/* =========================================================
   Amir Ozhan Dehghani — personal site
   Tokens first; every color on the page comes from here.
   ========================================================= */
:root {
  --bg: #0A090D;
  --panel: #13101A;
  --panel-2: #1C1726;
  --line: #2A2238;
  --line-soft: #1F1A29;
  --text: #EDE7F6;
  --text-2: #CFC6DE;
  --muted: #A79FB8;

  --research: #C084FC;   /* violet: research nodes, main accent */
  --applied: #67E8F9;    /* cyan: applied ML nodes */
  --community: #FB923C;  /* amber: community nodes */
  --available: #86EFAC;

  --font-display: "Sora", "Inter", system-ui, sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --wrap: 1280px;
  --gutter: 32px;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3, p, ol, ul { margin: 0; }
ol, ul { padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--research);
  outline-offset: 3px;
  border-radius: 6px;
}

.wrap {
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 10;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
}
.skip-link:focus { top: 16px; }

/* ---------- Header ---------- */
.site-header { position: relative; z-index: 5; }

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-block: 18px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.brand svg { flex: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: 14px;
}
.nav-links a {
  display: inline-block;
  padding: 12px 13px;
  color: var(--muted);
  transition: color 0.15s ease;
}
.nav-links a:hover { color: var(--text); }

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

/* ---------- Hero: About + brain ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 56px;
  align-items: start;
  padding-block: 40px 88px;
}

.intro {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-top: 24px;
}

.identity {
  display: flex;
  align-items: center;
  gap: 20px;
}

.avatar {
  position: relative;
  flex: none;
  width: 96px;
  height: 96px;
  border-radius: 28px;
  overflow: hidden;
  background: var(--panel-2);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 30px;
  color: var(--research);
}
.avatar img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.intro h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(36px, 4vw, 54px);
  line-height: 1.02;
  letter-spacing: -0.035em;
}
.role {
  margin-top: 8px;
  font-size: 15px;
  color: var(--muted);
}

.bio {
  display: flex;
  flex-direction: column;
  gap: 14px;
  font-size: 17px;
  line-height: 1.7;
  color: var(--text-2);
  max-width: 60ch;
}
.bio strong { color: var(--text); font-weight: 600; }

.status {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--text-2);
}
.status::before {
  content: "";
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--available);
  margin-top: 7px;
  box-shadow: 0 0 10px var(--available);
}

.actions { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
  font-family: inherit;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 46px;
  padding: 11px 20px;
  border-radius: 12px;
  font-size: 15px;
  font-weight: 600;
  transition: background-color 0.15s ease, border-color 0.15s ease;
}
.btn-primary { background: var(--text); color: var(--bg); }
.btn-primary:hover { background: #FFFFFF; }
.btn-ghost { background: transparent; border: 1px solid #3A2F4F; color: var(--text); font-weight: 500; }
.btn-ghost:hover { border-color: var(--research); }

.social { display: flex; flex-wrap: wrap; gap: 4px; font-size: 14px; }
.social a {
  padding: 10px 12px 10px 0;
  margin-right: 8px;
  color: var(--muted);
  text-decoration: underline;
  text-decoration-color: var(--line);
  text-underline-offset: 4px;
}
.social a:hover { color: var(--text); text-decoration-color: var(--research); }

/* ---------- Brain explorer ---------- */
.explorer { display: flex; flex-direction: column; gap: 16px; }

.brain {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 4;
}
.brain svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.brain-outline path {
  fill: none;
  stroke: var(--research);
  stroke-width: 1.6;
  stroke-opacity: 0.75;
  stroke-linecap: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  animation: draw 2.2s cubic-bezier(0.6, 0, 0.2, 1) 0.1s forwards;
}
.brain-sulci path {
  fill: none;
  stroke: var(--research);
  stroke-width: 1.1;
  stroke-opacity: 0.4;
  stroke-linecap: round;
}
.brain-mesh line { stroke: var(--research); stroke-opacity: 0.3; stroke-width: 0.8; }
.brain-dots circle { fill: #EBDDFF; fill-opacity: 0.85; }
.brain-clusters g { color: var(--research); }
.brain-clusters g[data-cat="a"] { color: var(--applied); }
.brain-clusters g[data-cat="c"] { color: var(--community); }
.brain-clusters ellipse {
  fill: currentColor;
  fill-opacity: 0.05;
  stroke: currentColor;
  stroke-opacity: 0.4;
  stroke-width: 1;
  stroke-dasharray: 4 5;
  transition: fill-opacity 0.25s ease, stroke-opacity 0.25s ease;
}
.brain-clusters g.is-on ellipse { fill-opacity: 0.1; stroke-opacity: 0.8; }
.brain-clusters text {
  fill: currentColor;
  font: 600 13px var(--font-body);
  letter-spacing: 0.01em;
  text-anchor: middle;
  paint-order: stroke;
  stroke: var(--bg);
  stroke-width: 4px;
  stroke-linejoin: round;
}
.brain-sulci, .brain-mesh, .brain-dots, .brain-links, .brain-clusters {
  opacity: 0;
  animation: fade 1.4s ease 0.9s forwards;
}

