:root {
  --ink: #142433;
  --ink-soft: #3b4e5d;
  --teal: #165e59;
  --teal-deep: #0d3f3b;
  --gold: #8f5a12;
  --paper: #f5f2eb;
  --paper-2: #ece7dc;
  --card: #fffdfa;
  --muted: #5d6c77;
  --line: #ddd6c9;
  --ring: #165e59;
  --danger: #b42318;
  --ok: #146c54;
  --cta: #142433;
  --on-cta: #f5f2eb;
  --shadow: 0 18px 44px color-mix(in srgb, var(--ink) 10%, transparent);
  --radius: 18px;
  --header: 76px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --font-display: "Figtree", "Vazirmatn", sans-serif;
  --font-body: "Noto Sans", "Vazirmatn", sans-serif;
  --max: 1120px;
  color-scheme: light;
}

html[dir="rtl"] {
  --font-display: "Vazirmatn", "Figtree", sans-serif;
  --font-body: "Vazirmatn", "Noto Sans", sans-serif;
}

html[data-theme="dark"] {
  --ink: #edf2f6;
  --ink-soft: #c2ced8;
  --teal: #6ec4bb;
  --teal-deep: #a8ddd7;
  --gold: #e0b56a;
  --paper: #0d141d;
  --paper-2: #131b26;
  --card: #1a2430;
  --muted: #8e9eab;
  --line: #2b3848;
  --ring: #6ec4bb;
  --cta: #08111a;
  --on-cta: #edf2f6;
  --shadow: 0 18px 44px rgba(0, 0, 0, 0.42);
  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
button, input, textarea { font: inherit; }

.page-shell {
  min-height: 100vh;
  background:
    radial-gradient(circle at 12% -10%, color-mix(in srgb, var(--teal) 14%, transparent), transparent 36%),
    radial-gradient(circle at 100% 8%, color-mix(in srgb, var(--gold) 10%, transparent), transparent 30%),
    var(--paper);
}

.container {
  width: min(var(--max), calc(100% - 2rem));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  inset-inline-start: 1rem;
  top: -4rem;
  z-index: 80;
  background: var(--ink);
  color: var(--paper);
  padding: 0.7rem 1rem;
  border-radius: 10px;
}

.skip-link:focus { top: 1rem; }

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--paper) 82%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--line);
  box-shadow: 0 8px 24px color-mix(in srgb, var(--ink) 6%, transparent);
}

.header-inner {
  min-height: var(--header);
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  min-height: 44px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.04em;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text strong { font-family: var(--font-display); font-size: 1rem; }
.brand-text span { color: var(--muted); font-size: 0.78rem; }

.nav-desktop { margin-inline-start: auto; }
.nav-desktop ul,
.nav-mobile ul,
.honor-list,
.plain-list,
.profile-links,
.course-grid,
.workshop-list,
.pub-list { list-style: none; margin: 0; padding: 0; }

.nav-desktop ul { display: flex; gap: 0.2rem; }
.nav-desktop a,
.nav-mobile a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0.4rem 0.8rem;
  text-decoration: none;
  border-radius: 999px;
  color: var(--ink-soft);
}

.nav-desktop a[aria-current="page"],
.nav-mobile a[aria-current="page"] {
  background: var(--paper-2);
  color: var(--ink);
}

.header-actions { display: flex; align-items: center; gap: 0.35rem; }
.nav-desktop + .header-actions { margin-inline-start: 0.6rem; }

.icon-btn,
.lang-switch {
  min-width: 44px;
  min-height: 44px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  border-radius: 12px;
  cursor: pointer;
  text-decoration: none;
  transition: transform 180ms var(--ease), border-color 180ms var(--ease);
}

.icon-btn:hover,
.lang-switch:hover,
.btn:hover,
.chip:hover { transform: translateY(-1px); }

.icon { width: 20px; height: 20px; }
.icon-sun { display: none; }
html[data-theme="dark"] .icon-sun { display: block; }
html[data-theme="dark"] .icon-moon { display: none; }
.icon-close { display: none; }
.menu-toggle[aria-expanded="true"] .icon-menu { display: none; }
.menu-toggle[aria-expanded="true"] .icon-close { display: block; }

.nav-mobile {
  display: none;
  border-top: 1px solid var(--line);
  padding: 0.5rem 1rem 1rem;
}

