/* ==========================================================================
   surya.sh — International Typographic Style
   12-column grid · one typeface · one accent · hairline rules
   ========================================================================== */

:root {
  --bg: #f4f4f0;
  --fg: #0b0b0b;
  --muted: #6a6a66;
  --hair: #0b0b0b;
  --soft: #d9d9d3;
  --accent: #e3120b;

  --sans: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --margin: clamp(16px, 4vw, 56px);
  --gutter: clamp(12px, 1.6vw, 24px);
  --max: 1440px;
  --bar-h: 56px;

  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0c;
    --fg: #efefe9;
    --muted: #8d8d87;
    --hair: #efefe9;
    --soft: #2a2a28;
    --accent: #ff3b30;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--bar-h) + 8px);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  font-feature-settings: "ss01", "cv11", "tnum";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, p, ol, ul, dl, dd, figure { margin: 0; padding: 0; }
ol, ul { list-style: none; }
a { color: inherit; text-decoration: none; }
::selection { background: var(--accent); color: #fff; }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.mono { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.02em; }

.label {
  display: block;
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.u {
  background-image: linear-gradient(currentColor, currentColor);
  background-size: 100% 1px;
  background-position: 0 100%;
  background-repeat: no-repeat;
  transition: color .15s ease;
}
.u:hover { color: var(--accent); }

.skip {
  position: absolute; left: -9999px; top: 8px;
  background: var(--fg); color: var(--bg); padding: 8px 12px; z-index: 100;
}
.skip:focus { left: 8px; }

/* Layout ------------------------------------------------------------------ */

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--margin);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  column-gap: var(--gutter);
}

/* Top bar ----------------------------------------------------------------- */

.bar {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--soft);
}
.bar__inner {
  height: var(--bar-h);
  display: flex; align-items: center; gap: var(--gutter);
  font-size: 0.875rem; font-weight: 500;
}
.bar__mark { display: inline-flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: -0.01em; }
.square { width: 12px; height: 12px; background: var(--accent); display: inline-block; }
.bar__clock { color: var(--muted); margin-left: auto; }
.bar__nav { display: flex; gap: clamp(14px, 2vw, 28px); }
.bar__nav a { position: relative; }
.bar__nav a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -3px;
  height: 1px; background: currentColor; transition: right .2s ease;
}
.bar__nav a:hover::after { right: 0; }

@media (max-width: 720px) {
  .bar__clock { display: none; }
  .bar__nav { margin-left: auto; }
  .bar__mark { font-size: 0; gap: 0; }       /* keep just the red square on phones */
  .bar__mark .square { width: 14px; height: 14px; }
}

/* Hero -------------------------------------------------------------------- */

.hero { padding-top: clamp(40px, 9vw, 120px); padding-bottom: clamp(32px, 5vw, 64px); }

.hero__kicker { color: var(--muted); margin-bottom: clamp(16px, 2vw, 28px); }

.hero__name {
  font-size: clamp(3.25rem, 14.2vw, 13.5rem);
  font-weight: 700;
  line-height: 0.86;
  letter-spacing: -0.055em;
  margin-left: -0.05em;
}
.hero__name .dot { color: var(--accent); }

.hero__meta {
  margin-top: clamp(40px, 7vw, 96px);
  border-top: 1px solid var(--hair);
  padding-top: 14px;
  row-gap: 24px;
}
.hero__meta .cell { grid-column: span 3; }
.hero__meta p { font-size: 0.9375rem; font-weight: 500; margin-top: 6px; line-height: 1.4; }

.live {
  display: inline-block; width: 8px; height: 8px; border-radius: 50%;
  background: var(--accent); margin-right: 8px; vertical-align: 1px;
  animation: pulse 2.4s ease-in-out infinite;
}
@keyframes pulse { 50% { opacity: .25; } }

@media (max-width: 900px) { .hero__meta .cell { grid-column: span 6; } }

/* Sections ---------------------------------------------------------------- */

.sec { padding-block: clamp(48px, 7vw, 104px) 0; }
.sec > .grid { border-top: 1px solid var(--hair); padding-top: 14px; row-gap: 32px; }

.sec__head { grid-column: 1 / span 3; }
.sec__head h2 {
  font-size: clamp(1.5rem, 2.4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-top: 4px;
}
.sec__num { color: var(--accent); font-weight: 500; }
@media (min-width: 901px) {
  .sec__head { position: sticky; top: calc(var(--bar-h) + 20px); align-self: start; }
}

.sec__body { grid-column: 4 / -1; }

@media (max-width: 900px) {
  .sec__head, .sec__body { grid-column: 1 / -1; }
}

.lede {
  font-size: clamp(1.5rem, 3vw, 2.625rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.028em;
  max-width: 22em;
}

.cols-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gutter);
  margin-top: clamp(28px, 4vw, 48px);
}
@media (max-width: 720px) { .cols-2 { grid-template-columns: 1fr; gap: 16px; } }
.prose p { color: var(--muted); max-width: 38em; }

