@font-face {
  font-family: "JetBrains Mono";
  src: url("assets/fonts/jetbrains-mono-variable.woff2") format("woff2-variations"),
       url("assets/fonts/jetbrains-mono-variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

/* ============================================================
   Engineering Log — v2 design system
   ============================================================ */

/* ---------- Dark theme (default) ---------- */
:root {
  --bg:        #0a0e14;
  --bg-elev:   #11161e;
  --bg-grid:   #1c2330;
  --text:      #d6dee6;
  --text-dim:  #8a96a3;
  --text-mute: #5a6573;
  --accent:    #f5b342;
  --accent-2:  #7fbf7f;
  --accent-3:  #e07a7a;
  --cursor:    #f5b342;

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

  --radius:    6px;
  --radius-sm: 4px;
  --shadow:    0 1px 0 rgba(245, 179, 66, 0.08), 0 8px 24px rgba(0, 0, 0, 0.4);

  --container: 920px;
  --gutter:    1.25rem;

  --line-h:    1.7;
}

/* ---------- Parchment light theme ----------
   Darker --accent and --text-mute for WCAG AA contrast against --bg.
   Computed ratios on #f5efe4 background:
     --accent #915308    -> 5.28:1  (AA pass + margin)
     --text-mute #525a66 -> 6.08:1  (AA pass + AAA body)
*/
:root[data-theme="light"] {
  --bg:        #f5efe4;
  --bg-elev:   #ece4d3;
  --bg-grid:   #d9ceb7;
  --text:      #1a1f26;
  --text-dim:  #4a5560;
  --text-mute: #525a66;
  --accent:    #915308;
  --accent-2:  #3f7a3f;
  --accent-3:  #a23a3a;
  --cursor:    #915308;
  --shadow:    0 1px 0 rgba(145, 83, 8, 0.08), 0 4px 12px rgba(26, 31, 38, 0.08);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: var(--line-h);
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
@media (min-width: 640px) { body { font-size: 16px; } }

img, svg, picture { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--text); text-decoration: underline; text-underline-offset: 3px; }
button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
  font-family: var(--font-mono);
}
h1, h2, h3 { letter-spacing: -0.01em; }

/* ---------- Container & section primitives ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.section {
  padding: 4rem 0;
  border-top: 1px solid var(--bg-grid);
}
@media (min-width: 768px) { .section { padding: 6rem 0; } }
.section__label {
  color: var(--text-mute);
  font-size: 0.8125rem;
  margin: 0 0 1.5rem;
  font-weight: 400;
}
.section h2 {
  font-size: 1.5rem;
  margin: 0 0 2rem;
  font-weight: 700;
}

/* ---------- Accessibility ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  z-index: 100;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---------- Reveal on scroll (kept from v1, tuned shorter) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.3s ease-out, transform 0.3s ease-out;
  will-change: opacity, transform;
}
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---------- Hero ---------- */
.hero {
  padding: 5rem 0 3rem;
  position: relative;
}
@media (min-width: 768px) { .hero { padding: 7rem 0 4rem; } }
.hero__inner { max-width: 720px; }

.hero__boot {
  margin: 0 0 2rem;
  font-family: var(--font-mono);
  font-size: clamp(0.875rem, 2vw, 1rem);
  line-height: 1.8;
  white-space: pre-wrap;
  color: var(--text);
  /* CLS guard: reserve enough vertical space for the longest mobile
     wrap of the boot content so the system-mono -> JetBrains-Mono
     font swap doesn't shift content below. ~22em covers a 320px
     iPhone SE wrapping the bio paragraph to 4 lines; 14em on >=640px
     where the bio fits in fewer lines. CSS-level lock applies before
     first paint (no JS dependency). */
  min-height: 22em;
}
@media (min-width: 640px) {
  .hero__boot { min-height: 14em; }
}
.boot__prompt {
  color: var(--accent);
  font-weight: 600;
}
.boot__line {
  display: inline;
}
.boot__caret-mark {
  color: var(--text-mute);
}
.boot__caret {
  display: inline-block;
  width: 0.55em;
  background: var(--cursor);
  color: transparent;
  margin-left: 2px;
  animation: blink 1.06s steps(1) infinite;
}
@keyframes blink { 50% { background: transparent; } }
@media (prefers-reduced-motion: reduce) {
  .boot__caret { animation: none; background: var(--cursor); }
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin: 0 0 2rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--bg-grid);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--text);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font-mono);
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}
.btn:hover {
  text-decoration: none;
  border-color: var(--accent);
  color: var(--accent);
}
.btn--primary {
  border-color: var(--accent);
  color: var(--accent);
}
.btn--primary:hover {
  background: var(--accent);
  color: var(--bg);
}
.btn--ghost { color: var(--text-dim); }

