:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --ink: #1f2430;
  --muted: #6b7280;
  --line: #e3e6ea;
  --primary: #b21f2d;
  --primary-ink: #ffffff;
  --ok: #1d7a46;
  --err: #b21f2d;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
}

.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 0.9rem; }
.spacer { flex: 1; }
.row { display: flex; gap: 0.5rem; align-items: center; }

.view { min-height: 100vh; }

.topbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.25rem;
  background: var(--card);
  border-bottom: 1px solid var(--line);
}

/* Primary navigation between Home / Question Bank / Manage Accounts. */
.mainnav {
  display: flex;
  gap: 0.25rem;
  padding: 0 1.25rem;
  background: var(--card);
  border-bottom: 1px solid var(--line);
  overflow-x: auto;
}
.navbtn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  border-radius: 0;
  margin: 0;
  padding: 0.7rem 0.9rem;
  color: var(--muted);
  font-weight: 500;
  white-space: nowrap;
}
.navbtn.active { color: var(--ink); border-bottom-color: var(--primary); }

main {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.25rem;
}

.page { display: grid; gap: 1.25rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem;
}

.login-card {
  max-width: 360px;
  margin: 8vh auto;
  display: flex;
  flex-direction: column;
}

h1 { font-size: 1.4rem; margin: 0 0 0.25rem; }
h2 { font-size: 1.15rem; margin: 0 0 0.25rem; }
h3 { font-size: 1rem; margin: 1rem 0 0.25rem; }

label { display: block; font-size: 0.85rem; margin: 0.6rem 0 0.2rem; font-weight: 500; }

input, select, textarea {
  width: 100%;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  background: #fff;
  color: inherit;
}

button {
  cursor: pointer;
  border-radius: 8px;
  border: 1px solid transparent;
  padding: 0.5rem 0.9rem;
  font: inherit;
  margin-top: 0.6rem;
}

button.primary { background: var(--primary); color: var(--primary-ink); }
button.ghost { background: transparent; border-color: var(--line); color: var(--ink); }
button:disabled { opacity: 0.5; cursor: default; }

table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; }
th, td { text-align: left; padding: 0.4rem 0.5rem; border-bottom: 1px solid var(--line); font-size: 0.9rem; }
td input { padding: 0.3rem 0.4rem; }
td input[type="number"] { width: 6rem; }

.subform { border-top: 1px solid var(--line); margin-top: 0.75rem; padding-top: 0.75rem; }

.questions { list-style: none; padding: 0; margin: 0.75rem 0 0; }
.questions li {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.6rem 0.75rem;
  margin-bottom: 0.5rem;
}
.questions .correct { color: var(--ok); font-weight: 500; }

.option-row { display: flex; gap: 0.5rem; align-items: center; margin-bottom: 0.35rem; }
.option-row input[type="text"] { flex: 1; }
.option-row input[type="radio"] { width: auto; }

.msg { margin-left: 0.6rem; font-size: 0.9rem; }
.error { color: var(--err); font-size: 0.9rem; }
.problems { color: var(--err); font-size: 0.9rem; }

/* Status pills and compact row actions (learners / staff tables). */
.pill {
  display: inline-block;
  font-size: 0.75rem;
  padding: 0.1rem 0.55rem;
  border-radius: 999px;
  font-weight: 500;
  text-transform: capitalize;
}
.pill.pass { background: #e7f4ec; color: var(--ok); }
.pill.fail { background: #fbeaec; color: var(--err); }
.pill.warn { background: #fdf3e3; color: #9a6700; }

button.mini { padding: 0.25rem 0.5rem; font-size: 0.8rem; margin: 0.1rem 0.15rem 0.1rem 0; }
td.actions { white-space: nowrap; }

/* Home user guide. */
.guide p { font-size: 0.95rem; }
.guide h3 { margin-top: 1.2rem; }
.guide ul { margin: 0.3rem 0 0.5rem 1.1rem; padding: 0; }
.guide li { margin: 0.25rem 0; font-size: 0.95rem; }
.guide em { font-style: normal; font-weight: 500; color: var(--ink); }

/* Narrow screens: the top bar keeps the title and its buttons; the "signed in as"
   label is dropped and the buttons wrap below the title if needed. */
@media (max-width: 520px) {
  .topbar { flex-wrap: wrap; row-gap: 0.4rem; }
  .topbar #who { display: none; }
  .topbar button { padding: 0.35rem 0.6rem; }
}