:root {
  --bg: #f7f8fc;
  --surface: #ffffff;
  --surface-2: #eef1fa;
  --ink: #12162b;
  --ink-2: #4a5170;
  --ink-3: #6e7592;
  --line: #dde2f0;
  --accent: #2f5bea;
  --accent-ink: #1f3aa8;
  --accent-soft: #e5ebff;
  --ok: #17865a;
  --code-bg: #0f1428;
  --code-ink: #e4e8ff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(18, 22, 43, .05), 0 8px 24px rgba(18, 22, 43, .06);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0f1e;
    --surface: #141930;
    --surface-2: #1a2040;
    --ink: #edf0ff;
    --ink-2: #b4bbdb;
    --ink-3: #8a92b8;
    --line: #262d52;
    --accent: #7d9bff;
    --accent-ink: #a9bcff;
    --accent-soft: #1d2654;
    --ok: #4fd39a;
    --code-bg: #080b17;
    --code-ink: #e4e8ff;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 8px 24px rgba(0, 0, 0, .25);
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "Segoe UI", Roboto, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
img, svg { max-width: 100%; }
a { color: var(--accent); text-underline-offset: 2px; }
a:hover { color: var(--accent-ink); }
code, pre, kbd { font-family: ui-monospace, "SF Mono", SFMono-Regular, Menlo, Consolas, monospace; font-size: .9em; }
:not(pre) > code { background: var(--surface-2); border-radius: 6px; padding: .1em .35em; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -.02em; margin: 0 0 .5em; }
h2 { font-size: clamp(28px, 4vw, 38px); }
h3 { font-size: 19px; letter-spacing: -.01em; }
p { margin: 0 0 1em; }

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

.skip-link { position: absolute; left: -9999px; top: 8px; background: var(--surface); padding: 8px 12px; border-radius: 8px; z-index: 10; }
.skip-link:focus { left: 8px; }

/* nav */
.nav { position: sticky; top: 0; z-index: 5; background: color-mix(in srgb, var(--bg) 85%, transparent); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid var(--line); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 16px; }
.wordmark { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ink); text-decoration: none; letter-spacing: -.01em; }
.wordmark img { border-radius: 7px; }
.nav-links { display: flex; gap: 22px; align-items: center; font-size: 15px; }
.nav-links a { color: var(--ink-2); text-decoration: none; }
.nav-links a:hover { color: var(--ink); }
@media (max-width: 720px) { .nav-hide { display: none; } }

/* hero */
.hero { padding: 72px 0 56px; }
.hero-inner { display: grid; gap: 48px; align-items: center; }
@media (min-width: 900px) { .hero-inner { grid-template-columns: 1.1fr .9fr; } }
.eyebrow { color: var(--accent); font-weight: 600; font-size: 14px; letter-spacing: .06em; text-transform: uppercase; margin-bottom: 14px; }
.hero h1 { font-size: clamp(40px, 6.4vw, 64px); letter-spacing: -.035em; }
.hero-sub { font-size: 19px; color: var(--ink-2); max-width: 34em; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin: 28px 0 18px; }
.btn { display: inline-flex; align-items: center; gap: 9px; padding: 12px 20px; border-radius: 11px; font-weight: 600; font-size: 16px; text-decoration: none; border: 1px solid transparent; line-height: 1.2; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-ink); color: #fff; }
@media (prefers-color-scheme: dark) { .btn-primary { color: #0c0f1e; } .btn-primary:hover { color: #0c0f1e; } }
.btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn-secondary:hover { color: var(--ink); border-color: var(--ink-3); }
.fineprint { font-size: 14px; color: var(--ink-3); margin: 0; }

