/* ---------------------------------------------------------------
   Notion-style design tokens
   --------------------------------------------------------------- */
:root {
  --bg: #ffffff;
  --text: #37352f;
  --text-secondary: #787774;
  --text-faint: #9b9a97;
  --border: rgba(55, 53, 47, 0.09);
  --border-strong: rgba(55, 53, 47, 0.16);
  --hover: rgba(55, 53, 47, 0.06);
  --pill-bg: rgba(55, 53, 47, 0.06);
  --link: #37352f;
  --accent: #2383e2;
  --card-bg: #ffffff;
  --code-bg: #f7f6f3;
  --max-width: 720px;
  --font: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    Helvetica, "Apple Color Emoji", Arial, sans-serif, "Segoe UI Emoji";
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

[data-theme="dark"] {
  --bg: #191919;
  --text: rgba(255, 255, 255, 0.87);
  --text-secondary: rgba(255, 255, 255, 0.5);
  --text-faint: rgba(255, 255, 255, 0.34);
  --border: rgba(255, 255, 255, 0.1);
  --border-strong: rgba(255, 255, 255, 0.18);
  --hover: rgba(255, 255, 255, 0.055);
  --pill-bg: rgba(255, 255, 255, 0.08);
  --link: rgba(255, 255, 255, 0.87);
  --card-bg: #202020;
  --code-bg: #2625220f;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.15s ease;
}

.page {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 96px;
}

a { color: var(--link); }

/* minimal external-link glyph: inherits text color, never an emoji */
.ext-arrow {
  display: inline-block;
  width: 0.72em;
  height: 0.72em;
  vertical-align: -0.02em;
  margin-left: 2px;
  opacity: 0.5;
  transition: opacity 0.1s ease;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ------------------------- top nav (sticky + scroll-spy) ------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  font-size: 14px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-links a.active {
  background: var(--pill-bg);
  color: var(--text);
}
@media (max-width: 600px) {
  .nav { gap: 10px; }
  .nav-name { flex-shrink: 0; }
  /* links become a horizontally scrollable chip row; name stays pinned left */
  .nav-links {
    min-width: 0;
    flex: 1 1 auto;
    justify-content: flex-start;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }
  .nav-links::-webkit-scrollbar { display: none; }
  .nav-links a { flex-shrink: 0; }
  .theme-toggle { flex-shrink: 0; }

  /* scroll affordance: fade the edge(s) that have more content off-screen.
     Classes toggled by app.js based on scroll position. */
  .nav-links.show-right {
    -webkit-mask-image: linear-gradient(to right, #000 80%, transparent);
    mask-image: linear-gradient(to right, #000 80%, transparent);
  }
  .nav-links.show-left {
    -webkit-mask-image: linear-gradient(to left, #000 80%, transparent);
    mask-image: linear-gradient(to left, #000 80%, transparent);
  }
  .nav-links.show-left.show-right {
    -webkit-mask-image: linear-gradient(to right, transparent, #000 14%, #000 86%, transparent);
    mask-image: linear-gradient(to right, transparent, #000 14%, #000 86%, transparent);
  }
}
.nav-name {
  font-weight: 600;
  text-decoration: none;
}
.nav-links {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav-links a,
.theme-toggle {
  color: var(--text-secondary);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background 0.1s ease;
  background: none;
  border: none;
  font: inherit;
  font-size: 14px;
  cursor: pointer;
}
.nav-links a:hover,
.theme-toggle:hover { background: var(--hover); color: var(--text); }

/* ------------------------- hero ------------------------- */
.hero { padding: 56px 0 24px; }
.hero h1 {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 8px;
}
.hero .role {
  font-size: 17px;
  color: var(--text-secondary);
  margin: 0 0 16px;
}
.hero .intro {
  margin: 0 0 20px;
  max-width: 600px;
}

/* ------------------------- availability status ------------------------- */
.hero-availability { margin: 0 0 18px; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px; }
.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
  border-radius: 999px;
  padding: 4px 12px;
  white-space: nowrap;
}
.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent);
  animation: pulse 2.4s ease-out infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 55%, transparent); }
  70% { box-shadow: 0 0 0 6px transparent; }
  100% { box-shadow: 0 0 0 0 transparent; }
}
.status-detail { font-size: 13.5px; color: var(--text-faint); }
@media (max-width: 540px) { .status-pill { white-space: normal; } }
.hero-links { display: flex; flex-wrap: wrap; gap: 8px; }
.hero-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  text-decoration: none;
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 5px 12px;
  transition: background 0.1s ease;
}
.hero-links a:hover { background: var(--hover); }
.hero-links a.primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}
.hero-links a.primary:hover { opacity: 0.85; }

