:root {
  --bg-primary: #0a0c10;
  --bg-secondary: #12151c;
  --bg-card: #1a1e2a;
  --bg-card-hover: #222838;
  --bg-input: #0e1018;
  --border-color: #2a2f42;
  --border-light: #353b52;
  --text-primary: #e8eaf0;
  --text-secondary: #9499b3;
  --text-muted: #6b7094;
  --accent: #7c8cf5;
  --accent-hover: #94a3f7;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);

  /* Badge colors */
  --level-weiss: #e0e0e0;
  --level-gelb: #f5d442;
  --level-orange: #e8a838;
  --level-gruen: #3ec78a;
  --level-blau: #6c7ee1;
  --level-schwarz: #888;
  --level-rot: #e05565;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 24px 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
}

h1 {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 2px;
}

.header-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s;
  white-space: nowrap;
}

.btn:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.btn-outline {
  background: transparent;
}

/* Search */
.search-input {
  display: block;
  width: calc(100% - 64px);
  max-width: 500px;
  margin: 16px 32px 8px;
  padding: 10px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.search-input:focus {
  border-color: var(--accent);
}

/* Level Legend */
.level-legend {
  display: flex;
  gap: 12px;
  padding: 12px 32px;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-secondary);
}

.level-legend .legend-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: default;
}

.level-legend .legend-dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.15);
  flex-shrink: 0;
}

/* Main */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 32px 60px;
}

.loading, .error {
  text-align: center;
  padding: 48px 16px;
  color: var(--text-muted);
  font-size: 1rem;
}

.error {
  color: var(--level-rot);
}

/* Category */
.category {
  margin-bottom: 32px;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  cursor: pointer;
  user-select: none;
  transition: all 0.2s;
}

.category-header:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.category-icon {
  font-size: 1.4rem;
}

.category-name {
  font-size: 1.15rem;
  font-weight: 600;
  flex: 1;
}

.category-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-primary);
  padding: 2px 10px;
  border-radius: 12px;
}

.category-toggle {
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: transform 0.2s;
}

.category.collapsed .category-toggle {
  transform: rotate(-90deg);
}

.category-topics {
  padding: 12px 0 0 16px;
  transition: max-height 0.3s ease;
  overflow: hidden;
}

.category.collapsed .category-topics {
  max-height: 0;
  padding-top: 0;
}

/* Topic */
.topic {
  margin-bottom: 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  overflow: hidden;
}

.topic-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}

.topic-header:hover {
  background: var(--bg-card);
}

.topic-name {
  font-size: 1rem;
  font-weight: 600;
  flex: 1;
}

.topic-levels-count {
  font-size: 0.75rem;
  color: var(--text-muted);
  background: var(--bg-primary);
  padding: 2px 8px;
  border-radius: 10px;
}

.topic-toggle {
  font-size: 0.8rem;
  color: var(--text-muted);
  transition: transform 0.2s;
}

.topic.collapsed .topic-toggle {
  transform: rotate(-90deg);
}

.topic-levels {
  border-top: 1px solid var(--border-color);
  transition: max-height 0.3s ease;
}

.topic.collapsed .topic-levels {
  max-height: 0;
  overflow: hidden;
}

/* Level */
.level {
  display: flex;
  gap: 14px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
  align-items: flex-start;
  transition: background 0.15s;
}

.level:last-child {
  border-bottom: none;
}

.level:hover {
  background: rgba(255,255,255,0.02);
}

.level-dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: 2px;
  border: 3px solid;
  box-shadow: 0 0 8px var(--dot-glow, rgba(0,0,0,0.3));
}

.level-info {
  flex: 1;
  min-width: 0;
}

.level-farbe {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.level-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.level-desc .bullet {
  display: block;
  padding-left: 8px;
  position: relative;
  margin-bottom: 2px;
}

.level-desc .bullet::before {
  content: "→";
  position: absolute;
  left: -4px;
  color: var(--text-muted);
}

.hidden {
  display: none !important;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  z-index: 1000;
  box-shadow: var(--shadow);
  max-width: 400px;
}

.toast.success {
  background: var(--level-gruen);
  color: #0a0c10;
}

.toast.error {
  background: var(--level-rot);
  color: #fff;
}

/* Responsive */
@media (max-width: 768px) {
  header {
    padding: 16px;
    flex-direction: column;
    align-items: flex-start;
  }

  .search-input {
    width: calc(100% - 32px);
    margin: 12px 16px 8px;
  }

  .level-legend {
    padding: 10px 16px;
    gap: 8px;
  }

  main {
    padding: 16px;
  }

  .category-topics {
    padding-left: 8px;
  }

  .level {
    padding: 10px 14px;
    gap: 10px;
  }

  .level-dot {
    width: 16px;
    height: 16px;
  }
}