/* =====================================================================
   kanban.css — Horizontally scrollable board + columns
   ===================================================================== */

.kanban-board {
  display: flex;
  justify-content: space-between;
  gap: var(--sp-4);
  align-items: stretch;
  overflow-x: auto;
  overflow-y: hidden;
  /* fill the remaining flex height; columns scroll internally */
  flex: 1;
  min-height: 0;
  scroll-snap-type: x proximity;
}
.kanban-board:focus-visible { outline: none; }

.kanban-column {
  flex: 0 0 var(--column-w);
  width: var(--column-w);
  display: flex;
  flex-direction: column;
  background: rgba(232, 237, 244, 0.5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  max-height: 100%;          /* fill the board height; body scrolls internally */
  scroll-snap-align: start;
  transition: box-shadow var(--t-base), border-color var(--t-base);
}
.kanban-column:hover { border-color: var(--color-border-strong); }

.column-header {
  position: sticky;
  top: 0;
  z-index: 5;
  display: flex; align-items: center; gap: var(--sp-2);
  padding: var(--sp-3) var(--sp-4);
  background: rgba(248, 250, 252, 0.92);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.column-accent { width: 10px; height: 10px; border-radius: 3px; background: var(--col-accent, var(--color-primary)); flex-shrink: 0; }
.column-title { font-size: var(--fs-md); font-weight: var(--fw-bold); color: var(--text-strong); letter-spacing: 0.01em; }
.column-count {
  margin-left: auto;
  font-size: var(--fs-xs); font-weight: var(--fw-semibold);
  background: var(--color-card); color: var(--text-muted);
  border: 1px solid var(--color-border);
  padding: 1px 9px; border-radius: var(--radius-pill); min-width: 24px; text-align: center;
}

.column-body {
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--sp-3);
  display: flex; flex-direction: column; gap: var(--sp-3);
  flex: 1;
}

/* Empty state inside a column */
.column-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--sp-2); padding: var(--sp-8) var(--sp-4);
  color: var(--text-faint); text-align: center;
}
.column-empty svg { opacity: 0.5; }
.column-empty p { font-size: var(--fs-sm); }

/* Global empty / error states */
.board-empty {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: var(--sp-4); padding: var(--sp-10) var(--sp-6);
  width: 100%; text-align: center; color: var(--text-muted);
}
.board-empty .empty-art { width: 140px; height: 140px; opacity: 0.9; }
.board-empty h3 { font-size: var(--fs-xl); color: var(--text-strong); }
.board-empty p { font-size: var(--fs-base); max-width: 420px; }
.board-empty button {
  padding: var(--sp-2) var(--sp-5); border-radius: var(--radius-sm);
  background: var(--color-primary); color: #fff; font-weight: var(--fw-semibold);
  box-shadow: var(--shadow-sm); transition: background var(--t-fast), transform var(--t-fast);
}
.board-empty button:hover { background: var(--color-primary-hover); transform: translateY(-1px); }