:root {
  --bg: #0f1115;
  --panel: #1a1d24;
  --border: #2a303c;
  --text: #e8eaef;
  --muted: #8b93a7;
  --accent: #6ee7b7;
  --accent-dim: #34d39933;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font: 15px/1.45 system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.top {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.top h1 {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.board-link input {
  width: 10rem;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  padding: 0.35rem 0.5rem;
  border-radius: 6px;
  font: inherit;
}

.sync {
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 5rem;
}

.sync.ok { color: var(--accent); }
.sync.err { color: #f87171; }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.btn {
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  cursor: pointer;
  font: inherit;
}

.btn:hover { border-color: var(--muted); }
.btn.ghost { background: transparent; }
.btn.danger { color: #f87171; }

.board {
  display: flex;
  gap: 1rem;
  padding: 1.25rem;
  overflow-x: auto;
  align-items: flex-start;
  min-height: calc(100vh - 4rem);
}

.column {
  flex: 0 0 280px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 5.5rem);
}

.column-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

.column-head input {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  font-weight: 600;
}

.column-head input:focus { outline: 1px solid var(--accent-dim); border-radius: 4px; }

.cards {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 80px;
}

.cards.drag-over { background: var(--accent-dim); border-radius: 0 0 10px 10px; }

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.65rem;
  cursor: grab;
}

.card:active { cursor: grabbing; }
.card.dragging { opacity: 0.45; }

.card textarea {
  width: 100%;
  border: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  resize: none;
  min-height: 2.5rem;
  field-sizing: content;
}

.card textarea:focus { outline: none; }

.add-card {
  margin: 0 0.5rem 0.5rem;
  text-align: left;
  color: var(--muted);
  border-style: dashed;
}

.empty-hint {
  color: var(--muted);
  font-size: 0.85rem;
  padding: 0.5rem;
  text-align: center;
}