/* ═══════════════════════════════════════════════════════════════════
   a›rival Kanban — CSS
   ═══════════════════════════════════════════════════════════════════ */

:root {
  --kb-bg: #f0f2f5;
  --kb-surface: #ffffff;
  --kb-border: #e1e4e8;
  --kb-text: #1a1a2e;
  --kb-text-secondary: #6b7280;
  --kb-primary: #2563eb;
  --kb-primary-hover: #1d4ed8;
  --kb-danger: #dc2626;
  --kb-danger-hover: #b91c1c;
  --kb-success: #16a34a;
  --kb-warning: #f59e0b;
  --kb-radius: 8px;
  --kb-radius-sm: 6px;
  --kb-shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --kb-shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --kb-column-width: 300px;
  --kb-topbar-height: 52px;
  --kb-transition: 150ms ease;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body, #root { height: 100%; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; color: var(--kb-text); background: var(--kb-bg); -webkit-font-smoothing: antialiased; }

/* ─── Loading / Login ────────────────────────────────────────────── */

.kb-loading {
  display: flex; align-items: center; justify-content: center;
  height: 100vh; gap: 12px; color: var(--kb-text-secondary); font-size: 15px;
}
.kb-spinner {
  width: 20px; height: 20px; border: 2px solid var(--kb-border);
  border-top-color: var(--kb-primary); border-radius: 50%;
  animation: kb-spin 0.6s linear infinite;
}
@keyframes kb-spin { to { transform: rotate(360deg); } }

.kb-login {
  display: flex; align-items: center; justify-content: center; height: 100vh;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 100%);
}
.kb-login-card {
  text-align: center; padding: 48px 40px; background: var(--kb-surface);
  border-radius: 16px; box-shadow: var(--kb-shadow-lg); max-width: 400px;
}
.kb-login-title { font-size: 28px; font-weight: 700; margin-bottom: 8px; }
.kb-login-subtitle { font-size: 14px; color: var(--kb-text-secondary); margin-bottom: 28px; line-height: 1.5; }

/* ─── Buttons ────────────────────────────────────────────────────── */

.kb-btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 8px 18px;
  font-size: 14px; font-weight: 500; border: none; border-radius: var(--kb-radius-sm);
  cursor: pointer; transition: background var(--kb-transition), opacity var(--kb-transition);
}
.kb-btn:disabled { opacity: 0.5; cursor: default; }
.kb-btn-primary { background: var(--kb-primary); color: #fff; }
.kb-btn-primary:hover:not(:disabled) { background: var(--kb-primary-hover); }
.kb-btn-danger { background: var(--kb-danger); color: #fff; }
.kb-btn-danger:hover:not(:disabled) { background: var(--kb-danger-hover); }
.kb-btn-ghost { background: transparent; color: var(--kb-text-secondary); }
.kb-btn-ghost:hover:not(:disabled) { background: rgba(0,0,0,0.06); color: var(--kb-text); }
.kb-btn-sm { padding: 4px 12px; font-size: 13px; }
.kb-btn-share { background: var(--kb-primary); color: #fff; border-radius: 20px; padding: 5px 16px; font-size: 13px; font-weight: 600; }
.kb-btn-share:hover { background: var(--kb-primary-hover); }

/* ─── Inputs ─────────────────────────────────────────────────────── */

.kb-input, .kb-select {
  width: 100%; padding: 8px 12px; font-size: 14px; border: 1px solid var(--kb-border);
  border-radius: var(--kb-radius-sm); background: var(--kb-surface); color: var(--kb-text);
  outline: none; transition: border-color var(--kb-transition);
}
.kb-input:focus, .kb-select:focus { border-color: var(--kb-primary); }
.kb-input-sm { padding: 5px 8px; font-size: 13px; }
.kb-label { display: block; font-size: 13px; font-weight: 600; margin: 12px 0 4px; color: var(--kb-text-secondary); }
.kb-error { color: var(--kb-danger); font-size: 13px; margin-top: 8px; }
.kb-success { color: var(--kb-success); font-size: 13px; margin-top: 8px; }

/* ─── App layout ─────────────────────────────────────────────────── */

.kb-app { display: flex; flex-direction: column; height: 100vh; }
.kb-app-board { overflow: hidden; }