.hero { position: relative; padding: 3.2rem 0 2rem; }
.hero-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(circle at 30% 30%, black, transparent 72%);
  opacity: 0.35;
  pointer-events: none;
}

.hero-grid,
.split,
.contact-grid {
  display: grid;
  gap: 2.5rem;
}

.hero-grid { grid-template-columns: 1.15fr 0.85fr; align-items: center; }

.kicker {
  margin: 0 0 0.6rem;
  color: var(--teal);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

html[dir="rtl"] .kicker { letter-spacing: 0.06em; text-transform: none; }

.kicker.light { color: color-mix(in srgb, var(--teal) 42%, var(--on-cta)); }

h1, h2, h3 {
  font-family: var(--font-display);
  line-height: 1.2;
  margin: 0 0 0.75rem;
  letter-spacing: -0.03em;
}

html[dir="rtl"] h1,
html[dir="rtl"] h2,
html[dir="rtl"] h3 { letter-spacing: 0; }

h1 { font-size: clamp(2.2rem, 5vw, 4.4rem); font-weight: 700; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }
h3 { font-size: 1.15rem; }

.lead { font-size: 1.18rem; max-width: 40rem; color: var(--ink-soft); }
.muted { color: var(--muted); }
.meta-line { color: var(--muted); font-size: 0.92rem; }

.hero-actions,
.section-cta { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 1.6rem; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0.7rem 1.15rem;
  border-radius: 999px;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition: transform 180ms var(--ease), background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.btn-primary { background: var(--ink); color: var(--paper); }
.btn-ghost { background: var(--card); border-color: var(--line); }
.btn-text { background: transparent; padding-inline: 0.4rem; }
.btn-on-dark { background: var(--on-cta); color: var(--cta); }

.portrait {
  margin: 0;
  max-width: 26rem;
  justify-self: center;
  width: 100%;
}
.portrait-frame {
  position: relative;
  padding: 0.4rem;
  border-radius: 28px;
  background:
    linear-gradient(165deg,
      color-mix(in srgb, var(--teal) 38%, var(--card)),
      color-mix(in srgb, var(--gold) 14%, var(--card)) 46%,
      var(--card));
  box-shadow:
    var(--shadow),
    0 0 0 1px color-mix(in srgb, var(--teal) 18%, var(--line));
}

.portrait-frame picture {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 22px;
}

.portrait-frame img {
  width: 100%;
  height: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  object-position: center;
  border-radius: 22px;
  background: #d6d6d6;
}

.portrait figcaption { margin-top: 1rem; }
.portrait figcaption strong,
.portrait figcaption span { display: block; }
.portrait figcaption span { color: var(--muted); font-size: 0.95rem; }

.stat-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.9rem;
  margin: 2.4rem 0 0;
  padding: 0;
  list-style: none;
}

.stat-card,
.theme-card,
.paper-card,
.panel,
.grant-card,
.thesis-card,
.course-card,
.workshop-card,
.contact-form {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.3rem;
  box-shadow: var(--shadow);
}

.stat-card strong {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  line-height: 1.1;
}

.section { padding: 4.2rem 0; }
.section-alt { background: color-mix(in srgb, var(--paper-2) 70%, transparent); }
.page-hero { padding: 3.2rem 0 1rem; }
.section-head { max-width: 40rem; margin-bottom: 1.8rem; }

.theme-grid,
.grant-list,
.thesis-list { display: grid; gap: 1rem; }
.theme-grid { grid-template-columns: 1fr 1fr; }

.theme-index {
  display: inline-block;
  margin-bottom: 0.6rem;
  color: var(--gold);
  font-family: var(--font-display);
  font-weight: 700;
}

.paper-stack { display: grid; gap: 1rem; }
.paper-meta { display: flex; gap: 0.6rem; align-items: center; margin-bottom: 0.5rem; }
.cite-pill,
.role-pill,
.kind {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 0.65rem;
  border-radius: 999px;
  background: color-mix(in srgb, var(--teal) 12%, var(--card));
  color: var(--teal-deep);
  font-size: 0.8rem;
  font-weight: 600;
}

.venue { color: var(--teal); font-weight: 600; margin: 0.35rem 0 0; }
.honor-list { display: grid; gap: 0.85rem; }
.honor-list li,
.profile-links a,
.contact-mail {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
}

.honor-list .icon { color: var(--gold); flex-shrink: 0; margin-top: 0.2rem; }
.plain-list { display: grid; gap: 0.45rem; margin-bottom: 1rem; }
.plain-list li::before { content: ""; }

