/* =========================================================
   Soheil Feizi — Reliable AI Lab
   Editorial / refined-modern academic theme
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300..600;1,9..144,300..500&family=Spline+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --paper:        #eef2f7;
  --paper-card:   #fbfcff;
  --paper-sunk:   #e2e8f1;
  --ink:          #0e1626;
  --ink-bg:       #0b1120;
  --ink-bg-2:     #151e30;
  --ink-soft:     #44505f;
  --ink-faint:    #8492a3;
  --cream:        #eef3fb;
  --cream-soft:   #94a3b8;
  /* accent (blue) — variable names kept generic for the rest of the sheet */
  --crimson:      #1c5fb0;
  --crimson-deep: #0f3f7c;
  --crimson-lit:  #6aa6ff;
  --line:         rgba(14,22,38,.12);
  --line-strong:  rgba(14,22,38,.22);
  --line-dark:    rgba(238,243,251,.14);

  --serif: "Fraunces", Georgia, serif;
  --sans:  "Spline Sans", system-ui, sans-serif;
  --mono:  "JetBrains Mono", ui-monospace, monospace;

  --wrap: 1180px;
  --ease: cubic-bezier(.2,.7,.2,1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink-soft);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: .005em;
  overflow-x: hidden;
  position: relative;
}

/* subtle film grain over everything */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: .035;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

a { color: var(--crimson); text-decoration: none; transition: color .2s var(--ease); }
a:hover { color: var(--crimson-deep); }

img { max-width: 100%; display: block; }

.wrap { width: 100%; max-width: var(--wrap); margin: 0 auto; padding: 0 28px; }

/* ---------- typography helpers ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: .73rem;
  font-weight: 500;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--crimson);
}
.serif { font-family: var(--serif); }

h1, h2, h3 { font-family: var(--serif); color: var(--ink); font-weight: 400; line-height: 1.08; letter-spacing: -.015em; }

/* =========================================================
   NAV
   ========================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.2);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), background .3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--line); }
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 70px;
}
.brand {
  font-family: var(--serif);
  font-size: 1.32rem;
  color: var(--ink);
  font-weight: 500;
  letter-spacing: -.02em;
  display: flex; align-items: baseline; gap: .55rem;
}
.brand .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--crimson); display: inline-block; transform: translateY(-1px); }
.brand:hover { color: var(--ink); }

.menu { display: flex; align-items: center; gap: 2px; list-style: none; }
.menu a {
  display: block;
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 9px 14px;
  border-radius: 999px;
  transition: color .2s var(--ease), background .2s var(--ease);
}
.menu a:hover { color: var(--ink); background: var(--paper-sunk); }
.menu a.active { color: var(--crimson); }

.burger { display: none; background: none; border: 0; cursor: pointer; width: 42px; height: 42px; position: relative; }
.burger span { position: absolute; left: 9px; right: 9px; height: 2px; background: var(--ink); transition: .3s var(--ease); }
.burger span:nth-child(1) { top: 15px; }
.burger span:nth-child(2) { top: 21px; }
.burger span:nth-child(3) { top: 27px; }
.burger.open span:nth-child(1) { top: 21px; transform: rotate(45deg); }
.burger.open span:nth-child(2) { opacity: 0; }
.burger.open span:nth-child(3) { top: 21px; transform: rotate(-45deg); }

/* =========================================================
   HERO  (dark bookend)
   ========================================================= */
.hero {
  background: var(--ink-bg);
  color: var(--cream);
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line-dark);
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(60% 80% at 78% 18%, rgba(28,95,176,.50), transparent 60%),
    radial-gradient(50% 60% at 12% 95%, rgba(28,95,176,.20), transparent 60%),
    radial-gradient(40% 50% at 50% 0%, rgba(106,166,255,.14), transparent 70%);
  pointer-events: none;
}
.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: 1.35fr .85fr;
  gap: 56px;
  align-items: center;
  padding: clamp(56px, 9vw, 110px) 0 clamp(48px, 7vw, 84px);
}
.hero .eyebrow { color: var(--crimson-lit); }
.hero h1 {
  color: var(--cream);
  font-size: clamp(3.1rem, 8.5vw, 6.4rem);
  font-weight: 400;
  margin: 18px 0 6px;
}
.hero h1 em { font-style: italic; color: var(--crimson-lit); }
.hero .role {
  font-family: var(--mono);
  font-size: clamp(.82rem, 1.4vw, .95rem);
  letter-spacing: .04em;
  color: var(--cream-soft);
  margin-bottom: 26px;
}
.hero .role b { color: var(--cream); font-weight: 500; }
.hero .creds {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}
.hero .creds span {
  font-family: var(--mono);
  font-size: .76rem;
  letter-spacing: .05em;
  color: var(--cream-soft);
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  padding: 6px 14px;
  background: rgba(255,255,255,.03);
}
.hero .creds b { color: var(--crimson-lit); font-weight: 600; }
.hero .lede {
  font-size: 1.12rem;
  line-height: 1.65;
  color: #d9d0bf;
  max-width: 40ch;
  margin-bottom: 30px;
}
.hero .lede strong { color: var(--cream); font-weight: 600; }

