/* =========================================================
   FLA PEPTIDES — design tokens
   Display: Source Serif 4 (editorial/clinical serif)
   Body:    IBM Plex Sans
   Mono:    IBM Plex Mono (lab data, panel codes, captions)
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:ital,opsz,wght@0,8..60,400;0,8..60,500;0,8..60,600;0,8..60,700;1,8..60,500&family=IBM+Plex+Sans:wght@400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root{
  --ink: #13233B;
  --ink-70: #13233Bb3;
  --paper: #F5F7F9;
  --paper-alt: #E7EEF3;
  --white: #FFFFFF;
  --teal: #2B6CB0;
  --teal-deep: #184A7D;
  --teal-tint: #E3EEF8;
  --citrus: #5B9BD5;
  --citrus-deep: #2F6FA8;
  --slate: #5C6B78;
  --approved: #3F7A55;
  --approved-tint: #E7F0E9;
  --line: #D6DEE5;
  --line-strong: #AFC0CB;
  --radius: 3px;
  --maxw: 1180px;
  --shadow: 0 1px 0 rgba(19,35,59,0.04), 0 12px 24px -16px rgba(19,35,59,0.18);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'IBM Plex Sans', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
h1,h2,h3,h4{
  font-family: 'Source Serif 4', Georgia, serif;
  font-weight: 600;
  line-height: 1.12;
  margin: 0 0 .5em;
  color: var(--ink);
  letter-spacing: -0.01em;
}
h1{ font-size: clamp(2.2rem, 4.4vw, 3.6rem); font-weight: 600; }
h2{ font-size: clamp(1.7rem, 2.6vw, 2.3rem); }
h3{ font-size: 1.25rem; }
p{ margin: 0 0 1em; color: var(--ink-70); }
a{ color: var(--teal-deep); text-decoration: none; }
img{ max-width: 100%; display:block; }
.serif-italic{ font-style: italic; font-weight: 500; color: var(--teal-deep); }

.mono, .eyebrow, .tag, .panel-code, .step-num, .stat-num, nav a, .btn, .chip{
  font-family: 'IBM Plex Mono', 'Courier New', monospace;
}

.wrap{ max-width: var(--maxw); margin: 0 auto; padding: 0 28px; }
.section{ padding: 88px 0; }
.section--tight{ padding: 56px 0; }
.section--alt{ background: var(--paper-alt); }
.section--ink{ background: var(--ink); color: var(--paper); }
.section--ink h2, .section--ink h3{ color: var(--paper); }
.section--ink p{ color: #C9D2D6; }

.eyebrow{
  display:inline-flex; align-items:center; gap:8px;
  font-size: .72rem; letter-spacing: .12em; text-transform: uppercase;
  color: var(--teal-deep); font-weight: 500; margin-bottom: 14px;
}
.eyebrow::before{ content:""; width:16px; height:1px; background: var(--citrus); display:inline-block; }
.section--ink .eyebrow{ color: var(--citrus); }
.section--ink .eyebrow::before{ background: var(--citrus); }

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  padding: 13px 22px; border-radius: var(--radius);
  font-size: .82rem; letter-spacing: .04em; text-transform: uppercase;
  font-weight: 500; border: 1px solid transparent; cursor:pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease, color .15s ease;
  white-space: nowrap;
}
.btn:focus-visible{ outline: 2px solid var(--citrus); outline-offset: 2px; }
.btn--primary{ background: var(--teal); color: var(--white); }
.btn--primary:hover{ background: var(--teal-deep); transform: translateY(-1px); }
.btn--citrus{ background: var(--citrus); color: var(--ink); }
.btn--citrus:hover{ background: var(--citrus-deep); transform: translateY(-1px); color:var(--white);}
.btn--ghost{ background: transparent; color: var(--ink); border-color: var(--line-strong); }
.btn--ghost:hover{ background: rgba(16,31,46,0.05); }
.btn--ghost-light{ background: transparent; color: var(--paper); border-color: rgba(250,247,241,0.35); }
.btn--ghost-light:hover{ background: rgba(250,247,241,0.08); }
.btn--sm{ padding: 9px 16px; font-size: .74rem; }
.btn--block{ width:100%; }

