/* Mock exam site — off-white, monospace, 1-bit dither. No gradients. */
:root {
  --paper: #F4F1EA;
  --ink: #111111;
  --muted: #7a776f;
  --rule: #111111;
  --accent: #B3261E;
  --ok: #3F6B3A;
  --panel: #ECE8DE;
  /* 1-bit Bayer-style tiles (ink on transparent) */
  --d12: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='4' height='4' shape-rendering='crispEdges'%3E%3Crect width='1' height='1' fill='%23111'/%3E%3Crect x='2' y='2' width='1' height='1' fill='%23111'/%3E%3C/svg%3E");
  --d25: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='2' height='2' shape-rendering='crispEdges'%3E%3Crect width='1' height='1' fill='%23111'/%3E%3C/svg%3E");
  --d50: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='2' height='2' shape-rendering='crispEdges'%3E%3Crect width='1' height='1' fill='%23111'/%3E%3Crect x='1' y='1' width='1' height='1' fill='%23111'/%3E%3C/svg%3E");
  --d75: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='2' height='2' shape-rendering='crispEdges'%3E%3Crect width='2' height='2' fill='%23111'/%3E%3Crect x='1' y='1' width='1' height='1' fill='%23F4F1EA'/%3E%3C/svg%3E");
  --dred: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='2' height='2' shape-rendering='crispEdges'%3E%3Crect width='1' height='1' fill='%23B3261E'/%3E%3Crect x='1' y='1' width='1' height='1' fill='%23B3261E'/%3E%3C/svg%3E");
}

* { box-sizing: border-box; }
html { background: var(--paper); }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "IBM Plex Mono", ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap { max-width: 760px; margin: 0 auto; padding: 32px 16px 64px; }

a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
a:hover { background: var(--accent); color: var(--paper); text-decoration: none; }

/* ---------- masthead ---------- */
.dither-band { display: flex; height: 14px; margin-bottom: 28px; image-rendering: pixelated; }
.dither-band span { flex: 1; background-size: 4px 4px; }
.dither-band span:nth-child(1) { background-image: var(--d12); }
.dither-band span:nth-child(2) { background-image: var(--d25); background-size: 3px 3px; }
.dither-band span:nth-child(3) { background-image: var(--d50); background-size: 2px 2px; }
.dither-band span:nth-child(4) { background-image: var(--d75); background-size: 2px 2px; }
.dither-band span:nth-child(5) { background: var(--ink); }

h1 { font-size: 30px; line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 6px; font-weight: 700; }
.tagline { color: var(--muted); font-size: 11px; margin: 0 0 36px; letter-spacing: 0.02em; }
.crumbs { font-size: 12px; margin-bottom: 18px; color: var(--muted); }
.crumbs a { color: var(--muted); }

.label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.14em;
  color: var(--muted); margin: 40px 0 10px; font-weight: 600;
}
h2 { font-size: 19px; margin: 0 0 6px; line-height: 1.3; }
h3 { font-size: 15px; margin: 0 0 4px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: 12px; }

hr.dither { border: 0; height: 6px; background-image: var(--d25); background-size: 3px 3px; margin: 36px 0; image-rendering: pixelated; }

/* ---------- lists ---------- */
ul.index { list-style: none; padding: 0; margin: 0; border-top: 1px solid var(--rule); }
ul.index li { border-bottom: 1px solid var(--rule); padding: 14px 0; display: flex; gap: 16px; justify-content: space-between; align-items: baseline; flex-wrap: wrap; }
ul.index .meta { font-size: 12px; color: var(--muted); }
.sets a { margin-left: 10px; font-weight: 600; }
.sets a:first-child { margin-left: 0; }
.empty { border: 1px dashed var(--muted); padding: 16px; color: var(--muted); font-size: 13px; }

