:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --border: #d7dbe2;
  --text: #1d2129;
  --muted: #5d6674;
  --soft: #eef1f4;
  --accent: #6f52ed;
  --accent-soft: #eee9ff;
  --done: #d8f2df;
  --done-text: #17462b;
  --danger: #b23a48;
  --progress-low: #d84a4a;
  --progress-mid: #d99a2b;
  --progress-high: #2f9e63;
  --today-bg: #edf4ff;
  --today-line: #7da8e8;
  --off-target: #f7f8fa;
  --shadow: 0 8px 24px rgba(20, 26, 35, 0.06);
}

body.dark {
  --bg: #15171b;
  --card: #202329;
  --border: #3a404b;
  --text: #f3f5f7;
  --muted: #b7bec8;
  --soft: #2b3038;
  --accent: #9a83ff;
  --accent-soft: #31294c;
  --done: #315e42;
  --done-text: #eefcf3;
  --danger: #ff8f9e;
  --progress-low: #ff6b6b;
  --progress-mid: #f2b84b;
  --progress-high: #57c785;
  --today-bg: #26364c;
  --today-line: #76a8ee;
  --off-target: #1b1e23;
  --shadow: none;
}

* { box-sizing: border-box; }
html { color-scheme: light; }
body.dark { color-scheme: dark; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text);
}

button, input, select { font: inherit; }
button { cursor: pointer; }

.app-shell {
  width: min(1180px, calc(100% - 28px));
  margin: 28px auto 48px;
  display: grid;
  gap: 18px;
}

.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.header-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.header-habits-panel,
.progress-panel { padding: 20px; }

h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 6px; font-size: clamp(3.2rem, 5vw, 4.6rem); }
h2 { margin-bottom: 5px; font-size: 1.05rem; }
p { margin-bottom: 0; color: var(--muted); }

.button,
.view-toggle button {
  min-height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 10px 15px;
}

.button.primary {
  border-color: var(--accent);
  background: var(--accent-soft);
  font-weight: 700;
}

.button.square {
  width: 46px;
  padding: 0;
  font-size: 1.7rem;
}

.header-habits-panel {
  display: grid;
  gap: 16px;
}

.header-habits-panel .header-panel {
  padding: 0;
}

.habits-divider {
  height: 1px;
  background: var(--border);
}

.habits-heading {
  align-items: flex-start;
}

.habit-heading-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  flex-wrap: wrap;
}

.compact-button {
  min-height: 38px;
  padding: 7px 11px;
  font-size: .88rem;
}

.habit-editor-area {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.habit-editor-area[hidden] { display: none; }

.habit-editor-list {
  margin-top: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.habit-editor-row {
  display: grid;
  grid-template-columns: minmax(120px, 1fr) minmax(125px, 155px) auto auto auto;
  gap: 6px;
  align-items: center;
  min-width: 0;
  padding: 7px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: color-mix(in srgb, var(--soft) 38%, var(--card));
}

input,
select {
  min-height: 44px;
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  color: var(--text);
  padding: 10px 12px;
}

input::placeholder { color: #8a93a1; opacity: 1; }

.icon-btn,

.icon-btn:disabled {
  cursor: not-allowed;
  opacity: .35;
}

.add-habit-form {
  margin-top: 14px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
  padding: 12px;
  border: 1px dashed var(--border);
  border-radius: 14px;
}

.counter,
.form-message,
.helper-text {
  color: var(--muted);
  font-size: 0.9rem;
}

.form-message { margin-top: 10px; min-height: 1.3em; }

.view-toggle {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--soft);
}

.view-toggle button {
  border: 0;
  border-radius: 0;
  min-width: 92px;
  background: transparent;
  color: var(--muted);
  font-weight: 700;
}

.view-toggle button + button { border-left: 1px solid var(--border); }
.view-toggle button.active { background: var(--card); color: var(--text); }

.period-controls {
  display: flex;
  align-items: center;
  gap: 10px;
}

.period-title {
  min-width: 220px;
  text-align: center;
  font-weight: 800;
  font-size: 1.15rem;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.summary-card { padding: 16px; }
.summary-value { font-size: 1.8rem; font-weight: 800; }
.summary-label { margin-top: 6px; color: var(--muted); font-size: 0.85rem; }

.tracker-wrap {
  overflow-x: auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
}

table {
  width: 100%;
  min-width: max-content;
  border-collapse: separate;
  border-spacing: 0;
}

th, td {
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

th:last-child, td:last-child { border-right: 0; }
tbody tr:last-child td { border-bottom: 0; }

thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  background: var(--card);
}

