: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;
}
* { 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;
}
#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: all 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); }
.hidden { display: none !important; }

/* ===== HOME ===== */
.app-header {
  padding: 44px 40px 24px;
  text-align: center;
}
.app-header h1 {
  font-size: 52px;
  font-weight: 700;
  letter-spacing: 1px;
  background: linear-gradient(90deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.subtitle {
  margin-top: 8px;
  font-size: 22px;
  color: var(--text-secondary);
}
.duration-grid {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr 1fr;
  gap: 20px;
  padding: 0 40px;
  align-content: center;
}
.duration-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  min-height: 140px;
  background: var(--bg-secondary);
  border-radius: 20px;
  color: var(--text-primary);
}
.duration-btn:focus {
  background: var(--bg-tertiary);
  transform: scale(1.04);
}
.dur-num {
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
}
.dur-unit {
  font-size: 22px;
  color: var(--text-secondary);
  letter-spacing: 2px;
}
.stats-bar {
  padding: 22px 40px 34px;
  text-align: center;
  font-size: 20px;
  color: var(--text-muted);
}

/* ===== TIMER ===== */
.timer-label {
  padding: 36px 0 0;
  text-align: center;
  font-size: 22px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-secondary);
}
.ring-area {
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.progress-ring {
  transform: rotate(-90deg);
}
.ring-track {
  fill: none;
  stroke: var(--bg-tertiary);
  stroke-width: 14;
}
.ring-progress {
  fill: none;
  stroke: var(--accent);
  stroke-width: 14;
  stroke-linecap: round;
  filter: drop-shadow(0 0 8px var(--focus-glow));
  transition: stroke-dashoffset 0.4s linear;
}
.breath-circle {
  position: absolute;
  width: 220px; height: 220px;
  border-radius: 50%;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%) scale(0.65);
  background: radial-gradient(circle,
    rgba(0, 212, 255, 0.28),
    rgba(0, 255, 136, 0.08) 55%,
    transparent 72%);
  animation: breathe 8s ease-in-out infinite;
}
.breath-circle.paused { animation-play-state: paused; }
@keyframes breathe {
  0%   { transform: translate(-50%, -50%) scale(0.65); }
  50%  { transform: translate(-50%, -50%) scale(1.05); }
  100% { transform: translate(-50%, -50%) scale(0.65); }
}
.time-display {
  position: absolute;
  text-align: center;
}
.time-text {
  font-size: 84px;
  font-weight: 300;
  font-variant-numeric: tabular-nums;
  letter-spacing: 2px;
}
.breath-cue {
  margin-top: 6px;
  font-size: 22px;
  letter-spacing: 3px;
  color: var(--accent-secondary);
}
.controls {
  display: flex;
  gap: 20px;
  padding: 0 40px 44px;
}
.ctrl-btn {
  flex: 1;
  min-height: 88px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 26px;
  font-weight: 600;
}
.ctrl-btn:focus {
  background: var(--bg-tertiary);
}
.ctrl-end:focus {
  border-color: var(--danger);
  box-shadow: 0 0 20px rgba(255, 68, 102, 0.4);
}
.ctrl-end { color: var(--danger); }

/* ===== COMPLETE ===== */
.complete-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
}
.complete-icon {
  width: 130px; height: 130px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 70px;
  color: var(--accent-secondary);
  background: rgba(0, 255, 136, 0.1);
  border: 3px solid var(--accent-secondary);
  box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
}
.complete-wrap h2 {
  margin-top: 32px;
  font-size: 46px;
  font-weight: 700;
}
.complete-sub {
  margin-top: 12px;
  font-size: 24px;
  color: var(--text-secondary);
}
.complete-actions {
  margin-top: 48px;
  display: flex;
  gap: 20px;
  width: 100%;
}
.ctrl-again:focus { border-color: var(--accent-secondary); box-shadow: 0 0 20px rgba(0, 255, 136, 0.4); }