:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --text: #f0f0f2;
  --muted: #9aa0ab;
  --accent: #4f8cff;
  --good: #3ecf8e;
  --warn: #f5a623;
  --bad: #ef5350;
  --border: #2a2e37;
}
@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --card: #ffffff;
    --text: #1a1d24;
    --muted: #666d78;
    --accent: #2563eb;
    --border: #e2e4e9;
  }
}
* { box-sizing: border-box; }
html, body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
}
body { padding-bottom: 80px; }
a { color: var(--accent); }
header.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px;
  background: var(--card);
  border-bottom: 1px solid var(--border);
}
header.topbar h1 { font-size: 1.1rem; margin: 0; }
header.topbar a.logout { font-size: 0.85rem; color: var(--muted); text-decoration: none; }
main { max-width: 560px; margin: 0 auto; padding: 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
  margin-bottom: 14px;
}
h2 { font-size: 1rem; margin: 0 0 10px; }
.muted { color: var(--muted); font-size: 0.85rem; }
.badge {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: 0.75rem; font-weight: 600;
}
.badge.warn { background: rgba(245,166,35,0.15); color: var(--warn); }
.badge.good { background: rgba(62,207,142,0.15); color: var(--good); }
.badge.bad { background: rgba(239,83,80,0.15); color: var(--bad); }
label { display: block; margin: 10px 0 4px; font-size: 0.85rem; color: var(--muted); }
input, select, textarea {
  width: 100%;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 1rem;
}
textarea { min-height: 70px; }
button, .btn {
  display: inline-block;
  margin-top: 14px;
  padding: 12px 18px;
  border: none;
  border-radius: 10px;
  background: var(--accent);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
}
button.secondary, .btn.secondary { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
button.danger { background: var(--bad); }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
.list-item {
  display: flex; justify-content: space-between; align-items: center;
  padding: 10px 0; border-bottom: 1px solid var(--border);
}
.list-item:last-child { border-bottom: none; }
.exercise-block { border-top: 1px solid var(--border); padding-top: 12px; margin-top: 12px; }
.exercise-block h3 { margin: 0 0 6px; font-size: 0.95rem; }
.set-row { display: grid; grid-template-columns: 28px 1fr 1.6fr; gap: 8px; align-items: center; margin-bottom: 6px; }
.set-row span { color: var(--muted); font-size: 0.85rem; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
th, td { text-align: left; padding: 6px 4px; border-bottom: 1px solid var(--border); }
nav.bottom {
  position: fixed; bottom: 0; left: 0; right: 0;
  display: flex; background: var(--card); border-top: 1px solid var(--border);
  padding: 6px 0 max(6px, env(safe-area-inset-bottom));
}
nav.bottom a {
  flex: 1; text-align: center; color: var(--muted); text-decoration: none; font-size: 0.75rem;
  padding: 6px 0;
}
nav.bottom a.active { color: var(--accent); }
.error { color: var(--bad); font-size: 0.85rem; margin-top: 8px; }