:root {
  --text: #4b5563;
  --text-h: #0f172a;
  --bg: #f8fafc;
  --card-bg: #ffffff;
  --border: #e2e8f0;
  --accent: #ea580c;
  --accent-contrast: #ffffff;
  --danger: #dc2626;

  --sans: system-ui, 'Segoe UI', Roboto, sans-serif;
  font: 16px/1.45 var(--sans);
  color-scheme: light dark;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #cbd5e1;
    --text-h: #f8fafc;
    --bg: #0f1115;
    --card-bg: #1a1d24;
    --border: #2b2f3a;
    --accent: #fb923c;
    --accent-contrast: #1a1d24;
    --danger: #f87171;
  }
}

* {
  box-sizing: border-box;
}

/* Varias listas son flex, y eso le gana al display:none del atributo hidden
   que usa el JS para mostrar/ocultar bloques. */
[hidden] {
  display: none !important;
}

body {
  margin: 0;
}

h1, h2, h3 {
  color: var(--text-h);
  margin: 0 0 8px;
}

input, select, button {
  font: inherit;
}

button {
  cursor: pointer;
}

.app-shell {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  max-width: 640px;
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
}

.brand {
  font-weight: 700;
  font-size: 20px;
  color: var(--accent);
}

.content {
  flex: 1;
  padding: 16px;
  padding-bottom: 88px;
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  max-width: 640px;
  margin: 0 auto;
  display: flex;
  border-top: 1px solid var(--border);
  background: var(--card-bg);
}

.bottom-nav a {
  flex: 1;
  text-align: center;
  padding: 14px 0;
  text-decoration: none;
  color: var(--text);
  font-size: 14px;
}

.bottom-nav a.active {
  color: var(--accent);
  font-weight: 600;
}

.link-btn {
  background: none;
  border: none;
  color: var(--accent);
  padding: 4px 8px;
}

.link-btn.small {
  font-size: 12px;
  margin-left: 8px;
}

.link-btn.danger {
  color: var(--danger);
}

.error {
  color: var(--danger);
  margin: 8px 0;
}

.empty-state {
  color: var(--text);
  opacity: 0.7;
  margin: 16px 0;
}

/* Login */
.login-screen {
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.login-card {
  width: 100%;
  max-width: 340px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.login-card h1 {
  text-align: center;
  color: var(--accent);
}

.login-card .subtitle {
  text-align: center;
  margin-bottom: 20px;
  opacity: 0.8;
}

.login-card label {
  font-size: 13px;
  margin-top: 12px;
}

.login-card input {
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text-h);
  margin-top: 4px;
}

.login-card button {
  margin-top: 20px;
  padding: 12px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

/* Train page */
.train-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}

.train-controls label {
  font-size: 12px;
  display: block;
  margin-bottom: 4px;
  opacity: 0.8;
}

.train-controls input,
.train-controls select {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--text-h);
}

.exercise-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.exercise-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.last-ref {
  font-size: 13px;
  opacity: 0.75;
  margin-bottom: 10px;
}

.today-sets {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 14px;
}

.add-set-form {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr auto;
  gap: 8px;
}

/* En pantallas angostas los tres campos no entran junto al botón:
   se quedan en una fila y el botón pasa abajo, a lo ancho. */
@media (max-width: 480px) {
  .add-set-form {
    grid-template-columns: 1fr 1fr 1fr;
  }

  .add-set-form button {
    grid-column: 1 / -1;
  }
}

.add-set-form input {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text-h);
  width: 100%;
  min-width: 0;
}

.add-set-form button {
  padding: 10px 14px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
  white-space: nowrap;
}

/* Manage page */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.tabs button {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--text);
}

.tabs button.active {
  background: var(--accent);
  color: var(--accent-contrast);
  border-color: var(--accent);
}

.manager-form {
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 16px;
}

.manager-form input {
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  color: var(--text-h);
}

.field-label {
  font-size: 13px;
  opacity: 0.8;
  margin: 4px 0 0;
}

.checkbox-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
}

.checkbox-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

/* Lista ordenable: el orden de los ejercicios dentro de una rutina */
.orden-list {
  list-style: none;
  padding: 0;
  margin: 6px 0 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.orden-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  font-size: 14px;
  user-select: none;
  cursor: grab;
  /* Que el gesto arrastre el ejercicio y no scrollee la página */
  touch-action: none;
}

.orden-item.dragging {
  border-color: var(--accent);
  cursor: grabbing;
  opacity: 0.65;
}

.drag-handle {
  opacity: 0.5;
  font-size: 18px;
  line-height: 1;
}

.form-actions {
  display: flex;
  gap: 8px;
}

.form-actions button {
  padding: 10px 16px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

.form-actions button.secondary {
  background: none;
  border: 1px solid var(--border);
  color: var(--text);
}

.manager-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.manager-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
}

.muted {
  opacity: 0.7;
  font-size: 13px;
}

.row-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

/* History page */
.history-page label {
  font-size: 13px;
  display: block;
  margin-bottom: 4px;
  opacity: 0.8;
}

.history-page select,
.history-page input[type='date'] {
  width: 100%;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-bg);
  color: var(--text-h);
  margin-bottom: 16px;
}

.chart-wrapper {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px;
  margin-bottom: 16px;
}

/* Un mini-gráfico por métrica (peso, reps, series), cada uno con su escala */
.chart-facet + .chart-facet {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.chart-facet-title {
  font-size: 12px;
  opacity: 0.8;
  margin-bottom: 2px;
}

.progress-chart {
  width: 100%;
  height: auto;
  display: block;
}

.chart-label {
  font-size: 10px;
  fill: var(--text);
}

.history-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.history-list li {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px 16px;
}

.history-date {
  font-weight: 600;
  color: var(--text-h);
  margin-bottom: 4px;
  font-size: 14px;
}

.history-sets {
  font-size: 13px;
  opacity: 0.85;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.history-set-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}