/* ============================================================
   Shaswata Mitra — academic portfolio
   Theme ported from jojo (github.com/shaswata09/jojo):
   shadcn/ui NEUTRAL, dark-default. Neutral greys, a monochrome
   primary, no hue in the chrome. Surfaces are opaque; depth is a
   hairline border plus a small shadow. WCAG ratios carried over
   from jojo's measured comments.

   jojo is a dense application (14px body). This is a reading
   document, so the scale is lifted one step at the base and gains
   display steps above --text-2xl. Every other value is jojo's.
   ============================================================ */

/* ---------- LIGHT — shadcn/ui neutral ---------- */
:root,
html[data-theme="light"] {
  --page: #f5f5f5;
  --panel: #ffffff;
  --well: #f5f5f5;
  --raised: #ffffff;
  --hairline: #e5e5e5;
  --hairline-strong: #8a8a8a;
  --row-hover: #f0f0f0;

  --text-1: #0a0a0a; /* 19.80:1 on panel */
  --text-2: #525252; /*  7.81:1 on panel */
  --text-3: #696969; /*  5.49:1 on panel */

  --accent: #171717; /* 17.93:1 on panel */
  --accent-fg: #fafafa;
  --accent-soft: #ebebeb;
  --accent-border: #a3a3a3;

  --info: #3b6fbf; /* 5.34:1 on panel */
  --info-soft: #eff4fc;
  --info-border: #cbdcf3;
  --success: #15803d; /* 5.02:1 */
  --success-soft: #f0fdf4;
  --success-border: #bbf7d0;
  --warning: #a16207; /* 4.92:1 */
  --warning-soft: #fefce8;
  --warning-border: #fde68a;
  --danger: #c81e1e; /* 5.74:1 */
  --danger-soft: #fef2f2;
  --danger-border: #fecaca;

  --kw-cyan: #0e7490;
  --kw-cyan-soft: #ecfeff;
  --kw-cyan-border: #a5f3fc;
  --kw-pink: #be185d;
  --kw-pink-soft: #fdf2f8;
  --kw-pink-border: #fbcfe8;
  --kw-violet: #6d28d9;
  --kw-violet-soft: #f5f3ff;
  --kw-violet-border: #ddd6fe;

  --series-1: #4f9dc9;
  --series-2: #c96b64;
  --series-3: #cea441;
  --series-4: #449970;
  --series-5: #8a6bbf;

  --scrollbar-thumb: rgba(10, 10, 10, 0.32);
  --scrollbar-thumb-hover: rgba(10, 10, 10, 0.46);
  --scrim: rgba(0, 0, 0, 0.45);
  --shadow-panel: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-raised: 0 8px 24px rgba(0, 0, 0, 0.1), 0 2px 6px rgba(0, 0, 0, 0.06);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.6);
  color-scheme: light;
}

/* ---------- DARK — shadcn/ui neutral (separately chosen) ---------- */
html[data-theme="dark"] {
  --page: #0a0a0a;
  --panel: #1f1f1f; /* 1.20:1 on page */
  --well: #171717; /* recessed 1.09:1 under panel */
  --raised: #1f1f1f;
  --hairline: #333333; /* 1.30:1 on panel */
  --hairline-strong: #6b6b6b; /* 3.09:1 on panel */
  --row-hover: #2a2a2a;

  --text-1: #fafafa; /* 15.79:1 on panel */
  --text-2: #d4d4d4; /* 11.12:1 on panel */
  --text-3: #a1a1a1; /*  6.38:1 on panel */

  --accent: #fafafa; /* monochrome primary, inverted */
  --accent-fg: #171717;
  --accent-soft: #303030;
  --accent-border: #5a5a5a;

  --info: #7ba5e8; /* 7.31:1 on panel */
  --info-soft: #16202e;
  --info-border: #2a3c55;
  --success: #4ade80; /* 10.29:1 */
  --success-soft: #12241a;
  --success-border: #1e4030;
  --warning: #fbbf24; /* 10.74:1 */
  --warning-soft: #262010;
  --warning-border: #453714;
  --danger: #ff6467; /* 6.21:1 */
  --danger-soft: #2a1515;
  --danger-border: #4a2020;

