/* ==========================================================================
   Site overrides on top of Beautiful Jekyll: minimal look, dark mode,
   mobile fixes, and the profile home page. Loaded via `site-css` in
   _config.yml, after beautifuljekyll.css.
   ========================================================================== */

@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Source+Serif+4:opsz,wght@8..60,600&display=swap");

/* ---------- Colour tokens ---------- */
:root {
  color-scheme: light;
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5d6670;
  --heading: #0f1419;
  --border: #e3e6ea;
  --accent: #1d5fd1;
  --accent-hover: #164aa6;
  --accent-soft: rgba(29, 95, 209, 0.09);
  --nav-bg: rgba(255, 255, 255, 0.86);
  --code-bg: #f3f4f6;
  --shadow: 0 1px 2px rgba(15, 20, 25, 0.04), 0 4px 16px rgba(15, 20, 25, 0.05);
  --radius: 12px;
  --bg-image-opacity: 0.05;
  --bg-image-filter: invert(1);
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Source Serif 4", Georgia, "Times New Roman", serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #0f1216;
    --bg-alt: #151a20;
    --surface: #161b22;
    --text: #d6dbe1;
    --muted: #949ea9;
    --heading: #f1f4f7;
    --border: #262d36;
    --accent: #79a8ff;
    --accent-hover: #a3c3ff;
    --accent-soft: rgba(121, 168, 255, 0.12);
    --nav-bg: rgba(15, 18, 22, 0.86);
    --code-bg: #1b2129;
    --shadow: none;
    --bg-image-opacity: 0.12;
    --bg-image-filter: none;
  }
}

/* ---------- Base typography ---------- */
html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--text);
  background-color: var(--bg);
  background-image: none;
}

p { line-height: 1.7; margin: 1.1rem 0; }

/* Faint background on every page: Webb's NIRCam image of star cluster
   Pismis 24 (NASA, ESA, CSA, STScI, CC BY 4.0; credit in the footer).
   Dark mode: faint galaxies on black. Light mode: inverted, even fainter. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: url("/assets/img/bg-webb-pismis24.jpg") center / cover no-repeat;
  opacity: var(--bg-image-opacity);
  filter: var(--bg-image-filter);
}
@media (orientation: portrait) {
  body::before { background-image: url("/assets/img/bg-webb-pismis24-tall.jpg"); }
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--heading);
  letter-spacing: -0.01em;
  line-height: 1.25;
}
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.05rem; }

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

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

blockquote { color: var(--muted); border-left: 3px solid var(--border); padding-left: 1rem; }
hr { border-color: var(--border); }

/* Images: never overflow; ignore odd height="70%" attributes */
[role="main"] img { max-width: 100%; height: auto; }

/* ---------- Navbar ---------- */
.navbar-custom {
  background: var(--nav-bg);
  background-image: none;
  border-bottom: 1px solid var(--border);
  font-family: var(--font-sans);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  backdrop-filter: saturate(180%) blur(10px);
}
.navbar-custom .navbar-brand,
.navbar-custom .navbar-nav .nav-link {
  color: var(--heading);
  font-weight: 600;
}
.navbar-custom .navbar-brand { font-size: 1.05rem; letter-spacing: -0.01em; }
.navbar-custom .navbar-nav .nav-item {
  text-transform: none;
  font-size: 0.95rem;
  letter-spacing: 0;
}
.navbar-custom .navbar-nav .nav-link:hover,
.navbar-custom .navbar-nav .nav-link:focus { color: var(--accent); text-decoration: none; }
.navbar-custom .nav-item.dropdown .dropdown-menu { background: var(--surface); border: 1px solid var(--border); }
.navbar-custom .nav-item.dropdown .dropdown-menu .dropdown-item { color: var(--text); }
.navbar-custom .navbar-toggler { border-color: var(--border); }
@media (prefers-color-scheme: dark) {
  .navbar-custom .navbar-toggler-icon { filter: invert(1); }
}
@media (max-width: 1199px) {
  /* Comfortable tap targets in the collapsed mobile menu */
  .navbar-custom .navbar-nav .nav-link { padding-top: 0.75rem; padding-bottom: 0.75rem; }
}

