/* ---------------------------------------------------------------------------
   Giulio Isacchini — personal site
   Swiss / technical system: visible grid, Inter + monospace metadata,
   monochrome with a single signal accent. Sharp corners, hairline rules.
--------------------------------------------------------------------------- */

:root {
  --bg:      #f3f3f1;
  --panel:   #ffffff;
  --ink:     #111111;
  --sub:     #6b6b6b;
  --rule:    #111111;   /* structural black lines */
  --hair:    #d6d6d3;   /* dashed dividers */
  --accent:  #e8000d;   /* signal red — numbers, kickers, marks */
  --link:    #b50009;   /* readable link text on light */
  --sans: "Inter", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --frame: 1120px;
  --pad: 28px;
}
:root[data-theme="dark"] {
  --bg:     #0d0d0d;
  --panel:  #161616;
  --ink:    #ededed;
  --sub:    #8f8f8f;
  --rule:   #3a3a3a;
  --hair:   #272727;
  --accent: #ff2d38;
  --link:   #ff6060;
}
/* figure palette: accent carries the data/model series, gray the reference.
   Dark accent is a darker step of the brand orange, validated against #161616. */
:root {
  --fig-accent: #e8000d;
  --fig-ref:    #6b6b6b;
}
:root[data-theme="dark"] {
  --fig-accent: #ff2d38;
  --fig-ref:    #8f8f8f;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 60px; }
body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background .25s, color .25s;
}
.mono { font-family: var(--mono); }
a { color: var(--link); text-decoration: none; }

.frame {
  max-width: var(--frame);
  margin: 0 auto;
  border-left: 1px solid var(--rule);
  border-right: 1px solid var(--rule);
  min-height: 100vh;
}

/* ---------------------------------------------------------- topbar */
.topbar {
  position: sticky; top: 0; z-index: 40;
  display: flex; align-items: center; justify-content: space-between;
  padding: 13px var(--pad);
  border-bottom: 1px solid var(--rule);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(160%) blur(8px);
}
.topbar .brand {
  font-family: var(--mono); font-size: 12.5px; font-weight: 500;
  letter-spacing: .14em; text-transform: uppercase; color: var(--ink);
}
.topbar nav { display: flex; align-items: center; gap: 4px; }
.topbar nav a {
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--sub); padding: 6px 10px;
  transition: color .18s;
}
.topbar nav a:hover { color: var(--accent); }
.toggle {
  display: inline-grid; place-items: center; width: 34px; height: 34px;
  margin-left: 8px; border: 1px solid var(--rule); background: transparent;
  color: var(--ink); cursor: pointer; transition: color .18s, border-color .18s;
}
.toggle:hover { color: var(--accent); border-color: var(--accent); }
.toggle svg { width: 15px; height: 15px; }
.toggle .moon { display: none; }
:root[data-theme="dark"] .toggle .sun { display: none; }
:root[data-theme="dark"] .toggle .moon { display: block; }

/* ---------------------------------------------------------- hero */
.hero { display: grid; grid-template-columns: 1fr 300px; border-bottom: 1px solid var(--rule); }
.hero-main { padding: 46px var(--pad) 38px; }
.kicker {
  font-family: var(--mono); font-size: 11px; letter-spacing: .24em;
  text-transform: uppercase; color: var(--accent); margin-bottom: 22px;
}
.hero h1 {
  font-size: clamp(42px, 7.5vw, 76px); line-height: .96;
  letter-spacing: -.045em; font-weight: 600;
}
.hero .role {
  margin-top: 22px; font-size: 17px; line-height: 1.5; max-width: 44ch; color: var(--ink);
}
.hero .role strong { font-weight: 600; }
.hero-links { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 20px; }
.hero-links a {
  font-family: var(--mono); font-size: 11.5px; letter-spacing: .1em;
  text-transform: uppercase; color: var(--ink); display: inline-flex; align-items: center; gap: 5px;
  border-bottom: 1px solid var(--hair); padding-bottom: 3px; transition: color .18s, border-color .18s;
}
.hero-links a:hover { color: var(--accent); border-color: var(--accent); }
.hero-links a .arw { color: var(--sub); }

.hero-side { border-left: 1px solid var(--rule); display: flex; flex-direction: column; }
.hero-side .photo {
  aspect-ratio: 1 / 1; border-bottom: 1px solid var(--rule);
  background: var(--bg); display: grid; place-items: center;
}
.hero-side .photo img { width: 82%; height: 82%; object-fit: contain; }
.hero-side .facts { padding: 14px 20px; }
.hero-side .facts div {
  display: flex; justify-content: space-between; gap: 12px;
  padding: 7px 0; border-bottom: 1px dashed var(--hair);
  font-family: var(--mono); font-size: 11px; letter-spacing: .05em; text-transform: uppercase;
}
.hero-side .facts div:last-child { border-bottom: 0; }
.hero-side .facts span { color: var(--sub); }
.hero-side .facts b { color: var(--ink); font-weight: 500; text-align: right; }

