*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --border: #e2e5ea;
  --text: #1a1d23;
  --text-muted: #6b7280;
  --accent: #3b6cf4;
  --accent-soft: #eef2ff;
  --past-bg: #f3f4f6;
  --weekend-holiday-bg: #fffafa;
  --sat-color: #dc2626;
  --sun-color: #dc2626;
  --holiday-color: #dc2626;
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.05), 0 1px 4px rgba(15, 23, 42, 0.04);
  --radius: 8px;
  --sidebar-width: 280px;
  --header-height: 3.25rem;
  --panel-bg: #fafbfc;
  --workspace-border: #d8dce2;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

html {
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.35;
  min-height: 100vh;
}

.workspace-main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.5rem 0.5rem 1rem;
}

/* Header / workspace chrome */

.workspace-header,
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.header__inner,
.workspace-header__main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.75rem 0.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.workspace-header__sidebar {
  display: none;
}

.panel-title {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.workspace-header__title {
  display: none;
}

.header__actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sync-status {
  font-size: 0.625rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.sync-status--loading,
.sync-status--saving {
  color: var(--text-muted);
}

.sync-status--error {
  color: #dc2626;
}

.view-tabs {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.view-tab {
  border: 1px solid var(--border);
  border-radius: 3px;
  background: transparent;
  color: var(--text-muted);
  font-family: inherit;
  font-size: 0.6875rem;
  font-weight: 600;
  line-height: 1;
  padding: 0.3125rem 0.5rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.view-tab:hover {
  background: #eceef2;
  border-color: #c8cdd5;
}

.view-tab--active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent);
}

.view-panel[hidden] {
  display: none !important;
}

#todo-view:not([hidden]),
#togo-view:not([hidden]) {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 1.25rem;
}

.todo-list,
.togo-list {
  display: flex;
  flex-direction: column;
  gap: 0.125rem;
  width: 100%;
  max-width: 480px;
}

.input-wrap {
  position: relative;
  display: flex;
  align-items: center;
  width: 100%;
}

.input-clear {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1rem;
  height: 1rem;
  border: none;
  border-radius: 2px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.75rem;
  line-height: 1;
  padding: 0;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s, color 0.15s, background 0.15s;
}

.input-wrap:hover .input-clear,
.input-wrap:focus-within .input-clear {
  opacity: 1;
  pointer-events: auto;
}

.input-clear:hover {
  color: var(--text);
  background: #eceef2;
}

.todo-list__input,
.togo-list__input {
  width: 100%;
  height: 1.375rem;
  border: none;
  border-bottom: 1px solid var(--border);
  background: transparent;
  font-family: inherit;
  font-size: 0.8125rem;
  line-height: 1.375rem;
  color: var(--text);
  outline: none;
  padding: 0 1.125rem 0 0;
  margin: 0;
  -webkit-appearance: none;
  appearance: none;
}

.input-wrap:focus-within .todo-list__input,
.input-wrap:focus-within .togo-list__input {
  border-bottom-color: var(--accent);
  background: rgba(59, 108, 244, 0.03);
}

/* Controls */

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
}

.controls__divider {
  color: #c8cdd5;
  font-size: 0.6875rem;
  line-height: 1;
  user-select: none;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.control-group__label {
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--text-muted);
  white-space: nowrap;
}

.stepper {
  display: flex;
  align-items: center;
  gap: 0.0625rem;
}

.stepper__btn {
  width: 1.125rem;
  height: 1.125rem;
  border: 1px solid var(--border);
  border-radius: 3px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.75rem;
  line-height: 1;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

.stepper__btn:hover {
  background: #eceef2;
  border-color: #c8cdd5;
  color: var(--text-muted);
}

.stepper__btn:active {
  transform: scale(0.96);
}

.stepper__value {
  min-width: 1rem;
  text-align: center;
  font-size: 0.6875rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  color: var(--text-muted);
}

/* Calendar grid */

.calendar {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.week-row {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.375rem;
}

.weekday-labels {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.375rem;
  margin-bottom: -0.125rem;
}

.weekday-label {
  text-align: center;
  font-size: 0.625rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  padding: 0;
}

.weekday-label--sat {
  color: var(--sat-color);
}

.weekday-label--sun {
  color: var(--sun-color);
}

.day-cell {
  min-height: 148px;
}

.day-cell--empty {
  min-height: 0;
}

/* Day card */

.day-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 148px;
  --card-padding-x: 0.4375rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.day-card--past {
  background: var(--past-bg);
}

.day-card--sat:not(.day-card--past),
.day-card--sun:not(.day-card--past),
.day-card--holiday:not(.day-card--past) {
  background: var(--weekend-holiday-bg);
}

.day-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.25rem;
  padding: 0.3125rem var(--card-padding-x);
  border-bottom: 1px solid var(--border);
}

.day-card__date {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.day-card--sat .day-card__date {
  color: var(--sat-color);
}

.day-card--sun .day-card__date {
  color: var(--sun-color);
}

.day-card--holiday .day-card__date {
  color: var(--holiday-color);
}

.day-card__badge {
  font-size: 0.5625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.0625rem 0.25rem;
  border-radius: 3px;
  background: var(--accent);
  color: #fff;
  white-space: nowrap;
}

.day-card--today .day-card__badge {
  background: transparent;
  color: var(--accent);
  padding: 0;
}

