/* ---------------------------------------------------------------------------
   Gruvbox, light and dark.

   Light is defined on bare :root. Dark is applied when the OS asks for it
   (unless the reader has explicitly chosen light) and when the toggle sets
   data-theme="dark".
   ------------------------------------------------------------------------ */

:root {
  --bg:        #fbf1c7;  /* gruvbox light bg0 */
  --bg-soft:   #f2e5bc;  /* bg0_s */
  --bg-inset:  #ebdbb2;  /* bg1   */
  --fg:        #3c3836;  /* fg0   */
  --fg-soft:   #504945;
  --muted:     #7c6f64;  /* gray  */
  --faint:     #d5c4a1;  /* bg2   */
  --accent:    #af3a03;  /* orange */
  --link:      #076678;  /* blue  */
  --icon-sun:  none;
  --icon-moon: inline;

  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
          Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", "JetBrains Mono", Menlo,
          Consolas, monospace;
  --measure: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg:        #1d2021;  /* gruvbox dark bg0_h */
    --bg-soft:   #282828;  /* bg0 */
    --bg-inset:  #32302f;
    --fg:        #ebdbb2;
    --fg-soft:   #d5c4a1;
    --muted:     #a89984;
    --faint:     #3c3836;
    --accent:    #fe8019;
    --link:      #83a598;
    --icon-sun:  inline;
    --icon-moon: none;
  }
}

:root[data-theme="dark"] {
  --bg:        #1d2021;
  --bg-soft:   #282828;
  --bg-inset:  #32302f;
  --fg:        #ebdbb2;
  --fg-soft:   #d5c4a1;
  --muted:     #a89984;
  --faint:     #3c3836;
  --accent:    #fe8019;
  --link:      #83a598;
  --icon-sun:  inline;
  --icon-moon: none;
}

/* --- base ---------------------------------------------------------------- */

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

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

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

a { color: inherit; text-decoration: none; }

.prose a, .intro a, footer a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  text-decoration-color: color-mix(in srgb, var(--link) 35%, transparent);
  transition: text-decoration-color 120ms ease, color 120ms ease;
}
.prose a:hover, .intro a:hover, footer a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

::selection { background: color-mix(in srgb, var(--accent) 25%, transparent); }

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

/* --- chrome -------------------------------------------------------------- */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2rem 1.5rem 0;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}
.wordmark:hover { color: var(--fg); }

/* The NS monogram (templates/base.html). Its two halves are the same shape
   turned 180 degrees; they part slightly on hover and slide together when
   the front page loads. Offsets are in the mark's own units (238 wide). */
.mark { flex: none; width: 1.35rem; height: 1.35rem; overflow: visible; }
.mark .ns-a { fill: var(--fg); }
.mark .ns-b { fill: var(--accent); }
.mark .ns-a, .mark .ns-b { transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1); }
.wordmark:hover .ns-a, .mark-lg:hover .ns-a { transform: translate(-18px, -18px); }
.wordmark:hover .ns-b, .mark-lg:hover .ns-b { transform: translate(18px, 18px); }

.topbar nav {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.85rem;
}
.topbar nav a { color: var(--muted); }
.topbar nav a:hover { color: var(--fg); }

#theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.25rem;
  border: 0;
  background: none;
  color: var(--muted);
  cursor: pointer;
  line-height: 0;
}
#theme-toggle:hover { color: var(--accent); }
#theme-toggle svg { fill: none; stroke: currentColor; stroke-width: 1.3; stroke-linecap: round; }
#theme-toggle .sun  { display: var(--icon-sun); }
#theme-toggle .moon { display: var(--icon-moon); fill: currentColor; stroke: none; }

main {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4rem;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  border-top: 1px solid var(--faint);
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}

/* --- resume masthead ----------------------------------------------------- */

.masthead { margin-bottom: 2.5rem; }

.mark-lg { display: block; width: 4.5rem; height: 4.5rem; margin-bottom: 1.5rem; }
/* `backwards`, not `both`: once the entrance ends it must let go of
   `transform`, or the hover transition above never runs and the halves jump. */
.mark-lg .ns-a { animation: ns-in-a 0.9s cubic-bezier(0.2, 0.8, 0.2, 1) backwards; }
.mark-lg .ns-b { animation: ns-in-b 0.9s 0.08s cubic-bezier(0.2, 0.8, 0.2, 1) backwards; }
@keyframes ns-in-a { from { transform: translate(-90px, -140px); opacity: 0; } }
@keyframes ns-in-b { from { transform: translate(90px, 140px); opacity: 0; } }

.masthead h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.tagline {
  margin: 0.6rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1.1rem;
  margin-top: 1.1rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}
.contact a {
  color: var(--muted);
  border-bottom: 1px solid var(--faint);
  padding-bottom: 1px;
}
.contact a:hover { color: var(--accent); border-bottom-color: currentColor; }

/* The email is spelled out rather than linked, so people type it in. It
   gets its own line; "at" and "dot" are tinted so it reads as deliberate. */
.email {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  margin: 1.1rem 0 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.02em;
  color: var(--fg-soft);
}
.email svg {
  flex: none;
  width: 0.95rem;
  height: 0.95rem;
  fill: none;
  stroke: var(--muted);
  stroke-width: 1.2;
  stroke-linejoin: round;
}
.email .spelled { color: var(--accent); }
.email + .contact { margin-top: 0.6rem; }

