:root {
  --bg: #f4f6fb;
  --bg-soft: #ffffff;
  --surface: #ffffff;
  --surface-2: #f8f9ff;
  --border: #e6e9f2;
  --text: #1f2430;
  --text-soft: #6b7280;
  --primary: #6366f1;
  --primary-strong: #4f46e5;
  --primary-soft: rgba(99, 102, 241, 0.12);
  --accent: #22d3ee;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
  --shadow-lg: 0 8px 30px rgba(16, 24, 40, 0.14);
  --radius: 14px;
  --radius-sm: 10px;
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-soft: #151824;
  --surface: #1b1f2d;
  --surface-2: #232838;
  --border: #2a3042;
  --text: #eef0f6;
  --text-soft: #9aa3b5;
  --primary-soft: rgba(129, 140, 248, 0.16);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  background-image:
    radial-gradient(60rem 60rem at 110% -10%, rgba(99, 102, 241, 0.16), transparent 60%),
    radial-gradient(50rem 50rem at -20% 110%, rgba(34, 211, 238, 0.14), transparent 60%);
  background-attachment: fixed;
  transition: background 0.3s, color 0.3s;
}

.app { max-width: 1440px; margin: 0 auto; padding: 0 24px 40px; }

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 20px 0 16px;
  position: sticky;
  top: 0;
  z-index: 50;
  background: linear-gradient(180deg, var(--bg) 70%, transparent);
  backdrop-filter: blur(8px);
}

.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  width: 44px; height: 44px;
  display: grid; place-items: center;
  font-size: 24px; color: #fff;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(99, 102, 241, 0.35);
}
.brand-text h1 { font-size: 20px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; }
.brand-text span { font-size: 12px; color: var(--text-soft); }

.tabs {
  display: flex;
  gap: 4px;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 4px;
  border-radius: 12px;
  margin-left: 8px;
  box-shadow: var(--shadow);
}
.tab {
  display: flex; align-items: center; gap: 8px;
  border: none; background: transparent; color: var(--text-soft);
  font-family: inherit; font-size: 14px; font-weight: 600;
  padding: 8px 16px; border-radius: 9px; cursor: pointer;
  transition: all 0.2s;
}
.tab:hover { color: var(--text); }
.tab.active { background: linear-gradient(135deg, var(--primary), var(--primary-strong)); color: #fff; box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3); }

.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.icon-btn {
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border: 1px solid var(--border); background: var(--surface); color: var(--text-soft);
  border-radius: 10px; cursor: pointer; font-size: 18px;
  transition: all 0.2s;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-soft); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  border: none; cursor: pointer;
  font-family: inherit; font-size: 14px; font-weight: 600;
  padding: 10px 16px; border-radius: 10px;
  transition: all 0.2s;
}
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-strong)); color: #fff; box-shadow: 0 4px 14px rgba(79, 70, 229, 0.3); }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 18px rgba(79, 70, 229, 0.4); }
.btn-ghost { background: transparent; color: var(--text-soft); border: 1px solid var(--border); }
.btn-ghost:hover { color: var(--text); background: var(--surface-2); }
.btn-danger { background: linear-gradient(135deg, #f43f5e, #e11d48); color: #fff; box-shadow: 0 4px 14px rgba(225, 29, 72, 0.3); }
.btn-danger:hover { transform: translateY(-1px); }

.content { margin-top: 8px; }
.view { display: none; }
.view.active { display: block; animation: fadeUp 0.35s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }

/* ---------- Banner de vencidas ---------- */
.overdue-banner {
  display: flex; align-items: center; gap: 10px;
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.14), rgba(249, 115, 22, 0.12));
  border: 1px solid rgba(239, 68, 68, 0.3);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  margin-bottom: 16px;
  font-size: 13.5px;
  animation: fadeUp 0.3s ease;
}
.overdue-banner > i { font-size: 20px; color: var(--danger); animation: blinkAlert 1.2s infinite; }
.overdue-banner .icon-btn { margin-left: auto; width: 30px; height: 30px; }
.overdue-banner b { color: var(--danger); }
@keyframes blinkAlert { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

/* ---------- Tablero ---------- */
.board-toolbar {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 18px; flex-wrap: wrap;
}
.search-box {
  display: flex; align-items: center; gap: 8px;
  background: var(--surface); border: 1px solid var(--border);
  padding: 0 12px; border-radius: 10px; flex: 1; min-width: 220px;
  box-shadow: var(--shadow); color: var(--text-soft);
}
.search-box input { border: none; outline: none; background: transparent; color: var(--text); font-family: inherit; font-size: 14px; padding: 10px 0; width: 100%; }
.filter-group { display: flex; gap: 8px; align-items: center; }
.filter-group select {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  font-family: inherit; font-size: 14px; font-weight: 500;
  padding: 10px 12px; border-radius: 10px; cursor: pointer; outline: none;
  box-shadow: var(--shadow);
}
.board-actions { display: flex; gap: 8px; align-items: center; }
.board-actions .btn { box-shadow: var(--shadow); }

