:root {
  color-scheme: dark;
  --bg: #090b10;
  --panel: #121723;
  --panel-2: #171e2c;
  --text: #f2f5fb;
  --muted: #9aa7bd;
  --accent: #7dd3fc;
  --accent-2: #a7f3d0;
  --danger: #fca5a5;
  --line: #273244;
  --shadow: 0 18px 45px rgba(0,0,0,.35);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: radial-gradient(circle at top right, rgba(125, 211, 252, .13), transparent 32rem), var(--bg);
  color: var(--text);
  min-height: 100vh;
  padding-bottom: env(safe-area-inset-bottom);
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 2;
  backdrop-filter: blur(16px);
  background: rgba(9, 11, 16, .82);
  border-bottom: 1px solid rgba(255,255,255,.07);
  padding: calc(14px + env(safe-area-inset-top)) 16px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

h1, h2, p { margin: 0; }
h1 { font-size: 1.35rem; line-height: 1.1; }
h2 { font-size: 1rem; margin-bottom: 12px; }
.eyebrow { color: var(--accent); text-transform: uppercase; font-size: .72rem; letter-spacing: .12em; margin-bottom: 4px; }
.muted, #chartSubtitle { color: var(--muted); font-size: .9rem; line-height: 1.35; }
.page-tabs { display: inline-flex; gap: 4px; padding: 3px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.035); }
.page-tab { color: var(--muted); text-decoration: none; font-size: .78rem; font-weight: 700; padding: 7px 10px; border-radius: 999px; }
.page-tab.active { color: var(--text); background: linear-gradient(135deg, rgba(167,243,208,.20), rgba(125,211,252,.16)); border: 1px solid rgba(167,243,208,.22); }

main { padding: 14px; max-width: 860px; margin: 0 auto; }
.card {
  background: linear-gradient(180deg, rgba(255,255,255,.035), transparent), var(--panel);
  border: 1px solid rgba(255,255,255,.07);
  border-radius: 20px;
  padding: 16px;
  margin-bottom: 14px;
  box-shadow: var(--shadow);
}

.controls { display: grid; gap: 12px; }
.progress-controls { display: grid; gap: 14px; }
.exercise-picker { display: grid; gap: 9px; }
.control-label, label { display: grid; gap: 7px; color: var(--muted); font-size: .82rem; }
input, select, button {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--panel-2);
  color: var(--text);
  padding: 11px 12px;
  font: inherit;
}
button.ghost { width: auto; padding: 9px 12px; background: rgba(255,255,255,.04); }
.exercise-chips, .metric-buttons { display: flex; flex-wrap: wrap; gap: 8px; padding-bottom: 2px; }
.exercise-chips::-webkit-scrollbar, .metric-buttons::-webkit-scrollbar { display: none; }
.choice-chip, .metric-button {
  width: auto;
  flex: 0 0 auto;
  border-radius: 999px;
  padding: 8px 11px;
  background: rgba(255,255,255,.035);
  color: var(--muted);
  font-size: .8rem;
  white-space: nowrap;
}
.choice-chip.active, .metric-button.active {
  color: var(--text);
  border-color: rgba(125,211,252,.45);
  background: rgba(125,211,252,.14);
}
.metric-picker { display: grid; gap: 8px; }
.empty-state.compact { padding: 8px 10px; font-size: .78rem; }

.chart { width: 100%; min-height: 280px; overflow: visible; }
.chart > svg { width: 100%; height: 260px; display: block; }
.axis, .grid { stroke: var(--line); stroke-width: 1; }
.line { fill: none; stroke: var(--accent); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.dot-shape { fill: var(--accent-2); stroke: var(--bg); stroke-width: 2; }
.dot-shape.match { fill: #0072b2; }
.dot-shape.over { fill: #f0e442; stroke: #111827; stroke-width: 2.5; }
.dot-shape.under { fill: #d55e00; stroke: #fef3c7; stroke-width: 2.5; }
.note-ring { fill: none; stroke: #ffffff; stroke-width: 2.5; stroke-dasharray: 3 2; vector-effect: non-scaling-stroke; }
.chart-dot { cursor: pointer; }
.chart-dot:focus { outline: none; }
.chart-dot:focus .dot-shape { stroke: var(--text); stroke-width: 4; }
.chart-dot:hover .dot-shape { filter: brightness(1.18); }
.chart-label { fill: var(--muted); font-size: 11px; }
.value-label { fill: var(--text); font-size: 12px; font-weight: 650; }
.chart-legend { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 14px; margin-top: 4px; color: var(--muted); font-size: .78rem; }
.chart-legend span { display: inline-flex; align-items: center; gap: 4px; white-space: nowrap; }
.chart-legend svg { width: 14px; height: 14px; overflow: visible; }

