:root {
  --canvas: #f3f1ea;
  --surface: #fffefa;
  --surface-soft: #f5f8f5;
  --text: #17211e;
  --muted: #62706b;
  --line: #d7ded9;
  --line-strong: #a8b6b0;
  --accent: #087f68;
  --accent-strong: #055d4c;
  --accent-soft: #ddf2ec;
  --spark: #e9784f;
  --spark-soft: #fff0e9;
  --danger: #a3382c;
  --danger-soft: #fff1ef;
  --shadow: 0 16px 40px rgba(23, 33, 30, 0.08);
  --radius-lg: 22px;
  --radius-md: 15px;
  --radius-sm: 10px;
  --copy-font: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --number-font: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  color: var(--text);
  background: var(--canvas);
  font-family: var(--copy-font);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 92% 0, rgba(8, 127, 104, 0.12), transparent 26rem),
    linear-gradient(135deg, rgba(233, 120, 79, 0.05), transparent 38rem),
    var(--canvas);
}

button,
input {
  font: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

.page-shell {
  width: min(100%, 1232px);
  min-height: 100dvh;
  margin: 0 auto;
  padding:
    max(12px, env(safe-area-inset-top))
    max(16px, env(safe-area-inset-right))
    max(24px, env(safe-area-inset-bottom))
    max(16px, env(safe-area-inset-left));
}

.calculator-panel {
  display: grid;
  min-width: 0;
  gap: 12px;
}

.tool-bar,
.distance-card,
.metric-card,
.result-card,
.projection-strip,
.split-builder {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.tool-bar {
  position: relative;
  overflow: hidden;
  padding: 12px 14px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.tool-bar::before {
  position: absolute;
  inset: 0 auto 0 0;
  width: 5px;
  background: linear-gradient(180deg, var(--accent) 0 66%, var(--spark) 66%);
  content: "";
}

.tool-bar__top {
  display: flex;
  gap: 14px;
  align-items: center;
  justify-content: space-between;
}

.tool-bar__heading {
  min-width: 0;
}

.title-block h1 {
  margin: 0;
  font-size: clamp(1.3rem, 2.4vw, 1.65rem);
  line-height: 1.05;
  letter-spacing: -0.04em;
}

.product-intro {
  margin: 3px 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.3;
}

.tool-bar__actions {
  display: flex;
  flex-wrap: wrap;
  flex: 0 0 auto;
  gap: 6px;
  align-items: center;
  justify-content: flex-end;
}

.support-link,
.segmented__button,
.ghost-button,
.chip-button,
.split-action-button,
.split-card,
.split-card__action {
  min-width: 44px;
  min-height: 44px;
}

.support-link {
  display: inline-flex;
  gap: 7px;
  align-items: center;
  justify-content: center;
  padding: 8px 13px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 750;
  line-height: 1;
  text-decoration: none;
}

.segmented {
  display: inline-flex;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface-soft);
}

.segmented__button,
.ghost-button,
.chip-button,
.split-action-button,
.split-card,
.split-card__action {
  border: 1px solid var(--line);
  color: var(--text);
  cursor: pointer;
}

.segmented__button,
.ghost-button,
.chip-button {
  padding: 7px 11px;
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.75rem;
  font-weight: 720;
}

.segmented__button {
  min-width: 44px;
  border-color: transparent;
  text-transform: uppercase;
}

.segmented__button.is-active,
.chip-button.is-active,
.chip-button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.16);
}

.ghost-button {
  background: transparent;
}

.distance-card,
.metric-card,
.result-card,
.split-builder {
  padding: 14px;
}

.distance-card,
.metric-grid {
  align-self: start;
}

.metric-grid {
  display: grid;
  min-width: 0;
  gap: 12px;
}

.metric-card {
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.metric-card--source {
  border-color: #89c5b7;
  box-shadow: inset 4px 0 0 var(--accent);
}

.metric-card--derived {
  border-color: #9ecfc3;
  background: linear-gradient(135deg, var(--accent-soft), var(--surface) 72%);
  box-shadow: inset 4px 0 0 var(--spark);
}

