/* ===== tokens ===== */
:root {
  --paper: #f1f2ed;
  --paper-raised: #e8e9e2;
  --ink: #14171c;
  --ink-dim: #565c66;
  --line: #d3d5cc;
  --signal: #b5690f;
  --signal-soft: #e8dcc8;
  --ok: #2f6f60;

  --font-mono: 'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Menlo, Consolas, monospace;
  --font-sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --container: 720px;
  --radius: 8px;
}

:root[data-theme="dark"] {
  --paper: #12151a;
  --paper-raised: #191d24;
  --ink: #e7e8e2;
  --ink-dim: #9aa0aa;
  --line: #2b2f37;
  --signal: #e3a052;
  --signal-soft: #3a2f22;
  --ok: #63b3a0;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #12151a;
    --paper-raised: #191d24;
    --ink: #e7e8e2;
    --ink-dim: #9aa0aa;
    --line: #2b2f37;
    --signal: #e3a052;
    --signal-soft: #3a2f22;
    --ok: #63b3a0;
  }
}

/* ===== reset ===== */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  transition: background-color .2s ease, color .2s ease;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
code { font-family: var(--font-mono); }
ul, ol, dl { margin: 0; padding: 0; }
h1, h2, h3, p { margin: 0; }

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

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

.wrap {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}
.logo {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.05rem;
  text-decoration: none;
  letter-spacing: 0.02em;
}
.logo__dot { color: var(--signal); }
.nav {
  display: none;
  gap: 24px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.nav a { text-decoration: none; color: var(--ink-dim); }
.nav a:hover { color: var(--ink); }
@media (min-width: 640px) {
  .nav { display: flex; }
}
.theme-toggle {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-dim);
  padding: 6px 12px;
  cursor: pointer;
}
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-dim); }

/* ===== hero ===== */
.hero {
  padding: 72px 24px 56px;
}
.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--ink-dim);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}
.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--ink-dim);
  flex: none;
}
.dot--current { background: var(--signal); box-shadow: 0 0 0 3px var(--signal-soft); }
.dot--ok { background: var(--ok); }

.hero__name {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(2.1rem, 6vw, 3.2rem);
  letter-spacing: -0.01em;
  line-height: 1.05;
  margin-bottom: 20px;
}

.hero__bio {
  max-width: 46ch;
  font-size: 1.1rem;
  color: var(--ink-dim);
  margin-bottom: 32px;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 44px;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  transition: border-color .15s ease, background-color .15s ease;
}
.pill svg { width: 15px; height: 15px; fill: currentColor; }
.pill:hover { border-color: var(--ink-dim); background: var(--paper-raised); }
.pill--accent {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--paper);
}
.pill--accent:hover { background: color-mix(in srgb, var(--signal) 85%, black); border-color: var(--signal); }

.impact {
  border-top: 1px solid var(--line);
  padding-top: 28px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 20px;
}
.impact__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding-left: 16px;
  border-left: 2px solid var(--signal);
}
.impact__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.9rem, 5vw, 2.4rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--ink);
}
.impact__num small { font-size: 0.55em; font-weight: 600; color: var(--signal); }
.impact__label {
  font-size: 0.88rem;
  color: var(--ink-dim);
  max-width: 22ch;
}
.impact__tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--ink-dim);
  opacity: 0.7;
  margin-top: 2px;
}
@media (min-width: 640px) {
  .impact { grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 24px; }
  .impact__label { max-width: none; }
}

.impact--ok .impact__item { border-left-color: var(--ok); }
.impact--ok .impact__num small { color: var(--ok); }

