/* =====================================================================
   Mr. Whipple's Math Lab  -  shared styles for every page
   ===================================================================== */
@import url("https://fonts.googleapis.com/css2?family=Fredoka:wght@500;600;700&family=Nunito:wght@400;600;700;800&family=JetBrains+Mono:wght@500;700&display=swap");

:root {
  --bg: #FFF8EC;
  --surface: #FFFFFF;
  --sunk: #F6EBD8;
  --line: #E8D9BE;
  --ink: #2A2118;
  --ink2: #5F5243;
  --ink3: #8E806E;
  --brand: #E0831B;       /* leopard orange */
  --brand-ink: #FFFFFF;
  --spot: #3A2A1A;

  --sun: #F7B32B;   --sun-soft: #FFF0C9;   --sun-ink: #7A5200;
  --berry: #E5487A; --berry-soft: #FCDDE7; --berry-ink: #8E1B42;
  --mint: #22B38A;  --mint-soft: #D3F4E9;  --mint-ink: #0B6B51;
  --sky: #3B8FE6;   --sky-soft: #DCEBFC;   --sky-ink: #174F8C;
  --grape: #8A5CE0; --grape-soft: #EAE0FB; --grape-ink: #4E2A94;

  --radius: 18px;
  --shadow: 0 2px 0 rgba(58, 42, 26, .10), 0 10px 24px -12px rgba(58, 42, 26, .25);
  --maxw: 1100px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #1B1712; --surface: #262019; --sunk: #2F281F; --line: #43392C;
    --ink: #F6EEE2; --ink2: #CDBFAC; --ink3: #9A8C79;
    --brand: #F3A042; --brand-ink: #1B1712; --spot: #F6EEE2;
    --sun-soft: #3D3114; --sun-ink: #FFD779;
    --berry-soft: #43202C; --berry-ink: #FFA3C0;
    --mint-soft: #133A2F; --mint-ink: #7FE6C6;
    --sky-soft: #172D45; --sky-ink: #A3CCFA;
    --grape-soft: #2D2345; --grape-ink: #C9B2FA;
    --shadow: 0 2px 0 rgba(0,0,0,.4), 0 10px 24px -12px rgba(0,0,0,.6);
  }
}
:root[data-theme="dark"] {
  --bg: #1B1712; --surface: #262019; --sunk: #2F281F; --line: #43392C;
  --ink: #F6EEE2; --ink2: #CDBFAC; --ink3: #9A8C79;
  --brand: #F3A042; --brand-ink: #1B1712; --spot: #F6EEE2;
  --sun-soft: #3D3114; --sun-ink: #FFD779;
  --berry-soft: #43202C; --berry-ink: #FFA3C0;
  --mint-soft: #133A2F; --mint-ink: #7FE6C6;
  --sky-soft: #172D45; --sky-ink: #A3CCFA;
  --grape-soft: #2D2345; --grape-ink: #C9B2FA;
  --shadow: 0 2px 0 rgba(0,0,0,.4), 0 10px 24px -12px rgba(0,0,0,.6);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;
  font-size: 17px; line-height: 1.5; min-height: 100vh;
  display: flex; flex-direction: column;
}
h1, h2, h3 { font-family: "Fredoka", "Nunito", sans-serif; line-height: 1.1; margin: 0; }
a { color: inherit; }
button { font: inherit; color: inherit; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
main { flex: 1; width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 24px 16px 40px; }

/* ---------- Top bar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: var(--surface); border-bottom: 3px solid var(--brand);
  box-shadow: 0 4px 16px -10px rgba(0,0,0,.3);
}
.topbar-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; gap: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; margin-right: auto; }
.brand-mark {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  font-family: "Fredoka", sans-serif; font-weight: 700; font-size: 24px;
  background: var(--brand); color: var(--brand-ink); transform: rotate(-6deg);
  box-shadow: 3px 3px 0 var(--spot);
}
.brand-text { font-family: "Fredoka", sans-serif; font-size: 20px; font-weight: 600; }
.brand-text b { color: var(--brand); font-weight: 700; }

.menu { display: flex; align-items: center; gap: 6px; }
.menu-link, .dd-btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 9px 14px; border-radius: 999px;
  text-decoration: none; font-weight: 800; font-size: 16px; border: 0; background: none; cursor: pointer;
}
.menu-link:hover, .dd-btn:hover, .dd.open .dd-btn { background: var(--sunk); }
.menu-link.is-current, .dd.is-current > .dd-btn { background: var(--brand); color: var(--brand-ink); }
.caret { width: 0; height: 0; border-left: 5px solid transparent; border-right: 5px solid transparent;
  border-top: 6px solid currentColor; transition: transform .15s; }
.dd.open .caret { transform: rotate(180deg); }