/* ------------------------- sections ------------------------- */
section { margin-top: 48px; scroll-margin-top: 64px; }
.section-title {
  display: flex;
  align-items: center;
  gap: 9px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin: 0 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
/* short accent bar before each section label (matches favicon + social cards) */
.section-title::before {
  content: "";
  flex-shrink: 0;
  width: 16px;
  height: 3px;
  border-radius: 2px;
  background: var(--accent);
}

/* ------------------------- project cards ------------------------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 640px) {
  .projects-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
}

.project-card {
  display: block;
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--card-bg);
  transition: background 0.1s ease, border-color 0.1s ease;
}
.project-card:hover {
  background: var(--hover);
  border-color: var(--border-strong);
}
.project-thumb {
  aspect-ratio: 16 / 9;
  width: 100%;
  object-fit: cover;
  display: block;
  border-bottom: 1px solid var(--border);
  background: var(--code-bg);
}
.project-body { padding: 14px 16px 16px; }
.project-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px;
  margin: 0 0 2px;
}
.project-body h3 {
  margin: 0;
  font-size: 15.5px;
  font-weight: 600;
}
.card-badge {
  flex-shrink: 0;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-faint);
  background: var(--pill-bg);
  border-radius: 4px;
  padding: 2px 7px;
  white-space: nowrap;
}
.card-badge.code { color: var(--accent); background: color-mix(in srgb, var(--accent) 9%, transparent); }
.project-body .subtitle {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 0 8px;
}
.project-body .summary {
  font-size: 13.5px;
  color: var(--text-secondary);
  margin: 0 0 10px;
  line-height: 1.5;
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-size: 11.5px;
  color: var(--text-secondary);
  background: var(--pill-bg);
  border-radius: 4px;
  padding: 2px 7px;
  white-space: nowrap;
}

/* ------------------------- section intro ------------------------- */
.section-intro {
  font-size: 14px;
  color: var(--text-secondary);
  margin: -4px 0 16px;
  max-width: 600px;
}

/* ------------------------- open source (compact, link-out) ------------------------- */
.oss-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
@media (max-width: 640px) { .oss-grid { grid-template-columns: 1fr; } }
.oss-item {
  display: block;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 13px 15px;
  background: var(--card-bg);
  transition: background 0.1s ease, border-color 0.1s ease;
}
.oss-item:hover { background: var(--hover); border-color: var(--border-strong); }
.oss-head { display: flex; align-items: baseline; justify-content: space-between; gap: 10px; }
.oss-name { font-size: 14.5px; font-weight: 600; font-family: var(--mono); }
.oss-item:hover .ext-arrow { opacity: 0.9; }
.oss-meta { flex-shrink: 0; display: flex; align-items: baseline; gap: 9px; }
.oss-stars { font-size: 12px; color: var(--text-secondary); white-space: nowrap; }
.oss-lang {
  font-size: 12px;
  color: var(--text-faint);
}
.oss-desc { font-size: 13px; color: var(--text-secondary); margin: 6px 0 8px; line-height: 1.5; }
.oss-item .tags { margin-top: 2px; }

/* ------------------------- list rows (experience, writing) ------------------------- */
.row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 16px;
  padding: 14px 8px;
  margin: 0 -8px;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.1s ease;
}
a.row:hover { background: var(--hover); }
.row + .row { border-top: 1px solid var(--border); }
.row .when {
  font-size: 13.5px;
  color: var(--text-faint);
  padding-top: 2px;
  white-space: nowrap;
}
.row h3 { margin: 0; font-size: 15.5px; font-weight: 600; }
.row .where { font-size: 14px; color: var(--text-secondary); margin: 1px 0 0; }
.row .desc { font-size: 13.5px; color: var(--text-secondary); margin: 6px 0 0; }
@media (max-width: 540px) {
  .row { grid-template-columns: 1fr; gap: 2px; }
}

