/* Devansh Patel, personal site. Plain CSS, no build step. */

:root {
  --bg: #f5f4f0;
  --surface: #ffffff;
  --ink: #16181c;
  --ink-2: #3b4047;
  --muted: #6b7079;
  --line: #d6d3ca;
  --line-2: #e8e6df;
  --accent: #b5401b;
  --accent-ink: #ffffff;
  --grid: rgba(22, 24, 28, 0.055);
  --shadow: 0 1px 0 rgba(22, 24, 28, 0.04), 0 8px 24px -16px rgba(22, 24, 28, 0.25);
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "IBM Plex Sans", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --maxw: 1080px;
  --gutter: 24px;
  --radius: 4px;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg: #0f1114;
  --surface: #161920;
  --ink: #e9e7e2;
  --ink-2: #c6c4be;
  --muted: #8d939c;
  --line: #2b303a;
  --line-2: #1e222a;
  --accent: #ff7a45;
  --accent-ink: #16181c;
  --grid: rgba(233, 231, 226, 0.045);
  --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 12px 32px -20px rgba(0, 0, 0, 0.8);
  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1114;
    --surface: #161920;
    --ink: #e9e7e2;
    --ink-2: #c6c4be;
    --muted: #8d939c;
    --line: #2b303a;
    --line-2: #1e222a;
    --accent: #ff7a45;
    --accent-ink: #16181c;
    --grid: rgba(233, 231, 226, 0.045);
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 12px 32px -20px rgba(0, 0, 0, 0.8);
    color-scheme: dark;
  }
}

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

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 32px 32px;
  background-position: -1px -1px;
  font-feature-settings: "kern" 1, "liga" 1;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--accent); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 2px; }

.mono { font-family: var(--mono); font-feature-settings: "zero" 1; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--gutter); }
.skip { position: absolute; left: -999px; top: 8px; background: var(--accent); color: var(--accent-ink); padding: 6px 10px; z-index: 100; }
.skip:focus { left: 8px; }

/* ---------- header ---------- */
.site-head {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-head .row { display: flex; align-items: center; gap: 24px; height: 56px; }
.mark {
  font-family: var(--mono); font-weight: 500; font-size: 13px; letter-spacing: 0.08em;
  border: 1px solid var(--ink); padding: 4px 7px; line-height: 1; color: var(--ink);
}
.mark:hover { background: var(--ink); color: var(--bg); }
.nav { display: flex; gap: 22px; margin-left: auto; font-family: var(--mono); font-size: 13px; }
.nav a { color: var(--ink-2); }
.nav a:hover { color: var(--accent); }
.theme {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em;
  background: transparent; color: var(--ink-2); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 5px 10px; cursor: pointer;
}
.theme:hover { border-color: var(--ink); color: var(--ink); }
@media (max-width: 640px) {
  :root { --gutter: 16px; }
  .site-head .row { gap: 12px; }
  .nav { gap: 12px; font-size: 12px; }
  .nav a:nth-child(4), .nav a:nth-child(5) { display: none; }
  .theme { padding: 4px 8px; flex-shrink: 0; }
}
@media (max-width: 380px) {
  .nav a:nth-child(3) { display: none; }
}

