:root {
  color-scheme: light dark;
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-subtle: #f1f5f9;
  --text: #17202a;
  --muted: #52606d;
  --border: #cbd5e1;
  --primary: #155e75;
  --primary-hover: #0e4f63;
  --primary-text: #ffffff;
  --danger: #b42318;
  --danger-bg: #fff1f0;
  --danger-text: #ffffff;
  --warning: #8a4b00;
  --warning-bg: #fff8e6;
  --success: #166534;
  --success-bg: #ecfdf3;
  --info-bg: #eaf6fa;
  --focus: #0f7490;
  --radius: 14px;
  --content-width: 840px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", sans-serif;
  font-size: 16px;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  margin: 0;
  padding: env(safe-area-inset-top) 0 calc(6.75rem + env(safe-area-inset-bottom));
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}

button,
input,
select,
textarea {
  font: inherit;
}

button,
select,
input[type="date"],
input[type="number"],
input[type="text"],
input[type="search"],
textarea {
  min-height: 46px;
}

button {
  touch-action: manipulation;
}

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

button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

[hidden] {
  display: none !important;
}

.skip-link {
  position: fixed;
  top: calc(0.5rem + env(safe-area-inset-top));
  left: 0.75rem;
  z-index: 100;
  padding: 0.75rem 1rem;
  transform: translateY(-180%);
  border-radius: 0.5rem;
  background: var(--text);
  color: var(--surface);
}

.skip-link:focus {
  transform: translateY(0);
}

.app-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: 1.15rem 1rem 0.9rem;
}

.app-header h1,
.section-heading h2,
.dialog-header h2 {
  margin: 0;
  line-height: 1.2;
}

.app-header h1 {
  font-size: clamp(1.65rem, 6vw, 2.1rem);
}

.eyebrow,
.section-kicker {
  margin: 0 0 0.2rem;
  color: var(--primary);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.today-label {
  margin: 0;
  color: var(--muted);
  font-weight: 650;
  text-align: right;
}

.main-nav {
  position: sticky;
  top: env(safe-area-inset-top);
  z-index: 20;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: 0.4rem 0.55rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 94%, transparent);
  backdrop-filter: blur(12px);
}

.nav-button {
  min-height: 48px;
  padding: 0.45rem 0.35rem;
  border: 0;
  border-radius: 0.65rem;
  background: transparent;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 700;
}

.nav-button.is-active {
  background: var(--surface);
  color: var(--primary);
  box-shadow: inset 0 0 0 1px var(--border);
}

main {
  width: min(100%, var(--content-width));
  margin: 0 auto;
}

.view {
  padding: 1.1rem 1rem 2rem;
}

.section-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-heading h2 {
  font-size: clamp(1.4rem, 5vw, 1.75rem);
}

.compact-heading {
  margin-bottom: 0.75rem;
}

.compact-heading h2 {
  font-size: 1.28rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.summary-card {
  display: flex;
  min-height: 100px;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-left: 5px solid var(--primary);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-align: left;
}

.summary-card[data-kind="overdue"] {
  border-left-color: var(--danger);
}

.summary-card[data-kind="today"] {
  border-left-color: var(--warning);
}

.summary-card-name {
  font-weight: 750;
}

.summary-card-count {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1;
}

.summary-card:hover,
.summary-card:active {
  border-color: var(--primary);
}

.content-section,
.completed-details,
.settings-card,
.help-content,
.reminder-panel {
  margin-top: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.reminder-panel {
  margin: 0 0 1rem;
  border-left: 5px solid var(--warning);
  background: var(--warning-bg);
}

.completed-details summary {
  min-height: 46px;
  padding: 0.55rem 0;
  cursor: pointer;
  font-weight: 750;
}

.item-list,
.stack-list {
  display: grid;
  gap: 0.75rem;
}

.item-card,
.reminder-card {
  position: relative;
  padding: 0.9rem;
  border: 1px solid var(--border);
  border-left: 5px solid var(--primary);
  border-radius: 0.8rem;
  background: var(--surface);
}

.item-card.is-overdue {
  border-left-color: var(--danger);
}

.item-card.is-due-today {
  border-left-color: var(--warning);
}

.item-card.is-completed {
  border-left-color: var(--success);
  opacity: 0.86;
}

.item-card.is-never-forget {
  border-top: 2px solid var(--danger);
  border-right: 2px solid var(--danger);
  border-bottom: 2px solid var(--danger);
}

