.todo-app {
  padding-top: 24px;
}

.todo-topbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 16px;
}

.todo-topbar h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 400;
}

.todo-topbar p {
  max-width: 620px;
  margin: 6px 0 0;
  color: var(--text-muted);
  font: 500 0.9375rem/1.45 var(--font-sans);
}

.todo-count {
  flex: 0 0 auto;
  color: var(--text-muted);
  font: 700 0.75rem/1 var(--font-sans);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.todo-workspace {
  display: grid;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
  min-height: 620px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.todo-sidebar {
  border-right: 1px solid var(--border-subtle);
  background: var(--surface-muted);
}

.todo-sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 16px;
  border-bottom: 1px solid var(--border-subtle);
}

.todo-sidebar-header h2 {
  margin: 0;
  font: 700 0.875rem/1.2 var(--font-sans);
}

.todo-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.todo-button {
  width: 100%;
  min-height: 92px;
  padding: 15px 16px;
  border: 0;
  border-bottom: 1px solid var(--border-subtle);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  font: inherit;
  text-align: left;
}

.todo-button:hover,
.todo-button[aria-selected="true"] {
  background: #fff;
}

.todo-button[aria-selected="true"] {
  box-shadow: inset 3px 0 0 var(--brand);
}

.todo-button strong {
  display: block;
  font: 700 0.9375rem/1.3 var(--font-sans);
}

.todo-button span {
  display: block;
  margin-top: 7px;
  color: var(--text-muted);
  font: 600 0.75rem/1.35 var(--font-sans);
}

.todo-detail {
  min-width: 0;
  background: var(--surface);
}

.todo-item {
  display: grid;
  gap: 22px;
  padding: clamp(22px, 4vw, 34px);
}

.todo-item[hidden] {
  display: none;
}

.detail-header {
  display: grid;
  gap: 12px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--border-subtle);
}

.detail-header h2 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(1.7rem, 3vw, 2.25rem);
  font-weight: 400;
}

.detail-header p {
  max-width: 760px;
  margin: 0;
  color: var(--text-muted);
  font: 500 1rem/1.55 var(--font-sans);
}

.todo-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.todo-section-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.todo-section {
  padding: 16px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: var(--surface-muted);
}

.todo-section h3 {
  margin-bottom: 10px;
  font-size: 0.9375rem;
}

.todo-section ul {
  margin: 0;
  padding-left: 18px;
  color: var(--text-muted);
  font: 500 0.9375rem/1.55 var(--font-sans);
}

.plan-link {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  max-width: 100%;
  padding: 13px 14px;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  background: #fff;
  text-decoration: none;
}

.plan-link:hover {
  border-color: var(--brand);
  background: var(--mint);
}

.plan-link strong {
  color: var(--text);
  font: 700 0.875rem/1.3 var(--font-sans);
}

.plan-link span {
  max-width: 100%;
  margin-top: 3px;
  overflow-wrap: anywhere;
  color: var(--text-muted);
  font: 600 0.75rem/1.35 var(--font-mono);
}

@media (max-width: 820px) {
  .todo-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .todo-workspace,
  .todo-section-grid {
    grid-template-columns: 1fr;
  }

  .todo-workspace {
    min-height: 0;
  }

  .todo-sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--border-subtle);
  }
}