:root {
  --bg: #0f1115;
  --surface: #171a21;
  --surface-2: #1f232c;
  --border: #2a2f3a;
  --text: #e8eaf0;
  --text-muted: #8b91a3;
  --accent: #6ee7b7;
  --accent-dim: #2c4a3e;
  --push: #f59e0b;
  --pull: #60a5fa;
  --legs: #f472b6;
  --muaythai: #ef4444;
  --cardio: #a78bfa;
  --rest: #3a3f4b;
  --chest: #22d3ee;
  --back: #818cf8;
  --shoulder: #fb923c;
  --arms: #a3e635;
  --core: #facc15;
  --danger: #f87171;
  --radius: 12px;
  --radius-sm: 8px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 32px;
  font-synthesis: none;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", Roboto, sans-serif;
  font-size: 15px;
  line-height: 1.5;
}

a { color: inherit; text-decoration: none; }

.app {
  max-width: 640px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-3) 96px;
}

header.top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

header.top h1 {
  font-size: 20px;
  font-weight: 700;
  margin: 0;
}

header.top .date {
  color: var(--text-muted);
  font-size: 13px;
}

nav.tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding-bottom: env(safe-area-inset-bottom, 0);
  z-index: 10;
}

nav.tabbar a {
  flex: 1;
  text-align: center;
  padding: 10px 4px 8px;
  font-size: 11px;
  color: var(--text-muted);
}

nav.tabbar a .icon { display: block; font-size: 20px; margin-bottom: 2px; }
nav.tabbar a.active { color: var(--accent); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
}

.card h2 {
  font-size: 15px;
  font-weight: 600;
  margin: 0 0 var(--space-2);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--accent);
  color: #0a1a13;
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.btn.secondary {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn.danger {
  background: transparent;
  color: var(--danger);
  border: 1px solid var(--danger);
}

.btn:disabled { opacity: 0.5; cursor: default; }
.btn-row { display: flex; gap: var(--space-2); }
.btn.block { width: 100%; }

input, select, textarea {
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 9px 10px;
  font-size: 14px;
  font-family: inherit;
  width: 100%;
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
}

label {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: var(--space-1);
}

.field { margin-bottom: var(--space-3); }
.field-row { display: flex; gap: var(--space-2); }
.field-row .field { flex: 1; }

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 600;
}

.badge.Push { background: color-mix(in srgb, var(--push) 20%, transparent); color: var(--push); }
.badge.Pull { background: color-mix(in srgb, var(--pull) 20%, transparent); color: var(--pull); }
.badge.Legs { background: color-mix(in srgb, var(--legs) 20%, transparent); color: var(--legs); }
.badge.MuayThai { background: color-mix(in srgb, var(--muaythai) 20%, transparent); color: var(--muaythai); }
.badge.Cardio { background: color-mix(in srgb, var(--cardio) 20%, transparent); color: var(--cardio); }
.badge.Rest { background: var(--rest); color: var(--text-muted); }
.badge.Chest { background: color-mix(in srgb, var(--chest) 20%, transparent); color: var(--chest); }
.badge.Back { background: color-mix(in srgb, var(--back) 20%, transparent); color: var(--back); }
.badge.Shoulder { background: color-mix(in srgb, var(--shoulder) 20%, transparent); color: var(--shoulder); }
.badge.Arms { background: color-mix(in srgb, var(--arms) 20%, transparent); color: var(--arms); }
.badge.Core { background: color-mix(in srgb, var(--core) 20%, transparent); color: var(--core); }

.exercise-group summary {
  cursor: pointer;
  padding: var(--space-2) 0;
  font-weight: 600;
  color: var(--text);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.exercise-group summary::-webkit-details-marker { display: none; }
.exercise-group summary .chev { color: var(--text-muted); transition: transform 0.15s; }
.exercise-group[open] summary .chev { transform: rotate(90deg); }

.exercise-row {
  padding: var(--space-2) 0;
  border-top: 1px solid var(--border);
}
.exercise-row .name { font-size: 13.5px; margin-bottom: var(--space-2); }
.sets-grid { display: flex; gap: var(--space-2); flex-wrap: wrap; }
.set-input { width: 64px; text-align: center; }
.set-input-wrap { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.set-input-wrap .set-label { font-size: 10px; color: var(--text-muted); }

/* Calendar */
.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}
.cal-day {
  aspect-ratio: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  font-size: 12px;
  background: var(--surface-2);
  color: var(--text-muted);
  position: relative;
}
.cal-day.blank { background: transparent; }
.cal-day.Push { background: color-mix(in srgb, var(--push) 55%, var(--surface-2)); color: #1a1204; }
.cal-day.Pull { background: color-mix(in srgb, var(--pull) 55%, var(--surface-2)); color: #051224; }
.cal-day.Legs { background: color-mix(in srgb, var(--legs) 55%, var(--surface-2)); color: #240414; }
.cal-day.MuayThai { background: color-mix(in srgb, var(--muaythai) 55%, var(--surface-2)); color: #240404; }
.cal-day.Cardio { background: color-mix(in srgb, var(--cardio) 55%, var(--surface-2)); color: #14042e; }
.cal-day.Chest { background: color-mix(in srgb, var(--chest) 55%, var(--surface-2)); color: #042024; }
.cal-day.Back { background: color-mix(in srgb, var(--back) 55%, var(--surface-2)); color: #0a0a2e; }
.cal-day.Shoulder { background: color-mix(in srgb, var(--shoulder) 55%, var(--surface-2)); color: #241404; }
.cal-day.Arms { background: color-mix(in srgb, var(--arms) 55%, var(--surface-2)); color: #142404; }
.cal-day.Core { background: color-mix(in srgb, var(--core) 55%, var(--surface-2)); color: #242004; }
.cal-day.Other { background: color-mix(in srgb, var(--accent) 45%, var(--surface-2)); color: #04241a; }

.legend { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-3); font-size: 12px; color: var(--text-muted); }
.legend .dot { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; vertical-align: middle; }

.month-nav { display: flex; align-items: center; justify-content: space-between; margin-bottom: var(--space-3); }
.month-nav button { background: none; border: none; color: var(--text); font-size: 18px; cursor: pointer; padding: 4px 12px; }
.month-nav .label { font-weight: 600; }

.stat-row { display: flex; gap: var(--space-3); margin-top: var(--space-3); }
.stat { flex: 1; text-align: center; }
.stat .n { font-size: 22px; font-weight: 700; }
.stat .l { font-size: 11px; color: var(--text-muted); }

.muted { color: var(--text-muted); }
.empty-state { text-align: center; padding: var(--space-5) var(--space-3); color: var(--text-muted); }