/* OpenBank Developer Portal — self-contained styles (no external fonts/CDN, strict-CSP friendly). */
:root {
  --bg: #0b1020; --bg2: #11182e; --card: #ffffff; --ink: #1b2333; --muted: #5b6478;
  --line: #e6e9f0; --brand: #2f6df6; --brand-ink: #1b4fd0; --warn: #b9551b; --ok: #1d7a4d;
  --radius: 12px; --wrap: 980px;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: #f4f6fb;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, sans-serif; line-height: 1.55; }
.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 1.2rem; }
a { color: var(--brand-ink); }

.topbar { background: var(--bg); color: #fff; position: sticky; top: 0; z-index: 5; }
.topbar .wrap { display: flex; align-items: center; gap: 1.5rem; height: 56px; }
.brand { color: #fff; font-weight: 700; text-decoration: none; letter-spacing: .2px; }
.brand span { color: #9fc3ff; font-weight: 500; }
.topbar nav { display: flex; gap: 1.1rem; flex-wrap: wrap; margin-left: auto; }
.topbar nav a { color: #c7cfe0; text-decoration: none; font-size: .92rem; }
.topbar nav a:hover { color: #fff; }

.hero { background: linear-gradient(160deg, var(--bg), var(--bg2)); color: #fff; padding: 3rem 0 3.2rem; }
.hero .pill { display: inline-block; background: rgba(159,195,255,.16); color: #cfe0ff;
  border: 1px solid rgba(159,195,255,.3); padding: .25rem .7rem; border-radius: 999px; font-size: .8rem; }
.hero h1 { font-size: 2.3rem; margin: .8rem 0 .4rem; line-height: 1.15; }
.lede { font-size: 1.12rem; color: #d7deee; max-width: 70ch; }
.cta { display: flex; gap: .8rem; margin: 1.4rem 0 1rem; flex-wrap: wrap; }
.btn { display: inline-block; padding: .6rem 1.1rem; border-radius: 10px; text-decoration: none;
  border: 1px solid rgba(255,255,255,.25); color: #fff; font-weight: 600; }
.btn.primary { background: var(--brand); border-color: var(--brand); }
.btn:hover { filter: brightness(1.08); }

main { padding: 2.2rem 0 3rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem 1.6rem; margin: 0 0 1.2rem; }
.card h2 { margin: .2rem 0 .8rem; font-size: 1.35rem; }
.card h3 { margin: .2rem 0 .3rem; font-size: 1.02rem; }
.sandbox { border-left: 4px solid var(--brand); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.steps { padding-left: 1.2rem; } .steps li { margin: .4rem 0; }
code { background: #eef1f8; border: 1px solid var(--line); border-radius: 6px;
  padding: .08rem .35rem; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: .88em; }
.muted { color: var(--muted); } .small { font-size: .86rem; }
.changelog { list-style: none; padding: 0; } .changelog li { margin: .5rem 0; }
.tag { display: inline-block; font-size: .72rem; text-transform: uppercase; letter-spacing: .04em;
  background: #e7f0ff; color: var(--brand-ink); border-radius: 5px; padding: .1rem .4rem; margin-right: .5rem; }
.tag.warn { background: #fdeede; color: var(--warn); }

.footer { background: var(--bg); color: #aab3c8; padding: 1.6rem 0; }
.footer a { color: #9fc3ff; }

@media (max-width: 680px) {
  .grid2 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 1.8rem; }
  .topbar nav { display: none; }
}