.cta-row{ display:flex; gap:14px; flex-wrap:wrap; align-items:center; }

/* ---------- header / nav ---------- */
header.site{
  position: sticky; top:0; z-index: 40;
  background: rgba(250,247,241,0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.nav-inner{ display:flex; align-items:center; justify-content:space-between; padding: 18px 0; }
.brand{ display:flex; align-items:center; gap:10px; font-family:'Source Serif 4', serif; font-weight:700; font-size:1.15rem; color: var(--ink); }
.brand .mark{
  width:36px; height:36px;
  display:flex; align-items:center; justify-content:center;
  flex-shrink:0;
}
.brand .mark img{ width:100%; height:100%; object-fit:contain; display:block; }
.brand small{ display:block; font-family:'IBM Plex Mono', monospace; font-size:.6rem; letter-spacing:.1em; color: var(--slate); font-weight: 500; text-transform: uppercase; }

nav.primary{ display:flex; align-items:center; gap:28px; }
nav.primary a{
  font-size: .74rem; letter-spacing:.06em; text-transform: uppercase;
  color: var(--ink); font-weight:500; padding: 6px 0; border-bottom: 2px solid transparent;
}
nav.primary a:hover, nav.primary a.active{ border-color: var(--citrus); }
.nav-actions{ display:flex; align-items:center; gap:10px; }
.menu-toggle{ display:none; background:none; border:1px solid var(--line-strong); border-radius: var(--radius); padding: 8px 10px; cursor:pointer; }
.menu-toggle span{ display:block; width:18px; height:2px; background: var(--ink); margin:3px 0; }

@media (max-width: 900px){
  nav.primary{
    position:absolute; top:100%; left:0; right:0; background: var(--paper);
    flex-direction:column; align-items:flex-start; gap:0; padding: 8px 28px 18px;
    border-bottom: 1px solid var(--line); display:none;
  }
  nav.primary.open{ display:flex; }
  nav.primary a{ width:100%; padding: 12px 0; border-bottom:1px solid var(--line); }
  .menu-toggle{ display:block; }
  .nav-actions .btn span.long{ display:none; }
}

/* ---------- hero ---------- */
.hero{ padding: 64px 0 80px; }
.hero-grid{ display:grid; grid-template-columns: 1.1fr .9fr; gap: 56px; align-items:center; }
.hero h1{ margin-bottom: .55em; }
.hero .lede{ font-size: 1.08rem; max-width: 46ch; }
.trust-strip{ display:flex; flex-wrap:wrap; gap: 26px; margin-top: 36px; padding-top: 26px; border-top: 1px solid var(--line); }
.trust-item{ display:flex; align-items:baseline; gap:8px; font-size:.78rem; color: var(--slate); }
.trust-item strong{ color: var(--ink); font-family:'Source Serif 4', serif; font-size: 1rem; }

@media (max-width: 900px){ .hero-grid{ grid-template-columns: 1fr; } }

/* ---------- signature: lab requisition panel ---------- */
.panel{
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  position: relative;
  padding: 26px 26px 22px;
}
.panel::before{
  content:""; position:absolute; left:-8px; top:34px; bottom:34px; width:16px;
  background: repeating-linear-gradient(to bottom, transparent 0 8px, var(--paper) 8px 9px);
}
.panel-head{ display:flex; justify-content:space-between; align-items:flex-start; border-bottom:1px dashed var(--line-strong); padding-bottom:14px; margin-bottom:16px; }
.panel-code{ font-size:.68rem; color: var(--slate); letter-spacing:.05em; }
.panel-code b{ color: var(--ink); }
.stamp{
  font-family:'IBM Plex Mono', monospace; font-size:.62rem; letter-spacing:.08em; text-transform:uppercase;
  border: 1.5px solid var(--approved); color: var(--approved); padding: 4px 9px; border-radius: 2px;
  transform: rotate(-4deg); font-weight:600; white-space:nowrap;
}
.stamp--pending{ border-color: var(--citrus-deep); color: var(--citrus-deep); }
.panel-row{ display:flex; justify-content:space-between; gap:12px; font-size:.85rem; padding: 7px 0; border-bottom: 1px solid var(--paper-alt); }
.panel-row span:first-child{ color: var(--slate); }
.panel-row span:last-child{ font-family:'IBM Plex Mono', monospace; font-size:.78rem; color: var(--ink); font-weight:500; }
.panel-foot{ margin-top:16px; padding-top:14px; border-top:1px dashed var(--line-strong); font-size:.72rem; color: var(--slate); }

/* ---------- pathway / steps ---------- */
.pathway{ position:relative; }
.step-track{ display:grid; grid-template-columns: repeat(4,1fr); gap:22px; margin-top:44px; position:relative; }
.step-track::before{
  content:""; position:absolute; top:26px; left:0; right:0; height:0;
  border-top: 1px dashed var(--line-strong); z-index:0;
}
@media (max-width: 900px){ .step-track{ grid-template-columns: 1fr; } .step-track::before{ display:none; } }
.step{ position:relative; z-index:1; background: var(--paper); }
.step-num{
  width:44px; height:44px; border-radius: 50%; background: var(--ink); color: var(--paper);
  display:flex; align-items:center; justify-content:center; font-size:.9rem; font-weight:600; margin-bottom:16px;
  border: 4px solid var(--paper);
}
.section--alt .step-num{ border-color: var(--paper-alt); }
.step h3{ font-size:1.05rem; margin-bottom:.35em; }
.step p{ font-size:.92rem; }
.step .tag{ display:inline-block; margin-top:8px; font-size:.66rem; color: var(--slate); letter-spacing:.04em; }

