/* ==========================================================================
   karol.chlasta.pl
   Visual direction "Signal": light, product-landing, sans-serif.
   Palette derived from the Kozminski University portrait session —
   navy backdrop, gold tie.
   ========================================================================== */

/* --- fonts ---------------------------------------------------------------- */

/* IBM Plex Sans — headings, UI, running text */
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F,
    U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-ext-400-normal.woff2") format("woff2");
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB,
    U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-600-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F,
    U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215;
}
@font-face {
  font-family: "IBM Plex Sans";
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url("../fonts/ibm-plex-sans-latin-ext-600-normal.woff2") format("woff2");
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB,
    U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* IBM Plex Mono — labels, years, metadata */
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F,
    U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215;
}
@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/ibm-plex-mono-latin-ext-400-normal.woff2") format("woff2");
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB,
    U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* Source Serif 4 — publication entries and the long bio paragraph only */
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-400-normal.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F,
    U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215;
}
@font-face {
  font-family: "Source Serif 4";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-ext-400-normal.woff2") format("woff2");
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB,
    U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-400-italic.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+2000-206F,
    U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215;
}
@font-face {
  font-family: "Source Serif 4";
  font-style: italic;
  font-weight: 400;
  font-display: swap;
  src: url("../fonts/source-serif-4-latin-ext-400-italic.woff2") format("woff2");
  unicode-range: U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB,
    U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

/* --- tokens --------------------------------------------------------------- */

:root {
  --paper: #ffffff;
  --panel: #f3f6fa;
  --ink: #0d1420;
  --muted: #59647a;
  --hair: #e1e7ef;
  --navy: #143a72;
  --gold: #9c7222;

  --sans: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, Consolas, monospace;

  --step--2: 0.75rem;
  --step--1: 0.875rem;
  --step-0: 1rem;
  --step-1: 1.125rem;
  --step-2: 1.375rem;
  --step-3: 1.75rem;
  --step-4: 2.5rem;
  --step-5: 3.25rem;

  --measure: 65ch;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --page: 68rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0d1218;
    --panel: #151d28;
    --ink: #e6eaf1;
    --muted: #8593a8;
    --hair: #222c39;
    --navy: #86abe9;
    --gold: #d3a24a;
  }
}

:root[data-theme="dark"] {
  --paper: #0d1218;
  --panel: #151d28;
  --ink: #e6eaf1;
  --muted: #8593a8;
  --hair: #222c39;
  --navy: #86abe9;
  --gold: #d3a24a;
}

:root[data-theme="light"] {
  --paper: #ffffff;
  --panel: #f3f6fa;
  --ink: #0d1420;
  --muted: #59647a;
  --hair: #e1e7ef;
  --navy: #143a72;
  --gold: #9c7222;
}

/* --- focus --------------------------------------------------------------- */

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

/* --- reset and base ------------------------------------------------------ */

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

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: var(--step-0);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }

a { color: var(--navy); text-decoration-thickness: 1px; text-underline-offset: 2px; }

h1, h2, h3, h4 { text-wrap: balance; letter-spacing: -0.022em; margin: 0; }

.skip { position: absolute; left: -9999px; }
.skip:focus {
  left: var(--gutter);
  top: 0.5rem;
  z-index: 10;
  background: var(--paper);
  padding: 0.6rem 1rem;
  border: 1px solid var(--hair);
}

.wrap { max-width: var(--page); margin: 0 auto; padding-inline: var(--gutter); }

.eyebrow {
  font-size: var(--step--2);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  font-weight: 600;
  margin: 0;
}

.sechead {
  font-family: var(--mono);
  font-size: var(--step--2);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.5rem;
  font-weight: 400;
}

.section { padding-block: clamp(3rem, 7vw, 5.5rem); border-top: 1px solid var(--hair); }

.note { font-size: var(--step--2); color: var(--muted); }

/* --- navigation ---------------------------------------------------------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 5;
  background: var(--paper);
  border-bottom: 1px solid transparent;
  transition: border-color 160ms ease;
}
.nav[data-scrolled="true"] { border-bottom-color: var(--hair); }
.nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.5rem;
  flex-wrap: wrap;
}
.nav a { color: inherit; text-decoration: none; }
.nav strong { font-weight: 600; }
.nav ul {
  list-style: none;
  display: flex;
  gap: clamp(0.75rem, 2vw, 1.4rem);
  margin: 0;
  padding: 0;
  font-size: var(--step--1);
  color: var(--muted);
  flex-wrap: wrap;
}
.nav ul a:hover, .nav ul a[aria-current="page"] { color: var(--ink); }

.theme-toggle {
  font: inherit;
  font-size: var(--step--1);
  color: var(--muted);
  background: none;
  border: 1px solid var(--hair);
  border-radius: 0.35rem;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); }

/* --- hero ---------------------------------------------------------------- */

.hero {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: clamp(1.5rem, 5vw, 3rem);
  align-items: center;
  padding-block: clamp(2.5rem, 8vw, 5rem);
}
.hero--solo { grid-template-columns: 1fr; }
.hero h1 {
  font-size: clamp(2rem, 6vw, var(--step-5));
  line-height: 1.05;
  font-weight: 600;
  letter-spacing: -0.035em;
  margin-block: 0.9rem 1rem;
}
.hero p { color: var(--muted); max-width: 34rem; margin: 0 0 1.6rem; font-size: var(--step-1); }
.hero img { border-radius: 0.7rem; display: block; }

