/* CS 5800 recitation visualizations — shared styles */

:root {
  --paper: #E7E1CE;
  --paper-deep: #DCD4BA;
  --ink: #21281F;
  --ink-soft: #52584C;
  --moss: #3E6B4A;
  --moss-deep: #2C4F36;
  --moss-soft: #DCE7DD;
  --rust: #A8571E;
  --rust-deep: #7E3F13;
  --rust-soft: #F1DFCC;
  --line: #B7AD8E;
  --alert: #8E2B1F;
  --neutral-line: #8A8365;
  --unknown: #A9A288;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: 'IBM Plex Sans', sans-serif;
}

.wrap { max-width: 1180px; margin: 0 auto; padding: 32px 28px 64px; }
.wrap-narrow { max-width: 780px; }

/* ---- site chrome ---- */

.sitebar {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding-bottom: 12px;
  margin-bottom: 26px;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}

.sitebar a { color: var(--ink-soft); text-decoration: none; font-size: 0.85rem; }
.sitebar a:hover { color: var(--ink); text-decoration: underline; }

.course-mark {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.82rem;
  color: var(--ink-soft);
  letter-spacing: 0.02em;
}

h1 {
  font-family: 'Fraunces', serif;
  font-weight: 600;
  font-optical-sizing: auto;
  font-size: 2.2rem;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
  line-height: 1.15;
}

h2 {
  font-family: 'Fraunces', serif;
  font-weight: 500;
  font-size: 1.25rem;
  margin: 0 0 12px;
}

.subtitle {
  font-size: 1rem;
  color: var(--ink-soft);
  max-width: 680px;
  line-height: 1.55;
  margin: 0;
}

.panel {
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-radius: 3px;
  padding: 18px;
}

.divider { border-top: 1px solid var(--line); margin: 16px 0; }

.section-label { font-size: 0.75rem; color: var(--ink-soft); margin: 0 0 8px; }

.hint { font-size: 0.85rem; color: var(--ink-soft); line-height: 1.6; margin: 0; }
.hint + .hint { margin-top: 8px; }

button {
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
  padding: 8px 14px;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}
button:hover:not(:disabled) { background: var(--ink); color: var(--paper); }
button:disabled { opacity: 0.45; cursor: not-allowed; }
button:focus-visible, a:focus-visible { outline: 2px solid var(--moss-deep); outline-offset: 2px; }
button.active { background: var(--moss); color: var(--paper); border-color: var(--moss); }

/* ---- topic tags ---- */

.tag {
  display: inline-block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--ink-soft);
  background: var(--paper);
  white-space: nowrap;
}

/* ---- index listing ---- */

.filter-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 4px;
}

.filter-chip {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  padding: 5px 11px;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink-soft);
  border-radius: 2px;
  cursor: pointer;
}
.filter-chip:hover { background: var(--paper-deep); color: var(--ink); }
.filter-chip.on { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.problem-list { margin-top: 26px; border-top: 1px solid var(--line); }

.problem-row {
  display: grid;
  grid-template-columns: 74px 1fr auto;
  gap: 18px;
  align-items: baseline;
  padding: 20px 4px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}
.problem-row:hover { background: var(--paper-deep); }

.week-no {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--ink-soft);
  padding-top: 3px;
}

.problem-title {
  font-family: 'Fraunces', serif;
  font-size: 1.16rem;
  font-weight: 500;
  margin: 0 0 5px;
}

.problem-blurb {
  font-size: 0.89rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin: 0 0 9px;
  max-width: 62ch;
}

.row-tags { display: flex; gap: 6px; flex-wrap: wrap; }

.row-cue { font-size: 0.82rem; color: var(--ink-soft); white-space: nowrap; padding-top: 4px; }
.problem-row:hover .row-cue { color: var(--ink); }

.empty-note { padding: 28px 4px; color: var(--ink-soft); font-size: 0.9rem; }

@media (max-width: 620px) {
  .problem-row { grid-template-columns: 56px 1fr; }
  .row-cue { display: none; }
}

/* ---- problem page: statement + questions ---- */

.statement {
  background: var(--paper-deep);
  border: 1px solid var(--line);
  border-left: 3px solid var(--neutral-line);
  border-radius: 3px;
  padding: 18px 20px;
  margin-bottom: 26px;
}
.statement p { margin: 0 0 12px; line-height: 1.65; font-size: 0.95rem; }
.statement p:last-child { margin-bottom: 0; }

.questions { margin-top: 30px; }
.questions ol { margin: 0; padding-left: 22px; }
.questions li { margin-bottom: 11px; line-height: 1.6; font-size: 0.93rem; }
.questions li:last-child { margin-bottom: 0; }

.meta-strip {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  margin: 12px 0 22px;
}