:root {
  color-scheme: light dark;
  --page-bg: #E5E1D6;
  --paper: #F1EEE6;
  --paper-line: #CFC7B4;
  --ink: #26314B;
  --ink-soft: #5A6480;
  --seal: #B23A2E;
  --daily-mark: #3F6659;
  --focus-ring: #3D6FE0;
  --priority-low: #3A6EA5;
  --page-shadow: 0 12px 30px -18px rgba(38, 49, 75, 0.4);
}

/* dark theme follows the OS/browser preference, no manual toggle */
@media (prefers-color-scheme: dark) {
  :root {
    --page-bg: #14120F;
    --paper: #201D18;
    --paper-line: #3A362E;
    --ink: #E7E2D3;
    --ink-soft: #A79E8C;
    --seal: #D2574A;
    --daily-mark: #5C9184;
    --focus-ring: #6C93F2;
    --priority-low: #7FA6D6;
    --page-shadow: 0 12px 30px -18px rgba(0, 0, 0, 0.7);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  background: var(--page-bg);
  color: var(--ink);
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  padding: 2.5rem 1rem;
}

.page {
  width: 100%;
  max-width: 26rem;
  background: var(--paper);
  border: 1px solid var(--paper-line);
  border-radius: 2px;
  box-shadow: 0 1px 0 var(--paper-line), var(--page-shadow);
  padding: 1.75rem 1.5rem 1.5rem;
}

.page-header {
  border-bottom: 1px solid var(--paper-line);
  padding-bottom: 0.9rem;
  margin-bottom: 1.1rem;
}

.title {
  font-family: "Shippori Mincho", serif;
  font-weight: 700;
  font-size: 1.6rem;
  margin: 0;
  letter-spacing: 0.01em;
}

.jp { margin-right: 0.5rem; }

.date {
  margin: 0.3rem 0 0;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.list-section { margin-bottom: 1.1rem; }

.list-section h2 {
  font-family: "Shippori Mincho", serif;
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink-soft);
  margin: 0 0 0.4rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--paper-line);
}

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

.task-row {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--paper-line);
}

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

@media (prefers-reduced-motion: no-preference) {
  .task-row.row-enter { animation: row-enter-kf 0.22s ease-out; }
  .task-row.row-exit {
    animation: row-exit-kf 0.18s ease-in forwards;
    pointer-events: none;
  }
}

@keyframes row-enter-kf {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes row-exit-kf {
  from { opacity: 1; transform: scale(1); }
  to { opacity: 0; transform: scale(0.96) translateX(6px); }
}

.task-priority {
  flex: none;
  width: 1.5rem;
  border: none;
  background: none;
  padding: 0.2rem 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  line-height: 1;
  color: var(--ink-soft);
  text-align: center;
}

.task-priority[data-priority="high"] { color: var(--seal); }
.task-priority[data-priority="low"] { color: var(--priority-low); }

.task-priority:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

.task-check {
  appearance: none;
  width: 1.35rem;
  height: 1.35rem;
  flex: none;
  border: 1.5px solid var(--ink-soft);
  border-radius: 50%;
  cursor: pointer;
  position: relative;
}

.task-check:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.task-check::after {
  content: "";
  position: absolute;
  inset: 3px;
  border-radius: 50%;
  background: var(--seal);
  transform: scale(0);
}

.task-check:checked::after { transform: scale(1); }

@media (prefers-reduced-motion: no-preference) {
  .task-check::after { transition: transform 0.18s ease-out; }
  .task-title { transition: color 0.15s ease, text-decoration-color 0.15s ease; }
}

.task-row[data-type="daily"] .task-check { border-color: var(--daily-mark); }
.task-row[data-type="daily"] .task-check::after { background: var(--daily-mark); }

.task-title {
  flex: 1;
  font-size: 1rem;
  line-height: 1.3;
}

.task-check:checked ~ .task-title {
  color: var(--ink-soft);
  text-decoration: line-through;
  text-decoration-color: var(--paper-line);
}

.task-edit {
  flex: none;
  border: none;
  background: none;
  color: var(--ink-soft);
  font-size: 0.95rem;
  line-height: 1;
  padding: 0.25rem 0.35rem;
  cursor: pointer;
  opacity: 0.7;
}

.task-edit:hover { opacity: 1; color: var(--focus-ring); }

.task-edit:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

.task-delete {
  flex: none;
  border: none;
  background: none;
  color: var(--ink-soft);
  font-size: 1.1rem;
  line-height: 1;
  padding: 0.25rem 0.4rem;
  cursor: pointer;
}

