* { box-sizing: border-box; }
:root {
  --color-bg: #f6f7f9;
  --color-surface: #ffffff;
  --color-surface-alt: #f1f4f8;
  --color-border: #d7dbe3;
  --color-border-subtle: #e4e7ee;
  --color-text: #1a1f2b;
  --color-text-muted: #5b6372;
  --color-accent: #2563eb;
  --color-accent-strong: #1d4ed8;
  --color-accent-soft: #93c5fd;
  --color-danger-bg: #fde8e8;
  --color-danger-border: #f8c4c4;
  --color-danger-text: #8c1b1b;
  --color-warning-bg: #fdf1cf;
  --color-warning-border: #f9dc8a;
  --color-warning-text: #8a520c;
  --shadow-soft: 0 6px 18px rgba(15, 23, 42, 0.08);
  --shadow-subtle: 0 2px 6px rgba(15, 23, 42, 0.05);
  --radius-xs: 6px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --font-size-xs: 0.8rem;
  --font-size-sm: 0.9rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
}
html, body { height: 100%; margin: 0; font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif; color: var(--color-text); background: var(--color-bg); font-size: var(--font-size-base); }
body { display: flex; flex-direction: column; min-height: 100vh; }
button, select, input, textarea { font-family: inherit; font-size: inherit; color: inherit; }
button {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-subtle);
}
input[type="file"] {
  color: transparent;
  font-size: 0;
}
input[type="file"]::file-selector-button,
input[type="file"]::-webkit-file-upload-button {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  padding: var(--space-2xs) var(--space-sm);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-subtle);
  margin-right: var(--space-xs);
  font-size: var(--font-size-sm);
}
input[type="file"]::file-selector-button:hover,
input[type="file"]::-webkit-file-upload-button:hover {
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-subtle);
}
input[type="file"]::file-selector-button:active,
input[type="file"]::-webkit-file-upload-button:active {
  background: var(--color-border-subtle);
  border-color: var(--color-border);
}
button:hover:not(:disabled) {
  background: var(--color-surface-alt);
  box-shadow: var(--shadow-subtle);
}
button:active:not(:disabled) {
  background: var(--color-border-subtle);
  border-color: var(--color-border);
}
button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
  box-shadow: none;
}
.topbar { display: flex; align-items: center; justify-content: space-between; padding: var(--space-xs) var(--space-md); border-bottom: 1px solid var(--color-border-subtle); background: var(--color-surface); box-shadow: var(--shadow-subtle); }
.topbar h1 { font-size: var(--font-size-lg); margin: 0; font-weight: 600; color: var(--color-text); }
.toolbar button { margin-right: var(--space-xs); }
.toolbar button.active {
  font-weight: 600;
  background: var(--color-accent);
  color: #fff;
  border-color: var(--color-accent);
}
.app-messages { display: flex; align-items: flex-start; justify-content: space-between; gap: var(--space-sm); padding: var(--space-xs) var(--space-md); border-bottom: 1px solid var(--color-border-subtle); background: var(--color-surface-alt); color: var(--color-text); box-shadow: var(--shadow-subtle); }
.app-messages__content { display: grid; gap: var(--space-2xs); flex: 1; }
.app-messages__text { flex: 1; font-weight: 600; }
.app-messages__details { display: grid; gap: var(--space-2xs); }
.app-messages__dismiss { border: none; background: transparent; font-size: 1.25rem; line-height: 1; cursor: pointer; color: inherit; padding: var(--space-2xs); border-radius: var(--radius-xs); transition: background-color 0.2s ease; }
.app-messages__dismiss:hover { background: rgba(15, 23, 42, 0.08); }
.layout { flex: 1; display: grid; grid-template-columns: minmax(0, 0.6fr) minmax(0, 0.4fr); gap: 0; min-height: 0; }
.layout.layout--edit { grid-template-columns: minmax(0, 0.6fr) minmax(0, 0.4fr); }
.pane { border-right: 1px solid var(--color-border-subtle); padding: var(--space-md); overflow: auto; background: var(--color-surface); }
.pane:last-child { border-right: none; }
#left-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
#left-pane .stage,
#left-pane .graph-container {
  flex: 1 1 auto;
  min-height: 0;
}
.placeholder { border: 2px dashed var(--color-border); border-radius: var(--radius-md); padding: var(--space-lg); text-align: center; color: var(--color-text-muted); background: var(--color-surface); box-shadow: var(--shadow-subtle); }
