:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #14141f;
  --bg-tertiary: #1e1e2e;
  --text-primary: #ffffff;
  --text-secondary: #a0a0b0;
  --text-muted: #606070;
  --accent: #00d4ff;
  --accent-secondary: #00ff88;
  --danger: #ff4466;
  --focus-ring: #00d4ff;
  --focus-glow: rgba(0, 212, 255, 0.4);
  --radius-md: 12px;
  --radius-sm: 8px;
}

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

html, body {
  width: 600px;
  height: 600px;
  overflow: hidden;
  background: #000;
  color: var(--text-primary);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

#app { width: 100%; height: 100%; position: relative; }

.screen {
  width: 100%; height: 100%;
  position: absolute; top: 0; left: 0;
  display: flex;
  flex-direction: column;
}

.screen.hidden { display: none; }

.focusable {
  transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
  border: 2px solid transparent;
  outline: none;
  cursor: pointer;
}
.focusable:focus {
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}

.hidden { display: none !important; }

/* Header */
.header {
  padding: 20px 24px 14px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--bg-tertiary);
  flex-shrink: 0;
}

.header.sub {
  padding: 14px 24px 12px;
}

.title {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  line-height: 1.1;
  color: var(--text-primary);
}

.title.sm {
  font-size: 22px;
}

.subtitle {
  font-size: 11px;
  color: var(--text-secondary);
  margin-top: 8px;
  text-transform: uppercase;
  letter-spacing: 1.8px;
  font-weight: 600;
}

.back-hint {
  font-size: 10px;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.8px;
  margin-bottom: 6px;
  font-weight: 700;
}

/* Home menu */
.menu {
  flex: 1;
  padding: 12px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

.menu-item {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 70px;
}

.menu-item:focus {
  background: var(--bg-tertiary);
}

.menu-marker {
  width: 5px;
  align-self: stretch;
  background: var(--accent);
  border-radius: 3px;
  opacity: 0.35;
  transition: opacity 0.15s ease;
}

.menu-item:focus .menu-marker {
  opacity: 1;
}

.menu-text { flex: 1; min-width: 0; }

.menu-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.2;
}

.menu-sub {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 3px;
  letter-spacing: 0.4px;
}

/* Content */
.content {
  flex: 1;
  padding: 12px 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}

.section-label {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1.8px;
  padding: 0 4px;
  margin-top: 2px;
}

/* Presets */
.preset-row {
  display: flex;
  gap: 8px;
}

.preset {
  flex: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  padding: 12px 0;
  text-align: center;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.5px;
}

.preset.active {
  background: rgba(0, 212, 255, 0.15);
  color: var(--accent);
}

/* Steppers */
.stepper-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
}

.stepper {
  flex: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 6px 10px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 88px;
}

.stepper.wide {
  padding: 8px 16px 12px;
}

.stepper:focus {
  background: var(--bg-tertiary);
}

.stepper-hint {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 3px;
  opacity: 0.35;
  font-weight: 700;
  transition: opacity 0.15s ease, color 0.15s ease;
  margin-bottom: 2px;
}

.stepper:focus .stepper-hint {
  color: var(--accent);
  opacity: 1;
}

.stepper-value {
  font-size: 30px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  line-height: 1.05;
  letter-spacing: -0.5px;
}

.stepper:focus .stepper-value {
  color: var(--accent);
}

.stepper-unit {
  font-size: 11px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-top: 4px;
  font-weight: 600;
}

.stepper-sep {
  font-size: 30px;
  font-weight: 200;
  color: var(--text-muted);
  line-height: 1;
  padding-bottom: 4px;
  user-select: none;
}

/* Result */
.result-box {
  background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
  border-radius: var(--radius-md);
  padding: 14px 20px 16px;
  text-align: center;
  border: 1px solid rgba(0, 212, 255, 0.18);
  margin-top: auto;
}

.result-label {
  font-size: 10px;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 2.5px;
  margin-bottom: 6px;
  font-weight: 700;
}

.result-value {
  font-size: 38px;
  font-weight: 800;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  letter-spacing: -1px;
  line-height: 1.05;
}

.result-unit {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 1px;
  margin-left: 4px;
}

/* Splits */
.splits-table {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 4px 0;
  margin-top: 4px;
}

.split-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 22px;
  border-bottom: 1px solid var(--bg-tertiary);
  min-height: 44px;
}

.split-row:last-child { border-bottom: none; }

.split-dist {
  font-size: 14px;
  font-weight: 700;
  color: var(--text-secondary);
  letter-spacing: 1.5px;
  text-transform: uppercase;
}

.split-time {
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}