.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  padding: 13px 22px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: transform .25s var(--ease), background .25s var(--ease), border-color .25s var(--ease), color .25s var(--ease);
  cursor: pointer;
}
.btn-primary { background: var(--crimson); color: #fff; }
.btn-primary:hover { background: #fff; color: var(--ink); transform: translateY(-2px); }
.btn-ghost { border-color: var(--line-dark); color: var(--cream); }
.btn-ghost:hover { border-color: var(--cream); color: var(--cream); transform: translateY(-2px); }

/* portrait */
.portrait {
  position: relative;
  justify-self: center;
}
.portrait img {
  width: clamp(260px, 32vw, 360px);
  aspect-ratio: 4 / 5;
  object-fit: cover;
  object-position: 50% 16%;
  border-radius: 12px;
  border: 1px solid rgba(238,243,251,.16);
  box-shadow: 0 40px 80px -34px rgba(0,0,0,.75);
  display: block;
}
.portrait::before {
  content: "";
  position: absolute;
  inset: -22px;
  background: radial-gradient(62% 62% at 72% 82%, rgba(106,166,255,.30), transparent 70%);
  filter: blur(6px);
  z-index: -1;
  border-radius: 24px;
}

/* stat strip under hero */
.stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-dark);
}
.stats .stat {
  padding: 26px 28px;
  border-right: 1px solid var(--line-dark);
}
.stats .stat:last-child { border-right: 0; }
.stats .num { font-family: var(--serif); font-size: 2.1rem; color: var(--cream); line-height: 1; }
.stats .num span { color: var(--crimson-lit); }
.stats .lbl { font-family: var(--mono); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--cream-soft); margin-top: 8px; }

/* =========================================================
   SECTIONS (paper)
   ========================================================= */
.section { padding: clamp(64px, 9vw, 110px) 0; }
.section + .section { border-top: 1px solid var(--line); }

.sec-head { margin-bottom: 48px; max-width: 60ch; }
.sec-head h2 { font-size: clamp(2rem, 4.5vw, 3.2rem); margin: 14px 0 0; }

/* two-column intro */
.bio-grid { display: grid; grid-template-columns: 1fr 1.35fr; gap: clamp(32px, 6vw, 90px); align-items: start; }
.bio-grid .label-col .eyebrow { display: block; margin-bottom: 14px; }
.bio-grid p { margin-bottom: 18px; }
.bio-grid p:last-child { margin-bottom: 0; }
.bio-grid strong, .prose strong { color: var(--ink); font-weight: 600; }
.lab-name { color: var(--crimson); font-weight: 600; }

/* research areas */
.areas { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 10px; overflow: hidden; }
.area {
  background: var(--paper-card);
  padding: 32px 30px;
  transition: background .3s var(--ease), transform .3s var(--ease);
  position: relative;
}
.area:hover { background: var(--paper); }
.area .idx { font-family: var(--mono); font-size: .72rem; letter-spacing: .14em; color: var(--crimson); }
.area h3 { font-size: 1.5rem; margin: 16px 0 10px; }
.area p { font-size: .95rem; line-height: 1.6; }

