/* ============================================================
   FlowSync PM - Kanban Board Stylesheet
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
  --primary: #6366F1;
  --primary-dark: #4F46E5;
  --primary-light: #818CF8;
  --accent: #06B6D4;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --bg-dark: #0F172A;
  --bg-app: #0D1424;
  --bg-card: #1E293B;
  --bg-card-hover: #263348;
  --bg-col: #162033;
  --border: #2D3F57;
  --border-light: #3D5068;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --gradient-primary: linear-gradient(135deg, #6366F1, #06B6D4);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.4);
  --shadow-drag: 0 12px 40px rgba(0,0,0,0.6);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

[data-theme="light"] {
  --bg-dark: #F8FAFC;
  --bg-app: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-card-hover: #F8FAFC;
  --bg-col: #EEF2FF;
  --border: #E2E8F0;
  --border-light: #CBD5E1;
  --text-primary: #0F172A;
  --text-secondary: #475569;
  --text-muted: #94A3B8;
  --shadow-card: 0 2px 8px rgba(0,0,0,0.08);
  --shadow-drag: 0 12px 40px rgba(0,0,0,0.15);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
  font-family: var(--font);
  background: var(--bg-app);
  color: var(--text-primary);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; font-family: var(--font); }

/* ── App Header ── */
.app-header {
  background: var(--bg-dark);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 16px; }
.header-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 16px;
  font-weight: 800;
  white-space: nowrap;
}
.logo-icon {
  width: 28px;
  height: 28px;
  background: var(--gradient-primary);
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}
.header-divider {
  width: 1px;
  height: 24px;
  background: var(--border);
}
.project-selector {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  transition: var(--transition);
}
.project-selector:hover {
  border-color: var(--primary);
  background: var(--bg-card-hover);
}
.project-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient-primary);
}

.header-center { display: flex; align-items: center; gap: 8px; flex: 1; max-width: 380px; margin: 0 20px; }
.search-bar {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 6px 12px;
  transition: var(--transition);
}
.search-bar:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.search-icon { color: var(--text-muted); font-size: 14px; flex-shrink: 0; }
.search-input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 14px;
  color: var(--text-primary);
  font-family: var(--font);
}
.search-input::placeholder { color: var(--text-muted); }
.filter-btn {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition);
  white-space: nowrap;
}
.filter-btn:hover, .filter-btn.active {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(99,102,241,0.1);
}

.header-right { display: flex; align-items: center; gap: 8px; }
.header-btn {
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 600;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 6px;
}
.header-btn-primary {
  background: var(--gradient-primary);
  color: #fff;
}
.header-btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }
.header-btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
}
.header-btn-ghost:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-color: var(--border-light);
}
.theme-toggle-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.theme-toggle-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}
.back-link {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  color: var(--text-muted);
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  border: 1px solid transparent;
}
.back-link:hover {
  color: var(--text-primary);
  background: var(--bg-card);
  border-color: var(--border);
}

/* ── Sub-header / Board Toolbar ── */
.board-toolbar {
  background: var(--bg-dark);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
}
.board-title {
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}
.board-actions { display: flex; gap: 8px; align-items: center; }
.view-toggle {
  display: flex;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}
.view-btn {
  padding: 5px 12px;
  font-size: 12px;
  font-weight: 600;
  background: transparent;
  border: none;
  color: var(--text-muted);
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 5px;
}
.view-btn.active {
  background: var(--primary);
  color: #fff;
}

/* ── Board Layout ── */
.board-container {
  flex: 1;
  overflow-x: auto;
  overflow-y: hidden;
  padding: 20px 24px;
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

/* Custom scrollbar for board */
.board-container::-webkit-scrollbar { height: 6px; }
.board-container::-webkit-scrollbar-track { background: var(--bg-app); }
.board-container::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.board-container::-webkit-scrollbar-thumb:hover { background: var(--border-light); }

