/* Tanay Chitlur — portfolio
   Palette: paper white / ink navy / ECG crimson */

:root {
  --paper: #fbfbf9;
  --ink: #1a2332;
  --muted: #5c6672;
  --crimson: #c6303e;
  --hairline: #e4e2dc;
  --wash: #f3f2ee;
  --maxw: 46rem;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Sans", -apple-system, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ink); text-decoration-color: var(--hairline); text-underline-offset: 3px; }
a:hover { color: var(--crimson); text-decoration-color: var(--crimson); }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--crimson);
  outline-offset: 3px;
  border-radius: 2px;
}

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 1.25rem; }

/* Nav */
header.site {
  border-bottom: 1px solid var(--hairline);
}
header.site .wrap {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}
.wordmark {
  font-weight: 650;
  letter-spacing: -0.01em;
  text-decoration: none;
}
nav.main { display: flex; gap: 1.4rem; flex-wrap: wrap; }
nav.main a { text-decoration: none; color: var(--muted); font-size: 0.95rem; }
nav.main a:hover { color: var(--crimson); }

/* Hero */
.hero { padding: 4.5rem 0 3rem; }
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.1;
  margin: 0 0 0.4rem;
}
.hero p.lede {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 38rem;
  margin: 1.4rem 0 0;
}
.trace { display: block; margin-top: 1rem; width: min(26rem, 100%); height: 44px; }
.trace path {
  fill: none;
  stroke: var(--crimson);
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
@media (prefers-reduced-motion: no-preference) {
  .trace path {
    stroke-dasharray: 620;
    stroke-dashoffset: 620;
    animation: draw 1.6s ease-out 0.2s forwards;
  }
  @keyframes draw { to { stroke-dashoffset: 0; } }
}

/* Sections */
section { padding: 2.6rem 0; }
section + section { border-top: 1px solid var(--hairline); }
h2 {
  font-size: 1.35rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  margin: 0 0 1.4rem;
}

/* About */
.about-grid {
  display: grid;
  grid-template-columns: 150px 1fr;
  gap: 2rem;
  align-items: start;
}
.about-grid img {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--hairline);
}
.about-grid p { margin: 0 0 1rem; }
.about-grid p:last-child { margin-bottom: 0; }
@media (max-width: 560px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* Research list */
ol.pubs { list-style: none; margin: 0; padding: 0; }
ol.pubs li {
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 1.2rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--hairline);
}
ol.pubs li:first-child { border-top: 1px solid var(--hairline); }
.pub-year { color: var(--muted); font-variant-numeric: tabular-nums; }
.pub-title {
  font-weight: 600;
  text-decoration: none;
  display: inline-block;
  line-height: 1.4;
}
.pub-venue { color: var(--muted); font-size: 0.95rem; margin-top: 0.2rem; }
.award {
  display: inline-block;
  margin-top: 0.45rem;
  font-size: 0.85rem;
  color: var(--crimson);
  border: 1px solid currentColor;
  border-radius: 999px;
  padding: 0.05rem 0.6rem;
}

/* Contact */
.contact-links { display: flex; flex-wrap: wrap; gap: 0.8rem 1.8rem; align-items: center; }
button.reveal {
  font: inherit;
  color: var(--ink);
  background: var(--wash);
  border: 1px solid var(--hairline);
  border-radius: 6px;
  padding: 0.45rem 1rem;
  cursor: pointer;
}
button.reveal:hover { border-color: var(--crimson); color: var(--crimson); }

/* Project pages */
.project-head { padding: 3.2rem 0 0.6rem; }
.crumb { font-size: 0.92rem; color: var(--muted); text-decoration: none; }
.crumb:hover { color: var(--crimson); }
.project-head h1 {
  font-size: clamp(1.7rem, 4.5vw, 2.3rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0.9rem 0 0.5rem;
}
.project-meta { color: var(--muted); margin: 0; }
.project-body { padding: 1.6rem 0 3rem; }
.project-body p { max-width: 40rem; }

.doc-list { list-style: none; margin: 2rem 0 0; padding: 0; display: grid; gap: 0.7rem; }
.doc-list a {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.85rem 1.1rem;
  background: var(--wash);
  border: 1px solid var(--hairline);
  border-radius: 8px;
  text-decoration: none;
}
.doc-list a:hover { border-color: var(--crimson); }
.doc-kind { font-size: 0.85rem; color: var(--crimson); min-width: 5.5rem; }
.ext-links { margin-top: 1.6rem; font-size: 0.95rem; }
.ext-links a { margin-right: 1.6rem; }

/* Footer */
footer.site {
  border-top: 1px solid var(--hairline);
  color: var(--muted);
  font-size: 0.9rem;
}
footer.site .wrap { padding-top: 1.4rem; padding-bottom: 2rem; }

