/* ---------------------------------------------------------------
   soumildatta.github.io - hand-rolled, no template
   --------------------------------------------------------------- */

:root {
  --bg: #faf8f4;
  --bg-raised: #ffffff;
  --ink: #1a1712;
  --muted: #6e675c;
  --faint: #99917f;
  --accent: #b3202c;
  --accent-soft: rgba(179, 32, 44, 0.08);
  --border: rgba(26, 23, 18, 0.14);
  --border-strong: rgba(26, 23, 18, 0.28);
  --gold: #8a6d1f;
  --gold-soft: rgba(196, 158, 50, 0.14);
  --venue: #3a6ea5;
  --venue-soft: rgba(58, 110, 165, 0.10);
  --shadow: 0 1px 2px rgba(26, 23, 18, 0.04), 0 8px 24px rgba(26, 23, 18, 0.06);
  --grid-dot: rgba(26, 23, 18, 0.10);
}

[data-theme="dark"] {
  --bg: #100f0d;
  --bg-raised: #191713;
  --ink: #ece7dd;
  --muted: #a49b8b;
  --faint: #766e5f;
  --accent: #ff5a4e;
  --accent-soft: rgba(255, 90, 78, 0.10);
  --border: rgba(236, 231, 221, 0.14);
  --border-strong: rgba(236, 231, 221, 0.30);
  --gold: #d9b545;
  --gold-soft: rgba(217, 181, 69, 0.12);
  --venue: #8ab4dd;
  --venue-soft: rgba(138, 180, 221, 0.12);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  --grid-dot: rgba(236, 231, 221, 0.09);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #100f0d;
    --bg-raised: #191713;
    --ink: #ece7dd;
    --muted: #a49b8b;
    --faint: #766e5f;
    --accent: #ff5a4e;
    --accent-soft: rgba(255, 90, 78, 0.10);
    --border: rgba(236, 231, 221, 0.14);
    --border-strong: rgba(236, 231, 221, 0.30);
    --gold: #d9b545;
    --gold-soft: rgba(217, 181, 69, 0.12);
    --venue: #8ab4dd;
    --venue-soft: rgba(138, 180, 221, 0.12);
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
    --grid-dot: rgba(236, 231, 221, 0.09);
  }
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.25s ease, color 0.25s ease;
}

::selection { background: var(--accent); color: var(--bg); }

h1, h2, h3, h4 {
  font-family: "Space Grotesk", "Inter", sans-serif;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

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

.mono {
  font-family: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

.wrap {
  max-width: 62rem;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ---- nav ---- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  padding: 0.8rem 1.5rem;
  max-width: 62rem;
  margin: 0 auto;
}

.nav-name {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--ink);
  margin-right: auto;
  white-space: nowrap;
}
.nav-name:hover { text-decoration: none; color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  flex-wrap: wrap;
}

.nav-links a {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}
.nav-links a:hover { color: var(--accent); text-decoration: none; }

.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--muted);
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--border-strong); }
.theme-toggle svg { width: 15px; height: 15px; }
.icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}

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

.hero {
  position: relative;
  padding: 4.5rem 0 4rem;
  background-image: radial-gradient(var(--grid-dot) 1px, transparent 1px);
  background-size: 22px 22px;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 40%, var(--bg));
  pointer-events: none;
}

.hero .wrap {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 3rem;
  align-items: center;
}

.hero-eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero h1 {
  font-size: clamp(2.6rem, 6vw, 4rem);
  font-weight: 700;
  margin-bottom: 1.1rem;
}

.hero-tagline {
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 1.1rem;
  max-width: 32ch;
  line-height: 1.35;
}
.hero-tagline .break-word { color: var(--accent); }