/* ---------- hero ---------- */
.hero { padding: 72px 0 40px; }
.hero .cols { display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: start; }
.eyebrow {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted); margin: 0 0 18px;
}
.eyebrow b { color: var(--accent); font-weight: 500; }
h1 {
  font-size: clamp(40px, 6.5vw, 64px); line-height: 1.02; letter-spacing: -0.025em; font-weight: 600;
  margin: 0 0 22px;
}
.lede { font-size: 19px; line-height: 1.5; color: var(--ink-2); max-width: 640px; margin: 0 0 26px; }
.links { display: flex; flex-wrap: wrap; gap: 8px 10px; padding: 0; margin: 0; list-style: none; }
.links a {
  font-family: var(--mono); font-size: 13px;
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--line); border-radius: var(--radius); padding: 7px 11px; color: var(--ink-2);
  background: var(--surface);
}
.links a:hover { border-color: var(--accent); color: var(--accent); }
.portrait {
  width: 132px; height: 132px; object-fit: cover; border-radius: 3px;
  border: 1px solid var(--line); background: var(--surface); box-shadow: var(--shadow);
  filter: saturate(0.92);
}
.portrait-wrap { display: flex; flex-direction: column; gap: 8px; align-items: flex-end; padding-top: 6px; }
.portrait-wrap span { font-family: var(--mono); font-size: 11px; color: var(--muted); letter-spacing: 0.06em; }
@media (max-width: 640px) {
  .hero { padding: 44px 0 28px; }
  .hero .cols { grid-template-columns: 1fr; gap: 20px; }
  .portrait-wrap { order: -1; align-items: flex-start; }
  .portrait { width: 96px; height: 96px; }
  .lede { font-size: 17px; }
}

/* latest strip */
.latest {
  margin-top: 40px;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface);
  display: grid; grid-template-columns: repeat(3, 1fr);
}
.latest div { padding: 14px 16px; border-right: 1px solid var(--line-2); min-width: 0; }
.latest div:last-child { border-right: 0; }
.latest .k { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 0 0 4px; }
.latest .v { margin: 0; font-size: 14px; line-height: 1.4; color: var(--ink-2); }
.latest .v a { color: var(--ink); border-bottom: 1px solid var(--line); }
.latest .v a:hover { color: var(--accent); border-color: var(--accent); }
@media (max-width: 760px) {
  .latest { grid-template-columns: 1fr; }
  .latest div { border-right: 0; border-bottom: 1px solid var(--line-2); }
  .latest div:last-child { border-bottom: 0; }
}

/* ---------- sections ---------- */
.section { padding: 56px 0; border-top: 1px solid var(--line); }
.sec-head { display: grid; grid-template-columns: 64px 1fr; gap: 0 16px; align-items: baseline; margin-bottom: 28px; }
.sec-num { font-family: var(--mono); font-size: 13px; color: var(--accent); letter-spacing: 0.08em; }
.sec-head h2 { font-size: 26px; letter-spacing: -0.015em; font-weight: 600; margin: 0; }
.sec-sub { grid-column: 2; margin: 6px 0 0; color: var(--muted); font-size: 15px; max-width: 640px; }
@media (max-width: 640px) {
  .section { padding: 40px 0; }
  .sec-head { grid-template-columns: 1fr; gap: 4px; }
  .sec-sub { grid-column: 1; }
}

/* research cards */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; }
.card { background: var(--surface); padding: 20px 20px 22px; min-width: 0; }
.card .idx { font-family: var(--mono); font-size: 12px; color: var(--muted); letter-spacing: 0.08em; }
.card h3 { font-size: 17px; margin: 10px 0 8px; font-weight: 600; letter-spacing: -0.01em; }
.card p { margin: 0; font-size: 14.5px; color: var(--ink-2); line-height: 1.5; }
@media (max-width: 900px) { .cards { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .cards { grid-template-columns: 1fr; } }

.figure { margin: 28px 0 0; }
.figure img { display: block; width: 100%; height: 300px; object-fit: cover; object-position: center 60%; border: 1px solid var(--line); border-radius: var(--radius); filter: saturate(0.85) contrast(1.02); }
.figure figcaption { font-family: var(--mono); font-size: 12px; color: var(--muted); margin-top: 8px; letter-spacing: 0.02em; }
@media (max-width: 640px) { .figure img { height: 200px; } }