.cmd { display: flex; align-items: center; gap: 8px; background: var(--code-bg); color: var(--code-ink); border-radius: 11px; padding: 6px 6px 6px 16px; max-width: 520px; margin-bottom: 14px; }
.cmd code { flex: 1; min-width: 0; overflow-x: auto; white-space: nowrap; font-size: 14.5px; padding: 6px 0; background: none; }
.cmd code::before { content: "$ "; color: #7f8ab8; }
.copy { flex: none; border: 0; border-radius: 8px; background: rgba(255,255,255,.1); color: var(--code-ink); font: inherit; font-size: 13px; font-weight: 600; padding: 7px 12px; cursor: pointer; }
.copy:hover { background: rgba(255,255,255,.18); }

/* hero art: a mock exchange */
.exchange { background: var(--surface); border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); padding: 20px; font-size: 14.5px; }
.exchange .row { display: grid; grid-template-columns: 74px 1fr; gap: 12px; padding: 12px 0; border-top: 1px solid var(--line); }
.exchange .row:first-child { border-top: 0; padding-top: 0; }
.exchange .who { font-size: 12px; font-weight: 700; letter-spacing: .05em; text-transform: uppercase; color: var(--ink-3); padding-top: 2px; }
.exchange .who.you { color: var(--ok); }
.exchange .who.app { color: var(--accent); }
.exchange code { font-size: 13.5px; word-break: break-word; }
.exchange .names { color: var(--ink-2); }
.pill { display: inline-block; background: var(--accent-soft); color: var(--accent-ink); border-radius: 999px; padding: 1px 9px; font-size: 12.5px; font-weight: 600; margin: 2px 4px 2px 0; }

/* sections */
section { padding: 72px 0; border-top: 1px solid var(--line); }
.lede { font-size: 19px; color: var(--ink-2); max-width: 44em; margin-bottom: 36px; }
.grid { display: grid; gap: 18px; }
@media (min-width: 720px) { .grid-2 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.card p { color: var(--ink-2); margin: 0; font-size: 16px; }
.card p + p { margin-top: .7em; }
.step-no { display: inline-flex; width: 30px; height: 30px; border-radius: 50%; align-items: center; justify-content: center; background: var(--accent-soft); color: var(--accent-ink); font-weight: 700; font-size: 15px; margin-bottom: 14px; }

.checklist { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
@media (min-width: 720px) { .checklist { grid-template-columns: repeat(2, 1fr); gap: 16px 36px; } }
.checklist li { padding-left: 30px; position: relative; color: var(--ink-2); }
.checklist li::before { content: ""; position: absolute; left: 0; top: .35em; width: 18px; height: 18px; border-radius: 50%; background: var(--accent-soft) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5 9.3l2.6 2.6L13 6.5' fill='none' stroke='%232f5bea' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/18px no-repeat; }
.checklist b { color: var(--ink); }

.note { border-left: 3px solid var(--accent); background: var(--surface); border-radius: 0 12px 12px 0; padding: 16px 20px; color: var(--ink-2); font-size: 16px; margin-top: 28px; }

pre.term { background: var(--code-bg); color: var(--code-ink); border-radius: 12px; padding: 16px 18px; overflow-x: auto; font-size: 14px; line-height: 1.55; margin: 0 0 1em; }
pre.term .c { color: #7f8ab8; }
.install h3 { margin-top: 8px; }

/* footer */
footer { border-top: 1px solid var(--line); padding: 36px 0 48px; font-size: 15px; color: var(--ink-3); }
.foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px; align-items: center; }
.foot-links { display: flex; flex-wrap: wrap; gap: 20px; }
.foot-links a { color: var(--ink-2); text-decoration: none; }
.foot-links a:hover { color: var(--ink); }
footer a.co { color: var(--ink-2); }

/* 404 */
.notfound { min-height: 60vh; display: flex; align-items: center; padding: 72px 0; }
.notfound h1 { font-size: clamp(36px, 6vw, 52px); }

/* keep long code from widening grid tracks on small screens */
.hero-inner > *, .grid > * { min-width: 0; }
.exchange .row { grid-template-columns: 96px minmax(0, 1fr); }
@media (max-width: 480px) { .exchange .row { grid-template-columns: 1fr; gap: 4px; } }