/* ---------- Page / post headers ---------- */
.intro-header .page-heading h1,
.intro-header .post-heading h1 { font-size: 2.25rem; font-weight: 700; }
.intro-header .page-heading .page-subheading,
.intro-header .post-heading .post-subheading {
  font-family: var(--font-sans);
  font-weight: 400;
  color: var(--muted);
}
.intro-header .page-heading hr.small { display: none; }
.intro-header:not(.big-img) .post-heading .post-meta { color: var(--muted); }
@media (max-width: 767px) {
  .intro-header .page-heading h1,
  .intro-header .post-heading h1 { font-size: 1.75rem; }
}

/* ---------- Blog feed ---------- */
.post-preview { border-bottom: 1px solid var(--border); }
.post-preview a, .post-preview .post-title { color: var(--heading); }
.post-preview a:hover { color: var(--accent); text-decoration: none; }
.post-preview .post-subtitle,
.post-preview .post-meta,
.post-preview .post-entry { color: var(--muted); }
.post-preview .post-title { font-size: 1.5rem; }

.blog-tags a, .blog-tags span { color: var(--accent); border-color: var(--accent); }
.blog-tags a:hover { background-color: var(--accent-soft); color: var(--accent); }

.pagination .page-item .page-link { background: var(--surface); color: var(--heading); border-color: var(--border); }

/* ---------- Boxes, code, tables ---------- */
.box-note, .box-warning, .box-error, .box-success {
  border-radius: 8px;
  border-left-width: 4px;
}
@media (prefers-color-scheme: dark) {
  .box-note    { background-color: #12233d; border-left-color: #4f82d6; color: var(--text); }
  .box-warning { background-color: #2e2612; border-left-color: #c69a2d; color: var(--text); }
  .box-error   { background-color: #351a1a; border-left-color: #c95656; color: var(--text); }
  .box-success { background-color: #142e1c; border-left-color: #4caa69; color: var(--text); }
}
code { background: var(--code-bg); color: var(--heading); border-radius: 4px; padding: 0.1em 0.3em; }
pre, .highlight > pre { background: var(--code-bg); border: 1px solid var(--border); border-radius: 8px; }
table { color: var(--text); }
table tr { border-color: var(--border); }
table tr:nth-child(2n) { background-color: var(--bg-alt); }
table tr th, table tr td { border-color: var(--border); }

/* ---------- Footer ---------- */
footer {
  background: var(--bg-alt);
  background-image: none;
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 2.5rem 0 2rem;
  margin-top: 3rem;
}
footer .copyright, footer .theme-by, footer .bg-credit { color: var(--muted); font-family: var(--font-sans); }
footer a { color: var(--muted); }
footer a:hover { color: var(--accent); }
footer .footer-links .fa-stack .fa-circle { color: var(--border); }
footer .footer-links .fa-stack .fa-inverse { color: var(--heading); }
footer .footer-links a:hover .fa-circle { color: var(--accent); }
footer .footer-links a:hover .fa-inverse { color: #fff; }

footer .bg-credit { font-size: 0.8rem; margin-top: 0.5rem; }

/* Search overlay */
#beautifuljekyll-search-overlay { background: var(--bg); }
#nav-search-input { color: var(--heading); }
#search-results-container a { color: var(--accent); }

/* ==========================================================================
   Profile home page (_layouts/profile.html)
   ========================================================================== */
.profile {
  max-width: 62rem;
  margin: 0 auto;
  padding: 7rem 1.25rem 1rem;
}

.hero {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 2.75rem;
  align-items: center;
  padding-bottom: 2.5rem;
}
/* Circular animated visual whose edges fade to black */
.hero-visual {
  position: relative;
  width: 13rem;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  overflow: hidden;
  background: #000;
  box-shadow: 0 0 0 1px var(--border), var(--shadow);
}
.profile .hero-visual img,
.profile .hero-visual canvas {
  display: block;
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  object-position: 50% 45%;
}
.hero-visual::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: radial-gradient(circle at 50% 50%, rgba(0,0,0,0) 38%, rgba(0,0,0,0.55) 58%, #000 71%);
  pointer-events: none;
}
.hero-name {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 2.75rem;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
}
.hero-role { color: var(--muted); margin: 0 0 1rem; line-height: 1.5; }
.hero-role a { color: var(--muted); text-decoration: underline; text-decoration-color: var(--border); text-underline-offset: 3px; }
.hero-role a:hover { color: var(--accent); }
.hero-summary p { margin: 0 0 1.25rem; font-size: 1.1rem; }