.stage { display: flex; align-items: center; justify-content: center; background: var(--color-surface-alt); color: var(--color-text); border-radius: var(--radius-md); overflow: hidden; box-shadow: var(--shadow-soft); max-height: 100%; width: 100%; min-height: 0; }
.stage img { display: block; max-width: 100%; max-height: 100%; width: auto; height: auto; object-fit: contain; }
.stage-empty { padding: var(--space-lg); color: var(--color-text-muted); }
.graph-container { min-height: 100%; overflow: auto; padding: var(--space-md); }
.graph-empty { color: var(--color-text-muted); text-align: center; margin-top: var(--space-lg); }
.graph-host { display: flex; justify-content: center; align-items: flex-start; }
.graph-host svg { max-width: none; height: auto; }
.graph-node { fill: #f6f8fb; stroke: var(--color-border); stroke-width: 2; cursor: pointer; transition: fill 0.2s ease, stroke 0.2s ease; }
.graph-node.is-selected { fill: #e3ecff; stroke: var(--color-accent); }
.graph-nodes g:focus-visible .graph-node { stroke: var(--color-accent-strong); stroke-width: 3; }
.graph-node-title { font-weight: 600; fill: var(--color-text); }
.graph-node-subtitle { font-size: var(--font-size-xs); fill: var(--color-text-muted); }
.graph-node-thumb { clip-path: inset(0 round var(--radius-md)); }
.graph-connectors { fill: none; stroke: #9ca3af; stroke-width: 2; }
.graph-arrowhead { fill: #9ca3af; }
.graph-connectors path { transition: stroke 0.2s ease; }
.inspector { display: grid; gap: var(--space-md); }
.inspector-header { display: flex; align-items: center; justify-content: space-between; gap: var(--space-sm); }
.inspector-header h3 { margin: 0; font-size: var(--font-size-lg); }
.inspector-actions { display: flex; gap: var(--space-xs); flex-wrap: wrap; }
.field { display: grid; gap: var(--space-2xs); }
.field > span { font-size: var(--font-size-sm); color: var(--color-text-muted); }
.image-preview { min-height: 120px; background: var(--color-surface-alt); border: 1px dashed var(--color-border); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; overflow: hidden; }
.image-preview img { max-width: 100%; max-height: 160px; object-fit: cover; }
.dialogue-editor, .choice-editor { display: grid; gap: var(--space-sm); }
.dialogue-line, .choice-row { display: grid; gap: var(--space-xs); padding: var(--space-sm); border: 1px solid var(--color-border-subtle); border-radius: var(--radius-sm); background: var(--color-surface); box-shadow: var(--shadow-subtle); }
.dialogue-line textarea { width: 100%; }
.audio-info { font-size: var(--font-size-sm); color: var(--color-text-muted); display: flex; align-items: center; gap: var(--space-xs); }
.player-panel { display: grid; gap: var(--space-lg); }
.player-history { display: grid; gap: var(--space-xs); padding: var(--space-sm) var(--space-md); background: var(--color-surface-alt); border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); box-shadow: var(--shadow-subtle); }
.player-history-title { margin: 0; font-size: var(--font-size-sm); color: var(--color-text); text-transform: uppercase; letter-spacing: 0.03em; }
.player-history-nav { display: flex; gap: var(--space-xs); flex-wrap: wrap; align-items: center; }
.player-history-nav button {
  padding: var(--space-2xs) var(--space-sm);
  font-size: var(--font-size-sm);
  background: transparent;
  box-shadow: none;
  border-color: var(--color-border-subtle);
}
.player-history-nav button:hover:not(:disabled) { background: var(--color-surface-alt); box-shadow: none; }
.player-history-nav button:disabled { opacity: 0.6; cursor: not-allowed; }
.player-history-list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  column-gap: 0;
  row-gap: var(--space-xs);
  margin: 0;
  padding: 0;
}
.player-history-list li {
  display: inline-flex;
  align-items: center;
  margin: 0;
}
.player-history-entry {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-2xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.player-history-entry:hover:not(:disabled) { background: var(--color-surface-alt); box-shadow: var(--shadow-subtle); }
.player-history-entry:disabled { cursor: default; opacity: 0.85; }
.player-history-entry[aria-current] { background: var(--color-accent); border-color: var(--color-accent); color: #fff; cursor: default; box-shadow: var(--shadow-subtle); }
.player-history-list li + li::before {
  content: '→';
