:root {
  --bg: #1C2320;
  --bg-raised: #232B27;
  --bg-header: #1A211E;
  --ink: #E9E4D5;
  --ink-soft: #9C9887;
  --copper: #DB8E52;
  --copper-dim: #B8703A;
  --pcb: #82BA97;
  --line: #313A34;
  --line-strong: #444F47;
  --content-max: 680px;
  --page-max: 1180px;
  --sidebar-w: 250px;
}

* { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; }

body {
  margin: 0;
  background: radial-gradient(1100px 560px at 12% -8%, rgba(219,142,82,0.07), transparent 60%),
              radial-gradient(900px 500px at 100% 110%, rgba(130,186,151,0.05), transparent 55%),
              var(--bg);
  background-attachment: fixed;
  color: var(--ink);
  font-family: 'IBM Plex Serif', Georgia, serif;
  font-size: 17px;
  line-height: 1.65;
  min-height: 100vh;
}

a { color: var(--pcb); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--copper); }
a:focus-visible, button:focus-visible { outline: 2px solid var(--copper); outline-offset: 3px; }

.mono { font-family: 'IBM Plex Mono', ui-monospace, Menlo, monospace; letter-spacing: 0.01em; }

/* ---------- page shell: sidebar + content ---------- */

.page {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 32px;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  gap: 56px;
  align-items: start;
}

aside.sidebar {
  position: sticky;
  top: 0;
  padding: 40px 0 40px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.wordmark { font-family: 'IBM Plex Mono', monospace; font-size: 15px; font-weight: 500; color: var(--ink); text-decoration: none; }
.wordmark span { color: var(--copper); }
.sidebar .role { margin: 8px 0 28px; color: var(--ink-soft); font-size: 13.5px; font-style: italic; max-width: 20ch; }

nav.primary { font-family: 'IBM Plex Mono', monospace; font-size: 13.5px; display: flex; flex-direction: column; gap: 12px; }
nav.primary a { color: var(--ink-soft); text-decoration: none; padding: 2px 0; border-left: 2px solid transparent; padding-left: 10px; margin-left: -12px; }
nav.primary a:hover { color: var(--ink); }
nav.primary a.current { color: var(--ink); border-left-color: var(--copper); font-weight: 500; }

.sidebar-foot { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--ink-soft); display: flex; flex-direction: column; gap: 8px; }
.sidebar-foot a { color: var(--ink-soft); }
.lang-toggle { font-size: 12px; }
.social-links { display: contents; }

main.content { min-width: 0; padding: 40px 0 80px; }

/* mobile: sidebar becomes a top bar */
@media (max-width: 860px) {
  .page { grid-template-columns: 1fr; gap: 0; padding: 0 20px; }
  aside.sidebar {
    position: sticky; top: 0; z-index: 50; min-height: 0;
    background: var(--bg-header); border-bottom: 1px solid var(--line-strong);
    margin: 0 -20px; padding: 14px 20px;
    display: grid;
    grid-template-columns: 1fr auto;
    column-gap: 10px;
    row-gap: 8px;
    align-items: center;
  }
  .sidebar > div:first-child,
  .sidebar-foot { display: contents; }
  .sidebar .role { display: none; }
  .wordmark { grid-column: 1; grid-row: 1; }
  nav.primary { grid-column: 1; grid-row: 2; flex-direction: row; gap: 16px; }
  nav.primary a { border-left: none; padding-left: 0; margin-left: 0; border-bottom: 2px solid transparent; }
  nav.primary a.current { border-left: none; border-bottom-color: var(--copper); }
  main.content { padding: 32px 0 60px; }

  .lang-toggle {
    grid-column: 2; grid-row: 1; justify-self: end;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 2px;
  }
  .lang-toggle a,
  .lang-toggle .active-lang {
    padding: 4px 6px;
    display: inline-block;
  }
  .social-links {
    grid-column: 2; grid-row: 2; justify-self: end;
    display: flex;
    flex-direction: row;
    gap: 14px;
  }
}

/* ---------- hero (home only) ---------- */

.hero h1 { margin: 0 0 6px; font-family: 'IBM Plex Serif', serif; font-weight: 500; font-size: 42px; line-height: 1.15; letter-spacing: -0.01em; }
.hero .role-line { margin: 0 0 22px; color: var(--ink-soft); font-size: 18px; font-style: italic; }

