/* School colors: change these to restyle the whole site */
:root {
  --purple: #4b2a85;
  --purple-dark: #2e1856;
  --purple-tint: #f1ebfa;
  --yellow: #f5c518;
  --yellow-tint: #fdf4cf;
  --green: #1f7a45;
  --green-tint: #e2f3e8;

  --ink: #1d1a22;
  --muted: #6b6578;
  --paper: #fdfbf6;
  --rule: #e6e1ec;

  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Purple / yellow / green stripe used on the header and footer */
  --stripe: linear-gradient(90deg,
    var(--purple) 0 33.3%, var(--yellow) 33.3% 66.6%, var(--green) 66.6% 100%);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  /* Keep the footer at the bottom on short pages */
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
main.wrap { flex: 1; width: 100%; }

a { color: var(--purple); text-underline-offset: 2px; text-decoration-color: var(--yellow); text-decoration-thickness: 2px; }

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Masthead */
.masthead {
  position: relative;
  color: #fff;
  background-color: var(--purple-dark);
  /* Faint scattered math symbols */
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='160'%3E%3Cg font-family='Georgia,serif' fill='%23ffffff' fill-opacity='0.07'%3E%3Ctext x='14' y='38' font-size='30'%3E%CF%80%3C/text%3E%3Ctext x='120' y='30' font-size='22'%3E%2B%3C/text%3E%3Ctext x='180' y='88' font-size='28' font-style='italic'%3Ex%3C/text%3E%3Ctext x='66' y='100' font-size='26'%3E%E2%88%9A%3C/text%3E%3Ctext x='150' y='146' font-size='24'%3E%E2%88%91%3C/text%3E%3Ctext x='24' y='148' font-size='22'%3E%C3%B7%3C/text%3E%3Ctext x='96' y='64' font-size='18'%3E7%3C/text%3E%3C/g%3E%3C/svg%3E");
}
.masthead::after {
  content: "";
  display: block;
  height: 5px;
  background: var(--stripe);
}
.masthead-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 8px 24px;
  flex-wrap: wrap;
  padding-top: 36px;
  padding-bottom: 24px;
}
.masthead h1 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 2.6rem;
  line-height: 1;
  letter-spacing: 0.01em;
}
.subtitle {
  margin: 8px 0 0;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.15rem;
  color: #d8cdee;
}
.contest-date {
  margin: 0;
  padding: 4px 12px;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--purple-dark);
  background: var(--yellow);
  border-radius: 999px;
  transform: rotate(-2deg);
}

/* Tabs */
.tabs {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}
.tabs-inner {
  display: flex;
  gap: 20px;
  overflow-x: auto;
  scrollbar-width: none;
}
.tabs-inner::-webkit-scrollbar { display: none; }
.tab {
  flex-shrink: 0;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.72);
  background: none;
  border: 0;
  border-bottom: 3px solid transparent;
  padding: 12px 0 9px;
  cursor: pointer;
  white-space: nowrap;
}
.tab:hover { color: #fff; border-bottom-color: rgba(245, 197, 24, 0.4); }
.tab.active {
  color: var(--yellow);
  border-bottom-color: var(--yellow);
}
.tab:focus-visible {
  outline: 2px solid var(--yellow);
  outline-offset: 2px;
}

/* Panels */
main.wrap { padding-top: 48px; padding-bottom: 72px; }
.panel { display: none; }
.panel.active { display: block; }

h2 {
  margin: 0 0 24px;
  font-family: var(--serif);
  font-weight: 500;
  font-size: 2rem;
  line-height: 1.2;
  color: var(--purple-dark);
}
/* Highlighter swipe under page titles */
h2::after {
  content: "";
  display: block;
  width: 56px;
  height: 6px;
  margin-top: 8px;
  background: var(--yellow);
  border-radius: 999px;
  transform: rotate(-1.5deg);
}
h3 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.3rem;
  line-height: 1.3;
}
.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px 24px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}
.panel-head h2 { margin: 0; }

