/* =====================================================================
   Shared exam stylesheet · TSD Standards Testing-Out Exams
   Design intent: a paper-like, classroom-distributable exam page.
   Print-ready (one problem per page when long), screen-readable, generous
   whitespace.  No frameworks; depends only on system fonts and MathJax 3
   (loaded per-page via CDN).
   ===================================================================== */

:root {
  --paper:        #fdfdfb;
  --paper-edge:   #e8e4d9;
  --ink:          #1a1a1a;
  --ink-soft:     #3a3a3a;
  --ink-muted:    #6b6b6b;
  --rule:         #d8d4c5;
  --rule-strong:  #b8b3a0;
  --accent:       #6b21a8;        /* math purple, matches the matrix */
  --accent-soft:  #f1e8f8;
  --warn:         #b45309;
  --warn-soft:    #fff8e6;
  --good:         #15803d;
  --good-soft:    #e6f4ea;
  --code-bg:      #f3f1e8;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper-edge);
  font-family: "Charter", "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;
  font-size: 17px;
  line-height: 1.6;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

/* The "page" — a sheet of paper centered on the screen background. */
.exam-sheet {
  max-width: 880px;
  margin: 32px auto 80px;
  background: var(--paper);
  border: 1px solid var(--rule);
  box-shadow: 0 2px 4px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.06);
  padding: 56px 64px 80px;
}

/* ===================== Header ===================== */
.exam-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 14px;
  margin-bottom: 8px;
}

.exam-banner .course {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-size: 13px;
  color: var(--accent);
}
.exam-banner .meta {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

h1.exam-title {
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, "Times New Roman", serif;
  font-size: 32px;
  line-height: 1.2;
  letter-spacing: -0.005em;
  margin: 14px 0 6px;
  color: var(--ink);
}
.exam-subtitle {
  font-style: italic;
  color: var(--ink-soft);
  margin: 0 0 24px;
  font-size: 16px;
}

/* Identity strip: name / proctor / score */
.exam-id-strip {
  display: grid;
  grid-template-columns: 1.5fr 1fr 0.6fr;
  gap: 18px;
  margin: 18px 0 28px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 13px;
  color: var(--ink-muted);
}
.exam-id-strip .field {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.exam-id-strip .field .label {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 11px;
}
.exam-id-strip .field .blank {
  border-bottom: 1px solid var(--ink);
  height: 22px;
}

/* Instructions card */
.instructions {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: 14px 18px;
  margin: 0 0 28px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 14px;
  line-height: 1.55;
  color: var(--ink-soft);
  border-radius: 0 4px 4px 0;
}
.instructions h3 {
  margin: 0 0 6px;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
}
.instructions ul { margin: 6px 0 0 20px; padding: 0; }
.instructions li { margin-bottom: 4px; }

/* Section divider — used for "Part I: No Calculator" */
.exam-section-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 36px 0 18px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
}
.exam-section-divider::before,
.exam-section-divider::after {
  content: "";
  flex: 1;
  border-top: 1px solid var(--rule-strong);
}

/* ===================== Problems ===================== */
.problem {
  margin: 0 0 44px;
  padding-top: 6px;
  page-break-inside: avoid;
}
.problem .problem-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}
.problem .problem-head .num {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-weight: 700;
  font-size: 18px;
  color: var(--accent);
  min-width: 38px;
}
.problem .problem-head .title {
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  letter-spacing: 0.01em;
}
.problem .problem-head .points {
  margin-left: auto;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 12px;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.problem .stem { margin-bottom: 14px; }
.problem .stem p { margin: 0 0 10px; }

/* Multi-part subproblems */
ol.parts {
  margin: 8px 0 0 0;
  padding: 0;
  list-style: none;
  counter-reset: part;
}
ol.parts > li {
  position: relative;
  padding: 6px 0 18px 38px;
  margin: 0;
  counter-increment: part;
}
ol.parts > li::before {
  content: "(" counter(part, lower-alpha) ")";
  position: absolute;
  left: 0;
  top: 6px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
  color: var(--ink-soft);
  font-size: 15px;
  width: 30px;
}
ol.parts ol.parts > li::before { content: "(" counter(part, lower-roman) ")"; }