.item-card.is-finishing {
  opacity: 0.35;
  transform: translateY(3px);
}

.item-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
}

.item-card h3,
.reminder-card h3 {
  margin: 0;
  font-size: 1.12rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.item-title-button {
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--text);
  font-weight: 750;
  text-align: left;
}

.item-title-button:hover {
  color: var(--primary);
  text-decoration: underline;
}

.item-meta,
.item-date-line,
.reminder-message {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.item-date-line strong {
  color: var(--text);
}

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.65rem;
}

.status-tag {
  display: inline-flex;
  min-height: 30px;
  align-items: center;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface-subtle);
  color: var(--text);
  font-size: 1rem;
  font-weight: 700;
}

.status-tag.danger-tag {
  border-color: #e6a3a0;
  background: var(--danger-bg);
  color: var(--danger);
}

.status-tag.warning-tag {
  border-color: #d8b66d;
  background: var(--warning-bg);
  color: var(--warning);
}

.status-tag.success-tag {
  border-color: #9ed1ad;
  background: var(--success-bg);
  color: var(--success);
}

.card-actions,
.button-row,
.dialog-actions,
.order-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-top: 0.85rem;
}

.primary-button,
.secondary-button,
.danger-button,
.text-button,
.card-button,
.floating-add-button {
  min-height: 46px;
  padding: 0.62rem 0.9rem;
  border-radius: 0.65rem;
  font-weight: 750;
}

.primary-button,
.floating-add-button {
  border: 1px solid var(--primary);
  background: var(--primary);
  color: var(--primary-text);
}

.primary-button:hover,
.floating-add-button:hover {
  background: var(--primary-hover);
}

.secondary-button,
.card-button {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
}

.danger-button {
  border: 1px solid var(--danger);
  background: var(--danger);
  color: var(--danger-text);
}

.text-button {
  border: 0;
  background: transparent;
  color: var(--primary);
}

.compact-button {
  min-height: 44px;
  padding: 0.5rem 0.75rem;
}

.floating-add-button {
  position: fixed;
  right: max(1rem, env(safe-area-inset-right));
  bottom: calc(1rem + env(safe-area-inset-bottom));
  z-index: 30;
  min-height: 56px;
  padding-inline: 1.15rem;
  border-radius: 999px;
  box-shadow: 0 3px 10px rgb(15 23 42 / 18%);
  font-size: 1.05rem;
}

.filter-panel,
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
}

.filter-panel {
  margin-bottom: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.field {
  display: grid;
  align-content: start;
  gap: 0.35rem;
  color: var(--text);
  font-weight: 700;
}

.full-field {
  grid-column: 1 / -1;
  margin-bottom: 0.9rem;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 0.65rem 0.7rem;
  border: 1px solid var(--border);
  border-radius: 0.55rem;
  background: var(--surface);
  color: var(--text);
  font-weight: 500;
}

.field textarea {
  min-height: 112px;
  resize: vertical;
}

.field input[aria-invalid="true"],
.field select[aria-invalid="true"] {
  border: 2px solid var(--danger);
}

.field-error {
  min-height: 1.2rem;
  color: var(--danger);
  font-size: 1rem;
  font-weight: 700;
}

.field-help {
  color: var(--muted);
  font-size: 1rem;
  font-weight: 500;
}

.inset-fields {
  margin: 0.9rem 0;
  padding: 0.9rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  background: var(--surface-subtle);
}

.checkbox-group {
  display: grid;
  gap: 0.45rem;
  margin: 0.9rem 0;
}

.check-field {
  display: flex;
  min-height: 46px;
  align-items: center;
  gap: 0.65rem;
  font-weight: 700;
}

.check-field input {
  width: 1.3rem;
  height: 1.3rem;
  margin: 0;
}

.notice {
  display: grid;
  gap: 0.2rem;
  margin: 0.75rem 0;
  padding: 0.85rem;
  border: 1px solid var(--border);
  border-left-width: 5px;
  border-radius: 0.65rem;
}

.warning-notice {
  border-left-color: var(--warning);
  background: var(--warning-bg);
}

.error-notice {
  border-left-color: var(--danger);
  background: var(--danger-bg);
  color: var(--danger);
}

.info-notice {
  border-left-color: var(--primary);
  background: var(--info-bg);
}

.count-badge {
  display: inline-flex;
  min-width: 2rem;
  min-height: 2rem;
  align-items: center;
  justify-content: center;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--surface-subtle);
  color: var(--text);
  font-weight: 750;
}

