:root {
  --honey: #f5b301;
  --honey-deep: #c98a00;
  --honey-soft: #fff4d1;
  --ink: #1a1a1a;
  --ink-soft: #3d3d3d;
  --paper: #fffdf7;
  --rule: #efe6c8;
  --accent: #2a2a2a;
  --max-width: 1080px;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 8px 24px rgba(201,138,0,.08);
  font-size: 16px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--honey-deep); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Top navigation */
.nav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(255, 253, 247, .92);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .8rem 1.25rem;
  max-width: var(--max-width);
  margin: 0 auto;
  gap: 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: .55rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -.01em;
}
.brand img { width: 28px; height: 28px; }
.brand span { font-size: 1.05rem; }
.nav-links {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  font-size: .95rem;
}
.nav-links a { color: var(--ink-soft); }
.nav-links a.active { color: var(--ink); border-bottom: 2px solid var(--honey); padding-bottom: 2px; }

/* Dropdown for challenges */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute;
  top: 110%;
  right: 0;
  min-width: 240px;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: .5rem;
  display: none;
}
.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu { display: block; }
.dropdown-menu a {
  display: block;
  padding: .55rem .75rem;
  border-radius: 8px;
  color: var(--ink);
  font-size: .92rem;
}
.dropdown-menu a:hover { background: var(--honey-soft); text-decoration: none; }
.dropdown-menu .muted { color: var(--ink-soft); font-size: .8rem; }

/* Hero */
.hero {
  padding: 4rem 0 2.5rem;
  text-align: center;
  background:
    radial-gradient(80% 60% at 50% 0%, rgba(245,179,1,.18) 0%, rgba(245,179,1,0) 60%),
    var(--paper);
}
.hero img.logo { width: 96px; height: 96px; margin-bottom: 1rem; }
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  margin: .25rem 0 .5rem;
  letter-spacing: -.02em;
  line-height: 1.1;
}
.hero .tagline {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 640px;
  margin: 0 auto;
}
.hero .pronounce { font-style: italic; color: var(--ink-soft); font-size: .95rem; margin-top: .25rem; }
.cta-row {
  display: flex;
  gap: .75rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 1.75rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem 1.1rem;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  transition: transform .08s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--honey); color: var(--ink); }
.btn-primary:hover { background: var(--honey-deep); color: var(--paper); }
.btn-secondary { background: var(--paper); color: var(--ink); border-color: var(--rule); }
.btn-secondary:hover { border-color: var(--honey); }

/* Sections */
section { padding: 3rem 0; }
section + section { border-top: 1px solid var(--rule); }
h2 {
  font-size: 1.6rem;
  margin: 0 0 1rem;
  letter-spacing: -.01em;
}
h3 { font-size: 1.15rem; margin: 1.5rem 0 .5rem; }
p { margin: 0 0 1rem; }

.lead { font-size: 1.1rem; color: var(--ink-soft); }

/* Feature grid */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin-top: 1.25rem;
}
.feature {
  padding: 1.25rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
}
.feature h3 { margin-top: 0; }
.feature .icon { font-size: 1.5rem; }

/* Code blocks */
pre, code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .92rem;
}
pre {
  background: #1f1d18;
  color: #f6efd9;
  padding: 1rem 1.1rem;
  border-radius: var(--radius);
  overflow-x: auto;
  line-height: 1.5;
}
p code, li code { background: var(--honey-soft); padding: .1rem .35rem; border-radius: 4px; color: var(--ink); }

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: .95rem;
}
th, td {
  text-align: left;
  padding: .65rem .8rem;
  border-bottom: 1px solid var(--rule);
  vertical-align: top;
}
th { background: var(--honey-soft); }

/* Callout */
.callout {
  background: var(--honey-soft);
  border-left: 4px solid var(--honey);
  padding: 1rem 1.1rem;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.25rem 0;
}
.callout strong { color: var(--ink); }

/* Prize cards (unified styling) */
.prizes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}
.prize {
  text-align: center;
  padding: 1rem .75rem;
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  background: var(--paper);
}
.prize .medal { font-size: 1.6rem; }
.prize .amount { font-size: 1.3rem; font-weight: 700; color: var(--honey-deep); }
.prize .label { color: var(--ink-soft); font-size: .85rem; }

