/* ============================================================
   Hannes Hapke — minimal mono/sans design
   ============================================================ */

:root {
  --bg:        #fafaf7;
  --bg-soft:   #f1f0eb;
  --fg:        #0e0e0e;
  --fg-soft:   #4a4a48;
  --fg-muted:  #7a7a76;
  --rule:      #d8d6cf;
  --rule-soft: #e9e7e0;
  --accent:    #1f7a3a;          /* terminal green */
  --accent-bg: rgba(31, 122, 58, 0.08);

  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --measure: 44rem;
  --gutter:  1.5rem;
  --radius:  4px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:        #0e0f0d;
    --bg-soft:   #181816;
    --fg:        #ececea;
    --fg-soft:   #c8c8c4;
    --fg-muted:  #8a8a85;
    --rule:      #2a2a27;
    --rule-soft: #1d1d1b;
    --accent:    #6ee7a1;
    --accent-bg: rgba(110, 231, 161, 0.1);
  }
}

* { box-sizing: border-box; }

html {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg-soft);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
  padding: 0;
}

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

a {
  color: var(--fg);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: color .15s, border-color .15s;
}
a:hover { color: var(--accent); border-color: var(--accent); }

h1, h2, h3, h4, h5, h6 {
  color: var(--fg);
  font-family: var(--font-sans);
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 2rem 0 .75rem;
  line-height: 1.25;
}
h1 { font-size: 1.85rem; letter-spacing: -0.02em; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.1rem; }

p { margin: 0 0 1.1rem; }

hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}

code, kbd, pre, samp {
  font-family: var(--font-mono);
  font-size: 0.92em;
}
code {
  background: var(--bg-soft);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
pre {
  background: var(--bg-soft);
  border: 1px solid var(--rule-soft);
  padding: 1rem 1.1rem;
  overflow-x: auto;
  border-radius: var(--radius);
  line-height: 1.5;
}
pre code { background: transparent; padding: 0; }

blockquote {
  margin: 1.25rem 0;
  padding: 0.25rem 0 0.25rem 1rem;
  border-left: 2px solid var(--rule);
  color: var(--fg-muted);
}

ul, ol { padding-left: 1.4rem; margin: 0 0 1.1rem; }
li { margin-bottom: 0.35rem; }

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}
th, td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--rule-soft);
  text-align: left;
}
th { color: var(--fg); font-weight: 600; }

figure { margin: 1.5rem 0; }
figcaption {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
  margin-top: 0.5rem;
}

::selection { background: var(--accent-bg); color: var(--fg); }

.skip {
  position: absolute; left: -9999px;
  background: var(--fg); color: var(--bg);
  padding: .5rem .75rem;
}
.skip:focus { left: 1rem; top: 1rem; z-index: 10; }

/* ----- layout ----- */

.wrap {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.site-header {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: saturate(180%) blur(8px);
}

.site-header__inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 1rem 0;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  gap: 1rem;
  flex-wrap: wrap;
}

.brand {
  color: var(--fg);
  font-weight: 600;
  border: none;
  letter-spacing: -0.01em;
}
.brand::before { content: "~/"; color: var(--accent); }

.nav { display: flex; gap: 1.25rem; }
.nav a {
  color: var(--fg-muted);
  border: none;
}
.nav a::before { content: "/"; color: var(--rule); margin-right: 0.05rem; }
.nav a:hover, .nav a.is-active { color: var(--accent); }
.nav a.is-active::before { color: var(--accent); }

@media (max-width: 36rem) {
  .site-header__inner {
    padding: 1.25rem 0 1rem;
    gap: 0.85rem;
  }
  .nav {
    width: 100%;
    flex-wrap: wrap;
    row-gap: 0.5rem;
    padding-top: 0.25rem;
  }
}

main { padding: 2.5rem 0 4rem; }

/* ----- home page ----- */

.lede {
  font-size: 1.15rem;
  color: var(--fg);
  max-width: 38rem;
  margin: 1rem 0 2.25rem;
  line-height: 1.55;
}
.lede strong { font-weight: 600; }