/* Figures ----------------------------------------------------------------- */

.figures { padding-top: clamp(56px, 8vw, 112px); }
.figures__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--hair);
  border-bottom: 1px solid var(--hair);
}
.figures figure {
  padding: clamp(16px, 2vw, 24px) var(--gutter) clamp(20px, 2.5vw, 32px) 0;
  display: flex; flex-direction: column; justify-content: space-between; gap: 32px;
}
.figures figure + figure { border-left: 1px solid var(--soft); padding-left: var(--gutter); }
.fig {
  font-size: clamp(3rem, 7vw, 6.5rem);
  font-weight: 700;
  line-height: 0.9;
  letter-spacing: -0.06em;
}
.fig em { font-style: normal; color: var(--accent); }
.figures figcaption { font-size: 0.8125rem; color: var(--muted); max-width: 22em; }

@media (max-width: 900px) {
  .figures__grid { grid-template-columns: 1fr 1fr; }
  .figures figure:nth-child(3) { border-left: 0; padding-left: 0; }
  .figures figure:nth-child(n+3) { border-top: 1px solid var(--soft); }
}

/* Rows (experience, research, education) ---------------------------------- */

.row {
  display: grid;
  grid-template-columns: 5.5rem minmax(0, 1fr) 11rem;
  gap: var(--gutter);
  padding-block: clamp(20px, 2.4vw, 32px);
  border-bottom: 1px solid var(--soft);
}
.row:first-child { padding-top: 4px; }
.list--compact .row { padding-block: 18px; }
.list--compact .row:first-child { padding-top: 4px; }

.row__date { color: var(--muted); padding-top: 4px; }
.row__meta { font-size: 0.8125rem; color: var(--muted); text-align: right; line-height: 1.45; padding-top: 2px; }

.row h3 {
  font-size: clamp(1.125rem, 1.6vw, 1.375rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.25;
}
.row .at { display: block; font-weight: 400; color: var(--muted); }
.row__main > p { margin-top: 6px; color: var(--muted); max-width: 44em; }

.points { margin-top: 14px; display: grid; gap: 8px; max-width: 46em; }
.points li { position: relative; padding-left: 20px; font-size: 0.9375rem; }
.points li::before {
  content: ""; position: absolute; left: 0; top: 0.68em;
  width: 8px; height: 1px; background: var(--accent);
}

.tags { margin-top: 16px; color: var(--muted); }

.sub { margin-top: clamp(40px, 5vw, 64px); margin-bottom: 14px; padding-top: 12px; border-top: 1px solid var(--hair); }

@media (max-width: 720px) {
  .row { grid-template-columns: 1fr; gap: 6px; }
  .row__date { order: -2; padding: 0; }
  .row__meta { order: -1; text-align: left; }
  .row__meta { font-size: 0.75rem; }
}

/* Project cards ----------------------------------------------------------- */

.cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 var(--gutter);
}
.card {
  padding: 18px 0 clamp(28px, 3vw, 44px);
  border-bottom: 1px solid var(--soft);
  display: flex; flex-direction: column;
}
.card:nth-child(-n+2) { padding-top: 4px; }
.card__top { display: flex; justify-content: space-between; color: var(--muted); }
.card__top span:first-child { color: var(--accent); }
.card h3 {
  font-size: clamp(1.375rem, 2.2vw, 1.875rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.08;
  margin: clamp(20px, 3vw, 40px) 0 12px;
  max-width: 14em;
}
.card p { font-size: 0.9375rem; color: var(--muted); max-width: 36em; }
.card .tags { margin-top: auto; padding-top: 18px; }

@media (max-width: 720px) {
  .cards { grid-template-columns: 1fr; }
  .card:nth-child(2) { padding-top: 18px; }
}

/* Skills ------------------------------------------------------------------ */

.skills {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px var(--gutter);
}
.skills dd { margin-top: 12px; font-size: 1.0625rem; font-weight: 500; line-height: 1.6; letter-spacing: -0.01em; }
@media (max-width: 900px) { .skills { grid-template-columns: repeat(2, minmax(0, 1fr)); } }

/* Contact ----------------------------------------------------------------- */

.sec--contact { padding-bottom: clamp(56px, 8vw, 120px); }
.contact__intro { color: var(--muted); max-width: 30em; font-size: 1.0625rem; }
.contact__mail {
  display: inline-flex; align-items: flex-start; gap: 0.1em;
  margin-top: clamp(20px, 3vw, 36px);
  font-size: clamp(1.75rem, 11cqi, 8rem);   /* sized to the column so the address stays on one line */
  font-weight: 700;
  letter-spacing: -0.055em;
  line-height: 0.95;
  transition: color .2s ease;
  white-space: nowrap;
}
.sec--contact .sec__body { container-type: inline-size; }
.contact__mail span { font-size: 0.4em; color: var(--accent); transition: transform .2s ease; }
.contact__mail:hover { color: var(--accent); }
.contact__mail:hover span { transform: translate(4px, -4px); }

.contact__links {
  margin-top: clamp(40px, 5vw, 64px);
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--gutter);
  border-top: 1px solid var(--soft);
  padding-top: 14px;
}
.contact__links li { display: grid; gap: 6px; font-weight: 500; }
.contact__links a { justify-self: start; }
@media (max-width: 720px) { .contact__links { grid-template-columns: 1fr; gap: 16px; } }

/* Footer ------------------------------------------------------------------ */

.foot {
  display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between;
  padding-block: 20px 32px;
  border-top: 1px solid var(--hair);
  font-size: 0.8125rem;
  color: var(--muted);
}
.foot .mono { font-size: 0.75rem; }

/* Motion ------------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

@media print {
  .bar, .skip { display: none; }
  body { background: #fff; color: #000; }
}