:root {
  --bg-top: #f7efe0;
  --bg-bottom: #ead9be;
  --panel: rgba(255, 250, 242, 0.94);
  --panel-strong: rgba(255, 255, 255, 0.9);
  --line: rgba(49, 41, 28, 0.12);
  --line-strong: rgba(49, 41, 28, 0.22);
  --text: #31291c;
  --muted: #72624a;
  --accent: #bb5d2a;
  --accent-soft: rgba(187, 93, 42, 0.14);
  --source: rgba(24, 97, 76, 0.12);
  --source-line: rgba(24, 97, 76, 0.3);
  --derived: rgba(190, 108, 31, 0.14);
  --derived-line: rgba(190, 108, 31, 0.3);
  --danger: #9d3f22;
  --danger-soft: rgba(157, 63, 34, 0.08);
  --save-accent: #2f7c67;
  --save-soft: rgba(47, 124, 103, 0.14);
  --shadow: 0 18px 40px rgba(49, 41, 28, 0.12);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --copy-font: "Avenir Next", "Segoe UI", sans-serif;
  --display-font: "Avenir Next Condensed", "Trebuchet MS", "Gill Sans", sans-serif;
  --number-font: "SFMono-Regular", "Menlo", monospace;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(255, 255, 255, 0.72), transparent 32%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
}

.page-shell {
  width: min(460px, 100%);
  min-height: 100dvh;
  margin: 0 auto;
  padding:
    max(4px, env(safe-area-inset-top))
    6px
    max(4px, env(safe-area-inset-bottom));
}

.calculator-panel {
  display: grid;
  gap: 4px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.tool-bar,
.distance-card,
.metric-card,
.projection-chip {
  border: 1px solid var(--line);
  background: var(--panel-strong);
}

.tool-bar,
.distance-card,
.metric-card {
  border-radius: var(--radius-md);
}

.tool-bar {
  padding: 4px 6px;
}

.tool-bar__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 5px;
  align-items: start;
}

.tool-bar__heading {
  display: grid;
  min-width: 0;
  gap: 2px;
}

.title-block {
  display: flex;
  align-items: center;
  min-width: 0;
}

.metric-card__title {
  display: grid;
  gap: 1px;
  min-width: 0;
  padding-inline-start: 0.55rem;
}

.metric-card__title--solo {
  gap: 0;
}

.title-block h1,
.metric-card__title h2,
.metric-card__summary,
.projection-chip strong {
  margin: 0;
}

.title-block h1,
.metric-card__title h2,
.metric-card__summary {
  font-family: var(--display-font);
  letter-spacing: -0.03em;
}

.title-block h1 {
  font-size: 0.96rem;
  line-height: 1;
}

.metric-card__title h2 {
  font-size: 0.92rem;
  line-height: 1;
}

.metric-card__summary {
  font-size: 1.16rem;
  line-height: 0.92;
}

.eyebrow,
.field span,
.segmented__button,
.chip-button,
.ghost-button,
.projection-chip span,
.split-card__action,
.split-card__index,
.split-card__metric-label,
.split-card__unit {
  font-family: var(--display-font);
  font-size: 0.58rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  white-space: nowrap;
}

.status-message,
.field-error {
  margin: 0;
  font-size: 0.76rem;
  line-height: 1.3;
}

.status-message {
  min-width: 0;
  color: var(--muted);
  font-size: 0.64rem;
  line-height: 1.2;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  white-space: normal;
}

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

.status-message--error,
.field-error.is-visible {
  color: var(--danger);
}

.distance-card,
.metric-card {
  display: grid;
  gap: 4px;
  padding: 5px;
}

.distance-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(249, 241, 229, 0.92));
}

.metric-card {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(249, 244, 238, 0.9));
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.metric-card--source {
  border-color: var(--source-line);
  background:
    linear-gradient(180deg, var(--source), rgba(255, 255, 255, 0.92) 82%);
  box-shadow: inset 3px 0 0 rgba(24, 97, 76, 0.88);
}