.day-col {
  position: sticky;
  left: 0;
  z-index: 4;
  min-width: 88px;
  width: 88px;
  background: var(--card);
}

tbody .day-col {
  z-index: 2;
  padding: 7px;
  font-weight: 700;
  color: var(--muted);
}

.today td {
  box-shadow: inset 0 2px 0 var(--today-line), inset 0 -2px 0 var(--today-line);
}

.today .day-col {
  color: var(--text);
  background: var(--today-bg);
}

.today-badge {
  display: inline-block;
  margin-top: 3px;
  padding: 2px 6px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--text);
  font-size: .63rem;
  font-weight: 800;
  letter-spacing: .01em;
}

.habit-head {
  min-width: 124px;
  padding: 10px 8px;
}

.habit-name { font-weight: 800; }

.habit-header-note {
  margin-top: 3px;
  font-size: .66rem;
  line-height: 1.2;
  color: var(--muted);
  font-weight: 650;
  white-space: nowrap;
}

.check-cell {
  min-width: 124px;
  height: 52px;
  padding: 0;
  background: var(--card);
}

.check-cell.off-target { background: var(--off-target); }
.check-cell.off-target .check-btn { opacity: .52; }

.check-cell.done {
  background: var(--done);
  color: var(--done-text);
}

.check-cell.done .check-btn { opacity: 1; }

.check-btn {
  width: 100%;
  height: 52px;
  border: 0;
  background: transparent;
  color: inherit;
  font-size: 1.4rem;
  font-weight: 900;
}

.helper-text { margin: 8px 4px 0; }

.habit-stat-list {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.habit-stat { padding: 14px; }
.habit-stat strong { display: block; margin-bottom: 5px; }
.habit-stat .small { color: var(--muted); font-size: 0.82rem; line-height: 1.45; }
.habit-target-label { color: var(--muted); font-size: .76rem; margin-top: 3px; }

.progress {
  height: 8px;
  margin-top: 10px;
  background: var(--soft);
  border-radius: 999px;
  overflow: hidden;
}

.progress > span {
  display: block;
  height: 100%;
  border-radius: inherit;
  transition: width 160ms ease;
}

.progress-low > span { background: var(--progress-low); }
.progress-mid > span { background: var(--progress-mid); }
.progress-high > span { background: var(--progress-high); }

.empty-note { color: var(--muted); }
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 42%, transparent);
  outline-offset: 2px;
}

@media (max-width: 980px) {

  .habit-editor-list { grid-template-columns: 1fr; }
  .habit-editor-row {
    grid-template-columns: minmax(0, 1fr) minmax(145px, 180px) auto auto auto;
  }
}

@media (max-width: 800px) {
  .summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .habit-stat-list { grid-template-columns: 1fr; }
  .habit-editor-row {
    grid-template-columns: minmax(0, 1fr) auto auto auto;
  }
  .habit-editor-row select { grid-column: 1 / -1; grid-row: 2; }
}

@media (max-width: 640px) {
  .app-shell { width: min(100% - 18px, 1180px); margin-top: 12px; gap: 12px; }
  .header-panel,
  .habits-panel,
  .progress-panel { padding: 14px; }
  .add-habit-form { grid-template-columns: 1fr; }
  .period-controls { order: 3; width: 100%; justify-content: space-between; }
  .period-title { min-width: 0; flex: 1; }
  .button.secondary { width: auto; }
  .habit-head,
  .check-cell { min-width: 108px; }

  .habit-heading-actions { width: 100%; justify-content: flex-start; }
  .counter { margin-right: auto; }
  .habit-editor-row {
    grid-template-columns: minmax(0, 1fr) repeat(3, 44px);
  }
}

@media (max-width: 430px) {

  .compact-button { flex: 1 1 auto; }
}

/* v1.4: archive + month comparison */
.archive-btn {
  min-height: 44px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card);
  color: var(--muted);
  padding: 0 11px;
  font-weight: 700;
}

.archive-btn:hover { color: var(--text); }

.archived-habits-area {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
}

.archived-habits-area[hidden] { display: none; }

.archived-heading-row h3 {
  margin: 0 0 4px;
  font-size: .95rem;
}

.archived-heading-row p {
  font-size: .82rem;
}

.archived-habit-list {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.archived-habit-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 8px 7px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--soft) 48%, var(--card));
}

.archived-habit-name {
  font-size: .82rem;
  font-weight: 700;
}

.restore-btn {
  min-height: 32px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  padding: 4px 9px;
  font-size: .76rem;
  font-weight: 700;
}

.summary-comparison {
  margin-top: 7px;
  font-size: .78rem;
  font-weight: 700;
  color: var(--muted);
}