/* software */
.feature {
  display: grid; grid-template-columns: 1.35fr 1fr; gap: 28px; align-items: start;
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); padding: 22px; box-shadow: var(--shadow);
}
.feature .shot { margin: 0; }
.feature .shot img { display: block; width: 100%; height: auto; border: 1px solid var(--line); border-radius: 3px; }
.feature .shot figcaption { font-family: var(--mono); font-size: 11.5px; color: var(--muted); margin-top: 8px; }
.feature h3 { margin: 0 0 8px; font-size: 22px; letter-spacing: -0.015em; font-weight: 600; }
.feature h3 small { font-family: var(--mono); font-size: 12px; color: var(--accent); font-weight: 500; margin-left: 8px; letter-spacing: 0.06em; vertical-align: middle; }
.feature p { margin: 0 0 14px; color: var(--ink-2); font-size: 15px; }
.spec { margin: 0 0 16px; padding: 0; display: grid; grid-template-columns: max-content 1fr; gap: 6px 14px; font-size: 13.5px; }
.spec dt { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); padding-top: 2px; }
.spec dd { margin: 0; color: var(--ink-2); }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.02em;
  background: var(--ink); color: var(--bg); border: 1px solid var(--ink); border-radius: var(--radius); padding: 9px 14px;
}
.btn:hover { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn svg { width: 14px; height: 14px; }
@media (max-width: 860px) { .feature { grid-template-columns: 1fr; } }

.tools { list-style: none; margin: 16px 0 0; padding: 0; border-top: 1px solid var(--line); }
.tool { display: grid; grid-template-columns: 200px 1fr auto; gap: 16px; padding: 16px 0; border-bottom: 1px solid var(--line); align-items: start; }
.tool .name { font-weight: 600; font-size: 15.5px; letter-spacing: -0.01em; margin: 0; }
.tool .tag { display: block; font-family: var(--mono); font-size: 11.5px; color: var(--muted); margin-top: 3px; letter-spacing: 0.06em; }
.tool p { margin: 0; font-size: 14.5px; color: var(--ink-2); }
.tool code { font-family: var(--mono); font-size: 12.5px; background: var(--line-2); padding: 2px 6px; border-radius: 3px; color: var(--ink); }
.tool .go { display: flex; gap: 8px; flex-wrap: wrap; justify-content: flex-end; }
.tool .go a { font-family: var(--mono); font-size: 12.5px; border: 1px solid var(--line); border-radius: var(--radius); padding: 5px 9px; color: var(--ink-2); background: var(--surface); white-space: nowrap; }
.tool .go a:hover { border-color: var(--accent); color: var(--accent); }
@media (max-width: 760px) {
  .tool { grid-template-columns: 1fr; gap: 8px; }
  .tool .go { justify-content: flex-start; }
}

/* publications */
.filters { display: flex; gap: 6px; flex-wrap: wrap; margin: 0 0 6px; }
.filters button {
  font-family: var(--mono); font-size: 12.5px; cursor: pointer;
  background: var(--surface); color: var(--ink-2); border: 1px solid var(--line); border-radius: var(--radius); padding: 6px 11px;
}
.filters button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.filters button:hover:not([aria-pressed="true"]) { border-color: var(--ink); color: var(--ink); }
.filters button .n { color: var(--muted); margin-left: 6px; }
.filters button[aria-pressed="true"] .n { color: inherit; opacity: 0.7; }

.pubs { list-style: none; margin: 12px 0 0; padding: 0; border-top: 1px solid var(--line); }
.pub { display: grid; grid-template-columns: 64px 1fr auto; gap: 8px 16px; padding: 16px 0; border-bottom: 1px solid var(--line-2); align-items: start; }
.pub[hidden] { display: none; }
.pub-year { font-family: var(--mono); font-size: 13px; color: var(--muted); padding-top: 3px; }
.pub-title { display: block; font-weight: 600; font-size: 15.5px; line-height: 1.4; letter-spacing: -0.005em; color: var(--ink); }
.pub-title:hover { color: var(--accent); }
.pub-venue { margin: 4px 0 0; font-size: 14px; color: var(--ink-2); }
.pub-venue i { font-style: italic; }
.pub-auth { margin: 4px 0 0; font-family: var(--mono); font-size: 12px; color: var(--muted); line-height: 1.5; }
.pub-auth b { color: var(--ink-2); font-weight: 500; }
.pub-type { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); padding-top: 4px; text-align: right; }
.pub-type a { display: block; color: var(--muted); letter-spacing: 0.02em; text-transform: none; margin-top: 4px; font-size: 11.5px; }
.pub-type a:hover { color: var(--accent); }
@media (max-width: 760px) {
  .pub { grid-template-columns: 56px 1fr; }
  .pub-type { grid-column: 2; text-align: left; padding-top: 0; }
}

