/* ==========================================================================
   Marco Albarelli — personal site
   Plain CSS, no build step. Light/dark follows the OS preference.
   ========================================================================== */

:root {
  --bg: #fbfbfa;
  --bg-alt: #f1f2f0;
  --fg: #1d2021;
  --muted: #5d6366;
  --accent: #0b6e69;
  --accent-soft: #d9efed;
  --border: #e0e2df;
  --radius: 10px;
  --max: 46rem;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141718;
    --bg-alt: #1c2021;
    --fg: #e6e8e7;
    --muted: #9aa1a3;
    --accent: #4fc1b8;
    --accent-soft: #17393a;
    --border: #2a2f30;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.65;
}

a { color: var(--accent); text-underline-offset: 0.18em; }
a:hover { text-decoration-thickness: 2px; }

img { max-width: 100%; height: auto; }

.container {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.skip-link {
  position: absolute;
  left: -999px;
}
.skip-link:focus {
  left: 1rem;
  top: 1rem;
  background: var(--accent);
  color: var(--bg);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
}

/* ---------- Header / nav ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 3.5rem;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  color: var(--fg);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.nav { display: flex; gap: 1.1rem; flex-wrap: wrap; }
.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.95rem;
}
.nav a:hover, .nav a[aria-current="page"] { color: var(--fg); }

/* ---------- Hero ---------- */

.hero { padding: 4.5rem 0 3rem; }

.hero .eyebrow {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.hero h1 {
  font-size: clamp(2.1rem, 6vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 1rem;
}

.hero .lead {
  font-size: 1.2rem;
  color: var(--muted);
  margin: 0 0 1.75rem;
}

.btn-row { display: flex; gap: 0.75rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.btn-primary { background: var(--accent); color: var(--bg); }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { color: var(--accent); }
.btn-ghost:hover { background: var(--accent-soft); }

/* ---------- Sections ---------- */

section { padding: 2.5rem 0; }
section + section { border-top: 1px solid var(--border); }

h2 {
  font-size: 1.5rem;
  letter-spacing: -0.015em;
  margin: 0 0 1.25rem;
}

h3 { font-size: 1.1rem; margin: 0 0 0.25rem; }

.muted { color: var(--muted); }

/* Skills */

.skills {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr));
  gap: 1rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.skill-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
}
.skill-card h3 { font-size: 1rem; margin-bottom: 0.5rem; }

.tags { display: flex; flex-wrap: wrap; gap: 0.35rem; padding: 0; margin: 0; list-style: none; }
.tags li {
  font-size: 0.8rem;
  padding: 0.15rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--fg);
}

/* Experience timeline */

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline > li {
  position: relative;
  padding: 0 0 2rem 1.5rem;
  border-left: 2px solid var(--border);
}
.timeline > li:last-child { padding-bottom: 0; }
.timeline > li::before {
  content: "";
  position: absolute;
  left: -7px;
  top: 0.45rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
}
.timeline .when {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
}
.timeline ul { margin: 0.5rem 0 0; padding-left: 1.1rem; }
.timeline ul li { margin-bottom: 0.3rem; }
.timeline ul.compact { list-style: none; padding-left: 0; }
.timeline ul.compact li { margin-bottom: 0.55rem; line-height: 1.5; }

/* Post lists */

.post-list { list-style: none; padding: 0; margin: 0; }
.post-list li {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
}
.post-list li:first-child { padding-top: 0; }
.post-list a.title {
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
  color: var(--fg);
}
.post-list a.title:hover { color: var(--accent); }
.post-list time, .post-meta {
  display: block;
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--muted);
}
.post-list p { margin: 0.3rem 0 0; color: var(--muted); }

/* ---------- Article ---------- */

article.post { padding: 3rem 0; }
article.post header { margin-bottom: 2rem; }
article.post h1 {
  font-size: clamp(1.8rem, 5vw, 2.4rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0.4rem 0 0.5rem;
}
article.post h2 { margin-top: 2.25rem; }

article.post blockquote {
  margin: 1.5rem 0;
  padding: 0.25rem 1.25rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0.1em 0.35em;
}

pre {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  line-height: 1.5;
}
pre code { background: none; border: 0; padding: 0; font-size: 0.88rem; }

.back { display: inline-block; margin-top: 2.5rem; }

/* Archived posts from the old blog */
.archive-note {
  font-size: 0.9rem;
  color: var(--muted);
  background: var(--bg-alt);
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  padding: 0.6rem 0.9rem;
  margin: 0 0 2rem;
}
.lang-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.05rem 0.4rem;
  margin-left: 0.4rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  vertical-align: middle;
}
article.post header .tags { margin-top: 0.75rem; }
article.archived img { border-radius: 6px; }
article.archived table { border-collapse: collapse; display: block; overflow-x: auto; }
article.archived td, article.archived th { border: 1px solid var(--border); padding: 0.3rem 0.6rem; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 2rem;
  font-size: 0.9rem;
  color: var(--muted);
}
.site-footer .container {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-footer a { color: var(--muted); }
.site-footer nav { display: flex; gap: 1rem; }

/* ---------- Print (doubles as a quick CV printout) ---------- */

@media print {
  .site-header, .site-footer, .btn-row, #writing { display: none; }
  body { background: #fff; color: #000; font-size: 11pt; }
  section { padding: 1rem 0; }
  a { color: #000; }
}

/* Archive index: static pages list */
#pages h3 { margin: 1.5rem 0 0.5rem; color: var(--muted); font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.04em; }
.post-list.compact-list li { padding: 0.45rem 0; }
.post-list.compact-list a.title { font-size: 1rem; }