.btn {
  display: inline-block;
  font-size: var(--step--1);
  font-weight: 600;
  padding: 0.65rem 1.15rem;
  border-radius: 0.4rem;
  background: var(--navy);
  color: var(--paper);
  text-decoration: none;
}
.btn--ghost { background: transparent; color: var(--ink); border: 1px solid var(--hair); }
.cta { display: flex; gap: 0.6rem; flex-wrap: wrap; }

/* --- stats --------------------------------------------------------------- */

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr));
  border-block: 1px solid var(--hair);
  margin: 0;
}
.stats > div { padding: 1.1rem 0; }
.stats > div + div { border-left: 1px solid var(--hair); padding-left: 1.1rem; }
.stats dt {
  font-size: var(--step-3);
  font-weight: 600;
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}
.stats dd { margin: 0; font-size: var(--step--2); color: var(--muted); }

/* --- pillars and cards --------------------------------------------------- */

.pillars {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(18rem, 1fr));
  gap: 1rem;
}
.pill { background: var(--panel); border-radius: 0.6rem; padding: 1.5rem; }
.pill h3 { font-size: var(--step-1); font-weight: 600; margin-bottom: 0.5rem; }
.pill p { margin: 0; color: var(--muted); font-size: var(--step--1); }
.pill p + p { margin-top: 0.7rem; }

/* --- roles --------------------------------------------------------------- */

.roles { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
.roles li { display: grid; grid-template-columns: 9rem 1fr; gap: 1rem; }
.roles time {
  font-family: var(--mono);
  font-size: var(--step--2);
  color: var(--gold);
  letter-spacing: 0.04em;
  padding-top: 0.2rem;
}
.roles strong { font-weight: 600; }
.roles span { display: block; color: var(--muted); font-size: var(--step--1); }

/* --- publications, theses, preprints and talks --------------------------- */

.pub-list, .talk-list {
  margin: 0;
  padding-left: 1.6rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
.pub, .thesis, .preprint {
  font-family: var(--serif);
  font-size: var(--step-0);
  line-height: 1.6;
  max-width: var(--measure);
}
.pub cite, .thesis cite, .preprint cite { font-style: italic; }
.talk { font-size: var(--step--1); line-height: 1.6; max-width: var(--measure); }
.pub-link, .licence {
  font-family: var(--mono);
  font-size: var(--step--2);
  white-space: nowrap;
}
.pub-link { margin-right: 0.6rem; }
.licence { color: var(--muted); }
.award {
  font-family: var(--mono);
  font-size: var(--step--2);
  color: var(--gold);
  white-space: nowrap;
}
.year {
  font-family: var(--mono);
  font-size: var(--step--2);
  letter-spacing: 0.12em;
  color: var(--gold);
  margin-block: 2rem 1rem;
}

/* --- teaching and service ------------------------------------------------ */

.cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(17rem, 1fr));
  gap: 1.75rem 2.5rem;
}
.cols h3 { font-size: var(--step-0); font-weight: 600; margin-bottom: 0.6rem; }
.cols ul { margin: 0; padding-left: 1.2rem; font-size: var(--step--1); color: var(--muted); }
.cols li + li { margin-top: 0.4rem; }

/* --- awards -------------------------------------------------------------- */

.awards { list-style: none; margin: 0 0 1.75rem; padding: 0; display: grid; gap: 0.8rem; }
.awards li { display: grid; grid-template-columns: 5rem 1fr; gap: 1rem; }
.awards time {
  font-family: var(--mono);
  font-size: var(--step--2);
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.awards span { color: var(--muted); font-size: var(--step--1); }
.awards strong { color: var(--ink); font-weight: 600; font-size: var(--step-0); }

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr));
  gap: 0.75rem;
}
.gallery img { border-radius: 0.4rem; display: block; width: 100%; }
.gallery figure { margin: 0; }
.gallery figcaption { font-size: var(--step--2); color: var(--muted); margin-top: 0.4rem; }

/* --- beyond work --------------------------------------------------------- */

.beyond { display: grid; grid-template-columns: 1.5fr 1fr; gap: clamp(1.5rem, 5vw, 3rem); align-items: start; }
.beyond p { max-width: var(--measure); margin: 0 0 1rem; }
.beyond img { border-radius: 0.6rem; display: block; }

/* --- contact and footer -------------------------------------------------- */

.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  font-size: var(--step--1);
  padding: 0;
  margin: 0;
  list-style: none;
}
footer.site {
  border-top: 1px solid var(--hair);
  padding-block: 2rem;
  font-size: var(--step--2);
  color: var(--muted);
}

/* --- narrow screens ------------------------------------------------------ */

@media (max-width: 46rem) {
  .hero, .beyond { grid-template-columns: 1fr; }
  .hero img { max-width: 16rem; }
  .stats > div + div { border-left: 0; padding-left: 0; }
  .roles li, .awards li { grid-template-columns: 1fr; gap: 0.2rem; }
}

/* --- motion -------------------------------------------------------------- */

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

@media (prefers-reduced-motion: no-preference) {
  .rise { animation: rise 520ms cubic-bezier(0.22, 0.61, 0.36, 1) both; }
  .rise:nth-child(2) { animation-delay: 80ms; }
  .rise:nth-child(3) { animation-delay: 160ms; }
  .rise:nth-child(4) { animation-delay: 240ms; }
  @keyframes rise {
    from { opacity: 0; transform: translateY(8px); }
    to { opacity: 1; transform: none; }
  }
}

/* --- contact channels ---------------------------------------------------- */

.channels {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(19rem, 1fr));
  gap: 1.25rem 2.5rem;
  margin: 0 0 2rem;
}
.channels dt { font-size: var(--step-0); }
.channels dd {
  margin: 0.15rem 0 0;
  font-size: var(--step--2);
  color: var(--muted);
}