:root {
  color-scheme: light;
  --site-blue: #2f8fff;
  --site-ink: #071426;
  --site-muted: #5d6b7b;
  --site-paper: #f5f7f9;
  --site-line: rgba(7, 20, 38, .13);
  --site-panel: rgba(255, 255, 255, .82);
  font-family: "Avenir Next", "Helvetica Neue", "PingFang SC", sans-serif;
  background: var(--site-paper);
  color: var(--site-ink);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 82% 8%, rgba(47, 143, 255, .18), transparent 32rem),
    linear-gradient(180deg, #fbfcfd 0, var(--site-paper) 100%);
}

a { color: inherit; }

button,
input,
select,
textarea { font: inherit; }

button,
a { -webkit-tap-highlight-color: transparent; }

:focus-visible {
  outline: 3px solid rgba(47, 143, 255, .45);
  outline-offset: 3px;
}

.site-header,
.site-main,
.site-footer {
  width: min(1120px, calc(100% - 40px));
  margin-inline: auto;
}

.site-header {
  min-height: 88px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--site-line);
}

.site-brand {
  color: var(--site-ink);
  font-size: 30px;
  font-weight: 750;
  letter-spacing: -.07em;
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--site-muted);
  font-size: 14px;
}

.site-nav a {
  text-decoration-thickness: 1px;
  text-underline-offset: 5px;
}

.site-main { padding: clamp(64px, 10vw, 132px) 0 88px; }

.site-intro {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(240px, .75fr);
  gap: clamp(36px, 8vw, 120px);
  align-items: end;
  margin-bottom: clamp(70px, 10vw, 132px);
}

.site-kicker {
  margin: 0 0 22px;
  color: var(--site-blue);
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  font-size: 12px;
  font-weight: 650;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.site-intro h1 {
  max-width: 9ch;
  margin: 0;
  font-size: clamp(58px, 9vw, 116px);
  font-weight: 350;
  line-height: .92;
  letter-spacing: -.075em;
}

.site-intro-copy {
  margin: 0;
  color: var(--site-muted);
  font-size: clamp(17px, 2vw, 22px);
  line-height: 1.55;
}

.site-content {
  display: grid;
  grid-template-columns: minmax(180px, .34fr) minmax(0, 1fr);
  gap: clamp(40px, 8vw, 120px);
}

.site-toc {
  position: sticky;
  top: 24px;
  align-self: start;
  display: grid;
  gap: 12px;
  color: var(--site-muted);
  font-size: 13px;
}

.site-toc strong {
  margin-bottom: 8px;
  color: var(--site-ink);
  font-size: 11px;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.site-article section {
  padding: 0 0 48px;
  margin: 0 0 48px;
  border-bottom: 1px solid var(--site-line);
}

.site-article h2 {
  margin: 0 0 22px;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  letter-spacing: -.045em;
}

.site-article h3 {
  margin: 28px 0 10px;
  font-size: 18px;
}

.site-article p,
.site-article li {
  color: #334155;
  font-size: 16px;
  line-height: 1.8;
}

.site-article ul { padding-left: 1.3em; }

.site-note {
  padding: 20px 22px;
  color: #18487d;
  background: rgba(47, 143, 255, .09);
  border: 1px solid rgba(47, 143, 255, .2);
}

.site-button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  color: white;
  background: var(--site-blue);
  border: 1px solid var(--site-blue);
  border-radius: 10px;
  cursor: pointer;
  font-weight: 650;
}

.site-button-secondary {
  color: var(--site-ink);
  background: transparent;
  border-color: var(--site-line);
}

.site-button:disabled { cursor: wait; opacity: .56; }

.site-form {
  max-width: 760px;
  padding: clamp(24px, 5vw, 52px);
  background: var(--site-panel);
  border: 1px solid rgba(255, 255, 255, .8);
  box-shadow: 0 24px 80px rgba(22, 49, 81, .1);
  backdrop-filter: blur(18px);
}

.site-field { display: grid; gap: 9px; margin-bottom: 24px; }
.site-field label { font-size: 14px; font-weight: 650; }
.site-field small { color: var(--site-muted); line-height: 1.55; }

.site-field input,
.site-field select,
.site-field textarea {
  width: 100%;
  padding: 13px 14px;
  color: var(--site-ink);
  background: rgba(255, 255, 255, .88);
  border: 1px solid var(--site-line);
  border-radius: 8px;
}

.site-field textarea { min-height: 180px; resize: vertical; line-height: 1.65; }
.site-honeypot { position: absolute; left: -10000px; width: 1px; height: 1px; overflow: hidden; }

.site-form-actions { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.site-form-status { min-height: 1.5em; margin: 0; color: var(--site-muted); }
.site-form-status[data-tone="success"] { color: #08774b; }
.site-form-status[data-tone="error"] { color: #b42318; }

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 32px 0 44px;
  color: var(--site-muted);
  border-top: 1px solid var(--site-line);
  font-size: 13px;
}

.site-footer nav { display: flex; gap: 18px; flex-wrap: wrap; }

@media (max-width: 760px) {
  .site-header { align-items: flex-start; padding: 24px 0; }
  .site-nav { gap: 12px; flex-wrap: wrap; justify-content: flex-end; }
  .site-intro,
  .site-content { grid-template-columns: 1fr; }
  .site-toc { position: static; }
  .site-intro h1 { max-width: 12ch; }
  .site-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}