/* ---------------------------------------------------------- sections */
.section { display: grid; grid-template-columns: 210px 1fr; border-top: 1px solid var(--rule); }
.section:first-of-type { border-top: 0; }
.s-label {
  font-family: var(--mono); font-size: 12px; font-weight: 500;
  letter-spacing: .16em; text-transform: uppercase; color: var(--ink);
  padding: 20px 12px 0 var(--pad); align-self: start;
}
.s-body { padding: 18px var(--pad) 30px 0; }

/* about */
.prose-lead { font-size: 16.5px; line-height: 1.62; max-width: 60ch; color: var(--ink); }
.prose-lead p { margin-bottom: 1em; }
.prose-lead p:last-child { margin-bottom: 0; }

/* row-based lists (experience, education, papers, writing) */
.row { display: grid; grid-template-columns: 118px 1fr; gap: 0; padding: 15px 0; border-top: 1px dashed var(--hair); }
.row:first-child { border-top: 0; padding-top: 2px; }
.row .yr { font-family: var(--mono); font-size: 12px; color: var(--sub); letter-spacing: .03em; padding-top: 2px; }
.row .t { font-weight: 600; font-size: 15.5px; line-height: 1.35; letter-spacing: -.005em; }
.row .t a { color: var(--ink); }
.row .t a:hover { color: var(--link); }
.row .w { color: var(--sub); font-size: 14px; margin-top: 1px; }
.row .d { color: var(--ink); font-size: 14px; line-height: 1.5; margin-top: 6px; max-width: 64ch; opacity: .82; }
.row .d ul { margin: 5px 0 0; padding-left: 16px; }
.row .d li { margin: 2px 0; }
.row .authors { color: var(--sub); font-size: 13px; margin-top: 3px; line-height: 1.45; max-width: 72ch; }
.row .authors b { color: var(--ink); font-weight: 600; }
.row .venue { font-family: var(--mono); font-size: 11.5px; color: var(--sub); margin-top: 4px; letter-spacing: .02em; }

/* writing */
.write { display: grid; grid-template-columns: 1fr 1fr; border-top: 1px solid var(--hair); }
.write a.card {
  display: block; padding: 22px 24px 24px; border-right: 1px solid var(--hair);
  transition: background .18s;
}
.write a.card:nth-child(2n) { border-right: 0; }
.write a.card:nth-child(n+3) { border-top: 1px solid var(--hair); }
.write a.card:hover { background: var(--panel); }
.write .tag { font-family: var(--mono); font-size: 10.5px; letter-spacing: .14em; text-transform: uppercase; color: var(--accent); }
.write h3 { font-size: 17px; font-weight: 600; letter-spacing: -.01em; margin: 10px 0 8px; color: var(--ink); line-height: 1.28; }
.write p { font-size: 13.5px; color: var(--sub); line-height: 1.5; }
.write .more { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--link); margin-top: 12px; display: inline-block; }

/* footer */
.foot {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  padding: 18px var(--pad); border-top: 1px solid var(--rule);
  font-family: var(--mono); font-size: 11px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--sub);
}
.foot a { color: var(--sub); }
.foot a:hover { color: var(--accent); }

/* ---------------------------------------------------------- article */
.article { max-width: 760px; margin: 0 auto; padding: 46px var(--pad) 20px; }
.article .back { font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--sub); }
.article .back:hover { color: var(--accent); }
.article h1 { font-size: clamp(28px, 4.5vw, 42px); line-height: 1.08; letter-spacing: -.03em; font-weight: 600; margin: 20px 0 10px; }
.article .byline { font-family: var(--mono); font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--sub); padding-bottom: 26px; border-bottom: 1px solid var(--rule); margin-bottom: 30px; }
.prose { font-size: 16.5px; line-height: 1.7; }
.prose h2 { font-size: 20px; font-weight: 600; letter-spacing: -.01em; margin: 1.9em 0 .55em; padding-top: .3em; }
.prose p { margin: 0 0 1.15em; color: var(--ink); }
.prose a { border-bottom: 1px solid color-mix(in srgb, var(--link) 40%, transparent); }
.prose a:hover { border-color: var(--link); }
.prose img { max-width: 100%; height: auto; display: block; margin: 1.6em auto; border: 1px solid var(--rule); }
.prose ul, .prose ol { padding-left: 20px; margin: 0 0 1.15em; }
.prose li { margin: .35em 0; }
.prose ol li::marker { color: var(--sub); font-variant-numeric: tabular-nums; }
.prose li:target { background: color-mix(in srgb, var(--accent) 12%, transparent); }
.prose sup.cite { font-size: .68em; line-height: 0; margin-left: 1px; font-family: var(--mono); }
.prose sup.cite a { border-bottom: none; color: var(--sub); }
.prose sup.cite a:hover { color: var(--accent); }
.mjx-container { overflow-x: auto; overflow-y: hidden; max-width: 100%; }

