:root {
  --bg: #ffffff;
  --ink: #15181d;
  --ink-soft: #5b6573;
  --surface: #ffffff;
  --surface-2: #f3f4f6;
  --line-subtle: #e5e7eb;
  --brand: #0f766e;
  --accent: #0f766e;
  --accent-2: #0f766e;
  --badge-bg: #e6f4f1;
  --badge-ink: #0f6a5f;
  --radius-card: 14px;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 24px rgba(0, 0, 0, 0.06);
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-caption: 0.8125rem;
  --text-label: 0.75rem;
  --text-small: 0.9375rem;
  --text-body: 1rem;
  --text-body-lg: 1.0625rem;
  --text-subhead: 1.05rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0b0d10;
    --ink: #e8eaed;
    --ink-soft: #9aa3af;
    --surface: #111418;
    --surface-2: #161a1f;
    --line-subtle: #242a31;
    --badge-bg: #10332c;
    --badge-ink: #6fd6c4;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

:root[data-theme="dark"] {
  --bg: #0b0d10;
  --ink: #e8eaed;
  --ink-soft: #9aa3af;
  --surface: #111418;
  --surface-2: #161a1f;
  --line-subtle: #242a31;
  --badge-bg: #10332c;
  --badge-ink: #6fd6c4;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--brand); text-decoration: underline; }
::selection { background: var(--accent); color: #fff; }

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

.wrap { max-width: 980px; margin: 0 auto; padding: 0 clamp(20px, 5vw, 64px); }

header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--bg);
  border-bottom: 1px solid var(--line-subtle);
}

nav {
  max-width: 980px;
  margin: 0 auto;
  padding: 12px clamp(20px, 5vw, 64px);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  font-weight: 800;
  font-size: 1.05rem;
  color: var(--ink);
  letter-spacing: -0.01em;
  flex: 0 0 auto;
}

.nav-links {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--text-small);
  font-weight: 600;
  white-space: nowrap;
  scrollbar-width: none;
}
.nav-links a { color: var(--ink-soft); }

.theme-toggle {
  flex: 0 0 auto;
  font: inherit;
  font-size: var(--text-caption);
  font-weight: 600;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-subtle);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
}

section {
  scroll-margin-top: 72px;
  padding: 56px 0;
  border-top: 1px solid var(--line-subtle);
}

.hero {
  padding: clamp(56px, 10vw, 112px) 0 clamp(48px, 8vw, 88px);
  display: flex;
  flex-wrap: wrap-reverse;
  align-items: center;
  gap: 40px;
  border-top: none;
}
.hero-text { flex: 1 1 420px; min-width: 0; }
.hero-photo {
  flex: 0 0 auto;
  width: clamp(140px, 26vw, 240px);
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-card);
  border: 1px solid var(--line-subtle);
  box-shadow: var(--shadow);
  background: var(--surface-2);
}

.eyebrow {
  display: block;
  font-size: var(--text-caption);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 10px;
}
.display {
  margin: 0 0 14px;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.subtitle, .body-text {
  margin: 0;
  max-width: 62ch;
  font-size: var(--text-body-lg);
  line-height: 1.65;
  color: var(--ink-soft);
}

.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 32px; }
.btn-cta {
  display: inline-flex;
  align-items: center;
  background: var(--brand);
  color: #fff;
  border-radius: 999px;
  padding: 10px 20px;
  font-weight: 600;
  font-size: var(--text-small);
  text-decoration: none;
}
.btn-cta:hover { color: #fff; text-decoration: none; opacity: 0.9; }
.tag {
  display: inline-flex;
  align-items: center;
  background: var(--surface-2);
  color: var(--ink);
  border: 1px solid var(--line-subtle);
  border-radius: 999px;
  padding: 8px 16px;
  font-size: var(--text-small);
  font-weight: 600;
}
.tag:hover { text-decoration: none; color: var(--ink); background: var(--line-subtle); }

.kv-rows { margin-top: 20px; display: flex; flex-direction: column; gap: 12px; }
.kv-row { display: flex; gap: 16px; font-size: var(--text-body); }
.kv-row dt { flex: 0 0 110px; font-weight: 700; color: var(--ink-soft); text-transform: uppercase; font-size: var(--text-caption); letter-spacing: 0.03em; }
.kv-row dd { margin: 0; color: var(--ink); }

