/* ===== Design tokens ===== */
:root {
  --bg: #0a0a0b;
  --bg-soft: #141416;
  --surface: #1a1a1d;
  --border: #26262b;
  --text: #e7e7ea;
  --text-dim: #a1a1aa;
  --text-faint: #6b6b73;
  --accent: #7c9cff;
  --accent-soft: rgba(124, 156, 255, 0.12);
  --radius: 12px;
  --maxw: 720px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #fbfbfa;
    --bg-soft: #f2f2f0;
    --surface: #ffffff;
    --border: #e4e4e0;
    --text: #1a1a1a;
    --text-dim: #555;
    --text-faint: #8a8a8a;
    --accent: #3b5bdb;
    --accent-soft: rgba(59, 91, 219, 0.08);
  }
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: -0.011em;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font-weight: 600; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center;
  width: 30px; height: 30px; border-radius: 8px;
  background: var(--accent-soft); color: var(--accent);
  font-family: var(--font-mono); font-size: 13px; font-weight: 600;
}
.brand-name { font-size: 15px; }
.site-nav { display: flex; gap: 6px; }
.site-nav a {
  color: var(--text-dim); font-size: 14px; font-weight: 500;
  padding: 7px 12px; border-radius: 8px;
}
.site-nav a:hover { color: var(--text); background: var(--bg-soft); text-decoration: none; }
.site-nav a.active { color: var(--text); background: var(--bg-soft); }
.site-nav a.lang-switch {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em;
  border: 1px solid var(--border); margin-left: 6px; padding: 6px 10px;
}
.site-nav a.lang-switch:hover { border-color: var(--text-faint); color: var(--text); }

/* ===== Main ===== */
.site-main { min-height: 70vh; padding: 72px 0 96px; }

/* ===== Hero ===== */
.hero { margin-bottom: 64px; }
.hero .eyebrow {
  font-family: var(--font-mono); font-size: 13px; color: var(--accent);
  letter-spacing: 0.02em; margin: 0 0 14px;
}
.hero h1 {
  font-size: clamp(2.1rem, 6vw, 3.1rem); line-height: 1.08;
  font-weight: 700; letter-spacing: -0.03em; margin: 0 0 8px;
}
.hero .role { font-size: clamp(1.2rem, 3vw, 1.5rem); color: var(--text-dim); font-weight: 500; margin: 0 0 22px; }
.hero .lead { font-size: 1.08rem; color: var(--text-dim); max-width: 60ch; margin: 0 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px;
  background: var(--accent); color: #fff; font-size: 14px; font-weight: 600;
  border: 1px solid transparent; transition: transform .12s ease, opacity .12s ease;
}
.btn:hover { text-decoration: none; opacity: .92; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { border-color: var(--text-faint); }

/* ===== Sections ===== */
.section { margin-bottom: 60px; }
.section-title {
  font-size: 13px; font-family: var(--font-mono); text-transform: uppercase;
  letter-spacing: 0.08em; color: var(--text-faint); margin: 0 0 22px;
  display: flex; align-items: center; gap: 12px;
}
.section-title::after { content: ""; flex: 1; height: 1px; background: var(--border); }
.section p { color: var(--text-dim); }

/* ===== Skills ===== */
.skill-grid { display: flex; flex-wrap: wrap; gap: 10px; }
.skill {
  font-family: var(--font-mono); font-size: 13px; color: var(--text-dim);
  padding: 7px 13px; border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg-soft);
}

/* ===== Experience / timeline ===== */
.entry { padding: 18px 0; border-bottom: 1px solid var(--border); }
.entry:last-child { border-bottom: none; }
.entry-head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
.entry-role { font-weight: 600; color: var(--text); margin: 0; font-size: 1.05rem; }
.entry-org { color: var(--accent); }
.entry-date { font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); white-space: nowrap; }
.entry p { margin: 8px 0 0; font-size: 0.97rem; }

/* ===== Card list (blog & projects) ===== */
.card-list { display: grid; gap: 4px; }
.card {
  display: block; padding: 22px; margin: 0 -22px; border-radius: var(--radius);
  border: 1px solid transparent; transition: background .14s ease, border-color .14s ease;
}
.card:hover { background: var(--bg-soft); border-color: var(--border); text-decoration: none; }
.card-title { font-size: 1.18rem; font-weight: 600; color: var(--text); margin: 0 0 6px; }
.card:hover .card-title { color: var(--accent); }
.card-summary { color: var(--text-dim); font-size: 0.97rem; margin: 0 0 12px; }
.card-meta { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; font-size: 13px; color: var(--text-faint); font-family: var(--font-mono); }

/* ===== Tags ===== */
.tag {
  display: inline-block; font-family: var(--font-mono); font-size: 12px;
  color: var(--text-dim); background: var(--accent-soft);
  padding: 3px 9px; border-radius: 6px; margin-right: 6px;
}
.dot { color: var(--text-faint); }

/* ===== Page heading ===== */
.page-head { margin-bottom: 40px; }
.page-head h1 { font-size: clamp(1.8rem, 5vw, 2.4rem); letter-spacing: -0.02em; margin: 0 0 8px; }
.page-head p { color: var(--text-dim); margin: 0; }

/* ===== Post / Project article ===== */
.post-header { margin-bottom: 36px; }
.back-link { font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); }
.back-link:hover { color: var(--accent); }
.post-title { font-size: clamp(1.8rem, 5vw, 2.6rem); line-height: 1.12; letter-spacing: -0.025em; margin: 16px 0 12px; }
.post-summary { font-size: 1.1rem; color: var(--text-dim); margin: 0 0 14px; }
.post-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 13px; color: var(--text-faint); }
.project-actions { display: flex; gap: 12px; margin-top: 20px; }

/* ===== Prose (markdown content) ===== */
.prose { font-size: 1.05rem; color: var(--text); }
.prose > * + * { margin-top: 1.2em; }
.prose h2 { font-size: 1.5rem; letter-spacing: -0.02em; margin-top: 2em; }
.prose h3 { font-size: 1.2rem; margin-top: 1.6em; }
.prose p, .prose li { color: var(--text-dim); }
.prose strong { color: var(--text); }
.prose a { text-decoration: underline; text-underline-offset: 3px; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li + li { margin-top: 0.4em; }
.prose blockquote {
  border-left: 3px solid var(--accent); margin: 1.5em 0; padding: 4px 0 4px 20px;
  color: var(--text-dim); font-style: italic;
}
.prose img { border-radius: var(--radius); border: 1px solid var(--border); }
.prose code {
  font-family: var(--font-mono); font-size: 0.88em;
  background: var(--bg-soft); padding: 2px 6px; border-radius: 6px; color: var(--text);
}
.prose pre {
  background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; overflow-x: auto; font-size: 0.9rem; line-height: 1.6;
}
.prose pre code { background: none; padding: 0; font-size: inherit; }
.prose hr { border: none; border-top: 1px solid var(--border); margin: 2.5em 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.prose th { background: var(--bg-soft); }

/* ===== Footer ===== */
.site-footer { border-top: 1px solid var(--border); padding: 40px 0; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-dim); font-size: 14px; }
.footer-links a:hover { color: var(--accent); text-decoration: none; }
.footer-note { color: var(--text-faint); font-size: 13px; margin: 0; }

/* ===== Responsive ===== */
@media (max-width: 600px) {
  body { font-size: 16px; }
  .site-main { padding: 48px 0 64px; }
  .brand-name { display: none; }
  .card { margin: 0; padding: 18px 0; border-radius: 0; border-top: none; border-bottom: 1px solid var(--border); }
  .card:hover { background: none; border-color: var(--border); }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}