  --kw-cyan: #22d3ee;
  --kw-cyan-soft: #0f2a30;
  --kw-cyan-border: #17414a;
  --kw-pink: #f472b6;
  --kw-pink-soft: #2b1723;
  --kw-pink-border: #4a2038;
  --kw-violet: #a78bfa;
  --kw-violet-soft: #1e1a33;
  --kw-violet-border: #33294d;

  --series-1: #3e96c6;
  --series-2: #cf6a62;
  --series-3: #b18d39;
  --series-4: #45a075;
  --series-5: #9d84d4;

  --scrollbar-thumb: rgba(250, 250, 250, 0.36);
  --scrollbar-thumb-hover: rgba(250, 250, 250, 0.5);
  --scrim: rgba(0, 0, 0, 0.82);
  --shadow-panel: 0 1px 2px rgba(0, 0, 0, 0.5);
  --shadow-raised: 0 8px 24px rgba(0, 0, 0, 0.6), 0 2px 6px rgba(0, 0, 0, 0.4);
  --shadow-inset: inset 0 1px 0 rgba(255, 255, 255, 0.04);
  color-scheme: dark;
}

/* ---------- Scale, tracking, radii ----------
   jojo binds tracking to the SIZE, not the tag: optical letter-spacing
   runs the other way from size, so it belongs on the step. */
:root {
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --text-xs: 0.6875rem; /* 11px — labels, meta */
  --text-sm: 0.8125rem; /* 13px — dense list body */
  --text-base: 0.9375rem; /* 15px — body (lifted from jojo's 14) */
  --text-lg: 1.0625rem; /* 17px — panel titles */
  --text-xl: 1.3125rem; /* 21px — subsection titles */
  --text-2xl: 1.75rem; /* 28px — stat figures */
  --text-3xl: 2.25rem; /* 36px — section headings */
  --text-4xl: 3rem; /* 48px — hero */
  --text-5xl: 4rem; /* 64px — hero, wide */

  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  --maxw: 1296px; /* was 1080 — widened 10% on each side */
  --gutter: 24px;
  --nav-h: 56px;
}

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

* {
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  background: var(--page);
  color: var(--text-1);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.6;
  font-feature-settings: "cv02", "cv03", "cv04", "cv11";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

::selection {
  background: var(--accent-soft);
  color: var(--text-1);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 99px;
  border: 2px solid transparent;
  background-clip: content-box;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
  background-clip: content-box;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-fg);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  transform: translateY(-200%);
  transition: transform 0.16s ease;
}
.skip-link:focus {
  transform: translateY(0);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Shared primitives
   ============================================================ */
.wrap {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-3);
  font-family: var(--font-mono);
}

.section {
  padding-block: 72px;
  border-top: 1px solid var(--hairline);
}

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.section__title {
  font-size: var(--text-3xl);
  line-height: 1.1;
  letter-spacing: -0.025em;
  font-weight: 650;
}