.metric-card--derived {
  border-color: var(--derived-line);
  background:
    linear-gradient(180deg, var(--derived), rgba(255, 252, 248, 0.92) 82%);
  box-shadow: inset 3px 0 0 rgba(190, 108, 31, 0.88);
}

.metric-card--idle {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.76), rgba(250, 245, 238, 0.86));
}

.metric-card__head {
  display: grid;
  gap: 3px;
}

.distance-card .metric-card__head {
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px;
  align-items: start;
}

.distance-adjustments {
  display: flex;
  flex-wrap: nowrap;
  gap: 3px;
  align-items: center;
  justify-content: flex-end;
  justify-self: end;
}

.distance-card__body {
  display: grid;
  gap: 5px;
}

.metric-grid {
  display: grid;
  gap: 5px;
}

.rate-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.95fr);
  gap: 4px;
}

.time-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 4px;
}

.field {
  display: grid;
  gap: 2px;
  min-width: 0;
}

.field span {
  color: var(--text);
  transition: color 160ms ease;
}

.field-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
}

.field-error {
  min-height: 1.05em;
  color: transparent;
}

.rate-field {
  padding: 3px;
  border: 1px solid transparent;
  border-radius: calc(var(--radius-sm) + 2px);
  background: rgba(255, 255, 255, 0.34);
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    box-shadow 160ms ease;
}

.rate-field.field--active {
  border-color: rgba(255, 255, 255, 0.92);
  background: rgba(255, 255, 255, 0.58);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.84);
}

.rate-field.field--linked {
  border-color: rgba(49, 41, 28, 0.08);
  background: rgba(113, 98, 74, 0.06);
}

.rate-field.field--linked span {
  color: var(--muted);
}

input {
  width: 100%;
  min-height: 36px;
  padding: 6px 8px;
  border: 1px solid rgba(49, 41, 28, 0.12);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.92);
  color: var(--text);
  font: inherit;
  font-size: 1rem;
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  transition:
    background-color 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    box-shadow 160ms ease;
}

.rate-field.field--active input {
  background: rgba(255, 255, 255, 0.97);
}

.rate-field.field--linked input {
  border-color: rgba(49, 41, 28, 0.09);
  background: rgba(227, 221, 213, 0.8);
  color: rgba(49, 41, 28, 0.84);
}

.rate-field.field--linked input::placeholder {
  color: rgba(114, 98, 74, 0.72);
}

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

input:focus-visible,
button:focus-visible {
  outline: 2px solid rgba(187, 93, 42, 0.28);
  outline-offset: 2px;
}

input:focus-visible {
  border-color: rgba(187, 93, 42, 0.56);
}

input[aria-invalid="true"] {
  border-color: rgba(157, 63, 34, 0.56);
  background: rgba(255, 245, 240, 0.96);
}

.tool-bar__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  align-items: center;
  justify-content: flex-end;
}

.segmented {
  display: inline-flex;
  gap: 2px;
  padding: 2px;
  border-radius: 999px;
  background: rgba(49, 41, 28, 0.05);
}

.segmented__button,
.ghost-button {
  min-height: 28px;
  padding: 4px 8px;
  border: 1px solid rgba(49, 41, 28, 0.12);
  border-radius: 999px;
  color: var(--text);
  cursor: pointer;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.chip-button {
  min-height: 30px;
  padding: 5px 8px;
  border: 1px solid rgba(49, 41, 28, 0.12);
  border-radius: 999px;
  color: var(--text);
  cursor: pointer;
  white-space: nowrap;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.segmented__button,
.chip-button {
  background: rgba(255, 255, 255, 0.9);
}

.chip-button--increment {
  min-height: 27px;
  padding-inline: 7px;
  border-color: rgba(187, 93, 42, 0.18);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(250, 236, 221, 0.94));
  font-size: 0.52rem;
  letter-spacing: 0.08em;
}

