:root {
  --bg-primary: #0c0b18;
  --bg-secondary: #131228;
  --bg-card: #1a1838;
  --accent-purple: #7855c0;
  --accent-purple-dim: rgba(120, 85, 192, 0.14);
  --accent-blue: #7895c0;
  --text-primary: #dce8f4;
  --text-secondary: #8fa4c0;
  --text-muted: #4d5a72;
  --border: rgba(120, 85, 192, 0.25);
  --header-height: 64px;
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(10, 10, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  height: 100%;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
}

.logo img {
  height: 48px;
  width: auto;
}

.site-nav { display: flex; gap: 4px; }

.site-nav a {
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 15px;
  font-weight: 500;
  transition: all 0.2s;
}

.site-nav a:hover {
  color: var(--text-primary);
  background: var(--accent-purple-dim);
}

.site-nav a.active {
  color: var(--accent-purple);
  background: var(--accent-purple-dim);
}

/* ── Dropdown ── */
.nav-dropdown {
  position: relative;
}

.nav-dropdown > a {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-dropdown > a::after {
  content: '▾';
  font-size: 11px;
  opacity: 0.6;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 160px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 6px;
  padding-top: 12px;
  list-style: none;
  z-index: 200;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.nav-dropdown:hover .dropdown-menu {
  display: block;
}

.dropdown-menu li a {
  display: block;
  padding: 8px 14px;
  border-radius: 7px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s;
}

.dropdown-menu li a:hover {
  color: var(--text-primary);
  background: var(--accent-purple-dim);
}

/* ── Layout ── */
.page {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 30px 0; }

.section-title {
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 8px;
}

.section-subtitle {
  color: var(--text-muted);
  margin-bottom: 40px;
  font-size: 16px;
}

/* ── Hero ── */
.hero {
  min-height: calc(40vh - var(--header-height));
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 80px 24px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 50% at 50% 40%, rgba(157, 78, 221, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.hero-tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--accent-purple-dim);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 12px;
  color: var(--accent-purple);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 24px;
}

.hero h1 {
  font-size: clamp(48px, 10vw, 96px);
  font-weight: 800;
  line-height: 1.05;
  margin-bottom: 20px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-blue) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 18px;
  color: var(--text-secondary);
  max-width: 520px;
  margin-bottom: 40px;
}

/* ── Buttons ── */
.btn-group {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
}

.btn {
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-purple), #6d28d9);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(157, 78, 221, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--accent-purple-dim);
  border-color: var(--accent-purple);
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: var(--accent-purple);
  transform: translateY(-2px);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* ── Info Cards (Home) ── */
.info-card { display: flex; flex-direction: column; gap: 6px; }

.info-card .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-purple);
  font-weight: 600;
}

.info-card .value { font-size: 20px; font-weight: 700; }

.info-card .desc { font-size: 14px; color: var(--text-secondary); }

/* ── Video Cards (Knowledgebase) ── */
a.video-card { display: flex; flex-direction: column; gap: 12px; }

.video-thumbnail {
  width: 100%;
  aspect-ratio: 16/9;
  background: var(--bg-secondary);
  border-radius: 8px;
  overflow: hidden;
  position: relative;
}

.video-thumbnail img { width: 100%; height: 100%; object-fit: cover; }

.play-icon {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(0, 0, 0, 0.35);
  opacity: 0;
  transition: opacity 0.2s;
}

a.video-card:hover .play-icon { opacity: 1; }

.play-icon svg { width: 48px; height: 48px; fill: white; }

.video-meta .title {
  font-weight: 600;
  font-size: 15px;
  line-height: 1.4;
}

.video-meta .category-tag {
  display: inline-block;
  padding: 2px 10px;
  background: var(--accent-purple-dim);
  color: var(--accent-purple);
  border-radius: 12px;
  font-size: 12px;
  margin-top: 6px;
}

/* ── Knowledgebase Categories ── */
.kb-category { margin-bottom: 60px; }

.kb-category-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.kb-category-header h2 { font-size: 20px; font-weight: 700; }

.kb-count {
  font-size: 13px;
  color: var(--text-muted);
  background: var(--bg-card);
  padding: 2px 10px;
  border-radius: 12px;
}

/* ── Code / Syntax (Wissensartikel) ── */
code {
  font-family: Consolas, "SF Mono", monospace;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 13px;
  color: var(--accent-purple);
}

.syntax-block {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 12px 16px;
  font-family: Consolas, "SF Mono", monospace;
  font-size: 13px;
  color: var(--text-primary);
  overflow-x: auto;
  margin: 10px 0 4px;
}

.syntax-block code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

.feature-card .req {
  display: inline-block;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--accent-purple);
  background: var(--accent-purple-dim);
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 10px;
}

/* ── Resource Tags (Asset Quellen) ── */
.tag-list { display: flex; flex-wrap: wrap; gap: 10px; }

.tag {
  padding: 8px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 14px;
  color: var(--text-secondary);
}

.tag.tag-link:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
}

/* ── About Page ── */
.about-grid {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 40px;
  align-items: start;
}

.avatar-card { text-align: center; }

.avatar-placeholder {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-purple), #1a1a2e);
  border: 3px solid var(--accent-purple);
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 56px;
}

.avatar-card h2 { font-size: 18px; }
.avatar-card .role { color: var(--text-muted); font-size: 13px; margin-top: 4px; }

.social-links { display: flex; flex-direction: column; gap: 8px; margin-top: 20px; }

.social-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-size: 14px;
  transition: all 0.2s;
}

.social-link:hover {
  border-color: var(--accent-purple);
  color: var(--text-primary);
}

.about-content h2 {
  font-size: 20px;
  margin-top: 32px;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.about-content h2:first-child { margin-top: 0; }

.about-content p {
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 10px;
}

/* ── Side Navigation ── */
.sidenav {
  position: fixed;
  top: calc(var(--header-height) + 32px);
  right: 24px;
  width: 200px;
  max-height: calc(100vh - var(--header-height) - 64px);
  overflow-y: auto;
  display: none;
}

@media (min-width: 1480px) {
  .sidenav { display: block; }
}

.sidenav-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.sidenav ul {
  list-style: none;
  border-left: 2px solid var(--border);
}

.sidenav-link {
  display: block;
  padding: 5px 12px;
  font-size: 13px;
  color: var(--text-muted);
  border-left: 2px solid transparent;
  margin-left: -2px;
  transition: color 0.15s, border-color 0.15s;
  line-height: 1.4;
}

.sidenav-link.sidenav-sub {
  padding-left: 22px;
  font-size: 12px;
}

.sidenav-link:hover {
  color: var(--text-secondary);
}

.sidenav-link.sidenav-active {
  color: var(--accent-purple);
  border-left-color: var(--accent-purple);
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
  margin-top: 40px;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
}

@media (max-width: 540px) {
  .header-inner, .page { padding: 0 16px; }
  .site-nav a { padding: 8px 10px; font-size: 14px; }
  .hero p { font-size: 16px; }
}