.metric-card--idle {
  background: var(--surface);
}

.metric-card__head,
.split-builder__head {
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
}

.metric-card__title {
  min-width: 0;
  padding-inline-start: 0.5rem;
}

.metric-card__title h2,
.metric-card__summary,
.split-builder__title h2,
.result-card h2 {
  margin: 0;
  letter-spacing: -0.025em;
}

.metric-card__title h2,
.split-builder__title h2,
.result-card h2 {
  font-size: 1rem;
}

.metric-card__summary {
  margin-top: 1px;
  font-family: var(--number-font);
  font-size: 1.15rem;
  font-weight: 750;
}

.eyebrow,
.field > span,
.projection-chip span,
.split-card__metric-label {
  color: var(--muted);
  font-size: 0.66rem;
  font-weight: 780;
  letter-spacing: 0.085em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0 0 2px;
  color: var(--accent-strong);
}

.distance-adjustments,
.preset-row {
  display: grid;
  gap: 5px;
}

.distance-adjustments {
  grid-template-columns: repeat(4, minmax(44px, 1fr));
}

.preset-row {
  grid-template-columns: repeat(7, minmax(44px, 1fr));
}

.chip-button--increment {
  min-width: 58px;
  padding-inline: 7px;
  font-size: 0.7rem;
}

.distance-card__body,
.field,
.rate-grid {
  display: grid;
}

.distance-card__body {
  grid-template-columns: minmax(120px, 0.8fr) minmax(0, 2.2fr);
  gap: 8px 10px;
  margin-top: 10px;
}

.field--distance {
  grid-row: 1 / span 2;
}

.preset-row {
  grid-column: 2;
}

.distance-slider {
  grid-column: 2;
}

#distance-error {
  grid-column: 1 / -1;
}

.rate-grid {
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 8px;
  margin-top: 10px;
}

.time-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 7px;
  margin-top: 10px;
}

.field {
  min-width: 0;
  gap: 4px;
}

.field-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.rate-field {
  padding: 7px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface-soft);
}

.rate-field.field--active {
  border-color: #89c5b7;
  background: var(--accent-soft);
}

.rate-field.field--linked > span::after {
  content: " · linked";
  color: var(--accent-strong);
  letter-spacing: 0;
  text-transform: none;
}

input {
  width: 100%;
  min-width: 0;
  min-height: 48px;
  padding: 9px 10px;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font-size: 1rem;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
}

#distance-input,
#speed-input,
#time-hours,
#time-minutes,
#time-seconds,
#pace-minutes,
#pace-seconds,
.projection-chip strong,
.split-card__metric-value {
  font-family: var(--number-font);
}

input:hover {
  border-color: #758982;
}

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

input[aria-invalid="true"] {
  border-color: var(--danger);
  background: var(--danger-soft);
}

.field-error {
  min-height: 0;
  margin: 0;
  color: transparent;
  font-size: 0.75rem;
  line-height: 1.2;
}

.field-error:empty {
  display: none;
}

.field-error.is-visible {
  display: block;
  color: var(--danger);
}

.distance-slider {
  min-height: 44px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  appearance: none;
}

.distance-slider::-webkit-slider-runnable-track {
  height: 7px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #9ed2c6);
}

.distance-slider::-moz-range-track {
  height: 7px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), #9ed2c6);
}

.distance-slider::-webkit-slider-thumb {
  width: 24px;
  height: 24px;
  margin-top: -8px;
  border: 3px solid var(--surface);
  border-radius: 50%;
  background: var(--accent-strong);
  box-shadow: 0 0 0 1px var(--accent-strong);
  appearance: none;
}

.distance-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border: 3px solid var(--surface);
  border-radius: 50%;
  background: var(--accent-strong);
  box-shadow: 0 0 0 1px var(--accent-strong);
}

.result-card {
  position: relative;
  align-self: stretch;
  overflow: hidden;
  border-color: #8fc7ba;
  background:
    linear-gradient(145deg, var(--accent-soft), var(--surface) 66%);
}

