:root{--bg: #06080c;--surface: #0d1117;--border: #1e2633;--text: #e8eaed;--muted: #7b7f8a;--accent: #4a9eff;--pass: #00e5a0;--warn: #f5a623;--challenge: #ff6b2b;--stop: #ff2d55;font-family:Space Grotesk,system-ui,sans-serif;color:var(--text);background:var(--bg)}*{box-sizing:border-box;margin:0;padding:0}body{min-height:100vh;background:radial-gradient(ellipse at 20% 0%,#0a1628 0%,var(--bg) 50%)}a{color:var(--accent);text-decoration:none}section{max-width:1100px;margin:0 auto;padding:4rem 1.5rem}h1,h2,h3{letter-spacing:-.02em}code,pre{font-family:JetBrains Mono,monospace}button{font-family:inherit;cursor:pointer;border:none;border-radius:8px;padding:.65rem 1.2rem;font-weight:600;transition:transform .15s,opacity .15s}button:hover:not(:disabled){transform:translateY(-1px)}button:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff}.btn-danger{background:var(--stop);color:#fff}.btn-ghost{background:transparent;border:1px solid var(--border);color:var(--text)}.card{background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:1.5rem}