.board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  align-items: start;
}

.column {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
  min-height: 200px;
  transition: box-shadow 0.25s, transform 0.25s, background 0.3s;
}
.column.drag-over { box-shadow: var(--shadow-lg); transform: translateY(-2px); background: var(--surface-2); }

.column-header { display: flex; align-items: center; gap: 10px; padding: 2px 4px 14px; }
.column-dot { width: 10px; height: 10px; border-radius: 50%; }
.column-title { font-size: 15px; font-weight: 700; letter-spacing: -0.01em; }
.column-head-right { margin-left: auto; display: flex; align-items: center; gap: 6px; }
.column-count {
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text-soft); font-size: 12px; font-weight: 700;
  min-width: 26px; height: 26px; padding: 0 8px;
  display: grid; place-items: center; border-radius: 999px;
}
.column-tools { display: flex; gap: 2px; opacity: 0; transition: opacity 0.15s; }
.column:hover .column-tools { opacity: 1; }
.column-tools .mini-btn {
  width: 28px; height: 28px; display: grid; place-items: center;
  border: none; background: transparent; color: var(--text-soft);
  border-radius: 8px; cursor: pointer; font-size: 16px; transition: all 0.15s;
}
.column-tools .mini-btn:hover { background: var(--surface-2); color: var(--primary); }
.column-tools .mini-btn.col-delete:hover { color: var(--danger); background: rgba(239, 68, 68, 0.1); }
.column.todo .column-dot { background: #8b93a7; }
.column.inprogress .column-dot { background: var(--primary); box-shadow: 0 0 0 4px var(--primary-soft); animation: pulse 2s infinite; }
.column.done .column-dot { background: var(--success); }

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--primary-soft); }
  50% { box-shadow: 0 0 0 7px transparent; }
}

.cards { display: flex; flex-direction: column; gap: 12px; min-height: 60px; }

/* ---------- Tarjeta ---------- */
.task-card {
  background: color-mix(in srgb, var(--col, #8b93a7) 7%, var(--surface));
  border: 1px solid var(--border);
  border-left: 4px solid var(--col, #8b93a7);
  border-radius: var(--radius-sm);
  padding: 14px;
  cursor: grab;
  position: relative;
  transition: transform 0.15s, box-shadow 0.2s, border-color 0.2s, opacity 0.2s;
  box-shadow: 0 1px 2px rgba(16, 24, 40, 0.05);
  animation: popIn 0.25s ease;
}
@keyframes popIn { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: scale(1); } }
.task-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: var(--col, rgba(99, 102, 241, 0.4)); }
.task-card.dragging { opacity: 0.5; transform: rotate(2deg) scale(0.98); }
.task-card.overdue { border-left-color: var(--danger); background: color-mix(in srgb, #ef4444 7%, var(--surface)); }
.task-card.overdue .due-date { color: var(--danger); background: rgba(239, 68, 68, 0.12); }
.task-card.completed { opacity: 0.85; }
.task-card.completed .task-title { text-decoration: line-through; color: var(--text-soft); }

.task-card .priority-bar { position: absolute; top: 0; left: 0; right: 0; height: 4px; border-radius: 10px 10px 0 0; }
.priority-bar.high { background: linear-gradient(90deg, #ef4444, #f97316); }
.priority-bar.medium { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.priority-bar.low { background: linear-gradient(90deg, #10b981, #34d399); }

.task-title { font-size: 14px; font-weight: 600; line-height: 1.4; margin: 6px 0 4px; word-break: break-word; }
.task-desc { font-size: 12.5px; color: var(--text-soft); line-height: 1.5; margin-bottom: 10px; word-break: break-word; }