.split { grid-template-columns: 1fr 1fr; align-items: start; }

.cta-band {
  margin: 0 0 3rem;
  background:
    radial-gradient(circle at 12% 0%, color-mix(in srgb, var(--teal) 22%, transparent), transparent 42%),
    var(--cta);
  color: var(--on-cta);
}

.cta-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
  padding: 3rem 0;
}

.timeline { list-style: none; margin: 1.5rem 0 0; padding: 0; display: grid; gap: 1.4rem; }
.timeline-item {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 1.2rem;
  padding-bottom: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.when { color: var(--gold); font-weight: 700; }
.thesis { margin-top: 0.6rem; }

.pub-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.2rem;
}

.filter-group { display: flex; flex-wrap: wrap; gap: 0.45rem; }
.chip {
  min-height: 44px;
  padding: 0 1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}

.chip.is-active { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.search-field {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0 0.9rem;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  min-width: min(100%, 280px);
}

.search-field input,
.contact-form input,
.contact-form textarea {
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--ink);
  outline: none;
}

.pub-item {
  display: grid;
  grid-template-columns: 5rem 1fr;
  gap: 1rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
}

.pub-item h2 { font-size: 1.12rem; letter-spacing: 0; }
.pub-year { font-weight: 700; color: var(--gold); }
.pub-item[hidden] { display: none; }

.course-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0.8rem; }
.course-card span { display: block; color: var(--gold); font-weight: 700; margin-bottom: 0.35rem; }
.workshop-list { display: grid; gap: 0.9rem; }

.contact-grid { grid-template-columns: 0.85fr 1.15fr; }
.contact-aside { display: grid; gap: 1rem; }
.contact-form { display: grid; gap: 0.9rem; }
.contact-form label span { display: block; margin-bottom: 0.35rem; font-weight: 600; }
.contact-form input,
.contact-form textarea {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.8rem 0.9rem;
  background: var(--paper);
}

.form-alert {
  padding: 0.8rem 1rem;
  border-radius: 12px;
  margin: 0;
}

.form-alert.is-success { background: color-mix(in srgb, var(--ok) 16%, var(--card)); }
.form-alert.is-error { background: color-mix(in srgb, var(--danger) 14%, var(--card)); }
.hp { position: absolute; left: -9999px; height: 0; overflow: hidden; }

.profile-links a,
.contact-mail { text-decoration: none; min-height: 44px; align-items: center; }
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2.4rem 0 1.4rem;
}
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 1.5rem; }
.footer-name { font-family: var(--font-display); font-size: 1.3rem; font-weight: 700; margin: 0 0 0.3rem; }
.footer-label { font-weight: 700; margin: 0 0 0.4rem; }
.footer-links,
.footer-grid a { display: grid; gap: 0.25rem; text-decoration: none; }
.footer-base { margin-top: 1.6rem; color: var(--muted); font-size: 0.92rem; }
.not-found { min-height: 50vh; }

:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 3px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  animation: rise 520ms var(--ease) forwards;
  animation-delay: var(--delay, 0ms);
}

@keyframes rise {
  to { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; animation: none; }
  .icon-btn:hover, .lang-switch:hover, .btn:hover, .chip:hover,
  .theme-card:hover, .paper-card:hover, .grant-card:hover, .thesis-card:hover, .course-card:hover { transform: none; }
}

@media (min-width: 961px) {
  .menu-toggle,
  .nav-mobile { display: none !important; }
}

.theme-card,
.paper-card,
.grant-card,
.thesis-card,
.course-card,
.stat-card {
  transition: transform 200ms var(--ease), border-color 200ms var(--ease);
}

.theme-card:hover,
.paper-card:hover,
.grant-card:hover,
.thesis-card:hover,
.course-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--teal) 40%, var(--line));
}

@media (max-width: 960px) {
  .nav-desktop { display: none; }
  .nav-mobile:not([hidden]) { display: block; }
  .hero-grid,
  .split,
  .contact-grid,
  .theme-grid,
  .course-grid,
  .footer-grid { grid-template-columns: 1fr; }
  .stat-row { grid-template-columns: 1fr 1fr; }
  .timeline-item,
  .pub-item { grid-template-columns: 1fr; }
  .cta-inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 560px) {
  .brand-text span { display: none; }
  .stat-row { grid-template-columns: 1fr; }
  h1 { font-size: 2.15rem; }
}