.dd { position: relative; }
.dd-panel {
  display: none; position: absolute; right: 0; top: calc(100% + 8px); width: 340px;
  background: var(--surface); border: 2px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 8px; max-height: 72vh; overflow-y: auto;
}
.dd.open .dd-panel { display: block; }
.dd-item {
  display: flex; gap: 12px; align-items: flex-start; padding: 10px 12px; border-radius: 12px;
  text-decoration: none; border-left: 5px solid transparent;
}
a.dd-item:hover { background: var(--sunk); }
.dd-item.is-current { background: var(--sunk); }
.dd-item b { display: block; font-size: 16px; }
.dd-item small { display: block; color: var(--ink2); font-size: 13.5px; line-height: 1.35; }
.dd-icon { font-size: 24px; line-height: 1; margin-top: 2px; }
.dd-item.is-soon { opacity: .55; cursor: default; }
.soon { font-style: normal; font-size: 11px; font-weight: 800; letter-spacing: .06em; text-transform: uppercase;
  background: var(--sunk); color: var(--ink2); padding: 2px 7px; border-radius: 999px; margin-left: 4px; }
.dd-item.c-sun { border-left-color: var(--sun); }
.dd-item.c-berry { border-left-color: var(--berry); }
.dd-item.c-mint { border-left-color: var(--mint); }
.dd-item.c-sky { border-left-color: var(--sky); }
.dd-item.c-grape { border-left-color: var(--grape); }

.menu-btn { display: none; width: 46px; height: 42px; border-radius: 12px; border: 2px solid var(--line);
  background: var(--surface); cursor: pointer; align-items: center; justify-content: center; }
.menu-bars, .menu-bars::before, .menu-bars::after { display: block; width: 20px; height: 3px; border-radius: 2px; background: var(--ink); position: relative; }
.menu-bars::before, .menu-bars::after { content: ""; position: absolute; left: 0; }
.menu-bars::before { top: -7px; } .menu-bars::after { top: 7px; }

@media (max-width: 760px) {
  .brand-text { font-size: 17px; }
  .menu-btn { display: inline-flex; }
  .menu {
    display: none; position: absolute; left: 0; right: 0; top: 100%;
    flex-direction: column; align-items: stretch; gap: 4px; padding: 10px 16px 16px;
    background: var(--surface); border-bottom: 3px solid var(--brand); box-shadow: var(--shadow);
    max-height: calc(100vh - 70px); overflow-y: auto;
  }
  .menu.open { display: flex; }
  .menu-link, .dd-btn { width: 100%; justify-content: space-between; border-radius: 12px; }
  .dd-panel { position: static; width: auto; box-shadow: none; border: 0; padding: 4px 0 4px 8px; }
}

/* ---------- Breadcrumb ---------- */
.crumbs {
  max-width: var(--maxw); margin: 0 auto; width: 100%; padding: 14px 16px 0;
  font-size: 14px; color: var(--ink3); display: flex; gap: 8px; flex-wrap: wrap;
}
.crumbs a { color: var(--ink2); font-weight: 700; text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }
.crumbs b { color: var(--ink); }

/* ---------- Page header (inner pages) ---------- */
.page-head { display: flex; gap: 16px; align-items: center; margin: 4px 0 22px; }
.page-head .big-icon {
  font-size: 40px; width: 68px; height: 68px; flex: none; border-radius: 20px;
  display: grid; place-items: center; background: var(--sunk); transform: rotate(-4deg);
}
.page-head h1 { font-size: clamp(30px, 5vw, 44px); }
.page-head p { margin: 4px 0 0; color: var(--ink2); max-width: 60ch; }

/* ---------- Panels, buttons, inputs (shared by tools) ---------- */
.panel {
  background: var(--surface); border: 2px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 18px;
}
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 9px 16px; border-radius: 12px; border: 2px solid var(--line);
  background: var(--surface); font-weight: 800; font-size: 15px; cursor: pointer;
  box-shadow: 0 3px 0 var(--line); transition: transform .05s, box-shadow .05s;
}
.btn:hover { background: var(--sunk); }
.btn:active { transform: translateY(2px); box-shadow: 0 1px 0 var(--line); }
.btn.on, .btn.primary { background: var(--brand); color: var(--brand-ink); border-color: var(--brand); box-shadow: 0 3px 0 var(--spot); }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; }
.label { font-size: 12.5px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; color: var(--ink3); margin: 0 0 8px; }
input[type="number"], input[type="text"] {
  font: inherit; font-weight: 700; padding: 8px 10px; border-radius: 10px;
  border: 2px solid var(--line); background: var(--surface); color: var(--ink); width: 90px;
}
input:focus-visible, .btn:focus-visible, a:focus-visible, button:focus-visible {
  outline: 3px solid var(--sky); outline-offset: 2px;
}
.tip { background: var(--sun-soft); color: var(--sun-ink); border-radius: 12px; padding: 10px 14px; font-size: 15px; margin-top: 14px; }
.tip b { font-weight: 800; }

