/* ==========================================================================
   Arshiya Patel: career site
   Editorial / scientific register. Warm paper background, deep navy ink,
   a clinical teal as the primary accent and a terracotta marker used
   sparingly (publication roles, the logo dot). Newsreader for headings,
   Inter for body and UI, JetBrains Mono for small data labels only.
   Light and dark themes follow the visitor's system setting.
   ========================================================================== */

:root{
  --bg: #FBFAF7;
  --surface: #FFFFFF;
  --surface-2: #F3F1EC;
  --ink: #0F1B2D;
  --ink-soft: #3F4B5E;
  --ink-faint: #667183;
  --rule: #E4E0D8;
  --rule-strong: #CFC9BD;
  --accent: #0E6E68;
  --accent-strong: #0A5550;
  --accent-tint: rgba(14,110,104,0.08);
  --marker: #B4472F;
  --shadow: 0 1px 2px rgba(15,27,45,0.04), 0 8px 24px rgba(15,27,45,0.06);

  --serif: 'Newsreader', 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;

  --measure: 66ch;
  --max-w: 1120px;
  --radius: 10px;
  --gutter: 24px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark){
  :root{
    --bg: #0E141C;
    --surface: #151D28;
    --surface-2: #1B2531;
    --ink: #E8ECF1;
    --ink-soft: #B6BFCB;
    --ink-faint: #8C97A6;
    --rule: #263241;
    --rule-strong: #34435A;
    --accent: #5BBDB2;
    --accent-strong: #7FD1C7;
    --accent-tint: rgba(91,189,178,0.10);
    --marker: #E48B74;
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 8px 24px rgba(0,0,0,0.25);
  }
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

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

body{
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a{ color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover{ color: var(--accent-strong); }
:focus-visible{ outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }

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

h1, h2, h3, h4{
  font-family: var(--serif);
  font-weight: 600;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
  color: var(--ink);
  text-wrap: balance;
}
h1{ font-size: clamp(2.3rem, 5vw, 3.6rem); font-weight: 500; letter-spacing: -0.02em; }
h2{ font-size: clamp(1.55rem, 2.8vw, 2rem); font-weight: 500; }
h3{ font-size: 1.2rem; }

p{ margin: 0 0 1.1em; max-width: var(--measure); color: var(--ink-soft); }
strong{ color: var(--ink); font-weight: 600; }

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

.skip-link{
  position: absolute; left: 12px; top: -60px; z-index: 100;
  background: var(--ink); color: var(--bg); padding: 10px 14px; border-radius: 6px;
  text-decoration: none; font-size: 0.9rem;
}
.skip-link:focus{ top: 12px; color: var(--bg); }

/* ---------- header / nav ---------- */
.site-header{
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.nav-row{ display: flex; align-items: center; justify-content: space-between; gap: 20px; min-height: 64px; }

.mark{
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--serif); font-size: 1.2rem; font-weight: 600;
  text-decoration: none; color: var(--ink); white-space: nowrap;
}
.mark:hover{ color: var(--ink); }
.mark-badge{
  display: inline-grid; place-items: center;
  width: 32px; height: 32px; border-radius: 8px;
  background: var(--ink); color: var(--bg);
  font-family: var(--sans); font-size: 0.78rem; font-weight: 600; letter-spacing: 0.02em;
}
.mark .dot{ color: var(--marker); }

.nav-links{ display: flex; align-items: center; gap: 4px; list-style: none; margin: 0; padding: 0; font-size: 0.92rem; }
.nav-links a{
  display: block; text-decoration: none; color: var(--ink-soft);
  padding: 7px 11px; border-radius: 6px; transition: background .15s ease, color .15s ease;
}
.nav-links a:hover{ color: var(--ink); background: var(--surface-2); }
.nav-links a[aria-current="page"]{ color: var(--accent-strong); background: var(--accent-tint); font-weight: 500; }

