/* =============================================================
   Arash Parsa — personal site
   Palette: deep navy ink + microscopy-teal accent on white.
   Type: Source Serif 4 (scholarly display) / Inter (body/UI) /
         JetBrains Mono (technical eyebrow labels & metrics).
   ============================================================= */

:root {
  --ink:        #16283f;   /* nav brand, headings */
  --ink-soft:   #24374f;
  --teal:       #2f7d8c;   /* links, active tab, accent */
  --teal-deep:  #235f6b;
  --text:       #2b3340;   /* body copy */
  --muted:      #6b7480;   /* meta, captions */
  --line:       #e6e9ef;   /* hairlines */
  --line-soft:  #eef1f5;
  --bg:         #ffffff;
  --panel:      #f6f8fa;   /* alternate panel */
  --tag-bg:     #eef4f5;   /* skill/tech chips */
  --tag-text:   #235f6b;

  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans:  "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  --wrap: 860px;
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--teal); text-decoration: none; }
a:hover { color: var(--teal-deep); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- layout helpers ---------- */
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--teal-deep);
  margin: 0 0 10px;
}

/* ---------- top nav ---------- */
.site-nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--wrap);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.brand {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 20px;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.brand:hover { color: var(--ink); text-decoration: none; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tabs a {
  font-size: 14.5px;
  color: var(--ink-soft);
  padding: 6px 12px;
  border-radius: 6px;
  position: relative;
}
.tabs a:hover { color: var(--teal-deep); background: var(--panel); text-decoration: none; }
.tabs a.active { color: var(--teal-deep); font-weight: 600; }
.tabs a.active::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 0;
  height: 2px; background: var(--teal); border-radius: 2px;
}

/* ---------- hero (about) ---------- */
.hero { padding: 56px 0 40px; }
.hero-grid {
  display: grid;
  grid-template-columns: 1fr 210px;
  gap: 40px;
  align-items: start;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 42px;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0 0 8px;
}
.hero .tagline {
  font-size: 17px;
  color: var(--muted);
  margin: 0 0 22px;
}
.hero p { margin: 0 0 16px; }

/* headshot / monogram */
.portrait {
  width: 210px; height: 210px;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: 0 12px 30px -18px rgba(22,40,63,0.45);
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.monogram {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(150deg, var(--ink) 0%, var(--teal-deep) 100%);
  color: #fff;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 66px;
  letter-spacing: 0.02em;
}
.portrait-cap {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--muted);
  text-align: center;
  margin-top: 10px;
  letter-spacing: 0.04em;
}

/* social row */
.social { display: flex; gap: 14px; margin-top: 22px; flex-wrap: wrap; }
.social a {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 14px; color: var(--ink-soft);
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.social a:hover { color: var(--teal-deep); border-color: var(--teal); background: var(--panel); text-decoration: none; }
.social svg { width: 16px; height: 16px; }

/* ---------- generic section ---------- */
.section { padding: 44px 0; border-top: 1px solid var(--line-soft); }
.page-head { padding: 52px 0 8px; }
.page-head h1 {
  font-family: var(--serif); font-weight: 600;
  font-size: 34px; letter-spacing: -0.02em; color: var(--ink); margin: 0;
}
.page-head p { color: var(--muted); margin: 10px 0 0; max-width: 60ch; }

h2.section-title {
  font-family: var(--serif); font-weight: 600;
  font-size: 24px; color: var(--ink); letter-spacing: -0.01em;
  margin: 0 0 22px;
}

/* ---------- highlights (news) ---------- */
.highlights { list-style: none; margin: 0; padding: 0; }
.highlights li {
  display: grid; grid-template-columns: 92px 1fr; gap: 16px;
  padding: 12px 0; border-bottom: 1px solid var(--line-soft);
}
.highlights li:last-child { border-bottom: 0; }
.highlights .when {
  font-family: var(--mono); font-size: 12.5px; color: var(--teal-deep);
  padding-top: 2px; letter-spacing: 0.02em;
}

/* ---------- publications ---------- */
.pub {
  border-left: 3px solid var(--teal);
  background: var(--panel);
  border-radius: 0 10px 10px 0;
  padding: 18px 20px;
  margin-bottom: 16px;
}
.pub h3 {
  font-family: var(--serif); font-weight: 600;
  font-size: 18.5px; line-height: 1.3; color: var(--ink);
  margin: 0 0 8px;
}
.pub .venue { font-size: 14.5px; color: var(--text); margin: 0 0 8px; }
.pub .status {
  display: inline-block;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--tag-text); background: var(--tag-bg);
  padding: 3px 9px; border-radius: 20px;
}