/* ---------- cards ---------- */
.grid{ display:grid; gap: 22px; }
.grid--3{ grid-template-columns: repeat(3, 1fr); }
.grid--4{ grid-template-columns: repeat(4, 1fr); }
.grid--2{ grid-template-columns: repeat(2, 1fr); }
@media (max-width: 980px){ .grid--3, .grid--4{ grid-template-columns: repeat(2,1fr); } }
@media (max-width: 640px){ .grid--3, .grid--4, .grid--2{ grid-template-columns: 1fr; } }

.card{
  background: var(--white); border:1px solid var(--line); border-radius: var(--radius);
  padding: 24px; transition: box-shadow .15s ease, transform .15s ease;
}
.card:hover{ box-shadow: var(--shadow); transform: translateY(-2px); }

.tag{
  display:inline-block; font-size:.65rem; letter-spacing:.06em; text-transform:uppercase;
  padding: 4px 9px; border-radius: 2px; background: var(--teal-tint); color: var(--teal-deep); font-weight:500;
}
.tag--citrus{ background: #D9E8F5; color: var(--citrus-deep); }
.tag--approved{ background: var(--approved-tint); color: var(--approved); }

.chip-row{ display:flex; flex-wrap:wrap; gap:6px; margin: 10px 0; }
.chip{
  font-size:.68rem; background: var(--paper-alt); border:1px solid var(--line); color: var(--ink);
  padding: 4px 9px; border-radius: 2px;
}

/* ---------- peptide panel card (library) ---------- */
.pep-card{
  background: var(--white); border:1px solid var(--line); border-radius: var(--radius);
  padding: 26px; position:relative; overflow:hidden;
}
.pep-card-top{ display:flex; justify-content:space-between; align-items:flex-start; gap:14px; margin-bottom: 10px; }
.pep-card h3{ margin-bottom:4px; }
.pep-sub{ font-size:.78rem; color: var(--slate); }
.pep-block{ margin-top:14px; padding-top:14px; border-top: 1px solid var(--paper-alt); }
.pep-block h4{ font-family:'IBM Plex Mono', monospace; text-transform:uppercase; letter-spacing:.06em; font-size:.68rem; color: var(--slate); margin:0 0 8px; font-weight:600; }
.pep-block p, .pep-block li{ font-size:.9rem; }
.pep-block ul{ margin:0; padding-left:1.1em; }

/* filter tabs */
.filters{ display:flex; gap:10px; flex-wrap:wrap; margin: 26px 0 6px; }
.filter-btn{
  font-family:'IBM Plex Mono', monospace; font-size:.72rem; letter-spacing:.03em;
  padding: 8px 14px; border-radius: 999px; border:1px solid var(--line-strong); background: transparent; cursor:pointer; color: var(--ink);
}
.filter-btn.active{ background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ---------- accordion (FAQ) ---------- */
.accordion-item{ border-bottom: 1px solid var(--line); }
.accordion-q{
  width:100%; text-align:left; background:none; border:none; cursor:pointer;
  padding: 20px 0; display:flex; justify-content:space-between; align-items:center; gap:16px;
  font-family:'Source Serif 4', serif; font-size:1.05rem; color: var(--ink); font-weight:600;
}
.accordion-q .plus{ font-family:'IBM Plex Mono', monospace; font-size:1.1rem; color: var(--teal-deep); flex-shrink:0; transition: transform .2s ease; }
.accordion-item.open .plus{ transform: rotate(45deg); }
.accordion-a{ max-height:0; overflow:hidden; transition: max-height .25s ease; }
.accordion-a-inner{ padding: 0 0 22px; max-width: 68ch; }
.accordion-item.open .accordion-a{ max-height: 600px; }

/* ---------- quote / callout ---------- */
.callout{
  border-left: 3px solid var(--citrus); background: var(--white); padding: 20px 24px; border-radius: 0 var(--radius) var(--radius) 0;
}

