/* shared shell: page colours, type, topbar and pill buttons */

* { box-sizing: border-box; }

:root {
  --bar: 84px;
  --page: #f5f5f6;
  --card: #fff;
  --ink: #111;
  --muted: #71717a;
  --faint: #a1a1aa;
  --line: #e7e7e9;
  --edge: #c9c9cf;
  /* Roboto Mono: plain round zero, no slash or dot through it */
  --mono: "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

html, body {
  margin: 0;
  min-height: 100%;
  /* off-white so the white edge light reads against the page */
  background: var(--page);
  color: var(--ink);
}

body {
  display: flex;
  flex-direction: column;
  font-family: Inter, "Helvetica Neue", Helvetica, Arial, sans-serif;
}

.topbar {
  /* rides along at the top; bare over the page, panelled once scrolled */
  position: sticky;
  top: 0;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--bar);
  padding: 0 36px;
  background: transparent;
  /* transparent up front so the line can appear without shifting the layout */
  border-bottom: 1px solid transparent;
  transition: background-color 240ms ease, border-color 240ms ease;
}

.topbar.is-stuck {
  background-color: rgba(245, 245, 246, 0.72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--line);
}

.wordmark {
  color: var(--ink);
  text-decoration: none;
  font-family: Inter, Arial, sans-serif;
  font-size: 34px;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.05em;
}

.menu {
  width: 36px;
  height: 36px;
  padding: 0;
  border: 0;
  background: transparent;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}

.menu span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
}

.btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 12px 26px;
  font: 500 16px/1.2 inherit;
  letter-spacing: -0.01em;
  text-decoration: none;
  cursor: default;
}

/* only the ones that actually go somewhere behave like links */
a.btn {
  cursor: pointer;
  transition: border-color 180ms ease, background-color 180ms ease;
}

.btn-fill {
  border: 0;
  background: var(--ink);
  color: #fff;
}

a.btn-fill:hover {
  background: #000;
}

.btn-ghost {
  border: 1px solid #e5e5e5;
  background: #fff;
  color: var(--ink);
}

a.btn-ghost:hover {
  border-color: var(--edge);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (max-width: 640px) {
  :root { --bar: 72px; }
  .topbar { padding: 0 20px; }
  .wordmark { font-size: 28px; }
}