:root {
  color-scheme: dark;
  --bg: #07101a;
  --bg-accent: #0b1825;
  --surface: #0f1e2e;
  --surface-strong: #162840;
  --text: #dff0ff;
  --muted: #72afd0;
  --line: rgba(90, 170, 220, 0.22);
  --shadow: 0 14px 34px rgba(2, 6, 14, 0.6);
  --forest: #00e066;
  --forest-rgb: 0 224 102;
  --mint: #b8ff44;
  --mint-rgb: 184 255 68;
  --ocean: #18b0ff;
  --ocean-rgb: 24 176 255;
  --sky: #6ad6ff;
  --sky-rgb: 106 214 255;
  --amber: #ffcc22;
  --amber-rgb: 255 204 34;
  --coral: #ff5533;
  --coral-rgb: 255 85 51;
  --label-column-width: 12rem;
  --summary-column-width: 18rem;
  --cell-size: 3rem;
}

@media (prefers-color-scheme: light) {
  :root {
    color-scheme: light;
    --bg: #f7f6f2;
    --bg-accent: #eef2e8;
    --surface: #ffffff;
    --surface-strong: #ffffff;
    --text: #223126;
    --muted: #647064;
    --line: rgba(34, 49, 38, 0.12);
    --shadow: 0 8px 22px rgba(38, 56, 32, 0.08);
    --forest: #2f9f39;
    --forest-rgb: 47 159 57;
    --mint: #7cca50;
    --mint-rgb: 124 202 80;
    --ocean: #3187d8;
    --ocean-rgb: 49 135 216;
    --sky: #5a9fd4;
    --sky-rgb: 90 159 212;
    --amber: #eab63c;
    --amber-rgb: 234 182 60;
    --coral: #ee6d32;
    --coral-rgb: 238 109 50;
  }
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Trebuchet MS", "Gill Sans", "Avenir Next", sans-serif;
  color: var(--text);
  background: var(--bg);
  overflow: hidden;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

#app {
  position: relative;
  z-index: 1;
}

.app-shell {
  width: 100%;
  height: 100vh;
  margin: 0;
  padding: 0;
}

.about-shell {
  height: 100vh;
  padding: 1rem;
  display: grid;
  place-items: center;
  overflow: auto;
}

.about-card {
  width: min(52rem, 100%);
  border: 1px solid var(--line);
  border-radius: 20px;
  background: var(--surface);
  padding: clamp(1rem, 3vw, 2rem);
}

.about-card h1 {
  margin: 0.5rem 0 0;
  font-size: clamp(1.7rem, 4vw, 2.3rem);
}

.about-section {
  margin-top: 1.25rem;
}

.about-section h2 {
  margin: 0;
}

.about-back {
  display: inline-block;
  text-decoration: none;
  margin-top: 1rem;
}

.tracker-header h2,
.empty-card h2 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.4rem);
}

.empty-card p {
  margin: 0.35rem 0 0;
  max-width: 44rem;
  color: var(--muted);
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  color: var(--mint);
}

.primary-button,
.secondary-button,
.ghost-button,
.restore-button {
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 0.72rem 1rem;
  transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
}

.primary-button {
  color: #03110a;
  background: linear-gradient(120deg, rgb(var(--habit-rgb, var(--forest-rgb))), var(--mint));
  border-color: rgba(255, 255, 255, 0.2);
}

.secondary-button {
  color: var(--text);
  background: var(--surface-strong);
  border-color: var(--line);
}

.ghost-button,
.restore-button {
  color: var(--text);
  background: var(--surface-strong);
  border-color: var(--line);
}

.primary-button:hover,
.secondary-button:hover,
.ghost-button:hover,
.restore-button:hover,
.habit-name:hover,
.cell:hover {
  transform: none;
}

.surface-card,
.empty-card,
.archive-card {
  margin-top: 1.25rem;
  padding: 1rem;
  border-radius: 20px;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.editor-panel,
.settings-panel {
  padding: 1rem;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.surface-card {
  margin-top: 0;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  min-height: 100vh;
}

.tracker-header,
.archive-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1rem;
}

.tracker-header {
  z-index: 7;
  padding: 1rem;
  margin-bottom: 0;
  background: var(--surface);
}

.tracker-actions,
.empty-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.tracker-viewport {
  overflow: auto;
  min-height: 0;
  padding-bottom: 6rem;
  display: grid;
  grid-template-columns: max-content auto var(--summary-column-width);
  align-content: start;
}

.date-row {
  display: contents;
}

.date-row-spacer,
.date-cells,
.date-summary-header {
  margin-bottom: 0;
  position: sticky;
  top: 0;
}

.date-cells,
.date-summary-header {
  z-index: 4;
}

.date-row-spacer {
  position: sticky;
  left: 0;
  z-index: 5;
  min-height: calc(var(--cell-size) + 0.65rem);
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.date-summary-header {
  min-height: calc(var(--cell-size) + 0.65rem);
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: end;
  gap: 0.75rem;
  padding: 0.45rem 0.9rem;
  color: var(--muted);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.date-cells {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: var(--cell-size);
  gap: 0;
}

