/* ===========================================================
   Shir Rozenfeld — academic homepage, lighter & friendlier
   Soft pastel wash, bold display headings, colored pill labels,
   light cards, scroll-reveal motion. Header kept understated.
   =========================================================== */

:root {
  --ink:     #2a2d3a;   /* body text */
  --navy:    #20243f;   /* headings */
  --muted:   #6b7180;   /* meta / secondary */
  --line:    #ebe7e1;   /* hairline dividers */
  --card:    #ffffff;
  --accent:  #3a6ea5;   /* links — calm blue */
  --accent-2:#2c5680;   /* link hover */

  /* pill / accent hues */
  --teal-bg:#d8f1ec; --teal-fg:#1f7a6b;
  --coral-bg:#fde2d9; --coral-fg:#c2573a;
  --blue-bg:#dde8fb; --blue-fg:#2f5fa8;
  --violet-bg:#e8e1fb; --violet-fg:#5a45b0;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --display: "Space Grotesk", var(--sans);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;

  --maxw: 760px;
  --pad: 24px;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  background: #fdfcfb;
}
/* soft pastel wash — composited once (no scroll repaint), low alpha keeps text readable */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(820px 520px at 88% -8%, rgba(255, 206, 158, 0.34), transparent 60%),
    radial-gradient(760px 520px at -8% 4%, rgba(186, 222, 255, 0.30), transparent 58%),
    radial-gradient(900px 700px at 50% 112%, rgba(200, 245, 224, 0.26), transparent 60%);
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

/* ---- typography ---- */
h1, h2, h3 { color: var(--navy); line-height: 1.2; }
p { margin: 0 0 1rem; }
strong { color: var(--navy); font-weight: 600; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); text-decoration: underline; text-underline-offset: 2px; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }
.muted { color: var(--muted); }
.small { font-size: 0.9rem; }

/* ---- top bar (kept as-is: understated, no display font) ---- */
.topbar {
  position: sticky; top: 0; z-index: 10;
  background: rgba(253, 252, 251, 0.82);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar__inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 12px var(--pad);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.topbar__name { color: var(--navy); font-weight: 600; font-size: 0.95rem; white-space: nowrap; }
.topbar__name:hover { color: var(--navy); text-decoration: none; }
.topbar__nav { display: flex; gap: 18px; overflow-x: auto; scrollbar-width: none; }
.topbar__nav::-webkit-scrollbar { display: none; }
.topbar__nav a { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }
.topbar__nav a:hover { color: var(--navy); text-decoration: none; }
.topbar__nav a.is-active { color: var(--navy); }

/* ---- hero ---- */
.hero { padding: 66px 0 8px; text-align: center; animation: rise 0.7s ease both; }
.hero__avatar {
  width: 116px; height: 116px; border-radius: 50%;
  object-fit: cover; object-position: center 20%;
  border: 3px solid #fff;
  box-shadow: 0 10px 30px -10px rgba(32, 36, 63, 0.28);
  margin-bottom: 20px;
}
.hero__name {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(2.4rem, 7vw, 3.3rem);
  letter-spacing: -0.02em;
  margin: 0 0 10px;
}
.hero__role {
  font-size: 1.15rem; color: var(--ink);
  max-width: 38ch; margin: 0 auto 10px;
}
.hero__affil { color: var(--muted); font-size: 0.95rem; margin: 0 0 18px; }

@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }

/* ---- inline link rows (social / contact) ---- */
.links { display: flex; flex-wrap: wrap; gap: 6px 0; justify-content: center; }
.links a { position: relative; padding: 0 14px; font-size: 0.95rem; }
.links a + a::before {
  content: ""; position: absolute; left: 0; top: 50%;
  transform: translateY(-50%); width: 1px; height: 0.9em; background: var(--line);
}
#social-contact { justify-content: flex-start; }
#social-contact a:first-child { padding-left: 0; }

.contact__email { margin: 0 0 0.7rem; font-size: 1.04rem; }
.contact__email a { font-weight: 600; }

/* ---- sections ---- */
.section { padding: 44px 0; border-top: 1px solid var(--line); }
.section__head { margin-bottom: 1.3rem; }
.kicker {
  display: inline-block;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.07em; text-transform: uppercase;
  padding: 3px 11px; border-radius: 999px; margin-bottom: 10px;
}
.kicker--teal   { background: var(--teal-bg);   color: var(--teal-fg); }
.kicker--coral  { background: var(--coral-bg);  color: var(--coral-fg); }
.kicker--blue   { background: var(--blue-bg);   color: var(--blue-fg); }
.kicker--violet { background: var(--violet-bg); color: var(--violet-fg); }