/* ─── Doc list header ────────────────────────────────────────────── */

.kb-header {
  display: flex; align-items: center; gap: 12px; padding: 12px 24px;
  background: var(--kb-surface); border-bottom: 1px solid var(--kb-border);
}
.kb-header-back {
  display: flex; align-items: center; color: var(--kb-text-secondary);
  text-decoration: none; transition: color var(--kb-transition);
}
.kb-header-back:hover { color: var(--kb-text); }
.kb-header-title { font-size: 18px; font-weight: 600; }

/* ─── Doc list ───────────────────────────────────────────────────── */

.kb-doc-list { flex: 1; padding: 32px 24px; overflow-y: auto; }
.kb-doc-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px; max-width: 1200px; margin: 0 auto;
}
.kb-doc-card {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 10px; padding: 28px 20px; background: var(--kb-surface);
  border: 1px solid var(--kb-border); border-radius: var(--kb-radius);
  cursor: pointer; transition: box-shadow var(--kb-transition), transform var(--kb-transition);
  text-align: center; min-height: 140px;
}
.kb-doc-card:hover { box-shadow: var(--kb-shadow-lg); transform: translateY(-2px); }
.kb-doc-card-new { border-style: dashed; border-color: var(--kb-primary); color: var(--kb-primary); }
.kb-doc-card-new:hover { background: #f0f4ff; }
.kb-doc-card-icon { color: var(--kb-text-secondary); }
.kb-doc-card-title { font-size: 14px; font-weight: 600; word-break: break-word; }
.kb-doc-card-meta { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--kb-text-secondary); }

.kb-shared-badge {
  display: inline-flex; align-items: center; font-size: 10.5px; font-weight: 600;
  padding: 1px 7px; border-radius: 8px; background: rgba(37,99,235,0.1); color: var(--kb-primary); white-space: nowrap;
}
.kb-shared-badge--view { background: rgba(245,158,11,0.1); color: #b45309; }

/* ─── Top bar (board view) ───────────────────────────────────────── */

.kb-topbar {
  display: flex; align-items: center; gap: 10px; padding: 0 16px;
  height: var(--kb-topbar-height); background: var(--kb-surface);
  border-bottom: 1px solid var(--kb-border); flex-shrink: 0;
}
.kb-topbar-back {
  display: flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border: none; background: transparent;
  border-radius: var(--kb-radius-sm); cursor: pointer; color: var(--kb-text-secondary);
  transition: background var(--kb-transition);
}
.kb-topbar-back:hover { background: rgba(0,0,0,0.06); }
.kb-topbar-title {
  font-size: 16px; font-weight: 600; border: none; background: transparent;
  outline: none; padding: 4px 8px; border-radius: var(--kb-radius-sm);
  min-width: 150px; max-width: 300px; color: var(--kb-text);
}
.kb-topbar-title:focus { background: rgba(0,0,0,0.04); }

/* Filters */
.kb-topbar-filters {
  display: flex; align-items: center; gap: 4px;
  padding: 0 8px; overflow-x: auto;
}
.kb-filter-btn {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 10px; font-size: 12px; font-weight: 500; border: 1px solid var(--kb-border);
  border-radius: 16px; background: transparent; color: var(--kb-text-secondary);
  cursor: pointer; white-space: nowrap; transition: all var(--kb-transition);
}
.kb-filter-btn:hover { border-color: var(--kb-primary); color: var(--kb-primary); }
.kb-filter-btn--active { background: var(--kb-primary); color: #fff; border-color: var(--kb-primary); }
.kb-filter-dot { width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }

/* Connection dot */
.kb-connection-dot {
  width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0;
}
.kb-connection-dot[data-status="connected"] { background: var(--kb-success); }
.kb-connection-dot[data-status="connecting"] { background: var(--kb-warning); }
.kb-connection-dot[data-status="disconnected"] { background: var(--kb-danger); }

/* ─── Board ──────────────────────────────────────────────────────── */

.kb-board {
  flex: 1; overflow: hidden; padding: 16px 0 16px 16px;
}
.kb-board-scroll {
  display: flex; gap: 12px; height: 100%; overflow-x: auto; overflow-y: hidden;
  padding-right: 16px; padding-bottom: 8px;
  scroll-behavior: smooth;
}
.kb-board-scroll::-webkit-scrollbar { height: 8px; }
.kb-board-scroll::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.15); border-radius: 4px; }