.date-chip {
  width: var(--cell-size);
  min-height: calc(var(--cell-size) + 0.65rem);
  display: grid;
  place-items: center;
  gap: 0.05rem;
  color: var(--muted);
  font-size: 0.62rem;
  text-transform: uppercase;
  border-left: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.date-chip strong {
  font-size: 0.95rem;
  color: var(--text);
}

.habit-rows {
  display: contents;
}

.tracker-viewport .archive-card {
  grid-column: 1 / -1;
  margin: 1rem;
}

.habit-row {
  display: contents;
  padding: 0;
  background: transparent;
  align-items: stretch;
}

.habit-meta {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  gap: 1rem;
  position: sticky;
  left: 0;
  z-index: 3;
  min-height: var(--cell-size);
  min-width: 9.75rem;
  padding: 0 0.9rem;
  border-right: 1px solid var(--line);
  background: var(--surface);
}

.habit-name {
  border: 0;
  background: transparent;
  padding: 0;
  text-align: left;
  font-size: 1rem;
  font-weight: 700;
  white-space: nowrap;
  transition: color 180ms ease;
}

.habit-cells {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: var(--cell-size);
  gap: 0;
  align-self: stretch;
}

.cell {
  width: var(--cell-size);
  height: 100%;
  min-height: var(--cell-size);
  position: relative;
  overflow: hidden;
  border-radius: 0;
  border: 0;
  appearance: none;
  -webkit-appearance: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
  background: rgba(255, 255, 255, 0.07);
}

.cell::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgb(var(--habit-rgb, var(--forest-rgb)) / var(--streak-alpha, 0.46));
  transform: scaleY(0);
  transform-origin: bottom;
  backface-visibility: hidden;
  pointer-events: none;
  transition: background 180ms ease, transform 180ms ease;
}

.cell::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgb(var(--habit-rgb, var(--forest-rgb)) / var(--streak-alpha, 0.46));
  transform: scaleY(0);
  transform-origin: bottom;
  backface-visibility: hidden;
  pointer-events: none;
  transition: background 180ms ease, transform 180ms ease;
}

.cell.is-animating::after,
.cell.is-animating::before,
.cell.is-clearing::before {
  will-change: transform;
}

.cell.is-complete::after {
  transform: scaleY(1);
}

.cell.is-animating:not(.is-complete):not(.is-skipped):not(.is-clearing)::after {
  animation: cell-fill-grow 220ms ease-out forwards;
}

.cell.is-skipped::before {
  transform: scaleY(0.5);
}

.cell.is-skipped::after {
  transform: scaleY(0);
}

.cell.is-skipped.is-animating::before {
  animation: cell-skip-grow 220ms ease-out;
}

.cell.is-skipped.is-draining::before {
  transform: scaleY(1);
  transition: none;
  animation: cell-fill-drain-to-skip 220ms ease-out forwards;
}

.cell.is-skipped.is-draining::after {
  transform: scaleY(0);
  transition: none;
}

.cell.is-clearing::after {
  transform: scaleY(0);
}

.cell.is-clearing::before {
  animation: cell-fill-shrink 200ms ease-in forwards;
}

.cell:focus,
.cell:active {
  outline: none;
}

@keyframes cell-fill-grow {
  from {
    transform: scaleY(0);
  }

  to {
    transform: scaleY(1);
  }
}

@keyframes cell-skip-grow {
  from {
    transform: scaleY(0);
  }

  to {
    transform: scaleY(0.5);
  }
}

@keyframes cell-fill-drain-to-skip {
  from {
    transform: scaleY(1);
  }

  to {
    transform: scaleY(0.5);
  }
}

@keyframes cell-fill-shrink {
  from {
    transform: scaleY(0.5);
  }

  to {
    transform: scaleY(0);
  }
}

.streak-0 {
  --streak-alpha: 0.32;
}

.streak-1 {
  --streak-alpha: 0.44;
}

.streak-2 {
  --streak-alpha: 0.58;
}

.streak-3 {
  --streak-alpha: 0.72;
}

.streak-4 {
  --streak-alpha: 0.86;
}

.color-forest {
  --habit-rgb: var(--forest-rgb);
  color: var(--forest);
}

.habit-summary {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  align-items: center;
  gap: 0.75rem;
  margin: 0;
  min-height: var(--cell-size);
  padding: 0 0.9rem;
  color: var(--muted);
  border-left: 1px solid var(--line);
  background: var(--surface);
}

.habit-summary-value {
  min-width: 0;
  font-size: 1.1rem;
  color: var(--text);
  font-weight: 700;
}

.archive-list {
  display: grid;
  gap: 0.7rem;
}

.archive-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--line);
}

.archive-item strong {
  display: block;
  margin-bottom: 0.15rem;
}

.archive-item span {
  color: var(--muted);
  font-size: 0.95rem;
}

.empty-state {
  display: grid;
}

.empty-card {
  text-align: center;
  padding: 2rem 1rem;
}

.editor-backdrop,
.settings-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(3, 8, 14, 0.6);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity 220ms ease;
}