.hero-lede {
  color: var(--muted);
  max-width: 54ch;
  margin-bottom: 1.6rem;
}
.hero-lede a { color: var(--ink); border-bottom: 1px solid var(--border-strong); }
.hero-lede a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.hero-links { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.pill-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  padding: 0.42rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--ink);
  background: var(--bg-raised);
  transition: border-color 0.15s, color 0.15s, transform 0.15s;
}
.pill-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
  transform: translateY(-1px);
}
.pill-link svg { width: 14px; height: 14px; }

/* ---- detection-box photo ---- */

.detect { width: 250px; }

.detect-frame {
  position: relative;
  padding: 10px;
}

.detect img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 4px;
  filter: saturate(0.92);
}

.detect .corner {
  position: absolute;
  width: 15px;
  height: 15px;
  border: 2.5px solid var(--accent);
}
.detect .tl { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.detect .tr { top: 0; right: 0; border-left: 0; border-bottom: 0; }
.detect .bl { bottom: 0; left: 0; border-right: 0; border-top: 0; }
.detect .br { bottom: 0; right: 0; border-left: 0; border-top: 0; }

.detect-label {
  position: absolute;
  top: -12px;
  left: 10px;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  font-weight: 500;
  background: var(--accent);
  color: var(--bg);
  padding: 0.15rem 0.5rem;
  border-radius: 3px;
  white-space: nowrap;
}

.detect-hint {
  margin-top: 0.9rem;
  text-align: center;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.68rem;
  color: var(--faint);
}

/* ---- sections ---- */

section { padding: 3.2rem 0; }
section + section { border-top: 1px solid var(--border); }

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin-bottom: 1.8rem;
}

.sec-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  color: var(--accent);
}

.sec-head h2 {
  font-size: 1.55rem;
  font-weight: 600;
}

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

.news-list { list-style: none; }

.news-list li {
  display: grid;
  grid-template-columns: 7.5rem 1fr;
  gap: 1.2rem;
  padding: 0.65rem 0;
  border-bottom: 1px dashed var(--border);
}
.news-list li:last-child { border-bottom: 0; }

.news-date {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--faint);
  padding-top: 0.2rem;
}

.news-text { color: var(--muted); }
.news-text strong { color: var(--ink); font-weight: 600; }

/* ---- research cards ---- */

.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.card {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--bg-raised);
  padding: 1.4rem 1.3rem;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}

.card .card-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: var(--accent);
  display: block;
  margin-bottom: 0.8rem;
}

.card h3 {
  font-size: 1.08rem;
  font-weight: 600;
  margin-bottom: 0.55rem;
}

.card p {
  font-size: 0.92rem;
  color: var(--muted);
  margin-bottom: 0.9rem;
}

.tags { display: flex; flex-wrap: wrap; gap: 0.4rem; }

.tag {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.68rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.12rem 0.45rem;
}

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

.pub-list { list-style: none; }

.pub {
  padding: 1.3rem 1.2rem;
  margin: 0 -1.2rem;
  border-radius: 12px;
  transition: background-color 0.15s;
}
.pub:hover { background: var(--accent-soft); }
.pub + .pub { margin-top: 0.2rem; }

.pub-title {
  font-family: "Space Grotesk", sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ink);
  display: inline;
}
a.pub-title:hover { color: var(--accent); text-decoration: none; }

.pub-authors {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 0.35rem;
}
.pub-authors strong { color: var(--ink); font-weight: 600; }

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.6rem;
  align-items: center;
}

.badge {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.7rem;
  font-weight: 500;
  padding: 0.18rem 0.55rem;
  border-radius: 4px;
  letter-spacing: 0.02em;
}
.badge-venue { background: var(--venue-soft); color: var(--venue); }
.badge-award { background: var(--gold-soft); color: var(--gold); border: 1px solid var(--gold); }
.badge-review { border: 1px dashed var(--border-strong); color: var(--muted); }

/* ---- awards ---- */

.award-list { list-style: none; }

.award-list li {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--border);
}
.award-list li:last-child { border-bottom: 0; }