/* ---------- Home page ---------- */
.hero {
  position: relative; overflow: hidden; border-radius: 28px; padding: 38px 28px;
  background: var(--brand); color: #fff; margin-bottom: 36px; box-shadow: var(--shadow);
}
.hero::before { /* leopard spots */
  content: ""; position: absolute; inset: 0; opacity: .18; pointer-events: none;
  background-image:
    radial-gradient(circle at 20% 30%, #000 0 9px, transparent 10px),
    radial-gradient(circle at 70% 65%, #000 0 7px, transparent 8px),
    radial-gradient(circle at 45% 80%, #000 0 11px, transparent 12px),
    radial-gradient(circle at 85% 20%, #000 0 8px, transparent 9px);
  background-size: 120px 110px;
}
.hero > * { position: relative; }
.hero .kicker { font-weight: 800; letter-spacing: .14em; text-transform: uppercase; font-size: 13px; opacity: .95; }
.hero h1 { font-size: clamp(40px, 8vw, 76px); margin: 8px 0 12px; text-shadow: 3px 3px 0 rgba(0,0,0,.22); }
.hero p { font-size: 19px; max-width: 46ch; margin: 0; font-weight: 600; }
.hero .quick { margin-top: 22px; display: flex; gap: 10px; flex-wrap: wrap; }
.hero .quick a {
  background: #fff; color: #2A2118; text-decoration: none; font-weight: 800; padding: 10px 16px;
  border-radius: 999px; box-shadow: 0 3px 0 rgba(0,0,0,.25);
}
.hero .quick a:hover { transform: translateY(-1px); }
.hero .floaty {
  position: absolute; right: 26px; top: 50%; transform: translateY(-50%) rotate(8deg);
  font-family: "Fredoka", sans-serif; font-weight: 700; font-size: 120px; line-height: 1; opacity: .9;
  text-shadow: 5px 5px 0 rgba(0,0,0,.2);
}
@media (max-width: 760px) { .hero .floaty { display: none; } .hero { padding: 28px 20px; } }

.hub-section { margin-bottom: 36px; scroll-margin-top: 90px; }
.hub-head { display: flex; align-items: baseline; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.hub-head h2 { font-size: 30px; }
.hub-head p { margin: 0; color: var(--ink2); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 16px; }
.card {
  position: relative; display: flex; flex-direction: column; gap: 6px;
  background: var(--surface); border: 2px solid var(--line); border-radius: var(--radius);
  padding: 18px 18px 16px; text-decoration: none; box-shadow: var(--shadow);
  border-top: 8px solid var(--line); transition: transform .12s;
}
a.card:hover { transform: translateY(-3px) rotate(-.4deg); }
.card-icon { font-size: 34px; }
.card h3 { font-size: 22px; }
.card p { margin: 0; color: var(--ink2); font-size: 15px; flex: 1; }
.card-go { font-weight: 800; font-size: 14px; margin-top: 8px; }
.card.is-soon { opacity: .6; box-shadow: none; border-style: dashed; }
.card.c-sun { border-top-color: var(--sun); }     .card.c-sun .card-go { color: var(--sun-ink); }
.card.c-berry { border-top-color: var(--berry); } .card.c-berry .card-go { color: var(--berry-ink); }
.card.c-mint { border-top-color: var(--mint); }   .card.c-mint .card-go { color: var(--mint-ink); }
.card.c-sky { border-top-color: var(--sky); }     .card.c-sky .card-go { color: var(--sky-ink); }
.card.c-grape { border-top-color: var(--grape); } .card.c-grape .card-go { color: var(--grape-ink); }

/* ---------- Footer ---------- */
.site-foot { border-top: 2px solid var(--line); background: var(--surface); }
.pager { max-width: var(--maxw); margin: 0 auto; padding: 18px 16px 4px; display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; }
.pg { text-decoration: none; padding: 10px 14px; border-radius: 14px; border: 2px solid var(--line); background: var(--bg); }
.pg:hover { border-color: var(--brand); }
.pg small { display: block; color: var(--ink3); font-weight: 800; font-size: 12px; text-transform: uppercase; letter-spacing: .08em; }
.pg b { font-size: 16px; }
.pg.next { text-align: right; } .pg.home { text-align: center; }
@media (max-width: 560px) { .pager { grid-template-columns: 1fr 1fr; } .pg.home { grid-column: 1 / -1; order: 3; } }
.foot-note { text-align: center; color: var(--ink3); font-size: 14px; margin: 0; padding: 14px 16px 18px; }

@media print {
  .topbar, .crumbs, .site-foot, .no-print { display: none !important; }
  body { background: #fff; }
}