/* ============================================================
   Layout
   ============================================================ */
.app {
  height: 100vh;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem 2rem;
  position: relative;
  z-index: 1;
}

.panel,
.topbar {
  background: var(--card-bg);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

/* ============================================================
   Top bar
   ============================================================ */
.topbar {
  display: flex;
  align-items: center;
  gap: 1.1rem;
  padding: 0.75rem 1.25rem;
}

.topbar__back {
  font-size: 1.15rem;
  color: var(--text-muted);
  transition: color var(--transition);
}
.topbar__back:hover { color: var(--primary); }

.topbar__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  margin-right: auto;
}

.topbar__title {
  font-family: var(--font-head);
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.topbar__subtitle {
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.topbar .tool-card__tag { margin-top: 0; }

/* ============================================================
   Mode switch
   ============================================================ */
.modes {
  display: flex;
  padding: 0.2rem;
  gap: 0.2rem;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--card-border);
  border-radius: 999px;
}

.mode {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: none;
  border-radius: 999px;
  padding: 0.4rem 1rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background var(--transition), color var(--transition);
}
.mode:hover { color: var(--text); }
.mode.active {
  background: var(--primary);
  color: #fff;
}

/* ============================================================
   Workspace
   ============================================================ */
.workspace {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(300px, 1fr) minmax(0, 1.35fr);
  gap: 1rem;
}

.panel {
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 0;
  overflow: hidden;
}

.panel__head {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--card-border);
  min-height: 3rem;
}

.panel__label {
  font-family: var(--font-head);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-right: auto;
}

/* ============================================================
   Examples
   ============================================================ */
.examples {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.examples__label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-right: 0.2rem;
}

.chip {
  font-family: var(--font-head);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--card-border);
  border-radius: 999px;
  padding: 0.2rem 0.75rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.chip:hover {
  border-color: var(--card-hover);
  color: var(--text);
  background: rgba(62, 165, 135, 0.15);
}

/* ============================================================
   Text editor
   ============================================================ */
#source {
  flex: 1;
  min-height: 0;
  width: 100%;
  padding: 1rem 1.1rem;
  background: rgba(0, 0, 0, 0.22);
  color: var(--text);
  border: none;
  outline: none;
  resize: none;
  font-family: 'Roboto Mono', ui-monospace, monospace;
  font-size: 0.92rem;
  line-height: 1.55;
  tab-size: 4;
  white-space: pre;
  overflow: auto;
}
#source::selection { background: rgba(62, 165, 135, 0.45); }
#source::placeholder { color: var(--text-muted); font-family: var(--font-body); white-space: pre-wrap; }

.messages {
  list-style: none;
  font-size: 0.83rem;
  line-height: 1.45;
  border-top: 1px solid var(--card-border);
  padding: 0.6rem 1rem;
  max-height: 9rem;
  overflow-y: auto;
}
.messages:empty { display: none; }

.panel__foot {
  display: flex;
  gap: 0.5rem;
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--card-border);
}

.file-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-head);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.9rem;
  cursor: pointer;
  transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.file-button:hover:not(:disabled) {
  border-color: var(--card-hover);
  color: var(--text);
  background: rgba(62, 165, 135, 0.15);
}
.file-button:disabled { opacity: 0.4; cursor: default; }
.messages li { margin: 0.15rem 0; display: flex; gap: 0.5rem; }
.messages i { margin-top: 0.2rem; }
.messages .error { color: #ff9a6b; }
.messages .warning { color: #f0c05a; }

/* ============================================================
   Image
   ============================================================ */
.image-info {
  font-size: 0.82rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
}
.toggle input { accent-color: var(--primary); }

.stage {
  flex: 1;
  min-height: 0;
  position: relative;
  background: #111615;
}

#image-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  touch-action: none;
}
#image-canvas.editable { cursor: crosshair; }

/* ============================================================
   Toolbar
   ============================================================ */
.toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  padding: 0.65rem 1rem;
  border-top: 1px solid var(--card-border);
  min-height: 3.4rem;
  font-size: 0.85rem;
}

.tool {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}
.tool[hidden] { display: none; }
.tool i { color: var(--text-muted); }

.tool__value,
.hover-info {
  font-family: 'Roboto Mono', ui-monospace, monospace;
  font-size: 0.82rem;
}

.hover-info {
  margin-left: auto;
  color: var(--text-muted);
}

.swatch {
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.3);
  flex-shrink: 0;
}

#grey-range {
  width: 180px;
  accent-color: var(--primary);
}

.number {
  width: 4.5rem;
  padding: 0.3rem 0.5rem;
  font-family: 'Roboto Mono', ui-monospace, monospace;
  font-size: 0.85rem;
  color: var(--text);
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
}

#color-input {
  width: 2.6rem;
  height: 2rem;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
}
#color-input::-webkit-color-swatch-wrapper { padding: 0; }
#color-input::-webkit-color-swatch { border: none; border-radius: calc(var(--radius-sm) - 1px); }
#color-input::-moz-color-swatch { border: none; border-radius: calc(var(--radius-sm) - 1px); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 800px) {
  .topbar { flex-wrap: wrap; }
  .modes { width: 100%; }
  .mode { flex: 1; padding: 0.4rem 0.5rem; }
  .app { height: auto; min-height: 100vh; padding: 1rem 1.25rem; }
  .workspace { grid-template-columns: 1fr; }
  #source { min-height: 260px; }
  .stage { height: 60vh; flex: none; }
  .hover-info { margin-left: 0; }
}