  color: currentColor;
  font-size: 0.85em;
  line-height: 1;
  margin: 0 var(--space-2xs);
}
.player-dialogue { display: grid; gap: var(--space-sm); padding: var(--space-md); background: var(--color-surface); border: 1px solid var(--color-border-subtle); border-radius: var(--radius-md); box-shadow: var(--shadow-subtle); }
.player-dialogue-line { display: flex; justify-content: flex-start; padding-bottom: var(--space-xs); width: 100%; }
.player-dialogue-bubble {
  position: relative;
  display: flex;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-subtle);
  max-width: 100%;
  width: 100%;
}
.player-dialogue-bubble::before {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: inherit;
  pointer-events: none;
  border: 2px solid transparent;
  opacity: 0;
  transform: scale(0.98);
  transition: opacity 0.2s ease, transform 0.2s ease;
}
.player-dialogue-bubble::after {
  content: '';
  position: absolute;
  left: calc(var(--space-md) + 0.25rem);
  bottom: -6px;
  width: 12px;
  height: 12px;
  background: var(--color-surface-alt);
  border-bottom: 1px solid var(--color-border-subtle);
  border-right: 1px solid var(--color-border-subtle);
  transform: rotate(45deg);
  box-shadow: 2px 2px 4px rgba(15, 23, 42, 0.06);
}
.player-dialogue-bubble.is-playing {
  background: rgba(37, 99, 235, 0.12);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.25), var(--shadow-subtle);
}
.player-dialogue-bubble.is-playing::after {
  background: rgba(37, 99, 235, 0.12);
  border-bottom-color: var(--color-accent);
  border-right-color: var(--color-accent);
  box-shadow: 2px 2px 6px rgba(37, 99, 235, 0.2);
}
.player-dialogue-bubble.is-playing::before {
  border-color: rgba(37, 99, 235, 0.35);
  opacity: 1;
  transform: scale(1);
}
.player-dialogue-bubble p {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
}
.dialogue-bubble-play {
  padding: var(--space-2xs) var(--space-sm);
  background: var(--color-surface);
  border-color: var(--color-border);
  box-shadow: none;
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2xs);
}
.dialogue-bubble-play:hover:not(:disabled) {
  background: var(--color-surface-alt);
}
.player-dialogue-bubble.is-playing .dialogue-bubble-play {
  border-color: var(--color-accent);
}

@keyframes playerDialogueBubblePulse {
  0% {
    opacity: 0.4;
    transform: scale(0.96);
  }
  50% {
    opacity: 0.75;
    transform: scale(1.02);
  }
  100% {
    opacity: 0.4;
    transform: scale(0.96);
  }
}

@media (prefers-reduced-motion: no-preference) {
  .player-dialogue-bubble.is-playing::before {
    animation: playerDialogueBubblePulse 2.4s ease-in-out infinite;
  }
}
.player-choices { display: grid; gap: var(--space-xs); }
.player-choices button {
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-base);
  background: var(--color-accent-soft);
  color: var(--color-text);
  border-color: var(--color-accent-soft);
  box-shadow: var(--shadow-soft);
}
.player-choices button:hover:not(:disabled) {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}
.player-choices button:active:not(:disabled) {
  background: var(--color-accent-strong);
  border-color: var(--color-accent-strong);
  color: #fff;
}
.player-choices button:disabled {
  background: var(--color-border-subtle);
  color: var(--color-text-muted);
  border-color: var(--color-border-subtle);
}
.player-choices .the-end { font-size: var(--font-size-xl); text-align: center; font-weight: 600; }
.validation-results { display: grid; gap: var(--space-xs); }
.validation-errors { background: var(--color-danger-bg); border: 1px solid var(--color-danger-border); color: var(--color-danger-text); padding: var(--space-xs) var(--space-sm); border-radius: var(--radius-sm); }
.validation-warnings { background: var(--color-warning-bg); border: 1px solid var(--color-warning-border); color: var(--color-warning-text); padding: var(--space-xs) var(--space-sm); border-radius: var(--radius-sm); }
.validation-ok { color: #166534; font-weight: 600; }
button:focus-visible, select:focus-visible, textarea:focus-visible, input:focus-visible { outline: 3px solid var(--color-accent); outline-offset: 2px; }
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .pane { border-right: none; border-bottom: 1px solid var(--color-border-subtle); }
  .pane:last-child { border-bottom: none; }
  .layout.layout--edit { grid-template-columns: 1fr; }
}