:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #6b7280;
  --accent: #5b3fd6;
  --border: #e5e7eb;
  --card: #f9fafb;
  --good: #15803d;
  --bad: #b91c1c;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111318;
    --fg: #eef0f4;
    --muted: #9aa1ad;
    --accent: #9d8cf0;
    --border: #2a2d36;
    --card: #1a1d24;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font-family: system-ui, sans-serif; }
header { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.5rem; border-bottom: 1px solid var(--border); flex-wrap: wrap; }
h1 { font-size: 1.1rem; margin: 0; }
nav { display: flex; gap: 0.5rem; align-items: center; flex-wrap: wrap; }
select { max-width: 100%; }
button, select { font: inherit; padding: 0.4rem 0.8rem; border-radius: 6px; border: 1px solid var(--border); background: var(--card); color: var(--fg); cursor: pointer; }
button:hover, select:hover { border-color: var(--accent); }
#certSelect { font-weight: 600; }
.card ul { margin: 0.4rem 0 0; padding-left: 1.2rem; }
#whoami { color: var(--muted); font-size: 0.85rem; margin-left: 0.5rem; }
main { padding: 1.5rem; max-width: 760px; margin: 0 auto; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 10px; padding: 1.2rem; margin-bottom: 1rem; }
.option { display: block; width: 100%; text-align: left; margin: 0.3rem 0; padding: 0.6rem 0.8rem; }
.option.selected { border-color: var(--accent); }
.option.correct { border-color: var(--good); color: var(--good); }
.option.incorrect { border-color: var(--bad); color: var(--bad); }
.muted { color: var(--muted); }
table { width: 100%; border-collapse: collapse; }
.table-wrap { overflow-x: auto; margin: 0 0 0.6rem; }
.table-wrap table { font-size: 0.9rem; }
th, td { text-align: left; padding: 0.4rem 0.6rem; border-bottom: 1px solid var(--border); }
.mastery-row { display: flex; gap: 0.4rem; margin-top: 0.8rem; }
.mastery-row button.active { background: var(--accent); color: white; border-color: var(--accent); }
textarea, input[type=password], input[type=text], input[type=email] { width: 100%; font: inherit; padding: 0.5rem; border-radius: 6px; border: 1px solid var(--border); background: var(--bg); color: var(--fg); }
#loggedOut label { display: block; margin-top: 0.3rem; }
pre { background: var(--bg); border: 1px solid var(--border); border-radius: 6px; padding: 0.6rem; font-size: 0.85rem; }
.qtext p { margin: 0 0 0.6rem; }
.explanation { margin-top: 0.6rem; }
.explanation p { margin: 0 0 0.5rem; }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.9em; }
pre.code { white-space: pre; overflow-x: auto; line-height: 1.6; margin: 0 0 0.6rem; }
pre.code code { font-size: inherit; }
input.gap-input, select.gap-select { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: inherit; padding: 0.05rem 0.3rem; border-radius: 4px; border: 1px solid var(--accent); background: var(--card); color: var(--fg); width: auto; }
input.gap-input.standalone { width: 100%; padding: 0.5rem; margin-top: 0.3rem; }
.gap-row { display: block; margin-top: 0.5rem; }
input.gap-input.correct, select.gap-select.correct { border-color: var(--good); color: var(--good); }
input.gap-input.incorrect, select.gap-select.incorrect { border-color: var(--bad); color: var(--bad); text-decoration: line-through; }
.gap-fix { color: var(--good); font-weight: 600; }
.order-list { list-style: none; padding: 0; margin: 0; }
.order-list li { display: flex; align-items: center; gap: 0.4rem; margin: 0.3rem 0; padding: 0.4rem 0.6rem; border: 1px solid var(--border); border-radius: 6px; background: var(--bg); cursor: grab; }
.order-list li code { flex: 1; min-width: 0; white-space: pre-wrap; overflow-wrap: anywhere; line-height: 1.5; }
.order-list li button { padding: 0.2rem 0.6rem; }
.order-list li.correct { border-color: var(--good); }
.order-list li.incorrect { border-color: var(--bad); }
.link-button { background: none; border: none; padding: 0; margin-left: 0.8rem; color: var(--muted); text-decoration: underline; font-size: 0.85rem; }
.fb-text { white-space: pre-wrap; }
.fb-reply { border-left: 3px solid var(--border); padding-left: 0.7rem; margin: 0.6rem 0; }
.fb-reply.fb-admin { border-left-color: var(--accent); }
.fb-status { display: inline-block; padding: 0 0.45rem; border-radius: 999px; border: 1px solid var(--border); font-size: 0.8rem; text-transform: uppercase; }
.fb-status.fb-open { border-color: var(--accent); color: var(--accent); }
.fb-status.fb-resolved { opacity: 0.6; }
button.active-filter { border-color: var(--accent); background: var(--accent); color: white; }
.fb-form label { display: block; margin-top: 0.5rem; }
.mcp-banner { margin: 1rem 1.5rem 0; padding: 0.7rem 1rem; border: 1px solid var(--accent); border-radius: 10px; background: var(--card); }
@media (min-width: 760px) { .mcp-banner { margin: 1rem auto 0; max-width: calc(760px - 3rem); } }
.mcp-banner a { color: var(--accent); font-weight: 600; margin-left: 0.4rem; }
.card.mcp-required { border-color: var(--accent); }
.legal { line-height: 1.55; }
.legal h3 { margin: 1.4rem 0 0.4rem; }
.legal a, .site-footer a { color: var(--accent); }
.home-link { color: inherit; text-decoration: none; }
.site-footer { text-align: center; padding: 1rem 1.5rem 2rem; font-size: 0.85rem; color: var(--muted); }
.auth-error { margin: 0 0 0.8rem; padding: 0.6rem 0.8rem; border: 1px solid var(--bad); border-radius: 6px; color: var(--bad); }