:root{
  --bg:#07111f;--line:rgba(255,255,255,.12);--text:#f4f8ff;--muted:#b8c5d8;
  --blue:#5baeff;--green:#69d98e;--purple:#b992ff;--orange:#ffba70;--pink:#ff8ccc;
}
*{box-sizing:border-box}
body{margin:0;min-height:100vh;padding:22px;color:var(--text);font-family:Inter,Arial,Helvetica,sans-serif;
  background:radial-gradient(circle at top,#173253 0%,var(--bg) 56%)}
.wrap{width:min(900px,96vw);margin:0 auto}
a.back{color:var(--muted);text-decoration:none;font-size:13px}
a.back:hover{color:var(--blue)}
.topbar{margin:8px 0 18px;padding:18px 22px;border:1px solid rgba(255,255,255,.14);border-radius:20px;
  background:linear-gradient(180deg,rgba(255,255,255,.04),rgba(255,255,255,.01))}
.crumb{font-size:12px;font-weight:900;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-bottom:6px}
.topbar h1{margin:0;font-size:24px;letter-spacing:-.4px;line-height:1.2}
.topbar p{margin:7px 0 0;color:var(--muted);font-size:13px}
.panel{border:1px solid rgba(255,255,255,.10);border-radius:20px;padding:22px 24px;margin-bottom:18px;
  background:linear-gradient(180deg,rgba(255,255,255,.038),rgba(255,255,255,.014))}
.panel h2{margin:0 0 14px;font-size:20px;color:#dcebff;display:flex;align-items:center;gap:10px}
.panel h2 .dot{width:9px;height:9px;border-radius:50%;background:var(--blue);box-shadow:0 0 10px var(--blue)}
.panel>p{line-height:1.6;color:var(--muted);font-size:14px;margin:0 0 12px}
h3{font-size:16px;margin:18px 0 8px}
.notes p,.notes ul,.notes ol{line-height:1.7;color:#e7eefb;font-size:15px}
.notes p{margin:0 0 12px}
.notes ul,.notes ol{margin:0 0 12px;padding-left:22px}
.notes li{margin-bottom:5px}
.resource-links{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}
.resource-link{display:inline-flex;align-items:center;gap:7px;padding:10px 13px;border-radius:11px;text-decoration:none;font-weight:800;font-size:13px;color:#f7f1ff;background:rgba(185,146,255,.14);border:1px solid rgba(185,146,255,.34)}
.resource-link:hover{background:rgba(185,146,255,.22);transform:translateY(-1px)}
code{background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.10);border-radius:6px;padding:1px 6px;font-size:14px;font-family:'DejaVu Sans Mono',Consolas,monospace}
.callout{border-radius:12px;padding:13px 15px;margin:0 0 14px;background:rgba(91,174,255,.10);border:1px solid rgba(91,174,255,.28);line-height:1.6;font-size:14.5px}
table{width:100%;border-collapse:collapse;margin:6px 0 14px;font-size:14px}
th,td{border:1px solid rgba(255,255,255,.12);padding:9px 11px;text-align:left;line-height:1.5}
th{background:rgba(91,174,255,.12);color:#dcebff;font-size:13px}
.example{border-radius:14px;padding:16px;margin:14px 0;background:rgba(91,174,255,.08);border:1px solid rgba(91,174,255,.22)}
.ex-head{font-size:12px;text-transform:uppercase;letter-spacing:.09em;font-weight:900;color:var(--blue);margin-bottom:8px}
.ex-prompt{font-weight:700;line-height:1.5;margin-bottom:10px}
.ex-steps{margin:0 0 10px 18px;padding:0;color:#eaf1ff;line-height:1.7;font-size:14px}
.ex-steps li{margin-bottom:5px}
.ex-answer{border-radius:10px;padding:10px 12px;background:rgba(105,217,142,.12);border:1px solid rgba(105,217,142,.3);color:#eafff0;font-size:14px;line-height:1.5}
.qz{border-radius:13px;padding:14px 16px;margin-bottom:12px;background:rgba(255,255,255,.03);border:1px solid rgba(255,255,255,.08)}
.qz .q{font-weight:700;line-height:1.5}
.qz button{margin-top:10px;border:1px solid rgba(255,255,255,.16);background:rgba(255,255,255,.05);color:var(--text);
  padding:8px 13px;border-radius:10px;cursor:pointer;font-weight:700;font-size:13px}
.qz button:hover{background:rgba(255,255,255,.09)}
.qz .a{display:none;margin-top:10px;border-radius:10px;padding:10px 12px;background:rgba(105,217,142,.10);
  border:1px solid rgba(105,217,142,.3);color:#eafff0;font-size:14px;line-height:1.55}
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.card{border-radius:14px;padding:16px;min-height:96px;cursor:pointer;display:flex;align-items:center;justify-content:center;
  text-align:center;line-height:1.5;font-size:14px;background:rgba(185,146,255,.10);border:1px solid rgba(185,146,255,.28);transition:.14s ease}
.card:hover{background:rgba(185,146,255,.16)}
.card .lbl{font-size:11px;text-transform:uppercase;letter-spacing:.08em;font-weight:900;color:var(--purple);display:block;margin-bottom:6px}
.card.flipped{background:rgba(105,217,142,.10);border-color:rgba(105,217,142,.3)}
.card.flipped .lbl{color:var(--green)}
.nav{display:flex;justify-content:space-between;gap:10px;margin:6px 0 20px}
.nav a,.nav span{padding:11px 16px;border-radius:12px;font-weight:700;font-size:14px;text-decoration:none;line-height:1.3}
.nav a{background:linear-gradient(135deg,rgba(91,174,255,.95),rgba(29,135,255,.95));color:#03142b}
.nav span{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);color:var(--muted)}
.footer{color:var(--muted);font-size:12px;text-align:center;margin-top:8px;line-height:1.6}
@media (max-width:680px){.cards{grid-template-columns:1fr}}