.nav-toggle{
  display: none; align-items: center; gap: 8px;
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--rule-strong); border-radius: 8px;
  padding: 8px 12px; font: 500 0.88rem var(--sans); cursor: pointer;
}
.nav-toggle .bars{ width: 16px; height: 10px; position: relative; display: inline-block; }
.nav-toggle .bars::before, .nav-toggle .bars::after{
  content: ""; position: absolute; left: 0; right: 0; height: 2px; background: currentColor; border-radius: 2px;
  transition: transform .2s ease, top .2s ease;
}
.nav-toggle .bars::before{ top: 1px; }
.nav-toggle .bars::after{ top: 7px; }
.nav-toggle[aria-expanded="true"] .bars::before{ top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .bars::after{ top: 4px; transform: rotate(-45deg); }

@media (max-width: 900px){
  .nav-toggle{ display: inline-flex; }
  .nav-row{ flex-wrap: wrap; }
  .nav-links{
    display: none; flex-direction: column; align-items: stretch;
    width: 100%; padding: 4px 0 14px; gap: 2px; font-size: 1rem;
  }
  .nav-links.open{ display: flex; }
  .nav-links a{ padding: 11px 12px; }
}

/* ---------- hero ---------- */
.hero{ padding: 72px 0 56px; }
.hero-grid{ display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr); gap: 56px; align-items: start; }

.eyebrow{
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.02em;
  color: var(--accent-strong); background: var(--accent-tint);
  padding: 5px 10px; border-radius: 999px; margin-bottom: 20px;
}
.eyebrow::before{ content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); }

.hero h1{ max-width: 18ch; }
.hero .creds{ font-family: var(--sans); font-size: 0.42em; font-weight: 500; color: var(--ink-faint); letter-spacing: 0.02em; white-space: nowrap; }
.lede{ font-size: clamp(1.08rem, 1.6vw, 1.2rem); color: var(--ink-soft); max-width: 60ch; margin-top: 16px; }

.actions{ display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

/* profile card beside the hero */
.profile-card{
  background: var(--surface); border: 1px solid var(--rule); border-radius: 14px;
  padding: 24px; box-shadow: var(--shadow);
}
.profile-top{ display: flex; align-items: center; gap: 14px; margin-bottom: 18px; }
.avatar{
  width: 64px; height: 64px; border-radius: 50%; flex-shrink: 0; object-fit: cover;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent), var(--ink));
  color: #fff; font-family: var(--serif); font-size: 1.5rem; font-weight: 600;
}
.profile-name{ font-family: var(--serif); font-size: 1.15rem; font-weight: 600; color: var(--ink); line-height: 1.2; }
.profile-role{ font-size: 0.88rem; color: var(--ink-faint); }
.facts{ list-style: none; margin: 0; padding: 0; font-size: 0.92rem; }
.facts li{ display: grid; grid-template-columns: 96px 1fr; gap: 10px; padding: 9px 0; border-top: 1px solid var(--rule); color: var(--ink-soft); }
.facts .k{ font-family: var(--mono); font-size: 0.74rem; color: var(--ink-faint); padding-top: 3px; text-transform: uppercase; letter-spacing: 0.04em; }
.profile-links{ display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

@media (max-width: 900px){
  .hero{ padding: 48px 0 40px; }
  .hero-grid{ grid-template-columns: 1fr; gap: 36px; }
}

/* ---------- stat ledger ---------- */
.ledger{
  display: grid; grid-template-columns: repeat(4, minmax(0, 1fr));
  margin: 44px 0 0; border: 1px solid var(--rule); border-radius: var(--radius);
  background: var(--surface); overflow: hidden;
}
.ledger dl{ margin: 0; padding: 18px 20px; border-right: 1px solid var(--rule); }
.ledger dl:last-child{ border-right: none; }
.ledger dt{ font-family: var(--serif); font-size: 2rem; font-weight: 500; color: var(--ink); line-height: 1.1; }
.ledger dd{ margin: 6px 0 0; font-size: 0.86rem; color: var(--ink-faint); line-height: 1.45; }
@media (max-width: 700px){
  .ledger{ grid-template-columns: 1fr 1fr; }
  .ledger dl:nth-child(2n){ border-right: none; }
  .ledger dl:nth-child(-n+2){ border-bottom: 1px solid var(--rule); }
  .ledger dt{ font-size: 1.6rem; }
}