/* Figures */
.figure {
  margin: 1.5rem 0;
  text-align: center;
}
.figure img, .figure svg { max-width: 100%; height: auto; border-radius: var(--radius); }
.figure figcaption { color: var(--ink-soft); font-size: .9rem; margin-top: .5rem; }

/* Status banner */
.status-banner {
  background: var(--honey-soft);
  border-bottom: 1px solid var(--honey);
  padding: .75rem 1.25rem;
  text-align: center;
  font-size: .95rem;
  color: var(--ink);
}
.status-banner strong { color: var(--honey-deep); }

/* Podium block */
.podium-wrap {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2rem;
  align-items: center;
  margin: 1rem 0 1.5rem;
}
.podium-wrap .legend { font-size: .95rem; }
.podium-wrap .legend ul { padding-left: 1.1rem; margin: .75rem 0; }
.podium-wrap .legend li { margin: .35rem 0; }
@media (max-width: 720px) {
  .podium-wrap { grid-template-columns: 1fr; }
}

/* Math (MathJax overrides) */
mjx-container { font-size: 1.05em !important; }
.formula mjx-container { margin: 0 !important; }

/* Partner / powered-by row */
.partners {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-top: 1rem;
  color: var(--ink-soft);
  font-size: .9rem;
}
.partners .techwolf-logo {
  height: 22px;
  width: auto;
  color: var(--ink);
}
.partners .avature-logo {
  height: 22px;
  width: auto;
  vertical-align: middle;
}
.partners .recsys-hr-logo {
  height: 28px;
  width: auto;
  vertical-align: middle;
}
.partners a { display: inline-flex; align-items: center; gap: .5rem; color: var(--ink); }
.partners a:hover { color: var(--honey-deep); text-decoration: none; }

/* Two-column "text + figure" split */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  margin: 1.5rem 0;
}
.split .figure { margin: 0; }
.split .figure img, .split .figure svg { max-width: 100%; height: auto; }
@media (max-width: 720px) {
  .split { grid-template-columns: 1fr; }
}

/* Offset anchored sections so the sticky nav doesn't cover their headings */
section[id], footer[id] { scroll-margin-top: 5rem; }

/* Quick-link cards (eye-catching CTAs near the top of a section) */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 1.5rem;
}
.quick-link {
  display: flex;
  align-items: center;
  gap: .9rem;
  padding: 1rem 1.1rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-left: 4px solid var(--honey);
  border-radius: var(--radius);
  color: var(--ink);
  box-shadow: var(--shadow);
  transition: transform .08s ease, border-color .08s ease;
}
.quick-link:hover {
  text-decoration: none;
  transform: translateY(-1px);
  border-color: var(--honey);
}
.quick-link-icon {
  font-size: 1.6rem;
  line-height: 1;
  flex-shrink: 0;
}
.quick-link-text { display: flex; flex-direction: column; }
.quick-link-text strong { color: var(--ink); font-size: 1.02rem; }
.quick-link-sub { color: var(--ink-soft); font-size: .88rem; margin-top: .15rem; }

/* Teaser placeholder card */
.teaser-card {
  border: 2px dashed var(--honey);
  background: var(--honey-soft);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin: 1rem 0;
  text-align: center;
}
.teaser-card h3 { margin-top: 0; }

/* Formula */
.formula {
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 1.05rem;
  text-align: center;
  overflow-x: auto;
}

/* Footer */
footer {
  margin-top: 2rem;
  padding: 2.5rem 0;
  border-top: 1px solid var(--rule);
  background: #fbf5e3;
  color: var(--ink-soft);
  font-size: .9rem;
}
footer .container { display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: space-between; }
footer a { color: var(--ink-soft); }
footer a:hover { color: var(--honey-deep); }

/* Small tweaks */
@media (max-width: 600px) {
  .hero { padding: 2.5rem 0 1.5rem; }
  .nav-links { font-size: .9rem; gap: .9rem; }
}