:root{color-scheme:dark;--bg0:#0b0c0b;--bg1:#151613;--panel:rgba(242,239,231,0.035);--panel-border:rgba(242,239,231,0.12);--text:#f2efe7;--muted:#b8b1a3;--accent:#d7b56d;--accent-2:#f0cf7f;--button-text:#0a0a10}*{box-sizing:border-box}body{margin:0;min-height:100vh;font-family:"Segoe UI","Inter",system-ui,sans-serif;color:var(--text);background:var(--bg0)}.shell{max-width:980px;margin:0 auto;padding:32px 20px 56px}.topbar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;margin-bottom:28px}.brand{display:flex;align-items:center;gap:10px;font-weight:700;letter-spacing:0}.brand-dot{width:10px;height:10px;border-radius:2px;background:var(--accent)}.brand-lign{color:#a8cbe6}nav{display:flex;flex-wrap:wrap;gap:10px}.nav-link{padding:8px 12px;border-radius:4px;color:var(--muted);text-decoration:none;border:1px solid transparent}.nav-link:hover,.nav-link.active{color:var(--text);border-color:rgba(242,239,231,0.18);background:rgba(242,239,231,0.045)}.hero{margin-bottom:22px}.eyebrow{margin:0 0 10px;color:var(--accent);text-transform:uppercase;letter-spacing:0.12em;font-size:0.82rem;font-weight:700}h1{margin:0 0 12px;font-size:clamp(2rem,5vw,3.2rem);line-height:1.02}.summary{max-width:760px;margin:0;color:var(--muted);font-size:1.02rem;line-height:1.65}.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}.card{padding:18px 18px 16px;border-radius:6px;background:var(--panel);border:1px solid var(--panel-border);box-shadow:none}.card h2{margin:0 0 10px;font-size:1rem}.card p{margin:0 0 10px;color:var(--muted);line-height:1.6}.card ul{margin:0;padding-left:18px;color:var(--text);line-height:1.55}.card li+li{margin-top:8px}.snippet{margin-top:12px;padding:14px 16px;border-radius:4px;background:rgba(242,239,231,0.035);border:1px solid var(--panel-border);color:var(--text);line-height:1.65;white-space:pre-wrap}a{color:var(--accent)}footer{margin-top:28px;padding-top:16px;border-top:1px solid var(--panel-border);color:var(--muted);line-height:1.6}.accent{color:var(--accent-2)}.topbar-actions{display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:12px;margin-left:auto}.site-auth{position:relative;z-index:50;color:var(--text,#f2efe7);font:0.92rem/1.35 "Segoe UI","Inter",system-ui,sans-serif}.site-auth.is-floating{position:fixed;top:14px;right:14px;z-index:1200;color:#f2efe7}.site-auth[hidden]{display:none !important}.site-auth-trigger{display:inline-flex;align-items:center;gap:8px;min-height:38px;padding:8px 12px;border:1px solid var(--panel-border,rgba(242,239,231,0.18));border-radius:4px;color:inherit;background:rgba(16,17,15,0.72);box-shadow:none;cursor:pointer;user-select:none;list-style:none}.site-auth-trigger::-webkit-details-marker{display:none}.site-auth-avatar{width:10px;height:10px;border-radius:2px;background:var(--muted,#94a3b8);box-shadow:0 0 0 3px rgba(242,239,231,0.08)}.site-auth.is-signed-in .site-auth-avatar{background:#22c55e;box-shadow:0 0 0 3px rgba(34,197,94,0.2)}.site-auth-panel{position:absolute;top:calc(100%+10px);right:0;display:grid;gap:12px;width:min(340px,calc(100vw - 28px));padding:14px;border:1px solid rgba(148,163,184,0.28);border-radius:4px;color:#0f172a;background:rgba(255,255,255,0.98);box-shadow:0 22px 60px rgba(15,23,42,0.22)}.site-auth:not([open]) .site-auth-panel{display:none}.site-auth-copy,.site-auth-user{color:#475569;font-size:0.88rem;line-height:1.45}.site-auth-user{color:#0f172a;font-weight:760}.site-auth-copy.error{color:#b91c1c}.site-auth-copy.success{color:#047857}.site-auth-form{display:grid;gap:10px;min-inline-size:0;margin:0;padding:0;border:0}.site-auth-form label{display:grid;gap:5px;color:#1e293b;font-size:0.86rem;font-weight:700}.site-auth-form input{min-height:40px;width:100%;border:1px solid #cbd5e1;border-radius:4px;padding:8px 10px;color:#0f172a;background:#ffffff;font:inherit;font-weight:500}.site-auth-actions,.site-auth-session-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.site-auth-actions button,.site-auth-session-actions button{min-height:40px;border:1px solid #cbd5e1;border-radius:4px;padding:8px 10px;color:#0f172a;background:#ffffff;font:inherit;font-weight:760;cursor:pointer}.site-auth-actions button:first-child{border-color:var(--accent,#d7b56d);color:#0a0a10;background:var(--accent,#d7b56d)}.site-auth-actions button:disabled,.site-auth-session-actions button:disabled{cursor:wait;opacity:0.66}@media (max-width:760px){.topbar-actions{width:100%;justify-content:space-between}.site-auth{margin-left:auto}.site-auth.is-floating{top:10px;right:10px}body.stem-trainer-public .site-auth.is-floating{top:112px;right:12px}}.hero-card{display:grid;gap:18px}.hero-copy{display:grid;gap:12px}.hero-copy p,.hero-copy ul{margin:0}.hero-copy ul{padding-left:1.2rem}.hero-actions{display:flex;flex-wrap:wrap;gap:12px}.hero-button{display:inline-flex;align-items:center;justify-content:center;min-height:52px;padding:0 20px;border-radius:14px;background:linear-gradient(135deg,var(--accent),#dff8ff);color:#04101d;font-weight:700;text-decoration:none}.hero-button.secondary{background:rgba(255,255,255,0.06);color:var(--text);border:1px solid rgba(255,255,255,0.1)}.hero-stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:12px}.hero-stat{border-radius:16px;border:1px solid rgba(255,255,255,0.08);background:rgba(255,255,255,0.04);padding:16px}.hero-stat strong{display:block;font-size:1.5rem;margin-bottom:6px}.hero-note{color:var(--muted);font-size:0.95rem}