/* ---------- sections ---------- */
.section{ padding: 64px 0; border-top: 1px solid var(--rule); }
.section.tint{ background: var(--surface-2); border-top-color: transparent; }
.section-head{ display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 20px; margin-bottom: 28px; }
.section-head h2{ margin: 0; }
.section-head .tag, .section-head a.tag{ font-family: var(--mono); font-size: 0.8rem; color: var(--ink-faint); text-decoration: none; }
.section-head a.tag:hover{ color: var(--accent); }
.kicker{ font-family: var(--mono); font-size: 0.76rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; display: block; }

.two-col{ display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 2fr); gap: 48px; }
.two-col > :first-child h2{ position: sticky; top: 96px; }
@media (max-width: 800px){
  .two-col{ grid-template-columns: 1fr; gap: 16px; }
  .two-col > :first-child h2{ position: static; }
}

/* ---------- cards (lenses, projects) ---------- */
.card-grid{ display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; list-style: none; margin: 0; padding: 0; }
.card-grid.three{ grid-template-columns: repeat(3, minmax(0, 1fr)); }
@media (max-width: 900px){ .card-grid.three{ grid-template-columns: 1fr; } }
@media (max-width: 700px){ .card-grid{ grid-template-columns: 1fr; } }

.card{
  display: flex; flex-direction: column; gap: 8px; height: 100%;
  background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 24px; text-decoration: none; color: inherit;
  transition: border-color .15s ease, transform .15s ease, box-shadow .15s ease;
}
a.card:hover{ border-color: var(--accent); box-shadow: var(--shadow); transform: translateY(-2px); color: inherit; }
.card h3{ margin: 0; }
.card p{ margin: 0; font-size: 0.96rem; }
.card .more{ margin-top: auto; padding-top: 10px; font-size: 0.88rem; font-weight: 500; color: var(--accent); }
.card .num{ font-family: var(--mono); font-size: 0.75rem; color: var(--ink-faint); }
.card .chips{ margin-top: auto; padding-top: 12px; }

/* ---------- lists ---------- */
.plain-list{ margin: 0; padding: 0; list-style: none; }
.plain-list li{ padding: 16px 0; border-top: 1px solid var(--rule); color: var(--ink-soft); }
.plain-list li:last-child{ border-bottom: 1px solid var(--rule); }

/* ---------- timeline ---------- */
.timeline{ position: relative; margin: 0; padding: 0; }
.tl-item{ display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 28px; padding: 26px 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: 0.84rem; color: var(--ink-faint); padding-top: 3px; }
.tl-role{ font-family: var(--serif); font-size: 1.2rem; font-weight: 600; color: var(--ink); margin-bottom: 2px; line-height: 1.3; }
.tl-org{ color: var(--ink-faint); font-size: 0.93rem; margin-bottom: 12px; max-width: var(--measure); }
.tl-body p{ font-size: 0.98rem; }
.tl-body ul{ margin: 0; padding-left: 1.1em; max-width: var(--measure); }
.tl-body li{ margin-bottom: 0.5em; color: var(--ink-soft); font-size: 0.98rem; }
.tl-body li::marker{ color: var(--accent); }
.tl-sub{ font-family: var(--sans); font-size: 0.92rem; font-weight: 600; color: var(--ink); margin: 18px 0 6px; }
@media (max-width: 640px){ .tl-item{ grid-template-columns: 1fr; gap: 6px; } }

/* ---------- chips ---------- */
.tagset{ margin-bottom: 26px; }
.tagset h4{ font-family: var(--sans); font-size: 0.84rem; font-weight: 600; color: var(--ink); margin: 0 0 10px; }
.chips{ display: flex; flex-wrap: wrap; gap: 8px; }
.chip{
  font-size: 0.82rem; color: var(--ink-soft);
  background: var(--surface); border: 1px solid var(--rule);
  border-radius: 999px; padding: 4px 12px; line-height: 1.5;
}
.card .chip{ background: var(--surface-2); border-color: transparent; font-size: 0.76rem; }