.ghost-button {
  background: transparent;
}

.segmented__button:hover,
.segmented__button:focus-visible,
.chip-button:hover,
.chip-button:focus-visible,
.ghost-button:hover,
.ghost-button:focus-visible {
  transform: translateY(-1px);
  border-color: var(--line-strong);
}

.segmented__button.is-active,
.chip-button.is-active,
.chip-button[aria-pressed="true"] {
  background: var(--text);
  color: #fff9f2;
}

.ghost-button:hover,
.ghost-button:focus-visible {
  background: rgba(49, 41, 28, 0.05);
}

.preset-row {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 3px;
}

.preset-row .chip-button {
  width: 100%;
  min-width: 0;
}

.distance-slider {
  width: 100%;
  appearance: none;
  height: 8px;
  border-radius: 999px;
  background:
    linear-gradient(90deg, rgba(24, 97, 76, 0.22), rgba(187, 93, 42, 0.28));
  cursor: pointer;
}

.distance-slider::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background: transparent;
}

.distance-slider::-moz-range-track {
  height: 8px;
  border: 0;
  border-radius: 999px;
  background: transparent;
}

.distance-slider::-webkit-slider-thumb {
  appearance: none;
  width: 20px;
  height: 20px;
  margin-top: -5px;
  border: 0;
  border-radius: 50%;
  background: var(--text);
  box-shadow: 0 8px 16px rgba(49, 41, 28, 0.18);
}

.distance-slider::-moz-range-thumb {
  width: 20px;
  height: 20px;
  border: 0;
  border-radius: 50%;
  background: var(--text);
  box-shadow: 0 8px 16px rgba(49, 41, 28, 0.18);
}

.projection-strip {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 2px;
}

.projection-chip {
  display: grid;
  gap: 2px;
  padding: 4px;
  border-radius: var(--radius-sm);
}

.projection-chip span {
  color: var(--muted);
}

.projection-chip strong {
  font-size: 0.72rem;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.split-builder {
  display: grid;
  gap: 5px;
  padding: 5px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(248, 240, 228, 0.92));
}

.split-builder__head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 5px;
  align-items: center;
}

.split-builder__title {
  display: flex;
  align-items: baseline;
  gap: 6px;
  min-width: 0;
}

.split-builder__title h2,
.split-builder__summary,
.split-empty-state {
  margin: 0;
}

.split-builder__title h2 {
  font-family: var(--display-font);
  font-size: 0.94rem;
  letter-spacing: -0.03em;
}

.split-builder__summary,
.split-empty-state {
  color: var(--muted);
  font-size: 0.66rem;
  line-height: 1.1;
}

.split-builder__summary {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.split-action-button {
  min-height: 32px;
  padding: 7px 11px;
  border: 1px solid rgba(49, 41, 28, 0.14);
  border-radius: 14px;
  background: var(--text);
  color: #fff9f2;
  cursor: pointer;
  font-family: var(--display-font);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.split-action-button:hover,
.split-action-button:focus-visible,
.split-card:hover,
.split-card:focus-visible,
.split-card__action:hover,
.split-card__action:focus-visible {
  transform: translateY(-1px);
}

.split-action-button--save {
  border-color: rgba(47, 124, 103, 0.4);
  background: linear-gradient(180deg, var(--save-accent), #256556);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.split-action-button:disabled {
  cursor: not-allowed;
  opacity: 0.48;
  transform: none;
}

.split-list {
  display: grid;
  gap: 5px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.split-list__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  min-width: 0;
  gap: 3px;
  align-items: center;
}

.split-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  min-width: 0;
  align-items: center;
  gap: 4px;
  width: 100%;
  padding: 4px 5px;
  border: 1px solid rgba(49, 41, 28, 0.14);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    box-shadow 160ms ease,
    transform 160ms ease;
}

.split-card.is-selected {
  border-color: var(--source-line);
  background:
    linear-gradient(180deg, var(--source), rgba(255, 255, 255, 0.96) 82%);
  box-shadow: inset 3px 0 0 rgba(24, 97, 76, 0.88);
}

