:root {
  --bg: #0f1420;
  --panel: #171e2e;
  --panel-2: #1f2840;
  --text: #eef1f7;
  --muted: #8b93a7;
  --accent: #3ddc97;
  --accent-2: #4f8dff;
  --danger: #ff5d5d;
  --border: #2a3350;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  height: 100%;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

.topbar h1 {
  font-size: 20px;
  margin: 0;
  letter-spacing: 0.5px;
}

.pill {
  font-size: 12px;
  padding: 4px 10px;
  border-radius: 999px;
  font-weight: 600;
}
.pill-off { background: rgba(255,93,93,0.15); color: var(--danger); }
.pill-on { background: rgba(61,220,151,0.15); color: var(--accent); }

main {
  max-width: 520px;
  margin: 0 auto;
  padding: 20px 16px 60px;
}

.screen { display: none; }
.screen.active { display: block; }

h2 { font-size: 18px; margin: 4px 0 16px; color: var(--muted); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
h3 { font-size: 15px; margin: 0 0 12px; color: var(--muted); }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
}

.btn {
  display: inline-block;
  font-size: 16px;
  font-weight: 600;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  cursor: pointer;
  text-align: center;
}
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn-block { display: block; width: 100%; margin-bottom: 14px; }
.btn-primary { background: var(--accent-2); border-color: var(--accent-2); color: #08101f; }
.btn-success { background: var(--accent); border-color: var(--accent); color: #08101f; }
.btn-danger { background: var(--danger); border-color: var(--danger); color: #1a0505; }
.btn-small { padding: 8px 14px; font-size: 13px; }

.muted { color: var(--muted); font-size: 13px; }

.field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 14px;
}
.field.switch input { width: 20px; height: 20px; }
.field input[type="text"] {
  flex: 1;
  margin-left: 12px;
  padding: 10px 12px;
  font-size: 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.stepper {
  display: flex;
  align-items: center;
  gap: 8px;
}
.stepper input {
  width: 56px;
  text-align: center;
  font-size: 18px;
  padding: 8px 4px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.btnStep {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 18px;
  cursor: pointer;
}

.history-list { display: flex; flex-direction: column; gap: 8px; }
.history-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  background: var(--panel-2);
  border-radius: 10px;
  font-size: 13px;
}
.history-item button { font-size: 12px; padding: 6px 10px; }
.history-item .item-actions { display: flex; gap: 6px; }

.segment-form {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 12px;
}
.segment-form label {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--muted);
}
.segment-form input {
  width: 64px;
  text-align: center;
  font-size: 16px;
  padding: 8px 4px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}
.segment-form button { align-self: flex-end; }

.program-banner { border-color: var(--accent-2); }
.program-banner .metro-row { margin-bottom: 4px; font-weight: 700; }

.metrics-grid { margin-bottom: 16px; }

.metrics-row {
  display: grid;
  gap: 10px;
  margin-bottom: 10px;
}
.metrics-row.row-3 { grid-template-columns: repeat(3, 1fr); }
.metrics-row.row-2 { grid-template-columns: repeat(2, 1fr); }

.metric {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px 10px;
  text-align: center;
}
.metric-value {
  display: block;
  font-size: 28px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.metric-label {
  display: block;
  font-size: 11px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 4px;
}

.metrics-row.row-2 .metric { padding: 26px 10px; }
.metrics-row.row-2 .metric-value { font-size: 46px; }
.metrics-row.row-2 .metric-label { font-size: 13px; }

/* iPad / pantallas anchas en horizontal: todo visible sin scroll */
@media (min-width: 820px) {
  main { max-width: 1100px; }

  #screen-workout.active {
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 90px);
  }

  .metrics-grid {
    display: flex;
    flex-direction: column;
    flex: 1;
    gap: 16px;
    margin-bottom: 0;
  }

  .metrics-row {
    flex: 1;
    margin-bottom: 0;
  }

  .metric {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }
  .metric-value { font-size: 60px; }
  .metric-label { font-size: 14px; }

  .metrics-row.row-2 .metric-value { font-size: 96px; }
  .metrics-row.row-2 .metric-label { font-size: 16px; }

  .metro-card, .workout-actions { margin-top: 16px; }

  .metro-arrow { width: 76px; height: 76px; font-size: 40px; }
  .metro-bpm { font-size: 34px; }
}

.metro-card { }
.metro-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  font-size: 14px;
}

.metro-control {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.metro-arrow {
  flex: 0 0 auto;
  width: 60px;
  height: 60px;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: var(--panel-2);
  color: var(--text);
  font-size: 30px;
  font-weight: 700;
  cursor: pointer;
  line-height: 1;
}
.metro-arrow:active { background: var(--accent-2); color: #08101f; }

.metro-bpm {
  flex: 1;
  text-align: center;
  font-size: 26px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.workout-actions { margin-top: 8px; }

#summaryBox .summary-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
#summaryBox .summary-row:last-child { border-bottom: none; }