/* ---------- publications ---------- */
.pub{ padding: 28px 0; border-top: 1px solid var(--rule); }
.pub:last-child{ border-bottom: 1px solid var(--rule); }
.pub-meta{ display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 10px; }
.pub-role, .pub-journal{
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.03em; text-transform: uppercase;
  padding: 3px 9px; border-radius: 999px;
}
.pub-role{ color: var(--marker); border: 1px solid color-mix(in srgb, var(--marker) 45%, transparent); }
.pub-journal{ color: var(--ink-faint); border: 1px solid var(--rule-strong); }
.pub h3{ margin-bottom: 8px; line-height: 1.3; }
.pub .cite{ font-size: 0.93rem; margin-bottom: 8px; }
.pub .cite .me{ color: var(--ink); font-weight: 600; }
.pub .finding{ font-size: 0.97rem; border-left: 3px solid var(--accent); padding-left: 14px; margin: 12px 0; }
.pub .doi{ font-family: var(--mono); font-size: 0.82rem; color: var(--ink-faint); margin: 0; }

/* ---------- pull quote ---------- */
.pull{
  font-family: var(--serif); font-size: clamp(1.3rem, 2.4vw, 1.65rem); line-height: 1.35;
  color: var(--ink); max-width: 40ch; margin: 0 0 24px;
  padding-left: 22px; border-left: 3px solid var(--marker);
}

/* ---------- buttons ---------- */
.btn{
  display: inline-flex; align-items: center; gap: 8px;
  font: 500 0.93rem var(--sans); text-decoration: none;
  color: var(--ink); background: var(--surface);
  border: 1px solid var(--rule-strong); border-radius: 8px;
  padding: 10px 16px; transition: background .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover{ border-color: var(--ink); color: var(--ink); }
.btn.primary{ background: var(--ink); border-color: var(--ink); color: var(--bg); }
.btn.primary:hover{ background: var(--accent-strong); border-color: var(--accent-strong); color: #fff; }
.btn.small{ padding: 6px 12px; font-size: 0.85rem; }
.btn .arrow{ transition: transform .15s ease; }
.btn:hover .arrow{ transform: translateX(3px); }

/* ---------- contact ---------- */
.contact-list{ list-style: none; margin: 0; padding: 0; }
.contact-list li{ display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: baseline; padding: 20px 0; border-top: 1px solid var(--rule); }
.contact-list li:last-child{ border-bottom: 1px solid var(--rule); }
.contact-list .label{ font-family: var(--mono); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--ink-faint); width: 100px; flex-shrink: 0; }
.contact-list a{ font-size: 1.08rem; overflow-wrap: anywhere; }

/* ---------- about narrative ---------- */
.narrative p{ font-size: 1.06rem; max-width: 68ch; }
.narrative .drop{ font-family: var(--serif); font-size: clamp(1.3rem, 2.2vw, 1.55rem); line-height: 1.4; color: var(--ink); }

/* ---------- notes ---------- */
.note{
  font-size: 0.9rem; color: var(--ink-soft);
  background: var(--surface-2); border-radius: 8px;
  padding: 12px 16px; margin: 18px 0 0; max-width: none;
}

/* ---------- footer ---------- */
.site-footer{ border-top: 1px solid var(--rule); padding: 36px 0 48px; font-size: 0.9rem; color: var(--ink-faint); }
.foot-row{ display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px; }
.foot-links{ display: flex; flex-wrap: wrap; gap: 6px 20px; list-style: none; margin: 0; padding: 0; }
.site-footer a{ color: var(--ink-faint); text-decoration: none; }
.site-footer a:hover{ color: var(--accent); }

/* ---------- 404 ---------- */
.center-page{ min-height: 60vh; display: grid; place-content: center; text-align: center; }
.center-page p{ margin-left: auto; margin-right: auto; }

@media print{
  .site-header, .site-footer, .actions, .nav-toggle{ display: none !important; }
  body{ background: #fff; color: #000; font-size: 11pt; }
  .section{ padding: 18px 0; }
  a{ color: #000; }
}