.split-card__index {
  display: inline-flex;
  min-width: 18px;
  min-height: 18px;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
  border-radius: 999px;
  background: rgba(49, 41, 28, 0.06);
  color: var(--text);
  font-size: 0.68rem;
  flex: 0 0 auto;
}

.split-card__metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  min-width: 0;
  flex: 1 1 auto;
  align-items: center;
  justify-items: stretch;
  gap: 3px;
  overflow: hidden;
}

.split-card__metric {
  display: flex;
  align-items: center;
  gap: 2px;
  justify-content: center;
  min-width: 0;
  overflow: hidden;
  white-space: nowrap;
}

.split-card__metric-label {
  display: inline-flex;
  min-width: 13px;
  min-height: 13px;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: rgba(187, 93, 42, 0.12);
  color: var(--accent);
  font-size: 0.4rem;
  flex: 0 0 auto;
}

.split-card__metric-value {
  margin: 0;
  min-width: 0;
  overflow: hidden;
  color: var(--text);
  font-family: var(--number-font);
  font-size: 0.68rem;
  letter-spacing: -0.03em;
  line-height: 1;
  text-align: center;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.split-card__actions {
  display: flex;
  gap: 1px;
  align-items: center;
  flex: 0 0 auto;
}

.split-card__action {
  display: inline-flex;
  inline-size: 1.7rem;
  block-size: 1.7rem;
  min-height: 1.7rem;
  align-items: center;
  justify-content: center;
  padding: 0;
  border: 1px solid rgba(49, 41, 28, 0.12);
  border-radius: 0.72rem;
  background: rgba(255, 255, 255, 0.94);
  color: var(--text);
  cursor: pointer;
  line-height: 0;
  transition:
    border-color 160ms ease,
    background-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.split-card__action:disabled {
  border-color: rgba(49, 41, 28, 0.08);
  background: rgba(244, 238, 231, 0.82);
  color: rgba(49, 41, 28, 0.4);
  cursor: default;
  transform: none;
}

.split-card__action-icon {
  inline-size: 0.78rem;
  block-size: 0.78rem;
  stroke-width: 1.35;
  pointer-events: none;
}

.split-card__action--danger {
  border-color: rgba(157, 63, 34, 0.18);
  background: rgba(255, 245, 240, 0.94);
  color: var(--danger);
}

@media (max-width: 540px) {
  .page-shell {
    padding-inline: 4px;
  }

  .calculator-panel {
    border-radius: 22px;
  }

  .preset-row {
    gap: 2px;
  }

  .preset-row .chip-button {
    min-height: 28px;
    padding: 4px 2px;
    font-size: 0.48rem;
    letter-spacing: 0.04em;
  }

  .chip-button--increment {
    padding-inline: 6px;
    font-size: 0.48rem;
    letter-spacing: 0.06em;
  }

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

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

  .split-card {
    gap: 3px;
    padding: 3px 4px;
  }

  .split-card__index {
    min-width: 17px;
    min-height: 17px;
    font-size: 0.64rem;
  }

  .split-card__metrics {
    gap: 2px;
  }

  .split-card__metric-value {
    font-size: 0.6rem;
  }

  .split-card__action {
    inline-size: 1.48rem;
    block-size: 1.48rem;
    min-height: 1.48rem;
  }

  .split-card__action-icon {
    inline-size: 0.7rem;
    block-size: 0.7rem;
  }
}

@media (max-width: 360px) {
  .split-card__metric-label {
    min-width: 12px;
    min-height: 12px;
  }

  .split-card__metric-value {
    font-size: 0.56rem;
  }

  .split-card__action {
    inline-size: 1.38rem;
    block-size: 1.38rem;
    min-height: 1.38rem;
  }

  .split-card__action-icon {
    inline-size: 0.62rem;
    block-size: 0.62rem;
  }
}