.hero__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.5rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
  margin: 0;
}
.metrics__prefix { color: var(--text-mute); }

.hero__skip {
  position: absolute;
  top: 1rem;
  right: 1.25rem;
  font-size: 0.75rem;
  color: var(--text-mute);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
}
.hero__skip:hover { color: var(--accent); }

/* ---------- About ---------- */
.about p {
  max-width: 65ch;
  margin: 0 0 1rem;
  color: var(--text);
}
.about p:last-child { margin-bottom: 0; }

/* ---------- Skills ---------- */
.skills {
  display: grid;
  gap: 1.25rem;
  max-width: 70ch;
}
.skill-group__label {
  margin: 0 0 0.25rem;
  color: var(--text-mute);
  font-size: 0.8125rem;
}
.skill-group__items {
  margin: 0;
  color: var(--text);
}

/* ---------- Projects ---------- */
.projects {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .projects { grid-template-columns: repeat(2, 1fr); }
}

.project {
  background: var(--bg-elev);
  border: 1px solid var(--bg-grid);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  position: relative;
  transition: border-color 0.18s ease;
}
.project::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: transparent;
  border-top-left-radius: var(--radius);
  border-bottom-left-radius: var(--radius);
  transition: background 0.18s ease;
}
.project:hover { border-color: var(--text-mute); }
.project:hover::before { background: var(--accent); }

.project__head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  color: var(--text-mute);
  margin-bottom: 0.5rem;
  letter-spacing: 0.02em;
}
.project__last-commit { margin-left: auto; }

.status {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
}
.status--active {
  background: var(--accent);
  box-shadow: 0 0 8px rgba(245, 179, 66, 0.5);
}
.status--shipped {
  background: var(--accent-2);
  box-shadow: 0 0 6px rgba(127, 191, 127, 0.4);
}
.project__status-label {
  color: var(--text-dim);
  font-weight: 500;
}

.project__name {
  font-size: 1.0625rem;
  margin: 0 0 0.5rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.project__name a { color: var(--text); }
.project__name a:hover { color: var(--accent); text-decoration: none; }
.project__private {
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--text-mute);
  border: 1px solid var(--bg-grid);
  border-radius: var(--radius-sm);
  padding: 0.05rem 0.4rem;
  margin-left: 0.4rem;
  vertical-align: middle;
  text-transform: lowercase;
}

.project__what {
  margin: 0 0 0.5rem;
  font-weight: 500;
}
.project__body {
  margin: 0 0 0.875rem;
  color: var(--text-dim);
  font-size: 0.9375rem;
}
.project__metrics {
  margin: 0 0 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-dim);
}
.project__chips {
  margin: 0;
  font-size: 0.8125rem;
  color: var(--text-mute);
}

.projects__more {
  margin: 2rem 0 0;
  font-size: 0.9375rem;
}
.projects__more a { color: var(--accent); }

/* ---------- Project media + samples ---------- */
.project__media {
  margin: 1rem 0 0;
  border: 1px solid var(--bg-grid);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg);
}
.project__media img {
  display: block;
  width: 100%;
  height: auto;
}

.project__sample {
  margin: 1rem 0 0;
  padding: 0.75rem 0.875rem;
  background: var(--bg);
  border: 1px solid var(--bg-grid);
  border-left: 2px solid var(--accent);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--text-dim);
  white-space: pre;
  overflow-x: auto;
}
.sample__dim { color: var(--text-mute); }
.sample__ok  { color: var(--accent-2); }
.sample__hi  { color: var(--accent); }
.project__cta { margin: 0.875rem 0 0; }

/* ---------- Case study ---------- */
.case-study__lede {
  font-size: 1.0625rem;
  color: var(--text);
  max-width: 65ch;
  margin: 0 0 2rem;
}
.diagram {
  margin: 0 0 2rem;
  padding: 1.25rem 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--bg-grid);
  border-radius: var(--radius);
  color: var(--accent);
  font-size: 0.75rem;
  line-height: 1.4;
  overflow-x: auto;
  white-space: pre;
}
@media (min-width: 640px) {
  .diagram { font-size: 0.8125rem; }
}
.case-study__prose h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  margin: 2rem 0 0.5rem;
  font-weight: 500;
}
.case-study__prose h3:first-child { margin-top: 0; }
.case-study__prose p {
  margin: 0 0 1rem;
  max-width: 65ch;
  color: var(--text);
}
.case-study__prose code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  color: var(--accent);
  background: var(--bg-elev);
  padding: 0.05em 0.35em;
  border-radius: 3px;
}