/* ===== journey / railway ===== */
.railway {
  list-style: none;
  display: grid;
  gap: 28px;
  position: relative;
  padding-left: 22px;
}
.railway::before {
  content: '';
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 3px;
  width: 2px;
  background: var(--line);
}
.railway__node { position: relative; }
.railway__node::before {
  content: '';
  position: absolute;
  top: 5px;
  left: -22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-dim);
}
.railway__node--current::before {
  background: var(--signal);
  box-shadow: 0 0 0 3px var(--signal-soft);
}
.railway__tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--signal);
  font-weight: 600;
}
.railway__year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-dim);
  margin-left: 8px;
}
.railway__node h3 { font-size: 1rem; font-weight: 600; margin: 6px 0 2px; }
.railway__node p { color: var(--ink-dim); font-size: 0.9rem; }

@media (min-width: 700px) {
  .railway {
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding-left: 0;
    padding-top: 20px;
  }
  .railway::before {
    top: 4px; bottom: auto; left: 0; right: 0; width: auto; height: 2px;
  }
  .railway__node::before { top: -16px; left: 0; }
}

/* ===== sections ===== */
.section { padding: 56px 24px; border-top: 1px solid var(--line); }
.section__title { margin-bottom: 32px; }
.section__index {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--ink-dim);
}
.section__index::before {
  content: '// ';
  color: var(--signal);
}

/* ===== timeline ===== */
.timeline { list-style: none; display: grid; gap: 40px; }
.entry__meta {
  display: flex;
  align-items: center;
  gap: 9px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-dim);
  margin-bottom: 8px;
  flex-wrap: wrap;
}
.entry__status { text-transform: uppercase; letter-spacing: 0.06em; }
.entry__dates { margin-left: auto; }
.entry__role { font-size: 1.15rem; font-weight: 600; margin-bottom: 2px; }
.entry__org { color: var(--ink-dim); margin-bottom: 14px; font-size: 0.95rem; }
.entry__points { list-style: none; display: grid; gap: 10px; }
.entry__points li {
  position: relative;
  padding-left: 18px;
  color: var(--ink-dim);
  font-size: 0.96rem;
}
.entry__points li::before {
  content: '·';
  position: absolute;
  left: 4px;
  color: var(--signal);
  font-weight: 700;
}
.entry__points code {
  background: var(--paper-raised);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 0.88em;
  color: var(--ink);
}

/* ===== projects ===== */
.cards { display: grid; gap: 20px; margin-bottom: 24px; }
@media (min-width: 700px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  background: var(--paper-raised);
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.card__head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.card__head h3 { font-family: var(--font-mono); font-size: 1.05rem; font-weight: 600; }
.card__date { font-family: var(--font-mono); font-size: 0.75rem; color: var(--ink-dim); white-space: nowrap; }
.card__desc { color: var(--ink-dim); font-size: 0.95rem; }
.card__deps {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--ink-dim);
  border-top: 1px dashed var(--line);
  padding-top: 12px;
  margin-top: auto;
}
.more-link { font-size: 0.92rem; color: var(--ink-dim); }
.more-link a { color: var(--signal); text-decoration: none; }
.more-link a:hover { text-decoration: underline; }

/* ===== skills ===== */
.skill-grid { display: grid; gap: 28px; }
@media (min-width: 700px) {
  .skill-grid { grid-template-columns: 1fr 1fr; }
}
.skill-group h3 {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-dim);
  margin-bottom: 10px;
}
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 5px 10px;
  color: var(--ink);
}

/* ===== education ===== */
.edu h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 4px; }
.edu p { color: var(--ink-dim); }
.edu__meta { font-family: var(--font-mono); font-size: 0.85rem; margin-top: 4px; }

/* ===== footer ===== */
.site-footer { border-top: 1px solid var(--line); padding: 32px 24px 48px; }
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  justify-content: space-between;
  align-items: center;
  font-size: 0.88rem;
  color: var(--ink-dim);
}
.link-row--footer {
  display: flex;
  gap: 18px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  margin-bottom: 0;
}
.link-row--footer a { text-decoration: none; color: var(--ink-dim); }
.link-row--footer a:hover { color: var(--signal); }