.hero-buttons { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 1.25rem; }
.btn-pill {
  display: inline-block;
  padding: 0.5rem 1.15rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--heading);
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.4;
  transition: border-color .15s, background-color .15s, color .15s;
}
.btn-pill:hover, .btn-pill:focus { border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn-pill--primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-pill--primary:hover, .btn-pill--primary:focus { background: var(--accent-hover); border-color: var(--accent-hover); color: #fff; }
@media (prefers-color-scheme: dark) {
  .btn-pill--primary, .btn-pill--primary:hover, .btn-pill--primary:focus { color: #0f1216; }
}

.hero-links { list-style: none; padding: 0; margin: 0; display: flex; flex-wrap: wrap; gap: 0.35rem 1.1rem; }
.hero-links a { color: var(--muted); font-size: 0.92rem; display: inline-flex; align-items: center; gap: 0.4rem; padding: 0.2rem 0; }
.hero-links a:hover { color: var(--accent); text-decoration: none; }
.hero-links i { font-size: 1rem; width: 1.1rem; text-align: center; }

.section { padding: 2.25rem 0 0.5rem; border-top: 1px solid var(--border); }
.section-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  margin: 0 0 1.25rem;
}
.section-more { margin: 1rem 0 1.5rem; font-weight: 500; font-size: 0.95rem; }

/* Research cards (also used on /research) */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr)); gap: 1rem; margin: 1.25rem 0; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow);
  color: var(--text);
}
.card h3 { font-size: 1.05rem; margin: 0 0 0.5rem; }
.card p { margin: 0; font-size: 0.97rem; color: var(--muted); line-height: 1.6; }


/* Latest posts */
.post-cards { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr)); gap: 1rem; }
.post-cards a {
  display: flex; flex-direction: column; gap: 0.25rem; height: 100%;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text);
  transition: border-color .15s, transform .15s;
}
.post-cards a:hover { border-color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.post-card-date { font-size: 0.82rem; color: var(--muted); }
.post-card-title { font-weight: 600; color: var(--heading); line-height: 1.35; }
.post-card-sub { font-size: 0.92rem; color: var(--muted); }

/* ==========================================================================
   Publications (_includes/publication-list.html)
   ========================================================================== */
.pub-list { list-style: none; padding: 0; margin: 0 0 1rem; }
.pub { padding: 0.85rem 0; border-bottom: 1px solid var(--border); }
.pub:last-child { border-bottom: 0; }
.pub-title { display: block; font-weight: 600; color: var(--heading); line-height: 1.4; }
.pub-title:hover { color: var(--accent); }
.pub-authors { font-size: 0.93rem; color: var(--muted); margin-top: 0.2rem; }
.pub-meta { font-size: 0.9rem; color: var(--muted); margin-top: 0.15rem; }
.pub-tag {
  display: inline-block;
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.03em;
  padding: 0.05rem 0.45rem; margin-left: 0.3rem;
  border-radius: 4px;
  background: var(--accent-soft); color: var(--accent);
}
.pub-tag:hover { text-decoration: none; background: var(--accent); color: #fff; }

.pub-year { border-top: 1px solid var(--border); padding-top: 0.5rem; }
.pub-year > h2 { margin: 1rem 0 0.25rem; font-size: 1.35rem; }

/* ==========================================================================
   Mobile
   ========================================================================== */
@media (max-width: 767px) {
  body { font-size: 1rem; }
  .profile { padding-top: 5.5rem; }
  .hero { grid-template-columns: 1fr; gap: 1.25rem; text-align: center; }
  .hero-visual { width: 11rem; margin: 0 auto; }
  .hero-name { font-size: 2.1rem; }
  .hero-buttons, .hero-links { justify-content: center; }
  .hero-links span { display: none; }            /* icons only on phones */
  .hero-links i { font-size: 1.3rem; width: auto; }
  .hero-links { gap: 1.4rem; }

  /* Inline images in posts/pages: use the full width on phones */
  [role="main"] p[align="center"] img:not(.keep-size),
  .blog-post img:not(.keep-size) { width: 100% !important; }
}