.section__title {
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.8rem, 4.2vw, 2.4rem);
  letter-spacing: -0.02em;
  margin: 0;
}
.section p { color: var(--ink); }
.sub { font-family: var(--display); font-size: 1.05rem; font-weight: 600; margin: 1.6rem 0 0.4rem; }

/* lists */
.plain { list-style: none; margin: 0; padding: 0; }
.plain li { margin-bottom: 0.5rem; color: var(--ink); }
.li__main { color: var(--navy); font-weight: 600; }
.meta { color: var(--muted); }

/* ---- research areas (light cards) ---- */
.areas { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.area {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px 20px;
  border-top: 3px solid var(--accent);
  box-shadow: 0 8px 24px -16px rgba(32, 36, 63, 0.25);
  transition: transform 0.18s ease, box-shadow 0.22s ease;
}
.area:hover { transform: translateY(-3px); box-shadow: 0 16px 34px -18px rgba(32, 36, 63, 0.32); }
.area--c1 { border-top-color: #2f9e8c; }
.area--c2 { border-top-color: #3a6ea5; }
.area--c3 { border-top-color: #c2573a; }
.area--c4 { border-top-color: #5a45b0; }
.area h3 { font-family: var(--display); font-size: 1rem; margin: 0 0 0.35rem; }
.area p { margin: 0; color: var(--ink); font-size: 0.96rem; }

/* ---- news ---- */
.news { list-style: none; margin: 0; padding: 0; }
.news-item { display: grid; grid-template-columns: 64px 1fr; gap: 16px; margin-bottom: 1.1rem; }
.news__date { font-family: var(--mono); font-size: 0.82rem; color: var(--muted); padding-top: 2px; }
.news__title { color: var(--navy); font-weight: 600; margin: 0 0 0.2rem; }
.news__desc { margin: 0; color: var(--ink); font-size: 0.96rem; }

/* ---- publications ---- */
.pubs { list-style: none; margin: 0; padding: 0; }
.pub { margin-bottom: 1.6rem; }
.pub__title { color: var(--navy); font-weight: 600; margin: 0 0 0.15rem; }
.pub__authors { margin: 0 0 0.1rem; color: var(--ink); font-size: 0.97rem; }
.pub__venue { margin: 0 0 0.35rem; color: var(--muted); font-family: var(--mono); font-size: 0.84rem; }

/* shared external-link rows */
.linkrow { margin: 0; display: flex; flex-wrap: wrap; gap: 14px; }
.linkrow a { font-family: var(--mono); font-size: 0.85rem; }
.linkrow a::before { content: "↗ "; color: var(--muted); }

/* ---- talks ---- */
.talk { margin-bottom: 1.3rem; }
.talk__title { color: var(--navy); font-weight: 600; margin: 0 0 0.15rem; }
.talk__meta { font-family: var(--mono); font-size: 0.84rem; color: var(--muted); margin: 0 0 0.3rem; }
.talk__desc { margin: 0 0 0.5rem; color: var(--ink); font-size: 0.97rem; }

/* ---- footer ---- */
.footer {
  border-top: 1px solid var(--line);
  padding-top: 24px; padding-bottom: 48px; margin-top: 8px;
  color: var(--muted); font-size: 0.9rem;
}
.footer p { margin: 0 0 0.2rem; }

/* ---- scroll reveal ---- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s cubic-bezier(.2,.7,.2,1), transform 0.6s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
/* gentle stagger for grid items */
.areas .area:nth-child(2), .news-item:nth-child(2) { transition-delay: 0.06s; }
.areas .area:nth-child(3) { transition-delay: 0.04s; }
.areas .area:nth-child(4) { transition-delay: 0.10s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero { animation: none; }
}

/* ---- responsive ---- */
@media (max-width: 560px) {
  body { font-size: 16px; }
  .hero { padding-top: 44px; }
  .areas { grid-template-columns: 1fr; gap: 14px; }
  .topbar__name { display: none; }
  .topbar__inner { justify-content: center; }
  .topbar__nav { width: 100%; justify-content: space-between; gap: 12px; }
  .news-item { grid-template-columns: 56px 1fr; gap: 12px; }
}