:root {
  --bg: #0d1117;
  --panel: #161b22;
  --border: #30363d;
  --fg: #c9d1d9;
  --dim: #8b949e;
  --green: #3fb950;
  --cyan: #58a6ff;
  --orange: #d29922;
  --red: #f85149;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 4rem; }

body {
  margin: 0;
  background: var(--bg) url(bg.svg) fixed;
  color: var(--fg);
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1.6;
}

/* language toggle: html[lang] decides which .de/.en elements show */
html[lang="de"] .en { display: none !important; }
html[lang="en"] .de { display: none !important; }

a { color: var(--cyan); text-decoration: none; }
a:hover { text-decoration: underline; }

nav {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 1rem;
  padding: 0.6rem 1rem;
  background: rgba(13,17,23,0.95);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}
nav .brand { color: var(--green); font-weight: bold; }
nav .navlinks { display: flex; gap: 1rem; flex-wrap: wrap; }
nav .navlinks a { color: var(--fg); }
nav .navlinks a:hover { color: var(--green); text-decoration: none; }
#langbtn {
  margin-left: auto;
  background: var(--panel); color: var(--orange);
  border: 1px solid var(--border); border-radius: 6px;
  font-family: var(--mono); font-size: 0.9em;
  padding: 0.2rem 0.6rem; cursor: pointer;
}
#langbtn:hover { border-color: var(--orange); }

.blink { animation: blink 1.2s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }

main, header.term, footer { max-width: 900px; margin: 0 auto; padding: 0 1rem; }

/* terminal window */
.term { margin-top: 2rem; }
.termbar {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px 8px 0 0;
  padding: 0.5rem 0.8rem;
  display: flex; align-items: center; gap: 0.4rem;
  color: var(--dim); font-size: 0.85em;
}
.termbar i { width: 12px; height: 12px; border-radius: 50%; background: var(--red); }
.termbar i:nth-child(2) { background: var(--orange); }
.termbar i:nth-child(3) { background: var(--green); }
.termbar span { margin-left: 0.5rem; }
.termbody {
  background: #010409;
  border: 1px solid var(--border); border-top: 0;
  border-radius: 0 0 8px 8px;
  padding: 1rem;
  overflow-x: auto;
}
.termbody pre { margin: 0 0 0.5rem; }

pre {
  background: #010409;
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.8rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.9em;
}
.termbody pre { border: 0; padding: 0; }

.p { color: var(--green); font-weight: bold; }
.ok { color: var(--green); }

/* syntax colors */
.kw { color: #ff7b72; }
.ty { color: #79c0ff; }
.st { color: #a5d6ff; }
.nu { color: #d2a8ff; }
.cm { color: var(--dim); font-style: italic; }

section { margin: 3.5rem 0; }
h2 {
  font-size: 1.15em;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
}
h3 { color: var(--orange); font-size: 1em; margin: 2rem 0 0.6rem; }

.cols { display: flex; gap: 2rem; align-items: flex-start; }
.cols figure {
  margin: 0; flex-shrink: 0;
  display: flex; flex-direction: column; gap: 0.8rem;
  font-size: 0.8em; color: var(--dim);
}
.cols img, .videos video {
  border: 1px solid var(--border); border-radius: 6px;
  max-width: 100%; height: auto; display: block;
}
.cols figcaption { max-width: 200px; }

/* cv rows */
.tbl div {
  display: grid;
  grid-template-columns: 12rem 1fr;
  gap: 0.3rem 1.5rem;
  padding: 0.45rem 0;
  border-bottom: 1px dashed var(--border);
}
.tbl b { color: var(--fg); font-weight: 600; }

/* videos */
.videos {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}
.videos figure { margin: 0; }
.videos video { width: 100%; aspect-ratio: 16/9; background: #010409; }
.videos figcaption { color: var(--dim); font-size: 0.85em; margin-top: 0.4rem; }

.btn {
  display: inline-block;
  background: var(--panel);
  border: 1px solid var(--green);
  border-radius: 6px;
  color: var(--green);
  padding: 0.4rem 1rem;
}
.btn:hover { background: var(--green); color: #010409; text-decoration: none; }

footer {
  border-top: 1px solid var(--border);
  margin-top: 4rem; padding: 2rem 1rem 3rem;
  text-align: center; color: var(--dim); font-size: 0.85em;
}
footer img { opacity: 0.6; }
footer .links a { color: var(--dim); }

@media (max-width: 640px) {
  body { font-size: 14px; }
  html { scroll-padding-top: 6.5rem; }
  nav { gap: 0.4rem 1rem; }
  nav .navlinks { order: 3; width: 100%; }
  .cols { flex-direction: column; }
  .cols figure { flex-direction: row; align-items: flex-start; }
  .cols figure img:first-child { display: none; }
  .tbl div { grid-template-columns: 1fr; gap: 0; }
  .tbl b { color: var(--orange); }
}