/* ─── Column ─────────────────────────────────────────────────────── */

.kb-column-wrapper {
  flex-shrink: 0; width: var(--kb-column-width); transition: opacity var(--kb-transition);
}
.kb-column-wrapper--drag-over { opacity: 0.7; }
.kb-column-wrapper[draggable="true"] { cursor: grab; }

.kb-column {
  display: flex; flex-direction: column; max-height: 100%;
  background: var(--kb-surface); border-radius: var(--kb-radius);
  box-shadow: var(--kb-shadow); overflow: hidden;
}
.kb-column--collapsed .kb-column-cards,
.kb-column--collapsed .kb-column-footer { display: none; }
.kb-column--collapsed { max-height: auto; }

.kb-column--wip-at-limit .kb-column-header { background: rgba(245,158,11,0.08); }
.kb-column--wip-exceeded .kb-column-header { background: rgba(220,38,38,0.08); }
.kb-column--wip-exceeded .kb-column-count { color: var(--kb-danger); font-weight: 700; }

.kb-column-header {
  display: flex; align-items: center; gap: 8px; padding: 12px 12px 8px;
  border-top: 3px solid #e3e8ef; flex-shrink: 0;
}
.kb-column-title {
  font-size: 13px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.5px; flex: 1; min-width: 0;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  cursor: default;
}
.kb-column-title-input {
  font-size: 13px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.5px; flex: 1; min-width: 0;
  border: 1px solid var(--kb-primary); border-radius: 4px;
  padding: 2px 6px; outline: none; background: var(--kb-surface);
}
.kb-column-count {
  font-size: 12px; font-weight: 600; color: var(--kb-text-secondary);
  background: rgba(0,0,0,0.06); padding: 1px 8px; border-radius: 10px; white-space: nowrap;
}

.kb-column-menu-wrapper { position: relative; }
.kb-column-menu-btn {
  display: flex; align-items: center; justify-content: center;
  width: 24px; height: 24px; border: none; background: transparent;
  border-radius: 4px; cursor: pointer; color: var(--kb-text-secondary);
  transition: background var(--kb-transition);
}
.kb-column-menu-btn:hover { background: rgba(0,0,0,0.08); }

.kb-column-menu {
  position: absolute; top: 100%; right: 0; z-index: 20;
  background: var(--kb-surface); border: 1px solid var(--kb-border);
  border-radius: var(--kb-radius-sm); box-shadow: var(--kb-shadow-lg);
  min-width: 160px; padding: 4px 0;
}
.kb-column-menu button {
  display: block; width: 100%; padding: 8px 14px; text-align: left;
  font-size: 13px; border: none; background: transparent; cursor: pointer;
  color: var(--kb-text); transition: background var(--kb-transition);
}
.kb-column-menu button:hover { background: rgba(0,0,0,0.04); }
.kb-column-menu-danger { color: var(--kb-danger) !important; }

/* ─── Column cards area ──────────────────────────────────────────── */

.kb-column-cards {
  flex: 1; overflow-y: auto; padding: 4px 8px;
  min-height: 40px;
}
.kb-column-cards::-webkit-scrollbar { width: 4px; }
.kb-column-cards::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.12); border-radius: 2px; }

.kb-card-drop-zone { position: relative; }
.kb-card-drop-zone--active::before {
  content: ""; position: absolute; top: -2px; left: 4px; right: 4px;
  height: 3px; background: var(--kb-primary); border-radius: 2px; z-index: 5;
}
.kb-card-drop-zone--bottom { min-height: 20px; flex-shrink: 0; }
.kb-card-drop-zone--bottom.kb-card-drop-zone--active::before { top: auto; bottom: 0; }

/* ─── Card ───────────────────────────────────────────────────────── */

.kb-card {
  background: var(--kb-surface); border: 1px solid var(--kb-border);
  border-radius: var(--kb-radius-sm); padding: 10px 12px;
  margin-bottom: 6px; cursor: pointer;
  transition: box-shadow var(--kb-transition), transform var(--kb-transition), opacity var(--kb-transition);
  outline: none;
}
.kb-card:hover { box-shadow: 0 2px 8px rgba(0,0,0,0.1); }
.kb-card:focus-visible { box-shadow: 0 0 0 2px var(--kb-primary); }
.kb-card--dragging { opacity: 0.4; transform: rotate(2deg); }
.kb-card[draggable="true"] { cursor: grab; }
.kb-card[draggable="true"]:active { cursor: grabbing; }

