:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --border: #e0e0e0;
  --text: #1a1a1a;
  --text-muted: #555;
  --accent: #FF6B35;
  --danger: #C0392B;
  --focus: #0066cc;
  /* Live-mode highlight tokens. Both palettes pass WCAG AA against --text:
     light: #1a1a1a on #FFE08A ≈ 14:1, on #FFF1B8 ≈ 17:1.
     dark:  #f0f0f0 on #6b5a14 ≈ 7.9:1, on #3b3208 ≈ 12:1. */
  --highlight-col-bg: #FFE08A;
  --highlight-row-bg: #FFF1B8;
}

* {
  box-sizing: border-box;
}

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

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
}

.app-header h1 {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  flex: 0 0 auto;
}

/* ---------- Mode toggle ---------- */

.mode-toggle {
  display: inline-flex;
  align-items: stretch;
  gap: 2px;
  padding: 3px;
  background: rgba(0, 0, 0, 0.18);
  border-radius: 999px;
}

.mode-toggle__btn {
  appearance: none;
  background: transparent;
  border: 0;
  color: inherit;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 0 16px;
  min-height: 44px;
  min-width: 44px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}

.mode-toggle__btn[aria-pressed="true"] {
  background: #fff;
  color: var(--accent);
}

.mode-toggle__btn:focus-visible {
  outline: 2px solid #fff;
  outline-offset: -2px;
}

/* Hide chipStart row in planning mode. JS toggles data-mode on #app. */
[data-mode="planning"] .field--live {
  display: none;
}

/* Live-mode-only sections (Q8/Q9). JS toggles data-mode on #app. */
[data-mode="planning"] .live-only {
  display: none;
}

/* ---------- Live banner ---------- */

.live-banner {
  margin: 0 0 12px;
  padding: 12px 14px;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  font-variant-numeric: tabular-nums;
}

.live-banner[hidden] {
  display: none;
}

/* ---------- Settings panel ---------- */

.settings {
  padding: 4px 14px 14px;
  border-top: 1px solid var(--border);
}

.field--row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 44px;
  padding: 4px 0;
}

.field--row[hidden] { display: none; }

.settings__label {
  flex: 1 1 auto;
  font-size: 14px;
  color: var(--text);
  font-weight: 500;
}

.settings__toggle {
  appearance: none;
  -webkit-appearance: none;
  flex: 0 0 auto;
  width: 52px;
  height: 32px;
  margin: 6px 0;
  background: var(--border);
  border-radius: 999px;
  position: relative;
  cursor: pointer;
  transition: background 0.15s ease;
}

.settings__toggle::before {
  content: '';
  position: absolute;
  top: 3px;
  left: 3px;
  width: 26px;
  height: 26px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
  transition: transform 0.15s ease;
}

.settings__toggle:checked {
  background: var(--accent);
}

.settings__toggle:checked::before {
  transform: translateX(20px);
}

.settings__toggle:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.settings__select {
  flex: 0 0 auto;
  font: inherit;
  padding: 6px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface, var(--background, #fff));
  color: var(--text);
  min-height: 36px;
}

.settings__select:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.qe-preset[hidden] { display: none; }

.settings__note {
  margin: 0;
  padding: 0 14px 14px;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

/* ---------- Chip re-seed button (Q6) ---------- */

.reseed-btn {
  appearance: none;
  margin-top: 8px;
  padding: 0 16px;
  min-height: 44px;
  min-width: 44px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.reseed-btn:hover:not(:disabled):not([data-state="armed"]) {
  background: rgba(255, 107, 53, 0.08);
}

.reseed-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.reseed-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  border-color: var(--border);
  color: var(--text-muted);
  background: transparent;
}

.reseed-btn[data-state="armed"] {
  background: #C0392B;
  color: #fff;
  border-color: #C0392B;
  animation: reseed-pulse 1.2s ease-in-out infinite;
}

@keyframes reseed-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(192, 57, 43, 0.6); }
  50% { box-shadow: 0 0 0 6px rgba(192, 57, 43, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .reseed-btn[data-state="armed"] { animation: none; }
}

