/* Shared styles for the student + instructor apps. Mobile-first (students are on
   phones). Deliberately small and dependency-free. */
:root {
  color-scheme: light dark;
  --blue: #2563eb;
  --green: #16a34a;
  --red: #dc2626;
  --amber: #d97706;
  --border: rgba(128, 128, 128, 0.35);
}
* { box-sizing: border-box; }
body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  max-width: 560px; margin: 0 auto; padding: 20px; line-height: 1.5;
}
h1 { font-size: 1.4rem; }
h2 { font-size: 1.1rem; }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 16px; margin: 14px 0; }
.hidden { display: none !important; }
label { display: block; font-size: 0.85rem; opacity: 0.8; margin: 10px 0 4px; }
input {
  width: 100%; font-size: 1rem; padding: 10px 12px; border-radius: 8px;
  border: 1px solid var(--border); background: transparent; color: inherit;
}
button {
  font-size: 1rem; padding: 11px 16px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--blue); color: #fff; cursor: pointer; margin: 8px 6px 0 0;
}
button.secondary { background: transparent; color: inherit; }
button.danger { background: var(--red); }
button.active { background: var(--red); }
button:disabled { opacity: 0.5; cursor: not-allowed; }
.big { font-size: 2rem; font-weight: 700; letter-spacing: 4px; text-align: center; margin: 10px 0; }
.muted { opacity: 0.7; font-size: 0.88rem; }
.ok { color: var(--green); } .bad { color: var(--red); } .warn { color: var(--amber); }
.pill { display: inline-block; font-size: 0.72rem; padding: 2px 8px; border-radius: 999px; border: 1px solid var(--border); }
.pill.fraud { color: var(--red); border-color: var(--red); }
.pill.manual { color: var(--amber); border-color: var(--amber); }
.row { display: flex; align-items: center; justify-content: space-between; gap: 8px; padding: 8px 0; border-bottom: 1px dashed var(--border); }
.row:last-child { border-bottom: none; }
.grid { display: flex; flex-wrap: wrap; gap: 8px; }
.grid .name { border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; font-size: 0.9rem; }
.grid .name.fraud { border-color: var(--red); color: var(--red); }
#toast { position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); background: #111; color: #fff;
  padding: 10px 16px; border-radius: 8px; font-size: 0.9rem; opacity: 0; transition: opacity 0.2s; pointer-events: none; max-width: 90%; }
#toast.show { opacity: 0.95; }