/* highlight cards (replaces NEWS) */
.highlights { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.hl {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 28px 30px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.hl:hover { transform: translateY(-3px); box-shadow: 0 24px 48px -28px rgba(22,19,14,.4); border-color: var(--line-strong); }
.hl .tag { font-family: var(--mono); font-size: .68rem; letter-spacing: .16em; text-transform: uppercase; color: var(--crimson); }
.hl.featured { grid-column: span 2; background: var(--ink-bg); color: var(--cream); border-color: transparent; position: relative; overflow: hidden; }
.hl.featured::before { content:""; position:absolute; inset:0; background: radial-gradient(70% 120% at 90% 0%, rgba(106,166,255,.30), transparent 55%); }
.hl.featured h3, .hl.featured .tag { color: var(--cream); position: relative; }
.hl.featured .tag { color: var(--crimson-lit); }
.hl.featured p { color: #d3cabb; position: relative; }
.hl.featured a { color: var(--crimson-lit); position: relative; }
.hl h3 { font-size: 1.45rem; line-height: 1.12; }
.hl p { font-size: .96rem; line-height: 1.55; }
.hl .more { font-family: var(--mono); font-size: .72rem; letter-spacing: .08em; margin-top: auto; }

/* callout band */
.callout {
  background: var(--paper-sunk);
  border-radius: 16px;
  padding: clamp(36px, 6vw, 64px);
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 32px;
  align-items: center;
}
.callout h3 { font-size: clamp(1.6rem, 3vw, 2.3rem); margin-bottom: 12px; }
.callout p { max-width: 56ch; }

/* social inline */
.socials { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 6px; }
.socials a {
  font-family: var(--mono); font-size: .74rem; letter-spacing: .08em;
  padding: 9px 16px; border: 1px solid var(--line-strong); border-radius: 999px; color: var(--ink-soft);
  transition: all .25s var(--ease);
}
.socials a:hover { background: var(--ink); color: var(--cream); border-color: var(--ink); transform: translateY(-2px); }

/* =========================================================
   INNER PAGE HEADER
   ========================================================= */
.page-head {
  background: var(--ink-bg);
  color: var(--cream);
  position: relative;
  overflow: hidden;
  padding: clamp(60px, 9vw, 104px) 0 clamp(40px, 6vw, 64px);
}
.page-head::before {
  content:""; position:absolute; inset:0;
  background: radial-gradient(55% 90% at 85% 10%, rgba(28,95,176,.40), transparent 60%);
}
.page-head .inner { position: relative; }
.page-head h1 { color: var(--cream); font-size: clamp(2.6rem, 7vw, 5rem); margin-top: 14px; }
.page-head .sub { color: #cfc6b6; max-width: 56ch; margin-top: 18px; font-size: 1.05rem; }
.page-head .eyebrow { color: var(--crimson-lit); }

/* =========================================================
   PUBLICATIONS
   ========================================================= */
.year-block { margin-bottom: 8px; }
.year-head {
  display: flex; align-items: baseline; gap: 18px;
  padding: 38px 0 22px;
  position: sticky; top: 70px;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  backdrop-filter: blur(8px);
  z-index: 5;
}
.year-head .yr { font-family: var(--serif); font-size: 2.4rem; color: var(--ink); }
.year-head .rule { flex: 1; height: 1px; background: var(--line); }
.year-head .count { font-family: var(--mono); font-size: .72rem; letter-spacing: .12em; color: var(--ink-faint); }

.pub {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left .3s var(--ease);
}
.pub:hover { padding-left: 14px; }
.pub .t { font-family: var(--serif); font-size: 1.28rem; line-height: 1.25; color: var(--ink); }
.pub .a { font-size: .94rem; color: var(--ink-soft); }
.pub .a b { color: var(--ink); font-weight: 600; }
.pub .meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin-top: 4px; }
.pub .venue { font-family: var(--mono); font-size: .73rem; letter-spacing: .07em; text-transform: uppercase; color: var(--ink); background: var(--paper-sunk); padding: 4px 11px; border-radius: 999px; }
.pub .award { font-family: var(--mono); font-size: .72rem; letter-spacing: .04em; color: var(--crimson-deep); }
.pub .links a { font-family: var(--mono); font-size: .73rem; letter-spacing: .05em; margin-right: 12px; }

/* =========================================================
   CARDS GRID (advising / awards / teaching)
   ========================================================= */
.grid { display: grid; gap: 16px; }
.grid.g2 { grid-template-columns: repeat(2, 1fr); }
.grid.g3 { grid-template-columns: repeat(3, 1fr); }
.grid.g4 { grid-template-columns: repeat(4, 1fr); }