/* ---------- Clear logged splits (stage 6, two-tap) ---------- */

.clear-splits-btn {
  appearance: none;
  flex: 0 0 auto;
  padding: 0 14px;
  min-height: 44px;
  min-width: 44px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.clear-splits-btn:hover:not([data-state="armed"]) {
  background: rgba(255, 107, 53, 0.08);
}

.clear-splits-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.clear-splits-btn[data-state="armed"] {
  background: #C0392B;
  color: #fff;
  border-color: #C0392B;
  animation: reseed-pulse 1.2s ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .clear-splits-btn[data-state="armed"] { animation: none; }
}

.copy-url-btn {
  appearance: none;
  flex: 0 0 auto;
  padding: 0 14px;
  min-height: 44px;
  min-width: 44px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  background: transparent;
  color: var(--accent);
  border: 2px solid var(--accent);
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s ease;
}

.copy-url-btn:hover { background: rgba(0, 0, 0, 0.04); }

.copy-url-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

#app {
  padding: 12px;
  max-width: 720px;
  margin: 0 auto;
}

/* ---------- Collapsible panel ---------- */

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}

.panel__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 44px;
  padding: 10px 14px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
  user-select: none;
}

.panel__summary::-webkit-details-marker {
  display: none;
}

.panel__summary:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

.panel__chevron {
  width: 10px;
  height: 10px;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.15s ease;
  margin-right: 4px;
}

.panel[open] .panel__chevron {
  transform: rotate(-135deg);
  margin-bottom: -4px;
}

/* ---------- Inputs form ---------- */

.inputs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  padding: 4px 14px 14px;
  border-top: 1px solid var(--border);
}

@media (min-width: 520px) {
  .inputs {
    grid-template-columns: 1fr 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.field__label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.field__input {
  min-height: 44px;
  padding: 8px 12px;
  font-size: 16px; /* 16px prevents iOS zoom-on-focus */
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  width: 100%;
}

.field__input:focus {
  outline: 2px solid var(--focus);
  outline-offset: 0;
  border-color: transparent;
}

.field__input[aria-invalid="true"] {
  border-color: var(--danger);
}

.field__input[aria-invalid="true"]:focus {
  outline-color: var(--danger);
}

.field__error {
  margin: 0;
  font-size: 13px;
  color: var(--danger);
  min-height: 1em;
}

.summary {
  margin: 0;
  padding: 10px 14px 14px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  line-height: 1.4;
  color: var(--text-muted);
}

.summary--warn {
  color: var(--danger);
}

/* ---------- Quick-Entry form (Q9) ---------- */

.quick-entry {
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 4px 14px 14px;
  border-top: 1px solid var(--border);
}

.qe-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.qe-section__label {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 500;
}

.qe-presets {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.qe-preset {
  appearance: none;
  flex: 0 0 auto;
  min-height: 44px;
  min-width: 44px;
  padding: 0 14px;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease, border-color 0.12s ease;
}

.qe-preset:hover:not([aria-pressed="true"]) {
  border-color: var(--accent);
}

.qe-preset:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.qe-preset[aria-pressed="true"] {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.qe-custom__row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 10px;
}

.qe-time-mode {
  display: inline-flex;
  align-self: flex-start;
  padding: 3px;
  background: var(--border);
  border-radius: 999px;
}

.qe-time-mode__btn {
  appearance: none;
  background: transparent;
  border: 0;
  color: var(--text);
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 0 16px;
  min-height: 38px;
  min-width: 44px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}

.qe-time-mode__btn[aria-pressed="true"] {
  background: var(--surface);
  color: var(--accent);
}

.qe-time-mode__btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.qe-time-mode__btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.field__hint {
  margin: 0;
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
}

.qe-error {
  margin: 0;
  padding: 10px 12px;
  font-size: 13px;
  line-height: 1.4;
  color: var(--danger);
  background: rgba(192, 57, 43, 0.08);
  border: 1px solid var(--danger);
  border-radius: 8px;
}

.qe-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.qe-log-btn {
  appearance: none;
  flex: 0 0 auto;
  min-height: 44px;
  padding: 0 22px;
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.12s ease, opacity 0.12s ease;
}

