/* CycleSignal project write-up.
   Editorial on purpose, so it reads as an article ABOUT the app, not the app itself:
   white paper, Fraunces serif headlines, DM Sans text. Shared with the app: logo and raspberry accent. */
:root {
  --ink: #2a1a2e; --body: #3f3443; --muted: #6f6472; --raspberry: #a8336a; --purple: #6d5899;
  --rule: #ece4ea; --soft: #faf6f9; --paper: #ffffff;
  --serif: "Fraunces", Georgia, serif;
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--body);
  font: 17.5px/1.75 "DM Sans", system-ui, sans-serif; -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}
img { max-width: 100%; height: auto; }
a { color: var(--raspberry); text-decoration-color: rgba(168, 51, 106, 0.35); text-underline-offset: 3px;
  transition: text-decoration-color 160ms ease; }
@media (hover: hover) and (pointer: fine) { a:hover { text-decoration-color: currentColor; } }
:focus-visible { outline: 2px solid var(--raspberry); outline-offset: 3px; border-radius: 4px; }

/* Masthead */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--rule); }
.nav-inner { max-width: 1040px; margin: 0 auto; padding: 10px 20px; display: flex; align-items: center; gap: 18px; }
.nav-brand { display: flex; align-items: center; gap: 8px; font-weight: 700; color: var(--ink); text-decoration: none; font-size: 16px; white-space: nowrap; }
.nav-brand small { font-weight: 500; color: var(--muted); font-size: 13.5px; padding-left: 10px; margin-left: 2px; border-left: 1px solid var(--rule); }
.nav-links { display: flex; gap: 2px; flex: 1; overflow-x: auto; scrollbar-width: none; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 500; padding: 6px 9px;
  border-radius: 6px; white-space: nowrap; transition: color 160ms ease, background-color 160ms ease; }
@media (hover: hover) and (pointer: fine) { .nav-links a:hover { color: var(--ink); background: var(--soft); } }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; font-size: 15px; text-decoration: none;
  padding: 11px 18px; border-radius: 8px; border: 1px solid var(--rule); background: #fff; color: var(--ink);
  transition: transform 160ms var(--ease-out), background-color 160ms ease, border-color 160ms ease; }
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--raspberry); border-color: var(--raspberry); color: #fff; }
.btn-small { padding: 7px 12px; font-size: 13.5px; }
@media (hover: hover) and (pointer: fine) {
  .btn:hover { border-color: var(--raspberry); }
  .btn-primary:hover { background: #932b5c; }
}

/* Article header */
.masthead { max-width: 1040px; margin: 0 auto; padding: 64px 20px 8px; }
.kicker { display: flex; align-items: center; gap: 10px; color: var(--raspberry); font-weight: 700; font-size: 13px;
  letter-spacing: 0.1em; text-transform: uppercase; }
.masthead h1 { font-family: var(--serif); font-weight: 600; color: var(--ink); font-size: clamp(44px, 7vw, 76px);
  line-height: 1; letter-spacing: -0.02em; margin: 18px 0 14px; font-optical-sizing: auto; }
.masthead .dek { font-family: var(--serif); font-weight: 400; color: var(--ink); font-size: clamp(21px, 2.8vw, 28px);
  line-height: 1.3; max-width: 760px; margin: 0 0 18px; }
.masthead .lede { color: var(--muted); font-size: 18px; max-width: 720px; margin: 0 0 22px; }
.contributors { max-width: 1000px; margin-top: 8px; padding-top: 18px; border-top: 1px solid var(--rule); }
.contributors .label { margin-bottom: 4px; }
.byline { display: flex; flex-wrap: wrap; gap: 6px 18px; color: var(--muted); font-size: 14.5px; padding: 14px 0;
  border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); max-width: 1000px; }
.byline b { color: var(--ink); font-weight: 600; }
.cta { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 22px; }

