@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500&family=IBM+Plex+Sans:ital,wght@0,300;0,400;0,500;1,300&display=swap');

/* ─────────────────────────────────────────
   TOKENS — light mode default
───────────────────────────────────────── */
:root {
  --bg:      #ffffff;
  --bg2:     #f5f5f3;
  --border:  #e4e4e0;
  --text:    #1a1a1a;
  --muted:   #888;
  --dim:     #bbb;

  --mono: 'IBM Plex Mono', monospace;
  --sans: 'IBM Plex Sans', system-ui, sans-serif;
  --col:  720px;
}

/* ─────────────────────────────────────────
   TOKENS — dark mode
   The logo SVG has near-black (#110f0d) text and grey (#918f90) axes.
   In dark mode we invert it to white text + lighter grey axes.
───────────────────────────────────────── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:      #141414;
    --bg2:     #1c1c1c;
    --border:  #2c2c2c;
    --text:    #e0e0e0;
    --muted:   #777;
    --dim:     #444;
  }
  .nav-logo img {
    /* Invert near-black to near-white; grey axes stay visible */
    filter: invert(1) brightness(1.1);
  }
  .post-card:hover .post-title { color: #fff; }
}

/* ─────────────────────────────────────────
   RESET
───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }

/* ─────────────────────────────────────────
   NAV
───────────────────────────────────────── */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--col);
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; }
.nav-logo img {
  height: 22px;
  width: auto;
  display: block;
  transition: opacity 0.15s;
}
.nav-logo:hover img { opacity: 0.6; }

.nav-links { display: flex; gap: 24px; }
.nav-links a {
  font-family: var(--mono);
  font-size: 0.69rem;
  color: var(--muted);
  letter-spacing: 0.06em;
  transition: color 0.15s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--text); }

/* ─────────────────────────────────────────
   LAYOUT
───────────────────────────────────────── */
.page { padding-top: 56px; }

.col {
  max-width: var(--col);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0;
}

/* ─────────────────────────────────────────
   HERO
───────────────────────────────────────── */
.hero {
  padding: 80px 24px 64px;
  max-width: var(--col);
  margin: 0 auto;
}
.hero-tag {
  font-family: var(--mono);
  font-size: 0.67rem;
  color: var(--dim);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}
.hero h1 {
  font-weight: 300;
  font-size: clamp(1.8rem, 3.6vw, 2.6rem);
  line-height: 1.22;
  letter-spacing: -0.025em;
  max-width: 480px;
}
.hero h1 strong { font-weight: 500; }
.hero-sub {
  margin-top: 18px;
  max-width: 420px;
  font-size: 0.92rem;
  color: var(--muted);
  line-height: 1.8;
}
.hero-cta {
  margin-top: 30px;
  display: flex; gap: 10px; flex-wrap: wrap;
}
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--text);
  border: 1px solid var(--border);
  padding: 8px 16px;
  border-radius: 2px;
  transition: border-color 0.15s;
  letter-spacing: 0.02em;
}
.btn:hover { border-color: var(--muted); }

/* ─────────────────────────────────────────
   SECTION
───────────────────────────────────────── */
.section {
  padding: 56px 24px;
  max-width: var(--col);
  margin: 0 auto;
}
.section-label {
  font-family: var(--mono);
  font-size: 0.64rem;
  color: var(--dim);
  letter-spacing: 0.14em;
  margin-bottom: 28px;
}

/* ─────────────────────────────────────────
   SKILLS GRID
───────────────────────────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.skill {
  background: var(--bg);
  padding: 24px 22px 28px;
  transition: background 0.15s;
}
.skill:hover { background: var(--bg2); }
.skill-name {
  font-family: var(--mono);
  font-size: 0.71rem;
  font-weight: 500;
  color: var(--text);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}
.skill-desc {
  font-size: 0.86rem;
  color: var(--muted);
  line-height: 1.75;
}
.skill-tags {
  margin-top: 12px;
  display: flex; gap: 5px; flex-wrap: wrap;
}
.stag {
  font-family: var(--mono);
  font-size: 0.59rem;
  color: var(--dim);
  border: 1px solid var(--border);
  padding: 2px 6px;
}

