:root{--bg-base: #090a0f;--bg-surface-1: #12151e;--bg-surface-2: #1c202d;--bg-surface-glass: rgba(22, 25, 34, .7);--line: rgba(255, 255, 255, .08);--line-light: rgba(255, 255, 255, .15);--text: #f3f4f6;--muted: #9ca3af;--accent: #3b82f6;--accent-glow: rgba(59, 130, 246, .25);--amber: #f59e0b;--green: #10b981;--red: #f43f5e;--easy-bg: rgba(16, 185, 129, .12);--med-bg: rgba(245, 158, 11, .12);--hard-bg: rgba(244, 63, 94, .12);font-family:Inter,Geist Sans,system-ui,sans-serif;color:var(--text);background:var(--bg-base);line-height:1.5}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(1200px 600px at 10% -10%,rgba(59,130,246,.05) 0%,transparent 55%),radial-gradient(900px 500px at 100% 0%,rgba(245,158,11,.03) 0%,transparent 50%),var(--bg-base)}a{color:var(--accent);text-decoration:none;transition:.2s}a:hover{color:#60a5fa}button,input,select{font:inherit;border-radius:8px;border:1px solid var(--line);background:var(--bg-surface-2);color:var(--text);padding:.6rem 1rem;transition:all .2s cubic-bezier(.4,0,.2,1)}button:hover:not(:disabled){background:#252a3a;border-color:var(--line-light)}button:active:not(:disabled){transform:scale(.98)}button:focus-visible,input:focus-visible,select:focus-visible{outline:2px solid var(--accent);outline-offset:2px}button{cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:.5rem}button.primary{background:var(--text);color:var(--bg-base);border-color:transparent;font-weight:600}button.primary:hover:not(:disabled){background:#fff;box-shadow:0 0 15px #ffffff26}button.primary:disabled{opacity:.5;cursor:not-allowed}.shell{display:grid;grid-template-columns:240px 1fr;min-height:100vh}.nav{border-right:1px solid var(--line);padding:1.5rem 1rem;background:var(--bg-base);display:flex;flex-direction:column;gap:.5rem}.nav .brand{font-weight:700;font-size:1.2rem;letter-spacing:.02em;margin-bottom:2rem;display:flex;align-items:center;gap:.5rem;padding-left:.5rem}.nav a{display:flex;align-items:center;gap:.75rem;color:var(--muted);padding:.6rem .75rem;border-radius:8px;text-decoration:none;font-size:.95rem;font-weight:500;transition:all .2s}.nav a.active,.nav a:hover{background:var(--bg-surface-2);color:var(--text)}.nav a.active{box-shadow:inset 2px 0 0 var(--accent)}.main{padding:2rem 3rem;max-width:1400px;margin:0 auto;width:100%}.row{display:flex;gap:1rem;flex-wrap:wrap;align-items:center}.grid{display:grid;gap:1.25rem}.grid.cols-3{grid-template-columns:repeat(3,1fr)}.mono{font-family:JetBrains Mono,IBM Plex Mono,ui-monospace,monospace}.muted{color:var(--muted)}.card{background:var(--bg-surface-glass);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:12px;padding:1.25rem 1.5rem;transition:transform .2s,box-shadow .2s}.card:hover{border-color:var(--line-light);box-shadow:0 4px 20px #0003}.card h2,.card h3{margin:0 0 .75rem;font-size:1.1rem;font-weight:600}.pill{display:inline-flex;align-items:center;font-size:.75rem;font-weight:600;padding:.2rem .6rem;border-radius:999px;border:1px solid var(--line);color:var(--muted);text-transform:uppercase;letter-spacing:.05em}.pill.ok{color:var(--green);border-color:#10b9814d;background:#10b9811a}.pill.bad{color:var(--red);border-color:#f43f5e4d;background:#f43f5e1a}.pill.Easy{color:var(--green);background:var(--easy-bg);border-color:#10b98133}.pill.Medium{color:var(--amber);background:var(--med-bg);border-color:#f59e0b33}.pill.Hard{color:var(--red);background:var(--hard-bg);border-color:#f43f5e33}.split{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;height:calc(100vh - 120px)}.panel{background:var(--bg-surface-1);border:1px solid var(--line);border-radius:12px;padding:1.5rem;overflow:auto;box-shadow:inset 0 2px 10px #0003}.md{font-size:.95rem;line-height:1.6}.md h1{font-size:1.8rem;border-bottom:1px solid var(--line);padding-bottom:.5rem;margin-top:0}.md h2{font-size:1.4rem;color:#e5e7eb;margin-top:1.5rem}.md h3{font-size:1.1rem;color:#d1d5db}.md code{background:var(--bg-surface-2);padding:.2rem .4rem;border-radius:4px;font-family:monospace;font-size:.85em}.md pre code{background:transparent;padding:0}.md blockquote{border-left:4px solid var(--accent);padding-left:1rem;color:var(--muted);background:var(--bg-surface-2);padding:.5rem 1rem;border-radius:0 8px 8px 0;margin-left:0}@media(max-width:1024px){.shell{grid-template-columns:1fr}.nav{border-right:0;border-bottom:1px solid var(--line);padding:1rem;flex-direction:row;flex-wrap:wrap;justify-content:center}.nav .brand{margin:0;padding-right:1rem;border-right:1px solid var(--line)}.split,.grid.cols-3{grid-template-columns:1fr;height:auto}.panel{max-height:70vh}}