/* The app, shown as a figure inside the article */
.app-figure { max-width: 1040px; margin: 40px auto 0; padding: 0 20px; }
.app-frame { background: var(--soft); border: 1px solid var(--rule); border-radius: 14px; padding: 18px; }
.app-frame .bar { display: flex; align-items: center; gap: 6px; margin-bottom: 12px; }
.app-frame .bar i { width: 9px; height: 9px; border-radius: 50%; background: #e2d4de; }
.app-frame .bar span { margin-left: 10px; font-size: 12.5px; color: var(--muted); font-weight: 500; }
.app-frame img { display: block; border-radius: 8px; border: 1px solid var(--rule); box-shadow: 0 8px 30px rgba(42, 26, 46, 0.08); }
.figcap { color: var(--muted); font-size: 14px; margin-top: 10px; }
.figcap b { color: var(--ink); }

/* Key numbers and team */
.band { max-width: 1040px; margin: 0 auto; padding: 48px 20px 0; }
.label { color: var(--raspberry); font-weight: 700; font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; margin: 0 0 14px; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); border-top: 2px solid var(--ink); }
.stat { padding: 16px 20px 18px 0; border-bottom: 1px solid var(--rule); }
.stat b { display: block; font-family: var(--serif); font-weight: 600; color: var(--ink); font-size: 40px; line-height: 1.1;
  font-variant-numeric: lining-nums tabular-nums; }
.stat span { color: var(--muted); font-size: 14.5px; line-height: 1.45; display: block; margin-top: 4px; max-width: 220px; }
.team { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0 24px; }
.person { display: flex; align-items: center; gap: 12px; padding: 12px 0; border-bottom: 1px solid var(--rule); }
.avatar { flex: none; width: 40px; height: 40px; border-radius: 50%; display: grid; place-items: center; font-weight: 700;
  color: var(--raspberry); background: var(--soft); border: 1px solid var(--rule); font-size: 14px; }
.person b { display: block; color: var(--ink); font-size: 15.5px; line-height: 1.3; }
.person small { font-size: 13.5px; }
.person small a { margin-right: 10px; }

/* Article body */
.prose { max-width: 700px; margin: 0 auto; padding: 24px 20px 72px; }
.prose h2 { font-family: var(--serif); font-weight: 600; color: var(--ink); font-size: 34px; letter-spacing: -0.015em;
  line-height: 1.15; margin: 72px 0 14px; }
.prose h3 { color: var(--ink); font-size: 20px; margin: 40px 0 6px; }
.prose p, .prose li { color: var(--body); }
.prose strong { color: var(--ink); }
.prose img { border: 1px solid var(--rule); border-radius: 10px; margin: 20px 0 4px; background: #fff; }
.prose .caption { display: block; color: var(--muted); font-size: 14px; margin: 0 0 22px; }
.prose table { width: 100%; border-collapse: collapse; font-size: 15px; margin: 20px 0; display: block; overflow-x: auto; }
.prose th { text-align: left; color: var(--ink); font-weight: 700; border-bottom: 2px solid var(--ink); }
.prose th, .prose td { padding: 9px 12px 9px 0; border-bottom: 1px solid var(--rule); vertical-align: top; }
.callout { border-left: 3px solid var(--raspberry); padding: 4px 0 4px 18px; margin: 26px 0; color: var(--muted); font-size: 16px; }
.callout p { margin: 0; }
.glance { background: var(--soft); border: 1px solid var(--rule); border-radius: 12px; padding: 16px 22px 6px; margin: 8px 0 8px; }
.glance-title { font-weight: 700; color: var(--raspberry); font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; margin: 0 0 4px; }
.glance ul { margin: 0 0 10px; padding-left: 20px; }
.glance li { margin: 4px 0; font-size: 16px; }
.prose h4 { color: var(--ink); font-size: 17px; margin: 26px 0 2px; }
.prose li { margin: 4px 0; }
.refs li { font-size: 15px; margin-bottom: 6px; }

/* Footer */
.footer { border-top: 1px solid var(--rule); background: var(--soft); }
.footer-inner { max-width: 1040px; margin: 0 auto; padding: 22px 20px; display: flex; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; color: var(--muted); font-size: 14px; }
.footer img { vertical-align: -3px; }

@media (max-width: 640px) {
  body { font-size: 16.5px; }
  .masthead { padding-top: 40px; }
  .nav-brand small, .nav .btn-small { display: none; }
  .kicker { font-size: 12px; letter-spacing: 0.08em; }
  .prose h2 { font-size: 28px; margin-top: 56px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn, a, .nav-links a { transition: none; }
  .btn:active { transform: none; }
}