* { box-sizing: border-box; }
  html, body {
    margin: 0; padding: 0;
    width: 100%; height: 100%;
    background: #020610;
    overflow: hidden;
    font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
    overscroll-behavior: none;
  }

  /* ============================================================
     STAGE & SLIDES
     ============================================================ */
  .stage {
    position: fixed;
    inset: 0;
    overflow: hidden;
    background: radial-gradient(circle at 50% 40%, #061223 0%, #020610 70%);
  }
  .slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    visibility: hidden;
    transform: translateX(6%) scale(0.995);
    transition:
      opacity 0.75s cubic-bezier(.22, 1, .36, 1),
      transform 0.75s cubic-bezier(.22, 1, .36, 1),
      visibility 0s linear 0.75s;
    will-change: transform, opacity;
    z-index: 1;
  }
  .slide.active {
    opacity: 1;
    visibility: visible;
    transform: translateX(0) scale(1);
    transition-delay: 0s, 0s, 0s;
    z-index: 2;
  }
  .slide.exit-left {
    opacity: 0;
    visibility: visible;
    transform: translateX(-6%) scale(0.995);
    transition-delay: 0s, 0s, 0s;
    z-index: 1;
  }
  .slide.exit-right {
    opacity: 0;
    visibility: visible;
    transform: translateX(6%) scale(0.995);
    transition-delay: 0s, 0s, 0s;
    z-index: 1;
  }
  .slide iframe {
    display: block;
    width: 100%;
    height: 100%;
    border: 0;
    background: #020610;
  }

  /* ============================================================
     NAVIGATION - PFEILE
     ============================================================ */
  .nav {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 50;
    width: 56px; height: 56px;
    border-radius: 50%;
    border: 1px solid rgba(160, 225, 255, 0.30);
    background: linear-gradient(150deg,
      rgba(255, 255, 255, 0.13) 0%,
      rgba(0, 170, 255, 0.07) 100%);
    backdrop-filter: blur(16px) saturate(160%);
    -webkit-backdrop-filter: blur(16px) saturate(160%);
    color: #dff2ff;
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    cursor: pointer;
    display: grid;
    place-items: center;
    transition:
      transform .3s cubic-bezier(.22, 1, .36, 1),
      border-color .3s ease,
      background .3s ease,
      box-shadow .3s ease,
      opacity .3s ease;
    box-shadow:
      0 12px 34px rgba(0, 0, 0, .5),
      inset 0 1px 0 rgba(255, 255, 255, .22);
    padding-bottom: 3px;
  }
  .nav:hover {
    border-color: rgba(0, 230, 255, 0.75);
    background: linear-gradient(150deg,
      rgba(0, 230, 255, 0.20) 0%,
      rgba(255, 0, 255, 0.12) 100%);
    box-shadow:
      0 12px 34px rgba(0, 0, 0, .5),
      0 0 30px rgba(0, 220, 255, 0.5),
      inset 0 1px 0 rgba(255, 255, 255, .3);
  }
  .nav:active { transform: translateY(-50%) scale(0.94); }
  .nav.prev { left: 22px; }
  .nav.next { right: 22px; }
  .nav:disabled {
    opacity: 0.25;
    cursor: not-allowed;
    pointer-events: none;
  }

  /* ============================================================
     DOTS
     ============================================================ */
  .dots {
    position: fixed;
    left: 50%;
    bottom: 22px;
    transform: translateX(-50%);
    display: flex;
    gap: 12px;
    z-index: 50;
    padding: 10px 16px;
    border-radius: 999px;
    background: rgba(2, 10, 24, 0.5);
    backdrop-filter: blur(14px) saturate(160%);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    border: 1px solid rgba(160, 225, 255, 0.18);
    box-shadow: 0 12px 30px rgba(0, 0, 0, .5);
  }
  .dot {
    width: 10px; height: 10px;
    padding: 0;
    border: none;
    border-radius: 50%;
    background: rgba(160, 210, 255, 0.28);
    cursor: pointer;
    transition: background .3s ease, box-shadow .3s ease, transform .3s ease;
  }
  .dot:hover {
    background: rgba(160, 210, 255, 0.55);
    transform: scale(1.15);
  }
  .dot.active {
    background: linear-gradient(135deg, #00ffff, #ff00ff);
    box-shadow: 0 0 14px rgba(0, 220, 255, 0.85);
    transform: scale(1.25);
  }

  /* ============================================================
     SECTION-LABEL (oben Mitte)
     ============================================================ */
  .section-label {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    padding: 8px 22px;
    border-radius: 999px;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.26em;
    text-transform: uppercase;
    color: rgba(200, 235, 255, 0.85);
    background: rgba(2, 10, 24, 0.5);
    backdrop-filter: blur(14px) saturate(160%);
    -webkit-backdrop-filter: blur(14px) saturate(160%);
    border: 1px solid rgba(160, 225, 255, 0.20);
    box-shadow: 0 10px 26px rgba(0, 0, 0, .45);
    pointer-events: none;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 12px;
  }
  .section-label .num {
    font-family: ui-monospace, monospace;
    font-weight: 800;
    background: linear-gradient(90deg, #00ffff, #ff00ff);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  .section-label .txt {
    background: linear-gradient(90deg, #eaf6ff, #9fe8ff);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  /* ============================================================
     PROGRESS BAR
     ============================================================ */
  .progress {
    position: fixed;
    top: 0; left: 0;
    height: 2px;
    width: 0%;
    background: linear-gradient(90deg, #00ffff, #ff00ff);
    box-shadow: 0 0 12px rgba(0, 220, 255, 0.75);
    z-index: 60;
    transition: width 0.75s cubic-bezier(.22, 1, .36, 1);
  }

  /* ============================================================
     LOADING OVERLAY
     ============================================================ */
  .loader {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    z-index: 45;
    background: radial-gradient(circle at 50% 50%, #061223 0%, #020610 62%);
    opacity: 0;
    visibility: hidden;
    transition: opacity .4s ease, visibility 0s linear .4s;
    pointer-events: none;
  }
  .loader.show {
    opacity: 1;
    visibility: visible;
    transition-delay: 0s;
  }
  .loader::after {
    content: '';
    width: 44px; height: 44px;
    border-radius: 50%;
    border: 3px solid rgba(0, 220, 255, 0.18);
    border-top-color: #00ffff;
    box-shadow: 0 0 20px rgba(0, 220, 255, 0.5);
    animation: spin 0.85s linear infinite;
  }
  @keyframes spin { to { transform: rotate(360deg); } }

  /* ============================================================
     RESPONSIVE
     ============================================================ */
  @media (max-width: 700px) {
    .nav { width: 44px; height: 44px; font-size: 1.2rem; }
    .nav.prev { left: 12px; }
    .nav.next { right: 12px; }
    .section-label {
      font-size: 0.55rem;
      padding: 6px 14px;
      letter-spacing: 0.2em;
    }
    /* Punkte ausgeblendet: auf Mobile ueberlappen sie sonst die nach unten
       verschobenen Seiteninhalte. Position ueber Section-Label + Pfeile. */
    .dots { display: none; }
  }