.section { margin: 2.75rem 0; }

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
}
.section__title {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-muted);
  font-weight: 500;
  margin: 0;
}
.section__title::before { content: "— "; color: var(--accent); }
.section__more {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
  border: none;
}
.section__more:hover { color: var(--accent); }

/* line item — date · title · meta */
.line-list { list-style: none; padding: 0; margin: 0; }
.line-list > li {
  display: grid;
  grid-template-columns: 6.5rem 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding: 0.55rem 0;
  border-bottom: 1px dashed var(--rule-soft);
  font-size: 0.95rem;
}
.line-list > li:last-child { border-bottom: 0; }
.line-list .meta-date,
.line-list .meta-tail {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
  white-space: nowrap;
}
.line-list .meta-tail { text-align: right; }
.line-list a {
  border: none;
  color: var(--fg);
}
.line-list a:hover { color: var(--accent); }

@media (max-width: 36rem) {
  .line-list > li {
    grid-template-columns: 1fr;
    gap: 0.15rem;
    padding: 0.65rem 0;
  }
  .line-list .meta-tail { text-align: left; }
}

/* book grid (4 books) */
.book-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem 1.5rem;
  margin: 1rem 0;
  list-style: none;
  padding: 0;
}
.book-grid li {
  border: 1px solid var(--rule-soft);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  background: var(--bg-soft);
}
.book-grid .book__year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.05em;
}
.book-grid .book__title {
  display: block;
  color: var(--fg);
  font-weight: 600;
  margin: 0.25rem 0 0.15rem;
  border: none;
}
.book-grid .book__title:hover { color: var(--accent); }
.book-grid .book__pub {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--fg-muted);
}
@media (max-width: 36rem) {
  .book-grid { grid-template-columns: 1fr; }
}

/* ----- project screenshots ----- */
.project-shot {
  display: block;
  width: 100%;
  height: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--bg-soft);
}
a:has(.project-shot) { border: none; }

/* ----- post / page ----- */

.page-head { margin-bottom: 2rem; }
.page-head h1 { margin: 0 0 0.5rem; font-size: 2rem; }
.page-head .meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
}
.page-head .meta a { color: var(--fg-muted); border: none; }
.page-head .meta a:hover { color: var(--accent); }
.page-head .meta .dot { margin: 0 0.5rem; color: var(--rule); }

.post-content,
.page-content {
  font-size: 1.02rem;
}
.post-content h1,
.post-content h2,
.post-content h3,
.page-content h1,
.page-content h2,
.page-content h3 { margin-top: 2.25rem; }
.post-content h1:first-child,
.page-content h1:first-child { margin-top: 0; }

.post-tags { margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--rule); }
.post-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--fg-muted);
  margin-right: 0.5rem;
  border: none;
}
.post-tag::before { content: "#"; color: var(--accent); }

.post-nav {
  margin-top: 3rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--rule);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}
.post-nav a { border: none; color: var(--fg-muted); }
.post-nav a:hover { color: var(--accent); }

/* ----- footer ----- */

.site-footer {
  border-top: 1px solid var(--rule);
  margin-top: 4rem;
  padding: 2rem 0 3rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--fg-muted);
}
.site-footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.site-footer a { color: var(--fg-muted); border: none; }
.site-footer a:hover { color: var(--accent); }
.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1rem;
}

/* ----- talks page (year groups) ----- */
.year-group { margin: 2rem 0; }
.year-group h2 {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--fg-muted);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.4rem;
  margin-bottom: 0.75rem;
}
.year-group h2::before { content: "— "; color: var(--accent); }

/* ----- code highlighting (rouge) tweaks ----- */
.highlight { background: var(--bg-soft); border-radius: var(--radius); }
.highlight pre { border: 1px solid var(--rule-soft); }