.meta {
  margin: 0;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
}
.lede { margin: -8px 0 28px; color: var(--muted); }
.empty { color: var(--muted); }

/* Lists separated by hairlines */
.entry {
  padding: 22px 0;
  border-top: 1px solid var(--rule);
}
.entry:last-child { border-bottom: 1px solid var(--rule); }
.entry p { margin: 0; }

/* Announcements */
.announcement {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 6px 20px;
  align-items: start;
}
.announcement time {
  justify-self: start;
  margin-top: 3px;
  padding: 2px 10px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--purple);
  background: var(--purple-tint);
  border-radius: 999px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}
.announcement:nth-child(3n+2) time { color: var(--green); background: var(--green-tint); }
.announcement:nth-child(3n+3) time { color: #7a5c00; background: var(--yellow-tint); }

/* Problems */
.facts {
  margin: 0 0 40px;
  padding: 16px 20px 16px 36px;
  background: var(--purple-tint);
  border-radius: 12px;
  font-size: 0.92rem;
}
.facts li::marker { color: var(--purple); }
.facts li + li { margin-top: 2px; }

.week { margin-bottom: 40px; }
.week-head {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}
.week-head h3 {
  margin: 0;
  padding: 2px 12px;
  font-size: 0.95rem;
  font-family: var(--sans);
  font-weight: 700;
  color: #fff;
  background: var(--purple);
  border-radius: 999px;
}
.week:nth-child(even) .week-head h3 { background: var(--green); }
.week-head .meta { text-transform: none; letter-spacing: 0; font-weight: 400; }
.current {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--purple-dark);
  background: var(--yellow);
  padding: 2px 10px;
  border-radius: 999px;
  transform: rotate(-3deg);
}

.problem-title {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
}
.problem-title h4 {
  margin: 0;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.2rem;
}
.points {
  flex-shrink: 0;
  padding: 1px 10px;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--green);
  background: var(--green-tint);
  border-radius: 999px;
  font-variant-numeric: tabular-nums;
}
.statement {
  margin-top: 12px;
  padding: 14px 18px;
  font-family: var(--serif);
  font-size: 1.15rem;
  line-height: 1.65;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 12px;
  overflow-x: auto;
}
.diagram {
  display: block;
  max-width: 100%;
  max-height: 360px;
  margin: 14px auto 2px;
}

/* Rules */
.rules {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: rule;
}
.rules li {
  counter-increment: rule;
  display: grid;
  grid-template-columns: 48px 1fr;
  align-items: start;
  padding: 14px 0;
  border-top: 1px solid var(--rule);
}
.rules li:last-child { border-bottom: 1px solid var(--rule); }
.rules li::before {
  content: counter(rule);
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  background: var(--purple);
  border-radius: 50%;
}
.rules li:nth-child(3n+2)::before { background: var(--green); }
.rules li:nth-child(3n+3)::before { background: var(--yellow); color: var(--purple-dark); }

/* Register */
.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: step;
}
.step {
  counter-increment: step;
  position: relative;
  padding: 28px 0 32px 72px;
  border-top: 1px solid var(--rule);
}
.step:last-child { border-bottom: 1px solid var(--rule); }
.step::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 24px;
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  font-family: var(--serif);
  font-size: 1.8rem;
  line-height: 1;
  color: #fff;
  background: var(--purple);
  border-radius: 50%;
  transform: rotate(-6deg);
}
.step:nth-child(2)::before { background: var(--green); transform: rotate(5deg); }
.step h3 { margin-top: 4px; }
.step p { margin: 0 0 14px; }
.step .note {
  padding: 10px 14px;
  background: var(--yellow-tint);
  border-radius: 12px;
  font-size: 0.92rem;
}
.step .button { margin-top: 4px; }
.step:nth-child(2) .button { background: var(--green); }

