:root {
  --bg: #f27565;
  --ink: #ffffff;
  --ink-soft: rgba(255, 255, 255, .85);
  --line: rgba(255, 255, 255, .3);
  --dark: #2a0f0a;
  --cream: #fffbef;
  --shadow: #a33e2c;
  --shadow-deep: #6e2519;
  --radius: 14px;
  --gutter: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--ink); text-decoration-thickness: 2px; text-underline-offset: 3px; }

h1, h2 { line-height: 1.15; margin: 0 0 .5em; }
h2 { font-size: 1.35rem; }
h3 { font-size: 1.05rem; margin: 1.4em 0 .2em; }

.note {
  margin: 12px 0 0;
  padding: 12px 14px;
  border-left: 3px solid var(--cream);
  background: rgba(255, 255, 255, .12);
  border-radius: 0 8px 8px 0;
  font-size: .95rem;
}

/* Header */
.hero {
  max-width: 640px;
  margin: 0 auto;
  padding: 40px var(--gutter) 24px;
}
.hero-icon { border-radius: 20px; display: block; margin-bottom: 20px; }
.eyebrow {
  margin: 0 0 4px;
  font-size: .8rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.updated { margin: 0 0 10px; font-size: .8rem; color: var(--ink-soft); }
h1 { font-size: clamp(1.9rem, 8vw, 2.8rem); letter-spacing: -.02em; }
.lead { font-size: 1.15rem; margin: 0 0 12px; }
.meta { margin: 0; color: var(--ink-soft); font-size: .95rem; }
.talk-link { margin-top: 4px; }

/* Contents, sticky so it's reachable while scrolling on a phone */
.toc {
  position: sticky;
  top: 0;
  z-index: 1;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  /* Line the pills up with the 640px text column, the bar itself stays full width */
  padding: 10px max(var(--gutter), calc((100% - 640px) / 2 + var(--gutter)));
  background: var(--bg);
  border-bottom: 1px solid var(--line);
  scrollbar-width: none;
}
.toc::-webkit-scrollbar { display: none; }
.toc a {
  flex: none;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--cream);
  color: var(--dark);
  font-size: .9rem;
  font-weight: 600;
  text-decoration: none;
}

/* Sections */
main {
  max-width: 640px;
  margin: 0 auto;
  padding: 8px var(--gutter) 40px;
}
section {
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
  scroll-margin-top: 56px;
}
section:last-child { border-bottom: 0; }

.card {
  background: var(--shadow);
  border-radius: var(--radius);
  padding: 20px;
  margin-top: 24px;
  box-shadow: 0 6px 0 var(--shadow-deep);
}

/* Datasets & references */
.list { list-style: none; padding: 0; margin: 0; }
.list li {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  border-top: 1px solid var(--line);
}
.list li span { color: var(--ink-soft); font-size: .95rem; }

/* Approach */
.steps { padding-left: 1.3em; margin: 0; }
.steps li { padding: 6px 0; }
.steps li::marker { font-weight: 700; }

code {
  font: .85em/1.5 ui-monospace, SFMono-Regular, Menlo, monospace;
  background: rgba(255, 255, 255, .18);
  padding: .1em .35em;
  border-radius: 4px;
  overflow-wrap: anywhere;
}
pre {
  margin: 10px 0;
  padding: 12px 14px;
  background: var(--shadow-deep);
  border-radius: 8px;
  overflow-x: auto;
}
pre code {
  background: none;
  padding: 0;
  font-size: .8rem;
  overflow-wrap: normal;
  white-space: pre;
}

/* Collapsible screenshot */
.screenshot {
  margin-top: 20px;
  padding: 12px 14px;
  background: rgba(255, 255, 255, .12);
  border-radius: 8px;
}
.screenshot > summary { font-weight: 600; cursor: pointer; }
.screenshot figure { margin: 12px 0 0; }
.screenshot img { display: block; width: 100%; height: auto; border-radius: 6px; }
.screenshot figcaption { margin-top: 8px; font-size: .9rem; color: var(--ink-soft); }

/* Collapsible sections */
.fold > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  list-style: none;
  cursor: pointer;
}
.fold > summary::-webkit-details-marker { display: none; }
.fold > summary h2 { margin: 0; }
.fold > summary::after {
  content: "";
  flex: none;
  width: 9px;
  height: 9px;
  margin-right: 6px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  transform: rotate(45deg);
  transition: transform .2s;
}
.fold[open] > summary::after { transform: rotate(-135deg); }
.fold[open] > summary { margin-bottom: .6em; }

.button {
  display: inline-block;
  margin-top: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  background: var(--cream);
  color: var(--dark);
  font-weight: 600;
  text-decoration: none;
}

.button.is-disabled {
  background: rgba(255, 255, 255, .35);
  color: rgba(42, 15, 10, .5);
  cursor: not-allowed;
}

footer {
  max-width: 640px;
  margin: 0 auto;
  padding: 24px var(--gutter) 48px;
  border-top: 1px solid var(--line);
  font-size: .95rem;
}