.task-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.badge {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 11.5px; font-weight: 600;
  padding: 4px 9px; border-radius: 999px;
}
.badge-priority { color: var(--text-soft); background: var(--surface-2); border: 1px solid var(--border); }
.badge-priority.high { color: var(--danger); background: rgba(239, 68, 68, 0.1); border-color: rgba(239, 68, 68, 0.2); }
.badge-priority.medium { color: #d97706; background: rgba(245, 158, 11, 0.12); border-color: rgba(245, 158, 11, 0.25); }
[data-theme="dark"] .badge-priority.medium { color: #fbbf24; }
.badge-priority.low { color: var(--success); background: rgba(16, 185, 129, 0.1); border-color: rgba(16, 185, 129, 0.25); }
.badge-tag { color: var(--primary); background: var(--primary-soft); }
.badge-overdue {
  color: #fff;
  background: linear-gradient(135deg, #ef4444, #f97316);
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.35);
  animation: pulseAlert 1.6s infinite;
}
@keyframes pulseAlert {
  0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.45); }
  50% { box-shadow: 0 0 0 6px rgba(239, 68, 68, 0); }
}
.due-date { font-size: 11.5px; font-weight: 600; color: var(--text-soft); display: inline-flex; align-items: center; gap: 4px; }
.due-date i { font-size: 13px; }

.task-actions {
  display: flex; align-items: center; justify-content: flex-end; gap: 4px;
  border-top: 1px solid var(--border); padding-top: 10px; margin-top: 2px;
}
.task-actions .mini-btn {
  width: 30px; height: 30px; display: grid; place-items: center;
  border: none; background: transparent; color: var(--text-soft);
  border-radius: 8px; cursor: pointer; font-size: 16px; transition: all 0.15s;
}
.task-actions .mini-btn:hover { background: var(--surface-2); color: var(--primary); }
.task-actions .mini-btn.delete:hover { color: var(--danger); background: rgba(239, 68, 68, 0.1); }

.add-card-btn {
  width: 100%; margin-top: 14px;
  display: flex; align-items: center; justify-content: center; gap: 6px;
  padding: 10px; border: 1.5px dashed var(--border); background: transparent;
  border-radius: var(--radius-sm); color: var(--text-soft); font-family: inherit;
  font-size: 13px; font-weight: 600; cursor: pointer; transition: all 0.2s;
}
.add-card-btn:hover { color: var(--primary); border-color: var(--primary); background: var(--primary-soft); }

.empty-column { padding: 30px 10px; text-align: center; color: var(--text-soft); font-size: 13px; }

/* ---------- KPIs ---------- */
.kpis-grid { display: grid; gap: 16px; }
.stats-cards { grid-template-columns: repeat(auto-fit, minmax(190px, 1fr)); margin-bottom: 16px; }
.stat-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px;
  box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 8px;
  position: relative; overflow: hidden;
}
.stat-card::after {
  content: ""; position: absolute; top: -40px; right: -40px;
  width: 120px; height: 120px; border-radius: 50%;
  background: var(--stat-glow, rgba(99, 102, 241, 0.12));
}
.stat-card .stat-icon {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center; font-size: 20px;
  color: var(--stat-color, var(--primary));
  background: var(--stat-glow, var(--primary-soft));
}
.stat-card .stat-value { font-size: 30px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; }
.stat-card .stat-label { font-size: 13px; color: var(--text-soft); font-weight: 500; }

.charts { grid-template-columns: 1fr 1fr; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}
.chart-card h3, .insights-card h3 { font-size: 15px; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.chart-card h3 i { color: var(--primary); }
.chart-card canvas { max-height: 260px; }
.insights-card { margin-top: 16px; }
.insights { display: flex; flex-direction: column; gap: 10px; }
.insight-item {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px 14px; border-radius: 10px;
  background: var(--surface-2); border: 1px solid var(--border);
  font-size: 13.5px; line-height: 1.5; color: var(--text-soft);
}
.insight-item i { margin-top: 2px; font-size: 18px; }
.insight-item.warning i { color: var(--warning); }
.insight-item.success i { color: var(--success); }
.insight-item.info i { color: var(--primary); }
.insight-item.danger i { color: var(--danger); }
.insight-item b { color: var(--text); }