.comparison-positive { color: var(--progress-high); }
.comparison-negative { color: var(--progress-low); }
.comparison-neutral { color: var(--muted); }

.habit-comparison {
  margin-top: 5px;
  font-size: .76rem;
  font-weight: 650;
}

@media (max-width: 800px) {
  .archive-btn {
    grid-column: 1 / -1;
    min-height: 38px;
  }
}

/* v1.5: backup, restore and reset */
.data-panel {
  overflow: hidden;
}

.data-panel > summary {
  min-height: 54px;
  display: flex;
  align-items: center;
  padding: 0 20px;
  cursor: pointer;
  font-weight: 800;
  list-style: none;
  user-select: none;
}

.data-panel > summary::-webkit-details-marker { display: none; }

.data-panel > summary::after {
  content: '+';
  margin-left: auto;
  color: var(--muted);
  font-size: 1.25rem;
  font-weight: 600;
}

.data-panel[open] > summary::after { content: '−'; }
.data-panel[open] > summary { border-bottom: 1px solid var(--border); }

.data-panel-body {
  padding: 18px 20px 20px;
}

.data-panel-body h2,
.data-panel-body h3 {
  margin: 0 0 4px;
}

.data-panel-body h3 { font-size: .95rem; }

.data-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.data-divider {
  height: 1px;
  background: var(--border);
  margin: 18px 0;
}

.reset-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}

.reset-row .data-actions { margin-top: 0; }

.danger-button {
  color: var(--danger);
  border-color: color-mix(in srgb, var(--danger) 45%, var(--border));
  background: color-mix(in srgb, var(--danger) 8%, var(--card));
  font-weight: 700;
}

@media (max-width: 640px) {
  .data-panel > summary { padding: 0 14px; }
  .data-panel-body { padding: 14px; }
  .data-actions { width: 100%; }
  .data-actions .button { flex: 1 1 auto; }
}

@media (display-mode: standalone) {
  .app-shell {
    margin-top: max(14px, env(safe-area-inset-top));
    padding-bottom: max(0px, env(safe-area-inset-bottom));
  }
}

.view-toggle {
  border-radius: 10px;
}

.view-toggle button {
  min-width: 78px;
  min-height: 38px;
  padding: 7px 13px;
  font-size: .9rem;
}

.view-toggle button.active {
  background: var(--accent-soft);
  color: var(--text);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 30%, transparent);
}

.period-controls { gap: 7px; }

.period-title {
  min-width: 205px;
  font-size: 1.08rem;
  letter-spacing: -.01em;
}

.tracker-wrap {
  border-radius: 14px;
  box-shadow: 0 5px 18px rgba(20, 26, 35, 0.05);
}

body.dark .tracker-wrap { box-shadow: none; }

thead th {
  background: color-mix(in srgb, var(--soft) 60%, var(--card));
}

.day-col {
  min-width: 78px;
  width: 78px;
}

thead .day-col {
  color: var(--muted);
  font-size: .82rem;
  letter-spacing: .01em;
}

tbody .day-col {
  padding: 6px 7px;
  font-size: .9rem;
}

.habit-head {
  min-width: 118px;
  padding: 8px 8px 9px;
}

.habit-name {
  font-size: .93rem;
  letter-spacing: -.005em;
}

.habit-header-note {
  margin-top: 2px;
  font-size: .62rem;
}

.check-cell {
  min-width: 118px;
  height: 48px;
}

.check-btn {
  height: 48px;
  font-size: 1.32rem;
  transition: background-color 120ms ease, transform 90ms ease;
}

.check-btn:active { transform: scale(.985); }

.check-cell:not(.done) .check-btn:hover {
  background: color-mix(in srgb, var(--soft) 55%, transparent);
}

.check-cell.done {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--done-text) 12%, transparent);
}

.today td {
  box-shadow: inset 0 1px 0 var(--today-line), inset 0 -1px 0 var(--today-line);
}

.today .day-col {
  box-shadow: inset 3px 0 0 var(--today-line), inset 0 1px 0 var(--today-line), inset 0 -1px 0 var(--today-line);
}

.today-badge {
  margin-top: 2px;
  padding: 1px 5px;
  font-size: .6rem;
}

.helper-text {
  margin: 6px 3px 0;
  font-size: .78rem;
  line-height: 1.35;
}

@media (max-width: 640px) {
  .view-toggle { align-self: flex-start; }
  .view-toggle button { min-width: 72px; min-height: 36px; }

  .period-controls {
    order: 3;
    width: 100%;
    justify-content: center;
    padding-top: 1px;
  }

