/* Sardor Israilov portfolio — direction: lab notebook.
   Paper, ink, one cobalt accent. Newsreader for reading/display, IBM Plex Mono for data. */

:root {
  --paper: #f4f1ea;
  --paper-2: #ebe7dc;
  --ink: #14171a;
  --graphite: #4d535a;
  --rule: #d5cfc0;
  --accent: #1b46c4;
  --on-accent: #ffffff;

  --serif: "Newsreader", "Iowan Old Style", Georgia, serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Consolas, monospace;

  --fs-sm: 0.875rem;
  --fs-base: 1.0625rem;
  --fs-md: 1.25rem;
  --fs-lg: 1.5625rem;
  --fs-xl: clamp(1.9rem, 1.4rem + 2vw, 2.6rem);
  --fs-hero: clamp(2.8rem, 1.5rem + 6vw, 5.6rem);

  --s1: 0.5rem;
  --s2: 1rem;
  --s3: 1.5rem;
  --s4: 2rem;
  --s6: 3rem;
  --s8: 4rem;

  --wrap: 1120px;
  --header-h: 64px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12151a;
    --paper-2: #1a1e25;
    --ink: #ece9e1;
    --graphite: #a5acb5;
    --rule: #2c323b;
    --accent: #8fa8ff;
    --on-accent: #0c1022;
  }
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + var(--s2));
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: var(--fs-base);
  line-height: 1.6;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, p, ul, dl, dd, figure { margin: 0; padding: 0; }
ul { list-style: none; }

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 0.2em; }
a:hover { text-decoration-thickness: 2px; }

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

.skip-link {
  position: absolute;
  left: var(--s2);
  top: -4rem;
  z-index: 100;
  padding: var(--s1) var(--s2);
  background: var(--ink);
  color: var(--paper);
  transition: top 0.15s ease;
}
.skip-link:focus { top: var(--s1); }

.wrap { width: min(100% - 2 * var(--s3), var(--wrap)); margin-inline: auto; }
.mono { font-family: var(--mono); font-size: var(--fs-sm); }

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

@media print {
  .site-header, .trace, .skip-link { display: none; }
  body { background: #fff; color: #000; }
}