html, body { min-height: 100%; padding: 0; margin: 0; }
body { overflow-x: hidden; overflow-y: auto; }
#unity-container { position: relative; width: 100%; height: 100vh; min-height: 100vh; }
#unity-canvas { display: block; width: 100%; height: 100%; background: #CCCCCC }
#unity-loading-bar { position: absolute; left: 50%; top: 50%; transform: translate(-50%, -50%); display: none }
#unity-logo { width: 154px; height: 130px; background: url('unity-logo-light.png') no-repeat center }
#unity-progress-bar-empty { margin-left: auto; margin-right: auto; width: 141px; height: 18px; margin-top: 10px; background: url('progress-bar-empty-light.png') no-repeat center }
#unity-progress-bar-full { width: 0%; height: 18px; margin-top: 10px; background: url('progress-bar-full-light.png') no-repeat center }
#unity-warning { position: absolute; left: 50%; top: 5%; transform: translate(-50%); background: white; padding: 10px; display: none }

#chainsim-course-launch-overlay {
  position: fixed;
  inset: 0;
  z-index: 2147483000;
  display: none;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  padding: 24px;
  color: #10132d;
  background:
    radial-gradient(circle at 10% 14%, rgba(40, 197, 189, .18), transparent 34%),
    radial-gradient(circle at 89% 84%, rgba(66, 62, 222, .18), transparent 35%),
    #f5f7ff;
  font-family: Arial, Helvetica, sans-serif;
  opacity: 1;
  transition: opacity 180ms ease;
}

.chainsim-student-course-launch #chainsim-course-launch-overlay {
  display: flex;
}

#chainsim-course-launch-overlay.is-leaving {
  opacity: 0;
  pointer-events: none;
}

.chainsim-course-launch-card {
  width: min(520px, calc(100vw - 48px));
  box-sizing: border-box;
  padding: 44px 46px 40px;
  text-align: center;
  border: 1px solid rgba(53, 58, 211, .13);
  border-radius: 28px;
  background: rgba(255, 255, 255, .96);
  box-shadow: 0 26px 70px rgba(21, 26, 84, .14);
}

.chainsim-course-launch-mark {
  position: relative;
  width: 66px;
  height: 66px;
  margin: 0 auto 24px;
  border-radius: 20px;
  background: linear-gradient(145deg, #12b9ad, #3f43dd);
  box-shadow: 0 14px 28px rgba(47, 67, 200, .24);
}

.chainsim-course-launch-mark::before,
.chainsim-course-launch-mark::after,
.chainsim-course-launch-mark span {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 23px;
  height: 23px;
  box-sizing: border-box;
  border: 3px solid #fff;
  transform: translate(-50%, -50%) rotate(45deg);
}

.chainsim-course-launch-mark::after {
  width: 7px;
  height: 7px;
  border: 0;
  border-radius: 50%;
  background: #fff;
}

.chainsim-course-launch-mark span {
  width: 35px;
  height: 35px;
  border-width: 1px;
  opacity: .42;
}

.chainsim-course-launch-kicker {
  margin: 0 0 9px;
  color: #363bd3;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .13em;
  text-transform: uppercase;
}

#chainsim-course-launch-title {
  margin: 0;
  font-size: clamp(28px, 4.5vw, 40px);
  line-height: 1.12;
  letter-spacing: -.03em;
}

#chainsim-course-launch-copy {
  margin: 15px 0 27px;
  color: #5d627c;
  font-size: 17px;
  line-height: 1.55;
}

.chainsim-course-launch-progress {
  width: 100%;
  height: 7px;
  overflow: hidden;
  border-radius: 999px;
  background: #e8e9f5;
}

.chainsim-course-launch-progress span {
  display: block;
  width: 42%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #13b9ad, #4445e2);
  animation: chainsim-course-loading 1.25s ease-in-out infinite;
}

#chainsim-course-launch-overlay.is-error .chainsim-course-launch-mark {
  background: linear-gradient(145deg, #ef755f, #d33564);
}

#chainsim-course-launch-overlay.is-error .chainsim-course-launch-progress {
  display: none;
}

#chainsim-course-launch-return {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  box-sizing: border-box;
  margin-top: 6px;
  padding: 0 24px;
  color: #fff;
  border-radius: 14px;
  background: #3f43dd;
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
}

#chainsim-course-launch-return[hidden] {
  display: none;
}

@keyframes chainsim-course-loading {
  0% { transform: translateX(-105%); }
  50% { transform: translateX(70%); }
  100% { transform: translateX(240%); }
}

@media (max-width: 600px) {
  #chainsim-course-launch-overlay { padding: 16px; }
  .chainsim-course-launch-card {
    width: 100%;
    padding: 36px 24px 32px;
    border-radius: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .chainsim-course-launch-progress span { animation-duration: 2.8s; }
}