:root {
  --bg: #f4f5f7;
  --column-bg: #ebecf0;
  --card-bg: #ffffff;
  --text: #172b4d;
  --muted: #5e6c84;
  --accent: #0052cc;
  --accent-hover: #0747a6;
  --danger: #de350b;
  --danger-hover: #bf2600;
  --border: #dfe1e6;
  --shadow: 0 1px 2px rgba(9, 30, 66, 0.25);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d2125;
    --column-bg: #161a1d;
    --card-bg: #22272b;
    --text: #b6c2cf;
    --muted: #8c9bab;
    --accent: #579dff;
    --accent-hover: #85b8ff;
    --danger: #f87462;
    --danger-hover: #fd9891;
    --border: #38414a;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding-top: 34px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 12px;
}

.app-header h1 {
  font-size: 20px;
  margin: 0;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.file-status {
  font-size: 13px;
  color: var(--muted);
  margin-right: 4px;
}

.board {
  display: flex;
  gap: 48px;
  padding: 24px;
  align-items: flex-start;
  justify-content: center;
}

.column {
  background: #ffffff;
  border-radius: 8px;
  padding: 12px;
  width: 672px;
  flex-shrink: 0;
  min-height: 200px;
}

.column-title {
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--muted);
  margin: 4px 8px 12px;
}

.card-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  min-height: 40px;
  align-items: start;
}

.card-list.drag-over {
  outline: 2px dashed var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.group-header {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--muted);
  margin-top: 10px;
  padding-top: 8px;
}

.group-header-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--type-color);
  flex-shrink: 0;
}

.group-header:first-child {
  margin-top: 0;
  padding-top: 0;
}

.card {
  background: var(--type-bg, var(--card-bg));
  border-radius: 6px;
  padding: 10px 12px;
  box-shadow: var(--shadow);
  cursor: grab;
  border: 1px solid var(--border);
  border-left: 4px solid var(--type-color);
}

.card:hover {
  border-color: var(--border);
  border-left-color: var(--type-color);
}

.card.dragging {
  opacity: 0.5;
}

.card-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 6px;
}

.card-title {
  font-size: 14px;
  font-weight: 700;
  margin: 0;
  word-break: break-word;
}

.card-badges {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
  margin-top: 1px;
}

.badge-icon {
  font-size: 12px;
  line-height: 1;
}

.badge-new {
  color: #f5a623;
}

.badge-changed {
  color: var(--accent);
}

.empty-hint {
  grid-column: 1 / -1;
  color: var(--muted);
  font-size: 13px;
  padding: 8px;
}

.btn {
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  padding: 8px 14px;
  border-radius: 4px;
  font-size: 14px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}

.btn:hover {
  filter: brightness(0.97);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger);
  color: #fff;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(9, 30, 66, 0.54);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}

.modal-backdrop.hidden {
  display: none;
}

.modal {
  background: var(--card-bg);
  color: var(--text);
  border-radius: 8px;
  padding: 20px;
  width: 360px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.modal h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

.modal label {
  font-size: 12px;
  color: var(--muted);
  margin-top: 8px;
}

.modal input,
.modal select {
  padding: 8px;
  border-radius: 4px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
}

.modal-checkbox-row {
  display: flex;
  gap: 16px;
  margin-top: 10px;
}

.modal label.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 0;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
}

.modal label.checkbox-label input[type='checkbox'] {
  width: auto;
  padding: 0;
}

.modal-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
}

.modal-actions-right {
  display: flex;
  gap: 8px;
}

.hidden {
  display: none !important;
}