/* ============================================================
   Patrick Turley — personal academic site
   Palette: deep teal-blue accent on a warm off-white ground
   ============================================================ */

:root {
  --ink:        #1b2733;   /* primary text */
  --ink-soft:   #4a5765;   /* secondary text */
  --ink-faint:  #6b7785;   /* meta text */
  --accent:     #1f5673;   /* deep teal-blue */
  --accent-dark:#163f55;
  --accent-tint:#e8eff3;   /* subtle accent wash */
  --bg:         #fcfcfa;   /* page background */
  --bg-alt:     #f4f3ee;   /* alternating sections */
  --card:       #ffffff;
  --line:       #e2e0d9;   /* hairlines */
  --shadow:     0 1px 2px rgba(27, 39, 51, .06), 0 4px 16px rgba(27, 39, 51, .05);

  --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-sans:  "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  --maxw: 960px;
  --radius: 10px;
}

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

html { scroll-behavior: smooth; }
/* offset anchored sections so the sticky header doesn't overlap headings */
:target { scroll-margin-top: 84px; }
section[id] { scroll-margin-top: 84px; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}

h1, h2, h3 { font-family: var(--font-serif); line-height: 1.2; color: var(--ink); }
h2 { font-size: 1.75rem; margin: 0 0 1.25rem; }
h3 { font-size: 1.2rem; margin: 0 0 .5rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-dark); text-decoration: underline; }

p { margin: 0 0 1rem; }

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

.container { width: min(var(--maxw), 100% - 2.5rem); margin-inline: auto; }

/* ---------- Accessibility helpers ---------- */
.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: .6rem 1rem;
  border-radius: 0 0 var(--radius) 0;
  z-index: 200;
}
.skip-link:focus { left: 0; }

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

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(252, 252, 250, .92);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(var(--maxw), 100% - 2.5rem);
  margin-inline: auto;
  min-height: 60px;
}

.nav__brand {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--ink);
}
.nav__brand:hover { color: var(--accent); text-decoration: none; }

.nav__menu {
  list-style: none;
  display: flex;
  gap: 1.6rem;
  margin: 0;
  padding: 0;
}
.nav__menu a {
  color: var(--ink-soft);
  font-weight: 500;
  font-size: .98rem;
  padding: .35rem 0;
  border-bottom: 2px solid transparent;
}
.nav__menu a:hover { color: var(--accent); text-decoration: none; }
.nav__menu a.is-active { color: var(--accent); border-bottom-color: var(--accent); }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  padding: 8px;
  cursor: pointer;
}
.nav__toggle-bar {
  width: 24px;
  height: 2px;
  background: var(--ink);
  transition: transform .25s ease, opacity .25s ease;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: .95rem;
  line-height: 1.1;
  color: var(--accent);
  background: var(--card);
  border: 1px solid var(--line);
  padding: .6rem 1.05rem;
  border-radius: 999px;
  transition: background .15s ease, border-color .15s ease, color .15s ease, transform .05s ease;
}
.btn:hover { background: var(--accent-tint); border-color: var(--accent); color: var(--accent-dark); text-decoration: none; }
.btn:active { transform: translateY(1px); }

.btn--primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn--primary:hover { background: var(--accent-dark); border-color: var(--accent-dark); color: #fff; }

.btn--small { padding: .45rem .85rem; font-size: .88rem; }

/* ---------- Hero ---------- */
.hero { padding: 3.25rem 0 2.75rem; }
.hero__inner {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 2.75rem;
  align-items: center;
}
.hero__photo {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow);
  border: 4px solid #fff;
}
.hero__name { font-size: 2.5rem; margin: 0 0 .15rem; }
.hero__name span { color: var(--ink-faint); font-weight: 400; }
.hero__title {
  font-size: 1.2rem;
  color: var(--accent);
  font-weight: 600;
  margin: 0 0 .75rem;
}
.hero__affil {
  list-style: none;
  margin: 0 0 1.1rem;
  padding: 0;
  color: var(--ink-soft);
  font-size: .98rem;
}
.hero__affil li { padding: .1rem 0; }
.hero__bio { color: var(--ink-soft); max-width: 60ch; }