.section__note {
  font-size: var(--text-sm);
  color: var(--text-3);
}

.panel {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-panel);
}

/* Chips — a --*-soft fill with its matching border, per jojo */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border-radius: 99px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.01em;
  font-family: var(--font-mono);
  background: var(--accent-soft);
  border: 1px solid var(--hairline);
  color: var(--text-2);
  white-space: nowrap;
}
.chip--info {
  background: var(--info-soft);
  border-color: var(--info-border);
  color: var(--info);
}
.chip--success {
  background: var(--success-soft);
  border-color: var(--success-border);
  color: var(--success);
}
.chip--warning {
  background: var(--warning-soft);
  border-color: var(--warning-border);
  color: var(--warning);
}
.chip--violet {
  background: var(--kw-violet-soft);
  border-color: var(--kw-violet-border);
  color: var(--kw-violet);
}
.chip--cyan {
  background: var(--kw-cyan-soft);
  border-color: var(--kw-cyan-border);
  color: var(--kw-cyan);
}
.chip--pink {
  background: var(--kw-pink-soft);
  border-color: var(--kw-pink-border);
  color: var(--kw-pink);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease,
    transform 0.15s ease;
  font-family: inherit;
  white-space: nowrap;
}
.btn:active {
  transform: translateY(1px);
}
.btn--primary {
  background: var(--accent);
  color: var(--accent-fg);
}
.btn--primary:hover {
  opacity: 0.88;
}
.btn--ghost {
  background: var(--panel);
  border-color: var(--hairline-strong);
  color: var(--text-1);
}
.btn--ghost:hover {
  background: var(--row-hover);
}
.btn svg {
  width: 15px;
  height: 15px;
  flex: none;
}

/* ============================================================
   Nav
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  background: color-mix(in srgb, var(--page) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}
.nav[data-stuck="true"] {
  border-bottom-color: var(--hairline);
}

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.nav__brand {
  display: flex;
  align-items: center;
  gap: 9px;
  font-weight: 650;
  font-size: var(--text-base);
  letter-spacing: -0.01em;
  flex: none;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 2px;
  margin-left: auto;
  overflow-x: auto;
  scrollbar-width: none;
}
.nav__links::-webkit-scrollbar {
  display: none;
}

.nav__link {
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-3);
  transition:
    color 0.15s ease,
    background 0.15s ease;
  white-space: nowrap;
}
.nav__link:hover {
  color: var(--text-1);
  background: var(--row-hover);
}
.nav__link[aria-current="true"],
.nav__link[aria-current="page"] {
  color: var(--text-1);
  background: var(--accent-soft);
}

.nav__actions {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: none;
}

.icon-btn {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  border-radius: var(--radius-md);
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--text-2);
  cursor: pointer;
  transition:
    background 0.15s ease,
    color 0.15s ease,
    border-color 0.15s ease;
}
.icon-btn:hover {
  background: var(--row-hover);
  color: var(--text-1);
  border-color: var(--hairline-strong);
}
.icon-btn svg {
  width: 16px;
  height: 16px;
}

/* The menu button only exists on small screens */
.nav__burger {
  display: none;
}
.nav__burger-close {
  display: none;
}
.nav__burger[aria-expanded="true"] .nav__burger-open {
  display: none;
}
.nav__burger[aria-expanded="true"] .nav__burger-close {
  display: block;
}

/* The theme toggle swaps which glyph is painted */
html[data-theme="dark"] .icon-btn__sun {
  display: none;
}
html[data-theme="light"] .icon-btn__moon {
  display: none;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding-block: 88px 72px;
  position: relative;
  overflow: hidden;
}

/* The canvas and its scrim used to sit here. Both are gone: the scrim only
   ever existed to keep text legible over the animation behind it, so with
   the animation removed it has nothing to protect against. .hero__inner no
   longer needs a z-index for the same reason. */

.hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 48px;
  align-items: start;
}

.hero__name {
  font-size: clamp(2.5rem, 6vw, var(--text-5xl));
  line-height: 1.02;
  letter-spacing: -0.035em;
  font-weight: 680;
  margin-bottom: 14px;
}

.hero__role {
  font-size: var(--text-xl);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--text-2);
  font-weight: 450;
  margin-bottom: 22px;
}
.hero__role strong {
  color: var(--text-1);
  font-weight: 600;
}

.hero__lede {
  font-size: var(--text-lg);
  line-height: 1.62;
  color: var(--text-2);
  max-width: 62ch;
  margin-bottom: 28px;
}
.hero__lede em {
  color: var(--text-1);
  font-style: normal;
  font-weight: 550;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 16px;
  margin-bottom: 26px;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
}

