:root {
  color-scheme: light dark;
  --border: #d0d4da;
  --bg-panel: #f7f8fa;
  --accent: #3568d4;
  --danger: #c0392b;
}

@media (prefers-color-scheme: dark) {
  :root {
    --border: #3a3f47;
    --bg-panel: #1c1f24;
  }
}

* { box-sizing: border-box; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem;
  color: inherit;
}

header {
  margin-bottom: 1.5rem;
}

.subtitle {
  color: #8a8f98;
  font-size: 0.9rem;
}

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

#chart-panel {
  grid-column: 1 / -1;
}

.panel {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.25rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.9rem;
}

input, select, textarea, button {
  font: inherit;
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: transparent;
  color: inherit;
}

button {
  background: var(--accent);
  color: white;
  border: none;
  cursor: pointer;
  padding: 0.6rem;
  font-weight: 600;
}

button:hover {
  opacity: 0.9;
}

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

#workout-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  max-height: 480px;
  overflow-y: auto;
}

.workout-item {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.6rem 0.8rem;
  cursor: pointer;
}

.workout-item:hover {
  border-color: var(--accent);
}

.workout-item.selected {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent);
}

.workout-item .category {
  font-weight: 600;
  text-transform: capitalize;
}

.workout-item .meta {
  font-size: 0.8rem;
  color: #8a8f98;
}

.window-control {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin-bottom: 0.75rem;
  max-width: 320px;
}

.window-control input {
  width: 5rem;
}

#chart-placeholder {
  color: #8a8f98;
}