: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;
  --prep: #ffaa33;
  --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; }

/* ---------- Header / Footer ---------- */
.hdr { padding: 28px 32px 12px; }
.hdr-title { font-size: 40px; font-weight: 800; letter-spacing: -0.5px; }
.hdr-sub { font-size: 18px; color: var(--text-secondary); margin-top: 4px; }
.foot { margin-top: auto; padding: 18px 32px; font-size: 16px; color: var(--text-muted); border-top: 1px solid var(--bg-tertiary); background: var(--bg-primary); }

/* ---------- Buttons ---------- */
.btn {
  display: flex; align-items: center; justify-content: center;
  width: 100%; min-height: 88px; padding: 0 24px;
  background: var(--bg-secondary); color: var(--text-primary);
  border-radius: var(--radius-md); font-size: 26px; font-weight: 700;
  border: 2px solid transparent;
}
.btn-primary { background: var(--accent); color: #001018; }
.btn-danger { background: var(--bg-secondary); color: var(--danger); }
.btn-toggle { background: var(--bg-tertiary); color: var(--text-secondary); min-height: 64px; font-size: 22px; }

/* ---------- Home ---------- */
.home-body { flex: 1; display: flex; flex-direction: column; gap: 16px; padding: 8px 32px 0; }
.preset-card { background: var(--bg-secondary); border-radius: var(--radius-md); padding: 16px 22px; }
.preset-row { display: flex; justify-content: space-between; align-items: baseline; padding: 6px 0; }
.preset-k { font-size: 20px; color: var(--text-secondary); }
.preset-v { font-size: 26px; font-weight: 700; color: var(--text-primary); }
.preset-total { margin-top: 8px; padding-top: 10px; border-top: 1px solid var(--bg-tertiary); font-size: 18px; color: var(--accent); text-align: right; }

/* ---------- Setup ---------- */
.setup-body { flex: 1; display: flex; flex-direction: column; gap: 14px; padding: 8px 32px 24px; }
.preset-chips { display: flex; gap: 12px; }
.chip {
  flex: 1; min-height: 60px; background: var(--bg-tertiary); color: var(--text-secondary);
  border-radius: var(--radius-md); font-size: 20px; font-weight: 700;
  border: 2px solid transparent; display: flex; align-items: center; justify-content: center;
}
.stepper {
  display: flex; align-items: center; justify-content: space-between;
  background: var(--bg-secondary); border-radius: var(--radius-md);
  padding: 14px 22px; min-height: 84px; border: 2px solid transparent;
}
.step-label { font-size: 24px; font-weight: 600; color: var(--text-secondary); }
.step-ctrl { display: flex; align-items: center; gap: 18px; }
.step-arrow { font-size: 24px; color: var(--text-muted); }
.stepper:focus .step-arrow { color: var(--accent); }
.step-val { font-size: 32px; font-weight: 800; min-width: 110px; text-align: center; }

/* ---------- Workout ---------- */
.wk-top { padding: 22px 0 4px; text-align: center; }
#wk-round { font-size: 24px; font-weight: 700; letter-spacing: 2px; color: var(--text-secondary); }
.wk-ring-wrap { flex: 1; position: relative; display: flex; align-items: center; justify-content: center; }
.ring-svg { width: 400px; height: 400px; transform: rotate(-90deg); }
.ring-track { fill: none; stroke: var(--bg-tertiary); stroke-width: 18; }
.ring-prog {
  fill: none; stroke: var(--accent); stroke-width: 18; stroke-linecap: round;
  stroke-dasharray: 1005.3; stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.12s linear;
}
#workout[data-phase="work"] .ring-prog { stroke: var(--accent-secondary); }
#workout[data-phase="rest"] .ring-prog { stroke: var(--accent); }
#workout[data-phase="prep"] .ring-prog { stroke: var(--prep); }
.wk-center {
  position: absolute; top: 0; left: 0; right: 0; bottom: 0;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
}
.wk-phase { font-size: 28px; font-weight: 800; letter-spacing: 3px; }
#workout[data-phase="work"] .wk-phase { color: var(--accent-secondary); }
#workout[data-phase="rest"] .wk-phase { color: var(--accent); }
#workout[data-phase="prep"] .wk-phase { color: var(--prep); }
.wk-time { font-size: 132px; font-weight: 800; line-height: 1; font-variant-numeric: tabular-nums; }
.wk-next { font-size: 18px; color: var(--text-muted); height: 22px; }
.wk-controls { display: flex; gap: 16px; padding: 0 32px 28px; }

/* ---------- Done ---------- */
.done-body { flex: 1; display: flex; flex-direction: column; gap: 16px; padding: 8px 32px 24px; }
.stat-grid { display: flex; gap: 12px; margin-bottom: 8px; }
.stat-box { flex: 1; background: var(--bg-secondary); border-radius: var(--radius-md); padding: 22px 8px; text-align: center; }
.stat-num { font-size: 38px; font-weight: 800; color: var(--accent-secondary); font-variant-numeric: tabular-nums; }
.stat-lbl { font-size: 16px; color: var(--text-secondary); margin-top: 6px; }
.done-body .btn { margin-top: auto; }
.done-body .btn-primary { margin-top: 8px; }

.paused .wk-time { color: var(--text-muted); }