/* ==========================================================================
   Arshiya Patel — career site
   Design language: field notebook / surveillance ledger.
   Paper background, navy ink, one signal-red accent (case-marker red),
   one lab-teal accent for methods/tags. Serif for headlines (journal
   register, nods to JAMDA/Vaccine), Plex Sans for body/UI, Plex Mono
   reserved for numerals, dates and small data labels only.
   ========================================================================== */

@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&family=IBM+Plex+Mono:wght@400;500&display=swap');

:root{
  --paper: #F6F3EA;
  --paper-dim: #EFEAdc;
  --ink: #16213A;
  --ink-soft: #47536A;
  --ink-faint: #8891A0;
  --rule: #D9D2BC;
  --rule-strong: #C7BEA0;
  --signal: #AE3A32;
  --signal-dim: #8f2f29;
  --lab: #2E6B67;
  --lab-dim: #244f4c;
  --white: #FFFFFE;

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

  --measure: 62ch;
  --max-w: 1040px;
}

*, *::before, *::after{ box-sizing: border-box; }

html{ scroll-behavior: smooth; }

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

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a{ color: var(--ink); }
a:hover{ color: var(--signal); }
a:focus-visible, button:focus-visible, summary:focus-visible{
  outline: 2px solid var(--signal);
  outline-offset: 3px;
}

img{ max-width: 100%; display: block; }

h1, h2, h3, h4{
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  color: var(--ink);
}

h1{ font-size: clamp(2.1rem, 4.4vw, 3.2rem); font-weight: 600; }
h2{ font-size: clamp(1.5rem, 2.6vw, 1.9rem); }
h3{ font-size: 1.15rem; font-weight: 600; }

p{ margin: 0 0 1.1em; max-width: var(--measure); color: var(--ink-soft); }

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

/* ---------- top nav ---------- */
.site-header{
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
}

.nav-row{
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
  gap: 20px;
}

.mark{
  font-family: var(--serif);
  font-size: 1.15rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
  white-space: nowrap;
}
.mark span{ color: var(--signal); }

.nav-links{
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.93rem;
}
.nav-links li{ margin-right: 20px; }
.nav-links li:last-child{ margin-right: 0; }

.nav-links a{
  text-decoration: none;
  color: var(--ink-soft);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
}
.nav-links a:hover{ color: var(--ink); border-bottom-color: var(--signal); }
.nav-links a[aria-current="page"]{
  color: var(--ink);
  border-bottom: 1px solid var(--signal);
}

.nav-toggle{
  display: none;
  background: none;
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 7px 10px;
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink);
  cursor: pointer;
}

@media (max-width: 760px){
  .nav-toggle{ display: inline-block; }
  .nav-links{
    display: none;
    flex-direction: column;
    width: 100%;
    padding-top: 10px;
    gap: 12px;
  }
  .nav-links.open{ display: flex; }
  .nav-row{ flex-wrap: wrap; }
}

/* ---------- hero / index card ---------- */
.hero{
  padding: 64px 0 40px;
  border-bottom: 1px solid var(--rule);
}

.eyebrow-line{
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-faint);
  letter-spacing: 0.01em;
  margin-bottom: 14px;
}

.hero h1{ max-width: 15ch; }

.hero .lede{
  max-width: 58ch;
  font-size: 1.12rem;
  color: var(--ink-soft);
  margin-top: 14px;
}

/* stat ledger: a row of figures separated by hairlines, not cards */
.ledger{
  display: flex;
  flex-wrap: wrap;
  margin-top: 32px;
  border-top: 1px solid var(--rule);
}

.ledger dl{
  margin: 0;
  padding: 16px 26px 16px 0;
  border-right: 1px solid var(--rule);
}
.ledger dl:last-child{ border-right: none; }

.ledger dt{
  font-family: var(--mono);
  font-size: 1.55rem;
  color: var(--ink);
  margin: 0;
}
.ledger dd{
  margin: 4px 0 0;
  font-size: 0.85rem;
  color: var(--ink-faint);
  max-width: 16ch;
}

/* ---------- practice index (landing page list of domains) ---------- */
.index-list{
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.index-row{
  border-bottom: 1px solid var(--rule);
}

.index-row a{
  display: grid;
  grid-template-columns: 2.4fr 3fr auto;
  gap: 24px;
  align-items: baseline;
  text-decoration: none;
  padding: 26px 0;
  color: var(--ink);
}

.index-row a:hover .index-title{ color: var(--signal); }
.index-row a:hover .go{ border-color: var(--signal); color: var(--signal); }

.index-title{
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
}

.index-desc{ color: var(--ink-soft); font-size: 0.98rem; }

.go{
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  border: 1px solid var(--rule-strong);
  border-radius: 3px;
  padding: 6px 12px;
  white-space: nowrap;
  justify-self: end;
}

@media (max-width: 700px){
  .index-row a{ grid-template-columns: 1fr; gap: 8px; }
  .go{ justify-self: start; }
}