.result-card::after {
  position: absolute;
  top: -28px;
  right: -28px;
  width: 76px;
  height: 76px;
  border: 10px solid rgba(233, 120, 79, 0.2);
  border-radius: 50%;
  content: "";
}

.status-message {
  min-height: 1.3em;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.3;
}

.status-message:empty {
  display: none;
}

.status-message--error {
  color: var(--danger);
}

.result-card__label {
  margin: 14px 0 3px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 780;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.result-card__value {
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--accent-strong);
  font-family: var(--number-font);
  font-size: clamp(1.85rem, 3.7vw, 2.8rem);
  font-weight: 850;
  letter-spacing: -0.06em;
  line-height: 1;
}

.result-card__detail {
  margin: 6px 0 0;
  color: var(--text);
  font-size: 0.82rem;
  line-height: 1.35;
}

.result-card__rule {
  height: 1px;
  margin: 12px 0;
  background: var(--line);
}

.result-card__hint {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

.projection-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  background: var(--line);
}

.projection-chip {
  display: grid;
  min-width: 0;
  gap: 3px;
  padding: 9px 7px;
  background: var(--surface);
  text-align: center;
}

.projection-chip strong {
  min-width: 0;
  overflow: hidden;
  font-size: clamp(0.7rem, 1.25vw, 0.84rem);
  text-overflow: ellipsis;
  white-space: nowrap;
}

.split-builder {
  display: grid;
  gap: 9px;
}

.split-builder__title {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  align-items: baseline;
}

.split-builder__summary,
.split-empty-state {
  margin: 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

.split-action-button {
  padding: 8px 14px;
  border-color: var(--accent);
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 750;
}

.split-action-button--save {
  background: var(--accent-strong);
}

.split-action-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.split-list {
  display: grid;
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.split-list__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  min-width: 0;
  gap: 6px;
  align-items: center;
}

.split-card {
  display: flex;
  min-width: 0;
  gap: 8px;
  align-items: center;
  padding: 5px 9px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  text-align: left;
}

.split-card.is-selected {
  border-color: var(--accent);
  box-shadow: inset 4px 0 0 var(--accent);
}

.split-card__index {
  display: inline-flex;
  width: 26px;
  height: 26px;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
}

.split-card__metrics {
  display: grid;
  min-width: 0;
  flex: 1;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
}

.split-card__metric {
  display: flex;
  min-width: 0;
  gap: 4px;
  align-items: center;
  justify-content: center;
}

.split-card__metric-label {
  color: var(--accent-strong);
  font-size: 0.58rem;
}

.split-card__metric-value {
  min-width: 0;
  overflow: hidden;
  font-size: 0.74rem;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.split-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.split-card__action {
  display: inline-flex;
  inline-size: 44px;
  block-size: 44px;
  align-items: center;
  justify-content: center;
  padding: 0;
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.split-card__action:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.split-card__action--danger {
  border-color: #e1b8b2;
  color: var(--danger);
}

.split-card__action-icon {
  inline-size: 18px;
  block-size: 18px;
  stroke-width: 1.5;
  pointer-events: none;
}

@media (min-width: 700px) {
  .page-shell {
    padding-inline: 24px;
  }

  .calculator-panel {
    grid-template-columns: minmax(0, 7fr) minmax(280px, 5fr);
    gap: 12px;
  }

  .tool-bar,
  .metric-grid,
  .projection-strip,
  .split-builder {
    grid-column: 1 / -1;
  }

  .distance-card {
    grid-column: 1;
    grid-row: 2;
  }

  .result-card {
    grid-column: 2;
    grid-row: 2;
  }

  .metric-grid {
    grid-row: 3;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .metric-card {
    height: 100%;
  }

  .projection-strip {
    grid-row: 4;
  }

  .split-builder {
    grid-row: 5;
  }

  .distance-card__body {
    grid-template-columns: 1fr;
  }

  .field--distance,
  .preset-row,
  .distance-slider,
  #distance-error {
    grid-column: 1;
    grid-row: auto;
  }

