/* vladislavefremov.com — personal site stylesheet. One file, no build step.
   Same layout grammar as tarnbeck.com / markdowncompanion.app; all colors, type and
   rhythm come from the vendored Tarnbeck brand tokens (css/tokens.css, v1.1).
   No product accent override: this is a person's page, it uses the Tarnbeck signature. */

:root {
  --tb-shadow: 0 1px 2px rgba(29, 31, 34, 0.06), 0 8px 24px rgba(29, 31, 34, 0.07);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) {
    --tb-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}
:root[data-theme='dark'] {
  --tb-shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }

html { color-scheme: light dark; scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
  background: var(--tb-paper);
  color: var(--tb-ink);
  font-family: var(--tb-font);
  font-size: var(--tb-size-1);
  line-height: var(--tb-leading);
  -webkit-font-smoothing: antialiased;
}
main { flex: 1 0 auto; }

a { color: var(--tb-accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:focus-visible, button:focus-visible {
  outline: 2px solid var(--tb-accent); outline-offset: 3px; border-radius: 3px;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

.skip-link {
  position: absolute; left: -9999px; top: 0;
  background: var(--tb-accent); color: var(--tb-on-accent);
  padding: 8px 14px; border-radius: 0 0 var(--tb-radius) var(--tb-radius); z-index: 100;
}
.skip-link:focus { left: 12px; }

/* ---------- wordmark (Tarnbeck footer contract): typographic, accent-colored period ---------- */

.wordmark {
  color: var(--tb-ink); text-decoration: none; font-weight: 650; letter-spacing: 0.01em;
}
.wordmark::after { content: "."; color: var(--tb-accent); font-weight: 800; }

/* the person's name in the header — same weight and tracking as the wordmark, no period */
.name { color: var(--tb-ink); text-decoration: none; font-weight: 650; letter-spacing: 0.01em; }
.name:hover { color: var(--tb-accent); }

/* ---------- header ---------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--tb-paper);
  background: color-mix(in srgb, var(--tb-paper) 96%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--tb-line);
}
.site-header .wrap { display: flex; align-items: center; gap: 24px; min-height: 60px; }
.site-header .name { font-size: var(--tb-size-2); }

.site-nav { margin-left: auto; }
.site-nav ul { display: flex; gap: 22px; list-style: none; margin: 0; padding: 0; }
.site-nav a { color: var(--tb-ink-soft); text-decoration: none; font-size: 0.95rem; }
.site-nav a:hover { color: var(--tb-ink); text-decoration: underline; }

.theme-toggle {
  background: none; border: 1px solid var(--tb-line); border-radius: 999px;
  width: 34px; height: 34px; cursor: pointer; color: var(--tb-ink); font-size: 1rem;
  display: inline-flex; align-items: center; justify-content: center; flex: none;
}
.theme-toggle:hover { border-color: var(--tb-ink-soft); }
.icon-dark { display: none; }
:root[data-theme='dark'] .icon-light { display: none; }
:root[data-theme='dark'] .icon-dark { display: inline; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme='light']) .icon-light { display: none; }
  :root:not([data-theme='light']) .icon-dark { display: inline; }
}

@media (max-width: 480px) {
  .site-header .wrap { gap: 14px; }
  .site-nav ul { gap: 14px; }
}

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

.hero { padding: 40px 0 32px; }
.hero h1 {
  font-size: clamp(2.4rem, 7vw, 4.4rem);
  line-height: 1.05; letter-spacing: -0.015em; margin: 0 0 16px; font-weight: 650;
}
.hero .sub {
  font-size: var(--tb-size-3); color: var(--tb-ink); margin: 0; max-width: 40ch; letter-spacing: -0.01em;
}
.hero .sub2 { font-size: var(--tb-size-2); color: var(--tb-ink-soft); margin: 10px 0 0; max-width: 40ch; }
.hero .intro { margin: 22px 0 0; max-width: var(--tb-measure); }
@media (max-width: 760px) { .hero { padding: 24px 0 16px; } }

/* ---------- sections ---------- */

section { padding: 40px 0; }
section h2 {
  font-size: var(--tb-size-0); font-weight: 650; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--tb-ink-soft); margin: 0 0 18px;
}
section > .wrap > p { margin: 0; max-width: var(--tb-measure); }

/* focus-area cards — the shared card style, Tarnbeck accent on the top border */
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin: 0; padding: 0; list-style: none; }
.card {
  display: flex; flex-direction: column; gap: 8px;
  background: var(--tb-paper-raised); border: 1px solid var(--tb-line);
  border-top: 3px solid var(--tb-product);
  border-radius: var(--tb-radius); padding: 20px 20px 18px;
}
.card h3 { margin: 0; font-size: var(--tb-size-2); font-weight: 650; }
.card p  { margin: 0; color: var(--tb-ink-soft); font-size: 0.97rem; }
.card .meta { margin-top: auto; padding-top: 10px; font-size: var(--tb-size-0); color: var(--tb-ink-soft); }
.card .meta a { color: var(--tb-product); font-weight: 600; text-decoration: none; }
.card .meta a:hover { text-decoration: underline; }
@media (max-width: 820px) { .cards { grid-template-columns: minmax(0, 1fr); } }

/* principles: one line each, quiet */
.principles { margin: 0; padding: 0; list-style: none; max-width: var(--tb-measure); }
.principles li { padding: 10px 0; border-top: 1px solid var(--tb-line); }
.principles li:last-child { border-bottom: 1px solid var(--tb-line); }
.principles strong { font-weight: 650; }

/* ---------- sub-pages ---------- */

.page-header { padding: 36px 0 8px; }
.page-header h1 { font-size: var(--tb-size-4); margin: 0 0 8px; letter-spacing: -0.02em; }
.lede { color: var(--tb-ink-soft); font-size: 1.05rem; margin: 0; }
.content { padding: 24px 0 72px; }
.prose { max-width: var(--tb-measure); }
.prose h2 { font-size: var(--tb-size-3); margin: 34px 0 10px; letter-spacing: -0.01em; }

/* ---------- footer (Tarnbeck footer contract, personal variant) ---------- */

.site-footer {
  border-top: 1px solid var(--tb-line); background: var(--tb-paper-raised);
  padding: 34px 0; color: var(--tb-ink-soft); font-size: 0.92rem;
}
.site-footer .wrap { display: flex; flex-direction: column; gap: 10px; }
.site-footer p { margin: 0; }
.site-footer a { color: var(--tb-ink-soft); text-decoration: none; }
.site-footer a:hover { text-decoration: underline; color: var(--tb-ink); }
.site-footer .wordmark { color: var(--tb-ink); }
.site-footer .siblings .current { color: var(--tb-ink); }
.site-footer .sep { margin: 0 6px; }

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