/* ---------- generic sections ---------- */
.section{
  padding: 56px 0;
  border-bottom: 1px solid var(--rule);
}
.section:last-of-type{ border-bottom: none; }

.section-head{
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 26px;
}

.section-head .tag{
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
}

.two-col{
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 40px;
}
@media (max-width: 760px){
  .two-col{ grid-template-columns: 1fr; }
}

/* expertise list */
.plain-list{ margin: 0; padding: 0; list-style: none; }
.plain-list li{
  padding: 14px 0;
  border-top: 1px solid var(--rule);
  color: var(--ink-soft);
}
.plain-list li:last-child{ border-bottom: 1px solid var(--rule); }
.plain-list strong{ color: var(--ink); font-weight: 600; }

/* ---------- experience timeline ---------- */
.timeline{ margin: 0; padding: 0; }

.tl-item{
  display: grid;
  grid-template-columns: 130px 1fr;
  gap: 22px;
  padding: 22px 0;
  border-top: 1px solid var(--rule);
}
.tl-item:last-child{ border-bottom: 1px solid var(--rule); }

.tl-date{
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-faint);
  padding-top: 3px;
}

.tl-role{ font-weight: 600; color: var(--ink); margin-bottom: 2px; }
.tl-org{ color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 10px; }

.tl-body p{ margin-bottom: 0.6em; font-size: 0.98rem; }
.tl-body ul{ margin: 0.4em 0 0; padding-left: 1.15em; }
.tl-body li{ margin-bottom: 0.4em; color: var(--ink-soft); font-size: 0.98rem; }

@media (max-width: 640px){
  .tl-item{ grid-template-columns: 1fr; gap: 6px; }
}

/* ---------- tag chips (methods/tools) ---------- */
.tagset{ margin-bottom: 22px; }
.tagset h4{
  font-family: var(--sans);
  font-size: 0.82rem;
  text-transform: none;
  color: var(--ink-faint);
  margin: 0 0 10px;
  font-weight: 500;
}
.chips{ display: flex; flex-wrap: wrap; gap: 8px; }
.chip{
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--lab-dim);
  border: 1px solid var(--lab);
  border-radius: 3px;
  padding: 4px 9px;
  background: rgba(46,107,103,0.06);
}

/* ---------- publications ---------- */
.pub{
  border-top: 1px solid var(--rule);
  padding: 24px 0;
}
.pub:last-child{ border-bottom: 1px solid var(--rule); }
.pub-role{
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--signal-dim);
  margin-bottom: 8px;
  display: inline-block;
}
.pub h3{ margin-bottom: 6px; }
.pub .cite{ color: var(--ink-soft); font-size: 0.95rem; margin-bottom: 6px; }
.pub .doi{ font-family: var(--mono); font-size: 0.83rem; color: var(--ink-faint); }
.pub .doi a{ color: var(--ink-faint); }

/* ---------- callout / pull note ---------- */
.pull{
  border-left: 3px solid var(--signal);
  padding: 4px 0 4px 22px;
  margin: 28px 0;
  font-family: var(--serif);
  font-size: 1.2rem;
  color: var(--ink);
  max-width: 46ch;
}

/* ---------- buttons / links-as-actions ---------- */
.btn{
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--ink);
  border-radius: 3px;
  padding: 10px 18px;
  transition: background 0.15s ease, color 0.15s ease;
}
.btn:hover{ background: var(--ink); color: var(--paper); }
.btn.primary{
  border-color: var(--signal);
  color: var(--signal-dim);
}
.btn.primary:hover{ background: var(--signal); color: var(--white); }

/* ---------- contact list ---------- */
.contact-list{ list-style: none; margin: 0; padding: 0; }
.contact-list li{
  border-top: 1px solid var(--rule);
  padding: 18px 0;
  display: flex;
  gap: 18px;
  align-items: baseline;
}
.contact-list li:last-child{ border-bottom: 1px solid var(--rule); }
.contact-list .label{
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  width: 90px;
  flex-shrink: 0;
}
.contact-list a{ text-decoration: none; font-size: 1.02rem; }
.contact-list a:hover{ color: var(--signal); }

/* ---------- footer ---------- */
.site-footer{
  padding: 34px 0 46px;
  color: var(--ink-faint);
  font-size: 0.88rem;
}
.site-footer .foot-row{
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.site-footer a{ color: var(--ink-faint); text-decoration: none; }
.site-footer a:hover{ color: var(--signal); }

/* ---------- about narrative ---------- */
.narrative p{
  max-width: 66ch;
  font-size: 1.04rem;
}
.narrative .drop{
  font-family: var(--serif);
  font-size: 1.3rem;
  color: var(--ink);
}

/* small helper */
.note{
  font-size: 0.88rem;
  color: var(--ink-faint);
  border: 1px dashed var(--rule-strong);
  padding: 12px 16px;
  border-radius: 3px;
  margin: 18px 0;
}