.kb-card-labels { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 6px; }
.kb-card-label {
  display: inline-block; padding: 1px 8px; font-size: 10.5px; font-weight: 600;
  color: #fff; border-radius: 3px; line-height: 18px;
}

.kb-card-title { font-size: 14px; font-weight: 500; line-height: 1.4; word-break: break-word; }

.kb-card-badges {
  display: flex; flex-wrap: wrap; gap: 8px; margin-top: 8px;
}
.kb-card-badge {
  display: inline-flex; align-items: center; gap: 3px;
  font-size: 11px; color: var(--kb-text-secondary);
}
.kb-card-badge--done { color: var(--kb-success); }
.kb-card-badge--due { color: var(--kb-text-secondary); }
.kb-card-badge--overdue { color: var(--kb-danger); font-weight: 600; }

/* ─── Add card / column ──────────────────────────────────────────── */

.kb-column-footer { padding: 4px 8px 8px; }

.kb-add-card-btn {
  display: flex; align-items: center; gap: 6px; width: 100%;
  padding: 8px 10px; font-size: 13px; color: var(--kb-text-secondary);
  border: none; background: transparent; border-radius: var(--kb-radius-sm);
  cursor: pointer; transition: background var(--kb-transition), color var(--kb-transition);
}
.kb-add-card-btn:hover { background: rgba(0,0,0,0.06); color: var(--kb-text); }

.kb-add-card-form { display: flex; flex-direction: column; gap: 6px; }
.kb-add-card-input {
  width: 100%; padding: 8px 10px; font-size: 14px; border: 1px solid var(--kb-primary);
  border-radius: var(--kb-radius-sm); outline: none; resize: none;
  font-family: inherit;
}
.kb-add-card-actions { display: flex; gap: 6px; }

.kb-add-column-btn {
  display: flex; align-items: center; gap: 6px; flex-shrink: 0;
  padding: 12px 20px; font-size: 13px; font-weight: 500; height: fit-content;
  background: rgba(0,0,0,0.04); color: var(--kb-text-secondary);
  border: 2px dashed var(--kb-border); border-radius: var(--kb-radius);
  cursor: pointer; white-space: nowrap;
  transition: background var(--kb-transition), border-color var(--kb-transition), color var(--kb-transition);
  min-width: 180px;
}
.kb-add-column-btn:hover { background: rgba(37,99,235,0.06); border-color: var(--kb-primary); color: var(--kb-primary); }

/* ─── Overlay / Dialog ───────────────────────────────────────────── */

.kb-overlay {
  position: fixed; inset: 0; z-index: 100; background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(2px);
}
.kb-dialog {
  background: var(--kb-surface); border-radius: 12px; box-shadow: var(--kb-shadow-lg);
  width: 440px; max-width: 95vw; max-height: 90vh; overflow-y: auto;
}
.kb-dialog-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--kb-border);
}
.kb-dialog-title { font-size: 16px; font-weight: 600; }
.kb-dialog-close {
  display: flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border: none; background: transparent;
  font-size: 20px; color: var(--kb-text-secondary); cursor: pointer;
  border-radius: 4px; transition: background var(--kb-transition);
}
.kb-dialog-close:hover { background: rgba(0,0,0,0.08); }
.kb-dialog-body { padding: 16px 20px; }
.kb-dialog-footer {
  display: flex; justify-content: flex-end; gap: 8px;
  padding: 12px 20px; border-top: 1px solid var(--kb-border);
}

/* ─── Card Dialog ────────────────────────────────────────────────── */

.kb-card-dialog {
  background: var(--kb-surface); border-radius: 12px; box-shadow: var(--kb-shadow-lg);
  width: 720px; max-width: 95vw; max-height: 90vh; overflow-y: auto;
  position: relative; padding: 24px;
}

.kb-cd-section { margin-bottom: 16px; }
.kb-cd-title {
  width: 100%; font-size: 20px; font-weight: 700; border: none; background: transparent;
  outline: none; padding: 4px 0; color: var(--kb-text);
  border-bottom: 2px solid transparent; transition: border-color var(--kb-transition);
}
.kb-cd-title:focus { border-bottom-color: var(--kb-primary); }
.kb-cd-title-ro { font-size: 20px; font-weight: 700; }

