:root {
  color-scheme: light;
  --ink: #1d2733;
  --muted: #5a6776;
  --line: #d6dde5;
  --accent: #0b5cad;
  --warn-bg: #fff4e0;
  --warn-ink: #7a4b00;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--ink);
  background: #f5f7fa;
}

body { margin: 0; }
main { max-width: 960px; margin: 0 auto; padding: 1rem; }
h1 { font-size: 1.25rem; margin: 0; }
h2 { font-size: 1.15rem; }
h3 { font-size: 1rem; margin-top: 0; }

.top { display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--line); padding-bottom: .75rem; }
.top nav { display: flex; gap: .75rem; }
.top nav a[aria-current="page"] { font-weight: 600; text-decoration: none; }
.session { display: flex; gap: .5rem; align-items: center; color: var(--muted); font-size: .9rem; }

a { color: var(--accent); }
button, .button { font: inherit; padding: .45rem .9rem; border-radius: 6px; border: 1px solid var(--accent);
  background: var(--accent); color: #fff; cursor: pointer; text-decoration: none; display: inline-block; }
button[type="button"] { background: #fff; color: var(--accent); }

.card { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 1rem; margin: 1rem 0; }
.hint { color: var(--muted); font-size: .9rem; }
.notice { background: var(--warn-bg); color: var(--warn-ink); padding: .6rem .8rem; border-radius: 6px; }
.login { max-width: 560px; margin: 3rem auto; }

dl { display: grid; grid-template-columns: max-content 1fr; gap: .3rem 1rem; margin: 0; }
dt { color: var(--muted); }
dd { margin: 0; }

form { display: flex; flex-wrap: wrap; gap: .5rem; align-items: end; }
form label { display: block; width: 100%; font-size: .9rem; color: var(--muted); }
input { font: inherit; padding: .4rem .5rem; border: 1px solid var(--line); border-radius: 6px; }

.channels { list-style: none; padding: 0; }
.actions { display: flex; gap: .5rem; }
.qr canvas { margin-top: .75rem; width: 240px; height: 240px; image-rendering: pixelated; }
.results { padding-left: 1.2rem; }