/* ─────────────────────────────────────────
   POSTS
───────────────────────────────────────── */
.posts-list {
  display: grid;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.post-card {
  background: var(--bg);
  padding: 20px 22px;
  display: block;
  transition: background 0.15s;
}
.post-card:hover { background: var(--bg2); }
.post-date {
  font-family: var(--mono);
  font-size: 0.63rem;
  color: var(--dim);
  letter-spacing: 0.05em;
  margin-bottom: 5px;
}
.post-title {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text);
  line-height: 1.4;
  transition: color 0.15s;
}
.post-card:hover .post-title { color: var(--text); font-weight: 500; }
.post-excerpt {
  margin-top: 5px;
  font-size: 0.83rem;
  color: var(--muted);
}
.post-tags {
  margin-top: 10px;
  display: flex; gap: 5px; flex-wrap: wrap;
}
.tag {
  font-family: var(--mono);
  font-size: 0.59rem;
  color: var(--dim);
  border: 1px solid var(--border);
  padding: 2px 6px;
}
.all-posts {
  margin-top: 14px;
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.69rem;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  padding-bottom: 1px;
  transition: color 0.15s, border-color 0.15s;
}
.all-posts:hover { color: var(--text); border-color: var(--muted); }

/* ─────────────────────────────────────────
   BLOG LISTING HEADER
───────────────────────────────────────── */
.blog-header {
  padding: 80px 24px 48px;
  max-width: var(--col);
  margin: 0 auto;
}
.blog-header h1 {
  font-size: 1.6rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  margin-bottom: 8px;
}
.blog-header p { font-size: 0.87rem; color: var(--muted); }

/* ─────────────────────────────────────────
   POST PAGE
───────────────────────────────────────── */
.post-wrap {
  max-width: var(--col);
  margin: 0 auto;
  padding: 80px 24px 72px;
}
.post-meta {
  font-family: var(--mono);
  font-size: 0.65rem;
  color: var(--dim);
  letter-spacing: 0.05em;
  margin-bottom: 20px;
  display: flex; gap: 10px; flex-wrap: wrap;
}
.post-wrap > h1 {
  font-size: clamp(1.4rem, 2.8vw, 2rem);
  font-weight: 400;
  letter-spacing: -0.02em;
  line-height: 1.22;
  margin-bottom: 36px;
}
.post-body { font-size: 0.96rem; }
.post-body h2 { font-size: 1.15rem; font-weight: 400; margin: 36px 0 12px; }
.post-body h3 { font-size: 0.98rem; font-weight: 500; margin: 26px 0 10px; }
.post-body p { margin-bottom: 16px; color: var(--text); opacity: 0.82; }
.post-body ul, .post-body ol { margin: 0 0 16px 20px; }
.post-body li { margin-bottom: 5px; font-size: 0.91rem; opacity: 0.82; }
.post-body a { border-bottom: 1px solid var(--border); transition: border-color 0.15s; }
.post-body a:hover { border-color: var(--text); }
.post-body code {
  font-family: var(--mono); font-size: 0.82em;
  background: var(--bg2); border: 1px solid var(--border); padding: 1px 5px;
}
.post-body pre {
  background: var(--bg2); border: 1px solid var(--border);
  padding: 16px 20px; margin: 18px 0; overflow-x: auto;
}
.post-body pre code { background: none; border: none; padding: 0; font-size: 0.85em; }
.post-body blockquote {
  border-left: 2px solid var(--border);
  padding: 2px 0 2px 16px;
  margin: 18px 0; font-style: italic; color: var(--muted);
}
.post-nav {
  margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 0.68rem; color: var(--muted);
}
.post-nav a:hover { color: var(--text); }

/* ─────────────────────────────────────────
   FOOTER
───────────────────────────────────────── */
footer { border-top: 1px solid var(--border); }
.footer-inner {
  max-width: var(--col); margin: 0 auto; padding: 24px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 0.63rem; color: var(--dim);
}
footer a { transition: color 0.15s; }
footer a:hover { color: var(--muted); }

/* ─────────────────────────────────────────
   ANIMATION
───────────────────────────────────────── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.hero > * { opacity: 0; animation: fadeUp 0.4s ease forwards; }
.hero > *:nth-child(1) { animation-delay: 0.05s; }
.hero > *:nth-child(2) { animation-delay: 0.12s; }
.hero > *:nth-child(3) { animation-delay: 0.19s; }
.hero > *:nth-child(4) { animation-delay: 0.26s; }

/* ─────────────────────────────────────────
   RESPONSIVE
───────────────────────────────────────── */
@media (max-width: 600px) {
  .skills-grid { grid-template-columns: 1fr; }
  .footer-inner { flex-direction: column; gap: 6px; text-align: center; }
}