:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --text: #1f2430;
  --muted: #6b7280;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --border: #e5e7eb;
  --pending: #f59e0b;
  --in-progress: #3b82f6;
  --done: #10b981;
  --danger: #ef4444;
  --radius: 10px;
}

* {
  box-sizing: border-box;
}

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

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.app-header {
  padding: 16px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.app-header h1 {
  margin: 0;
  font-size: 1.25rem;
}

.logout-btn {
  padding: 6px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.85rem;
  cursor: pointer;
}

.logout-btn:hover {
  color: var(--danger);
  border-color: var(--danger);
}

.login-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 100;
}

.login-overlay[hidden] {
  display: none;
}

.login-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  width: 100%;
  max-width: 320px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.login-form h2 {
  margin: 0 0 4px 0;
  font-size: 1.1rem;
  text-align: center;
}

.login-form input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
}

.login-form button {
  padding: 10px 14px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
}

.login-form button:hover {
  background: var(--primary-dark);
}

.app-main {
  padding: 12px;
  max-width: 1100px;
  margin: 0 auto;
}

.task-form {
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--surface);
  padding: 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  margin-bottom: 12px;
}

.task-form input {
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.95rem;
  width: 100%;
}

.task-form input:focus {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

.task-form button {
  padding: 10px 14px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 0.95rem;
  cursor: pointer;
  font-weight: 600;
}

.task-form button:hover {
  background: var(--primary-dark);
}

.error-banner {
  background: #fee2e2;
  color: #991b1b;
  padding: 10px 12px;
  border-radius: 8px;
  margin-bottom: 12px;
  font-size: 0.9rem;
}

.mobile-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 10px;
}

.tab-btn {
  flex: 1;
  padding: 10px 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--muted);
  font-weight: 600;
}

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

/* Mobile first: columnas apiladas, se muestran segun tab activo */
.board {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.column {
  display: none;
  background: var(--surface);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  padding: 10px;
  min-height: 120px;
}

.column.visible {
  display: block;
}

.column-title {
  font-size: 0.95rem;
  margin: 0 0 10px 0;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--muted);
}

.column[data-status="pending"] .column-title {
  color: var(--pending);
}
.column[data-status="in_progress"] .column-title {
  color: var(--in-progress);
}
.column[data-status="done"] .column-title {
  color: var(--done);
}

.count {
  background: var(--bg);
  border-radius: 999px;
  padding: 1px 8px;
  font-size: 0.75rem;
  color: var(--text);
}

.task-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.empty-hint {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
  padding: 20px 0;
}

.task-card {
  background: var(--bg);
  border-radius: 8px;
  padding: 10px 12px;
  border: 1px solid var(--border);
}

.task-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 8px;
}

.task-title {
  margin: 0;
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}

.task-description {
  margin: 6px 0 8px 0;
  font-size: 0.85rem;
  color: var(--muted);
  overflow-wrap: anywhere;
}

.delete-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-size: 1.2rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 4px;
}

.delete-btn:hover {
  color: var(--danger);
}

.task-actions {
  display: flex;
  justify-content: flex-end;
}

.next-status-btn {
  padding: 7px 12px;
  border-radius: 6px;
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--surface);
  cursor: pointer;
  white-space: nowrap;
}

.next-status-btn:hover {
  background: var(--bg);
}

.next-status-btn.status-pending {
  color: var(--pending);
  border-color: var(--pending);
}

.next-status-btn.status-in_progress {
  color: var(--in-progress);
  border-color: var(--in-progress);
}

.next-status-btn.status-done {
  color: var(--done);
  border-color: var(--done);
}

/* Desktop: kanban en 3 columnas, ocultar tabs */
@media (min-width: 768px) {
  .mobile-tabs {
    display: none;
  }

  .board {
    flex-direction: row;
  }

  .column {
    display: block;
    flex: 1;
    min-width: 0;
  }

  .app-main {
    padding: 24px;
  }

  .task-form {
    flex-direction: row;
    align-items: center;
  }

  .task-form input {
    width: auto;
    flex: 1;
  }
}