/* ============================================================
   Ali Behrouz — personal academic site
   Modern-minimal, light theme. No frameworks, no build step.
   Accent + spacing controlled by the variables below.
   ============================================================ */

:root {
  --bg: #ffffff;
  --wash: #f0f5ff;         /* soft top-of-page tint */
  --ink: #18181b;          /* primary text */
  --muted: #6b7280;        /* secondary text */
  --faint: #9ca3af;        /* dates, footer */
  --line: #e7e7ea;         /* hairlines */
  --accent: #1d4ed8;       /* links & highlights */
  --accent-ink: #1e40af;   /* chip text on soft blue */
  --accent-soft: #eef3fe;  /* soft accent background */
  --chip-bg: #e8effc;      /* venue chip (soft blue) */
  --chip-ink: #1e4fbb;
  --gray-bg: #f4f4f5;      /* preprint chip */
  --gray-ink: #52525b;
  --award-bg: #fdf1d7;     /* award chip */
  --award-ink: #92500e;
  --media-bg: #f3edfd;     /* press chip (soft violet) */
  --media-ink: #6d3fd8;
  --maxw: 53rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Inter", ui-sans-serif, system-ui, -apple-system, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: linear-gradient(180deg, var(--wash) 0%, var(--bg) 26rem) no-repeat var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent-soft); }

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.86);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 650;
  letter-spacing: -0.015em;
  color: var(--ink);
  white-space: nowrap;
}
.brand:hover { text-decoration: none; color: var(--accent); }

.site-nav {
  display: flex;
  gap: 0.3rem 1.15rem;
  flex-wrap: wrap;
  font-size: 0.92rem;
}
.site-nav a { color: var(--muted); }
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a.active { color: var(--accent); font-weight: 550; }
.site-nav a .ext { font-size: 0.8em; opacity: 0.7; }

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

main {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 1.25rem 4rem;
}

section { margin-top: 3rem; }

h1 {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0;
}

.page-title {
  font-size: 1.55rem;
  margin-top: 2.75rem;
}

.page-lede {
  color: var(--muted);
  margin: 0.6rem 0 0;
  font-size: 0.97rem;
}

h2 {
  font-size: 1.17rem;
  font-weight: 650;
  letter-spacing: -0.015em;
  margin: 0 0 0.35rem;
  padding-bottom: 0.6rem;
  border-bottom: 1px solid var(--line);
  position: relative;
}
h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 2.9rem;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

h3.year {
  font-size: 1rem;
  font-weight: 650;
  color: var(--accent-ink);
  margin: 2.4rem 0 0.2rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--line);
  position: relative;
}
h3.year::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 2rem;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* ---------- hero ---------- */

.hero {
  display: flex;
  align-items: center;
  gap: 2rem;
  margin-top: 3.25rem;
  flex-wrap: wrap;
}

.hero img {
  width: 172px;
  height: 172px;
  object-fit: cover;
  object-position: top;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 4px #fff, 0 0 0 5px var(--line), 0 14px 34px rgba(29, 78, 216, 0.14);
}

.role {
  color: var(--muted);
  margin: 0.55rem 0 0;
  line-height: 1.55;
}
.role .at { color: var(--faint); }
.role b { font-weight: 550; color: var(--ink); }

/* ---------- link pills ---------- */

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1rem;
}

.links a {
  display: inline-flex;
  align-items: center;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.28rem 0.75rem;
  transition: border-color 120ms ease, color 120ms ease, background 120ms ease;
}
.links a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
}

/* ---------- intro / prose ---------- */

.intro p { margin: 1.05rem 0; }
.intro .hello { margin-top: 2.25rem; }

details.collab {
  margin-top: 1.2rem;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 1rem;
  font-size: 0.95rem;
}
details.collab summary {
  cursor: pointer;
  font-weight: 550;
  color: var(--accent);
}
details.collab p { margin: 0.6rem 0 0.2rem; color: var(--muted); }

/* ---------- publications ---------- */

.publist { margin: 0; padding: 0; list-style: none; }

.pub {
  padding: 1.05rem 0;
  border-bottom: 1px solid var(--line);
}
.pub:last-child { border-bottom: none; }

.pub .title {
  font-weight: 600;
  letter-spacing: -0.008em;
  line-height: 1.45;
  margin: 0;
}
.pub .title a { color: var(--ink); }
.pub .title a:hover { color: var(--accent); text-decoration: none; }
.pub .title .nolink { color: var(--ink); }