/* Inline Lucide glyphs — the same set react-icons wraps. This site has no
   React or build step, so they are inlined rather than imported. */
.chip--topic svg {
  width: 13px;
  height: 13px;
  flex: none;
  opacity: 0.75;
}
.chip--topic:hover svg {
  opacity: 1;
}

.chip--topic {
  padding: 5px 10px 5px 9px;
  background: transparent;
  border-color: var(--hairline-strong);
  color: var(--text-2);
  transition:
    color 0.15s ease,
    border-color 0.15s ease,
    background 0.15s ease;
}
.chip--topic:hover {
  color: var(--text-1);
  border-color: var(--accent-border);
  background: var(--accent-soft);
}

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
}
.hero__link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: var(--text-sm);
  color: var(--text-3);
  font-weight: 500;
  transition: color 0.15s ease;
}
.hero__link:hover {
  color: var(--text-1);
}
/* Every mark is boxed at 15px, but each one's artwork fills its viewBox by a
   different amount — LinkedIn and DBLP reach the edges, the others stop at
   71-81% — so at equal box sizes the rest looked smaller. These sizes are
   15 / fill-ratio, which renders every icon's ARTWORK at the same height.
   Measured with getBBox(); re-measure if a mark is ever replaced. */
.hero__link svg,
.hero__link img {
  width: 15px;
  height: 15px;
  flex: none;
}
.hero__link[href^='mailto'] svg {
  width: 20px;
  height: 20px;
}
.hero__link[href*='scholar.google'] svg {
  width: 21px;
  height: 21px;
}
.hero__link[href*='github.com'] svg {
  width: 18.5px;
  height: 18.5px;
}
.hero__link[href*='huggingface.co'] svg {
  width: 19.5px;
  height: 19.5px;
}

/* Portrait plate */
.hero__side {
  width: 216px;
  flex: none;
}
.hero__plate {
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  background: var(--panel);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-raised);
  display: grid;
  place-items: center;
  overflow: hidden;
  position: relative;
}
.hero__plate img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero__monogram {
  font-family: var(--font-mono);
  font-size: 4rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text-1);
  opacity: 0.9;
}
.hero__affil {
  margin-top: 14px;
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
  line-height: 1.6;
  text-align: center;
}

/* Inner pages have no hero, so the first section carries neither the
   top hairline nor the full leading pad. */
.page > .section:first-child {
  border-top: 0;
  padding-top: 44px;
}

/* ============================================================
   Explore cards (home)
   ============================================================ */
.explore {
  display: grid;
  /* 3 while the Projects card is commented out in index.html; back to 4
     when it returns. */
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

/* News: one timeline per year, stacked. */
.news__year + .news__year {
  margin-top: 40px;
}

.ecard {
  display: flex;
  flex-direction: column;
  padding: 22px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow-panel);
  transition:
    border-color 0.18s ease,
    transform 0.18s ease,
    box-shadow 0.18s ease;
}
.ecard:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-raised);
}

.ecard__k {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-3);
  margin-bottom: 14px;
}

.ecard__t {
  font-size: var(--text-lg);
  font-weight: 620;
  letter-spacing: -0.012em;
  margin-bottom: 8px;
}

.ecard__d {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
}

.ecard__go {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--text-3);
  transition: color 0.15s ease;
}
.ecard:hover .ecard__go {
  color: var(--text-1);
}

/* ============================================================
   Research cards
   ============================================================ */
.research {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.rcard {
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  padding: 26px;
  box-shadow: var(--shadow-panel);
  transition:
    border-color 0.18s ease,
    transform 0.18s ease,
    box-shadow 0.18s ease;
}
.rcard:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-raised);
}

.rcard__ico {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-lg);
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  border: 1px solid;
}
.rcard__ico svg {
  width: 19px;
  height: 19px;
}
.rcard__ico--info {
  background: var(--info-soft);
  border-color: var(--info-border);
  color: var(--info);
}
.rcard__ico--violet {
  background: var(--kw-violet-soft);
  border-color: var(--kw-violet-border);
  color: var(--kw-violet);
}
.rcard__ico--cyan {
  background: var(--kw-cyan-soft);
  border-color: var(--kw-cyan-border);
  color: var(--kw-cyan);
}
.rcard__ico--success {
  background: var(--success-soft);
  border-color: var(--success-border);
  color: var(--success);
}