/* ── Column ── */
.kanban-col {
  width: 280px;
  min-width: 280px;
  background: var(--bg-col);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 172px);
  transition: var(--transition);
  flex-shrink: 0;
}
.kanban-col.drag-over {
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(99,102,241,0.2);
  background: rgba(99,102,241,0.05);
}
.col-header {
  padding: 14px 16px 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.col-header-left { display: flex; align-items: center; gap: 8px; }
.col-indicator {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}
.col-title-text {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.col-count {
  background: rgba(99,102,241,0.2);
  color: var(--primary-light);
  border-radius: 100px;
  padding: 2px 8px;
  font-size: 11px;
  font-weight: 700;
}
.col-header-right { display: flex; align-items: center; gap: 4px; }
.col-menu-btn {
  width: 26px;
  height: 26px;
  border-radius: 6px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.col-menu-btn:hover {
  background: var(--bg-card);
  color: var(--text-primary);
}
.col-cards {
  flex: 1;
  overflow-y: auto;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 60px;
}
.col-cards::-webkit-scrollbar { width: 3px; }
.col-cards::-webkit-scrollbar-track { background: transparent; }
.col-cards::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
.col-footer {
  padding: 8px 12px 12px;
  flex-shrink: 0;
}
.add-card-btn {
  width: 100%;
  padding: 8px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: var(--transition);
}
.add-card-btn:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(99,102,241,0.06);
}

/* ── Kanban Card ── */
.kanban-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px;
  cursor: grab;
  transition: var(--transition);
  position: relative;
  user-select: none;
}
.kanban-card:hover {
  border-color: var(--border-light);
  box-shadow: var(--shadow-card);
  transform: translateY(-1px);
}
.kanban-card.dragging {
  opacity: 0.4;
  cursor: grabbing;
  transform: scale(0.98);
}
.kanban-card.drag-placeholder {
  border: 2px dashed var(--primary);
  background: rgba(99,102,241,0.05);
  opacity: 1;
  cursor: default;
}
.card-priority-bar {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
}
.card-priority-bar.high { background: var(--danger); }
.card-priority-bar.medium { background: var(--warning); }
.card-priority-bar.low { background: var(--success); }
.card-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 8px;
  margin-top: 4px;
}
.card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
  flex: 1;
  margin-right: 8px;
}
.card-actions {
  display: flex;
  gap: 2px;
  opacity: 0;
  transition: var(--transition);
  flex-shrink: 0;
}
.kanban-card:hover .card-actions { opacity: 1; }
.card-action-btn {
  width: 24px;
  height: 24px;
  border-radius: 5px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.card-action-btn:hover { background: var(--bg-col); color: var(--text-primary); }
.card-action-btn.delete:hover { background: rgba(239,68,68,0.15); color: var(--danger); }
.card-desc {
  font-size: 12px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  margin-bottom: 10px;
}
.card-tag {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.tag-feature { background: rgba(99,102,241,0.2); color: var(--primary-light); }
.tag-bug { background: rgba(239,68,68,0.2); color: #FCA5A5; }
.tag-design { background: rgba(139,92,246,0.2); color: #C4B5FD; }
.tag-backend { background: rgba(6,182,212,0.2); color: var(--accent); }
.tag-frontend { background: rgba(16,185,129,0.2); color: #6EE7B7; }
.tag-docs { background: rgba(245,158,11,0.2); color: #FCD34D; }
.card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
}
.card-assignee {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  position: relative;
}
.card-assignee[title]:hover::after {
  content: attr(title);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-dark);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 4px 8px;
  border-radius: 5px;
  font-size: 11px;
  white-space: nowrap;
  z-index: 10;
}
.card-due {
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 4px;
}
.card-due.overdue { color: var(--danger); }
.card-due.soon { color: var(--warning); }
.card-priority-badge {
  font-size: 10px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 100px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ── Add Column Button ── */
.add-col-btn {
  width: 260px;
  min-width: 260px;
  height: 60px;
  border-radius: var(--radius-lg);
  background: transparent;
  border: 2px dashed var(--border);
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: var(--transition);
  flex-shrink: 0;
  margin-top: 0;
  align-self: flex-start;
}
.add-col-btn:hover {
  border-color: var(--primary);
  color: var(--primary-light);
  background: rgba(99,102,241,0.05);
}

