{ content:" →"; }

@media (max-width: 620px){
  .division{ grid-template-columns: 48px 1fr; }
  .division .go{ grid-column: 2; justify-self:start; margin-top:6px; }
  .division .numeral{ font-size: 30px; }
}

/* ==========================================================================
   INTERIOR (DIVISION) PAGES
   ========================================================================== */
.page-hero{
  padding: 56px 0 44px;
  border-bottom: 1px solid var(--line);
}
.page-hero h1{
  font-family: var(--serif);
  font-size: clamp(30px, 5vw, 46px);
  font-weight:700;
  line-height:1.12;
  margin-top: 18px;
  max-width: 20ch;
}
.page-hero .dek{
  margin-top: 18px;
  font-size: 16.5px;
  color: var(--steel);
  max-width: 60ch;
}

.section-block{
  padding: 46px 0;
  border-bottom: 1px solid var(--line-soft);
}
.section-grid{
  display:grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
}
.section-block .label-col{
  display:flex;
  flex-direction: column;
  gap: 10px;
}
.section-block .label-col .idx{
  font-family: var(--mono);
  font-size: 12px;
  color: var(--teal-dark);
  letter-spacing:.08em;
}
.section-block .label-col h2{
  font-family: var(--serif);
  font-size: 21px;
  font-weight:600;
  line-height:1.3;
  color: var(--ink);
}
.section-block .content p{
  font-size: 15.5px;
  color: var(--steel);
  max-width: 68ch;
  line-height: 1.75;
}
.section-block .content p + p{ margin-top: 14px; }

@media (max-width: 760px){
  .section-grid{ grid-template-columns: 1fr; gap: 16px; }
}

/* clause list — numbered protocol items */
.clauses{
  margin-top: 22px;
  border-top: 1px solid var(--line-soft);
}
.clause{
  display:grid;
  grid-template-columns: 46px 1fr;
  gap: 18px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}
.clause .n{
  font-family: var(--mono);
  font-size: 13px;
  color: var(--teal);
  padding-top: 2px;
}
.clause h4{
  font-family: var(--sans);
  font-size: 15px;
  font-weight:600;
  color: var(--ink);
  margin-bottom: 4px;
}
.clause p{
  font-size: 14.5px;
  color: var(--steel);
  line-height:1.65;
  max-width: 66ch;
}

/* callout / practice note card */
.callout{
  margin-top: 28px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--teal);
  padding: 22px 24px;
}
.callout .tag{
  font-family: var(--mono);
  font-size: 11px;
  text-transform:uppercase;
  letter-spacing:.08em;
  color: var(--teal-dark);
  display:block;
  margin-bottom: 8px;
}
.callout p{ font-size: 14.5px; color: var(--steel); line-height:1.7; }

/* cross-link to other divisions */
.next-links{
  padding: 50px 0 10px;
}
.next-links .eyebrow{ margin-bottom: 22px; }
.next-grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
}
.next-card{
  border: 1px solid var(--line);
  background: var(--white);
  padding: 20px 22px;
  transition: border-color .15s ease;
}
.next-card:hover{ border-color: var(--teal); }
.next-card .tag{
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing:.06em;
  text-transform:uppercase;
  color: var(--steel-60);
}
.next-card h4{
  font-family: var(--serif);
  font-size: 17px;
  font-weight:600;
  margin-top: 6px;
  color: var(--ink);
}
.next-card .go{
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--teal-dark);
}
.next-card .go::after{ content:" →"; }

@media (max-width: 620px){
  .next-grid{ grid-template-columns: 1fr; }
}