.trace-wrap { width: 100%; max-width: 380px; margin: 0 0 26px; }
.trace-wrap svg { width: 100%; height: auto; display: block; }
.trace-path { fill: none; stroke: var(--copper); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 620; stroke-dashoffset: 620; animation: draw 1.6s 0.2s cubic-bezier(.4,0,.2,1) forwards; }
.trace-dot { fill: var(--copper); opacity: 0; animation: dotIn 0.4s 1.7s forwards; }
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes dotIn { to { opacity: 1; } }
@media (prefers-reduced-motion: reduce) { .trace-path { animation: none; stroke-dashoffset: 0; } .trace-dot { animation: none; opacity: 1; } }

.hero p.intro { max-width: 62ch; color: var(--ink); margin: 0 0 16px; }
.hero p.bio { max-width: 62ch; color: var(--ink-soft); font-size: 15.5px; margin: 0 0 22px; }

.skills-strip { font-family: 'IBM Plex Mono', monospace; font-size: 12.5px; display: flex; flex-wrap: wrap; gap: 8px 0; color: var(--ink-soft); margin-bottom: 30px; }
.skills-strip span { white-space: nowrap; }
.skills-strip span:not(:last-child)::after { content: "  ·  "; color: var(--line-strong); }

.cta-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.btn { font-family: 'IBM Plex Mono', monospace; font-size: 13px; display: inline-block; padding: 9px 16px; border: 1px solid var(--ink); color: var(--ink); text-decoration: none; background: transparent; }
.btn:hover { background: var(--ink); color: var(--bg); }
.btn.ghost { border-color: var(--line-strong); color: var(--ink-soft); }
.btn.ghost:hover { background: transparent; color: var(--copper); border-color: var(--copper); }

/* ---------- page header (non-home pages) ---------- */

.page-head { margin-bottom: 36px; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
.page-head h1 { font-family: 'IBM Plex Serif', serif; font-weight: 500; font-size: 30px; margin: 0 0 8px; }
.page-head p { color: var(--ink-soft); margin: 0; max-width: 60ch; font-size: 15.5px; }

.back-link { display: inline-block; font-family: 'IBM Plex Mono', monospace; font-size: 12.5px; color: var(--ink-soft); text-decoration: none; margin-bottom: 16px; }
.back-link:hover { color: var(--copper); }

/* ---------- section shared (home teasers) ---------- */

section.block { padding: 40px 0; border-top: 1px solid var(--line); }
section.block:first-of-type { padding-top: 0; border-top: none; }
.block-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 22px; gap: 12px; }
.block-head h2 { font-family: 'IBM Plex Serif', serif; font-weight: 500; font-size: 22px; margin: 0; }
.block-head .see-all { font-family: 'IBM Plex Mono', monospace; font-size: 12.5px; white-space: nowrap; }

/* ---------- projects ---------- */

.project-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
@media (max-width: 620px) { .project-grid { grid-template-columns: 1fr; } }

.project { position: relative; padding: 20px 20px 20px 22px; background: var(--bg-raised); border: 1px solid var(--line-strong); }
.project::before, .project::after { content: ""; position: absolute; width: 7px; height: 7px; border: 1px solid var(--line-strong); border-radius: 50%; background: var(--bg); }
.project::before { top: -4px; left: -4px; }
.project::after { bottom: -4px; right: -4px; }
.project .path { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--copper); margin-bottom: 6px; display: block; }
.project h3 { margin: 0 0 6px; font-size: 18px; font-weight: 500; }
.project h3 a { color: var(--ink); text-decoration: none; }
.project h3 a:hover { color: var(--copper); }
.project p { margin: 0 0 10px; color: var(--ink-soft); font-size: 15.5px; }
.stack { font-family: 'IBM Plex Mono', monospace; font-size: 11.5px; color: var(--pcb); }
.stack span:not(:last-child)::after { content: " / "; color: var(--line-strong); }