.kb-cd-body { display: flex; gap: 24px; }
.kb-cd-main { flex: 1; min-width: 0; }
.kb-cd-sidebar { width: 200px; flex-shrink: 0; }

.kb-cd-labels { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 12px; }
.kb-cd-label {
  display: inline-block; padding: 2px 10px; font-size: 12px; font-weight: 600;
  color: #fff; border-radius: 4px; line-height: 20px;
}

.kb-cd-field { margin-bottom: 16px; }
.kb-cd-field-label { font-size: 12px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; color: var(--kb-text-secondary); margin-bottom: 6px; display: block; }
.kb-cd-field-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 6px; }

.kb-cd-description {
  width: 100%; padding: 10px 12px; font-size: 14px; border: 1px solid var(--kb-border);
  border-radius: var(--kb-radius-sm); outline: none; resize: vertical;
  font-family: inherit; min-height: 80px; line-height: 1.5;
  transition: border-color var(--kb-transition);
}
.kb-cd-description:focus { border-color: var(--kb-primary); }
.kb-cd-description-ro { font-size: 14px; color: var(--kb-text-secondary); line-height: 1.5; white-space: pre-wrap; }

/* Checklist */
.kb-cd-check-progress { font-size: 12px; color: var(--kb-text-secondary); font-weight: 600; }
.kb-cd-progress-bar {
  height: 4px; background: rgba(0,0,0,0.08); border-radius: 2px; margin-bottom: 8px; overflow: hidden;
}
.kb-cd-progress-fill { height: 100%; background: var(--kb-success); border-radius: 2px; transition: width 0.3s ease; }

.kb-cd-checklist { display: flex; flex-direction: column; gap: 4px; margin-bottom: 8px; }
.kb-cd-check-item {
  display: flex; align-items: center; gap: 8px; padding: 4px 0; font-size: 14px;
}
.kb-cd-check-item input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--kb-primary); cursor: pointer; }
.kb-cd-check-text--done { text-decoration: line-through; color: var(--kb-text-secondary); }
.kb-cd-check-remove {
  margin-left: auto; border: none; background: transparent;
  font-size: 16px; color: var(--kb-text-secondary); cursor: pointer; padding: 0 4px;
  opacity: 0; transition: opacity var(--kb-transition);
}
.kb-cd-check-item:hover .kb-cd-check-remove { opacity: 1; }
.kb-cd-check-add { display: flex; gap: 6px; }

/* Labels sidebar */
.kb-cd-label-list { display: flex; flex-direction: column; gap: 4px; margin-bottom: 8px; }
.kb-cd-label-toggle {
  display: flex; align-items: center; justify-content: space-between;
  padding: 4px 10px; font-size: 12px; font-weight: 600; color: #fff;
  border: 2px solid transparent; border-radius: 4px; cursor: pointer;
  transition: opacity var(--kb-transition);
  min-height: 28px;
}
.kb-cd-label-toggle:hover { opacity: 0.85; }
.kb-cd-label-toggle--active { border-color: rgba(0,0,0,0.3); }
.kb-cd-label-check { font-size: 13px; }

.kb-cd-new-label { display: flex; flex-direction: column; gap: 6px; margin-top: 6px; }
.kb-cd-color-picker { display: flex; flex-wrap: wrap; gap: 4px; }
.kb-cd-color-swatch {
  width: 24px; height: 24px; border-radius: 4px; border: 2px solid transparent;
  cursor: pointer; transition: transform var(--kb-transition);
}
.kb-cd-color-swatch:hover { transform: scale(1.15); }
.kb-cd-color-swatch--active { border-color: var(--kb-text); }

.kb-cd-meta { font-size: 11px; color: var(--kb-text-secondary); margin-top: 12px; }

/* ─── Responsive ─────────────────────────────────────────────────── */

@media (max-width: 768px) {
  :root { --kb-column-width: 260px; }
  .kb-cd-body { flex-direction: column; }
  .kb-cd-sidebar { width: 100%; }
  .kb-card-dialog { width: 95vw; padding: 16px; }
  .kb-topbar-filters { max-width: 150px; }
}

@media (max-width: 480px) {
  :root { --kb-column-width: 85vw; }
  .kb-doc-grid { grid-template-columns: 1fr; }
  .kb-topbar { padding: 0 8px; gap: 6px; }
  .kb-topbar-title { font-size: 14px; min-width: 100px; }
}