/* ==========================================================================
   Ferdinand Popp — personal site
   Lab-terminal theme: dark, monospace accents, single cyan accent color.
   ========================================================================== */

:root {
  --bg: #0a0d10;
  --bg-alt: #12171c;
  --bg-alt-2: #171d23;
  --border: #232b32;
  --text: #d9e0e6;
  --text-muted: #859099;
  --text-faint: #5b656e;
  --accent: #3fd6c4;
  --accent-dim: #2a988c;
  --accent-soft: rgba(63, 214, 196, 0.1);
  --accent-2: #f2a65a;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --radius: 6px;
  --max-w: 780px;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* subtle dot-grid backdrop, evokes a sequencing plate / array without literal clip-art */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(var(--border) 1px, transparent 1px);
  background-size: 26px 26px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 100%);
}

a {
  color: var(--accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

h1, h2, h3 {
  font-family: var(--sans);
  font-weight: 700;
  line-height: 1.25;
  color: #f2f5f7;
}
h1 { font-size: 1.9rem; margin: 0 0 0.4em; }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.05rem; }

p { margin: 0 0 1em; }

code, pre {
  font-family: var(--mono);
  font-size: 0.88em;
}
pre {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1em;
  overflow-x: auto;
}

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

.site-nav {
  border-bottom: 1px solid var(--border);
  background: rgba(10, 13, 16, 0.85);
  backdrop-filter: saturate(140%) blur(6px);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.9rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.prompt {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--text);
  white-space: nowrap;
}
.prompt:hover { text-decoration: none; color: var(--accent); }
.prompt-user, .prompt-host { color: var(--accent); }
.prompt-at, .prompt-colon { color: var(--text-faint); }

.site-nav nav {
  display: flex;
  gap: 1.25rem;
  font-family: var(--mono);
  font-size: 0.88rem;
}
.site-nav nav a {
  color: var(--text-muted);
  padding: 0.2rem 0;
  border-bottom: 1px solid transparent;
}
.site-nav nav a:hover,
.site-nav nav a.active {
  color: var(--accent);
  text-decoration: none;
  border-bottom-color: var(--accent);
}

.site-main {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

.site-footer {
  border-top: 1px solid var(--border);
  margin-top: 3rem;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 1.75rem 1.25rem 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}
.social-links {
  list-style: none;
  display: flex;
  gap: 1.1rem;
  margin: 0;
  padding: 0;
}
.social-links a {
  color: var(--text-muted);
  font-size: 1.05rem;
}
.social-links a:hover { color: var(--accent); text-decoration: none; }
.footer-note {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-faint);
  margin: 0;
}
.footer-note a { color: var(--text-muted); }

/* ---- shared section styling ---- */

.section-label {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--accent-dim);
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
}
.section { margin-bottom: 3rem; }

/* ---- home / about ---- */

.hero .avatar {
  width: 84px;
  height: 84px;
  border-radius: 50%;
  border: 1px solid var(--border);
  object-fit: cover;
  margin-bottom: 1.2rem;
}
.hero h1 { margin-bottom: 0.25rem; }
.hero .tagline {
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.95rem;
  margin-bottom: 1.4rem;
}
.hero .affil {
  color: var(--text-muted);
  font-size: 0.95rem;
}
.hero .affil a { color: var(--text-muted); border-bottom: 1px dotted var(--text-faint); }
.hero .affil a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.news-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-alt);
  padding: 1rem 1.25rem;
}
.news-preview ul { list-style: none; margin: 0; padding: 0; }
.news-preview li {
  display: flex;
  gap: 0.8rem;
  padding: 0.4rem 0;
  font-size: 0.92rem;
}
.news-preview li + li { border-top: 1px dashed var(--border); }
.news-preview time {
  font-family: var(--mono);
  color: var(--text-faint);
  font-size: 0.8rem;
  white-space: nowrap;
  padding-top: 0.15rem;
}

/* ---- publications ---- */

.pub-list { list-style: none; margin: 0; padding: 0; }
.pub-item {
  padding: 1rem 0;
  border-bottom: 1px solid var(--border);
  position: relative;
  padding-left: 1.3rem;
}
.pub-item:before {
  content: ">";
  position: absolute;
  left: 0;
  top: 1.05rem;
  color: var(--accent);
  font-family: var(--mono);
}
.pub-item:last-child { border-bottom: none; }
.pub-title { font-weight: 600; color: #eef2f4; }
.pub-title a { color: inherit; }
.pub-title a:hover { color: var(--accent); text-decoration: none; }
.pub-meta {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-top: 0.2rem;
}
.pub-venue { color: var(--text); }
.pub-year { font-family: var(--mono); color: var(--text-faint); }
.author-self {
  text-decoration: underline;
  text-decoration-color: var(--accent-dim);
  text-underline-offset: 2px;
  color: var(--text);
}
.section-divider { margin-top: 2rem; }
.pub-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  background: var(--accent-soft);
  border-radius: 3px;
  padding: 0.05rem 0.4rem;
  margin-left: 0.5rem;
  vertical-align: middle;
}
.pub-links { margin-top: 0.35rem; font-family: var(--mono); font-size: 0.82rem; }
.pub-links a { margin-right: 0.9rem; }
.pub-note { font-size: 0.85rem; color: var(--text-faint); font-style: italic; margin-top: 0.2rem; }

/* ---- CV ---- */

.cv-header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.2rem;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 2rem;
}
.cv-entry { margin-bottom: 1.3rem; }
.cv-entry .cv-title { font-weight: 600; color: #eef2f4; }
.cv-entry .cv-place { color: var(--text-muted); font-size: 0.92rem; }
.cv-entry .cv-dates {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--text-faint);
  float: right;
}
.cv-entry ul { margin: 0.35rem 0 0 1.1rem; padding: 0; color: var(--text-muted); font-size: 0.92rem; }
.cv-entry li { margin-bottom: 0.2rem; }
.cv-earlier {
  font-size: 0.85rem;
  color: var(--text-faint);
  border-top: 1px dashed var(--border);
  padding-top: 0.8rem;
  margin-top: 0.5rem;
}
.skills-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.8rem 1.5rem;
}
.skill-row .skill-cat {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent-dim);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.skill-row .skill-items { color: var(--text-muted); font-size: 0.9rem; }
.cv-download {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  border-radius: var(--radius);
  padding: 0.4rem 0.8rem;
  margin-bottom: 1.5rem;
}
.cv-download:hover { background: var(--accent-soft); text-decoration: none; }

/* ---- news / posts ---- */

.news-list { list-style: none; margin: 0; padding: 0; }
.news-list li {
  display: flex;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}
.news-list time {
  font-family: var(--mono);
  color: var(--text-faint);
  font-size: 0.82rem;
  white-space: nowrap;
  padding-top: 0.15rem;
}
.post-content { margin-top: 1.5rem; }
.back-link { margin-top: 2rem; font-family: var(--mono); font-size: 0.85rem; }

/* ---- misc ---- */

.section-intro { color: var(--text-muted); margin-bottom: 1.5rem; }

@media (max-width: 560px) {
  h1 { font-size: 1.55rem; }
  .nav-inner { flex-direction: column; align-items: flex-start; gap: 0.6rem; }
  .site-nav nav { gap: 1rem; flex-wrap: wrap; }
  .cv-entry .cv-dates { float: none; display: block; }
  .skills-grid { grid-template-columns: 1fr; }
}