/* ---------- posts ---------- */

.post { display: grid; grid-template-columns: 108px 1fr; gap: 18px; padding: 18px 0; border-bottom: 1px solid var(--line); }
.post:last-child { border-bottom: none; }
.post .date { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--ink-soft); padding-top: 3px; }
.post h3 { margin: 0 0 5px; font-size: 17px; font-weight: 500; }
.post h3 a { color: var(--ink); text-decoration: none; }
.post h3 a:hover { color: var(--copper); }
.post p { margin: 0 0 8px; color: var(--ink-soft); font-size: 15px; }
.tags { font-family: 'IBM Plex Mono', monospace; font-size: 11.5px; }
.tags a { color: var(--pcb); text-decoration: none; margin-right: 10px; }
.tags a:hover { color: var(--copper); }
@media (max-width: 480px) { .post { grid-template-columns: 1fr; gap: 4px; } }

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

.resume-intro { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 34px; }
.resume-intro p { max-width: 52ch; color: var(--ink-soft); margin: 0; font-size: 15.5px; }
.resume-sub { font-family: 'IBM Plex Mono', monospace; font-size: 12px; letter-spacing: 0.02em; color: var(--copper); margin: 34px 0 14px; padding-top: 20px; border-top: 1px solid var(--line); }
.resume-sub:first-of-type { margin-top: 0; padding-top: 0; border-top: none; }
.entry { display: grid; grid-template-columns: 150px 1fr; gap: 18px; padding: 12px 0; }
.entry .when { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--ink-soft); padding-top: 3px; }
.entry h3 { margin: 0 0 3px; font-size: 16.5px; font-weight: 500; }
.entry .org { font-size: 14px; color: var(--ink-soft); margin-bottom: 6px; }
.entry p { margin: 0; font-size: 15px; color: var(--ink-soft); }
.entry .project-links { margin-top: 6px; font-size: 13px; }
.entry.entry-no-when { grid-template-columns: 1fr; }
@media (max-width: 480px) { .entry { grid-template-columns: 1fr; gap: 4px; } }
.skills-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 30px; font-size: 15px; }
.skills-grid dt { font-family: 'IBM Plex Mono', monospace; font-size: 12px; color: var(--copper); margin-bottom: 5px; }
.skills-grid dd { margin: 0; color: var(--ink-soft); }
@media (max-width: 480px) { .skills-grid { grid-template-columns: 1fr; } }

/* ---------- article prose / markdown rendering ---------- */

.prose {
  max-width: var(--content-max);
  margin-top: 24px;
}

.prose h1, .prose h2, .prose h3, .prose h4 {
  font-family: 'IBM Plex Serif', serif;
  font-weight: 500;
  color: var(--ink);
  margin: 32px 0 12px;
}

.prose h1 { font-size: 28px; }
.prose h2 { font-size: 22px; border-bottom: 1px solid var(--line); padding-bottom: 6px; }
.prose h3 { font-size: 19px; }

.prose p {
  margin: 0 0 18px;
  line-height: 1.7;
}

.prose ul, .prose ol {
  margin: 0 0 20px;
  padding-left: 24px;
}

.prose li {
  margin-bottom: 6px;
  color: var(--ink);
}

.prose blockquote {
  margin: 20px 0;
  padding: 12px 20px;
  border-left: 3px solid var(--copper);
  background: var(--bg-raised);
  color: var(--ink-soft);
  font-style: italic;
}

.prose code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.9em;
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--copper);
}

.prose pre {
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  padding: 16px;
  overflow-x: auto;
  border-radius: 4px;
  margin: 20px 0;
}

.prose pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: var(--ink);
  font-size: 13.5px;
}

.prose img {
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  margin: 20px 0;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--line);
  margin: 36px 0;
}

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

footer.site-footer {
  padding: 28px 0 40px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 12px;
  color: var(--ink-soft);
  border-top: 1px solid var(--line);
  margin-top: 20px;
}

/* ---------- attachments & figures ---------- */
.figure-wrap {
  margin: 24px 0;
  padding: 0;
}

.figure-wrap img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
}

.figure-wrap figcaption {
  font-size: 12.5px;
  color: var(--ink-soft);
  margin-top: 8px;
}

/* ---------- math (KaTeX) styling ---------- */
.katex {
  font-size: 1.05em;
  color: var(--ink);
}

.katex-display {
  margin: 20px 0;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 8px 0;
}