  .period-title { min-width: 0; max-width: 235px; flex: 1; }

  .habit-head,
  .check-cell { min-width: 104px; }

  .day-col { min-width: 70px; width: 70px; }
  .check-cell,
  .check-btn { height: 46px; }
}

@media (hover: none) {
  .check-cell:not(.done) .check-btn:hover { background: transparent; }
}

/* v1.6.6 trust + clarity pass */

.habit-head,
.check-cell {
  width: 118px;
  min-width: 118px;
  max-width: 118px;
}

.habit-head {
  vertical-align: middle;
}

.habit-head .habit-name {
  font-size: .95rem;
  line-height: 1.2;
}

.check-cell.future {
  background: color-mix(in srgb, var(--soft) 78%, var(--card));
}

.check-cell.future .check-btn {
  cursor: not-allowed;
  opacity: .28;
}

.future-row .day-col {
  color: color-mix(in srgb, var(--muted) 70%, transparent);
  background: color-mix(in srgb, var(--soft) 62%, var(--card));
}

.check-cell.missed:not(.off-target) {
  background: color-mix(in srgb, var(--danger) 5%, var(--card));
}

.check-cell.missed:not(.off-target) .check-btn::after {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: color-mix(in srgb, var(--danger) 45%, transparent);
  display: inline-block;
}

.today .check-cell:not(.done):not(.off-target) {
  background: color-mix(in srgb, var(--today-bg) 70%, var(--card));
}

.pace-label {
  font-weight: 800;
}

.pace-label.progress-high { color: var(--progress-high); }
.pace-label.progress-mid { color: var(--progress-mid); }
.pace-label.progress-low { color: var(--progress-low); }
.pace-label.progress-neutral { color: var(--muted); }

.progress.progress-neutral > span {
  background: var(--muted);
}

.streak-line {
  margin-top: 2px;
}

@media (max-width: 640px) {
  .habit-head,
  .check-cell {
    width: 104px;
    min-width: 104px;
    max-width: 104px;
  }
}

.tracker-wrap {
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
}

@media (max-width: 640px) {
  .tracker-wrap {
    border-radius: 13px;
  }

  .habit-head,
  .check-cell {
    width: 78px;
    min-width: 78px;
    max-width: 78px;
  }

  .habit-head {
    padding: 7px 4px;
  }

  .habit-head .habit-name {
    font-size: .8rem;
    line-height: 1.1;
    overflow-wrap: anywhere;
  }

  .habit-header-note {
    font-size: .56rem;
    white-space: normal;
  }

  .day-col {
    width: 64px;
    min-width: 64px;
    max-width: 64px;
  }

  tbody .day-col {
    padding: 4px 3px;
    font-size: .78rem;
  }

  .check-cell,
  .check-btn {
    height: 40px;
  }

  .check-btn {
    font-size: 1.2rem;
  }

  .today-badge {
    padding: 1px 4px;
    font-size: .52rem;
  }
}

@media (max-width: 640px) {
  .header-panel {
    position: static;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    padding-right: 0 !important;
  }

  .header-actions {
    position: static;
    display: flex;
    align-items: center;
    justify-content: flex-start;
    gap: 8px;
  }

  .icon-button {
    width: 40px;
    min-width: 40px;
    min-height: 40px;
  }

  .icon-button svg {
    width: 18px;
    height: 18px;
  }

  #themeToggle {
    position: static;
    width: 40px;
    min-width: 40px;
    min-height: 40px;
    padding: 0;
    overflow: hidden;
    white-space: nowrap;
    font-size: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  #themeToggle::before {
    content: '🌙';
    font-size: 1.2rem;
    line-height: 1;
  }

  body.dark #themeToggle::before {
    content: '☀️';
  }
}

.heatmap-panel {
  padding: 20px;
  overflow: hidden;
}

.heatmap-heading-row,
.heatmap-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.heatmap-heading-row {
  margin-bottom: 16px;
}

.heatmap-heading-row select {
  min-width: 235px;
  min-height: 40px;
  padding: 7px 34px 7px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--text);
  font-weight: 650;
}

.heatmap-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-x: contain;
  padding: 2px 2px 8px;
}

.heatmap-grid {
  --heat-cell: 13px;
  display: grid;
  grid-template-columns: 36px repeat(var(--heatmap-weeks), var(--heat-cell));
  grid-template-rows: 20px repeat(7, var(--heat-cell));
  gap: 4px;
  width: max-content;
  min-width: 100%;
  align-items: center;
}

.heatmap-month {
  align-self: end;
  color: var(--muted);
  font-size: .72rem;
  font-weight: 750;
  white-space: nowrap;
  transform: translateX(-1px);
}