.grid-2 { margin-top: 24px; display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
@media (max-width: 560px) { .grid-2 { grid-template-columns: 1fr; } }
.skill-card {
  background: var(--surface);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 18px 20px;
}
.skill-card h4 { margin: 0 0 6px; font-size: var(--text-small); font-weight: 700; color: var(--ink); }
.skill-card p { margin: 0; font-size: var(--text-body); color: var(--ink-soft); }

.project-card {
  margin-top: 28px;
  background: var(--surface);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: clamp(22px, 4vw, 36px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.project-head { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px; }
.project-head h3 { margin: 0; font-size: 1.5rem; font-weight: 800; letter-spacing: -0.01em; }
.project-head a { font-weight: 600; font-size: var(--text-small); }
.project-card p { margin: 0; max-width: 62ch; font-size: var(--text-body-lg); line-height: 1.65; color: var(--ink-soft); }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-row code {
  font-family: var(--mono);
  font-size: var(--text-caption);
  background: var(--surface-2);
  color: var(--ink);
  border-radius: 4px;
  padding: 2px 8px;
}
.feature-grid {
  margin: 0;
  padding-top: 18px;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 14px;
  border-top: 1px solid var(--line-subtle);
}
.feature-grid li { font-size: var(--text-body); line-height: 1.5; color: var(--ink); }

.timeline { margin-top: 28px; display: flex; flex-direction: column; border-top: 1px solid var(--line-subtle); }
.timeline-row { display: flex; flex-wrap: wrap; gap: 8px 32px; padding: 28px 0; border-bottom: 1px solid var(--line-subtle); }
.timeline-period { flex: 0 0 170px; font-family: var(--mono); font-size: var(--text-caption); color: var(--ink-soft); padding-top: 4px; }
.timeline-roles { flex: 1 1 360px; min-width: 0; display: flex; flex-direction: column; gap: 22px; }
.role-company { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.role-company h3 { margin: 0; font-size: 1.3rem; font-weight: 800; letter-spacing: -0.01em; }
.badge-current { font-size: var(--text-label); font-weight: 600; color: var(--badge-ink); background: var(--badge-bg); border-radius: 4px; padding: 3px 8px; }
.role-title-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 12px; }
.role-title { font-size: var(--text-subhead); font-weight: 600; color: var(--accent); }
.role-period { font-family: var(--mono); font-size: var(--text-label); color: var(--ink-soft); }
.role-meta { font-size: var(--text-small); color: var(--ink-soft); line-height: 1.5; }
.role-bullets { margin: 6px 0 0; padding-left: 18px; display: flex; flex-direction: column; gap: 6px; max-width: 62ch; }
.role-bullets li { font-size: var(--text-body); line-height: 1.55; color: var(--ink); }

.gh-loading, .gh-error { font-size: var(--text-body); color: var(--ink-soft); }

.blog-posts { margin: 24px 0 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.blog-post {
  background: var(--surface);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}
.blog-post img { width: 100%; aspect-ratio: 16/9; object-fit: cover; background: var(--surface-2); }
.blog-post-body { padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; }
.blog-post-date { font-family: var(--mono); font-size: var(--text-caption); color: var(--ink-soft); }
.blog-post a.blog-post-title { font-size: var(--text-small); font-weight: 700; color: var(--ink); line-height: 1.35; }
.blog-post a.blog-post-title:hover { color: var(--accent); }
.blog-post p { margin: 0; font-size: var(--text-caption); color: var(--ink-soft); line-height: 1.5; }

.edu-grid { margin-top: 28px; display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; }
.edu-card {
  background: var(--surface);
  border: 1px solid var(--line-subtle);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow);
  padding: 20px 22px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.edu-card .edu-date { font-family: var(--mono); font-size: var(--text-caption); color: var(--accent-2); }
.edu-card h4 { margin: 0; font-size: 1.15rem; font-weight: 600; color: var(--ink); }
.edu-card .edu-org { font-size: var(--text-body); color: var(--ink-soft); }

footer {
  border-top: 1px solid var(--line-subtle);
}
.footer-row {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px clamp(20px, 5vw, 64px);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  font-size: var(--text-caption);
  color: var(--ink-soft);
}
.footer-row a { color: var(--ink-soft); }