/* ============================
   Tasker — Personal Task Manager
   Stylesheet
   ============================ */

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

:root {
  /* Light theme tokens */
  --bg: #FAFAFA;
  --surface: #FFFFFF;
  --surface-2: #F4F4F5;
  --surface-hover: #F4F4F5;
  --border: #E4E4E7;
  --border-strong: #D4D4D8;
  --text: #09090B;
  --text-muted: #71717A;
  --text-subtle: #A1A1AA;
  --accent: #4F46E5;
  --accent-hover: #4338CA;
  --accent-soft: #EEF2FF;
  --accent-text: #FFFFFF;
  --danger: #DC2626;
  --danger-soft: #FEF2F2;
  --warning: #D97706;
  --success: #16A34A;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 25px -5px rgba(0,0,0,0.10), 0 8px 10px -6px rgba(0,0,0,0.06);
  --shadow-modal: 0 25px 50px -12px rgba(0,0,0,0.25);
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 14px;
  --sidebar-w: 260px;
  --topbar-h: 64px;

  /* Priority colours */
  --p-urgent: #DC2626;
  --p-high: #EA580C;
  --p-medium: #2563EB;
  --p-low: #71717A;
  --p-none: #D4D4D8;
}

[data-theme="dark"] {
  --bg: #0A0A0B;
  --surface: #131316;
  --surface-2: #1C1C20;
  --surface-hover: #1C1C20;
  --border: #27272A;
  --border-strong: #3F3F46;
  --text: #FAFAFA;
  --text-muted: #A1A1AA;
  --text-subtle: #71717A;
  --accent: #6366F1;
  --accent-hover: #818CF8;
  --accent-soft: #1E1B4B;
  --accent-text: #FFFFFF;
  --danger: #EF4444;
  --danger-soft: #2A1414;
  --warning: #F59E0B;
  --success: #22C55E;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 8px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
  --shadow-modal: 0 25px 50px -12px rgba(0,0,0,0.7);

  --p-urgent: #EF4444;
  --p-high: #F97316;
  --p-medium: #3B82F6;
  --p-low: #A1A1AA;
  --p-none: #3F3F46;
}

html, body {
  height: 100%;
  font-family: 'Manrope', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
  overflow: hidden;
}

button, input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

input, select, textarea {
  outline: none;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  transition: border-color 0.15s, box-shadow 0.15s;
  width: 100%;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}
textarea { resize: vertical; }
select { cursor: pointer; }

kbd {
  font-family: 'Manrope', monospace;
  font-size: 11px;
  font-weight: 600;
  padding: 1px 6px;
  border-radius: 4px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-muted);
  line-height: 1.4;
}

/* ============================
   Sidebar
   ============================ */
.sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 16px 12px;
  gap: 8px;
  overflow-y: auto;
  height: 100vh;
  position: relative;
  z-index: 30;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 4px 8px 16px;
}
.brand-mark {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  background: var(--accent);
  color: #fff;
  border-radius: 8px;
}
.brand-name {
  font-weight: 800;
  font-size: 16px;
  letter-spacing: -0.01em;
}

.nav-section {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-bottom: 12px;
}
.nav-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-subtle);
  padding: 8px 8px 6px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 8px;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  font-weight: 500;
  width: 100%;
  text-align: left;
  transition: background 0.12s, color 0.12s;
}
.nav-item:hover {
  background: var(--surface-2);
  color: var(--text);
}
.nav-item.active {
  background: var(--accent-soft);
  color: var(--accent);
}
[data-theme="dark"] .nav-item.active {
  color: var(--accent-hover);
}
.nav-item svg { flex-shrink: 0; }
.nav-item span:first-of-type {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.count {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-subtle);
  background: var(--surface-2);
  padding: 1px 7px;
  border-radius: 999px;
  min-width: 20px;
  text-align: center;
}
.nav-item.active .count {
  background: var(--accent);
  color: #fff;
}
.overdue-count[data-value]:not([data-value="0"]) {
  color: var(--danger);
  background: var(--danger-soft);
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.project-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 7px 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  color: var(--text-muted);
  font-weight: 500;
  transition: background 0.12s;
}
.project-item:hover {
  background: var(--surface-2);
  color: var(--text);
}
.project-item:hover .project-edit { opacity: 1; }
.project-item.active {
  background: var(--accent-soft);
  color: var(--text);
}
.project-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  flex-shrink: 0;
  display: inline-block;
}
.project-item .project-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.project-edit {
  opacity: 0;
  background: none;
  border: none;
  padding: 2px;
  border-radius: 4px;
  cursor: pointer;
  color: var(--text-subtle);
  display: grid;
  place-items: center;
  transition: opacity 0.12s, color 0.12s;
}
.project-edit:hover { color: var(--text); background: var(--border); }
.no-projects {
  font-size: 12px;
  color: var(--text-subtle);
  padding: 8px;
  font-style: italic;
}