/* ---------- Modales ---------- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(15, 17, 23, 0.55);
  backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  padding: 20px;
  animation: fadeIn 0.2s ease;
}
#confirmModal { z-index: 150; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  width: 100%; max-width: 520px;
  padding: 24px;
  animation: modalIn 0.25s ease;
}
.modal-sm { max-width: 420px; }
.modal-lg { max-width: 620px; }
.modal-note { font-size: 13px; color: var(--text-soft); margin: -8px 0 16px; line-height: 1.5; }
.badge-count {
  background: var(--surface-2); border: 1px solid var(--border);
  color: var(--text-soft); font-size: 11px; font-weight: 700;
  min-width: 18px; height: 18px; padding: 0 5px;
  display: inline-grid; place-items: center; border-radius: 999px;
}
.badge-count.has-items { background: var(--primary-soft); color: var(--primary); border-color: transparent; }
.archive-list { display: flex; flex-direction: column; gap: 10px; max-height: 46vh; overflow-y: auto; }
.archive-item {
  display: flex; align-items: center; gap: 12px;
  background: var(--surface-2); border: 1px solid var(--border);
  border-left: 4px solid #ec4899;
  border-radius: var(--radius-sm); padding: 12px 14px;
}
.archive-info { flex: 1; min-width: 0; }
.archive-title { font-size: 14px; font-weight: 600; margin-bottom: 6px; word-break: break-word; }
.archive-meta { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.archive-actions { display: flex; gap: 4px; }
.archive-actions .mini-btn {
  width: 34px; height: 34px; display: grid; place-items: center;
  border: none; background: transparent; color: var(--text-soft);
  border-radius: 8px; cursor: pointer; font-size: 18px; transition: all 0.15s;
}
.archive-actions .mini-btn:hover { background: var(--surface); color: var(--primary); }
.archive-actions .mini-btn.delete:hover { color: var(--danger); background: rgba(239, 68, 68, 0.1); }
@keyframes modalIn { from { opacity: 0; transform: translateY(12px) scale(0.98); } to { opacity: 1; transform: none; } }
.modal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.modal-header h2 { font-size: 18px; font-weight: 700; }
.modal > p { color: var(--text-soft); font-size: 14px; line-height: 1.6; margin-bottom: 20px; }

.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.form-group label { font-size: 13px; font-weight: 600; color: var(--text-soft); }
.form-group input, .form-group select, .form-group textarea {
  background: var(--surface-2); border: 1px solid var(--border); color: var(--text);
  font-family: inherit; font-size: 14px;
  padding: 10px 12px; border-radius: 10px; outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  resize: vertical;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--primary); box-shadow: 0 0 0 3px var(--primary-soft);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; margin-top: 8px; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(20px);
  background: var(--text); color: var(--bg);
  padding: 12px 20px; border-radius: 12px; font-size: 14px; font-weight: 600;
  box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none;
  transition: all 0.3s ease; z-index: 200;
  display: flex; align-items: center; gap: 8px;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast i { color: var(--success); }
.toast.warning { background: linear-gradient(135deg, #ef4444, #f97316); color: #fff; }
.toast.warning i { color: #fff; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .charts { grid-template-columns: 1fr; }
  .board { grid-template-columns: 1fr; }
  .topbar { flex-wrap: wrap; }
  .tabs { order: 3; width: 100%; margin-left: 0; }
  .tab { flex: 1; justify-content: center; }
}

@media (max-width: 640px) {
  .app { padding: 0 12px 32px; }
  .topbar { gap: 10px; padding: 14px 0 12px; }
  .brand-logo { width: 38px; height: 38px; font-size: 20px; border-radius: 10px; }
  .brand-text h1 { font-size: 17px; }
  .brand-text span { font-size: 11px; }
  .topbar-actions { gap: 8px; }
  .topbar-actions .btn { padding: 9px 12px; }
  .tab { padding: 8px 10px; font-size: 13px; }

  .board-toolbar { flex-direction: column; align-items: stretch; gap: 10px; margin-bottom: 14px; }
  .search-box { min-width: 0; }
  .filter-group { width: 100%; flex-wrap: wrap; }
  .filter-group select { flex: 1; min-width: 0; }
  .board-actions { width: 100%; flex-wrap: wrap; }
  .board-actions .btn { flex: 1 1 45%; min-width: 0; justify-content: center; padding: 9px 8px; font-size: 13px; }

  .board { gap: 14px; }
  .column { padding: 12px; }

  .stats-cards { grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 12px; }
  .stat-card { padding: 14px; }
  .stat-card .stat-value { font-size: 24px; }
  .stat-card .stat-icon { width: 34px; height: 34px; font-size: 17px; }

  .chart-card { padding: 14px; }
  .chart-card h3 { font-size: 13.5px; }

  .modal { padding: 18px; }
  .modal-overlay { padding: 12px; align-items: flex-end; }
  .modal { max-width: 100%; border-radius: 16px 16px 0 0; }
  .modal-sm { max-width: 100%; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .modal-footer .btn { flex: 1; justify-content: center; }

  .task-card { padding: 12px; }
  .toast { width: calc(100% - 32px); text-align: center; justify-content: center; }
  .archive-item { flex-direction: column; align-items: flex-start; }
  .archive-actions { width: 100%; justify-content: flex-end; }
}

/* Touch: mostrar siempre los controles de columna (no hay hover) */
@media (hover: none) {
  .column-tools { opacity: 1; }
}

.hidden { display: none !important; }
[hidden] { display: none !important; }
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 999px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-soft); }