:root {
  --bg: #f4f4f4;
  --surface: #f4f4f4;
  --surface-elevated: #f4f4f4;
  --border: #d0d0d0;
  --border-subtle: #e0e0e0;
  --text-main: #666666;
  /* matches the grey of the big numbers */
  --text-numbers: #8d8d8d;
  --text-muted: #999999;
  --accent: #e53935;
  --accent-soft: #ececec;
  --nav-bg: #f4f4f4;
  --grid-line: #bdbdbd;
  --grid-line-subtle: #d6d6d6;
  --ftp-line: #5f9ceb;
  --power-line: #a607a6;
  --hr-line: #c90f02;
  --cad-line: #2d8201;
  --time-scrub: #ffff00;
  --shade-bg: #000000;
  --radius: 8px;
  --modal-radius: calc(var(--radius) * 2);
  --nav-control-height: 32px;
  --button-padding-x: 12px;
  --font-size-base: 16px;
  --interactive-transition: background-color 0.18s ease, color 0.18s ease,
    border-color 0.18s ease, box-shadow 0.18s ease, transform 0.14s ease;

  /* interval colors (light mode, as in options.js) */
  --zone-recovery: #c9c9c9;
  --zone-endurance: #489fff;
  --zone-tempo: #5dd987;
  --zone-threshold: #ffd738;
  --zone-vo2: #ff744c;
  --zone-anaerobic: #ff403d;

  --stat-number-color: #333333;

  --select-arrow: url("data:image/svg+xml;utf8,\
    <svg xmlns='http://www.w3.org/2000/svg' width='9' height='5' viewBox='0 0 9 5' fill='none'>\
      <path d='M1 1l3.5 3L8 1' stroke='%23999' stroke-width='1.1' stroke-linecap='round' stroke-linejoin='round'/>\
    </svg>");
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #222222;
    --surface: #222222;
    --surface-elevated: #222222;
    --border: #3a3a3a;
    --border-subtle: #333333;
    --text-main: #aaaaaa;
    --text-numbers: #9b9b9b;
    --text-muted: #777777;
    --accent: #ff5252;
    --accent-soft: #222222;
    --nav-bg: #222222;
    --grid-line: #444444;
    --grid-line-subtle: #333333;
    --ftp-line: #5c7ea6;
    --power-line: #ffb300;
    --hr-line: #e82210;
    --time-scrub: #fdd835;
    --cad-line: #6ad60b;
    --shade-bg: #ffffff;

    /* slightly darkened versions of the light colors */
    --zone-recovery: #dddddd;
    --zone-endurance: #6ac2ff;
    --zone-tempo: #70e870;
    --zone-threshold: #ffe763;
    --zone-vo2: #ff8a58;
    --zone-anaerobic: #ff5959;

    --stat-number-color: #f5f5f5;
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
}

body {
  background: var(--bg);
  color: var(--text-main);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", system-ui, sans-serif;
  font-size: var(--font-size-base);
  display: flex;
  justify-content: center;
  align-items: stretch;
}

button,
input,
select,
textarea {
  font: inherit;
  transition: var(--interactive-transition);
}

a {
  color: var(--text-muted);
  text-decoration: underline;
}

a:hover {
  color: var(--text-main);
  text-decoration: underline;
}

@media (prefers-color-scheme: dark) {
  a {
    color: var(--text-muted);
  }

  a:hover {
    color: var(--text-main);
  }
}


.page-root {
  width: 100%;
  height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 16px 16px 54px;
  gap: 10px;
}

/* prevent selecting HUD & chart text */
.top-panel,
.top-panel *,
.chart-panel,
.chart-panel * {
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

/* 2x3 stat grid */

.top-panel {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 2fr 1fr;
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 0;
  min-height: 0;
}

.stat-card {
  background: transparent;
  border-radius: 0;
  border: none;
  padding: 4px 6px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-width: 0;
}

.stat-label {
  text-align: center;
  font-size: var(--font-size-base);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.stat-value {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}

.stat-value span {
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
  color: var(--stat-number-color);
}

/* Chart */

.chart-panel {
  flex: 1;
  background: transparent;
  border-radius: 0;
  border: none;
  position: relative;
  overflow: hidden;
  padding: 0;
  min-height: 0;
}

#chartSvg {
  width: 100%;
  height: 100%;
  display: block;
}

.chart-tooltip {
  position: absolute;
  pointer-events: none;
  font-size: 16px;
  padding: 4px 6px;
  border-radius: var(--radius);
  background: #ffffff;
  color: #666666;
  border: 1px solid rgba(0, 0, 0, 0.12);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.16);
  white-space: nowrap;
  display: none;
  z-index: 10;
}

@media (prefers-color-scheme: dark) {
  .chart-tooltip {
    background: #303030;
    color: #dddddd;
    border: 1px solid rgba(255, 255, 255, 0.16);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.8);
  }
}