.sidebar-footer {
  margin-top: auto;
  display: flex;
  gap: 4px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.icon-btn {
  background: transparent;
  border: none;
  padding: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-muted);
  display: grid;
  place-items: center;
  transition: background 0.12s, color 0.12s;
}
.icon-btn:hover {
  background: var(--surface-2);
  color: var(--text);
}

.theme-toggle .sun-icon { display: none; }
.theme-toggle .moon-icon { display: block; }
[data-theme="dark"] .theme-toggle .sun-icon { display: block; }
[data-theme="dark"] .theme-toggle .moon-icon { display: none; }

/* ============================
   Main / Topbar
   ============================ */
.main {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  height: 100vh;
}

.topbar {
  height: var(--topbar-h);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  background: var(--surface);
  flex-shrink: 0;
}

.menu-toggle { display: none; }

.view-title {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex: 1;
  min-width: 0;
}
.view-title h1 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.01em;
  white-space: nowrap;
}
.view-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

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

.search-wrap {
  position: relative;
  display: flex;
  align-items: center;
}
.search-wrap svg {
  position: absolute;
  left: 10px;
  color: var(--text-subtle);
  pointer-events: none;
}
.search-wrap input {
  padding-left: 32px;
  padding-right: 32px;
  width: 240px;
  background: var(--surface-2);
  border-color: transparent;
}
.search-wrap input:focus { background: var(--surface); }
.search-kbd {
  position: absolute;
  right: 8px;
  pointer-events: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  cursor: pointer;
  font-weight: 600;
  font-size: 13px;
  transition: background 0.12s, border-color 0.12s, transform 0.06s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--accent);
  color: var(--accent-text);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-primary kbd {
  background: rgba(255,255,255,0.18);
  color: rgba(255,255,255,0.9);
  border-color: rgba(255,255,255,0.18);
}
.btn-ghost {
  color: var(--text-muted);
  border-color: var(--border);
}
.btn-ghost:hover {
  background: var(--surface-2);
  color: var(--text);
}
.btn-danger {
  color: var(--danger);
  border-color: transparent;
}
.btn-danger:hover {
  background: var(--danger-soft);
}
.btn-danger-solid {
  background: var(--danger);
  color: #fff;
}
.btn-danger-solid:hover { filter: brightness(1.08); }

/* ============================
   Stats Row
   ============================ */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  padding: 20px 24px 8px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-subtle);
}
.stat-value {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.stat-sub {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}
.stat-card.urgent .stat-value { color: var(--danger); }
.stat-card.success .stat-value { color: var(--success); }

/* ============================
   Task Area
   ============================ */
.task-area {
  flex: 1;
  overflow-y: auto;
  padding: 8px 24px 24px;
}
.task-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.task-group-header {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-subtle);
  padding: 18px 12px 8px;
}

.task-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 11px 12px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  background: var(--surface);
  transition: background 0.12s, border-color 0.12s, transform 0.08s;
  position: relative;
}
.task-item:hover {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}
.task-item.completed .task-title-text {
  color: var(--text-subtle);
  text-decoration: line-through;
}
.task-item.completed { opacity: 0.7; }

.task-check {
  width: 18px;
  height: 18px;
  border: 1.5px solid var(--border-strong);
  border-radius: 50%;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: all 0.15s;
  flex-shrink: 0;
  background: transparent;
  padding: 0;
}
.task-check:hover {
  border-color: var(--accent);
}
.task-check.checked {
  background: var(--accent);
  border-color: var(--accent);
}
.task-check.checked svg {
  color: #fff;
  display: block;
}
.task-check svg { display: none; }

.task-check.priority-urgent { border-color: var(--p-urgent); }
.task-check.priority-high { border-color: var(--p-high); }
.task-check.priority-medium { border-color: var(--p-medium); }

.task-body {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}
.task-title-text {
  font-weight: 500;
  font-size: 14px;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.task-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  font-size: 12px;
  color: var(--text-muted);
}
.task-meta-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.task-meta-item svg { flex-shrink: 0; }
.task-meta-item.overdue { color: var(--danger); font-weight: 600; }
.task-meta-item.today { color: var(--accent); font-weight: 600; }

.task-tag {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--surface-2);
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
}
.task-tag .project-dot { width: 7px; height: 7px; }

.priority-pill {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 2px 8px;
  border-radius: 4px;
}
.priority-pill.urgent { background: color-mix(in srgb, var(--p-urgent) 15%, transparent); color: var(--p-urgent); }
.priority-pill.high { background: color-mix(in srgb, var(--p-high) 15%, transparent); color: var(--p-high); }
.priority-pill.medium { background: color-mix(in srgb, var(--p-medium) 15%, transparent); color: var(--p-medium); }
.priority-pill.low { background: var(--surface-2); color: var(--text-muted); }

