html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
}

body {
  overflow: hidden;
  background: #111;
}

.portfolio-shell,
.shell-view,
.draft-frame,
.case-study-frames,
.case-study-frame {
  width: 100%;
  height: 100%;
}

.portfolio-shell {
  position: relative;
}

.shell-view,
.draft-frame,
.case-study-frame {
  position: absolute;
  inset: 0;
}

.shell-view {
  display: none;
}

.shell-view.is-active,
.draft-frame.is-active,
.case-study-frame.is-active {
  display: block;
}

.draft-frame,
.case-study-frame {
  display: none;
  border: 0;
  background: #fff;
}

.floating-button,
.timeline-controls,
.case-study-launcher {
  font-family: Arial, Helvetica, sans-serif;
}

.floating-button {
  position: fixed;
  right: 18px;
  bottom: 18px;
  z-index: 9999;
  min-width: 108px;
  height: 46px;
  padding: 0 16px;
  border: 2px solid rgba(255, 255, 255, .9);
  border-radius: 999px;
  background: #111;
  color: #fff;
  font-size: 14px;
  font-weight: 700;
  cursor: pointer;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .55);
  opacity: 1;
  transition: background-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.floating-button:hover,
.floating-button:focus-visible {
  background: #2b2b2b;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .65);
  transform: translateY(-2px);
}

.floating-button:focus-visible,
.timeline-button:focus-visible,
.timeline-chapter:focus-visible,
.case-study-launcher:focus-visible {
  outline: 2px solid #fff;
  outline-offset: 3px;
}

.timeline-controls {
  position: fixed;
  left: 50%;
  bottom: 18px;
  z-index: 9999;
  display: flex;
  align-items: center;
  gap: 8px;
  max-width: calc(100vw - 36px);
  padding: 10px;
  border-radius: 14px;
  background: rgba(17, 17, 17, .9);
  box-shadow: 0 8px 24px rgba(0, 0, 0, .45);
  transform: translateX(-50%);
}

.timeline-controls[hidden] {
  display: none;
}

.timeline-button,
.timeline-chapter,
.case-study-launcher {
  border: none;
  background: rgba(255, 255, 255, .1);
  color: #fff;
  cursor: pointer;
  font-weight: 700;
  transition: background-color .2s ease, transform .2s ease, opacity .2s ease;
}

.timeline-button:hover,
.timeline-chapter:hover,
.case-study-launcher:hover {
  background: rgba(255, 255, 255, .2);
  transform: translateY(-1px);
}

.timeline-button {
  min-width: 42px;
  height: 38px;
  padding: 0 12px;
  border-radius: 999px;
}

.timeline-arrow {
  width: 38px;
  min-width: 38px;
  padding: 0;
  font-size: 18px;
}

.timeline-home {
  min-width: 84px;
}

.timeline-chapters {
  display: flex;
  gap: 6px;
  max-width: min(720px, calc(100vw - 220px));
  overflow-x: auto;
  scrollbar-width: thin;
}

.timeline-chapter {
  min-width: 44px;
  height: 36px;
  padding: 0 12px;
  border-radius: 999px;
  white-space: nowrap;
}

.timeline-chapter.is-active {
  background: #fff;
  color: #111;
}

.case-study-launcher {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 10px 16px;
  border-radius: 999px;
  text-decoration: none;
}

.cleanup-note {
  margin-top: 8px;
  opacity: .72;
  font-size: .92em;
}

@media (max-width: 700px) {
  .timeline-controls {
    right: 10px;
    left: 10px;
    bottom: 10px;
    transform: none;
  }

  .timeline-home {
    min-width: 74px;
    padding: 0 10px;
  }

  .timeline-chapters {
    max-width: none;
    flex: 1;
  }
}