.editor-backdrop.is-open,
.settings-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
  animation: backdrop-fade-in 220ms ease;
}

.editor-panel,
.settings-panel {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100%;
  margin: 0;
  z-index: 50;
  border-radius: 20px 20px 0 0;
  border-bottom: none;
  padding-bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
  transform: translateY(102%);
  pointer-events: none;
  transition: transform 340ms cubic-bezier(0.22, 1, 0.36, 1);
}

.editor-panel.is-open,
.settings-panel.is-open {
  transform: translateY(0);
  pointer-events: auto;
  animation: panel-slide-up 380ms cubic-bezier(0.22, 1, 0.36, 1);
}

@keyframes backdrop-fade-in {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes panel-slide-up {
  from {
    transform: translateY(102%);
  }

  to {
    transform: translateY(0);
  }
}

@keyframes panel-scale-in {
  from {
    opacity: 0;
    transform: translate(-50%, -50%) scale(0.94) translateY(10px);
  }

  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1) translateY(0);
  }
}

.modal-drag-handle {
  width: 40px;
  height: 4px;
  border-radius: 2px;
  background: var(--line);
  margin: -0.25rem auto 0.9rem;
}

.icon-button {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--muted);
  transition: background 150ms ease, color 150ms ease;
}

.icon-button:hover {
  background: var(--surface-strong);
  color: var(--text);
}

.editor-head,
.editor-actions {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.editor-form {
  display: grid;
  gap: 1rem;
  margin-top: 1rem;
}

.field {
  display: grid;
  gap: 0.45rem;
}

.field input,
.field select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
  color: var(--text);
  background: rgba(255, 255, 255, 0.05);
}

.editor-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  flex-wrap: wrap;
}

.danger-zone {
  display: flex;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.danger-button {
  color: #ff9696;
  background: rgba(255, 92, 92, 0.13);
  border: 1px solid rgba(255, 105, 105, 0.35);
}

.settings-options {
  display: grid;
  gap: 0.9rem;
  margin-top: 1rem;
}

.settings-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

.settings-button {
  justify-content: center;
}

.file-input {
  display: none;
}

.floating-actions {
  position: fixed;
  right: 1rem;
  left: 1rem;
  bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
  z-index: 30;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  pointer-events: none;
}

.floating-actions > * {
  pointer-events: auto;
}

.floating-add-button {
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.4);
}

.floating-settings-button {
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.3);
}

.color-mint {
  --habit-rgb: var(--mint-rgb);
  color: var(--mint);
}

.color-ocean {
  --habit-rgb: var(--ocean-rgb);
  color: var(--ocean);
}

.color-sky {
  --habit-rgb: var(--sky-rgb);
  color: var(--sky);
}

.color-amber {
  --habit-rgb: var(--amber-rgb);
  color: var(--amber);
}

.color-coral {
  --habit-rgb: var(--coral-rgb);
  color: var(--coral);
}

@media (min-width: 760px) {
  .habit-summary {
    justify-content: flex-end;
  }

  .editor-panel,
  .settings-panel {
    top: 50%;
    left: 50%;
    right: auto;
    bottom: auto;
    width: min(27rem, calc(100vw - 2rem));
    border-radius: 20px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 1rem;
    transform: translate(-50%, -50%) scale(0.94);
    opacity: 0;
    transition: transform 280ms cubic-bezier(0.22, 1, 0.36, 1), opacity 220ms ease;
  }

  .editor-panel.is-open,
  .settings-panel.is-open {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    animation: panel-scale-in 300ms cubic-bezier(0.22, 1, 0.36, 1);
  }

  .modal-drag-handle {
    display: none;
  }

  .floating-actions {
    left: auto;
  }
}

@media (max-width: 759px) {
  :root {
    --label-column-width: 9.75rem;
    --summary-column-width: 15rem;
    --cell-size: 3rem;
  }

  body,
  button,
  .hero,
  .surface-card,
  .archive-card,
  .empty-card,
  .habit-row,
  .habit-name,
  .date-row,
  .habit-summary {
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
  }

  body {
    touch-action: manipulation;
  }

  input,
  select,
  textarea {
    -webkit-user-select: text;
    user-select: text;
  }

  .app-shell {
    width: 100%;
    padding-top: 1rem;
  }

  .habit-meta,
  .habit-summary {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
  }

  .empty-card,
  .archive-card {
    margin-left: 1rem;
    margin-right: 1rem;
  }

  .surface-card {
    padding-left: 0;
    padding-right: 0;
    border-left: 0;
    border-right: 0;
    border-radius: 0;
  }

  .tracker-header {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .date-summary-header {
    padding-left: 0.75rem;
    padding-right: 0.75rem;
    font-size: 0.62rem;
  }

  .habit-summary-value {
    font-size: 1rem;
  }
}