/* ============================================================
   Vasilis Niarchos — academic homepage
   Design tokens
   -------------------------------------------------------------
   paper      #F7F8FA  cool near-white background
   ink        #1A1D23  primary text
   ink-soft   #4B5160  secondary text / meta
   rule       #DDE1E7  hairline dividers
   accent     #2E5C8A  blue — links, active nav, publication titles
   accent-2   #2F7A5C  green — signature motif + section eyebrows
   accent-3   #B0501F  rust/orange — project names + subsection titles
   (nod to the old site's color-coded text: names, titles, and links
   each got their own hue there — blue titles, maroon names, orange
   links, green asides)
   ============================================================ */

:root {
  --paper: #F7F8FA;
  --paper-raised: #FFFFFF;
  --ink: #1A1D23;
  --ink-soft: #4B5160;
  --ink-faint: #7C8494;
  --rule: #DDE1E7;
  --accent: #2E5C8A;
  --accent-soft: #E4EBF3;
  --accent-2: #2F7A5C;
  --accent-2-soft: #E1F0E8;
  --accent-3: #B0501F;
  --accent-3-soft: #F5E4D6;
  --measure: 42rem;
  --font-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}

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

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}
a:hover { color: var(--accent-2); }

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

.layout {
  max-width: 76rem;
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 15rem minmax(0, 1fr);
  gap: 3.5rem;
  min-height: 100vh;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
    gap: 0;
  }
}

/* ---------- Sidebar ---------- */

.sidebar {
  padding: 3rem 1.75rem 2rem;
  background: var(--accent-soft);
  border-right: 1px solid var(--rule);
}

@media (max-width: 860px) {
  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--rule);
    padding: 2rem 1.5rem 1.5rem;
  }
}

.mark {
  display: block;
  margin-bottom: 1.75rem;
  color: var(--accent-2);
}

.site-name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--ink);
  text-decoration: none;
  display: block;
}
.site-name:hover { color: var(--ink); }

.site-role {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.85rem;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  letter-spacing: 0.01em;
}

.nav {
  margin-top: 2.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

@media (max-width: 860px) {
  .nav {
    margin-top: 1.25rem;
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0.25rem 1rem;
  }
}

.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 0.95rem;
  padding: 0.4rem 0.6rem;
  margin-left: -0.6rem;
  border-radius: 4px;
  transition: background 0.15s ease, color 0.15s ease;
}
.nav a:hover { background: rgba(255, 255, 255, 0.7); color: var(--ink); }
.nav a[aria-current="page"] {
  background: var(--paper-raised);
  color: var(--accent);
  font-weight: 600;
}

.sidebar-foot {
  margin-top: 2.5rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.sidebar-foot a { color: var(--ink-faint); }
.sidebar-foot a:hover { color: var(--accent); }

@media (max-width: 860px) { .sidebar-foot { display: none; } }

/* ---------- Main content ---------- */

main {
  padding: 3rem 0 4rem;
  max-width: var(--measure);
}

@media (max-width: 860px) { main { padding: 2rem 0 3rem; } }

h1.page-title {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 1.5rem;
}

/* ---------- Hero (home page) ---------- */

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 15rem;
  align-items: start;
  gap: 1rem;
  margin-bottom: 3rem;
  isolation: isolate;
}

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; }
}

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

.hero-title {
  font-size: 2.6rem;
  margin-bottom: 0.4rem;
  animation: rise 0.5s ease both;
}

.hero-affiliation {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin: 0 0 1.75rem;
}

.hero-motif {
  position: relative;
  width: 19rem;
  height: 19rem;
  margin: -2rem -3rem 0 0;
  color: var(--accent-2);
  opacity: 0.48;
  overflow: hidden;
  border-radius: 50%;
  mask-image: radial-gradient(circle, #000 58%, transparent 100%);
  animation: fade-in 0.9s ease both;
}
.hero-motif svg { width: 100%; height: 100%; }

@media (max-width: 860px) {
  .hero-motif {
    position: absolute;
    right: -3rem;
    top: -1rem;
    width: 11rem;
    height: 11rem;
    margin: 0;
    opacity: 0.22;
    z-index: -1;
  }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fade-in {
  from { opacity: 0; }
  to { opacity: 0.28; }
}

.lede {
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--ink-soft);
  margin: 0 0 2.5rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-2);
  margin: 0 0 0.6rem;
}

section.block { margin-bottom: 2.75rem; }

h2.section-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 600;
  margin: 0 0 1rem;
}

h3.subsection-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin: 1.75rem 0 0.9rem;
  color: var(--accent-3);
}

p { margin: 0 0 1rem; }

ul.plain, ol.plain {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* research topics tag list */
.topics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0 0 0.5rem;
  padding: 0;
  list-style: none;
}
.topics li {
  font-size: 0.86rem;
  font-family: var(--font-mono);
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.3rem 0.75rem;
  transition: border-color 0.15s ease;
}
.topics li:nth-child(3n+2) { color: var(--accent-2); background: var(--accent-2-soft); }
.topics li:nth-child(3n+3) { color: var(--accent-3); background: var(--accent-3-soft); }
.topics li:hover { border-color: currentColor; }

/* project cards */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(15.5rem, 1fr));
  gap: 1rem;
}

.project {
  padding: 1.15rem 1.2rem 1.3rem;
  border: 1px solid var(--rule);
  border-radius: 10px;
  background: var(--paper-raised);
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}
.project:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow: 0 6px 18px -12px rgba(26, 29, 35, 0.35);
}
.project-name { font-weight: 600; color: var(--accent-3); }
.project-desc { color: var(--ink-soft); font-size: 0.95rem; margin-top: 0.4rem; }
.project-links { margin-top: 0.7rem; font-size: 0.85rem; font-family: var(--font-mono); }
.project-links a { margin-right: 1rem; }

/* publications */
ol.pubs { counter-reset: pub; padding: 0; margin: 0; list-style: none; }
ol.pubs li {
  counter-increment: pub;
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 0.75rem;
  padding: 0.9rem 0.6rem;
  margin: 0 -0.6rem;
  border-top: 1px solid var(--rule);
  border-radius: 6px;
  transition: background 0.15s ease;
}
ol.pubs li:first-child { border-top: none; }
ol.pubs li:hover { background: var(--accent-soft); }
ol.pubs li::before {
  content: counter(pub);
  font-family: var(--font-mono);
  color: var(--ink-faint);
  font-size: 0.85rem;
  padding-top: 0.15rem;
}
.pub-title { font-weight: 500; color: var(--accent); }
.pub-meta { color: var(--ink); font-size: 0.92rem; margin-top: 0.2rem; }
.pub-tag {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--accent);
}

/* simple lists (teaching, outreach, workshops, preprint servers) */
ul.entries { list-style: none; margin: 0; padding: 0; }
ul.entries li {
  padding: 0.55rem 0;
  font-size: 0.86rem;
  color: var(--ink-soft);
  border-top: 1px solid var(--rule);
}
ul.entries li:first-child { border-top: none; }
ul.entries li.nested { padding-left: 1rem; font-size: 0.82rem; }
ul.entries .pub-title { font-size: 0.86rem; }
ul.entries .pub-meta { font-size: 0.8rem; margin-top: 0.15rem; }
ul.entries .pub-tag { font-size: 0.78rem; margin-top: 0.15rem; }

.note {
  font-size: 0.9rem;
  color: var(--ink-faint);
  border-left: 2px solid var(--rule);
  padding-left: 0.85rem;
  margin-top: 0.5rem;
}

footer.page-foot {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-size: 0.85rem;
  color: var(--ink-faint);
}