/* Answer affordances */
.answer-blank {
  display: inline-block;
  border-bottom: 1px solid var(--ink);
  min-width: 120px;
  height: 1.2em;
  margin: 0 4px;
  vertical-align: bottom;
}
.work-space {
  border: 1px dashed var(--rule-strong);
  background: #fdfcf6;
  margin: 12px 0 0;
  min-height: 110px;
  border-radius: 3px;
}
.work-space.tall { min-height: 200px; }
.work-space.short { min-height: 70px; }
.work-space::before {
  content: "Work space";
  display: block;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-muted);
  padding: 4px 8px 0;
}

/* Inline data tables inside problems */
table.data {
  border-collapse: collapse;
  margin: 12px 0;
  font-family: "Iowan Old Style", "Palatino Linotype", Georgia, serif;
  font-variant-numeric: tabular-nums;
}
table.data th, table.data td {
  border: 1px solid var(--rule-strong);
  padding: 6px 12px;
  text-align: center;
}
table.data th {
  background: var(--accent-soft);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.02em;
}
table.data caption {
  caption-side: top;
  font-size: 13px;
  color: var(--ink-muted);
  margin-bottom: 4px;
  font-style: italic;
}

/* Coordinate-grid inset (for graphs) */
.grid-figure {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 14px 0;
}
.grid-figure svg { max-width: 100%; height: auto; }
.grid-figure figcaption {
  font-size: 13px;
  color: var(--ink-muted);
  font-style: italic;
  margin-top: 6px;
  text-align: center;
}

/* "Show that…" / "Justify…" callout */
.callout {
  background: var(--warn-soft);
  border-left: 3px solid var(--warn);
  padding: 10px 14px;
  margin: 10px 0;
  font-size: 14px;
  color: #6b3a09;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  border-radius: 0 4px 4px 0;
}
.callout strong { color: var(--warn); }

/* Picture-based items (K-2 exams) */
.pictogram {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 8px 0;
  font-size: 26px;
  line-height: 1;
}
.shape-row {
  display: flex;
  gap: 14px;
  margin: 12px 0;
  align-items: center;
}
.shape-row .shape {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  width: 56px;
  height: 56px;
  border: 1px solid var(--rule-strong);
  background: white;
  border-radius: 4px;
}

/* Footer */
.exam-footer {
  margin-top: 48px;
  padding-top: 20px;
  border-top: 1px solid var(--rule);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  font-size: 12px;
  color: var(--ink-muted);
  letter-spacing: 0.02em;
}
.exam-footer a {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
}
.exam-footer a:hover { text-decoration: underline; }

/* ===================== Matrix exam-cell styles =====================
   These hooks live on math.html (added by the column rewrite).  Putting
   them here keeps the exam-related styling co-located, but math.html
   needs to <link> this stylesheet too — handled by adding the link in
   styles.css via @import would be cleaner; for now, math.html keeps
   inline rules below. */
td.exam-cell { vertical-align: middle; text-align: center; padding: 8px 6px; }
a.exam-link {
  display: block;
  padding: 8px 6px;
  margin: 4px 0;
  text-decoration: none;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid #d8c8e8;
  border-radius: 4px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  transition: background 120ms;
}
a.exam-link:hover { background: #e2d4ee; }
a.exam-link .exam-cta {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
}
a.exam-link .exam-sub {
  display: block;
  font-size: 11px;
  color: var(--ink-muted);
  margin-top: 1px;
}

/* ===================== Print ===================== */
@media print {
  body { background: white; }
  .exam-sheet {
    box-shadow: none;
    border: none;
    margin: 0;
    padding: 0;
    max-width: none;
  }
  .work-space { break-inside: avoid; }
  .problem    { break-inside: avoid; }
  .exam-footer { display: none; }
}

/* ===================== Small screens ===================== */
@media (max-width: 700px) {
  .exam-sheet { padding: 32px 22px 60px; margin: 0; border: none; box-shadow: none; }
  h1.exam-title { font-size: 26px; }
  body { font-size: 16px; }
  .exam-id-strip { grid-template-columns: 1fr; }
}