.rcard__title {
  font-size: var(--text-lg);
  font-weight: 620;
  letter-spacing: -0.012em;
  margin-bottom: 9px;
  line-height: 1.32;
}

.rcard__body {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: 1.62;
  margin-bottom: 16px;
}
/* The 16px above reserved room for the tag row. With no tags the body is
   the card's last child, and that margin is just slack at the bottom. */
.rcard__body:last-child {
  margin-bottom: 0;
}

.rcard__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* ============================================================
   Selected work
   ============================================================ */
.work {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.wcard {
  display: flex;
  flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  padding: 22px;
  box-shadow: var(--shadow-panel);
  transition:
    border-color 0.18s ease,
    transform 0.18s ease,
    box-shadow 0.18s ease;
}
.wcard:hover {
  border-color: var(--hairline-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-raised);
}

.wcard__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 14px;
}

.wcard__name {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.wcard__desc {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: 1.6;
  flex: 1;
  margin-bottom: 16px;
}

.wcard__meta {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
  padding-top: 14px;
  border-top: 1px solid var(--hairline);
}
.wcard__meta span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.wcard__meta svg {
  width: 13px;
  height: 13px;
}

.wcard__lang::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 99px;
  background: var(--series-3);
  display: inline-block;
}
.wcard__lang[data-lang="Python"]::before {
  background: var(--series-1);
}

/* ============================================================
   Timeline (experience + education)
   ============================================================ */
.tl {
  position: relative;
  padding-left: 26px;
}
.tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--hairline);
}

.tl__item {
  position: relative;
  padding-bottom: 30px;
}
.tl__item:last-child {
  padding-bottom: 0;
}
.tl__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 99px;
  background: var(--panel);
  border: 2px solid var(--hairline-strong);
}
.tl__item[data-current="true"]::before {
  background: var(--success);
  border-color: var(--success);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--success) 20%, transparent);
}

.tl__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 3px;
}

.tl__org {
  font-size: var(--text-lg);
  font-weight: 620;
  letter-spacing: -0.012em;
}

.tl__date {
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
  white-space: nowrap;
}

.tl__role {
  font-size: var(--text-sm);
  color: var(--text-2);
  font-weight: 550;
  margin-bottom: 4px;
}
.tl__role span {
  color: var(--text-3);
  font-weight: 400;
}

.tl__list {
  margin-top: 10px;
  display: grid;
  gap: 6px;
}
.tl__list li {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: 1.58;
  padding-left: 15px;
  position: relative;
}
.tl__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 4px;
  height: 4px;
  border-radius: 99px;
  background: var(--hairline-strong);
}

.split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 56px;
}

.subhead {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--text-3);
  font-family: var(--font-mono);
  padding-bottom: 12px;
  margin-bottom: 22px;
  border-bottom: 1px solid var(--hairline);
}

/* ============================================================
   Publications
   ============================================================ */
.pubbar {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.filter {
  padding: 6px 13px;
  border-radius: 99px;
  font-size: var(--text-sm);
  font-weight: 550;
  background: transparent;
  border: 1px solid var(--hairline);
  color: var(--text-3);
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s ease;
}
.filter:hover {
  border-color: var(--hairline-strong);
  color: var(--text-1);
}
.filter[aria-pressed="true"] {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-fg);
}
.filter__n {
  opacity: 0.6;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  margin-left: 4px;
}

.publist {
  border: 1px solid var(--hairline);
  border-radius: var(--radius-xl);
  background: var(--panel);
  box-shadow: var(--shadow-panel);
  overflow: hidden;
}