/* ---------- Writing post ---------- */
.writing-post {
  max-width: 65ch;
}
.writing-post__meta {
  margin: 0 0 0.25rem;
  font-size: 0.8125rem;
  color: var(--text-mute);
  letter-spacing: 0.04em;
}
.writing-post h3 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-mute);
  margin: 2rem 0 0.5rem;
  font-weight: 500;
}
.writing-post p {
  margin: 0 0 1rem;
  color: var(--text);
}
.writing-post code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  color: var(--accent);
  background: var(--bg-elev);
  padding: 0.05em 0.35em;
  border-radius: 3px;
}
.writing-post pre {
  margin: 1rem 0 1.25rem;
  padding: 1rem;
  background: var(--bg-elev);
  border: 1px solid var(--bg-grid);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.8125rem;
  line-height: 1.5;
}
.writing-post pre code {
  background: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* ---------- Timeline ---------- */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2rem;
  position: relative;
}
.timeline__item {
  position: relative;
  padding-left: 1.5rem;
  border-left: 1px solid var(--bg-grid);
}
.timeline__head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.25rem;
}
.timeline__head .status {
  position: absolute;
  left: -5px;
  top: 0.5rem;
}
.timeline__role {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.timeline__dates {
  margin-left: auto;
  color: var(--text-mute);
  font-size: 0.8125rem;
}
.timeline__org {
  margin: 0 0 0.75rem;
  color: var(--text-dim);
  font-size: 0.9375rem;
}
.timeline__bullets {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--text);
}
.timeline__bullets li { margin: 0.375rem 0; max-width: 70ch; }

/* ---------- Education ---------- */
.education__head {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.education__school {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.education__dates {
  margin-left: auto;
  color: var(--text-mute);
  font-size: 0.8125rem;
}
.education__program {
  margin: 0.25rem 0 0.75rem;
  color: var(--text-dim);
}
.education__gpa { color: var(--accent); }
.education__highlights {
  margin: 0;
  padding-left: 1.25rem;
  max-width: 70ch;
}
.education__highlights li { margin: 0.25rem 0; }

/* ---------- Contact ---------- */
.contact__lede {
  max-width: 60ch;
  margin: 0 0 1.25rem;
  color: var(--text);
}
.contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--bg-grid);
  padding: 2rem 0 3rem;
  font-size: 0.8125rem;
  color: var(--text-mute);
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  justify-content: space-between;
}
.site-footer p { margin: 0; }
.site-footer__prompt { color: var(--accent); }
.site-footer__sep { margin: 0 0.25rem; }

/* ---------- Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(180%) blur(8px);
  -webkit-backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--bg-grid);
  z-index: 20;
}
.site-nav {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0.75rem var(--gutter);
  display: flex;
  align-items: center;
  gap: 1rem;
}
.nav-brand {
  font-weight: 700;
  color: var(--text);
  font-size: 0.9375rem;
}
.nav-brand:hover { text-decoration: none; color: var(--accent); }
.nav-brand__prompt { color: var(--accent); margin-right: 0.25em; }

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
}
.nav-menu a {
  color: var(--text-dim);
  font-size: 0.875rem;
}
.nav-menu a:hover { color: var(--accent); text-decoration: none; }

.nav-toggle {
  display: none;
  margin-left: auto;
  width: 40px;
  height: 40px;
  flex-direction: column;
  gap: 5px;
  justify-content: center;
  align-items: center;
  border-radius: var(--radius-sm);
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
}
.theme-toggle {
  font-size: 0.75rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--bg-grid);
  border-radius: var(--radius-sm);
  color: var(--text-dim);
  text-transform: lowercase;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-menu {
    position: absolute;
    top: 100%;
    right: 0;
    left: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--bg-grid);
    padding: 0.5rem var(--gutter);
    display: none;
  }
  .nav-menu.is-open { display: flex; }
  .nav-menu li { padding: 0.5rem 0; }
  .nav-menu a { display: block; padding: 0.25rem 0; }
}