/* =========================================================
   nightride32x - Theme: alien
   Sehr dunkler Hintergrund, phosphorgrüne Akzente,
   angelehnt an die Terminal-/HUD-Ästhetik der Alien-Filme.
   ========================================================= */

:root {
  --bg: #06090a;
  --bg-elevated: #0b1210;
  --bg-elevated-2: #0f1a16;
  --border: #1c2e28;
  --text: #c9d6d1;
  --text-dim: #7c9089;
  --green: #39ff6e;
  --green-dim: #1f8f4a;
  --green-glow: rgba(57, 255, 110, 0.35);
  --danger: #ff4d4d;
  --font-mono: "Courier New", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  background:
    radial-gradient(ellipse at top, #0a1210 0%, #05080a 60%, #030404 100%);
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-sans);
  line-height: 1.6;
  min-height: 100vh;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      rgba(57, 255, 110, 0.02) 0px,
      rgba(57, 255, 110, 0.02) 1px,
      transparent 1px,
      transparent 3px
    );
  opacity: 0.5;
}

a {
  color: var(--green);
  text-decoration: none;
  transition: text-shadow 0.15s ease, color 0.15s ease;
}

a:hover,
a:focus {
  color: #8dffb0;
  text-shadow: 0 0 6px var(--green-glow), 0 0 14px var(--green-glow);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--green);
  font-family: var(--font-mono);
  letter-spacing: 0.03em;
  text-shadow: 0 0 8px var(--green-glow);
  margin-top: 1.6em;
  margin-bottom: 0.6em;
}

h1 { font-size: 1.9rem; border-bottom: 1px solid var(--border); padding-bottom: 0.4em; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; color: #8dffb0; text-shadow: none; }

header {
  position: relative;
  z-index: 1;
  background: linear-gradient(180deg, #081210 0%, #05080a 100%);
  border-bottom: 1px solid var(--green-dim);
  box-shadow: 0 1px 24px -6px var(--green-glow);
  padding: 1.2rem 1.5rem 0;
}

.banner {
  display: block;
  max-width: 480px;
  margin: 0 auto 1rem;
}

.banner-fallback {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 2rem;
  letter-spacing: 0.15em;
  color: var(--green);
  text-shadow: 0 0 10px var(--green-glow), 0 0 24px var(--green-glow);
  margin: 0.4em 0 0.8em;
}

pre.banner {
  color: var(--green);
  text-shadow: 0 0 8px var(--green-glow);
  font-family: var(--font-mono);
  font-size: clamp(0.28rem, 1.3vw, 0.75rem);
  line-height: 1.15;
  text-align: center;
  white-space: pre;
  overflow-x: hidden;
  width: 100%;
  max-width: 1800px;
  margin: 0.5em auto 1em;
  padding: 0 1rem;
}

.main-nav {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border);
}

.main-nav li {
  margin: 0;
}

.main-nav a {
  display: block;
  padding: 0.9rem 1.1rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  color: var(--text-dim);
  border-bottom: 2px solid transparent;
}

.main-nav a:hover {
  color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
}

.main-nav li.active a {
  color: var(--green);
  border-bottom-color: var(--green);
  text-shadow: 0 0 6px var(--green-glow);
}

.layout {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: 2rem;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.content {
  flex: 1 1 auto;
  min-width: 0;
  order: 1;
}

.side-nav {
  order: 2;
  flex: 0 0 260px;
  position: sticky;
  top: 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1rem 1.2rem;
}

.side-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.side-nav li {
  margin: 0.15rem 0;
}

.side-nav > ul > li {
  margin-bottom: 0.5rem;
}

.side-nav a {
  display: block;
  padding: 0.35rem 0.5rem;
  border-radius: 3px;
  font-size: 0.92rem;
}

.side-nav a:hover {
  background: rgba(57, 255, 110, 0.08);
}

.side-nav li.current > a {
  color: #8dffb0;
  background: rgba(57, 255, 110, 0.12);
  box-shadow: inset 2px 0 0 var(--green);
}

.side-nav details > summary {
  cursor: pointer;
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--green-dim);
  padding: 0.35rem 0.5rem;
  list-style: none;
}

.side-nav details > summary::-webkit-details-marker {
  display: none;
}

.side-nav details > summary::before {
  content: "▸ ";
  color: var(--green);
}

.side-nav details[open] > summary::before {
  content: "▾ ";
}

.side-nav details ul {
  margin-left: 0.6rem;
  border-left: 1px solid var(--border);
  padding-left: 0.6rem;
}

.root-content .intro {
  text-align: center;
  font-family: var(--font-mono);
  color: var(--text-dim);
  margin-bottom: 2rem;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1.2rem;
}

.category-card {
  display: block;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.2rem 1.3rem;
  color: var(--text);
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.category-card:hover {
  border-color: var(--green);
  box-shadow: 0 0 18px -4px var(--green-glow);
  transform: translateY(-2px);
  text-shadow: none;
}

.category-card h2 {
  margin: 0 0 0.4rem;
  font-size: 1.1rem;
}

.category-card p {
  margin: 0;
  color: var(--text-dim);
  font-size: 0.9rem;
}

.content p {
  margin: 0.8em 0;
}

.content ul, .content ol {
  padding-left: 1.4em;
}

.content blockquote {
  border-left: 3px solid var(--green-dim);
  margin: 1em 0;
  padding: 0.4em 1em;
  color: var(--text-dim);
  background: rgba(57, 255, 110, 0.04);
}

.content code {
  font-family: var(--font-mono);
  background: var(--bg-elevated-2);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  color: #8dffb0;
  font-size: 0.9em;
}

.content pre {
  background: var(--bg-elevated-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1em;
  overflow-x: auto;
}

.content pre code {
  background: none;
  padding: 0;
}

.content table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
}

.content th, .content td {
  border: 1px solid var(--border);
  padding: 0.5em 0.8em;
  text-align: left;
}

.content th {
  background: var(--bg-elevated-2);
  color: var(--green);
  font-family: var(--font-mono);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
}

.content img {
  display: block;
  width: 100%;
  max-width: 480px;
  height: auto;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.popup-image {
  display: block;
  width: 220px;
  max-width: 100%;
  height: auto;
  cursor: zoom-in;
  transition: box-shadow 0.15s ease;
}

.popup-image:hover {
  box-shadow: 0 0 14px -2px var(--green-glow);
}

.popup-figure {
  display: inline-block;
  width: 220px;
  margin: 0.5em 0.8em 0.5em 0;
  text-align: center;
  vertical-align: top;
}

.popup-figure figcaption {
  margin-top: 0.4em;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
  width: 220px;
}

.popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(3, 5, 4, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 999;
  cursor: zoom-out;
  padding: 2rem;
}

.popup-overlay img {
  max-width: 100%;
  max-height: 100%;
  box-shadow: 0 0 40px var(--green-glow);
  border: 1px solid var(--green-dim);
  border-radius: 4px;
}

footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  display: flex;
  gap: 1.2rem;
  justify-content: center;
  flex-wrap: wrap;
}

footer a {
  color: var(--text-dim);
}

footer a:hover {
  color: var(--green);
}

@media (max-width: 800px) {
  .layout {
    flex-direction: column;
  }

  .side-nav {
    order: 0;
    width: 100%;
    position: static;
  }
}