.pub .authors {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0.15rem 0 0;
}
.pub .authors .me { color: var(--ink); font-weight: 550; }

.pub .meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin-top: 0.55rem;
  font-size: 0.78rem;
}

.chip {
  display: inline-block;
  padding: 0.13rem 0.6rem;
  border-radius: 999px;
  background: var(--chip-bg);
  color: var(--chip-ink);
  font-weight: 550;
  letter-spacing: 0.01em;
}
.chip.preprint { background: var(--gray-bg); color: var(--gray-ink); }
.chip.award { background: var(--award-bg); color: var(--award-ink); }
.chip.media { background: var(--media-bg); color: var(--media-ink); }

a.plink {
  display: inline-block;
  padding: 0.1rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 7px;
  color: var(--muted);
  font-weight: 500;
  transition: border-color 120ms ease, color 120ms ease;
}
a.plink:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}

.pub .note {
  color: var(--faint);
  font-size: 0.85rem;
  margin: 0.35rem 0 0;
}

/* ---------- news ---------- */

.news { list-style: none; margin: 0.4rem 0 0; padding: 0; }

.news li {
  display: flex;
  gap: 1.2rem;
  padding: 0.5rem 0;
}

.news .date {
  flex: 0 0 6.6rem;
  color: var(--faint);
  font-size: 0.88rem;
  padding-top: 0.1rem;
  font-variant-numeric: tabular-nums;
}

.news .what { flex: 1; }

/* ---------- generic row list (awards, datasets) ---------- */

.rows { list-style: none; margin: 0.4rem 0 0; padding: 0; }

.rows li {
  display: flex;
  gap: 1.2rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--line);
}
.rows li:last-child { border-bottom: none; }

.rows .date {
  flex: 0 0 6.6rem;
  color: var(--faint);
  font-size: 0.88rem;
  padding-top: 0.1rem;
  font-variant-numeric: tabular-nums;
}

.rows .what { flex: 1; }

.rows .hl { color: var(--award-ink); font-weight: 550; }

/* ---------- talks ---------- */

.talklist { list-style: none; margin: 0.4rem 0 0; padding: 0; }
.talklist li {
  padding: 0.45rem 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px dashed var(--line);
}
.talklist li:last-child { border-bottom: none; }
.talklist .when {
  color: var(--faint);
  font-size: 0.88rem;
  white-space: nowrap;
  padding-top: 0.1rem;
}

/* ---------- podcasts ---------- */

.podgrid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: 1rem;
  margin-top: 1.15rem;
}

.podcard {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.05rem 1.15rem 1rem;
  background: linear-gradient(180deg, #fbfcff 0%, #ffffff 100%);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.podcard:hover {
  border-color: #c7d6f8;
  box-shadow: 0 6px 18px rgba(29, 78, 216, 0.07);
}

.podcard .show {
  font-size: 0.74rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 650;
}

.podcard .ep {
  font-weight: 600;
  line-height: 1.42;
  letter-spacing: -0.008em;
}

.podcard .when {
  color: var(--faint);
  font-size: 0.85rem;
}

.podcard .meta {
  margin-top: auto;
  padding-top: 0.5rem;
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  font-size: 0.78rem;
  align-items: center;
}

/* ---------- code / bibtex ---------- */

pre {
  background: #fafafa;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem 1.15rem;
  overflow-x: auto;
  font-size: 0.8rem;
  line-height: 1.55;
}
code { font-family: ui-monospace, "SF Mono", "Cascadia Code", Menlo, Consolas, monospace; }

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

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 2rem;
  background: #fbfcfe;
}
.site-footer .inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 1.4rem 1.25rem 2rem;
  display: flex;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  flex-wrap: wrap;
  color: var(--faint);
  font-size: 0.85rem;
}
.site-footer a { color: var(--muted); }

/* ---------- small screens ---------- */

@media (max-width: 560px) {
  .hero { gap: 1.4rem; margin-top: 2.25rem; }
  .hero img { width: 124px; height: 124px; }
  h1 { font-size: 1.6rem; }
  .news li, .rows li { flex-direction: column; gap: 0.05rem; }
  .news .date, .rows .date { flex: none; }
  .talklist li { flex-direction: column; gap: 0.05rem; }
}