.workout-detail { border-top: 1px solid var(--line); padding: 6px 0; scroll-margin-top: calc(84px + env(safe-area-inset-top)); }
.workout-detail:first-child { border-top: 0; padding-top: 0; }
.workout-summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 0;
}
.workout-summary::-webkit-details-marker { display: none; }
.chevron {
  color: var(--accent);
  font-size: 1.25rem;
  line-height: 1;
  transform: rotate(0deg);
  transition: transform .16s ease;
}
.workout-detail[open] > .workout-summary .chevron { transform: rotate(90deg); }
.workout-main { display: flex; align-items: center; justify-content: space-between; gap: 10px; width: 100%; min-width: 0; }
.workout-body { padding-bottom: 6px; }
.badge { color: var(--accent-2); background: rgba(167,243,208,.08); border: 1px solid rgba(167,243,208,.18); border-radius: 999px; padding: 2px 8px; font-size: .76rem; white-space: nowrap; }
.badge.warning { color: #fbbf24; background: rgba(251,191,36,.08); border-color: rgba(251,191,36,.25); }
.exercise-detail {
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 14px;
  background: rgba(255,255,255,.025);
  margin: 8px 0;
  overflow: hidden;
}
.exercise-detail summary,
.exercise-static-summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 8px;
  padding: 10px 32px 10px 12px;
  color: var(--muted);
  font-size: .86rem;
  line-height: 1.35;
}
.exercise-static-summary { cursor: default; }
.exercise-detail summary::-webkit-details-marker { display: none; }
.exercise-detail summary::after {
  content: "›";
  position: absolute;
  right: 12px;
  top: 50%;
  color: var(--accent);
  font-size: 1.15rem;
  line-height: 1;
  transform: translateY(-50%);
  transition: transform .16s ease;
}
.exercise-detail[open] summary::after { transform: translateY(-50%) rotate(90deg); }
.exercise-name { color: var(--text); font-weight: 700; text-decoration: none; }
.exercise-name::after { content: " ↗"; color: var(--accent); font-size: .78em; font-weight: 800; }
.exercise-name:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 6px; }
.set-summary { color: var(--muted); }
.set-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 0 10px 10px;
}
.set-card {
  flex: 1 1 150px;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 9px;
  display: grid;
  gap: 3px;
}
.set-card strong { font-size: .95rem; }
.set-card small { color: var(--muted); line-height: 1.25; }
.signals {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 10px 10px;
}
.signal {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.035);
  color: var(--muted);
  font-size: .75rem;
  padding: 4px 8px;
  white-space: nowrap;
}
.signal.good { color: #86efac; border-color: rgba(134,239,172,.28); background: rgba(34,197,94,.10); }
.signal.bad { color: #fca5a5; border-color: rgba(252,165,165,.30); background: rgba(239,68,68,.10); }
.signal.same { color: #cbd5e1; }
.signal.workout.good { color: #86efac; }
.signal.workout.bad { color: #fca5a5; }
.set-number {
  color: var(--accent-2);
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .08em;
}
.exercise-notes {
  color: var(--muted);
  font-size: .78rem;
  line-height: 1.35;
  padding: 0 12px 11px;
}
.uncertainties { margin-top: 8px; color: #fbbf24; font-size: .78rem; line-height: 1.35; }
.section-title-row { display: grid; gap: 10px; margin-bottom: 12px; }
.section-title-row h2 { margin-bottom: 0; }
.session-header-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.notation-control { display: inline-flex; align-items: center; gap: 7px; }
.notation-label { color: var(--muted); font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; }
.workout-filters { display: flex; flex-wrap: wrap; gap: 8px; }
.block-choice-list { display: grid; gap: 8px; }
.block-choice {
  text-align: left;
  display: grid;
  gap: 3px;
  background: rgba(255,255,255,.035);
  color: var(--muted);
  border-color: var(--line);
}
.block-choice strong { color: var(--text); font-size: .86rem; }
.block-choice span { font-size: .76rem; }
.block-choice.active { border-color: rgba(125,211,252,.48); background: rgba(125,211,252,.12); }
.block-choice.testing { border-style: dashed; }
.block-choice.testing strong { color: #fbbf24; }
.block-choice.blockless, .block-button.blockless { border-style: dashed; border-color: rgba(203,213,225,.28); color: var(--muted); }
.block-choice.blockless strong { color: var(--accent); }
.filter-chip { display: inline-flex; align-items: center; justify-content: center; gap: 6px; width: auto; min-width: 34px; padding: 6px 11px; border-radius: 999px; border: 1px solid var(--line); background: rgba(255,255,255,.025); color: var(--muted); font-size: .78rem; font-weight: 750; line-height: 1; cursor: pointer; user-select: none; }
.filter-chip.active { color: var(--accent-2); border-color: rgba(167,243,208,.32); background: rgba(167,243,208,.10); }
.filter-chip:focus-visible { outline: 2px solid rgba(125,211,252,.75); outline-offset: 2px; }
.format-toggle {
  position: relative;
  width: 138px;
  min-width: 138px;
  height: 32px;
  padding: 3px;
  border-radius: 999px;
  background: rgba(255,255,255,.045);
  border-color: var(--line);
  color: var(--muted);
  font-size: .72rem;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.format-toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: calc(50% - 3px);
  height: calc(100% - 6px);
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(167,243,208,.26), rgba(125,211,252,.20));
  border: 1px solid rgba(167,243,208,.28);
  box-shadow: 0 6px 18px rgba(0,0,0,.22);
  transition: transform .18s ease;
}
.format-toggle.reps-first .format-toggle-thumb { transform: translateX(100%); }
.format-toggle-option { position: relative; z-index: 1; flex: 1 1 0; text-align: center; font-weight: 700; line-height: 1; transition: color .18s ease; }
.format-toggle:not(.reps-first) .alberto-label,
.format-toggle.reps-first .piero-label { color: var(--text); }
.format-toggle:not(.reps-first) .piero-label,
.format-toggle.reps-first .alberto-label { color: var(--muted); }
.week-separator { display: flex; align-items: center; gap: 10px; color: var(--muted); font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; margin: 14px 0 6px; }
.week-separator::after { content: ""; height: 1px; background: var(--line); flex: 1; }
.empty-state { border: 1px dashed var(--line); border-radius: 14px; padding: 12px; color: var(--muted); }
.superset-block { position: relative; margin: 10px 0; padding-left: 14px; }
.superset-block::before { content: ""; position: absolute; left: 3px; top: 24px; bottom: 8px; width: 2px; border-radius: 999px; background: linear-gradient(var(--accent), var(--accent-2)); opacity: .85; }
.superset-label { color: var(--accent); font-size: .72rem; text-transform: uppercase; letter-spacing: .08em; margin: 0 0 6px; }
.superset-items .exercise-detail { margin: 6px 0; }
.block-timeline { display: grid; gap: 12px; }
.timeline-block { border-left: 3px solid var(--accent); padding-left: 12px; }
.timeline-block.testing { border-left-color: #fbbf24; }
.timeline-date { color: var(--accent); font-size: .74rem; text-transform: uppercase; letter-spacing: .08em; margin-bottom: 4px; }
.timeline-block.testing .timeline-date { color: #fbbf24; }
.timeline-block h3 { margin: 0 0 8px; font-size: .95rem; }
.testing-note { color: #fbbf24; font-size: .78rem; line-height: 1.35; margin-bottom: 8px; }
.change-list { display: grid; gap: 7px; }
.change-item { display: grid; gap: 2px; border: 1px solid var(--line); border-radius: 12px; padding: 8px; background: rgba(255,255,255,.025); }
.change-type { width: max-content; border-radius: 999px; padding: 2px 7px; font-size: .66rem; text-transform: uppercase; letter-spacing: .07em; color: var(--text); background: rgba(125,211,252,.15); }
.change-item.introduced .change-type { background: rgba(167,243,208,.16); }
.change-item.removed .change-type { background: rgba(252,165,165,.16); }
.change-item.changed .change-type { background: rgba(251,191,36,.16); }
.change-item small { color: var(--muted); line-height: 1.3; }
code { color: var(--accent-2); }