.heatmap-weekday {
  color: var(--muted);
  font-size: .68rem;
  font-weight: 700;
  text-align: right;
  padding-right: 5px;
  line-height: var(--heat-cell);
}

.heatmap-cell,
.heat-level {
  width: var(--heat-cell, 13px);
  height: var(--heat-cell, 13px);
  border-radius: 3px;
  border: 1px solid color-mix(in srgb, var(--border) 72%, transparent);
}

.heatmap-cell {
  padding: 0;
  min-height: 0;
  background: var(--soft);
  cursor: pointer;
}

.heatmap-cell:hover:not(:disabled) {
  outline: 2px solid color-mix(in srgb, var(--accent) 50%, transparent);
  outline-offset: 1px;
}

.heatmap-cell:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  z-index: 2;
}

.heatmap-cell.heatmap-outside {
  border-color: transparent;
  background: transparent;
  cursor: default;
}

.heat-level-0 { background: var(--soft); }
.heat-level-1 { background: color-mix(in srgb, var(--progress-high) 18%, var(--card)); border-color: transparent; }
.heat-level-2 { background: color-mix(in srgb, var(--progress-high) 38%, var(--card)); border-color: transparent; }
.heat-level-3 { background: color-mix(in srgb, var(--progress-high) 64%, var(--card)); border-color: transparent; }
.heat-level-4 { background: var(--progress-high); border-color: transparent; }

.heatmap-today {
  outline: 2px solid var(--today-line);
  outline-offset: 1px;
}

.heatmap-footer {
  margin-top: 10px;
}

.heatmap-summary {
  color: var(--muted);
  font-size: .86rem;
  font-weight: 550;
}

.heatmap-legend {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--muted);
  font-size: .75rem;
  white-space: nowrap;
}

.heatmap-legend .heat-level {
  --heat-cell: 12px;
  display: inline-block;
}

@media (max-width: 640px) {
  .heatmap-panel { padding: 16px 14px; }
  .heatmap-heading-row { align-items: stretch; margin-bottom: 12px; }
  .heatmap-filter-label { width: 100%; }
  .heatmap-heading-row select { width: 100%; min-width: 0; }
  .heatmap-grid { --heat-cell: 12px; gap: 3px; }
  .heatmap-footer { align-items: flex-start; }
  .heatmap-summary { width: 100%; }
}

/* Keep the table structure for alignment, but inset each interactive cell so
   the check-ins read as individual keys rather than one continuous grid. */
tbody .check-cell {
  padding: 3px;
  background: transparent !important;
  border-right-color: transparent;
  border-bottom-color: transparent;
  box-shadow: none !important;
}

.check-cell .check-btn {
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card);
  color: var(--text);
  box-shadow: 0 1px 1px color-mix(in srgb, #000 7%, transparent);
}

body.dark .check-cell .check-btn {
  box-shadow: inset 0 1px 0 color-mix(in srgb, #fff 4%, transparent);
}

.check-cell.done .check-btn {
  background: var(--done);
  color: var(--done-text);
  border-color: color-mix(in srgb, var(--done-text) 16%, var(--done));
}

.check-cell.off-target .check-btn {
  background: var(--off-target);
}

.check-cell.future .check-btn {
  background: color-mix(in srgb, var(--soft) 78%, var(--card));
  border-color: color-mix(in srgb, var(--border) 65%, transparent);
}

.check-cell.missed:not(.off-target) .check-btn {
  background: color-mix(in srgb, var(--danger) 5%, var(--card));
  border-color: color-mix(in srgb, var(--danger) 12%, var(--border));
}

.today .check-cell:not(.done):not(.off-target) .check-btn {
  background: color-mix(in srgb, var(--today-bg) 72%, var(--card));
  border-color: color-mix(in srgb, var(--today-line) 55%, var(--border));
}

.check-cell:not(.done) .check-btn:hover {
  background: color-mix(in srgb, var(--soft) 60%, var(--card));
}

/* Preserve the highlighted Today row without drawing a continuous line
   through the chiclet gaps. */
.today .check-cell {
  box-shadow: none !important;
}

@media (max-width: 640px) {
  tbody .check-cell {
    padding: 2px;
  }

  .check-cell .check-btn {
    height: 36px;
    border-radius: 7px;
  }
}

@media (max-width: 640px) {
  .habit-editor-area {
    margin-top: 10px;
    padding-top: 10px;
  }

  .habit-editor-list {
    gap: 7px;
  }

  .habit-editor-row {
    grid-template-columns: minmax(0, 1fr) minmax(104px, 118px) 40px 40px 72px;
    gap: 5px;
    padding: 6px;
    border-radius: 12px;
  }

