/* AIXLab@Chalmers - modern overrides on top of Beautiful Jekyll.
   Loaded via `site-css` in _config.yml, after beautifuljekyll.css. */

:root {
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --text: #1F2937;
  --text-muted: #6B7280;
  --brand: #0F766E;
  --brand-dark: #0B5752;
  --accent: #D97757;
  --accent-dark: #B8613F;
  --accent-soft: #FDECE3;
  --border: #E5E7EB;
  --radius: 12px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-md: 0 1px 2px rgba(15, 23, 42, .06), 0 8px 24px -12px rgba(15, 23, 42, .12);
  --shadow-lg: 0 6px 16px -8px rgba(15, 23, 42, .12), 0 20px 40px -20px rgba(15, 23, 42, .18);
  --max-w: 1120px;
}

/* --- Typography --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Instrument+Serif:ital@0;1&display=swap');

html, body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Instrument Serif', Georgia, serif;
  color: var(--text);
  font-weight: 400;
  letter-spacing: -0.01em;
}
h1 { font-size: 2.1rem; line-height: 1.2; }
h2 { font-size: 1.55rem; line-height: 1.3; margin-top: 2rem; }
h3 { font-size: 1.2rem; line-height: 1.35; }
h4 { font-size: 1.05rem; }

a { color: var(--brand); text-decoration: none; transition: color .15s ease; }
a:hover, a:focus { color: var(--accent); text-decoration: underline; }

p { margin-bottom: 1rem; }

/* --- Navbar --- */
/* Pin height at all scroll positions + viewports so it doesn't resize between pages.
   Beautiful Jekyll otherwise expands padding to 1.25rem on >=1200px until you
   scroll past 50px, which made the navbar "jump" when navigating between tabs. */
.navbar-custom,
.navbar-custom.top-nav-short,
.navbar-custom.top-nav-regular,
.navbar-custom.top-nav-short-permanent {
  background: var(--brand) !important;
  border-bottom: 1px solid rgba(255, 255, 255, .08);
  box-shadow: 0 1px 0 rgba(15, 23, 42, .04);
  padding-top: 0 !important;
  padding-bottom: 0 !important;
  transition: none;
}
.navbar-custom .navbar-brand,
.navbar-custom .nav li a { color: #fff !important; font-weight: 500; letter-spacing: 0.01em; }
.navbar-custom .nav li a:hover { background: rgba(255, 255, 255, .08) !important; color: #fff !important; }
.navbar-custom .navbar-toggler { color: #fff; border-color: rgba(255, 255, 255, .4); }

@media (min-width: 1200px) {
  .navbar-custom,
  .navbar-custom.top-nav-short,
  .navbar-custom.top-nav-regular,
  .navbar-custom.top-nav-short-permanent {
    padding-top: 0 !important;
    padding-bottom: 0 !important;
  }
  .navbar-custom .navbar-brand-logo img,
  .navbar-custom.top-nav-short .navbar-brand-logo img {
    height: 2.5rem;
  }
}

/* --- Page intro (Beautiful Jekyll's header) --- */
.intro-header {
  background: linear-gradient(180deg, #F3EFE9 0%, var(--bg) 100%) !important;
  border-bottom: 1px solid var(--border);
  padding-top: 2rem;
  padding-bottom: 2rem;
}
.intro-header .page-heading h1 {
  font-size: 2.2rem;
  color: var(--text);
}
.intro-header .page-heading .page-subheading {
  color: var(--text-muted);
  font-family: 'Inter', sans-serif;
  font-style: normal;
  font-size: 1.02rem;
  margin-top: .2rem;
}

/* --- Footer --- */
footer {
  background: #F3EFE9 !important;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}
footer a { color: var(--brand); }

/* --- Container width --- */
.container, .container-fluid { max-width: var(--max-w); }
.col-xl-8.offset-xl-2 { max-width: 820px; }

/* --- Cards, pills, badges --- */
.aix-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.aix-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #D6DDE4;
}