.pub {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 20px;
  border-bottom: 1px solid var(--hairline);
  transition: background 0.14s ease;
}
.pub:last-child {
  border-bottom: 0;
}
.pub:hover {
  background: var(--row-hover);
}
.pub[hidden] {
  display: none;
}

.pub__year {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-3);
  padding-top: 1px;
}

.pub__title {
  font-size: var(--text-base);
  font-weight: 570;
  line-height: 1.45;
  letter-spacing: -0.008em;
  margin-bottom: 5px;
}
.pub__title a:hover {
  text-decoration: underline;
  text-underline-offset: 2px;
}

.pub__authors {
  font-size: var(--text-sm);
  color: var(--text-3);
  line-height: 1.5;
  margin-bottom: 8px;
}
.pub__authors b {
  color: var(--text-1);
  font-weight: 650;
}

.pub__foot {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.pub__venue {
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  color: var(--text-2);
  font-weight: 600;
}

/* ============================================================
   Two-column generic lists (talks, service, awards)
   ============================================================ */
.rows {
  display: grid;
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.row {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  padding: 13px 16px;
  background: var(--panel);
  transition: background 0.14s ease;
}
.row:hover {
  background: var(--row-hover);
}

.row__k {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--text-3);
  font-weight: 600;
  padding-top: 2px;
}

.row__v {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: 1.5;
}
.row__v strong {
  color: var(--text-1);
  font-weight: 600;
  display: block;
  margin-bottom: 1px;
}

/* Mentoring grid */
.mentees {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 10px;
}
.mentee {
  padding: 13px 15px;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-lg);
  background: var(--panel);
  transition:
    border-color 0.15s ease,
    background 0.15s ease;
}
.mentee:hover {
  border-color: var(--hairline-strong);
  background: var(--row-hover);
}
.mentee__n {
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: 2px;
}
.mentee__m {
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
  line-height: 1.5;
}

/* Award callouts */
.awards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.award {
  padding: 22px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--warning-border);
  background: var(--warning-soft);
}
.award--info {
  border-color: var(--info-border);
  background: var(--info-soft);
}
.award__y {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--warning);
  margin-bottom: 8px;
}
.award--info .award__y {
  color: var(--info);
}
.award__t {
  font-size: var(--text-lg);
  font-weight: 620;
  letter-spacing: -0.012em;
  margin-bottom: 6px;
}
.award__d {
  font-size: var(--text-sm);
  color: var(--text-2);
  line-height: 1.56;
}

/* ============================================================
   Contact + footer
   ============================================================ */
.contact {
  text-align: center;
  padding-block: 96px;
}
.contact__title {
  font-size: clamp(2rem, 5vw, var(--text-4xl));
  letter-spacing: -0.03em;
  font-weight: 680;
  line-height: 1.08;
  margin-bottom: 16px;
}
.contact__body {
  font-size: var(--text-lg);
  color: var(--text-2);
  max-width: 54ch;
  margin: 0 auto 30px;
  line-height: 1.6;
}
.contact__actions {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}

.footer {
  border-top: 1px solid var(--hairline);
  padding-block: 26px;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: var(--text-xs);
  color: var(--text-3);
  font-family: var(--font-mono);
}
.footer__links {
  display: flex;
  gap: 16px;
}

/* ---------- "Last updated" stamp ----------
   A square icon button that widens into a capsule. The label is always in
   the accessibility tree — it is clipped by max-width, never display:none —
   so a screen reader reads the whole thing without any expansion. */
.footer__meta {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.stamp {
  display: inline-flex;
  align-items: center;
  gap: 0;
  height: 26px;
  padding: 0;
  border: 1px solid var(--hairline);
  border-radius: 99px;
  background: transparent;
  color: var(--text-3);
  font: inherit;
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  cursor: pointer;
  overflow: hidden;
  transition:
    border-color 0.18s ease,
    color 0.18s ease,
    background 0.18s ease,
    gap 0.24s ease;
}

.stamp__ico {
  width: 14px;
  height: 14px;
  flex: none;
  margin-inline: 5px;
}