/* ---------- projects ---------- */
.project {
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}
.project:last-child { border-bottom: 0; }
.project-top { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.project h3 {
  font-family: var(--serif); font-weight: 600;
  font-size: 20px; color: var(--ink); margin: 0 0 4px;
}
.project .meta { font-family: var(--mono); font-size: 12px; color: var(--muted); white-space: nowrap; }
.project p { margin: 8px 0 12px; }
.tags { display: flex; flex-wrap: wrap; gap: 7px; }
.tag {
  font-family: var(--mono); font-size: 11.5px;
  color: var(--tag-text); background: var(--tag-bg);
  padding: 3px 9px; border-radius: 6px;
}
.project-links { margin: 12px 0 0; }
.repo-link {
  display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--mono); font-size: 12.5px; font-weight: 500;
  color: var(--teal);
}
.repo-link svg { width: 15px; height: 15px; fill: currentColor; }
.repo-link:hover { color: var(--teal-deep); text-decoration: none; }
.repo-link .arrow { transition: transform .15s ease; }
.repo-link:hover .arrow { transform: translateX(3px); }

/* ---------- CV / timeline ---------- */
.cv-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 4px 0 8px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14.5px; font-weight: 500;
  color: #fff; background: var(--ink);
  padding: 10px 16px; border-radius: 8px;
  border: 1px solid var(--ink);
  transition: background .15s ease, transform .15s ease;
}
.btn:hover { background: var(--teal-deep); border-color: var(--teal-deep); color: #fff; text-decoration: none; }
.btn.ghost { background: transparent; color: var(--ink); }
.btn.ghost:hover { background: var(--panel); color: var(--teal-deep); }
.btn svg { width: 15px; height: 15px; }

.role {
  display: grid; grid-template-columns: 150px 1fr; gap: 20px;
  padding: 20px 0; border-bottom: 1px solid var(--line-soft);
}
.role:last-child { border-bottom: 0; }
.role .when { font-family: var(--mono); font-size: 12.5px; color: var(--muted); padding-top: 3px; }
.role h3 { font-size: 17.5px; color: var(--ink); margin: 0 0 2px; font-weight: 600; }
.role .org { color: var(--teal-deep); font-size: 14.5px; margin: 0 0 8px; }
.role ul { margin: 0; padding-left: 18px; }
.role li { margin: 4px 0; font-size: 15px; }

/* skills grid */
.skills { display: grid; grid-template-columns: repeat(2, 1fr); gap: 4px 32px; }
.skill-row { padding: 9px 0; border-bottom: 1px solid var(--line-soft); }
.skill-row .k { font-family: var(--mono); font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.06em; color: var(--teal-deep); display: block; margin-bottom: 3px; }
.skill-row .v { font-size: 14px; color: var(--text); }

/* ---------- footer ---------- */
.site-foot {
  border-top: 1px solid var(--line);
  padding: 28px 0 40px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 13.5px;
}
.foot-inner { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: center; }
.foot-inner a { color: var(--muted); }
.foot-inner a:hover { color: var(--teal-deep); }

/* ---------- cascade signature glyph ---------- */
.cascade { margin-top: 26px; opacity: 0.9; }

/* ---------- entrance motion ---------- */
.fade { opacity: 0; transform: translateY(8px); animation: rise .6s ease forwards; }
.fade.d1 { animation-delay: .05s; }
.fade.d2 { animation-delay: .12s; }
.fade.d3 { animation-delay: .19s; }
@keyframes rise { to { opacity: 1; transform: none; } }

/* ---------- responsive ---------- */
@media (max-width: 680px) {
  body { font-size: 16px; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero { padding: 40px 0 28px; }
  .hero h1 { font-size: 34px; }
  .portrait { width: 150px; height: 150px; order: -1; }
  .monogram { font-size: 48px; }
  .highlights li { grid-template-columns: 1fr; gap: 2px; }
  .highlights .when { padding-top: 0; }
  .role { grid-template-columns: 1fr; gap: 6px; }
  .role .when { padding-top: 0; }
  .skills { grid-template-columns: 1fr; }
  .nav-inner { padding: 12px 20px; }
  .brand { font-size: 18px; }
}

/* ---------- accessibility ---------- */
a:focus-visible, .btn:focus-visible, .tabs a:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 2px;
  border-radius: 4px;
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .fade { animation: none; opacity: 1; transform: none; }
}