.task-delete:hover { color: var(--seal); }

.task-delete:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

.task-row-editing { padding: 0.5rem 0; }

.edit-form {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
}

.edit-title-input {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--paper-line);
  background: transparent;
  font-size: 1rem;
  padding: 0.2rem 0.1rem;
  color: var(--ink);
  font-family: inherit;
}

.edit-title-input:focus-visible {
  outline: none;
  border-bottom-color: var(--focus-ring);
}

.edit-type {
  display: flex;
  gap: 0.9rem;
  font-size: 0.85rem;
  color: var(--ink-soft);
}

.edit-type label {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  cursor: pointer;
}

.edit-actions {
  display: flex;
  gap: 0.7rem;
}

.edit-actions button {
  border: none;
  background: none;
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.2rem 0;
}

.edit-actions button[type="submit"] {
  color: var(--focus-ring);
  font-weight: 600;
}

.edit-actions button[type="button"] { color: var(--ink-soft); }

.empty-note {
  color: var(--ink-soft);
  font-size: 0.9rem;
  font-style: italic;
  margin: 0.4rem 0;
}

.all-done-note {
  font-family: "Shippori Mincho", serif;
  color: var(--ink-soft);
  font-size: 0.95rem;
  text-align: center;
  margin: 0 0 1.1rem;
}

@media (prefers-reduced-motion: no-preference) {
  .all-done-note:not([hidden]) { animation: fade-in 0.4s ease-out; }
}

@keyframes fade-in {
  from { opacity: 0; transform: translateY(-2px); }
  to { opacity: 1; transform: translateY(0); }
}

.confetti-piece {
  position: fixed;
  width: 5px;
  height: 9px;
  pointer-events: none;
  z-index: 1000;
  animation: confetti-burst 0.65s ease-out forwards;
}

@keyframes confetti-burst {
  from { transform: translate(0, 0) rotate(0deg); opacity: 1; }
  to { transform: translate(var(--dx), var(--dy)) rotate(var(--rot)); opacity: 0; }
}

.add-form {
  border-top: 1px solid var(--paper-line);
  padding-top: 1rem;
  margin-top: 0.4rem;
}

#add-input {
  width: 100%;
  border: none;
  border-bottom: 1px solid var(--paper-line);
  background: transparent;
  font-size: 1rem;
  padding: 0.4rem 0.1rem;
  color: var(--ink);
  font-family: inherit;
}

#add-input:focus-visible {
  outline: none;
  border-bottom-color: var(--focus-ring);
}

.add-controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.7rem;
  flex-wrap: wrap;
}

.type-choice {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
  cursor: pointer;
}

.type-choice input:focus-visible { outline: 2px solid var(--focus-ring); }

.add-controls button {
  margin-left: auto;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  cursor: pointer;
  border-radius: 2px;
}

.add-controls button:hover { background: var(--ink-soft); border-color: var(--ink-soft); }

.add-controls button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.page-footer {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
}

.link-button {
  border: none;
  background: none;
  color: var(--ink-soft);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0;
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

.file-label { display: inline-flex; }

.history-panel, .settings-panel {
  border-top: 1px solid var(--paper-line);
  margin-top: 1rem;
  padding-top: 1rem;
}

.settings-row {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

#reset-time-input {
  border: 1px solid var(--paper-line);
  background: transparent;
  color: var(--ink);
  font-family: inherit;
  font-size: 1rem;
  padding: 0.3rem 0.5rem;
  border-radius: 2px;
}

#reset-time-input:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 1px;
}

.settings-hint {
  color: var(--ink-soft);
  font-size: 0.8rem;
  margin: 0.4rem 0 0;
}

.history-panel h2, .history-panel h3, .settings-panel h2 {
  font-family: "Shippori Mincho", serif;
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0 0 0.5rem;
}

.habit-history {
  margin-bottom: 0.7rem;
}

.habit-history-title {
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.habit-dots {
  display: flex;
  gap: 0.25rem;
}

.habit-dot {
  width: 0.6rem;
  height: 0.6rem;
  border-radius: 50%;
  border: 1px solid var(--paper-line);
  background: transparent;
}

.habit-dot.done {
  background: var(--daily-mark);
  border-color: var(--daily-mark);
}

.history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 0.9rem;
}

.history-list li {
  display: flex;
  justify-content: space-between;
  padding: 0.3rem 0;
  border-bottom: 1px dashed var(--paper-line);
  color: var(--ink-soft);
}

.history-list li:last-child { border-bottom: none; }

.history-date { font-variant-numeric: tabular-nums; }

@media (max-width: 400px) {
  .page { padding: 1.4rem 1.1rem 1.2rem; }
}