* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #000;
  color: #fff;
  font-family: Arial, Helvetica, sans-serif;
}

/* Header */

.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 32px;
  background: #000;
  border-bottom: 1px solid #222;
}

.logo {
  color: #fff;
  text-decoration: none;
  letter-spacing: 0.3em;
  font-weight: 600;
  font-size: 14px;
}

.nav a {
  color: #ccc;
  text-decoration: none;
  margin-left: 18px;
  font-size: 14px;
}

.nav a:hover {
  color: #fff;
}

/* Bühne */

.stage-wrapper {
  position: relative;
  min-height: 100vh;
  background: #000;
  overflow: hidden;
}

/* Vorhänge */

.curtain {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 18%;
  background: repeating-linear-gradient(
    90deg,
    #4a0000,
    #7b0000 12px,
    #4a0000 24px
  );
  animation: curtainMove 16s ease-in-out infinite;
}

.curtain-left {
  left: 0;
}

.curtain-right {
  right: 0;
  animation-delay: -8s;
}

/* Bühne Mitte */

.stage {
  position: relative;
  margin: 0 auto;
  width: 64%;
  min-height: 100vh;
  background: #050505;
  padding: 80px 60px;
  animation: stageBreath 20s ease-in-out infinite;
}

/* Lichtkegel */

.spotlight {
  position: absolute;
  top: -240px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle at top, rgba(255,255,255,0.22), rgba(0,0,0,0));
  pointer-events: none;
  animation: lightMove 14s ease-in-out infinite;
}

/* Inhalt */

.content {
  position: relative;
  z-index: 2;
}

h1 {
  font-size: 34px;
  font-weight: normal;
  margin-bottom: 40px;
}

.box {
  max-width: 760px;
  margin-bottom: 36px;
  padding: 26px;
  background: rgba(255,255,255,0.03);
  border-left: 2px solid #666;
}

.box h2 {
  margin-top: 0;
  font-size: 20px;
  font-weight: normal;
}

.box p {
  line-height: 1.75;
  color: #ddd;
}

/* Footer */

.footer {
  padding: 32px;
  background: #000;
  border-top: 1px solid #222;
  font-size: 14px;
  color: #aaa;
}

.footer a {
  color: #aaa;
  text-decoration: none;
}

.footer a:hover {
  color: #fff;
}

/* Animationen */

@keyframes curtainMove {
  0% { background-position: 0 0; }
  50% { background-position: 24px 0; }
  100% { background-position: 0 0; }
}

@keyframes stageBreath {
  0% { background-color: #050505; }
  50% { background-color: #020202; }
  100% { background-color: #050505; }
}

@keyframes lightMove {
  0% { opacity: 0.18; }
  50% { opacity: 0.28; }
  100% { opacity: 0.18; }
}

/* Responsive */

@media (max-width: 900px) {
  .curtain {
    display: none;
  }

  .stage {
    width: 100%;
    padding: 60px 24px;
  }
}