.aix-pill {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: .78rem;
  font-weight: 500;
  line-height: 1.4;
  background: var(--accent-soft);
  color: var(--accent-dark);
  border: 1px solid rgba(217, 119, 87, .25);
}
.aix-pill--brand { background: rgba(15, 118, 110, .10); color: var(--brand-dark); border-color: rgba(15, 118, 110, .25); }
.aix-pill--muted { background: #F3F4F6; color: var(--text-muted); border-color: var(--border); }
.aix-pill--warn { background: #FEF3C7; color: #92400E; border-color: #FDE68A; }

/* --- Home hero --- */
.aix-hero {
  padding: 3rem 0 2.5rem;
}
.aix-hero__eyebrow {
  display: inline-block;
  font-size: .82rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--accent-dark);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 1rem;
}
.aix-hero__title {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: clamp(1.15rem, 2.5vw, 1.7rem);
  line-height: 1.2;
  margin: 0 0 1rem;
  color: var(--text);
  letter-spacing: -0.01em;
  white-space: nowrap;
}
@media (max-width: 640px) {
  .aix-hero__title { white-space: normal; font-size: 1.4rem; }
}
.aix-hero__title em { font-style: italic; color: var(--accent); }
.aix-hero__lede {
  font-size: 1.08rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* --- LEAST feature grid --- */
.aix-least {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: .75rem;
  margin: 2rem 0 3rem;
}
.aix-least__item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem .9rem;
  box-shadow: var(--shadow-sm);
  min-width: 0;
}
.aix-least__letter {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 2rem;
  line-height: 1;
  color: var(--accent);
  margin-bottom: .2rem;
}
.aix-least__word {
  font-weight: 600;
  margin-bottom: .35rem;
  color: var(--text);
  font-size: .95rem;
}
.aix-least__desc { font-size: .82rem; color: var(--text-muted); line-height: 1.45; }

@media (max-width: 900px) {
  .aix-least { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .aix-least { grid-template-columns: 1fr; }
}

/* --- Section labels --- */
.aix-section-label {
  font-family: 'Inter', sans-serif;
  font-size: .82rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--brand);
  margin-top: 2.5rem;
  margin-bottom: .5rem;
}
.aix-section-title {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 1.6rem;
  margin: 0 0 1.25rem;
  color: var(--text);
}

/* --- Team grid --- */
.aix-team-group {
  margin-top: 2rem;
}
.aix-team-group__heading {
  font-family: 'Inter', sans-serif;
  font-weight: 600;
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  margin-bottom: 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
}
.aix-team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 1rem;
}
.aix-member-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform .18s ease, box-shadow .18s ease;
}
.aix-member-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.aix-member-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 10px;
  display: block;
}
.aix-member-card__name {
  margin-top: .85rem;
  font-weight: 600;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  line-height: 1.3;
}
.aix-member-card__name a { color: var(--text); border-bottom: 1px dashed transparent; }
.aix-member-card__name a:hover { color: var(--accent); text-decoration: none; border-bottom-color: var(--accent); }
.aix-member-card__role {
  color: var(--text-muted);
  font-size: .92rem;
  margin-top: .25rem;
}
.aix-member-card__tag {
  display: inline-block;
  margin-top: .4rem;
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--accent-dark);
  background: var(--accent-soft);
  padding: 2px 8px;
  border-radius: 999px;
}

.aix-team-group--alumni .aix-member-card { opacity: .85; }

/* --- Project + publication cards --- */
.aix-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1rem;
}
.aix-project-card .aix-project-card__title {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 1.35rem;
  line-height: 1.25;
  margin: 0 0 .5rem;
  color: var(--text);
}
.aix-project-card__meta {
  color: var(--text-muted);
  font-size: .9rem;
  margin-bottom: .75rem;
}
.aix-project-card__meta strong { color: var(--text); font-weight: 600; }
.aix-project-card__desc { font-size: .98rem; color: var(--text); }
.aix-project-card__tags { margin-top: .75rem; display: flex; flex-wrap: wrap; gap: .35rem; }