.empty-state {
  margin: 0;
  padding: 1rem;
  color: var(--muted);
  text-align: center;
}

.settings-card h3,
.help-content h3 {
  margin: 0 0 0.45rem;
  font-size: 1.18rem;
}

.settings-card > p,
.help-content p {
  margin-top: 0;
}

.order-list {
  display: grid;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.order-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  background: var(--surface-subtle);
}

.order-row-name {
  font-weight: 750;
}

.order-actions {
  flex-wrap: nowrap;
  margin: 0;
}

.order-actions button {
  min-width: 64px;
}

.status-list {
  display: grid;
  gap: 0;
  margin: 0;
}

.status-list > div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}

.status-list > div:last-child {
  border-bottom: 0;
}

.status-list dt {
  color: var(--muted);
}

.status-list dd {
  margin: 0;
  font-weight: 750;
  text-align: right;
}

.help-content li + li {
  margin-top: 0.45rem;
}

.app-dialog {
  width: min(calc(100% - 1.25rem), 680px);
  max-height: calc(100vh - 1.25rem - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  max-height: calc(100dvh - 1.25rem - env(safe-area-inset-top) - env(safe-area-inset-bottom));
  padding: 1rem;
  overflow: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
}

.app-dialog::backdrop {
  background: rgb(15 23 42 / 58%);
}

.dialog-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.dialog-actions {
  position: sticky;
  bottom: -1rem;
  justify-content: flex-end;
  margin: 1rem -1rem -1rem;
  padding: 0.8rem 1rem calc(0.8rem + env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  background: var(--surface);
}

.detail-content {
  display: grid;
  gap: 0;
}

.detail-row {
  display: grid;
  grid-template-columns: minmax(7rem, 0.7fr) minmax(0, 1.5fr);
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--border);
}

.detail-label {
  color: var(--muted);
  font-weight: 650;
}

.detail-value {
  margin: 0;
  overflow-wrap: anywhere;
  white-space: pre-wrap;
}

.restore-summary {
  display: grid;
  gap: 0.65rem;
  padding: 0.8rem;
  border: 1px solid var(--border);
  border-radius: 0.65rem;
  background: var(--surface-subtle);
}

.toast-region {
  position: fixed;
  left: 50%;
  bottom: calc(5.5rem + env(safe-area-inset-bottom));
  z-index: 80;
  width: min(calc(100% - 2rem), 560px);
  transform: translateX(-50%);
  pointer-events: none;
}

.toast {
  margin-top: 0.5rem;
  padding: 0.8rem 1rem;
  border: 1px solid #334155;
  border-radius: 0.65rem;
  background: #17202a;
  color: #ffffff;
  font-weight: 650;
  box-shadow: 0 3px 10px rgb(15 23 42 / 20%);
}

.toast.is-error {
  border-color: #fecaca;
  background: #7f1d1d;
}

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (min-width: 680px) {
  .summary-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .view {
    padding-inline: 1.25rem;
  }
}

@media (max-width: 560px) {
  .app-header {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.25rem;
  }

  .today-label {
    text-align: left;
  }

  .main-nav {
    overflow-x: auto;
  }

  .nav-button {
    font-size: 1rem;
  }

  .filter-panel,
  .form-grid {
    grid-template-columns: 1fr;
  }

  .full-field {
    grid-column: 1;
  }

  .order-row {
    align-items: flex-start;
    flex-direction: column;
  }

  .detail-row {
    grid-template-columns: 1fr;
    gap: 0.2rem;
  }

  .dialog-actions > button {
    flex: 1 1 8rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .item-card {
    transition: opacity 150ms ease, transform 150ms ease;
  }

  .toast {
    animation: toast-in 150ms ease-out;
  }

  @keyframes toast-in {
    from { opacity: 0; transform: translateY(0.4rem); }
    to { opacity: 1; transform: translateY(0); }
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --surface: #172033;
    --surface-subtle: #202b3f;
    --text: #f1f5f9;
    --muted: #c1cad6;
    --border: #526174;
    --primary: #5fc1da;
    --primary-hover: #3ea9c3;
    --primary-text: #071820;
    --danger: #ff9b91;
    --danger-bg: #421e23;
    --danger-text: #23100e;
    --warning: #ffd17a;
    --warning-bg: #3b2b16;
    --success: #86efac;
    --success-bg: #153523;
    --info-bg: #173545;
    --focus: #67e8f9;
  }
}