/* ---------------------------------------------------------- figures */
.fig { border: 1px solid var(--rule); margin: 1.8em auto; max-width: 88%; }
.fig-head {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  padding: 10px 14px; border-bottom: 1px dashed var(--hair);
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
}
.fig-tag { color: var(--accent); white-space: nowrap; }
.fig-title { color: var(--ink); }
.fig-read { margin-left: auto; color: var(--sub); text-transform: none; letter-spacing: .02em; white-space: nowrap; }
.fig-body { padding: 10px 8px 2px; overflow-x: auto; }
.fig-body svg { display: block; width: 100%; min-width: 560px; height: auto; }
.fig-body svg:focus-visible { outline: 1px solid var(--accent); outline-offset: 2px; }
.fig svg text { font-family: var(--mono); }
.fig .grid { stroke: var(--hair); }
.fig .axis { stroke: var(--sub); }
.fig .tick-label { fill: var(--sub); font-size: 11px; }
.fig .plabel { fill: var(--ink); font-size: 12px; }
.fig .pcap { fill: var(--sub); font-size: 10px; letter-spacing: .12em; }
.fig .curve { fill: none; stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.fig .curve.ref { stroke: var(--fig-ref); }
.fig .curve.acc { stroke: var(--fig-accent); }
.fig .curve.ink { stroke: var(--ink); }
.fig .curve.dash { stroke-dasharray: 6 5; stroke-width: 1.6; }
.fig .curve.thin { stroke-width: 1.1; opacity: .5; }
.fig .wash { stroke: none; }
.fig .wash.ref { fill: var(--fig-ref); opacity: .08; }
.fig .wash.acc { fill: var(--fig-accent); opacity: .09; }
.fig .anno { fill: var(--sub); font-size: 11px; }
.fig .xline { stroke: var(--sub); opacity: .5; }
.fig .dot { fill: var(--ink); stroke: var(--bg); stroke-width: 2; }
.fig .dot.ref { fill: var(--fig-ref); }
.fig .cross { stroke: var(--sub); opacity: .6; }
.fig .rug.acc { stroke: var(--fig-accent); opacity: .4; }
.fig .rug.ref { stroke: var(--fig-ref); opacity: .4; }
.fig .ctick { stroke: var(--fig-accent); stroke-width: 2; }
.fig .dot.acc { fill: var(--fig-accent); }
.fig .mhead { fill: var(--sub); stroke: none; }
.fig .mhead.acc { fill: var(--fig-accent); }
.key .sw.pt { width: 9px; height: 9px; border: 0; border-radius: 50%; background: var(--fig-accent); }
.key .sw.pt.ink { background: var(--ink); }
.fig-legend {
  display: flex; flex-wrap: wrap; gap: 8px 20px; padding: 8px 14px 6px;
  font-family: var(--mono); font-size: 11px; letter-spacing: .02em; color: var(--ink);
}
.key { display: inline-flex; align-items: center; gap: 7px; }
.key .sw { width: 16px; border-top: 2px solid var(--ink); }
.key .sw.ref { border-top-color: var(--fig-ref); }
.key .sw.acc { border-top-color: var(--fig-accent); }
.key .sw.dash { border-top-style: dashed; }
.key .sw.tick { width: 0; height: 10px; border-top: 0; border-left: 2px solid var(--ink); }
.key .sw.tick.ref { border-left-color: var(--fig-ref); }
.key .sw.tick.acc { border-left-color: var(--fig-accent); }
.fig-note { padding: 0 14px 12px; font-size: 13px; line-height: 1.5; color: var(--sub); }
.fig-controls {
  display: flex; flex-wrap: wrap; align-items: center; gap: 14px 24px;
  padding: 10px 14px; border-bottom: 1px dashed var(--hair);
  font-family: var(--mono); font-size: 11px; color: var(--sub); letter-spacing: .02em;
}
.fig-controls label { display: inline-flex; align-items: center; gap: 8px; }
.fig-controls input[type="range"] { width: 130px; accent-color: var(--accent); }
.fig-controls .val { color: var(--ink); min-width: 4ch; }
.fig-controls button {
  font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase;
  background: transparent; color: var(--ink); border: 1px solid var(--rule);
  padding: 5px 12px; cursor: pointer; transition: color .18s, border-color .18s;
}
.fig-controls button:hover { color: var(--accent); border-color: var(--accent); }

/* ---------------------------------------------------------- print */
@media print {
  .fig { break-inside: avoid; }
  .prose h2 { break-after: avoid; }
  .topbar, .toggle { display: none; }
}

/* ---------------------------------------------------------- responsive */
@media (max-width: 760px) {
  .topbar nav a { display: none; }
  .hero { grid-template-columns: 1fr; }
  .hero-side { border-left: 0; border-top: 1px solid var(--rule); flex-direction: row; }
  .hero-side .photo { width: 44%; aspect-ratio: 1/1; border-bottom: 0; border-right: 1px solid var(--rule); }
  .hero-side .facts { flex: 1; }
  .section { display: block; padding: 0 20px; }
  .s-label { display: block; padding: 18px 0 4px 0; }
  .s-body { padding: 6px 0 24px; }
  .row { grid-template-columns: 1fr; }
  .row .yr { padding: 0 0 4px; }
  .write { grid-template-columns: 1fr; }
  .write a.card { border-right: 0; border-bottom: 1px solid var(--hair); }
  .write a.card:nth-child(n+3) { border-top: 0; }
}