:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #1c2026;
  --muted: #687080;
  --border: #dde1e7;
  --accent: #2563eb;
  --accent-text: #ffffff;
  --ok: #15803d;
  --warn: #b45309;
  --danger: #b91c1c;
  --plan: #9333ea;
  --chart-goal: #dc2626;
  --chart-done: #16a34a;
  --radius: 8px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12151a;
    --surface: #1b1f26;
    --text: #e6e8eb;
    --muted: #949cab;
    --border: #2d333d;
    --accent: #60a5fa;
    --accent-text: #0b1220;
    --ok: #4ade80;
    --warn: #fbbf24;
    --danger: #f87171;
    --plan: #c084fc;
    --chart-goal: #f87171;
    --chart-done: #4ade80;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.45 system-ui, -apple-system, "Segoe UI", sans-serif;
}
h1, h2, h3 { margin: 0 0 .5rem; line-height: 1.2; }
h1 { font-size: 1.25rem; }
h2 { font-size: 1.1rem; }
h3 { font-size: .95rem; color: var(--muted); font-weight: 600; margin-top: 1rem; }
.muted { color: var(--muted); }
.center { text-align: center; }
.small { font-size: .85rem; }

header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: .75rem 1rem;
  display: flex; flex-wrap: wrap; align-items: center; gap: .75rem;
}
header .spacer { flex: 1; }
main { max-width: 960px; margin: 0 auto; padding: 1rem; }

.tabs { display: flex; flex-wrap: wrap; gap: .25rem; }
.tabs button {
  background: transparent; border: 1px solid transparent; color: var(--muted);
  padding: .35rem .75rem; border-radius: 999px; cursor: pointer; font: inherit;
}
.tabs button:hover { color: var(--text); }
.tabs button[aria-selected="true"] { background: var(--accent); color: var(--accent-text); }
.subtabs { border-bottom: 1px solid var(--border); margin-bottom: 1rem; gap: 0; }
.subtabs button { border-radius: 0; border-bottom: 2px solid transparent; }
.subtabs button[aria-selected="true"] { background: transparent; color: var(--text); border-bottom-color: var(--accent); }

.tabs .demo-tab { border: 1px dashed var(--border); margin-left: .5rem; }
.demo-banner {
  border: 1px dashed var(--border); border-radius: var(--radius);
  padding: .6rem .8rem; margin-bottom: 1rem; font-size: .9rem; color: var(--muted);
}
.demo-banner p { margin: 0 0 .5rem; }
.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; margin-bottom: 1rem;
}
.auth { max-width: 360px; margin: 10vh auto; }

form.grid { display: grid; gap: .5rem; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); align-items: end; }
form.grid .wide { grid-column: span 2; }
form.stack { display: grid; gap: .6rem; }
label { display: grid; gap: .2rem; font-size: .8rem; color: var(--muted); }
input, select, textarea {
  font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 6px; padding: .4rem .5rem; width: 100%;
}
a.button-link { text-decoration: none; border: 1px solid var(--border); color: var(--text); border-radius: 6px; padding: .4rem .8rem; }
button.primary, button.secondary, button.link {
  font: inherit; cursor: pointer; border-radius: 6px; padding: .4rem .8rem;
}
button.primary { background: var(--accent); color: var(--accent-text); border: 1px solid var(--accent); }
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--border); }
button.link { background: none; border: none; color: var(--accent); padding: .1rem .3rem; font-size: .85rem; }
button.link.danger { color: var(--danger); }
button:disabled { opacity: .6; cursor: default; }

.error { color: var(--danger); min-height: 1.2em; font-size: .85rem; margin: .25rem 0 0; }

.day { margin-bottom: .75rem; }
.day-title { font-weight: 600; font-size: .85rem; color: var(--muted); margin-bottom: .25rem; }
.entry {
  display: flex; flex-wrap: wrap; gap: .25rem .75rem; align-items: baseline;
  padding: .45rem .6rem; border: 1px solid var(--border); border-radius: 6px; margin-bottom: .3rem;
  background: var(--surface);
}
.entry .name { font-weight: 600; }
.entry .notes { color: var(--muted); font-size: .85rem; flex-basis: 100%; }
.entry .actions { margin-left: auto; }
.badge { font-size: .72rem; padding: .05rem .45rem; border-radius: 999px; border: 1px solid currentColor; }
.badge.ok { color: var(--ok); }
.badge.warn { color: var(--warn); }
.badge.plan { color: var(--plan); }

