:root {
  --color-bg: #f7f7f5;
  --color-surface: #ffffff;
  --color-text: #18181b;
  --color-muted: #52525b;
  --color-border: #71717a;
  --color-divider: #d4d4d8;
  --color-action: #1d4ed8;
  --color-action-hover: #1e40af;
  --color-danger: #b91c1c;
  --color-danger-hover: #991b1b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 48px 24px;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

button,
input {
  font: inherit;
}

button,
a,
input {
  min-height: 44px;
}

button:focus-visible,
a:focus-visible,
input:focus-visible {
  outline: 3px solid var(--color-action);
  outline-offset: 2px;
}

.task-panel {
  width: min(100%, 720px);
  margin: 0 auto;
  padding: 32px;
  border: 1px solid var(--color-divider);
  border-radius: 12px;
  background: var(--color-surface);
}

.page-header h1 {
  margin: 0;
  font-size: 32px;
  line-height: 1.2;
}

.page-header p,
.task-count,
.empty-state p {
  color: var(--color-muted);
}

.page-header p {
  margin: 4px 0 24px;
}

.account-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.account-row > div:first-child {
  min-width: 0;
}

.signout-form {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
  margin: 0;
}

.account-email {
  color: var(--color-muted);
  font-size: 14px;
  overflow-wrap: anywhere;
  text-align: right;
}

.link-button {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--color-action);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.link-button:hover {
  color: var(--color-action-hover);
}

.auth-panel .page-header p {
  margin-bottom: 16px;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.auth-form .primary-button {
  align-self: stretch;
}

.field-hint {
  margin: 6px 0 0;
  color: var(--color-muted);
  font-size: 14px;
}

.auth-switch {
  margin: 24px 0 0;
  text-align: center;
  color: var(--color-muted);
}

.auth-switch a {
  color: var(--color-action);
  font-weight: 650;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.auth-switch a:hover {
  color: var(--color-action-hover);
}

.add-form {
  display: flex;
  align-items: flex-end;
  gap: 12px;
}

.field {
  flex: 1;
  min-width: 0;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 650;
}

input[type="text"] {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  color: var(--color-text);
  background: var(--color-surface);
}

input[aria-invalid="true"] {
  border-color: var(--color-danger);
}

.primary-button {
  padding: 9px 18px;
  border: 1px solid var(--color-action);
  border-radius: 8px;
  background: var(--color-action);
  color: #ffffff;
  font-weight: 650;
  cursor: pointer;
}

.primary-button:hover {
  background: var(--color-action-hover);
}

.error {
  margin: 8px 0 0;
  color: var(--color-danger);
  font-size: 14px;
}

.server-error {
  margin-top: 16px;
}

.tasks-section {
  margin-top: 32px;
}

.toolbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-divider);
}

.toolbar h2 {
  margin: 0;
  font-size: 20px;
  line-height: 1.3;
}

.task-count {
  margin: 2px 0 0;
  font-size: 14px;
}

.filters {
  display: flex;
  gap: 4px;
}

.filters a {
  display: inline-flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 8px;
  color: var(--color-action);
  text-decoration: none;
}

.filters a:hover {
  text-decoration: underline;
}

.filters a[aria-current="page"] {
  background: #dbeafe;
  color: #1e3a8a;
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

.task-row {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-divider);
}

.task-row form {
  margin: 0;
}

.toggle {
  position: relative;
  width: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
}

.toggle::before {
  content: "";
  position: absolute;
  top: 10px;
  left: 10px;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-border);
  border-radius: 6px;
  background: var(--color-surface);
}

.toggle[aria-checked="true"]::before {
  border-color: var(--color-action);
  background: var(--color-action);
}

.toggle[aria-checked="true"]::after {
  content: "";
  position: absolute;
  top: 15px;
  left: 17px;
  width: 7px;
  height: 4px;
  border: solid #ffffff;
  border-width: 0 0 2px 2px;
  transform: rotate(-45deg);
}

.task-title {
  min-width: 0;
  overflow-wrap: anywhere;
}

.is-complete .task-title {
  color: var(--color-muted);
  text-decoration: line-through;
}

.delete-button {
  padding: 0 8px;
  border: 0;
  background: transparent;
  color: var(--color-danger);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

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

.empty-state {
  padding: 32px 16px 16px;
  text-align: center;
}

.empty-state h3,
.empty-state p {
  margin: 0;
}

.empty-state h3 {
  font-size: 18px;
}

.empty-state p {
  margin-top: 4px;
}

@media (max-width: 639px) {
  body {
    padding: 24px 16px;
  }

  .task-panel {
    padding: 20px 16px;
  }

  .account-row {
    flex-direction: column;
    align-items: stretch;
  }

  .signout-form {
    align-items: flex-start;
    flex-direction: row;
    justify-content: space-between;
    margin-top: 12px;
  }

  .account-email {
    text-align: left;
  }

  .add-form,
  .toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .primary-button {
    width: 100%;
  }

  .toolbar {
    gap: 12px;
  }

  .filters {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .filters a {
    justify-content: center;
    padding: 0 4px;
  }

  .task-row {
    grid-template-columns: 44px minmax(0, 1fr);
  }

  .delete-form {
    grid-column: 2;
  }
}