:root {
  color-scheme: dark;
  --background: #070809;
  --surface: rgba(14, 17, 20, 0.88);
  --surface-strong: rgba(20, 24, 28, 0.96);
  --line: rgba(255, 255, 255, 0.12);
  --text: #f3f6f8;
  --muted: #9aa4ae;
  --accent: #f0c15a;
  --control: rgba(255, 255, 255, 0.07);
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--background);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
}

button,
a {
  font: inherit;
}

.shell {
  min-height: 100svh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr) auto;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 28rem),
    var(--background);
}

.topbar {
  display: grid;
  grid-template-columns: minmax(18rem, 1fr) auto auto;
  align-items: center;
  gap: 1rem;
  min-height: 5.5rem;
  padding: 0.9rem 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--surface-strong);
}

.brand h1 {
  margin: 0;
  font-size: clamp(1.05rem, 1.6vw, 1.45rem);
  font-weight: 680;
  line-height: 1.1;
}

.brand p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.prompt-tabs,
.context-switch,
.viewer-actions {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.prompt-tab,
.context-button,
.scene-jump,
.viewer-actions a,
.viewer-actions button,
.prompt-panel-actions a,
.prompt-panel-actions button {
  border: 1px solid var(--line);
  color: var(--text);
  background: var(--control);
  cursor: pointer;
  text-decoration: none;
  transition: background 160ms ease, border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.prompt-tab,
.context-button,
.viewer-actions a,
.viewer-actions button {
  min-height: 2.5rem;
  border-radius: 999px;
  padding: 0 0.95rem;
}

.prompt-tab:hover,
.context-button:hover,
.scene-jump:hover,
.viewer-actions a:hover,
.viewer-actions button:hover,
.prompt-panel-actions a:hover,
.prompt-panel-actions button:hover {
  border-color: rgba(240, 193, 90, 0.72);
  background: rgba(240, 193, 90, 0.12);
}

.prompt-tab.is-active,
.context-button.is-active,
.scene-jump.is-active {
  color: #111111;
  border-color: var(--accent);
  background: var(--accent);
}

.viewer {
  position: relative;
  min-height: 0;
  background: #000;
  overflow: hidden;
}

.viewer iframe {
  width: 100%;
  height: 100%;
  min-height: calc(100svh - 11.7rem);
  display: block;
  border: 0;
  background: #000;
}

.viewer-actions {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  padding: 0.35rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.56);
  backdrop-filter: blur(16px);
}

.viewer-actions a,
.viewer-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  background: rgba(255, 255, 255, 0.08);
}

.prompt-backdrop {
  position: fixed;
  inset: 0;
  z-index: 20;
  background: rgba(0, 0, 0, 0.48);
}

.prompt-panel {
  position: fixed;
  top: 1rem;
  right: 1rem;
  bottom: 1rem;
  z-index: 21;
  width: min(44rem, calc(100vw - 2rem));
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(10, 12, 14, 0.96);
  box-shadow: 0 1.5rem 5rem rgba(0, 0, 0, 0.46);
  backdrop-filter: blur(18px);
  transform: translateX(0);
  opacity: 1;
  transition: opacity 180ms ease, transform 180ms ease;
}

.prompt-panel[aria-hidden="true"] {
  pointer-events: none;
  opacity: 0;
  transform: translateX(1.5rem);
}

.prompt-panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem;
  border-bottom: 1px solid var(--line);
}

.prompt-panel-header p,
.prompt-panel-header h2 {
  margin: 0;
}

.prompt-panel-header p {
  color: var(--accent);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.prompt-panel-header h2 {
  margin-top: 0.32rem;
  font-size: 1.2rem;
  line-height: 1.15;
}

.prompt-panel-actions {
  display: flex;
  gap: 0.45rem;
  flex: 0 0 auto;
}

.prompt-panel-actions a,
.prompt-panel-actions button {
  min-height: 2.25rem;
  border-radius: 999px;
  padding: 0 0.75rem;
  text-decoration: none;
  font-size: 0.82rem;
}

.prompt-content {
  min-height: 0;
  margin: 0;
  padding: 1rem;
  overflow: auto;
  color: #e8edf2;
  font-size: 0.92rem;
  line-height: 1.55;
}

.prompt-content h2,
.prompt-content h3,
.prompt-content h4,
.prompt-content p,
.prompt-content ul {
  margin: 0;
}

.prompt-content h2 {
  font-size: 1.15rem;
  line-height: 1.15;
}

.prompt-content h3,
.prompt-content h4 {
  margin-top: 1.25rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 760;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.prompt-content p {
  margin-top: 0.75rem;
  color: #dce3ea;
}

.prompt-content ul {
  display: grid;
  gap: 0.42rem;
  margin-top: 0.72rem;
  padding-left: 1.1rem;
}

.prompt-content li {
  padding-left: 0.2rem;
  color: #dce3ea;
}

.prompt-content strong {
  color: #ffffff;
}

.scene-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 0;
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.scene-jump {
  min-height: 6.2rem;
  border-width: 0 1px 0 0;
  border-radius: 0;
  padding: 1rem;
  text-align: left;
}

.scene-jump:last-child {
  border-right: 0;
}

.scene-jump span,
.scene-jump strong {
  display: block;
}

.scene-jump span {
  color: currentColor;
  font-size: 0.85rem;
  opacity: 0.72;
}

.scene-jump strong {
  margin-top: 0.4rem;
  font-size: clamp(0.95rem, 1.4vw, 1.12rem);
  font-weight: 660;
  line-height: 1.1;
}

.is-switching iframe {
  opacity: 0.18;
  transform: scale(0.994);
}

.viewer iframe {
  opacity: 1;
  transform: scale(1);
  transition: opacity 180ms ease, transform 180ms ease;
}

@media (max-width: 1020px) {
  .topbar {
    grid-template-columns: 1fr;
    align-items: stretch;
  }

  .prompt-tabs,
  .context-switch {
    overflow-x: auto;
    padding-bottom: 0.1rem;
  }

  .prompt-tab,
  .context-button {
    flex: 0 0 auto;
  }

  .scene-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .topbar {
    min-height: auto;
    padding: 0.8rem;
    gap: 0.75rem;
  }

  .brand h1 {
    font-size: 1rem;
  }

  .brand p {
    font-size: 0.78rem;
  }

  .prompt-tab,
  .context-button,
  .viewer-actions a,
  .viewer-actions button {
    min-height: 2.25rem;
    padding: 0 0.75rem;
    font-size: 0.82rem;
  }

  .viewer iframe {
    min-height: 62svh;
  }

  .viewer-actions {
    left: 0.75rem;
    right: 0.75rem;
    justify-content: center;
  }

  .scene-strip {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .scene-jump {
    min-height: 4.8rem;
    padding: 0.8rem;
  }

  .prompt-panel {
    top: 0.75rem;
    right: 0.75rem;
    bottom: 0.75rem;
    width: calc(100vw - 1.5rem);
  }

  .prompt-panel-header {
    display: grid;
  }

  .prompt-panel-actions {
    flex-wrap: wrap;
  }
}