:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --danger: #dc2626;
  --card-bg: #f9fafb;

  /* Muscle-freshness meter, red -> green, validated separately per mode
     (light/dark aren't a flat flip of each other -- see the color-picking
     session; light surface #f9fafb, dark surface #191b20). */
  --band0: #b91c1c;
  --band1: #e5481e;
  --band2: #d97706;
  --band3: #eab308;
  --band4: #79ba2e;
  --band5: #16a34a;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --fg: #e8e8ea;
    --muted: #9aa0a6;
    --border: #2a2d34;
    --accent: #4f8cff;
    --danger: #f87171;
    --card-bg: #191b20;

    --band0: #b11216;
    --band1: #fd4811;
    --band2: #d97706;
    --band3: #eab308;
    --band4: #8bc23f;
    --band5: #16a34a;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--fg);
  padding-bottom: 4rem;
}

main {
  max-width: 480px;
  margin: 0 auto;
  padding: 1rem 1rem 6rem;
}

h1 {
  font-size: 1.4rem;
  margin: 0.5rem 0 1rem;
}

.topnav {
  display: flex;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: var(--bg);
  z-index: 10;
  overflow-x: auto;
  white-space: nowrap;
}
.topnav a {
  color: var(--fg);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
  flex-shrink: 0;
}
.logout-form {
  margin: 0 0 0 auto;
  flex-shrink: 0;
}
.logout-btn {
  background: transparent;
  border: none;
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0;
  cursor: pointer;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  margin-bottom: 0.75rem;
}
label { font-size: 0.85rem; color: var(--muted); }

input, select, textarea, button {
  font-size: 1rem;
  padding: 0.55rem 0.6rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--fg);
}

button {
  cursor: pointer;
  font-weight: 600;
  border: none;
}
button.primary {
  background: var(--accent);
  color: white;
  width: 100%;
  padding: 0.9rem;
}
button.secondary {
  background: var(--card-bg);
  border: 1px solid var(--border);
  color: var(--fg);
  width: 100%;
  margin: 0.5rem 0;
}
button.small { padding: 0.4rem 0.6rem; font-size: 0.85rem; width: auto; }

.block {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  margin-bottom: 1rem;
  background: var(--card-bg);
}
.block-header {
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.block-header .exercise-select { flex: 1; }
.remove-block {
  background: transparent;
  color: var(--danger);
  border: none;
  font-size: 0.8rem;
  white-space: nowrap;
}

.set-row {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}
.set-label {
  font-size: 0.8rem;
  color: var(--muted);
  min-width: 2.6rem;
}
.set-row input.num-input {
  width: 4.2rem;
}
.set-row input.rpe-input {
  width: 3.5rem;
}
.set-row input.note-input {
  flex: 1;
  min-width: 5rem;
}
.failure-label {
  display: flex;
  align-items: center;
  gap: 0.2rem;
  font-size: 0.72rem;
  color: var(--muted);
  white-space: nowrap;
  border: none;
  background: transparent;
  padding: 0;
}
.failure-label input { width: auto; padding: 0; }

.remove-row {
  background: transparent;
  color: var(--danger);
  border: none;
  padding: 0.2rem 0.4rem;
}

.template-bar {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 0.75rem;
}
.template-bar select { flex: 1; }

.page-header-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}
.page-header-row h1 { margin-bottom: 0; }
.secondary-link {
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
}

.metric-tabs {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}
.metric-tab {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--muted);
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem;
}
.metric-tab.active {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--card-bg));
}

.chart-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  background: var(--card-bg);
  position: relative;
}
#chart-svg { width: 100%; height: auto; display: block; }
.chart-grid { stroke: var(--border); stroke-width: 1; }
.chart-axis-label { fill: var(--muted); font-size: 7px; }
.chart-line { fill: none; stroke: var(--accent); stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.chart-point { fill: var(--card-bg); stroke: var(--accent); stroke-width: 2; }
.chart-point-pr { fill: var(--accent); }
.chart-hit { fill: transparent; cursor: pointer; }

.chart-tooltip {
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.55rem;
  font-size: 0.78rem;
  pointer-events: none;
  min-width: 7rem;
}
.chart-tooltip-date { color: var(--muted); font-size: 0.7rem; }
.chart-tooltip-val { font-weight: 700; }
.chart-tooltip-detail { font-size: 0.7rem; margin-top: 0.1rem; }

.chart-summary { margin-top: 0.75rem; }
.summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  padding: 0.2rem 0;
}

.muscle-diagram {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.75rem;
  margin-bottom: 1rem;
  background: var(--card-bg);
}
.body-views {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 0.5rem;
}
.body-svg {
  width: 34%;
  max-width: 135px;
}
.body-svg .body-label {
  font-size: 7px;
  fill: var(--muted);
  text-anchor: middle;
}
.body-svg polygon {
  stroke: var(--card-bg);
  stroke-width: 0.4;
}
.body-svg .mg-neutral {
  fill: var(--border);
}
.cardio-badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  font-size: 0.75rem;
}
.cardio-circle {
  width: 2.2rem;
  height: 2.2rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
}
.muscle-legend {
  margin-top: 0.75rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.15rem 0.75rem;
}
.legend-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  padding: 0.15rem 0;
}
.legend-dot {
  width: 0.7rem;
  height: 0.7rem;
  border-radius: 50%;
  flex-shrink: 0;
}
.legend-name {
  flex: 1;
}
.legend-score {
  font-weight: 600;
  min-width: 1.6rem;
  text-align: right;
}
.legend-days {
  min-width: 4.2rem;
  text-align: right;
  font-size: 0.7rem;
}

.equip-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  margin-top: 0.5rem;
}
.equip-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--fg);
  min-width: 45%;
}
.equip-item input { width: auto; padding: 0; }

.form-tips {
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.4rem;
  padding: 0.4rem 0.5rem;
  border-left: 3px solid var(--accent);
  background: transparent;
}
.form-images {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.form-images img {
  width: 48%;
  max-width: 160px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: #fff;
}

.new-exercise-form {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.5rem;
  flex-wrap: wrap;
}

.sticky-save {
  position: sticky;
  bottom: 0;
  background: var(--bg);
  padding: 0.75rem 0;
}

.card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.85rem;
  margin-bottom: 0.85rem;
  background: var(--card-bg);
}
.center-card {
  margin-top: 3rem;
  text-align: center;
}
.center-card form {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-top: 1rem;
}
.center-note { margin-top: 1rem; }

.session-card .session-header { display: flex; justify-content: space-between; align-items: center; }
.session-actions { display: flex; align-items: center; gap: 0.75rem; }
.session-actions .edit-link { color: var(--accent); font-size: 0.85rem; text-decoration: none; font-weight: 600; }
.delete-form { display: inline; margin: 0; }
.delete-link {
  background: transparent;
  border: none;
  color: var(--danger);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0;
  cursor: pointer;
}
.sets-table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; font-size: 0.9rem; }
.sets-table td { padding: 0.2rem 0.3rem; border-bottom: 1px solid var(--border); }

.delete-workout-btn {
  color: var(--danger);
  border-color: var(--danger);
}

.welcome-msg {
  color: var(--muted);
  font-size: 0.9rem;
  margin: 0 0 0.25rem;
}

.danger-zone {
  margin-top: 2rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.danger-zone h2 { color: var(--danger); }

.failure-badge {
  display: inline-block;
  background: var(--danger);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  border-radius: 4px;
  padding: 0.05rem 0.3rem;
}

.muted { color: var(--muted); font-size: 0.85rem; }
.error { color: var(--danger); }