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

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/JetBrainsMono-Regular.woff2") format("woff2");
}

@font-face {
  font-family: "JetBrains Mono";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/JetBrainsMono-Bold.woff2") format("woff2");
}

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

:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --fg: #e6edf3;
  --fg-dim: #8b949e;
  --fg-mute: #6e7681;
  --accent: #f78166;
  --accent-dim: #d2674f;
  --rule: #21262d;
  --add: #3fb950;
  --selection: rgba(247, 129, 102, 0.25);

  --col: 720px;
  --pad-x: clamp(1.25rem, 4vw, 2rem);
  --section-y: clamp(3rem, 8vw, 5rem);

  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

/* ---------- reset ---------- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 4rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--mono);
  font-size: 16px;
  line-height: 1.65;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--selection);
  color: var(--fg);
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

a:hover,
a:focus-visible {
  border-bottom-color: var(--accent);
}

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

p {
  margin: 0 0 1rem 0;
}

p:last-child {
  margin-bottom: 0;
}

h1,
h2,
h3 {
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin: 0 0 1rem 0;
}

h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.25rem, 2.2vw, 1.5rem);
  color: var(--fg);
}

h3 {
  font-size: 1.0625rem;
}

code,
pre,
kbd,
samp {
  font-family: var(--mono);
}

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

/* ---------- layout ---------- */

.wrap {
  max-width: var(--col);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}

main > section {
  padding: var(--section-y) 0;
  border-bottom: 1px solid var(--rule);
}

main > section:last-of-type {
  border-bottom: none;
}

/* ---------- nav ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(13, 17, 23, 0.85);
  backdrop-filter: saturate(140%) blur(8px);
  -webkit-backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}

.nav__inner {
  max-width: var(--col);
  margin: 0 auto;
  padding: 0.75rem var(--pad-x);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-size: 0.8125rem;
  color: var(--fg-dim);
}

.nav__title {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav__title::before {
  content: "$ ";
  color: var(--fg-mute);
}

.nav__links {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav__links a {
  color: var(--fg-dim);
  border-bottom: none;
}

.nav__links a:hover,
.nav__links a:focus-visible {
  color: var(--accent);
}

.nav__links a[aria-current="page"] {
  color: var(--accent);
}

@media (max-width: 560px) {
  .nav__title {
    display: none;
  }

  .nav__inner {
    justify-content: center;
  }

  .nav__links {
    justify-content: center;
    gap: 0.875rem;
  }
}

/* ---------- section heading shared ---------- */

.section-prompt {
  color: var(--fg-dim);
  font-size: 0.875rem;
  margin-bottom: 1.5rem;
  display: block;
}

.section-prompt .sigil {
  color: var(--fg-mute);
}

.section-prompt .comment {
  color: var(--fg-mute);
}

/* ---------- terminal panel (shared) ---------- */

.terminal {
  background: var(--bg-elev);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: 0.875rem 1rem;
  margin: 0.75rem 0;
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--fg);
}

.terminal .prompt {
  color: var(--accent);
  user-select: none;
}

.terminal .comment {
  color: var(--fg-mute);
}

/* ---------- footer ---------- */

.footer {
  padding: 3rem 0 4rem;
  text-align: center;
  color: var(--fg-dim);
  font-size: 0.875rem;
}

.footer__motto {
  margin-bottom: 1.25rem;
}

.footer__motto::before {
  content: "// ";
  color: var(--fg-mute);
}

.footer__links {
  display: flex;
  justify-content: center;
  gap: 0.5rem 1rem;
  flex-wrap: wrap;
}

.footer__links a {
  color: var(--fg-dim);
  border-bottom: none;
}

.footer__links a:hover,
.footer__links a:focus-visible {
  color: var(--accent);
}

.footer__sep {
  color: var(--fg-mute);
  user-select: none;
}