.card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 26px 26px;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.card:hover { transform: translateY(-3px); box-shadow: 0 22px 44px -28px rgba(22,19,14,.38); border-color: var(--line-strong); }
.card h3 { font-size: 1.3rem; line-height: 1.18; margin-bottom: 8px; }
.card .meta { font-family: var(--mono); font-size: .72rem; letter-spacing: .1em; text-transform: uppercase; color: var(--crimson); margin-bottom: 12px; }
.card p { font-size: .95rem; line-height: 1.55; }
.card .next { font-family: var(--mono); font-size: .74rem; color: var(--ink-faint); margin-top: 6px; }

/* people chips */
.people { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.person {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 18px;
  transition: transform .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.person:hover { transform: translateY(-2px); border-color: var(--crimson); }
.person .nm { font-family: var(--serif); font-size: 1.18rem; color: var(--ink); }
.person .lk { font-family: var(--mono); font-size: .7rem; letter-spacing: .08em; text-transform: uppercase; }
.person .yr { font-family: var(--mono); font-size: .72rem; color: var(--ink-faint); }

/* award list */
.award-list { border-top: 1px solid var(--line); }
.award-item {
  display: grid; grid-template-columns: 88px 1fr auto; gap: 24px; align-items: baseline;
  padding: 22px 0; border-bottom: 1px solid var(--line);
  transition: padding-left .3s var(--ease);
}
.award-item:hover { padding-left: 12px; }
.award-item .yr { font-family: var(--mono); font-size: .9rem; color: var(--crimson); letter-spacing: .04em; }
.award-item .nm { font-family: var(--serif); font-size: 1.32rem; color: var(--ink); line-height: 1.2; }
.award-item .org { font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; text-transform: uppercase; color: var(--ink-faint); text-align: right; }

/* contact */
.contact-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.contact-card { background: var(--paper-card); border: 1px solid var(--line); border-radius: 14px; padding: 34px 30px; }
.contact-card .eyebrow { display:block; margin-bottom: 16px; }
.contact-card h3 { font-size: 1.5rem; margin-bottom: 8px; }
.contact-card p, .contact-card a { font-size: 1rem; }

/* =========================================================
   FOOTER (dark bookend)
   ========================================================= */
.footer { background: var(--ink-bg); color: var(--cream-soft); padding: 64px 0 40px; }
.footer-top { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 28px; padding-bottom: 36px; border-bottom: 1px solid var(--line-dark); }
.footer .f-brand { font-family: var(--serif); font-size: 1.8rem; color: var(--cream); }
.footer .f-brand .dot { color: var(--crimson-lit); }
.footer .f-links { display: flex; flex-wrap: wrap; gap: 18px; }
.footer .f-links a { font-family: var(--mono); font-size: .76rem; letter-spacing: .1em; text-transform: uppercase; color: var(--cream-soft); }
.footer .f-links a:hover { color: var(--cream); }
.footer .f-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; padding-top: 26px; font-family: var(--mono); font-size: .72rem; letter-spacing: .06em; color: rgba(182,171,151,.7); }

/* =========================================================
   REVEAL ANIMATION
   ========================================================= */
.js .reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .js .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .portrait { justify-self: center; order: -1; width: 100%; }
  .portrait img { width: min(320px, 76vw); margin: 0 auto; }
  .bio-grid { grid-template-columns: 1fr; }
  .areas { grid-template-columns: 1fr; }
  .highlights { grid-template-columns: 1fr; }
  .hl.featured { grid-column: span 1; }
  .people { grid-template-columns: repeat(3, 1fr); }
  .contact-grid { grid-template-columns: 1fr; }
  .callout { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  body { font-size: 16px; }
  .menu { display: none; position: absolute; top: 70px; left: 0; right: 0; flex-direction: column; gap: 0; background: var(--paper); border-bottom: 1px solid var(--line); padding: 8px 16px 16px; }
  .menu.open { display: flex; }
  .menu a { padding: 13px 8px; border-radius: 0; border-bottom: 1px solid var(--line); }
  .burger { display: block; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats .stat:nth-child(2) { border-right: 0; }
  .stats .stat:nth-child(1), .stats .stat:nth-child(2) { border-bottom: 1px solid var(--line-dark); }
  .grid.g2, .grid.g3, .grid.g4 { grid-template-columns: 1fr; }
  .people { grid-template-columns: repeat(2, 1fr); }
  .award-item { grid-template-columns: 1fr; gap: 6px; }
  .award-item .org { text-align: left; }
  .year-head { top: 70px; }
}