/* Bottom navbar */

.bottom-nav {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 16px;
  background: var(--nav-bg);
  border-top: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  font-size: var(--font-size-base);
  color: var(--text-main);
}

.mode-toggle-wrapper {
  position: absolute;
  left: 50%;
  top: 0;
  transform: translateX(-50%);
  height: 100%;
  display: flex;
  align-items: center;
  pointer-events: none;
}

.mode-toggle-inner {
  display: flex;
  align-items: center;
  pointer-events: auto;
  gap: 6px;
}

.workout-title-center {
  font-size: var(--font-size-base);
  font-weight: 600;
  white-space: nowrap;
  max-width: 60vw;
  overflow: hidden;
  text-overflow: ellipsis;
  text-align: center;
  color: var(--text-main);
}

.nav-left,
.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.nav-right {
  margin-left: auto;
}

.device-group {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 0 var(--button-padding-x);
  padding-left: calc(var(--button-padding-x) - 4px);
  border-radius: var(--radius);
  border: none;
  background: transparent;
  cursor: pointer;
  height: var(--nav-control-height);
  font-size: var(--font-size-base);
  color: var(--text-main);
  transition: var(--interactive-transition);
}

.device-label {
  font-size: var(--font-size-base);
  color: var(--text-main);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 4px;
}

.device-battery {
  font-size: var(--font-size-base);
  color: var(--text-muted);
}

.icon-box {
  width: 22px;
  height: 22px;
  border-radius: var(--radius);
  border: none;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  flex-shrink: 0;
  color: var(--text-main);
}

.icon-box svg {
  width: 18px;
  height: 18px;
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

.status-dot {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: #a0a0a0;
}

.status-dot.connected {
  background: #18a058;
}

.status-dot.connecting {
  background: #f9a825;
}

.status-dot.error {
  background: #e53935;
}

.battery-low {
  color: #f57c00;
}

.nav-icon-button {
  width: var(--nav-control-height);
  height: var(--nav-control-height);
  border-radius: var(--radius);
  border: none;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  color: var(--text-main);
  transition: var(--interactive-transition);
}

.nav-icon-button svg {
  width: 18px;
  height: 18px;
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

.nav-icon-button:hover,
.device-group:hover {
  background: rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {

  .nav-icon-button:hover,
  .device-group:hover {
    background: rgba(255, 255, 255, 0.10);
  }
}

.nav-icon-button.active {
  background: rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  .nav-icon-button.active {
    background: rgba(255, 255, 255, 0.10);
  }
}

/* Mode toggle */

.mode-toggle {
  display: inline-flex;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--surface);
  height: var(--nav-control-height);
  color: var(--text-main);
}

.mode-toggle-button {
  border: none;
  background: transparent;
  padding: 0 var(--button-padding-x);
  font-size: var(--font-size-base);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  white-space: nowrap;
  color: inherit;
  transition: var(--interactive-transition);
}

.mode-toggle-button+.mode-toggle-button {
  border-left: 1px solid var(--border-subtle);
}

.mode-toggle-button.active {
  background: rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  .mode-toggle-button.active {
    background: rgba(255, 255, 255, 0.10);
  }
}

/* Manual controls */

.control-group {
  display: inline-flex;
  align-items: stretch;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  overflow: hidden;
  background: var(--surface);
  height: var(--nav-control-height);
  color: var(--text-main);
}

.control-btn {
  min-width: 26px;
  border: none;
  border-right: 1px solid var(--border-subtle);
  background: transparent;
  font-size: 16px;
  cursor: pointer;
  padding: 0 var(--button-padding-x);
  display: flex;
  align-items: center;
  justify-content: center;
  color: inherit;
}

.control-btn:last-child {
  border-right: none;
  border-left: 1px solid var(--border-subtle);
}

.control-btn:hover {
  background: rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  .control-btn:hover {
    background: rgba(255, 255, 255, 0.10);
  }
}

.control-value {
  min-width: 54px;
  padding: 0 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-variant-numeric: tabular-nums;
  font-size: var(--font-size-base);
  color: inherit;
}

.workout-controls {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main);
  flex: 1;
}

.playback-button {
  width: var(--nav-control-height);
  height: var(--nav-control-height);
  border-radius: var(--radius);
  border: 0px solid var(--border);
  background: var(--surface);
  display: none;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
  color: var(--text-main);
}


.playback-button.visible {
  display: flex;
  /* shown when JS adds .visible */
}

.playback-button svg {
  width: 18px;
  height: 18px;
  display: block;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
}

.playback-button:hover {
  background: rgba(0, 0, 0, 0.06);
}

@media (prefers-color-scheme: dark) {
  .playback-button:hover {
    background: rgba(255, 255, 255, 0.10);
  }
}