/* --- v2: research figure --- */
.ecg-figure { margin: 1.6rem 0 2.4rem; }
.ecg-legend {
  display: flex; flex-wrap: wrap; gap: 0.5rem 2rem;
  font-size: 0.8rem; letter-spacing: 0.07em; text-transform: uppercase;
  color: var(--muted); margin-bottom: 0.7rem;
}
.ecg-legend span { display: inline-flex; align-items: center; gap: 0.55rem; }
.swatch { display: inline-block; width: 1.6rem; height: 3px; border-radius: 2px; }
.swatch.navy { background: var(--ink); }
.swatch.amber { background: #b9821d; }
.ecg-figure figcaption {
  margin-top: 0.9rem; color: var(--muted); font-size: 0.95rem;
  max-width: 38rem; line-height: 1.6;
}

/* --- v2: richer research entries --- */
ol.pubs li { grid-template-columns: 4.6rem 1fr; padding: 1.7rem 0; }
.pub-year { display: flex; flex-direction: column; gap: 0.35rem; }
.pub-mark { width: 26px; height: 14px; }
.pub-mark path {
  fill: none; stroke: var(--ink); stroke-width: 1.8;
  stroke-linecap: round; stroke-linejoin: round;
}
a.pub-title { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.01em; }
a.pub-title:hover { color: var(--crimson); }
.pub-eyebrow {
  margin-top: 0.45rem; font-size: 0.78rem; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--muted);
}
.pub-eyebrow .award-inline { color: var(--crimson); font-weight: 650; }
.pub-summary { margin: 0.7rem 0 0.9rem; max-width: 40rem; color: var(--ink); }
.pub-links {
  font-size: 0.82rem; letter-spacing: 0.07em; text-transform: uppercase;
  display: flex; flex-wrap: wrap; gap: 0.4rem 1.6rem;
}
.pub-links a { color: var(--muted); text-decoration-color: var(--hairline); }
.pub-links a.primary { color: var(--ink); font-weight: 650; text-decoration-color: var(--ink); }
.pub-links a:hover, .pub-links a.primary:hover { color: var(--crimson); text-decoration-color: var(--crimson); }
@media (max-width: 480px) {
  ol.pubs li { grid-template-columns: 1fr; gap: 0.5rem; }
  .pub-year { flex-direction: row; align-items: center; }
}

/* --- v3: update bar --- */
.update-bar {
  background: #fbf1f1;
  border-bottom: 1px solid #f0dcdc;
  font-size: 0.9rem;
}
.update-bar .wrap { padding-top: 0.55rem; padding-bottom: 0.55rem; }
.update-label {
  color: var(--crimson);
  font-weight: 650;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-right: 0.7rem;
}

/* --- v4: awards + tools --- */
ol.awards { list-style: none; margin: 0; padding: 0; }
ol.awards li {
  display: grid; grid-template-columns: 4.6rem 1fr; gap: 1.2rem;
  padding: 1.05rem 0; border-bottom: 1px solid var(--hairline);
}
ol.awards li:first-child { border-top: 1px solid var(--hairline); }
.award-year { color: var(--muted); font-variant-numeric: tabular-nums; }
ol.awards strong { font-weight: 650; }
@media (max-width: 480px) {
  ol.awards li { grid-template-columns: 1fr; gap: 0.25rem; }
}

.tools-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem;
}
.tools-grid h3 {
  font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted); font-weight: 650; margin: 0 0 0.6rem;
}
.tools-grid ul { list-style: none; margin: 0; padding: 0; }
.tools-grid li {
  padding: 0.45rem 0; border-bottom: 1px solid var(--hairline); font-size: 0.98rem;
}
@media (max-width: 720px) { .tools-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 400px) { .tools-grid { grid-template-columns: 1fr; } }

#contact > p { max-width: 34rem; margin-top: 0; }

/* --- v5: mobile polish --- */
.ecg-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.ecg-scroll svg { min-width: 640px; }
.scroll-hint { display: none; }

.doc-list a { flex-wrap: wrap; }
.contact-links a { overflow-wrap: anywhere; }

@media (max-width: 640px) {
  /* header: wordmark on top, nav in a clean row beneath — no awkward wrap */
  header.site .wrap {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.4rem;
    padding-top: 0.9rem;
    padding-bottom: 0.9rem;
  }
  nav.main { gap: 1.15rem; }
  nav.main a { font-size: 0.9rem; }

  .hero { padding: 3rem 0 2.2rem; }
  section { padding: 2.1rem 0; }

  .update-bar { font-size: 0.82rem; line-height: 1.5; }

  .scroll-hint {
    display: block;
    margin-top: 0.5rem;
    font-size: 0.78rem;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    color: var(--muted);
  }

  .pub-links { gap: 0.4rem 1.2rem; }
  .project-head { padding-top: 2.2rem; }
}

/* --- v6: clickable-title affordance --- */
a.pub-title {
  text-decoration: underline;
  text-decoration-color: #c3bdb2;
  text-decoration-thickness: 1.5px;
  text-underline-offset: 5px;
}
a.pub-title:hover { text-decoration-color: var(--crimson); }