:root {
  --bg-primary: #1C1E21;
  --bg-panel: #25282C;
  --bg-panel-2: #30343A;
  --text-primary: #FFFFFF;
  --text-secondary: #E4E6EB;
  --text-muted: #B0B3B8;
  --accent: #00D4FF;
  --accent-strong: #68E6FF;
  --success: #69F0AE;
  --warning: #FFC857;
  --danger: #FF5E7A;
  --focus-glow: rgba(0, 212, 255, 0.48);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  width: 600px;
  height: 600px;
  overflow: hidden;
}

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button {
  font: inherit;
}

#app {
  position: relative;
  width: 600px;
  height: 600px;
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg-primary);
}

.screen.hidden {
  display: none;
}

#zone-screen {
  background: var(--bg-primary);
}

#reps-screen {
  background: var(--bg-primary);
}

#done-screen {
  background: var(--bg-primary);
}

.header {
  height: 88px;
  flex: 0 0 88px;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 24px 16px 0;
}

.header h1 {
  color: var(--text-primary);
  font-size: 28px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0;
}

.kicker,
.header-meta {
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.header-meta {
  margin-left: auto;
}

.back-btn,
.stop-btn,
.nav-item,
.zone-card {
  border: 2px solid transparent;
  cursor: pointer;
}

.focusable {
  opacity: 0.82;
  transform: scale(1);
  transition: opacity 140ms ease, transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease, background 140ms ease;
}

.focusable:focus {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--focus-glow);
  outline: none;
  opacity: 1;
  transform: scale(0.972);
}

.focusable:active {
  transform: scale(0.95);
}

.content {
  flex: 1;
  min-height: 0;
  padding: 12px 16px 14px;
  overflow-y: auto;
}

.zone-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.zone-card {
  min-height: 88px;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  color: var(--text-primary);
  background: rgba(28, 30, 33, 0.76);
  border-radius: 8px;
  text-align: center;
}

.zone-card:focus {
  background: var(--bg-panel-2);
}

.zone-card strong {
  font-size: 22px;
  font-weight: 900;
  line-height: 1.05;
}

.zone-card[data-zone="absolute-strength"] strong {
  color: #F5423A;
}

.zone-card[data-zone="accelerative-strength"] strong {
  color: #FF8A00;
}

.zone-card[data-zone="strength-speed"] strong {
  color: #F4B53A;
}

.zone-card[data-zone="speed-strength"] strong {
  color: #6BC95C;
}

.zone-card[data-zone="starting-strength"] strong {
  color: #5ADE45;
}

.nav-bar {
  height: 112px;
  flex: 0 0 112px;
  display: flex;
  gap: 10px;
  padding: 12px 16px;
  background: #202327;
}

.nav-item {
  min-height: 88px;
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 12px;
  border-radius: 8px;
  color: var(--text-primary);
  background: var(--bg-panel);
  font-size: 16px;
  font-weight: 800;
  text-align: center;
}

.nav-item.primary {
  color: #061116;
  background: var(--accent-strong);
}

.back-btn,
.stop-btn {
  min-width: 56px;
  min-height: 56px;
  border-radius: 8px;
  color: var(--text-primary);
  background: var(--bg-panel);
  font-size: 24px;
  font-weight: 900;
}

.reps-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  overflow: hidden;
}

.rep-picker {
  width: 360px;
  height: 286px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px solid transparent;
  border-radius: 8px;
  background: #000000;
}

.rep-picker:focus {
  border-color: var(--accent);
  box-shadow: 0 0 20px var(--focus-glow);
}

.rep-hint,
.rep-label {
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 800;
  text-transform: uppercase;
}

.rep-picker strong {
  margin: 4px 0;
  color: var(--text-primary);
  font-size: 178px;
  font-weight: 900;
  line-height: 0.95;
  font-variant-numeric: tabular-nums;
}

.rep-rail {
  width: 380px;
  display: grid;
  grid-template-columns: 28px 1fr 28px;
  align-items: center;
  gap: 12px;
  color: var(--text-secondary);
  font-size: 24px;
  font-weight: 900;
}

.rep-track {
  height: 8px;
  overflow: hidden;
  border-radius: 999px;
  background: #3A3F46;
}

.rep-fill {
  width: 18%;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 160ms ease;
}

.reps-nav {
  justify-content: center;
  background: var(--bg-primary);
}

.reps-nav .nav-item {
  flex: 0 0 228px;
}

.reps-nav .nav-item.primary {
  color: var(--text-primary);
}

.done-nav {
  background: var(--bg-primary);
}

.done-nav .nav-item.primary {
  color: var(--text-primary);
}

.done-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 24px;
  overflow: hidden;
}

#done-zone {
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 800;
}

#done-summary {
  color: var(--text-primary);
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
}

.pacer-screen {
  background: var(--bg-primary);
}

.pacer-stage {
  width: 600px;
  height: 600px;
  display: grid;
  grid-template-rows: 86px 1fr 96px;
  padding: 24px 16px 16px;
}

.pacer-topline {
  align-self: start;
  color: var(--text-secondary);
  font-size: 18px;
  font-weight: 900;
  text-align: center;
}

.count-number {
  align-self: center;
  justify-self: center;
  color: var(--text-primary);
  font-size: 286px;
  font-weight: 950;
  line-height: 0.84;
  text-align: center;
  text-shadow: 0 0 24px rgba(255, 255, 255, 0.2);
  font-variant-numeric: tabular-nums;
}

.count-number.is-word {
  font-size: 86px;
  line-height: 1;
}

.count-number.pulse {
  animation: count-pulse 260ms ease;
}

@keyframes count-pulse {
  0% { transform: scale(0.92); opacity: 0.5; }
  100% { transform: scale(1); opacity: 1; }
}

.pacer-footer {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 800;
}

.stop-btn {
  width: 148px;
  min-height: 88px;
  font-size: 16px;
}

.pacer-topline[data-zone="absolute-strength"] {
  color: #F5423A;
}

.pacer-topline[data-zone="accelerative-strength"] {
  color: #FF8A00;
}

.pacer-topline[data-zone="strength-speed"] {
  color: #F4B53A;
}

.pacer-topline[data-zone="speed-strength"] {
  color: #6BC95C;
}

.pacer-topline[data-zone="starting-strength"] {
  color: #5ADE45;
}

.done-mark {
  width: 132px;
  height: 132px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 4px solid var(--success);
  border-radius: 50%;
  color: var(--success);
  font-size: 72px;
  font-weight: 900;
}

#done-zone[data-zone="absolute-strength"] {
  color: #F5423A;
}

#done-zone[data-zone="accelerative-strength"] {
  color: #FF8A00;
}

#done-zone[data-zone="strength-speed"] {
  color: #F4B53A;
}

#done-zone[data-zone="speed-strength"] {
  color: #6BC95C;
}

#done-zone[data-zone="starting-strength"] {
  color: #5ADE45;
}