/* CSS for BeatCheck app v 1.0*/

:root {
  --bg: #0b0f17;
  --panel: #111827;
  --panel2: #0f172a;
  --text: #e6edf7;
  --muted: #a6b0c3;
  --border: rgba(255, 255, 255, 0.12);
  --border2: rgba(255, 255, 255, 0.18);
  --shadow: rgba(0, 0, 0, 0.35);
  --blue: #4aa3ff;
  --red: #ff4a4a;
  --neutral: #e6edf7;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  color: var(--text);
  background: radial-gradient(1200px 600px at 25% 0%, rgba(74,163,255,0.10), transparent 55%),
              radial-gradient(900px 500px at 80% 20%, rgba(255,74,74,0.09), transparent 55%),
              var(--bg);
}

button, input {
  font: inherit;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 18px;
  padding-bottom: calc(18px + env(safe-area-inset-bottom));
  max-width: 820px;
  margin: 0 auto;
}

.app__header {
  text-align: center;
  margin-bottom: 14px;
}

.app__title {
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: 20px;
}

.app__subtitle {
  color: var(--muted);
  font-size: 13px;
  margin-top: 2px;
}

.app__main {
  flex: 1;
  display: block;
}

.view { display: none; }
.view--active { display: block; }

.panel {
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  box-shadow: 0 10px 24px var(--shadow);
}

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

.row--space {
  justify-content: space-between;
}

.label {
  font-size: 12px;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  color: var(--muted);
}

.value {
  font-size: 22px;
  font-weight: 700;
  margin-top: 2px;
}

.helper {
  color: var(--muted);
  font-size: 13px;
  margin-top: 8px;
}

.hint {
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.hint--sub {
  opacity: 0.85;
  margin-top: 4px;
}

.slider {
  width: 100%;
  margin-top: 12px;
}

.stepper {
  display: flex;
  gap: 8px;
}

.btn {
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.03);
  color: var(--text);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  transition: transform 80ms ease, background 120ms ease, border-color 120ms ease;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  width: 100%;
  padding: 12px 14px;
  background: linear-gradient(180deg, rgba(74,163,255,0.22), rgba(74,163,255,0.10));
  border-color: rgba(74,163,255,0.35);
  font-weight: 700;
}

.btn--ghost {
  background: rgba(255,255,255,0.02);
}

.btn:focus-visible, .segmented__btn:focus-visible, .iconbtn:focus-visible {
  outline: 2px solid rgba(74,163,255,0.6);
  outline-offset: 2px;
}

.segmented {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 6px;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255,255,255,0.02);
}

.segmented__btn {
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  border-radius: 10px;
  padding: 10px 8px;
  cursor: pointer;
}

.segmented__btn[aria-checked="true"] {
  color: var(--text);
  background: rgba(255,255,255,0.06);
  border-color: var(--border);
}

.switch {
  position: relative;
  display: inline-flex;
  align-items: center;
  width: 52px;
  height: 30px;
}

.switch input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.switch__track {
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.08);
  border: 1px solid var(--border);
  border-radius: 999px;
}

.switch__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: rgba(255,255,255,0.85);
  transition: left 160ms ease;
}

.switch input:checked ~ .switch__thumb {
  left: 25px;
}

/* Test View */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 10px;
}

.topbar__left {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.topbar__line1 {
  font-weight: 800;
  font-size: 16px;
}

.topbar__line2 {
  font-size: 13px;
  color: var(--muted);
}

.topbar__center {
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  font-size: 18px;
}

.iconbtn {
  border: 1px solid var(--border);
  background: rgba(255,255,255,0.02);
  width: 36px;
  height: 36px;
  border-radius: 10px;
  color: var(--text);
  cursor: pointer;
}

.tip {
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 6px;
  transition: opacity 220ms ease, transform 220ms ease;
}

.tip--show {
  opacity: 1;
  transform: translateY(0);
}

.lane {
  background: rgba(255,255,255,0.02);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 10px;
}

.lane__labels {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: 0.4px;
  margin-bottom: 6px;
}

.lane__center {
  opacity: 0.9;
}

.lane__canvas {
  width: 100%;
  height: 150px;
  display: block;
}

.feedback {
  font-weight: 700;
  letter-spacing: 0.2px;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.check input {
  width: 16px;
  height: 16px;
}

.tap {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255,255,255,0.04), rgba(255,255,255,0.02));
  box-shadow: 0 10px 24px rgba(0,0,0,0.25);
  min-height: 38vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.tap:active {
  border-color: var(--border2);
}

.tap__text {
  font-weight: 900;
  letter-spacing: 1.2px;
  font-size: 38px;
}

.tap__sub {
  color: var(--muted);
  font-size: 13px;
  margin-top: 8px;
}

.countin {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 20;
}

.countin--show {
  display: flex;
}

.countin__num {
  font-weight: 900;
  font-variant-numeric: tabular-nums;
  font-size: 96px;
  text-shadow: 0 8px 22px rgba(0,0,0,0.45);
}

/* Overlays */
.backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.55);
  display: none;
  z-index: 30;
}

.backdrop--show {
  display: block;
}

.overlay {
  position: fixed;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: min(560px, calc(100% - 28px));
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 20px 48px rgba(0,0,0,0.55);
  display: none;
  z-index: 40;
}

/* Calibration overlay: fully opaque (no translucency) */
#calibrationOverlay.overlay {
  background: linear-gradient(180deg, #111827, #0f172a);
}

.overlay--small {
  width: min(420px, calc(100% - 28px));
}

.overlay--show {
  display: block;
}


/* Results overlay: push actions to the bottom so "Try again" isn't accidentally hit */
#resultsOverlay.overlay--show {
  display: flex;
  flex-direction: column;
  max-height: min(88vh, 640px);
}

#resultsOverlay .overlay__body {
  overflow: auto;
}

#resultsOverlay .overlay__actions {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: stretch;
}

#resultsOverlay .overlay__actionsRow {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

#resultsOverlay #resultsRetryBtn {
  width: 100%;
}

.overlay__title {
  font-weight: 900;
  font-size: 18px;
}

.overlay__title {
  font-weight: 900;
  font-size: 18px;
}

.overlay__body {
  margin-top: 10px;
  color: var(--text);
  line-height: 1.35;
}

.overlay__muted {
  color: var(--muted);
  font-size: 13px;
}

.overlay__actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.calibStatus {
  font-weight: 800;
}

.calibTap {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: rgba(255,255,255,0.02);
  padding: 16px;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.calibTap__text {
  font-weight: 900;
  letter-spacing: 1px;
  font-size: 26px;
  text-align: center;
}

.calibTap__sub {
  margin-top: 6px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

.resultsGrid {
  display: grid;
  gap: 10px;
}

.resultsRow {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 14px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: rgba(255,255,255,0.02);
}

.resultsLabel {
  color: var(--muted);
  font-size: 13px;
}

.resultsValue {
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.coaching {
  padding: 10px 12px;
  border: 1px solid rgba(74,163,255,0.25);
  border-radius: 12px;
  background: rgba(74,163,255,0.08);
  color: var(--text);
}

@media (max-width: 420px) {
  .tap__text { font-size: 34px; }
  .countin__num { font-size: 84px; }

  #resultsOverlay.overlay {
    top: 72.5%;
  }
}

/* Tweaks v2 */
.topbar__right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.iconbtn--stop {
  width: auto;
  padding: 0 12px;
  font-size: 13px;
  font-weight: 800;
  border-color: rgba(255,74,74,0.35);
  background: rgba(255,74,74,0.08);
}