:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-sunken: #eef0f4;
  --border: #e3e6ec;
  --border-strong: #cdd2dc;

  --ink: #191d27;
  --ink-soft: #5b6272;
  --ink-faint: #9aa1b1;

  --accent: #3556e8;
  --accent-hover: #2a46c9;
  --accent-soft: #e8ecfd;

  --status-todo: #8b93a7;
  --status-progress: #3556e8;
  --status-review: #d99118;
  --status-done: #1f9d61;

  --danger: #d64545;
  --danger-soft: #fdeaea;
  --warn-soft: #fdf3e0;
  --ok-soft: #e5f6ee;

  --font-display: "Bricolage Grotesque", system-ui, sans-serif;
  --font-body: "Inter", system-ui, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --radius-card: 10px;
  --radius-col: 14px;
  --shadow-card: 0 1px 2px rgba(25, 29, 39, 0.06), 0 2px 8px rgba(25, 29, 39, 0.05);
  --shadow-card-lift: 0 4px 10px rgba(25, 29, 39, 0.10), 0 10px 28px rgba(25, 29, 39, 0.10);
  --shadow-dialog: 0 12px 40px rgba(25, 29, 39, 0.18);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.mono { font-family: var(--font-mono); }


.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 28px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  position: sticky;
  top: 0;
  z-index: 20;
}

.brand { display: flex; align-items: center; gap: 10px; }

.brand-mark {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background:
    linear-gradient(135deg, var(--accent) 0%, #7b93ff 100%);
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  inset: 7px 6px;
  background:
    linear-gradient(to right,
      #fff 0 3px, transparent 3px 7px,
      #fff 7px 10px, transparent 10px 14px,
      #fff 14px 17px, transparent 17px);
  opacity: 0.95;
  border-radius: 1px;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
  margin: 0;
}

.header-actions { display: flex; align-items: center; gap: 16px; }

.board-stats {
  font-size: 0.78rem;
  color: var(--ink-soft);
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  padding: 5px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.board-stats:empty { display: none; }

.btn {
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: 8px;
  padding: 9px 16px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 140ms ease, border-color 140ms ease, transform 80ms ease;
}
.btn:active { transform: translateY(1px); }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

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

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border-color: var(--border-strong);
}
.btn-ghost:hover { background: var(--surface-sunken); }

.error-banner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin: 14px 28px 0;
  padding: 10px 14px;
  background: var(--danger-soft);
  border: 1px solid #f2c6c6;
  color: #8f2f2f;
  border-radius: 10px;
  font-size: 0.85rem;
}

.error-banner[hidden] { display: none; }

.error-dismiss {
  background: none;
  border: none;
  color: inherit;
  font-size: 1.1rem;
  cursor: pointer;
  line-height: 1;
  padding: 2px 6px;
}

.board {
  display: grid;
  grid-template-columns: repeat(4, minmax(250px, 1fr));
  gap: 18px;
  padding: 24px 28px 40px;
  align-items: start;
  max-width: 1400px;
  margin: 0 auto;
}

.column {
  background: var(--surface-sunken);
  border: 1px solid var(--border);
  border-radius: var(--radius-col);
  padding: 12px;
  display: flex;
  flex-direction: column;
  min-height: 200px;
}

.column-header {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 6px 12px;
}

.column-title {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.01em;
}

.column-count {
  margin-left: auto;
  font-size: 0.72rem;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  min-width: 22px;
  text-align: center;
  padding: 2px 7px;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex: none;
}
.column[data-status="todo"]        .status-dot { background: var(--status-todo); }
.column[data-status="in_progress"] .status-dot { background: var(--status-progress); }
.column[data-status="in_review"]   .status-dot { background: var(--status-review); }
.column[data-status="done"]        .status-dot { background: var(--status-done); }

.column-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  flex: 1;
  min-height: 60px;
  border-radius: 8px;
}

.board.is-dragging .column-list {
  outline: 1.5px dashed var(--border-strong);
  outline-offset: 3px;
  background: rgba(53, 86, 232, 0.035);
}

.task-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  padding: 12px 12px 10px;
  box-shadow: var(--shadow-card);
  cursor: grab;
  transition: box-shadow 140ms ease, border-color 140ms ease;
  position: relative;
  animation: card-in 200ms ease backwards;
}
.task-card:hover {
  box-shadow: var(--shadow-card-lift);
  border-color: var(--border-strong);
}
.task-card:active { cursor: grabbing; }

@keyframes card-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: none; }
}

.task-card.sortable-ghost {
  opacity: 0.4;
  border-style: dashed;
  border-color: var(--accent);
  box-shadow: none;
}
.task-card.sortable-drag { box-shadow: var(--shadow-card-lift); }