.block-picker { display: grid; gap: 8px; }
.block-buttons { display: flex; flex-wrap: wrap; gap: 8px; }
.block-button {
  width: auto;
  flex: 0 0 auto;
  border-radius: 999px;
  padding: 8px 11px;
  background: rgba(255,255,255,.035);
  color: var(--muted);
  font-size: .8rem;
  white-space: nowrap;
  border-color: var(--line);
}
.block-button.active {
  color: var(--text);
  border-color: rgba(125,211,252,.45);
  background: rgba(125,211,252,.14);
}
.block-button.testing { border-style: dashed; color: #fbbf24; }

.block-timeline { display: grid; gap: 12px; }
.change-summary { margin: 7px 0 4px; line-height: 1.4; }
.timeline-block.removed { border-left-color: #fca5a5; }
.timeline-block.changed { border-left-color: #fbbf24; }
.timeline-block.continued { border-left-color: var(--muted); }
.change-type.introduced { background: rgba(167,243,208,.16); }
.change-type.removed { background: rgba(252,165,165,.16); }
.change-type.changed { background: rgba(251,191,36,.16); }
.change-type.continued { background: rgba(203,213,225,.12); color: var(--muted); }

.reference-card { display: grid; gap: 10px; }
.reference-card h2 { margin-bottom: 4px; font-size: 1.1rem; }
.exercise-entry { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 6px 0; border-bottom: 1px solid rgba(255,255,255,.04); }
.exercise-entry:last-child { border-bottom: 0; }

@media (min-width: 680px) {
  main { padding: 22px; }
  .controls { display: flex; flex-wrap: wrap; }
  .section-title-row { display: flex; align-items: center; justify-content: space-between; }
  .workout-filters { justify-content: flex-end; }
  h1 { font-size: 1.65rem; }
}