.inline-clicktoggle {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-base);
  border-radius: var(--radius);
  padding: 0 var(--button-padding-x);
  background: var(--surface);
  height: var(--nav-control-height);
  color: var(--text-main);
  background: rgba(0, 0, 0, 0.0);
  cursor: pointer;
  transition: var(--interactive-transition);
}

.inline-clicktoggle span {
  white-space: nowrap;
}

.inline-clicktoggle:hover {
  background: rgba(0, 0, 0, 0.06);
}

.inline-clicktoggle:active {
  background: rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  .inline-clicktoggle:hover {
    background: rgba(255, 255, 255, 0.10);
  }

  .inline-clicktoggle:active {
    background: rgba(255, 255, 255, 0.14);
  }
}

/* Debug overlay (no longer used, retained for reference)
   (Could be removed once we're sure settings logs cover all needs)
*/

.debug-overlay {
  position: fixed;
  inset: 10px;
  border-radius: var(--radius);
  padding: 8px;
  display: none;
  flex-direction: column;
  font-size: var(--font-size-base);
  z-index: 50;
  background: rgba(255, 255, 255, 0.85);
  color: #111111;
}

.debug-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
  font-size: var(--font-size-base);
}

.debug-header-title {
  font-weight: 600;
  font-size: var(--font-size-base);
}

.debug-close-btn {
  border-radius: var(--radius);
  border: 1px solid #999;
  background: transparent;
  color: inherit;
  padding: 2px 6px;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: var(--interactive-transition);
}

.debug-log {
  flex: 1;
  overflow: auto;
  background: rgba(0, 0, 0, 0.05);
  border-radius: var(--radius);
  padding: 4px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  white-space: pre-wrap;
  font-size: var(--font-size-base);
}

@media (prefers-color-scheme: dark) {
  .debug-overlay {
    background: rgba(0, 0, 0, 0.85);
    color: #aaaaaa;
  }

  .debug-log {
    background: rgba(0, 0, 0, 0.55);
  }

  .debug-close-btn {
    border-color: #777;
  }
}

/* Status overlay (countdown / paused / resumed) */

.status-overlay {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 40;
  opacity: 0;
  transition: opacity 0.20s ease-out;
  opacity: 0;
  transition: opacity .3s ease;
  color: var(--text-numbers);
  text-shadow: 0 0 20px rgba(244, 244, 244, 1);
  background: rgba(244, 244, 244, .9);
}

@media (prefers-color-scheme: dark) {
  .status-overlay {
    text-shadow: 0 0 20px rgba(34, 34, 34, 1);
    background: rgba(34, 34, 34, .8);
  }
}

#statusText {
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  text-align: center;
}

@media (max-width: 800px) {
  .bottom-nav {
    font-size: var(--font-size-base);
  }
}


/* Shared FTP-style input (also used in bottom nav manual controls) */

.settings-ftp-input {
  width: 4ch;
  border: none;
  background: transparent;
  color: var(--text-main);
  font: inherit;
  text-align: center;
  outline: none;
}

/* Hide number spinners */
.settings-ftp-input::-webkit-outer-spin-button,
.settings-ftp-input::-webkit-inner-spin-button {
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
}

.settings-ftp-input[type="number"] {
  appearance: textfield;
  -moz-appearance: textfield;
}

.settings-ftp-unit {
  margin-left: 2px;
  font-size: var(--font-size-base);
  color: var(--text-muted);
}

/* Chart empty state */

.chart-empty-state {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 24px;
  pointer-events: none;
  container-type: inline-size;
  z-index: 1;
  /* sit on top of chartSvg */
  background: rgba(244, 244, 244, 0.8);
  /* ~0.75 opacity of light --bg */
}

.chart-empty-message {
  font-size: clamp(1.6rem, 8cqh, 8cqw);
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-numbers);
  max-width: 60%;
  text-shadow: 0 0 32px rgba(244, 244, 244, 1);
}

@media (prefers-color-scheme: dark) {
  .chart-empty-state {
    background: rgba(34, 34, 34, 0.8);
    /* ~0.75 opacity of dark --bg */
  }

  .chart-empty-message {
    text-shadow: 0 0 32px rgba(34, 34, 34, 1);
  }
}

.chart-empty-arrow {
  position: absolute;
  bottom: 0;
  width: auto;
  height: 50%;
}

/* Bike bottom-left */
.chart-empty-arrow--left {
  left: 3%;
  transform: none;
}

/* Workout bottom-right (mirrored) */
.chart-empty-arrow--right {
  right: 3%;
  left: auto;
  transform: scaleX(-1);
}

.chart-empty-arrow-main {
  fill: none;
  stroke: var(--text-numbers);
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

#startBtn {
  margin-left: auto;
}

#workoutNameLabel {
  white-space: nowrap;
}