/* ---------- exam ---------- */
.focus { border-left: 4px solid var(--accent); padding: 4px 0 4px 12px; margin: 0 0 20px; font-size: 13px; }
.section { margin-top: 44px; }
.section-head { display: flex; justify-content: space-between; align-items: baseline; border-bottom: 2px solid var(--ink); padding-bottom: 6px; margin-bottom: 18px; gap: 12px; flex-wrap: wrap; }
.q { padding: 16px 0 20px; border-bottom: 1px solid #cfcabd; }
.q:last-child { border-bottom: 0; }
.q-num { font-weight: 700; margin-right: 6px; }
.q-prompt { font-weight: 600; margin-bottom: 10px; }
.opt { display: flex; gap: 10px; align-items: flex-start; padding: 6px 8px; margin: 2px 0; cursor: pointer; border: 1px solid transparent; }
.opt:hover { border-color: var(--ink); }
.opt input { margin-top: 5px; accent-color: var(--ink); }
.opt.correct { border-color: var(--ok); color: var(--ok); font-weight: 600; }
.opt.wrong { border-color: var(--accent); color: var(--accent); text-decoration: line-through; }
textarea {
  width: 100%; min-height: 90px; font: inherit; font-size: 14px; color: var(--ink);
  background: #FBFAF6; border: 1px solid var(--ink); border-radius: 0; padding: 10px; resize: vertical;
}
textarea.open { min-height: 170px; }
textarea:disabled { background: var(--panel); }

.reveal { background: var(--panel); padding: 12px 14px; margin-top: 12px; font-size: 13px; }
.reveal ul { margin: 6px 0 0; padding-left: 18px; }
.mark { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

button {
  font: inherit; font-size: 13px; font-weight: 600; letter-spacing: 0.04em;
  background: var(--paper); color: var(--ink); border: 2px solid var(--ink); border-radius: 0;
  padding: 8px 16px; cursor: pointer;
}
button:hover:not(:disabled) { background: var(--ink); color: var(--paper); }
button:disabled { opacity: 0.4; cursor: not-allowed; }
button.primary { background: var(--ink); color: var(--paper); }
button.primary:hover:not(:disabled) { background: var(--accent); border-color: var(--accent); }
.mark button.on[data-v="1"] { background: var(--ok); border-color: var(--ok); color: var(--paper); }
.mark button.on[data-v="0.5"] { background: var(--ink); color: var(--paper); }
.mark button.on[data-v="0"] { background: var(--accent); border-color: var(--accent); color: var(--paper); }
.actions { margin-top: 20px; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }

/* ---------- results ---------- */
.results { margin-top: 56px; border: 2px solid var(--ink); padding: 20px 18px; }
.grade { display: flex; align-items: baseline; gap: 18px; flex-wrap: wrap; }
.grade .letter { font-size: 64px; font-weight: 700; line-height: 1; color: var(--accent); }
.grade .pct { font-size: 22px; font-weight: 700; }
.bar { height: 12px; border: 1px solid var(--ink); margin: 6px 0 14px; image-rendering: pixelated; }
.bar > div { height: 100%; background-image: var(--d50); background-size: 2px 2px; }
.bar.low > div { background-image: var(--dred); }
.sec-score { display: flex; justify-content: space-between; font-size: 13px; }
.miss { border-top: 1px solid #cfcabd; padding: 14px 0; font-size: 13px; }
.miss .tag { font-size: 11px; text-transform: uppercase; letter-spacing: 0.12em; font-weight: 700; color: var(--accent); }
.miss .tag.partial { color: var(--ink); }
.miss blockquote { margin: 8px 0 0; padding: 6px 0 6px 12px; border-left: 3px solid var(--ink); font-style: italic; }
.miss .src { font-style: normal; font-size: 12px; color: var(--muted); display: block; margin-top: 4px; }
.history { font-size: 12px; color: var(--muted); margin-top: 6px; }

footer { margin-top: 64px; font-size: 11px; color: var(--muted); }

@media (max-width: 520px) {
  h1 { font-size: 24px; }
  .grade .letter { font-size: 48px; }
  ul.index li { flex-direction: column; gap: 4px; }
}