/* =============================================================================
   Layout em 3 colunas: painel esquerdo | canvas central | painel direito
   Objetivo: ocupar a altura da viewport sem rolagem vertical na página.
   ============================================================================= */

:root {
  --bg: #0f1419;
  --panel: #1a2332;
  --text: #e6edf3;
  --muted: #8b9cb3;
  --accent: #3b82f6;
  --accent-dim: #2563eb;
  --danger: #ef4444;
  --success: #22c55e;
  --border: #2d3a4f;
  --canvas-bg: #0b0f14;
}

* {
  box-sizing: border-box;
}

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

body {
  display: flex;
  flex-direction: column;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow: hidden; /* evita scroll vertical na página inteira */
}

.app-header {
  flex-shrink: 0;
  padding: 0.45rem 1rem 0.55rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(180deg, #151c28, var(--bg));
}

.app-header h1 {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
}

/* Grade principal: laterais fixas (min) + centro flexível */
.workspace {
  flex: 1;
  min-height: 0;
  width: 100%;
  display: grid;
  grid-template-columns: minmax(200px, 15rem) minmax(0, 1fr) minmax(210px, 16rem);
  grid-template-rows: 1fr;
  gap: 0.65rem;
  padding: 0.65rem;
  align-items: stretch;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.65rem 0.75rem;
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden; /* conteúdo compacto para evitar scroll nos painéis */
}

.panel__title {
  margin: 0 0 0.45rem;
  font-size: 0.72rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}

.panel__title--spaced {
  margin-top: 0.65rem;
}

.hint {
  font-size: 0.75rem;
  color: var(--muted);
  margin: 0 0 0.5rem;
  line-height: 1.35;
}

.btn-group {
  display: flex;
  flex-direction: column;
  gap: 0.32rem;
}

.btn-group.transforms {
  margin-top: 0.15rem;
}

.mode-btn {
  appearance: none;
  border: 1px solid var(--border);
  background: #243044;
  color: var(--text);
  padding: 0.42rem 0.5rem;
  border-radius: 7px;
  cursor: pointer;
  font-size: 0.8rem;
  text-align: left;
  transition: background 0.15s, border-color 0.15s, transform 0.05s;
}

.mode-btn:hover {
  background: #2c3c54;
  border-color: #3d4f6a;
}

.mode-btn:active {
  transform: scale(0.98);
}

.mode-btn.active {
  background: var(--accent);
  border-color: var(--accent-dim);
  font-weight: 600;
}

.mode-btn.danger {
  border-color: #7f1d1d;
  background: #3f1518;
}

.mode-btn.danger:hover {
  background: #5c1a1f;
}

.mode-btn.secondary {
  margin-top: 0.45rem;
  background: #1e293b;
}

.control-block {
  margin-bottom: 0.55rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border);
}

.control-block:last-of-type {
  border-bottom: none;
  margin-bottom: 0.35rem;
  padding-bottom: 0.35rem;
}

.control-block label {
  display: block;
  font-size: 0.74rem;
  margin: 0.2rem 0 0.08rem;
}

.control-block input[type="range"] {
  width: 100%;
  margin-bottom: 0.15rem;
}

.apply-btn {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.38rem;
  border-radius: 7px;
  border: 1px solid var(--success);
  background: #14532d;
  color: #dcfce7;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.78rem;
}

.apply-btn:hover {
  filter: brightness(1.08);
}

.checkbox-row {
  display: flex;
  align-items: flex-start;
  gap: 0.4rem;
  font-size: 0.74rem;
  color: var(--muted);
  cursor: pointer;
  margin: 0 0 0.35rem;
  line-height: 1.35;
}

/* Centro: canvas centralizado entre os painéis */
.stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-width: 0;
  min-height: 0;
}

.canvas-wrap {
  background: var(--canvas-bg);
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 0;
  display: block;
  max-width: 100%;
  max-height: calc(100vh - 7.5rem);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
}

#gfx {
  display: block;
  width: 100%;
  max-width: 800px;
  height: auto;
  max-height: calc(100vh - 8.5rem);
  image-rendering: pixelated;
  cursor: crosshair;
}

.status-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.9rem;
  margin-top: 0.45rem;
  font-size: 0.74rem;
  color: var(--muted);
  justify-content: center;
}

.status-bar strong {
  color: var(--text);
}

/* Telas estreitas: empilha painéis (pode exigir scroll mínimo — prioridade: desktop acadêmico) */
@media (max-width: 1100px) {
  .workspace {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    overflow-y: auto;
    align-items: stretch;
  }

  body {
    overflow: auto;
  }

  #gfx {
    max-height: none;
  }
}