/* On a phone the monogram alone stands in for the name, so the nav fits. */
@media (max-width: 30rem) {
  .wordmark > span { display: none; }
  .topbar nav { gap: 1rem; }
}

/* --- prose --------------------------------------------------------------- */

.prose > *:first-child { margin-top: 0; }
.prose > *:last-child  { margin-bottom: 0; }

.prose h2 {
  margin: 3rem 0 1.25rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--faint);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

/* A resume entry: organisation on the left, dates pushed to the right.
   src/resume.rs builds these from the `###` heading and its meta line. */
.prose h3 {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin: 1.75rem 0 0.15rem;
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.prose h3 .when {
  flex: none;
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.prose h3 + p {
  margin: 0 0 0.5rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.prose h4 {
  margin: 1.5rem 0 0.4rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.prose p { margin: 0 0 1.1rem; }

.prose ul, .prose ol { margin: 0 0 1.1rem; padding-left: 1.2rem; }
.prose li { margin: 0.3rem 0; }
.prose li::marker { color: color-mix(in srgb, var(--muted) 55%, transparent); }

.prose strong { font-weight: 600; }

.prose hr {
  margin: 2.5rem 0;
  border: 0;
  border-top: 1px solid var(--faint);
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.1rem 0 0.1rem 1.1rem;
  border-left: 2px solid var(--accent);
  color: var(--muted);
}

.prose img { max-width: 100%; height: auto; border-radius: 4px; }

.prose code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--bg-inset);
  padding: 0.12em 0.35em;
  border-radius: 3px;
}

.prose pre {
  margin: 1.5rem 0;
  padding: 1rem 1.1rem;
  overflow-x: auto;
  background: var(--bg-soft);
  border: 1px solid var(--faint);
  border-radius: 6px;
  font-size: 0.82rem;
  line-height: 1.6;
}
.prose pre code { background: none; padding: 0; font-size: inherit; }

.table-scroll, .prose table { display: block; overflow-x: auto; }
.prose table {
  width: 100%;
  margin: 1.5rem 0;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.prose th, .prose td {
  padding: 0.5rem 0.75rem 0.5rem 0;
  text-align: left;
  border-bottom: 1px solid var(--faint);
}
.prose th { font-weight: 600; color: var(--muted); }

.prose sup a { text-decoration: none; }
.footnote-definition { font-size: 0.85rem; color: var(--muted); }
.footnote-definition p { display: inline; }

/* --- blog ---------------------------------------------------------------- */

.page h1, .post-header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.7rem, 4.5vw, 2.1rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.intro { margin: 0 0 2.5rem; color: var(--muted); }

.entries { list-style: none; margin: 0; padding: 0; }

.entry {
  padding: 1.4rem 0;
  border-bottom: 1px solid var(--faint);
}
.entry:first-child { padding-top: 0; }

.entry-title {
  display: block;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}
.entry-title:hover { color: var(--accent); }

.entry time {
  display: block;
  margin-top: 0.2rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.entry p { margin: 0.5rem 0 0; color: var(--muted); font-size: 0.92rem; }

.post-header { margin-bottom: 2.5rem; }

.meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.6rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.dot { opacity: 0.6; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  margin: 0.9rem 0 0;
  padding: 0;
}
.tags li {
  padding: 0.1rem 0.5rem;
  border: 1px solid var(--faint);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.68rem;
  color: var(--muted);
}

.post-footer {
  margin-top: 3.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--faint);
  font-family: var(--mono);
  font-size: 0.78rem;
}
.post-footer a { color: var(--muted); }
.post-footer a:hover { color: var(--accent); }

/* --- particle simulator ------------------------------------------------- */

.sim-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 1.5rem 0 0.75rem;
}
.sim-controls button {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--faint);
  border-radius: 4px;
  background: var(--bg-soft);
  color: var(--fg);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}
.sim-controls button:hover { border-color: var(--accent); color: var(--accent); }
.sim-controls kbd {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--muted);
}

/* The simulator sizes the canvas from this box and maps the pointer with
   offsetLeft/offsetTop, so the canvas gets no CSS size, border or padding and
   nothing around it may be positioned. */
.sim-stage { margin: 0 0 0.75rem; line-height: 0; }
.sim-stage canvas { display: block; border-radius: 4px; touch-action: none; cursor: crosshair; }
.sim-stage noscript p { line-height: 1.6; }

.sim-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  margin: 0 0 1.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--muted);
}
.sim-stats div { display: flex; gap: 0.4rem; }
/* The simulator still writes X/Y into these; they just stay out of sight. */
.sim-stats [hidden] { display: none; }
.sim-stats dd { margin: 0; color: var(--fg); }

/* --- print: the front page doubles as a printable resume ----------------- */

@media print {
  :root {
    --bg: #fff; --bg-soft: #fff; --bg-inset: #fff;
    --fg: #000; --fg-soft: #000; --muted: #444; --faint: #bbb;
    --accent: #000; --link: #000;
  }
  .topbar, footer, .post-footer { display: none; }
  body { font-size: 10.5pt; line-height: 1.45; }
  main { max-width: none; padding: 0; }
  .masthead { margin-bottom: 1.5rem; }
  .prose h2 { margin-top: 1.5rem; }
  .prose h3 { margin-top: 1rem; }
  .prose a { text-decoration: none; }
  .prose h2, .prose h3, .entry { break-inside: avoid; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}