/* ===== Three-Panel Layout ===== */
.layout {
  display: flex;
  flex-direction: row;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-main);
}

.layout__panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  flex-shrink: 0;
  min-width: 120px;
}

/* ===== Gutter (Drag Handle) ===== */
.layout__gutter {
  flex-shrink: 0;
  background: var(--gutter-color);
  transition: background 0.15s;
  z-index: 20;
}

.layout__gutter--horizontal {
  width: var(--gutter-width);
  cursor: col-resize;
}

.layout__gutter--vertical {
  height: var(--gutter-width);
  cursor: row-resize;
}

.layout__gutter:hover,
.layout__gutter--active {
  background: var(--gutter-hover);
}

/* ===== Panel Header ===== */
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0.6rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  flex-shrink: 0;
  min-height: 32px;
}

.panel-header__title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--accent-cyan);
}

.panel-header__title--editable {
  cursor: pointer;
  transition: color 0.15s;
}

.panel-header__title--editable:hover {
  color: var(--accent-blue);
}

.panel-header__edit {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent-cyan);
  background: var(--bg-main);
  border: 1px solid var(--accent-blue);
  border-radius: var(--radius);
  padding: 0.15rem 0.4rem;
  outline: none;
  width: 200px;
}

.panel-header__actions {
  display: flex;
  gap: 0.3rem;
}

/* ===== Panel Body ===== */
.panel-body {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}