  .habit-editor-row input,
  .habit-editor-row select,
  .habit-editor-row .icon-btn,
  .habit-editor-row .archive-btn {
    min-height: 40px;
    height: 40px;
  }

  .habit-editor-row input,
  .habit-editor-row select {
    padding: 7px 9px;
  }

  .habit-editor-row select {
    grid-column: auto;
    grid-row: auto;
    font-size: .88rem;
  }

  .habit-editor-row .icon-btn {
    min-width: 40px;
    width: 40px;
    padding: 0;
  }

  .habit-editor-row .archive-btn {
    grid-column: auto;
    min-width: 0;
    padding: 0 7px;
    font-size: .78rem;
  }
}

@media (max-width: 430px) {
  .habit-editor-row {
    grid-template-columns: minmax(0, 1fr) 40px 40px;
    grid-template-rows: 40px 40px;
    gap: 5px;
  }

  .habit-editor-row input {
    grid-column: 1;
    grid-row: 1;
  }

  .habit-editor-row .icon-btn:nth-of-type(1) {
    grid-column: 2;
    grid-row: 1;
  }

  .habit-editor-row .icon-btn:nth-of-type(2) {
    grid-column: 3;
    grid-row: 1;
  }

  .habit-editor-row select {
    grid-column: 1 / 3;
    grid-row: 2;
  }

  .habit-editor-row .archive-btn {
    grid-column: 3;
    grid-row: 2;
    font-size: 0;
    padding: 0;
  }

  .habit-editor-row .archive-btn::before {
    content: "Archive";
    font-size: .68rem;
  }

  .add-habit-form {
    margin-top: 10px;
    padding: 8px;
    gap: 7px;
  }
}

.starter-hint {
  margin-top: 2px;
  padding: 9px 11px;
  border-radius: 11px;
  background: color-mix(in srgb, var(--accent-soft) 55%, var(--card));
  color: var(--muted);
  font-size: .82rem;
}

.day-note-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  min-height: 0;
  margin: 3px auto 0;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--muted);
  font-size: .65rem;
  line-height: 1;
}

.day-note-btn.has-note {
  color: var(--accent);
}

.heatmap-detail {
  margin: 4px 0 12px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: color-mix(in srgb, var(--soft) 52%, var(--card));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.heatmap-detail[hidden] { display: none; }

.heatmap-detail-copy {
  min-width: 0;
  display: grid;
  gap: 2px;
}

.heatmap-detail-copy strong { font-size: .86rem; }
.heatmap-detail-copy span { color: var(--muted); font-size: .78rem; }

.heatmap-detail-actions {
  display: flex;
  gap: 6px;
  flex: 0 0 auto;
}

.archived-habit-item {
  border-radius: 12px;
}

.archived-habit-history {
  color: var(--muted);
  font-size: .72rem;
}

/* Keep habit names visible while vertically scrolling the tracker on mobile. */
@media (max-width: 640px) {
  .tracker-wrap thead th {
    position: sticky;
    top: 0;
    z-index: 7;
  }

  .tracker-wrap thead .day-col {
    left: 0;
    z-index: 9;
  }

  .heatmap-detail {
    align-items: stretch;
    flex-direction: column;
  }

  .heatmap-detail-actions .button {
    flex: 1;
  }
}

.tracker-wrap tbody tr.today-row .day-col {
  background: color-mix(in srgb, var(--accent-soft) 76%, var(--card));
  color: var(--text);
  box-shadow: inset 3px 0 0 var(--accent);
}

.tracker-wrap tbody tr.today-row .check-cell {
  background: color-mix(in srgb, var(--accent-soft) 76%, var(--card));
}

.tracker-wrap tbody tr.today-row .check-cell.done,
.tracker-wrap tbody tr.today-row .check-cell.future,
.tracker-wrap tbody tr.today-row .check-cell.missed:not(.off-target),
.tracker-wrap tbody tr.today-row .check-cell.off-target {
  background: color-mix(in srgb, var(--accent-soft) 76%, var(--card));
}

.tracker-wrap tbody tr.today-row .check-btn {
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--accent) 18%, transparent);
}

.tracker-wrap tbody tr.today-row .check-cell.done .check-btn {
  border-color: color-mix(in srgb, var(--done-text) 38%, var(--border));
  box-shadow: 0 0 0 1px color-mix(in srgb, var(--done-text) 14%, transparent);
}

.today-badge {
  display: inline-flex;
  margin-top: 4px;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: .64rem;
  font-weight: 800;
  letter-spacing: .02em;
  line-height: 1.35;
}