/* ------------------------- skills ------------------------- */
.skill-group { display: grid; grid-template-columns: 150px 1fr; gap: 12px; padding: 8px 0; font-size: 14px; }
.skill-group .label { color: var(--text-faint); font-size: 13.5px; padding-top: 1px; }
.skill-group .items { color: var(--text); }
@media (max-width: 540px) { .skill-group { grid-template-columns: 1fr; gap: 0; } }

/* ------------------------- footer ------------------------- */
footer {
  margin-top: 72px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 13.5px;
  color: var(--text-faint);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
}
footer a { color: var(--text-secondary); text-decoration: none; }
footer a:hover { color: var(--text); }

/* ------------------------- project detail page ------------------------- */
.back-link {
  display: inline-block;
  font-size: 14px;
  color: var(--text-secondary);
  text-decoration: none;
  margin: 24px 0 8px;
  padding: 4px 8px;
  margin-left: -8px;
  border-radius: 4px;
}
.back-link:hover { background: var(--hover); }

.article { padding-bottom: 40px; }
.article-header { margin: 16px 0 8px; }
.article-header h1 {
  font-size: 34px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0 0 6px;
}
.article-header .subtitle { font-size: 16px; color: var(--text-secondary); margin: 0 0 14px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 24px; }
.article-meta a {
  font-size: 13.5px;
  text-decoration: none;
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  padding: 3px 10px;
}
.article-meta a:hover { background: var(--hover); }
.article-cover {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--border);
  margin-bottom: 28px;
  display: block;
}

/* rendered markdown */
.md h2 { font-size: 22px; font-weight: 600; margin: 36px 0 8px; letter-spacing: -0.01em; }
.md h3 { font-size: 17px; font-weight: 600; margin: 24px 0 6px; }
.md p { margin: 0 0 14px; }
.md ul, .md ol { margin: 0 0 14px; padding-left: 24px; }
.md li { margin: 3px 0; }
.md img { max-width: 100%; border-radius: 8px; border: 1px solid var(--border); margin: 8px 0; }
.md code {
  font-family: var(--mono);
  font-size: 85%;
  background: var(--pill-bg);
  border-radius: 4px;
  padding: 2px 5px;
  color: #eb5757;
}
.md pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
}
.md pre code { background: none; padding: 0; color: var(--text); font-size: 13px; }
.md blockquote {
  margin: 0 0 14px;
  padding-left: 14px;
  border-left: 3px solid var(--text);
  color: var(--text);
}
.md hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.md a { color: var(--text); text-decoration: underline; text-decoration-color: var(--text-faint); text-underline-offset: 2px; }
.md a:hover { text-decoration-color: var(--text); }
.md table { border-collapse: collapse; width: 100%; font-size: 14px; margin: 0 0 14px; }
.md th, .md td { border: 1px solid var(--border-strong); padding: 6px 10px; text-align: left; }
.md th { background: var(--code-bg); font-weight: 600; }

/* ------------------------- back-to-top button ------------------------- */
.to-top {
  position: fixed;
  bottom: 22px;
  right: 22px;
  z-index: 30;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  background: var(--card-bg);
  color: var(--text-secondary);
  cursor: pointer;
  opacity: 0;
  transform: translateY(8px);
  pointer-events: none;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
  transition: opacity 0.2s ease, transform 0.2s ease, background 0.1s ease, color 0.1s ease;
}
[data-theme="dark"] .to-top { box-shadow: 0 2px 12px rgba(0, 0, 0, 0.4); }
.to-top.visible { opacity: 1; transform: none; pointer-events: auto; }
.to-top:hover { background: var(--hover); color: var(--text); }
.to-top:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) { .to-top { transition: opacity 0.2s ease; transform: none; } }

/* ------------------------- mobile polish ------------------------- */
@media (max-width: 600px) {
  .page { padding: 0 18px 80px; }

  /* comfortable touch targets */
  .nav-links a { padding: 6px 10px; }
  .hero-links a { padding: 9px 15px; font-size: 14.5px; }
  .article-meta a { padding: 8px 13px; font-size: 14px; }
  .back-link { padding: 8px 10px; margin-left: -10px; }

  /* headings scale down a touch */
  .hero h1 { font-size: 30px; }
  .article-header h1 { font-size: 27px; }
  .md h2 { font-size: 20px; margin-top: 30px; }

  /* wide tables (if any) scroll instead of overflowing the page */
  .md table { display: block; overflow-x: auto; white-space: nowrap; }

  .to-top { bottom: 16px; right: 16px; }
}