.brain-links line {
  stroke: #F3ECFF;
  stroke-opacity: 0.35;
  stroke-width: 1.2;
  stroke-dasharray: 3 4;
  transition: stroke-opacity 0.25s ease, stroke 0.25s ease;
}
.brain-links line.is-on {
  stroke: var(--text);
  stroke-opacity: 0.95;
  stroke-width: 1.6;
}

@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes fade { to { opacity: 1; } }
@keyframes pop { from { opacity: 0; transform: translate(-22px, -22px) scale(0.6); } to { opacity: 1; transform: translate(-22px, -22px) scale(1); } }
@keyframes halo {
  0%, 100% { box-shadow: 0 0 0 6px color-mix(in srgb, var(--c) 22%, transparent), 0 0 22px 4px color-mix(in srgb, var(--c) 60%, transparent); }
  50% { box-shadow: 0 0 0 10px color-mix(in srgb, var(--c) 12%, transparent), 0 0 30px 6px color-mix(in srgb, var(--c) 70%, transparent); }
}

.node {
  --c: var(--research);
  position: absolute;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text-2);
  font: 500 12px/1.4 var(--font-body);
  cursor: pointer;
  transform: translate(-22px, -22px);
  opacity: 0;
  animation: pop 0.5s cubic-bezier(0.2, 0.8, 0.2, 1.2) forwards;
}
.node[data-cat="a"] { --c: var(--applied); }
.node[data-cat="c"] { --c: var(--community); }

.node-hit {
  flex: none;
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
}
.node-dot {
  display: block;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--c);
  box-shadow: 0 0 12px 2px color-mix(in srgb, var(--c) 55%, transparent);
  transition: transform 0.2s ease;
}
.node[data-cat="a"] .node-dot { width: 11px; height: 11px; border-radius: 1px; transform: rotate(45deg); }
.node[data-cat="c"] .node-dot { width: 12px; height: 12px; background: var(--bg); border: 3px solid var(--c); }

.node-label {
  white-space: nowrap;
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(10, 9, 13, 0.8);
  transition: color 0.15s ease;
}

.node:hover .node-label, .node:focus-visible .node-label { color: var(--text); }
.node:hover .node-dot { transform: scale(1.25); }
.node[data-cat="a"]:hover .node-dot { transform: rotate(45deg) scale(1.25); }
.node:focus-visible { outline: none; }
.node:focus-visible .node-hit { outline: 2px solid var(--c); outline-offset: -6px; border-radius: 50%; }

.node.is-active { color: #FFFFFF; }
.node.is-active .node-dot { animation: halo 2.4s ease-in-out infinite; transform: scale(1.35); }
.node[data-cat="a"].is-active .node-dot { transform: rotate(45deg) scale(1.35); }
.node.is-active .node-label { color: #FFFFFF; background: color-mix(in srgb, var(--c) 22%, var(--bg)); }

.legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 20px;
  font-size: 13px;
  color: var(--muted);
}
.legend span { display: inline-flex; align-items: center; gap: 8px; }
.legend i { display: inline-block; flex: none; }
.legend .k-r { width: 11px; height: 11px; border-radius: 50%; background: var(--research); }
.legend .k-a { width: 9px; height: 9px; transform: rotate(45deg); background: var(--applied); }
.legend .k-c { width: 10px; height: 10px; border-radius: 50%; border: 2.5px solid var(--community); }

/* On phones the labels crowd the brain, so a tappable list takes over. */
.project-list { display: none; }

/* ---------- Project card ---------- */
.card {
  min-height: 250px;
  padding: 26px;
  border-radius: 20px;
  background: var(--panel);
  border: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.card-kind {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--c, var(--research));
}
.card-kind time { color: var(--muted); font-weight: 400; }
.card-nav { display: flex; gap: 6px; }
.icon-btn {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--text-2);
  cursor: pointer;
}
.icon-btn:hover { border-color: var(--research); color: var(--text); }
.card h2 {
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.2;
  font-weight: 600;
  letter-spacing: -0.02em;
}
.card-org { font-size: 14px; color: var(--muted); }
.card-desc { font-size: 15px; line-height: 1.65; color: var(--text-2); max-width: 64ch; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--panel-2);
  border: 1px solid #2E2540;
  font-size: 13px;
  color: #E4DBF2;
}
.card-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 2px; }
.card-intro { display: flex; flex-direction: column; gap: 12px; align-items: flex-start; }
.card-intro h2 { font-size: 22px; }
.card-intro p { color: var(--text-2); max-width: 56ch; }