/* media */
.media-group { margin-top: 30px; }
.media-group:first-of-type { margin-top: 0; }
.media-label { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 0 0 12px; display: flex; align-items: center; gap: 12px; }
.media-label::after { content: ""; flex: 1; height: 1px; background: var(--line); }
.vids { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; list-style: none; margin: 0; padding: 0; }
.vids.dense { grid-template-columns: repeat(4, 1fr); gap: 14px; }
.vid { min-width: 0; }
.vid-play { position: relative; display: block; aspect-ratio: 16 / 9; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius); background: #000; }
.vid-play img { width: 100%; height: 100%; object-fit: cover; display: block; filter: saturate(0.9); transition: transform 0.3s ease; }
.vid-play:hover img { transform: scale(1.03); }
.vid-glyph { position: absolute; left: 10px; bottom: 10px; width: 34px; height: 34px; border-radius: 3px; background: rgba(22, 24, 28, 0.82); color: #fff; display: grid; place-items: center; }
.vid-glyph svg { width: 14px; height: 14px; }
.vid-play:hover .vid-glyph { background: var(--accent); color: var(--accent-ink); }
.vid-dur { position: absolute; right: 10px; bottom: 10px; font-family: var(--mono); font-size: 11px; background: rgba(22, 24, 28, 0.82); color: #fff; padding: 3px 6px; border-radius: 3px; letter-spacing: 0.04em; }
.vid iframe { display: block; width: 100%; aspect-ratio: 16 / 9; border: 1px solid var(--line); border-radius: var(--radius); background: #000; }
.vid h3 { font-size: 14.5px; font-weight: 600; line-height: 1.35; margin: 10px 0 4px; letter-spacing: -0.005em; }
.vids.dense h3 { font-size: 13.5px; }
.vid p { margin: 0; font-family: var(--mono); font-size: 11.5px; color: var(--muted); letter-spacing: 0.02em; }
@media (max-width: 900px) { .vids, .vids.dense { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 440px) { .vids { grid-template-columns: 1fr; } .vids.dense { gap: 10px; } .vids.dense h3 { font-size: 12.5px; } }