@media (max-width: 640px) {
  .tracker-wrap tbody tr.today-row .day-col {
    box-shadow: inset 3px 0 0 var(--accent);
  }

  .today-badge {
    padding: 2px 6px;
    font-size: .6rem;
  }
}

.tracker-wrap tbody tr.today-row td,
.tracker-wrap tbody tr.today-row th {
  border-top-color: color-mix(in srgb, var(--accent) 22%, var(--border));
  border-bottom-color: color-mix(in srgb, var(--accent) 22%, var(--border));
}

.tracker-wrap tbody tr.today-row {
  background: color-mix(in srgb, var(--accent-soft) 76%, var(--card));
}

.tracker-wrap tbody tr.today-row td:not(.day-col),
.tracker-wrap tbody tr.today-row th:not(.day-col) {
  background: color-mix(in srgb, var(--accent-soft) 76%, var(--card));
}

/* v1.7.1: responsive containment
   Keep wide tracker/heatmap content inside their own horizontal scrollers
   instead of allowing them to widen the whole page. */
html,
body {
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
}

.app-shell {
  min-width: 0;
  max-width: 100%;
}

.app-shell > *,
.app-shell > section,
.panel,
.header-habits-panel,
.progress-panel,
.summary-grid,
.data-panel {
  min-width: 0;
  max-width: 100%;
}

.tracker-wrap,
.heatmap-scroll {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior-inline: contain;
  scrollbar-width: thin;
}

.tracker-wrap table {
  width: max-content;
  min-width: 100%;
}

.heatmap-panel,
.heatmap-heading-row,
.heatmap-footer,
.heatmap-detail,
.heatmap-detail-copy {
  min-width: 0;
  max-width: 100%;
}

.heatmap-summary,
.progress-panel p,
.helper-text,
.header-panel p,
.habits-heading p {
  overflow-wrap: anywhere;
}

@media (max-width: 640px) {
  .app-shell {
    width: calc(100% - 16px);
    margin-left: auto;
    margin-right: auto;
  }

  .tracker-wrap {
    /* 7–8 habits intentionally scroll within the grid; the page itself does not. */
    touch-action: pan-x pan-y;
  }

  .heatmap-scroll {
    touch-action: pan-x pan-y;
  }

  .header-habits-panel,
  .heatmap-panel,
  .progress-panel,
  .data-panel {
    width: 100%;
  }

  .period-controls {
    min-width: 0;
  }

  .period-title {
    overflow-wrap: anywhere;
  }
}

/* Dashboard: brand, habit management and tracker navigation */
.top-dashboard-panel {
  gap: 10px;
  padding: 14px 16px;
}

.compact-brand-row {
  align-items: flex-start;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-button {
  width: 48px;
  min-width: 48px;
  min-height: 48px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.icon-button svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

#shareBtn.is-success {
  border-color: var(--accent);
  color: var(--accent);
}


.compact-brand-row h1 {
  margin-bottom: 3px;
  font-size: clamp(2.25rem, 3.6vw, 3.25rem);
  line-height: 1;
}

.compact-brand-row .brand-copy {
  min-width: 0;
  flex: 1 1 520px;
}

.compact-brand-row .brand-copy p {
  max-width: 820px;
  font-size: .9rem;
  line-height: 1.3;
}

.dashboard-utility-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  align-items: center;
}

.habits-compact-block {
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.habits-compact-copy {
  min-width: 0;
}

.habits-compact-copy h2 {
  margin: 0 0 2px;
  font-size: 1rem;
}

.habits-compact-copy p {
  font-size: .82rem;
  white-space: nowrap;
}

.habit-heading-actions {
  flex-wrap: nowrap;
  gap: 10px;
}

#editHabitsBtn {
  min-width: 124px;
}

.tracker-controls-inline {
  min-width: 0;
  display: grid;
  grid-template-columns: auto minmax(260px, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding-top: 9px;
  border-top: 1px solid var(--border);
}

.tracker-controls-inline .period-controls {
  min-width: 0;
  justify-content: center;
}

.tracker-controls-inline .period-title {
  min-width: 0;
  width: clamp(190px, 20vw, 280px);
  font-size: .95rem;
  font-weight: 800;
}

.tracker-controls-inline .view-toggle button {
  min-width: 76px;
}

.tracker-controls-inline .button.square {
  width: 38px;
  min-height: 38px;
  font-size: 1.4rem;
}

.tracker-controls-inline .today-inline {
  min-height: 38px;
  padding: 7px 11px;
}

@media (max-width: 640px) {
  .top-dashboard-panel {
    padding: 10px 12px;
    gap: 8px;
  }