/* The capsule grows by unclipping the label, so there is no layout jump on
   the rest of the footer until it actually opens. */
.stamp__label {
  max-width: 0;
  opacity: 0;
  white-space: nowrap;
  overflow: hidden;
  transition:
    max-width 0.28s ease,
    opacity 0.2s ease,
    padding-right 0.28s ease;
  padding-right: 0;
}

.stamp:hover,
.stamp:focus-visible,
.stamp[aria-expanded='true'] {
  border-color: var(--hairline-strong);
  color: var(--text-1);
  background: var(--accent-soft);
}

.stamp:hover .stamp__label,
.stamp:focus-visible .stamp__label,
.stamp[aria-expanded='true'] .stamp__label {
  max-width: 30ch;
  opacity: 1;
  padding-right: 10px;
}

/* No hover on touch, so the tap (which toggles aria-expanded) is the way in. */
@media (hover: none) {
  .stamp:hover .stamp__label {
    max-width: 0;
    opacity: 0;
    padding-right: 0;
  }
  .stamp[aria-expanded='true'] .stamp__label {
    max-width: 30ch;
    opacity: 1;
    padding-right: 10px;
  }
}
.footer__links a:hover {
  color: var(--text-1);
}

/* ============================================================
   Reveal on scroll — opacity + 8px only, and off entirely under
   prefers-reduced-motion (handled in the global block above).
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(8px);
  transition:
    opacity 0.5s ease,
    transform 0.5s ease;
}
.reveal.is-in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
  .research,
  .awards {
    grid-template-columns: 1fr;
  }
  .explore {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .work {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .split {
    grid-template-columns: 1fr;
    gap: 44px;
  }
  .hero__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .hero__side {
    order: -1;
    width: 150px;
  }
  .hero__affil {
    text-align: left;
  }
}

@media (max-width: 640px) {
  :root {
    --gutter: 18px;
  }

  /* Below this width the links become a disclosure panel under the bar.
     They used to be display:none, which left a seven-page site with no
     navigation at all on a phone. */
  .nav__burger {
    display: grid;
  }
  /* .nav__links carried the `margin-left: auto` that pushed everything after
     it to the right edge. Below this width it becomes position:fixed and
     leaves the flow, so the actions need to claim that space themselves —
     otherwise the burger and theme toggle bunch up against the brand. */
  .nav__actions {
    margin-left: auto;
  }
  .nav__links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin-left: 0;
    padding: 10px var(--gutter) 16px;
    background: var(--page);
    border-bottom: 1px solid var(--hairline);
    box-shadow: var(--shadow-raised);
    overflow: visible;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition:
      opacity 0.16s ease,
      transform 0.16s ease;
  }
  .nav__links[data-open="true"] {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }
  .nav__link {
    padding: 11px 12px;
    font-size: var(--text-base);
  }

  /* On a phone the 150px plate plus a four-line address block pushed the
     name down ~280px, so the first thing on screen was a photo and a
     postal address. Lay them out as one compact identity row instead. */
  .hero__side {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 14px;
  }
  .hero__plate {
    width: 84px;
    flex: none;
  }
  .hero__affil {
    margin-top: 0;
    text-align: left;
  }
  .section {
    padding-block: 56px;
  }
  .hero {
    padding-block: 56px 48px;
  }
  .work,
  .explore {
    grid-template-columns: 1fr;
  }
  .hero__actions {
    gap: 14px;
  }
  .hero__tags {
    gap: 6px;
  }
  .pub {
    grid-template-columns: 1fr;
    gap: 6px;
  }
  .row {
    grid-template-columns: 1fr;
    gap: 3px;
  }
  .contact {
    padding-block: 68px;
  }
}

/* ============================================================
   Print — the CV is the artefact; this just makes the page sane
   ============================================================ */
@media print {
  .nav,
  .hero__actions,
  .contact__actions,
  .pubbar {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
  }
  .section {
    padding-block: 20px;
    break-inside: avoid;
  }
}