: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', sans-serif;
  -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;
  padding: 16px;
  gap: 12px;
}

.screen.hidden { display: none; }

.focusable {
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
  border: 2px solid transparent;
  cursor: pointer;
  outline: none;
}

.focusable:focus {
  border-color: var(--focus-ring);
  box-shadow: 0 0 20px var(--focus-glow);
}

.focusable:disabled {
  cursor: not-allowed;
  opacity: 0.32;
}

.hidden { display: none !important; }

/* ---- Time display ---- */
.time-display {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  height: 148px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.time-main {
  font-size: 78px;
  font-weight: 200;
  letter-spacing: -2px;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
  transition: color 0.2s ease;
}

.time-main.running { color: var(--accent); }

/* ---- Lap info row ---- */
.lap-info {
  display: flex;
  gap: 12px;
  height: 72px;
  flex-shrink: 0;
}

.lap-stat {
  flex: 1;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 10px 18px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 3px;
}

.lap-label {
  font-size: 10px;
  color: var(--text-muted);
  letter-spacing: 2px;
  font-weight: 700;
  text-transform: uppercase;
}

.lap-value {
  font-size: 24px;
  font-weight: 400;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}

/* ---- Scroll/list areas ---- */
.list-area {
  flex: 1;
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 8px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-height: 0;
}

.lap-item {
  display: grid;
  grid-template-columns: 72px 1fr 104px;
  align-items: center;
  padding: 7px 12px;
  font-variant-numeric: tabular-nums;
  border-radius: var(--radius-sm);
  background: var(--bg-secondary);
  flex-shrink: 0;
}

.lap-item .lap-num {
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
}

.lap-item .lap-split {
  color: var(--text-primary);
  font-size: 20px;
  text-align: center;
  font-weight: 300;
}

.lap-item .lap-cum {
  color: var(--text-muted);
  font-size: 13px;
  text-align: right;
}

.lap-item.fastest { background: rgba(0, 255, 136, 0.10); }
.lap-item.fastest .lap-split { color: var(--accent-secondary); }
.lap-item.fastest .lap-num::after { content: ' \2191'; color: var(--accent-secondary); }

.lap-item.slowest { background: rgba(255, 68, 102, 0.10); }
.lap-item.slowest .lap-split { color: var(--danger); }
.lap-item.slowest .lap-num::after { content: ' \2193'; color: var(--danger); }

.empty {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  color: var(--text-muted);
  font-size: 14px;
  letter-spacing: 1px;
  text-align: center;
  padding: 0 24px;
}

/* ---- Controls ---- */
.controls {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.btn {
  flex: 1;
  height: 64px;
  font-family: inherit;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 1.5px;
  cursor: pointer;
}

.btn-primary { background: var(--accent); color: #001218; }
.btn-primary.stopping { background: var(--danger); color: var(--text-primary); }
.btn-accent { background: var(--accent-secondary); color: #001a0e; }
.btn-tertiary { background: var(--bg-tertiary); color: var(--text-primary); }
.btn-danger { background: var(--danger); color: var(--text-primary); }

.btn-tertiary.focusable:focus { background: #2a2a3e; }

/* ---- Header (history / session) ---- */
.header {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  padding: 14px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 76px;
  flex-shrink: 0;
}

.header-info { display: flex; flex-direction: column; gap: 3px; }
.header-total { display: flex; flex-direction: column; gap: 3px; align-items: flex-end; }

.header h1 { font-size: 23px; font-weight: 500; color: var(--text-primary); }

.header-label {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--text-muted);
  font-weight: 700;
  text-transform: uppercase;
}

.session-total {
  font-size: 26px;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-weight: 400;
}

/* ---- History items ---- */
.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 18px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  font-variant-numeric: tabular-nums;
  font-family: inherit;
  text-align: left;
  color: var(--text-primary);
  flex-shrink: 0;
}

.history-item:focus { background: #2a2a3e; }

.history-meta { display: flex; flex-direction: column; gap: 4px; }
.history-date { color: var(--text-primary); font-size: 15px; font-weight: 500; }
.history-laps-count { color: var(--text-muted); font-size: 12px; letter-spacing: 0.5px; }
.history-time { color: var(--accent); font-size: 23px; font-weight: 300; }

/* ---- Compact lap rows for session detail ---- */
.session-laps .lap-item { padding: 6px 12px; }
.session-laps .lap-item .lap-split { font-size: 18px; }