/* ---------- footer ---------- */
footer.site{ background: var(--ink); color: #C9D2D6; padding: 60px 0 30px; }
footer.site h4{ color: var(--paper); font-family:'IBM Plex Mono', monospace; font-size:.72rem; letter-spacing:.08em; text-transform:uppercase; margin-bottom:14px; font-weight:600; }
footer.site a{ color:#C9D2D6; }
footer.site a:hover{ color: var(--citrus); }
.foot-grid{ display:grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; }
.foot-grid ul{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:9px; font-size:.85rem; }
.foot-brand p{ color:#98A6AB; font-size:.85rem; max-width: 34ch; }
.foot-legal{ margin-top:44px; padding-top:22px; border-top:1px solid rgba(255,255,255,0.12); font-size:.72rem; color:#8B9A9C; line-height:1.7; }
@media (max-width: 900px){ .foot-grid{ grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px){ .foot-grid{ grid-template-columns: 1fr; } }

/* ---------- utility ---------- */
.center{ text-align:center; }
.max-w{ max-width: 62ch; }
.mx-auto{ margin-left:auto; margin-right:auto; }
.mt-0{margin-top:0;}
.section-head{ max-width: 640px; margin-bottom: 40px; }
.small{ font-size:.82rem; color: var(--slate); }
.two-col{ display:grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items:start; }
@media (max-width: 900px){ .two-col{ grid-template-columns: 1fr; } }

.page-hero{ padding: 56px 0 44px; border-bottom: 1px solid var(--line); }
.page-hero .lede{ max-width: 58ch; }

/* reduced motion */
@media (prefers-reduced-motion: reduce){
  *{ scroll-behavior: auto !important; transition: none !important; }
}

/* ---------- blog ---------- */
.blog-card{
  background: var(--white); border:1px solid var(--line); border-radius: var(--radius);
  padding: 26px; display:flex; flex-direction:column; height:100%;
}
.blog-card:hover{ box-shadow: var(--shadow); }
.blog-meta{ font-family:'IBM Plex Mono', monospace; font-size:.68rem; letter-spacing:.05em; text-transform:uppercase; color: var(--slate); margin-bottom:10px; }
.blog-card h3{ font-size:1.15rem; margin-bottom:8px; }
.blog-card p{ font-size:.9rem; flex-grow:1; }
.blog-card .btn{ align-self:flex-start; margin-top:14px; }

.blog-feature{
  display:grid; grid-template-columns: 1fr 1fr; gap:0; border:1px solid var(--line); border-radius: var(--radius);
  overflow:hidden; background: var(--white);
}
.blog-feature-copy{ padding: 34px; display:flex; flex-direction:column; justify-content:center; }
.blog-feature-visual{
  background: var(--ink); color: var(--paper); padding: 34px; display:flex; flex-direction:column; justify-content:center;
  position:relative;
}
.blog-feature-visual::before{
  content:""; position:absolute; inset:14px; border:1px solid rgba(250,247,241,0.18); border-radius:2px;
}
@media (max-width: 860px){ .blog-feature{ grid-template-columns: 1fr; } }

.article-hero{ padding: 52px 0 8px; }
.article-meta{ display:flex; gap:16px; flex-wrap:wrap; align-items:center; font-size:.75rem; color: var(--slate); margin-bottom:18px; }
.article-meta .chip{ background: var(--paper-alt); }

article.post{ max-width: 72ch; }
article.post h2{ margin-top: 1.6em; font-size:1.5rem; }
article.post h2:first-child{ margin-top:0; }
article.post p{ font-size: 1rem; }
article.post ul, article.post ol{ padding-left: 1.3em; color: var(--ink-70); }
article.post li{ margin-bottom: .4em; }
article.post strong{ color: var(--ink); }
article.post hr{ border:none; border-top:1px solid var(--line); margin: 2.2em 0; }
article.post em{ color: var(--slate); }
.post-disclaimer{
  font-size:.82rem; color: var(--slate); border-left: 3px solid var(--line-strong);
  padding: 12px 18px; background: var(--paper-alt); margin: 1.6em 0;
}
.post-cta{
  margin-top: 2em; padding: 24px; background: var(--teal-tint); border-radius: var(--radius);
  display:flex; flex-wrap:wrap; gap:14px; align-items:center; justify-content:space-between;
}
.post-cta p{ margin:0; font-family:'Source Serif 4', serif; font-size:1.1rem; color: var(--ink); }
.share-row{ display:flex; gap:10px; margin-top:28px; }
.tag-row{ display:flex; gap:8px; flex-wrap:wrap; margin-bottom:18px; }

/* ---------- line icons ---------- */
.icon{ width:22px; height:22px; flex-shrink:0; }
.icon-lg{ width:30px; height:30px; }
.icon-teal{ color: var(--teal); }
.icon-ink{ color: var(--ink); }
.icon-approved{ color: var(--approved); }
.step-icon{ margin-bottom:12px; color: var(--teal); }
.trust-item{ display:flex; align-items:center; gap:10px; }
.trust-item .icon{ color: var(--teal); }
.panel-icon{ margin-bottom: 10px; color: var(--teal); }