.award-list .marker { color: var(--gold); flex-shrink: 0; }
.award-list a { color: var(--ink); border-bottom: 1px solid var(--border-strong); }
.award-list a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.award-date {
  margin-left: auto;
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: var(--faint);
  white-space: nowrap;
  padding-left: 1rem;
}

/* ---- service ---- */

.service-intro { color: var(--muted); margin-bottom: 1.2rem; max-width: 60ch; }

.service-grid { display: flex; flex-wrap: wrap; gap: 0.6rem; }

.venue-chip {
  border: 1px solid var(--border);
  background: var(--bg-raised);
  border-radius: 10px;
  padding: 0.6rem 0.9rem;
}

.venue-chip .v-name {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 600;
  font-size: 0.95rem;
}

.venue-chip .v-years {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.72rem;
  color: var(--accent);
  margin-left: 0.5rem;
}

.venue-chip .v-full {
  display: block;
  font-size: 0.78rem;
  color: var(--faint);
  margin-top: 0.1rem;
}

/* ---- teaching summary / prose pages ---- */

.prose { max-width: 46rem; }
.prose p { color: var(--muted); margin-bottom: 1rem; }
.prose p strong, .prose li strong { color: var(--ink); }
.prose h3 {
  font-size: 1.15rem;
  margin: 1.8rem 0 0.7rem;
}
.prose ul { list-style: none; margin-bottom: 1rem; }
.prose ul li {
  color: var(--muted);
  padding: 0.3rem 0 0.3rem 1.2rem;
  position: relative;
}
.prose ul li::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
  top: 0.45rem;
}

.page-header { padding: 3.5rem 0 0.5rem; }
.page-header h1 { font-size: clamp(2rem, 5vw, 2.8rem); margin-bottom: 0.6rem; }
.page-header .hero-eyebrow { margin-bottom: 0.8rem; }
.page-header p.sub { color: var(--muted); max-width: 56ch; }

/* ---- cv timeline ---- */

.cv-block { margin-bottom: 0.6rem; }

.cv-item {
  display: grid;
  grid-template-columns: 10rem 1fr;
  gap: 1.4rem;
  padding: 1rem 0;
  border-bottom: 1px dashed var(--border);
}
.cv-item:last-child { border-bottom: 0; }

.cv-when {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.76rem;
  color: var(--faint);
  padding-top: 0.25rem;
}

.cv-what h3 { font-size: 1.02rem; font-weight: 600; margin-bottom: 0.25rem; }
.cv-what p { color: var(--muted); font-size: 0.93rem; margin-bottom: 0.2rem; }
.cv-what a { color: var(--ink); border-bottom: 1px solid var(--border-strong); }
.cv-what a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

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

footer {
  border-top: 1px solid var(--border);
  padding: 2.6rem 0 3rem;
}

.foot-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  justify-content: space-between;
}

.foot-note {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.75rem;
  color: var(--faint);
}
.foot-note a { color: var(--muted); }

/* ---- reveal animation ---- */

@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(14px);
    animation: rise 0.6s ease forwards;
  }
  .reveal:nth-child(2) { animation-delay: 0.08s; }
  @keyframes rise {
    to { opacity: 1; transform: none; }
  }
}

/* ---- responsive ---- */

@media (max-width: 720px) {
  .hero .wrap {
    grid-template-columns: 1fr;
    gap: 2.4rem;
  }
  .hero { padding-top: 3rem; }
  .hero .wrap > div:has(.detect) { order: -1; }
  .detect { width: 200px; margin: 0 auto; }
  .cards { grid-template-columns: 1fr; }
  .news-list li { grid-template-columns: 1fr; gap: 0.1rem; }
  .cv-item { grid-template-columns: 1fr; gap: 0.2rem; }
  .award-date { display: none; }
  .nav-inner { flex-wrap: wrap; gap: 0.7rem; row-gap: 0.4rem; padding: 0.7rem 1.2rem; }
  .nav-links { gap: 0.85rem; }
  .pub { margin: 0; padding: 1.1rem 0.9rem; }
}