  .compact-brand-row {
    min-height: 42px;
    display: flex;
    align-items: flex-start;
    padding-right: 0 !important;
  }

  .compact-brand-row h1 {
    margin: 0;
    font-size: clamp(1.72rem, 8vw, 2.2rem);
    line-height: 1.02;
  }

  .compact-brand-row .brand-copy p {
    display: none;
  }

  #themeToggle {
    width: 40px;
    min-width: 40px;
    min-height: 40px;
  }

  .habits-divider {
    margin: 0;
  }

  .habits-compact-block {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 8px;
  }

  .habits-compact-copy {
    display: flex;
    align-items: baseline;
    gap: 8px;
  }

  .habits-compact-copy h2 {
    margin: 0;
    font-size: .92rem;
  }

  .habits-compact-copy p {
    display: none;
  }

  .habit-heading-actions {
    width: auto;
    display: flex;
    align-items: center;
    gap: 7px;
  }

  .counter {
    margin: 0;
    font-size: .76rem;
    white-space: nowrap;
  }

  #editHabitsBtn {
    min-width: 0;
    min-height: 36px;
    padding: 6px 9px;
    font-size: .78rem;
  }

  .tracker-controls-inline {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-areas: "toggle period today";
    gap: 7px;
    padding-top: 8px;
  }

  .tracker-controls-inline .view-toggle {
    grid-area: toggle;
    justify-self: start;
  }

  .tracker-controls-inline .period-controls {
    grid-area: period;
    width: 100%;
    justify-content: center;
    gap: 5px;
  }

  .tracker-controls-inline .today-inline {
    grid-area: today;
    min-height: 36px;
    padding: 6px 9px;
    font-size: .78rem;
  }

  .tracker-controls-inline .view-toggle button {
    min-width: 54px;
    min-height: 36px;
    padding: 6px 9px;
    font-size: .78rem;
  }

  .tracker-controls-inline .button.square {
    width: 34px;
    min-height: 34px;
    font-size: 1.25rem;
  }

  .tracker-controls-inline .period-title {
    width: auto;
    max-width: 150px;
    font-size: .82rem;
    line-height: 1.15;
    white-space: nowrap;
  }
}

@media (max-width: 470px) {
  .tracker-controls-inline {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "toggle today"
      "period period";
    row-gap: 6px;
  }

  .tracker-controls-inline .period-controls {
    justify-content: space-between;
  }

  .tracker-controls-inline .period-title {
    max-width: none;
    text-align: center;
  }

  .habits-compact-copy h2 {
    display: none;
  }
}


/* v1.8.6: repair compact mobile header layout */
@media (max-width: 640px) {
  .header-panel.compact-brand-row {
    display: grid !important;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    column-gap: 10px;
    row-gap: 0;
    min-height: 0;
    padding-right: 0 !important;
  }

  .compact-brand-row .brand-copy {
    flex: none;
    width: auto;
    min-width: 0;
  }

  .compact-brand-row .brand-copy p {
    display: none;
  }

  .compact-brand-row h1 {
    margin: 0;
    font-size: clamp(1.62rem, 7vw, 2rem);
    line-height: 1;
    white-space: nowrap;
  }

  .header-actions {
    position: static;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    margin: 0;
  }

  .header-actions .icon-button,
  .header-actions #themeToggle {
    width: 38px;
    min-width: 38px;
    height: 38px;
    min-height: 38px;
    padding: 0;
  }

  .header-actions .icon-button svg {
    width: 17px;
    height: 17px;
  }
}

@media (max-width: 400px) {
  .compact-brand-row h1 {
    font-size: 1.48rem;
  }

  .header-actions .icon-button,
  .header-actions #themeToggle {
    width: 36px;
    min-width: 36px;
    height: 36px;
    min-height: 36px;
  }
}


/* v1.8.7: keep theme toggle icon-only at all viewport sizes */
#themeToggle {
  width: 48px;
  min-width: 48px;
  height: 48px;
  min-height: 48px;
  padding: 0;
  overflow: hidden;
  white-space: nowrap;
  font-size: 0;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

#themeToggle::before {
  content: '🌙';
  font-size: 1.3rem;
  line-height: 1;
}

body.dark #themeToggle::before {
  content: '☀️';
}

@media (max-width: 640px) {
  #themeToggle {
    width: 38px;
    min-width: 38px;
    height: 38px;
    min-height: 38px;
  }

  #themeToggle::before {
    font-size: 1.05rem;
  }
}

@media (max-width: 400px) {
  #themeToggle {
    width: 36px;
    min-width: 36px;
    height: 36px;
    min-height: 36px;
  }
}