:root {
  --bg: #1c1f1a;
  --fg: #eef1e8;
  --muted: #a9ad9f;
  --accent: #e8c468;
  --danger: #e2725b;
  --border: #eef1e8;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: 'Courier New', monospace;
  min-height: 100vh;
}
.page { display: flex; flex-direction: column; min-height: 100vh; }
.topbar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1rem;
  border-bottom: 2px dashed var(--border);
}
.topbar a { color: var(--fg); text-decoration: none; padding: 0.4rem 0.2rem; }
.topbar .brand { font-weight: bold; margin-right: auto; letter-spacing: 0.05em; }
.content { flex: 1; display: flex; align-items: flex-start; justify-content: center; padding: 1.25rem; }
.chalk {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 1.5rem 1.25rem;
  width: 100%;
  max-width: 480px;
  background: rgba(255, 255, 255, 0.02);
}
.chalk.center { text-align: center; }
h1 { font-size: 1.4rem; letter-spacing: 0.03em; margin-top: 0; }
h2 { font-size: 1.1rem; border-bottom: 1px dashed var(--border); padding-bottom: 0.4rem; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.error { color: var(--danger); font-weight: bold; }
.notice { color: var(--accent); font-weight: bold; }

form { display: flex; flex-direction: column; gap: 0.9rem; margin-top: 1rem; }
label { display: flex; flex-direction: column; gap: 0.35rem; font-size: 0.95rem; text-align: left; }
input[type="text"], input[type="password"] {
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  color: var(--fg);
  font-family: inherit;
  font-size: 1.1rem;
  padding: 0.9rem 0.8rem;
  min-height: 3rem;
}
input:focus { outline: 2px solid var(--accent); }
button, .btn {
  background: var(--accent);
  color: #1c1f1a;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-weight: bold;
  font-size: 1.05rem;
  padding: 0.9rem 1rem;
  min-height: 3rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}
button.small { min-height: 2.4rem; padding: 0.5rem 0.9rem; font-size: 0.9rem; }
.btn-danger { background: var(--danger); color: var(--fg); }

.user-grid { display: flex; flex-direction: column; gap: 1rem; margin-top: 1.5rem; }
.user-card {
  border: 2px dashed var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  font-size: 1.3rem;
  font-weight: bold;
  color: var(--fg);
  text-decoration: none;
  min-height: 4rem;
  display: flex;
  align-items: center;
  justify-content: center;
}
.user-card:active { background: rgba(232, 196, 104, 0.15); }

.card { border-top: 1px dashed var(--border); padding-top: 1rem; margin-top: 1.5rem; }
.card:first-of-type { border-top: none; margin-top: 0.5rem; padding-top: 0; }

.checkbox { flex-direction: row; align-items: center; gap: 0.6rem; font-size: 1rem; }
.checkbox input { width: 1.3rem; height: 1.3rem; }

.qr { display: block; margin: 1rem auto; width: 220px; height: 220px; background: #fff; padding: 8px; border-radius: 8px; }

.session-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px dashed rgba(238, 241, 232, 0.3);
}
.session-row:last-child { border-bottom: none; }
.session-row.current strong { color: var(--accent); }

@media (min-width: 600px) {
  .user-grid { flex-direction: row; }
  .user-card { flex: 1; }
}