.qe-log-btn:hover:not(:disabled) {
  background: #e85d2c;
}

.qe-log-btn:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.qe-log-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.qe-status {
  font-size: 14px;
  font-weight: 600;
  color: #2a8a2a;
  opacity: 0;
  transition: opacity 0.12s ease;
}

.qe-status[data-visible="true"] {
  opacity: 1;
}

@media (prefers-color-scheme: dark) {
  .qe-status {
    color: #6fdc6f;
  }
  .qe-error {
    background: rgba(255, 107, 90, 0.12);
  }
}

/* ---------- Recent splits list ---------- */

.recent-splits {
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}

.recent-splits__title {
  margin: 0 0 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.recent-splits__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}

.recent-splits__item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 12px;
  align-items: baseline;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
}

.recent-splits__list .recent-splits__item:last-child {
  border-bottom: 0;
}

.recent-splits__distance {
  font-weight: 600;
  color: var(--text);
}

.recent-splits__time {
  color: var(--text);
}

.recent-splits__pace {
  color: var(--text-muted);
  font-size: 13px;
}

/* ---------- Cell-tap armed state (Q8) ---------- */

.splits__cell--armed {
  background: var(--highlight-col-bg);
  color: var(--text);
  white-space: nowrap;
}

.splits__cell-armed-time {
  font: inherit;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  width: 11ch;
  margin: 0 4px;
  padding: 4px 6px;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
}

.splits__cell-armed-time:focus {
  outline: 2px solid var(--focus);
  outline-offset: 0;
  border-color: transparent;
}

.splits__cell-armed-hint {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-left: 4px;
}

/* ---------- Splits table ---------- */

.splits-container {
  margin-top: 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.splits {
  width: max-content;
  min-width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  color: var(--text);
}

.splits thead th,
.splits tbody th,
.splits tbody td {
  padding: 10px 12px;
  white-space: nowrap;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.splits thead th {
  font-weight: 600;
  color: var(--text-muted);
  border-bottom-width: 2px;
  text-align: right;
}

.splits__pace-head {
  /* Padding bumps cell to ≥44px tall so the Live-mode tappable target
     meets Apple HIG, even with 13px font and ~16px line-height. */
  padding-top: 14px;
  padding-bottom: 14px;
  min-width: 44px;
}

[data-mode="live"] .splits__pace-head {
  cursor: pointer;
  user-select: none;
}

[data-mode="live"] .splits__pace-head:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: -2px;
}

[data-mode="live"] .splits__pace-head:hover:not([aria-pressed="true"]) {
  color: var(--text);
}

/* ---------- Live-mode column highlight ---------- */

.splits tbody td.splits__col--selected,
.splits thead th.splits__col--selected {
  background: var(--highlight-col-bg);
  color: var(--text);
  font-weight: 600;
}

/* ---------- Live-mode row highlight (current projected mile) ---------- */

.splits tbody tr.splits__row--current > .splits__cell,
.splits tbody tr.splits__row--current > .splits__mile {
  background: var(--highlight-row-bg);
  color: var(--text);
}

/* Intersection: keep the saturated column color so the "you are here"
   crosshair reads as a single cell, not a faded row segment. */
.splits tbody tr.splits__row--current > .splits__cell.splits__col--selected {
  background: var(--highlight-col-bg);
}

.splits tbody td {
  text-align: right;
  color: var(--text);
}

.splits__mile-head,
.splits__mile {
  position: sticky;
  left: 0;
  z-index: 2;
  background: var(--surface);
  color: var(--text);
  text-align: left;
  font-weight: 600;
  border-right-width: 2px;
}

.splits tr > *:last-child {
  border-right: 0;
}

.splits tbody tr:last-child > * {
  border-bottom: 0;
}

.splits__placeholder {
  margin: 0;
  padding: 16px;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.4;
}

/* ---------- Dark palette ---------- */

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121212;
    --surface: #1e1e1e;
    --border: #333;
    --text: #f0f0f0;
    --text-muted: #bbb;
    --danger: #ff6b5a;
    --focus: #66b2ff;
    --highlight-col-bg: #6b5a14;
    --highlight-row-bg: #3b3208;
  }
}