.aix-pub {
  border-bottom: 1px solid var(--border);
  padding: 1.1rem 0;
}
.aix-pub:last-child { border-bottom: none; }
.aix-pub__title {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 1.15rem;
  line-height: 1.3;
  color: var(--text);
  margin: 0 0 .35rem;
}
.aix-pub__title a { color: var(--text); }
.aix-pub__title a:hover { color: var(--accent); text-decoration: none; }
.aix-pub__authors { color: var(--text-muted); font-size: .95rem; line-height: 1.5; }
.aix-pub__authors .aix-pub__member { color: var(--text); font-weight: 600; }
.aix-pub__venue {
  color: var(--text-muted);
  font-size: .92rem;
  font-style: italic;
  margin-top: .2rem;
}
.aix-pub__meta { margin-top: .5rem; display: flex; flex-wrap: wrap; gap: .35rem; align-items: center; }
.aix-pub__links { margin-top: .5rem; display: flex; flex-wrap: wrap; gap: .75rem; font-size: .9rem; }

/* --- Filter bar --- */
.aix-filters {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1rem 0 2rem;
  box-shadow: var(--shadow-sm);
}
.aix-filter-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  padding: .25rem 0;
}
.aix-filter-row__label {
  font-size: .82rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--text-muted);
  min-width: 72px;
  margin-right: .25rem;
}
.aix-chip {
  background: #F3F4F6;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: .85rem;
  cursor: pointer;
  transition: all .15s ease;
}
.aix-chip:hover { background: #E5E7EB; }
.aix-chip.is-active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.aix-search {
  width: 100%;
  padding: .55rem .9rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: .95rem;
  background: #F9FAFB;
  transition: border-color .15s ease, background .15s ease;
}
.aix-search:focus {
  border-color: var(--brand);
  background: #fff;
  outline: none;
  box-shadow: 0 0 0 3px rgba(15, 118, 110, .1);
}

/* --- Year heading for publications --- */
.aix-year {
  font-family: 'Instrument Serif', Georgia, serif;
  font-size: 1.9rem;
  color: var(--accent);
  margin: 2rem 0 .5rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: .3rem;
}

/* --- Empty / no-results state --- */
.aix-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 3rem 1rem;
  font-style: italic;
}

/* --- Opportunities --- */
.aix-opportunity {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: .75rem 1.1rem;
  margin-bottom: .5rem;
  box-shadow: var(--shadow-sm);
}
.aix-opportunity p { margin: 0; }
.aix-opportunity p + p { margin-top: .2rem; }
.aix-opportunity--split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: .75rem 1.25rem;
}
.aix-opportunity__col { min-width: 0; }
.aix-opportunity__col--action {
  justify-self: end;
  white-space: nowrap;
  font-size: .9rem;
}
.aix-opportunity__col--action a { color: var(--text-muted); text-decoration: underline; }
.aix-opportunity__col--action a:hover { color: var(--brand); }
@media (max-width: 640px) {
  .aix-opportunity--split { grid-template-columns: 1fr; }
  .aix-opportunity__col--action { justify-self: start; }
}
.aix-opportunity__title {
  font-weight: 600;
  color: var(--text);
  font-size: .98rem;
  line-height: 1.35;
}
.aix-opportunity__meta {
  font-size: .82rem;
  color: var(--text-muted);
  letter-spacing: .01em;
}
.aix-opportunity__subtitle {
  color: var(--text-muted);
  font-size: .88rem;
  line-height: 1.4;
}
.aix-opportunity__contact {
  font-size: .88rem;
  color: var(--text-muted);
}
.aix-opportunity__contact a {
  color: var(--accent);
  font-weight: 500;
  word-break: break-word;
}
.aix-opportunity__contact a:hover { color: var(--accent-dark); text-decoration: underline; }
.aix-opportunity--past { opacity: .8; }
.aix-opportunity--past .aix-opportunity__contact a {
  color: var(--text-muted);
  font-weight: 400;
  text-decoration: underline;
}
.aix-opportunity--past .aix-opportunity__contact a:hover { color: var(--brand); }

/* --- Responsive tweaks --- */
@media (max-width: 768px) {
  html, body { font-size: 16px; }
  .aix-hero__title { white-space: normal; }
  .aix-hero__lede { font-size: 1rem; }
  .intro-header .page-heading h1 { font-size: 1.7rem; }
  .aix-team-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .aix-member-card img { height: 180px; }
  .aix-grid { grid-template-columns: 1fr; }
}