.stats { display: flex; flex-wrap: wrap; gap: 1.5rem; margin: .5rem 0 1rem; }
.stat .value { font-size: 1.3rem; font-weight: 700; }
.stat .label { font-size: .75rem; color: var(--muted); }

.chart { width: 100%; height: auto; display: block; }
.chart .axis { stroke: var(--border); }
.chart text { fill: var(--muted); font-size: 11px; }
.chart .actual { stroke: var(--chart-done); fill: none; stroke-width: 2; }
.chart .actual-dot { fill: var(--chart-done); }
.chart .planned { stroke: var(--chart-goal); fill: none; stroke-width: 2; stroke-dasharray: 5 4; }
.chart .planned-dot { fill: var(--chart-goal); }
.legend { display: flex; gap: 1rem; font-size: .8rem; color: var(--muted); }
.legend .sw { display: inline-block; width: 14px; height: 3px; vertical-align: middle; margin-right: .3rem; }

table { width: 100%; border-collapse: collapse; font-size: .9rem; }
th, td { text-align: left; padding: .35rem .5rem; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; font-size: .8rem; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.invite-box { display: flex; gap: .5rem; margin-top: .5rem; }
.invite-box input { font-family: ui-monospace, monospace; font-size: .8rem; }

.defs dt { font-weight: 600; margin-top: .4rem; }
.defs dd { margin: .1rem 0 0; }
.notice { border-left: 3px solid var(--ok); padding: .4rem .7rem; background: var(--surface); }
.split-options { display: grid; gap: .5rem; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
.split-option { display: flex; gap: .5rem; align-items: flex-start; padding: .6rem; border: 1px solid var(--border); border-radius: 6px; cursor: pointer; color: var(--text); font-size: .9rem; }
.split-option.selected { border-color: var(--accent); }
.split-option input { width: auto; margin-top: .2rem; }
.split-option .badge { margin-left: .4rem; }
.session-head { display: flex; gap: .5rem; flex-wrap: wrap; margin-bottom: .5rem; }
.session-head .grow { flex: 1; min-width: 160px; }
.ex-row { display: grid; grid-template-columns: minmax(140px, 1fr) 64px 64px 76px 76px 28px; gap: .35rem; align-items: start; margin-bottom: .35rem; }
.ex-row > span { display: grid; gap: .1rem; }
.ex-head { margin-bottom: .2rem; }
.tiny { font-size: .72rem; }
.chips { display: flex; flex-wrap: wrap; gap: .3rem; margin-top: .4rem; }
.chip { font: inherit; font-size: .78rem; padding: .2rem .55rem; border-radius: 999px; border: 1px solid var(--border); background: var(--bg); color: var(--text); cursor: pointer; }
.chip:hover { border-color: var(--accent); }
.chip-row { display: flex; flex-wrap: wrap; gap: .3rem; align-items: center; width: 100%; }
.chip-label { min-width: 11rem; }
.picker select, .picker input { width: 100%; }
.add-ex summary { color: var(--accent); cursor: pointer; }
.cycle-head { display: flex; justify-content: space-between; gap: .5rem; align-items: flex-start; }
.cycle-sessions { display: grid; gap: .5rem; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.cycle-session ul { margin: .2rem 0 0; padding-left: 1.1rem; }

.invite-form { display: flex; gap: .5rem; flex-wrap: wrap; margin: .5rem 0; }
.invite-form input { flex: 1; min-width: 200px; }
label.check { display: flex; gap: .5rem; align-items: center; font-size: .9rem; color: var(--text); margin: .75rem 0 0; }
label.check input { width: auto; }
.user-extra { flex-basis: 100%; }
.user-extra:empty { display: none; }

@media (max-width: 560px) {
  .ex-row { grid-template-columns: 1fr 1fr 1fr 1fr 28px; }
  .ex-row > span:first-child { grid-column: 1 / -1; }
  .ex-head { display: none; }
  form.grid .wide { grid-column: 1 / -1; }
  .entry .actions { margin-left: 0; }
}