:root{--bg:#f5f7fb;--surface:#fff;--text:#172033;--muted:#667085;--line:#e4e7ec;--primary:#1956d1;--primary-dark:#123c9a;--danger:#b42318;--success:#027a48;--soft:#eef4ff;--shadow:0 12px 30px rgba(16,24,40,.07)}*{box-sizing:border-box}body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}.container{max-width:1180px;margin:0 auto;padding:0 24px}.topbar{background:#0e172a;color:#fff;position:sticky;top:0;z-index:10}.topbar-inner{min-height:68px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{font-weight:800}.topbar nav{display:flex;gap:16px;font-size:14px}.topbar nav a{opacity:.8}.topbar nav a:hover{opacity:1}.page{padding-top:34px;padding-bottom:50px}.hero,.page-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:24px;margin-bottom:28px}.hero{padding:28px;border:1px solid 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solid var(--line)}.response-block h3{padding:0 16px;margin:16px 0 8px}.response-block pre{margin:0 16px 16px;padding:14px;overflow:auto;background:#101828;color:#d1e9ff;border-radius:10px;font:12px/1.55 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap;word-break:break-word}.error-box{margin:12px 16px;padding:12px;border-radius:10px;background:#fff0f0;color:var(--danger)}.footer{border-top:1px solid var(--line);padding:20px 0;color:var(--muted);font-size:13px}.is-hidden{display:none}.challenge-body{background:#0b1020;min-height:100vh}.challenge-shell{max-width:1000px;margin:0 auto;padding:24px}.challenge-head{color:#fff;margin-bottom:18px}.challenge-head p{color:#b8c1d1}.challenge-frame{background:#fff;border-radius:14px;min-height:520px;padding:12px;display:block;overflow:hidden}.challenge-frame iframe{display:block;width:100%!important;min-width:0;max-width:100%;height:72vh;min-height:520px;border:0}@media(max-width:900px){.cards{grid-template-columns:1fr 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.field-help{font-size:12px;color:#667085;line-height:1.5}