:root {
  --sdn-bg: #080b10;
  --sdn-bg-soft: #0d1219;
  --sdn-bg-elevated: #111821;
  --sdn-panel: #141c27;
  --sdn-panel-soft: #192331;
  --sdn-text: #f2f5f9;
  --sdn-text-muted: #a7b2c0;
  --sdn-border: #2b3746;
  --sdn-accent: #ff9d2f;
  --sdn-accent-2: #d43b33;
  --sdn-accent-soft: rgba(255, 157, 47, .14);
  --sdn-success: #65d695;
  --sdn-warning: #e9b34a;
  --sdn-danger: #ef6268;
  --sdn-info: #65a6ff;
  --sdn-shadow: 0 18px 48px rgba(0,0,0,.36);
  --sdn-radius: 16px;
  --sdn-radius-sm: 11px;
  --sdn-font: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  color-scheme: dark;
}

/*
 * Kompatibilitäts-Layer: vorhandene SDN-Module behalten ihr Layout,
 * ziehen ihre Farbvariablen aber aus demselben zentralen Theme.
 */
body.sdn-core-enabled {
  --bg: var(--sdn-bg);
  --bg-soft: var(--sdn-bg-soft);
  --card: var(--sdn-panel);
  --card-2: var(--sdn-panel-soft);
  --panel: var(--sdn-panel);
  --panel2: var(--sdn-panel-soft);
  --text: var(--sdn-text);
  --muted: var(--sdn-text-muted);
  --line: var(--sdn-border);
  --accent: var(--sdn-accent);
  --accent-2: var(--sdn-accent-2);
  --success: var(--sdn-success);
  --green: var(--sdn-success);
  --warning: var(--sdn-warning);
  --amber: var(--sdn-warning);
  --error: var(--sdn-danger);
  --danger: var(--sdn-danger);
  --red: var(--sdn-accent-2);
  --red2: #7f2422;
  --info: var(--sdn-info);
  --shadow: var(--sdn-shadow);
  color: var(--sdn-text);
  font-family: var(--sdn-font);
  accent-color: var(--sdn-accent);
}

body.sdn-core-enabled * {
  scrollbar-color: #3d4a5a var(--sdn-bg-soft);
}

body.sdn-core-enabled ::selection {
  background: rgba(255, 157, 47, .32);
  color: #fff;
}

.sdn-shell {
  color: var(--sdn-text);
  background: var(--sdn-bg);
  font-family: var(--sdn-font);
}

.sdn-panel {
  background: var(--sdn-panel);
  border: 1px solid var(--sdn-border);
  border-radius: var(--sdn-radius);
  box-shadow: var(--sdn-shadow);
}

.sdn-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: .7rem 1rem;
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--sdn-radius-sm);
  background: linear-gradient(135deg, var(--sdn-accent), var(--sdn-accent-2));
  color: #fff;
  font: inherit;
  font-weight: 800;
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 10px 24px rgba(0,0,0,.22);
}

.sdn-button:hover,
.sdn-button:focus-visible {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.sdn-muted { color: var(--sdn-text-muted); }
.sdn-danger { color: var(--sdn-danger); }
.sdn-success { color: var(--sdn-success); }

/* Einheitlicher, nicht-invasiver Schnellzugriff auf allen angebundenen Seiten. */
.sdn-hub {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 2147483000;
  font-family: var(--sdn-font);
  color: var(--sdn-text);
}

.sdn-hub-toggle {
  appearance: none;
  border: 1px solid rgba(255,255,255,.18);
  min-width: 54px;
  height: 54px;
  padding: 0 16px;
  border-radius: 18px;
  background: linear-gradient(135deg, #1a222e, #0d1219 62%);
  color: #fff;
  font: 900 13px/1 var(--sdn-font);
  letter-spacing: .11em;
  cursor: pointer;
  box-shadow: 0 16px 38px rgba(0,0,0,.48), inset 0 0 0 2px rgba(255,157,47,.08);
}

.sdn-hub-toggle::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--sdn-accent);
  box-shadow: 0 0 14px rgba(255,157,47,.8);
  vertical-align: 1px;
}

.sdn-hub-panel {
  position: absolute;
  right: 0;
  bottom: 64px;
  width: min(330px, calc(100vw - 28px));
  padding: 14px;
  border: 1px solid var(--sdn-border);
  border-radius: 18px;
  background: rgba(12, 17, 24, .97);
  box-shadow: 0 24px 68px rgba(0,0,0,.55);
  backdrop-filter: blur(18px);
}

.sdn-hub-panel[hidden] { display: none !important; }

.sdn-hub-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 3px 3px 11px;
  border-bottom: 1px solid var(--sdn-border);
}

.sdn-hub-head strong {
  color: #fff;
  font-size: 13px;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.sdn-hub-head span {
  color: var(--sdn-text-muted);
  font-size: 11px;
}

.sdn-hub-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding-top: 12px;
}

.sdn-hub-nav a,
.sdn-hub-links a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-height: 40px;
  padding: 9px 11px;
  border: 1px solid var(--sdn-border);
  border-radius: 11px;
  background: #121a24;
  color: var(--sdn-text);
  text-decoration: none;
  font: 700 12px/1.25 var(--sdn-font);
}

.sdn-hub-nav a:hover,
.sdn-hub-links a:hover {
  border-color: rgba(255,157,47,.52);
  background: #182231;
}

.sdn-hub-links {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.sdn-hub-links a { flex: 1; }

@media (max-width: 620px) {
  .sdn-hub { right: 12px; bottom: 12px; }
  .sdn-hub-toggle { height: 48px; min-width: 48px; padding: 0 13px; border-radius: 15px; }
  .sdn-hub-panel { bottom: 57px; }
}