/* ==========================================================
   Declan McGrath — personal site
   A quiet, book-like design: warm paper, ink text, one accent.
   ========================================================== */

:root {
  --paper: #faf7f2;
  --paper-raised: #ffffff;
  --ink: #1f1d1a;
  --ink-soft: #57534b;
  --ink-faint: #8a857b;
  --accent: #7d2e2b;         /* oxblood */
  --accent-soft: #a05550;
  --rule: #e4ddd2;
  --rule-strong: #cfc6b8;
  --max-width: 44rem;
  --serif: "Newsreader", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: "Inter", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #191714;
    --paper-raised: #211f1b;
    --ink: #e8e3da;
    --ink-soft: #b3ac9f;
    --ink-faint: #7d776c;
    --accent: #d08a80;
    --accent-soft: #b06f66;
    --rule: #35312b;
    --rule-strong: #4a453c;
  }
}

:root[data-theme="dark"] {
  --paper: #191714;
  --paper-raised: #211f1b;
  --ink: #e8e3da;
  --ink-soft: #b3ac9f;
  --ink-faint: #7d776c;
  --accent: #d08a80;
  --accent-soft: #b06f66;
  --rule: #35312b;
  --rule-strong: #4a453c;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.25s ease, color 0.25s ease;
}

::selection { background: var(--accent); color: var(--paper); }

/* ---------- layout ---------- */

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.4rem;
}

main.wrap { padding-top: 2.8rem; padding-bottom: 4.5rem; }

/* ---------- header / nav ---------- */

header {
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}

.header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  padding-top: 1.6rem;
  padding-bottom: 1.2rem;
}

.site-name {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--ink);
  text-decoration: none;
}
.site-name:hover { color: var(--accent); }

nav { display: flex; flex-wrap: wrap; gap: 1.15rem; }

nav a {
  font-family: var(--sans);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink-soft);
  text-decoration: none;
  padding-bottom: 0.15rem;
  border-bottom: 1.5px solid transparent;
}

nav a:hover { color: var(--accent); }
nav a.current { color: var(--ink); border-bottom-color: var(--accent); }

nav { align-items: center; }

.theme-toggle {
  font-size: 0.95rem;
  line-height: 1;
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--rule-strong);
  border-radius: 50%;
  color: var(--ink-soft);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }

/* ---------- typography ---------- */

h1 {
  font-size: 2.3rem;
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
}

h2 {
  font-size: 1.05rem;
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 2.8rem 0 1rem;
}

h2:first-child { margin-top: 0; }

h3 { font-size: 1.15rem; font-weight: 600; margin: 1.6rem 0 0.4rem; }

p { margin: 0 0 1rem; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

em { font-style: italic; }

hr { border: none; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

.lede {
  font-size: 1.15rem;
  color: var(--ink-soft);
  margin-bottom: 1.6rem;
}

.muted { color: var(--ink-faint); }
.small { font-size: 0.9rem; }

/* ---------- home page hero ---------- */

.hero {
  display: flex;
  gap: 2.2rem;
  align-items: flex-start;
  margin-bottom: 2.6rem;
}

.hero-text { flex: 1; min-width: 0; }

.hero .role {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin-bottom: 1.2rem;
}

.portrait {
  width: 180px;
  aspect-ratio: 3 / 4;
  height: auto;
  align-self: center;       /* sits centred against the text beside it */
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--rule-strong);
  flex-shrink: 0;
}

@media (max-width: 560px) {
  .hero { flex-direction: column-reverse; gap: 1.4rem; }
  .portrait {
    align-self: flex-start;
    width: 140px;
    aspect-ratio: 3 / 4;
    height: auto;
    margin-top: 0;
  }
  h1 { font-size: 1.9rem; }
}

/* ---------- contact row ---------- */

.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.4rem;
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
  font-family: var(--sans);
  font-size: 0.88rem;
}

.contact a { color: var(--ink-soft); }
.contact a:hover { color: var(--accent); text-decoration: none; }
.contact .label { color: var(--ink-faint); margin-right: 0.3rem; }

/* ---------- entry lists (papers, notes, teaching) ---------- */

.entry {
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--rule);
}
.entry:last-child { border-bottom: none; }

.entry .title { font-weight: 600; font-size: 1.08rem; }
.entry .meta {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin-top: 0.15rem;
}
.entry .desc { margin-top: 0.45rem; margin-bottom: 0; color: var(--ink-soft); }

.entry .links {
  font-family: var(--sans);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}
.entry .links a { margin-right: 1rem; }

/* ---------- collapsible abstract ---------- */

details.abstract { margin-top: 0.5rem; }
details.abstract summary {
  font-family: var(--sans);
  font-size: 0.85rem;
  color: var(--accent);
  cursor: pointer;
  user-select: none;
  width: fit-content;
}
details.abstract summary:hover { text-decoration: underline; text-underline-offset: 3px; }
details.abstract[open] summary { margin-bottom: 0.45rem; }
details.abstract .desc { margin-top: 0; }
sup, sub { line-height: 0; }

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--rule);
  padding: 1.6rem 0 2.4rem;
}

footer .wrap {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-faint);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

footer a { color: var(--ink-faint); }
footer a:hover { color: var(--accent); }