/* ---------- Sections ---------- */
.section { border-top: 1px solid var(--line-soft); padding-block: 80px; }

.section-grid {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  gap: 24px 64px;
}
.section-head { display: flex; flex-direction: column; gap: 10px; }
.section-head h2 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.15;
}
.section-head p { font-size: 15px; color: var(--muted); max-width: 32ch; }

.rows { display: flex; flex-direction: column; border-bottom: 1px solid var(--line); }
.row {
  display: grid;
  grid-template-columns: 104px minmax(0, 1fr) auto;
  gap: 6px 28px;
  align-items: start;
  padding-block: 20px;
  border-top: 1px solid var(--line);
}
.row time, .row .when {
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 26px;
  color: var(--muted);
  white-space: nowrap;
}
.row-body { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.row-body h3 {
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.35;
  font-weight: 600;
}
.row-body .org { font-size: 14px; color: var(--muted); }
.row-body p { font-size: 15px; color: var(--text-2); }
.row-body strong { color: var(--text); font-weight: 600; }
.row .chip { align-self: start; justify-self: start; }
.chip-applied { background: #0F2A2E; border-color: #1F4A50; color: var(--applied); }

.news .row { grid-template-columns: 104px minmax(0, 1fr); }
.news .row-body p { font-size: 16px; color: #E4DBF2; }
.news time { color: var(--research); }

.inline-link {
  color: var(--research);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.inline-link:hover { color: #E0C3FF; }

.subgroup { margin-top: 44px; }
.subgroup h3.subhead {
  margin-bottom: 8px;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.pub-links { display: flex; flex-wrap: wrap; gap: 2px 14px; margin-top: 4px; font-size: 14px; }
.pub-links a {
  padding-block: 8px;
  color: var(--text-2);
  text-decoration: underline;
  text-decoration-color: #4A3E60;
  text-underline-offset: 4px;
}
.pub-links a:hover { color: var(--text); text-decoration-color: var(--research); }
.me { color: var(--text); font-weight: 600; }

.skill-rows { display: flex; flex-direction: column; gap: 18px; }
.skill-row { display: grid; grid-template-columns: 160px minmax(0, 1fr); gap: 8px 24px; align-items: start; }
.skill-row h3 { font-size: 14px; font-weight: 500; color: var(--muted); line-height: 32px; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line-soft); padding-block: 88px 56px; }
.footer-inner { display: flex; flex-direction: column; gap: 36px; }
.footer-lede { font-size: 17px; color: var(--muted); }
.footer-email {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 24px);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.3;
  align-self: flex-start;
  text-decoration: underline;
  text-decoration-color: var(--research);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 6px;
  overflow-wrap: anywhere;
}
.footer-email:hover { color: #FFFFFF; }
.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 24px;
  font-size: 14px;
  color: var(--muted);
}
.footer-bottom .social a { color: var(--text-2); }

/* ---------- Responsive ---------- */
@media (max-width: 1040px) {
  .hero { grid-template-columns: minmax(0, 1fr); gap: 48px; }
  .intro { padding-top: 8px; }
}

@media (max-width: 860px) {
  .section-grid { grid-template-columns: minmax(0, 1fr); }
  .section { padding-block: 64px; }
}

@media (max-width: 760px) {
  :root { --gutter: 20px; }
  .menu-toggle { display: inline-flex; }
  .nav { flex-wrap: wrap; }
  .nav-links {
    display: none;
    flex-basis: 100%;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 8px 0 4px;
    border-top: 1px solid var(--line-soft);
  }
  .nav-links.is-open { display: flex; }
  .nav-links a { padding: 13px 4px; font-size: 16px; }

  .row { grid-template-columns: minmax(0, 1fr); gap: 4px; }
  .news .row { grid-template-columns: minmax(0, 1fr); }
  .skill-row { grid-template-columns: minmax(0, 1fr); }
  .skill-row h3 { line-height: 1.4; }
  .card { padding: 22px; }
}

@media (max-width: 640px) {
  .brain-clusters text { display: none; }
  .node-label { display: none; }
  .node.is-active .node-label { display: inline-block; }
  .project-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }
  .project-list button {
    flex: none;
    min-height: 44px;
    padding: 10px 14px;
    border-radius: 999px;
    border: 1px solid var(--line);
    background: var(--panel);
    color: var(--text-2);
    font: 500 14px/1 var(--font-body);
    cursor: pointer;
  }
  .project-list button[aria-pressed="true"] { border-color: var(--research); color: var(--text); background: var(--panel-2); }
  .identity { align-items: flex-start; }
  .avatar { width: 76px; height: 76px; border-radius: 22px; font-size: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-delay: 0ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .brain-outline path { stroke-dashoffset: 0; }
}