.task-status {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--surface-2);
}
.task-status.in-progress { color: var(--warning); background: color-mix(in srgb, var(--warning) 12%, transparent); }

.task-action {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity 0.12s;
}
.task-item:hover .task-action { opacity: 1; }

/* ============================
   Empty State
   ============================ */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.empty-illustration {
  color: var(--border-strong);
  margin-bottom: 8px;
}
.empty-state h3 {
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
}
.empty-state p { font-size: 13px; }
.empty-state kbd { margin: 0 2px; }
.hidden { display: none !important; }

/* ============================
   Modal
   ============================ */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.45);
  display: grid;
  place-items: center;
  z-index: 100;
  padding: 20px;
  animation: fadeIn 0.15s ease-out;
}
.modal-backdrop[hidden] { display: none; }
.toast[hidden] { display: none; }
[data-theme="dark"] .modal-backdrop {
  background: rgba(0,0,0,0.65);
}

.modal {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-modal);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: slideUp 0.2s ease-out;
}
.confirm-modal { max-width: 400px; }

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

.modal-header {
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
}
.modal-header h2 {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.modal-body {
  padding: 20px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.modal-body h3 {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 6px;
}
.modal-body p { color: var(--text-muted); }

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}
.footer-right {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.task-title-input {
  font-size: 18px;
  font-weight: 600;
  padding: 4px 0;
  border: none;
  border-bottom: 1px solid transparent;
  border-radius: 0;
  background: transparent;
}
.task-title-input:focus {
  border-bottom-color: var(--border);
  box-shadow: none;
}
.task-desc-input {
  border: none;
  background: transparent;
  padding: 4px 0;
  color: var(--text-muted);
  border-radius: 0;
}
.task-desc-input:focus {
  box-shadow: none;
  color: var(--text);
}

.task-meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}

/* Subtasks */
.subtasks-section {
  border-top: 1px solid var(--border);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.subtasks-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.subtasks-header label {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
}
.subtask-counter {
  font-size: 11px;
  color: var(--text-subtle);
  font-weight: 600;
}

.subtasks-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.subtask-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
}
.subtask-item.done .subtask-text {
  color: var(--text-subtle);
  text-decoration: line-through;
}
.subtask-check {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--border-strong);
  border-radius: 4px;
  display: grid;
  place-items: center;
  cursor: pointer;
  background: transparent;
  flex-shrink: 0;
  padding: 0;
}
.subtask-check.checked {
  background: var(--accent);
  border-color: var(--accent);
}
.subtask-check svg { display: none; color: #fff; }
.subtask-check.checked svg { display: block; }

.subtask-text {
  flex: 1;
  font-size: 13px;
  background: transparent;
  border: none;
  padding: 4px;
  outline: none;
  color: var(--text);
}
.subtask-text:focus { box-shadow: none; }
.subtask-delete {
  background: none;
  border: none;
  padding: 4px;
  cursor: pointer;
  color: var(--text-subtle);
  border-radius: 4px;
  opacity: 0;
  display: grid;
  place-items: center;
}
.subtask-item:hover .subtask-delete { opacity: 1; }
.subtask-delete:hover { color: var(--danger); background: var(--danger-soft); }

.add-subtask input {
  background: transparent;
  border: 1px dashed var(--border);
  font-size: 13px;
}
.add-subtask input::placeholder { color: var(--text-subtle); }

/* Colour grid */
.colour-grid {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.colour-swatch {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.1s;
  position: relative;
}
.colour-swatch:hover { transform: scale(1.08); }
.colour-swatch.selected {
  border-color: var(--text);
  transform: scale(1.08);
}
.colour-swatch.selected::after {
  content: "";
  position: absolute;
  inset: 4px;
  background: rgba(255,255,255,0.4);
  border-radius: 4px;
}

/* ============================
   Toast
   ============================ */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  padding: 10px 18px;
  border-radius: var(--radius);
  font-size: 13px;
  font-weight: 500;
  z-index: 200;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.2s ease-out;
}
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 10px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}

/* ============================
   Scrollbar
   ============================ */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 10px; border: 2px solid var(--bg); }
::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }
.sidebar::-webkit-scrollbar-thumb { border-color: var(--surface); }

/* ============================
   Responsive
   ============================ */
@media (max-width: 900px) {
  body { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    transform: translateX(-100%);
    transition: transform 0.2s;
    box-shadow: var(--shadow-lg);
  }
  .sidebar.open { transform: translateX(0); }
  .menu-toggle { display: grid; }
  .stats-row { grid-template-columns: repeat(2, 1fr); padding: 16px; }
  .task-area { padding: 8px 16px 16px; }
  .topbar { padding: 0 16px; gap: 10px; }
  .search-wrap input { width: 180px; }
  .btn-primary span { display: none; }
  .btn-primary kbd { display: none; }
}

@media (max-width: 540px) {
  .search-wrap { display: none; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .task-meta-grid { grid-template-columns: 1fr; }
}