:root {
  --bg: #f3f4f8;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #9ca3af;
  --text-soft: #6b7280;
  --border: #e5e7eb;
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-bg: #eef2ff;
  --success: #15803d;
  --success-bg: #dcfce7;
  --danger: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --radius: 12px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  padding: clamp(16px, 8vh, 80px) 16px;
  background: var(--bg);
  color: var(--text);
  font-family: 'Tajawal', system-ui, sans-serif;
  line-height: 1.6;
}

/* Card: full width on phones, capped at a comfortable reading width on large screens */
.card {
  max-width: 560px;
  margin-inline: auto;
  padding: clamp(20px, 5vw, 32px);
  background: var(--card);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(31, 41, 55, 0.08);
}

/* Stats page needs room for three cards side by side */
.card-wide {
  max-width: 720px;
}

/* Links between the two pages */
.page-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.page-nav a {
  padding: 6px 12px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  border-radius: 8px;
}

.page-nav a:hover {
  color: var(--text);
  background: var(--bg);
}

.page-nav a[aria-current="page"] {
  color: var(--primary);
  background: var(--primary-bg);
}

.page-nav a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Logout sits at the far end of the navigation (left in RTL) */
.logout-btn {
  margin-inline-start: auto;
  padding: 6px 12px;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  background: none;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

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

/* Login page: a small card with one field */
.card-narrow {
  max-width: 400px;
}

.login-hint {
  margin: -12px 0 20px;
  color: var(--muted);
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.login-form input {
  width: 100%;
  height: 48px;
  padding: 0 14px;
  font: inherit;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.login-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.login-form button {
  height: 48px;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}

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

.login-form button:disabled {
  opacity: 0.6;
  cursor: wait;
}

h1 {
  margin: 0 0 20px;
  font-size: clamp(1.5rem, 4vw, 1.875rem);
  font-weight: 700;
}

/* Tabs: a two-part switch, the selected part looks raised */
.tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  margin-bottom: 20px;
  background: var(--bg);
  border-radius: var(--radius);
}

.tab {
  height: 44px;
  font: inherit;
  font-weight: 500;
  color: var(--muted);
  background: none;
  border: none;
  border-radius: 9px;
  cursor: pointer;
}

.tab:hover {
  color: var(--text);
}

.tab[aria-selected="true"] {
  font-weight: 700;
  color: var(--primary);
  background: var(--card);
  box-shadow: 0 1px 3px rgba(31, 41, 55, 0.12);
}

/* Period filter above the list */
.period-filter {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
  font-size: 0.875rem;
  color: var(--muted);
}

.period-filter select {
  height: 36px;
  padding: 0 10px;
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 8px;
}

.period-filter select:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 1px;
}

/* Add-task form: title on its own row, then person + date + button */
.task-form {
  display: grid;
  grid-template-columns: 1fr 1fr auto;
  align-items: end;
  gap: 8px;
  margin-bottom: 16px;
}

.task-title-input {
  grid-column: 1 / -1;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 0;
}

.field-label {
  font-size: 0.875rem;
  color: var(--muted);
}

.task-form input,
.task-form select {
  width: 100%;
  min-width: 0;
  height: 48px;
  padding: 0 14px;
  font: inherit;
  color: var(--text);
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.task-form input:focus,
.task-form select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
}

.task-form button {
  height: 48px;
  padding: 0 20px;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--primary);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
}

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

/* Narrow phones: person and date side by side, button on a full row */
@media (max-width: 420px) {
  .task-form {
    grid-template-columns: 1fr 1fr;
  }

  .task-form button {
    grid-column: 1 / -1;
  }
}

button:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Task list */
.task-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.task-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 4px;
  border-bottom: 1px solid var(--border);
}

.task-item:last-child {
  border-bottom: none;
}

.task-label {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
  cursor: pointer;
}

.task-label input {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin: 0;
  accent-color: var(--primary);
  cursor: pointer;
}

.task-text {
  display: flex;
  flex-direction: column;
  align-items: flex-start; /* start = right in RTL, even for English titles */
  gap: 2px;
  min-width: 0;
}

.task-title {
  overflow-wrap: anywhere;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  color: var(--muted);
}

.badge {
  padding: 0 8px;
  font-size: 0.75rem;
  font-weight: 500;
  line-height: 1.6;
  border-radius: 999px;
}

.badge-shared {
  color: var(--primary);
  background: var(--primary-bg);
}

.badge-overdue {
  display: none;
  color: var(--danger);
  background: var(--danger-bg);
}

/* Completed task: strike-through and faded, driven by the checkbox state */
.task-item:has(input:checked) .task-title {
  text-decoration: line-through;
  color: var(--muted);
}

/* Overdue task (not completed and past its due date): only the badge is shown in red */
.task-item.overdue .badge-overdue {
  display: inline-block;
}

/* Icon-only button: 40x40 keeps it easy to tap on phones */
.delete-btn {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  color: var(--muted);
  background: none;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

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

/* Stats page: one column on phones, three columns when there is room */
.stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 16px;
}

@media (min-width: 640px) {
  .stats-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.stat-card {
  padding: 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.stat-name {
  margin: 0 0 12px;
  font-size: 1.125rem;
  font-weight: 700;
}

.progress {
  height: 8px;
  overflow: hidden;
  background: var(--bg);
  border-radius: 999px;
}

.progress-fill {
  width: 0;
  height: 100%;
  background: var(--success);
  border-radius: 999px;
  transition: width 0.3s ease;
}

.progress-text {
  margin: 6px 0 12px;
  font-size: 0.8125rem;
  color: var(--muted);
}

/* Four numbers in a 2x2 grid */
.stat-numbers {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  margin: 0;
}

.stat-numbers div {
  padding: 8px 10px;
  background: var(--bg);
  border-radius: 8px;
}

.stat-numbers dt {
  font-size: 0.75rem;
  color: var(--muted);
}

.stat-numbers dd {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 700;
  line-height: 1.3;
}

.stat-numbers .stat-completed {
  color: var(--success);
}

.stat-numbers .stat-overdue {
  color: var(--danger);
}

/* Zero is shown in grey for every number (overrides green/red above) */
.stat-numbers dd.is-zero {
  color: var(--text-soft);
}

/* Messages */
.empty-message {
  margin: 0;
  padding: 24px 0 8px;
  text-align: center;
  color: var(--muted);
}

.notice {
  margin: 0 0 16px;
  padding: 12px 14px;
  color: var(--primary);
  background: var(--primary-bg);
  border-radius: var(--radius);
}

.error-message {
  margin: 0 0 16px;
  padding: 12px 14px;
  color: var(--danger);
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  border-radius: var(--radius);
}