/* ── Modals ── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.2s;
  pointer-events: none;
}
.modal-overlay.open {
  opacity: 1;
  pointer-events: all;
}
.modal {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 520px;
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  transform: scale(0.96) translateY(8px);
  transition: transform 0.2s cubic-bezier(0.4,0,0.2,1), opacity 0.2s;
}
.modal-overlay.open .modal {
  transform: scale(1) translateY(0);
}
.modal-header {
  padding: 24px 24px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.modal-title {
  font-size: 18px;
  font-weight: 700;
}
.modal-close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}
.modal-close:hover { background: var(--bg-col); color: var(--text-primary); }
.modal-body { padding: 0 24px 24px; }
.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input, .form-textarea, .form-select {
  width: 100%;
  background: var(--bg-col);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 14px;
  color: var(--text-primary);
  font-family: var(--font);
  outline: none;
  transition: var(--transition);
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}
.form-textarea { resize: vertical; min-height: 80px; line-height: 1.6; }
.form-select option { background: var(--bg-card); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-footer {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  padding-top: 4px;
}
.btn-cancel {
  padding: 9px 20px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-cancel:hover { background: var(--bg-col); color: var(--text-primary); }
.btn-save {
  padding: 9px 24px;
  border-radius: var(--radius-sm);
  background: var(--gradient-primary);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
  box-shadow: 0 2px 8px rgba(99,102,241,0.3);
}
.btn-save:hover { opacity: 0.9; transform: translateY(-1px); }

/* ── Tags Selector ── */
.tags-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.tag-option {
  padding: 4px 10px;
  border-radius: 100px;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  opacity: 0.6;
}
.tag-option.selected { opacity: 1; border-color: currentColor; }

/* ── Assignee Selector ── */
.assignee-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
}
.assignee-option {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 8px 4px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
}
.assignee-option:hover { background: var(--bg-col); }
.assignee-option.selected { border-color: var(--primary); background: rgba(99,102,241,0.1); }
.assignee-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
}
.assignee-name {
  font-size: 10px;
  font-weight: 600;
  color: var(--text-muted);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  width: 100%;
}

/* ── Confirm Delete Modal ── */
.modal-sm { max-width: 380px; }
.confirm-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(239,68,68,0.1);
  border: 1px solid rgba(239,68,68,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin: 0 auto 16px;
}
.confirm-text {
  text-align: center;
  margin-bottom: 24px;
}
.confirm-text h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.confirm-text p { font-size: 14px; color: var(--text-secondary); }
.btn-danger {
  padding: 9px 24px;
  border-radius: var(--radius-sm);
  background: var(--danger);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  transition: var(--transition);
}
.btn-danger:hover { background: #DC2626; }

/* ── Toast Notifications ── */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.toast {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  max-width: 320px;
  transform: translateX(120%);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  font-size: 14px;
  font-weight: 500;
}
.toast.show { transform: translateX(0); }
.toast-icon { font-size: 18px; flex-shrink: 0; }
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.info { border-left: 3px solid var(--primary); }

/* ── Board Stats Bar ── */
.stats-bar {
  background: var(--bg-dark);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
  height: 40px;
  display: flex;
  align-items: center;
  gap: 24px;
  flex-shrink: 0;
  overflow-x: auto;
}
.stats-bar::-webkit-scrollbar { display: none; }
.stat-pill {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}
.stat-pill-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}
.stat-pill-val { color: var(--text-primary); }

/* ── Sprint selector ── */
.sprint-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  background: rgba(6,182,212,0.15);
  color: var(--accent);
  border: 1px solid rgba(6,182,212,0.2);
}

/* ── Empty State ── */
.empty-col {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
  gap: 8px;
  opacity: 0.7;
}
.empty-col-icon { font-size: 28px; opacity: 0.5; }

/* ── Responsive ── */
@media (max-width: 768px) {
  .header-center { display: none; }
  .app-header { padding: 0 16px; }
  .board-container { padding: 16px; }
  .kanban-col { width: 250px; min-width: 250px; }
  .stats-bar { display: none; }
  .board-toolbar { padding: 0 16px; }
}