  .preset-row {
    grid-template-columns: repeat(4, minmax(44px, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-shell {
    padding-block-start: 18px;
  }

  .calculator-panel {
    grid-template-columns: minmax(0, 7fr) minmax(320px, 5fr);
    gap: 14px;
  }

  .tool-bar,
  .split-builder {
    grid-column: 1 / -1;
  }

  .distance-card {
    grid-column: 1;
    grid-row: 2;
  }

  .result-card {
    grid-column: 2;
    grid-row: 2;
  }

  .metric-grid {
    grid-column: 1;
    grid-row: 3;
  }

  .projection-strip {
    grid-column: 2;
    grid-row: 3;
    align-self: start;
  }

  .split-builder {
    grid-column: 1 / -1;
    grid-row: 4;
  }

  .distance-card__body {
    grid-template-columns: minmax(120px, 0.8fr) minmax(0, 2.2fr);
  }

  .field--distance {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .preset-row {
    grid-column: 2;
    grid-row: 1;
    grid-template-columns: repeat(7, minmax(44px, 1fr));
  }

  .distance-slider {
    grid-column: 2;
    grid-row: 2;
  }

  #distance-error {
    grid-column: 1 / -1;
  }
}

@media (max-width: 699px) {
  .tool-bar__top {
    align-items: stretch;
    flex-direction: column;
  }

  .tool-bar__actions {
    justify-content: flex-start;
  }

  .support-link {
    margin-inline-start: auto;
  }

  .distance-card__body {
    grid-template-columns: 1fr;
  }

  .field--distance,
  .preset-row,
  .distance-slider,
  #distance-error {
    grid-column: 1;
    grid-row: auto;
  }

  .preset-row {
    grid-template-columns: repeat(4, minmax(44px, 1fr));
  }

  .rate-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(104px, 1fr);
  }

  .result-card {
    order: 4;
  }

  .projection-strip {
    order: 5;
  }

  .split-builder {
    order: 6;
  }

  .split-list__item {
    grid-template-columns: 1fr;
  }

  .split-card__actions {
    justify-content: flex-end;
  }
}

@media (max-width: 420px) {
  .page-shell {
    padding-inline: 10px;
  }

  .calculator-panel {
    gap: 9px;
  }

  .tool-bar,
  .distance-card,
  .metric-card,
  .result-card,
  .split-builder {
    padding: 11px;
  }

  .tool-bar__top {
    gap: 8px;
  }

  .tool-bar__actions {
    display: grid;
    grid-template-columns: auto auto minmax(44px, 1fr);
    width: 100%;
  }

  .support-link {
    min-width: 44px;
    margin: 0;
    padding-inline: 11px;
  }

  .support-link span {
    font-size: 1rem;
  }

  .distance-card .metric-card__head {
    display: grid;
    align-items: start;
  }

  .distance-adjustments {
    width: 100%;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .chip-button--increment {
    min-width: 44px;
    padding-inline: 2px;
    font-size: 0.66rem;
  }

  .preset-row {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .preset-row .chip-button {
    min-width: 44px;
    padding-inline: 4px;
    font-size: 0.7rem;
  }

  .rate-grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(96px, 0.9fr);
    gap: 5px;
  }

  .rate-field {
    padding: 5px;
  }

  .field-pair {
    gap: 4px;
  }

  input {
    padding-inline: 7px;
  }

  .projection-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .projection-chip {
    padding-inline: 3px;
  }

  .split-builder__head {
    align-items: stretch;
    flex-direction: column;
  }

  .split-action-button {
    width: 100%;
  }

  .split-card {
    align-items: flex-start;
  }

  .split-card__metrics {
    grid-template-columns: 1fr;
  }

  .split-card__metric {
    justify-content: flex-start;
  }
}

@media (max-width: 350px) {
  .support-link {
    font-size: 0;
  }

  .support-link span {
    font-size: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}