.actions { display: flex; flex-wrap: wrap; gap: .6rem; margin-top: 1.25rem; }

/* ---------- Sections ---------- */
.section { padding: 3rem 0; border-top: 1px solid var(--line); }
.section--alt { background: var(--bg-alt); }

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .75rem;
}
.section__head h2 { margin-bottom: 0; }

.subhead {
  margin: 2.25rem 0 1rem;
  font-size: 1.15rem;
  color: var(--ink);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
}

/* ---------- Research / Education ---------- */
.field-list {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--ink-soft);
}
.field-list li {
  margin-bottom: .4rem;
  padding-left: .25rem;
}
.field-list li::marker { color: var(--accent); }
.field-list li:last-child { margin-bottom: 0; }

.edu-list { list-style: none; margin: 0; padding: 0; }
.edu-list li { margin-bottom: 1.1rem; }
.edu-list li:last-child { margin-bottom: 0; }
.edu-degree { display: block; font-weight: 600; color: var(--ink); }
.edu-school { display: block; color: var(--ink-soft); }
.edu-note { display: block; color: var(--ink-faint); font-size: .9rem; }

/* ---------- Publications ---------- */
.pubs {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: none;
}
.pub {
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}
.pub:last-child { border-bottom: 0; }
.pub__title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.08rem;
  line-height: 1.35;
  color: var(--ink);
  margin: 0 0 .3rem;
}
.pub__meta {
  margin: 0;
  color: var(--ink-soft);
  font-size: .95rem;
}
.pub__meta em { color: var(--ink); font-style: italic; }

/* ---------- Teaching ---------- */
.teach-list { list-style: none; margin: 0; padding: 0; }
.teach-list li {
  padding: .9rem 0;
  border-bottom: 1px solid var(--line);
}
.teach-list li:last-child { border-bottom: 0; }
.teach-course { display: block; font-weight: 600; color: var(--ink); }
.teach-detail { display: block; color: var(--ink-soft); font-size: .95rem; }

/* ---------- Cards (software) ---------- */
.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.cards--3 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}
.card__title { color: var(--accent-dark); }
.card__desc { color: var(--ink-soft); font-size: .97rem; }

/* ---------- Contact ---------- */
.contact__lead { color: var(--ink-soft); }
.contact__address {
  font-style: normal;
  color: var(--ink-soft);
  line-height: 1.7;
  margin-top: 1.5rem;
  padding-left: 1rem;
  border-left: 3px solid var(--accent);
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.75rem 0;
  background: var(--bg);
}
.site-footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  color: var(--ink-faint);
  font-size: .9rem;
}
.site-footer__links { list-style: none; display: flex; gap: 1.25rem; margin: 0; padding: 0; }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 760px) {
  .nav__toggle { display: flex; }

  .nav__menu {
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    max-height: 0;
    overflow: hidden;
    transition: max-height .28s ease;
  }
  .nav__menu.is-open { max-height: 380px; }
  .nav__menu li { width: 100%; }
  .nav__menu a {
    display: block;
    padding: .9rem 1.25rem;
    width: min(var(--maxw), 100%);
    margin-inline: auto;
    border-bottom: 1px solid var(--line);
  }
  .nav__menu a.is-active { border-bottom-color: var(--line); }

  .hero { padding: 2.25rem 0 1.75rem; }
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 1.25rem;
    text-align: center;
    justify-items: center;
  }
  .hero__photo { width: 200px; height: 200px; }
  .hero__name { font-size: 2rem; }
  .hero__affil { font-size: .95rem; }
  .hero__bio { text-align: left; }
  .actions { justify-content: center; }

  .grid-2 { grid-template-columns: 1fr; gap: 2rem; }
  .cards { grid-template-columns: 1fr; }

  h2 { font-size: 1.5rem; }
  .section { padding: 2.25rem 0; }
}

@media (max-width: 400px) {
  body { font-size: 1rem; }
  .hero__name { font-size: 1.75rem; }
  .actions .btn { flex: 1 1 auto; text-align: center; }
}