/* FAQ */
.faq { border-top: 1px solid var(--rule); }
.faq:last-child { border-bottom: 1px solid var(--rule); }
.faq summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 16px 0;
  font-weight: 600;
  cursor: pointer;
  list-style: none;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1;
  color: var(--purple);
  background: var(--purple-tint);
  border-radius: 50%;
  transition: background 0.15s, color 0.15s;
}
.faq[open] summary::after { content: "−"; color: var(--purple-dark); background: var(--yellow); }
.faq summary:hover { color: var(--purple); }
.faq p {
  margin: 0 0 18px;
  padding: 12px 16px;
  color: #403a4a;
  background: var(--purple-tint);
  border-radius: 12px;
}
.faq-more { margin-top: 28px; text-transform: none; letter-spacing: 0; font-weight: 400; font-size: 0.95rem; }

/* Resources */
.resource {
  margin: 0 -14px;
  padding-left: 14px;
  padding-right: 14px;
  border-radius: 12px;
  transition: background 0.15s;
}
.resource:hover { background: var(--yellow-tint); }
.resource h3 { font-size: 1.2rem; margin: 0 0 4px; }
.resource h3 a { text-decoration: none; }
.resource h3 a:hover { text-decoration: underline; text-decoration-color: var(--yellow); }
.resource .arrow { font-family: var(--sans); font-size: 0.85rem; color: var(--green); font-weight: 700; }
.resource p { color: var(--muted); }

/* Leaderboard */
.leaderboard {
  width: 100%;
  border-collapse: collapse;
  font-variant-numeric: tabular-nums;
}
.leaderboard th {
  padding: 0 12px 10px;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--purple);
  border-bottom: 3px solid var(--purple);
}
.leaderboard td {
  padding: 14px 12px;
  border-bottom: 1px solid var(--rule);
}
.leaderboard tbody tr:nth-child(even) td { background: #faf7fd; }
.leaderboard th:first-child, .leaderboard td:first-child { padding-left: 12px; }
.leaderboard th:last-child, .leaderboard td:last-child { padding-right: 12px; }
.leaderboard .rank {
  width: 70px;
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--muted);
}
.leaderboard th.rank, .leaderboard th.score { font-family: var(--sans); font-size: 0.8rem; color: var(--purple); }
.leaderboard .team { font-weight: 500; }
.leaderboard .score { width: 90px; text-align: right; font-weight: 700; color: var(--green); }
.leaderboard .top-1 td { background: var(--yellow-tint); }
.leaderboard .top-1 .rank {
  color: var(--purple-dark);
  font-weight: 700;
}
.leaderboard .top-1 .rank::before {
  content: "";
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 8px;
  vertical-align: 2px;
  background: var(--yellow);
  border-radius: 50%;
  box-shadow: 0 0 0 3px #fff;
}

/* Buttons */
.button {
  display: inline-block;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #fff;
  background: var(--purple);
  border-radius: 999px;
  text-decoration: none;
  transition: background 0.15s;
}
.button:hover { background: var(--purple-dark); }
.step:nth-child(2) .button:hover { background: #175c34; }
.button:focus-visible { outline: 2px solid var(--purple); outline-offset: 3px; }

/* Footer */
.site-footer {
  font-size: 0.85rem;
  color: #d8cdee;
  background: var(--purple-dark);
}
.site-footer::before {
  content: "";
  display: block;
  height: 5px;
  background: var(--stripe);
}
.site-footer .wrap { padding-top: 22px; padding-bottom: 24px; }

@media (max-width: 560px) {
  .masthead-top { padding-top: 28px; padding-bottom: 18px; }
  .masthead h1 { font-size: 2.1rem; }
  main.wrap { padding-top: 36px; }
  h2 { font-size: 1.7rem; }
  .announcement { grid-template-columns: 1fr; }
  .step { padding-left: 60px; }
  .step::before { width: 42px; height: 42px; font-size: 1.5rem; }
}