:root {
  --bg: #eef2ee;
  --card: #f8faf7;
  --text: #26302a;
  --muted: #5f6f65;
  --line: #d5ded6;
  --accent: #4a6b3a;
  --accent-text: #ffffff;
  --ok: #2f6b3a;
  --err: #b42318;
  --radius: 14px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141a16;
    --card: #1c241f;
    --text: #e6ece7;
    --muted: #9aab9f;
    --line: #2c3830;
    --accent: #8fb77a;
    --accent-text: #141a16;
    --ok: #7cc48a;
    --err: #f87171;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, 'Segoe UI', sans-serif;
}
a { color: var(--accent); }
main { max-width: 640px; margin: 0 auto; padding: 24px 16px 64px; }
h1 { font-size: 1.8rem; margin: 0 0 4px; }
h2 { font-size: 1.15rem; margin: 32px 0 12px; }
p.lead { color: var(--muted); margin: 0 0 8px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.session-head { display: flex; justify-content: space-between; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.when { font-weight: 600; font-size: 1.05rem; }
.meta { color: var(--muted); font-size: 0.9rem; }
.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--accent);
  color: var(--accent-text);
  margin-left: 6px;
  vertical-align: middle;
}
.badge.full { background: var(--muted); }
form { display: grid; gap: 10px; margin-top: 12px; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
@media (max-width: 480px) { .row { grid-template-columns: 1fr; } }
label { display: grid; gap: 4px; font-size: 0.9rem; color: var(--muted); }
label.check { display: flex; gap: 8px; align-items: flex-start; color: var(--text); }
input, textarea, select {
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px 12px;
  width: 100%;
}
label.check input { width: auto; margin-top: 4px; }
button {
  font: inherit;
  font-weight: 600;
  border: 0;
  border-radius: 10px;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
}
button.secondary { background: transparent; color: var(--text); border: 1px solid var(--line); }
button.link { background: none; color: var(--accent); padding: 0; font-weight: 500; }
button:disabled { opacity: 0.5; cursor: default; }
button.big { width: 100%; padding: 18px; font-size: 1.2rem; border-radius: var(--radius); }
.msg { font-size: 0.9rem; min-height: 1.2em; margin: 0; }
.msg.ok { color: var(--ok); }
.msg.err { color: var(--err); }
.empty { color: var(--muted); text-align: center; padding: 24px; }
ul.people { margin: 8px 0 0; padding-left: 18px; }
ul.people li { margin: 2px 0; }
.topbar { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.hidden { display: none !important; }