.day-card__tasks {
  display: flex;
  flex-direction: column;
  gap: 0.0625rem;
  flex: 1;
  padding: 0.125rem var(--card-padding-x) 0.1875rem;
}

.day-card__task {
  width: 100%;
  height: 1.125rem;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 0.75rem;
  line-height: 1.125rem;
  color: var(--text);
  outline: none;
  padding: 0 1rem 0 0;
  margin: 0;
  -webkit-appearance: none;
  appearance: none;
}

.input-wrap:focus-within .day-card__task {
  background: rgba(59, 108, 244, 0.03);
  border-radius: 2px;
}

.sidebar-panel__title {
  display: none;
}

.header--todo-view .controls {
  visibility: hidden;
}

.empty-toggle {
  display: none;
}

@media (min-width: 901px) {
  body {
    height: 100vh;
    overflow: hidden;
  }

  .workspace {
    display: grid;
    grid-template-rows: var(--header-height) 1fr;
    grid-template-columns: minmax(0, 1fr) var(--sidebar-width);
    height: 100vh;
  }

  .workspace-header {
    display: contents;
    position: static;
    border-bottom: none;
    background: transparent;
  }

  .workspace-header__main {
    grid-column: 1;
    grid-row: 1;
    max-width: none;
    margin: 0;
    min-height: var(--header-height);
    background: var(--bg);
    border-bottom: 1px solid var(--workspace-border);
  }

  .workspace-header__title {
    display: block;
    flex-shrink: 0;
  }

  .view-tabs {
    display: none;
  }

  .workspace-header__sidebar {
    display: flex;
    align-items: center;
    grid-column: 2;
    grid-row: 1;
    padding: 0 0.625rem;
    background: var(--bg);
    border-left: 1px solid var(--workspace-border);
    border-bottom: 1px solid var(--workspace-border);
  }

  .workspace-body {
    display: contents;
  }

  .workspace-main {
    grid-column: 1;
    grid-row: 2;
    max-width: none;
    margin: 0;
    min-height: 0;
    overflow-y: auto;
    background: var(--bg);
  }

  .view-tab[data-view="todo"],
  .view-tab[data-view="togo"] {
    display: none;
  }

  .app-sidebar {
    display: flex;
    flex-direction: column;
    gap: 0;
    grid-column: 2;
    grid-row: 2;
    min-height: 0;
    overflow-y: auto;
    background: var(--bg);
    border-left: 1px solid var(--workspace-border);
    padding: 0.5rem 0.625rem 0.75rem;
  }

  .sidebar-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
  }

  .sidebar-panel__title {
    display: block;
    width: 100%;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    text-align: center;
    padding: 0.375rem 0.125rem 0.25rem;
    margin: 0;
  }

  #todo-view:not([hidden]),
  #togo-view:not([hidden]) {
    display: flex !important;
    flex-direction: column;
    align-items: center;
    padding-top: 0;
  }

  #togo-view:not([hidden]) .sidebar-panel__title {
    padding-top: 1.25rem;
  }

  .app-sidebar .todo-list,
  .app-sidebar .togo-list {
    max-width: none;
    width: 100%;
  }

  .app-sidebar .todo-list__input,
  .app-sidebar .togo-list__input {
    font-size: 0.75rem;
    height: 1.25rem;
    line-height: 1.25rem;
  }
}

/* Responsive */

@media (max-width: 900px) {
  .week-row,
  .weekday-labels {
    grid-template-columns: repeat(7, minmax(0, 1fr));
    gap: 0.3125rem;
  }

  .day-card__task,
  .todo-list__input,
  .togo-list__input {
    font-size: 0.6875rem;
  }
}

@media (max-width: 640px) {
  .workspace-main {
    padding: 0.375rem 0.375rem 0.75rem;
  }

  .header__inner,
  .workspace-header__main {
    padding: 0.625rem 0.375rem;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: auto auto;
    align-items: center;
    column-gap: 0.375rem;
    row-gap: 0.5rem;
  }

  .view-tabs {
    grid-column: 1;
    grid-row: 1;
    min-width: 0;
  }

  .empty-toggle {
    grid-column: 2;
    grid-row: 1;
    display: inline-flex;
    align-items: center;
    gap: 0.3125rem;
    align-self: center;
    font-family: inherit;
    font-size: 0.625rem;
    font-weight: 600;
    line-height: 1;
    color: var(--text-muted);
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
  }

  .empty-toggle input {
    width: 0.875rem;
    height: 0.875rem;
    margin: 0;
    accent-color: var(--accent);
    cursor: pointer;
  }

  .header--todo-view .empty-toggle {
    display: none;
  }

  .header__actions {
    grid-column: 1 / -1;
    grid-row: 2;
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.375rem;
  }

  .header__actions .sync-status:not([hidden]) {
    flex: 1 1 100%;
    text-align: right;
  }

  .controls {
    flex: 1 1 100%;
    width: 100%;
    justify-content: flex-end;
  }

  .header--todo-view .controls {
    display: none;
  }

  .header--todo-view .header__actions {
    display: none;
  }

  .calendar--hide-empty .input-wrap--empty:not(:focus-within) {
    display: none;
  }

  .calendar--hide-empty .day-card,
  .calendar--hide-empty .day-cell {
    min-height: auto;
  }

  .week-row {
    grid-template-columns: 1fr;
  }

  .weekday-labels {
    display: none;
  }

  .day-cell--empty {
    display: none;
  }

  .day-card {
    min-height: 132px;
  }
}