.task-card.sortable-ghost,
.task-card.sortable-drag { animation: none; }

.column[data-status="done"] .task-title {
  color: var(--ink-soft);
  text-decoration: line-through;
  text-decoration-color: var(--ink-faint);
}

.task-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 20px 4px 0;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.task-desc {
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin: 0 0 8px;
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.task-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-sunken);
  color: var(--ink-soft);
}
.chip::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ink-faint);
}
.chip.priority-high   { background: var(--danger-soft); color: #a03535; border-color: #f0cccc; }
.chip.priority-high::before { background: var(--danger); }
.chip.priority-low::before  { background: var(--status-done); }

.due-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 2px 8px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-sunken);
  color: var(--ink-soft);
}
.due-badge.overdue  { background: var(--danger-soft); color: #a03535; border-color: #f0cccc; }
.due-badge.due-soon { background: var(--warn-soft); color: #93650f; border-color: #eed7a8; }

.task-delete {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 22px;
  height: 22px;
  border-radius: 6px;
  border: none;
  background: transparent;
  color: var(--ink-faint);
  font-size: 0.95rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 120ms ease, background-color 120ms ease;
}
.task-card:hover .task-delete,
.task-delete:focus-visible { opacity: 1; }
.task-delete:hover { background: var(--danger-soft); color: var(--danger); }

.empty-state {
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-card);
  padding: 22px 12px;
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-faint);
}

.skeleton-card {
  border-radius: var(--radius-card);
  height: 74px;
  background: linear-gradient(
    100deg,
    var(--surface) 40%,
    #f2f4f8 50%,
    var(--surface) 60%
  );
  background-size: 200% 100%;
  animation: shimmer 1.3s ease-in-out infinite;
  border: 1px solid var(--border);
}
@keyframes shimmer {
  to { background-position: -200% 0; }
}

.task-dialog {
  border: none;
  border-radius: 16px;
  padding: 0;
  width: min(440px, calc(100vw - 32px));
  box-shadow: var(--shadow-dialog);
}
.task-dialog::backdrop {
  background: rgba(25, 29, 39, 0.4);
  backdrop-filter: blur(2px);
}

.task-dialog[open] {
  animation: dialog-in 180ms cubic-bezier(0.2, 0.8, 0.3, 1);
}
.task-dialog[open]::backdrop {
  animation: backdrop-in 180ms ease;
}
@keyframes dialog-in {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to   { opacity: 1; transform: none; }
}
@keyframes backdrop-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.task-dialog form { padding: 22px 22px 18px; }

.dialog-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0 0 16px;
}

.field { display: block; margin-bottom: 14px; }
.field-row { display: flex; gap: 12px; }
.field-row .field { flex: 1; }

.field-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-soft);
  margin-bottom: 5px;
}
.required { color: var(--danger); }

.field input,
.field textarea,
.field select {
  width: 100%;
  font-family: var(--font-body);
  font-size: 0.875rem;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 9px 11px;
  transition: border-color 120ms ease, box-shadow 120ms ease;
}
.field textarea { resize: vertical; }
.field input:focus,
.field textarea:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 6px;
}

.task-detail { width: min(480px, calc(100vw - 32px)); }

.detail-inner { padding: 22px 22px 18px; }

.detail-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
}
.detail-header .dialog-title {
  margin-bottom: 6px;
  overflow-wrap: anywhere;
}

.detail-close {
  flex: none;
  width: 26px;
  height: 26px;
  border: none;
  border-radius: 6px;
  background: transparent;
  color: var(--ink-faint);
  font-size: 1.05rem;
  line-height: 1;
  cursor: pointer;
}
.detail-close:hover { background: var(--surface-sunken); color: var(--ink); }

.detail-desc {
  margin: 0 0 10px;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--ink-soft);
}

.activity-heading {
  margin: 18px 0 10px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.activity-list {
  font-size: 0.82rem;
  color: var(--ink-soft);
  max-height: 240px;
  overflow-y: auto;
}

.activity-item {
  position: relative;
  margin-left: 4px;
  padding: 0 0 14px 16px;
  border-left: 2px solid var(--border);
  color: var(--ink);
}
.activity-item:last-child {
  border-left-color: transparent;
  padding-bottom: 2px;
}
.activity-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 3px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--status-progress);
  box-shadow: 0 0 0 2px var(--surface);
}
.activity-item[data-action="created"]::before { background: var(--status-done); }

.activity-text { line-height: 1.4; }

.activity-time {
  display: block;
  margin-top: 2px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--ink-faint);
}


@media (max-width: 1080px) {
  .board { grid-template-columns: repeat(2, minmax(250px, 1fr)); }
}

@media (max-width: 640px) {
  .app-header { padding: 14px 16px; }
  .board {
    grid-template-columns: 1fr;
    padding: 16px 16px 32px;
  }
  .board-stats { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}