/* recognition */
.rec-group { margin-top: 30px; }
.rec-group:first-of-type { margin-top: 0; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; }
.chips a { font-family: var(--mono); font-size: 12.5px; border: 1px solid var(--line); border-radius: var(--radius); padding: 5px 9px; color: var(--ink-2); background: var(--surface); white-space: nowrap; }
.chips a:hover { border-color: var(--accent); color: var(--accent); }
.hacks { display: grid; grid-template-columns: 1fr 1fr 0.8fr; gap: 18px; align-items: stretch; }
.hack { border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--radius); background: var(--surface); padding: 18px 20px; display: flex; flex-direction: column; min-width: 0; }
.hack .tag, .project .tag { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); margin: 0 0 8px; line-height: 1.7; }
.hack .tag b, .project .tag b { color: var(--accent); font-weight: 500; }
.hack h3 { margin: 0 0 8px; font-size: 19px; font-weight: 600; letter-spacing: -0.015em; }
.hack p { margin: 0 0 14px; color: var(--ink-2); font-size: 14.5px; }
.hack .chips { margin-top: auto; }
.hack-photo { margin: 0; min-width: 0; display: flex; flex-direction: column; }
.hack-photo img { display: block; width: 100%; flex: 1; min-height: 220px; object-fit: cover; border: 1px solid var(--line); border-radius: var(--radius); filter: saturate(0.9); }
.hack-photo figcaption { font-family: var(--mono); font-size: 11.5px; color: var(--muted); margin-top: 8px; }
.project { border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--radius); background: var(--surface); padding: 20px 22px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 24px; align-items: start; }
.project.solo { grid-template-columns: 1fr; }
.project.solo p { max-width: 720px; margin-bottom: 0; }
.project h3 { margin: 0 0 8px; font-size: 19px; font-weight: 600; letter-spacing: -0.015em; }
.project p { margin: 0 0 14px; color: var(--ink-2); font-size: 14.5px; }
.awards { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.awards li { display: grid; grid-template-columns: 44px 1fr; gap: 10px; padding: 7px 0; border-bottom: 1px solid var(--line-2); font-size: 13.5px; color: var(--ink-2); line-height: 1.45; }
.awards .yr { font-family: var(--mono); font-size: 12px; color: var(--muted); padding-top: 2px; }
.awards b { font-weight: 500; color: var(--ink); }
@media (max-width: 900px) {
  .hacks { grid-template-columns: 1fr 1fr; }
  .hack-photo { grid-column: 1 / -1; }
  .hack-photo img { flex: none; min-height: 0; aspect-ratio: 16 / 9; }
  .project { grid-template-columns: 1fr; }
}
@media (max-width: 560px) { .hacks { grid-template-columns: 1fr; } }

/* contact */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; align-items: start; }
.contact p { margin: 0 0 14px; color: var(--ink-2); font-size: 15.5px; max-width: 520px; }
.contact .email { font-family: var(--mono); font-size: 18px; color: var(--ink); border-bottom: 1px solid var(--line); }
.contact .email:hover { color: var(--accent); border-color: var(--accent); }
.contact-list { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.contact-list li { display: grid; grid-template-columns: 110px 1fr; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line-2); font-size: 14.5px; }
.contact-list .k { font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); padding-top: 3px; }
.contact-list a { color: var(--ink-2); border-bottom: 1px solid transparent; }
.contact-list a:hover { color: var(--accent); border-color: var(--accent); }
@media (max-width: 760px) { .contact { grid-template-columns: 1fr; } }

/* footer title block */
.site-foot { border-top: 1px solid var(--line); padding: 28px 0 40px; }
.tblock {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: 0.04em; color: var(--muted);
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; border: 1px solid var(--line); border-radius: var(--radius); background: var(--surface); overflow: hidden;
}
.tblock div { padding: 10px 12px; border-right: 1px solid var(--line-2); min-width: 0; }
.tblock div:last-child { border-right: 0; }
.tblock .k { display: block; font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted); opacity: 0.8; margin-bottom: 3px; }
.tblock .v { color: var(--ink-2); overflow-wrap: anywhere; }
.tblock a.v:hover { color: var(--accent); }
@media (max-width: 760px) {
  .tblock { grid-template-columns: 1fr 1fr; }
  .tblock div { border-bottom: 1px solid var(--line-2); }
  .tblock div:nth-child(2n) { border-right: 0; }
  .tblock div:nth-last-child(-n+2) { border-bottom: 0; }
}

/* print */
@media print {
  :root { --bg: #fff; --surface: #fff; --ink: #000; --ink-2: #111; --muted: #444; --line: #bbb; --line-2: #ddd; --accent: #000; --grid: transparent; }
  body { background-image: none; font-size: 11pt; }
  .site-head, .theme, .filters, .skip, .figure { display: none !important; }
  .section { padding: 18pt 0; }
  .pub { break-inside: avoid; }
  .feature { box-shadow: none; }
}

@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }