/* ==========================================================================
   Dev Tasks — Global Styles
   Stack: Bootstrap 5 (dark theme) + custom layer
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design Tokens
   -------------------------------------------------------------------------- */
:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-2: #21262d;
  --color-border: #30363d;
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;

  /* Priority */
  --color-priority-alta: #f85149;
  --color-priority-media: #d29922;
  --color-priority-baixa: #3fb950;

  /* Columns */
  --color-todo: #58a6ff;
  --color-doing: #d29922;
  --color-done: #3fb950;

  /* Spacing */
  --header-height: 3.5rem;
  --column-min-width: 300px;
  --column-max-width: 380px;
  --card-radius: 0.625rem;
  --column-radius: 0.75rem;

  /* Transitions */
  --transition-speed: 180ms;
  --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* --------------------------------------------------------------------------
   2. Base / Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* --------------------------------------------------------------------------
   3. Header
   -------------------------------------------------------------------------- */
.app-header {
  height: var(--header-height);
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  flex-shrink: 0;
  z-index: 100;
}

.app-logo {
  font-size: 1.4rem;
  color: var(--color-todo);
  line-height: 1;
}

.app-title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   4. Stats Panel
   -------------------------------------------------------------------------- */
.stats-panel {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  animation: slideDown var(--transition-speed) var(--transition-ease);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Stat summary cards */
.stat-card {
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 0.75rem;
  text-align: center;
  transition: transform var(--transition-speed) var(--transition-ease);
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-card__count {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 0.25rem;
}

.stat-card__label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
}

.stat-card--todo .stat-card__count  { color: var(--color-todo); }
.stat-card--doing .stat-card__count { color: var(--color-doing); }
.stat-card--done .stat-card__count  { color: var(--color-done); }

/* Chart */
.chart-wrapper {
  position: relative;
  height: 120px;
}

/* --------------------------------------------------------------------------
   5. Kanban Board
   -------------------------------------------------------------------------- */
#board {
  flex: 1;
  overflow: hidden;
  padding-top: 1rem;
  padding-bottom: 1rem;
}

.kanban-columns {
  display: flex;
  gap: 1rem;
  height: 100%;
  overflow-x: auto;
  padding-bottom: 0.5rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

/* --------------------------------------------------------------------------
   6. Kanban Column
   -------------------------------------------------------------------------- */
.kanban-column {
  flex: 1 0 var(--column-min-width);
  max-width: var(--column-max-width);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--column-radius);
  display: flex;
  flex-direction: column;
  scroll-snap-align: start;
  min-height: 0;
}

.kanban-column__header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.kanban-column__title {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0;
  color: var(--color-text);
}

/* Column colour dot */
.column-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.column-dot--todo  { background-color: var(--color-todo); }
.column-dot--doing { background-color: var(--color-doing); }
.column-dot--done  { background-color: var(--color-done); }

/* Badge */
.column-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.3rem;
  height: 1.3rem;
  padding: 0 0.3rem;
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: 0.9rem;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-text-muted);
  line-height: 1;
}

/* Add inline button */
.btn-add-inline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.6rem;
  height: 1.6rem;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  border-radius: 0.375rem;
  cursor: pointer;
  transition:
    color var(--transition-speed) var(--transition-ease),
    background-color var(--transition-speed) var(--transition-ease);
  font-size: 1rem;
  padding: 0;
}

.btn-add-inline:hover,
.btn-add-inline:focus-visible {
  color: var(--color-text);
  background-color: var(--color-surface-2);
  outline: none;
}

/* Card list (droppable zone) */
.kanban-column__list {
  flex: 1;
  overflow-y: auto;
  padding: 0.625rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 6rem; /* keeps drop zone visible when empty */
}

/* Drag-over highlight */
.kanban-column__list.drag-over {
  background-color: rgba(88, 166, 255, 0.05);
  border-radius: 0 0 var(--column-radius) var(--column-radius);
}

/* SortableJS ghost */
.sortable-ghost {
  opacity: 0.35;
  background-color: var(--color-surface-2);
  border-radius: var(--card-radius);
}

/* SortableJS drag clone */
.sortable-drag {
  opacity: 1;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* Empty column placeholder */
.kanban-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 2rem 1rem;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  text-align: center;
  pointer-events: none;
  user-select: none;
}

.kanban-empty i {
  font-size: 1.5rem;
  opacity: 0.4;
}

/* --------------------------------------------------------------------------
   7. Task Card (fallback — until Web Component is loaded)
   -------------------------------------------------------------------------- */
task-card,
.task-card {
  display: block;
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--card-radius);
  padding: 0.75rem;
  cursor: grab;
  transition:
    box-shadow var(--transition-speed) var(--transition-ease),
    transform var(--transition-speed) var(--transition-ease),
    border-color var(--transition-speed) var(--transition-ease);
  position: relative;
}

task-card:active,
.task-card:active {
  cursor: grabbing;
}

task-card:hover,
.task-card:hover {
  border-color: rgba(88, 166, 255, 0.35);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
  transform: translateY(-1px);
}

/* Priority stripe */
task-card::before,
.task-card::before {
  content: "";
  position: absolute;
  inset-block: 0;
  left: 0;
  width: 3px;
  border-radius: var(--card-radius) 0 0 var(--card-radius);
}

task-card[priority="alta"]::before,
.task-card[data-priority="alta"]::before   { background-color: var(--color-priority-alta); }
task-card[priority="media"]::before,
.task-card[data-priority="media"]::before  { background-color: var(--color-priority-media); }
task-card[priority="baixa"]::before,
.task-card[data-priority="baixa"]::before  { background-color: var(--color-priority-baixa); }

/* Overdue state */
task-card.overdue,
.task-card.overdue {
  border-color: rgba(248, 81, 73, 0.4);
}

/* --------------------------------------------------------------------------
   8. Priority Badge
   -------------------------------------------------------------------------- */
.badge-priority {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.15rem 0.5rem;
  border-radius: 0.9rem;
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  line-height: 1.4;
}

.badge-priority--alta  {
  background-color: rgba(248, 81, 73, 0.15);
  color: var(--color-priority-alta);
}

.badge-priority--media {
  background-color: rgba(210, 153, 34, 0.15);
  color: var(--color-priority-media);
}

.badge-priority--baixa {
  background-color: rgba(63, 185, 80, 0.15);
  color: var(--color-priority-baixa);
}

/* --------------------------------------------------------------------------
   9. Due Date
   -------------------------------------------------------------------------- */
.due-date {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.due-date--overdue {
  color: var(--color-priority-alta);
  font-weight: 600;
}

.due-date--soon {
  color: var(--color-priority-media);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   10. Task Modal
   -------------------------------------------------------------------------- */
.task-modal {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--column-radius);
}

.task-modal .modal-header {
  border-bottom-color: var(--color-border);
}

.task-modal .modal-footer {
  border-top-color: var(--color-border);
}

/* Bootstrap overrides for dark theme inputs */
.form-control,
.form-select {
  background-color: var(--color-surface-2);
  border-color: var(--color-border);
  color: var(--color-text);
}

.form-control:focus,
.form-select:focus {
  background-color: var(--color-surface-2);
  border-color: var(--color-todo);
  color: var(--color-text);
  box-shadow: 0 0 0 0.2rem rgba(88, 166, 255, 0.2);
}

.form-control::placeholder {
  color: var(--color-text-muted);
}

.form-label {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 0.3rem;
}

/* Validation states */
.form-control.is-invalid,
.form-select.is-invalid {
  border-color: var(--color-priority-alta);
}

.form-control.is-valid,
.form-select.is-valid {
  border-color: var(--color-priority-baixa);
}

.invalid-feedback {
  font-size: 0.75rem;
}

/* --------------------------------------------------------------------------
   11. Toast
   -------------------------------------------------------------------------- */
#app-toast {
  background-color: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  min-width: 220px;
}

#app-toast.toast--success { border-left: 3px solid var(--color-done); }
#app-toast.toast--error   { border-left: 3px solid var(--color-priority-alta); }
#app-toast.toast--info    { border-left: 3px solid var(--color-todo); }

/* --------------------------------------------------------------------------
   12. Offline Banner
   -------------------------------------------------------------------------- */
.offline-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: var(--color-priority-media);
  color: #0d1117;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.5rem 1rem;
  text-align: center;
  z-index: 9999;
  animation: slideUp 200ms var(--transition-ease);
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to   { transform: translateY(0); }
}

/* --------------------------------------------------------------------------
   13. Scrollbar Styling (WebKit)
   -------------------------------------------------------------------------- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background-color: var(--color-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   14. Focus Visible (accessibility)
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 2px solid var(--color-todo);
  outline-offset: 2px;
  border-radius: 2px;
}

/* --------------------------------------------------------------------------
   15. Responsive Breakpoints
   -------------------------------------------------------------------------- */

/* ≥ 1024px: three columns side-by-side (default — handled by flex above) */

/* 768px – 1023px: horizontal scroll */
@media (max-width: 1023px) {
  .kanban-column {
    flex: 0 0 calc(var(--column-min-width) + 20px);
  }

  body {
    overflow: hidden;
  }
}

/* < 768px: columns stacked vertically */
@media (max-width: 767px) {
  body {
    overflow-y: auto;
    overflow-x: hidden;
  }

  #board {
    overflow: visible;
  }

  .kanban-columns {
    flex-direction: column;
    overflow-x: hidden;
    overflow-y: visible;
    height: auto;
    scroll-snap-type: none;
  }

  .kanban-column {
    flex: none;
    max-width: 100%;
    min-height: 200px;
  }

  .kanban-column__list {
    max-height: 60vh;
  }

  .stats-panel .chart-wrapper {
    height: 160px;
  }
}

/* --------------------------------------------------------------------------
   16. Utility Classes
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-alta  { color: var(--color-priority-alta) !important; }
.text-media { color: var(--color-priority-media) !important; }
.text-baixa { color: var(--color-priority-baixa) !important; }