@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--font:"Inter", system-ui, -apple-system, sans-serif;--bg-app:#f0f2f7;--bg-page:#fff;--bg-subtle:#f8f9fc;--bg-hover:#f1f4fa;--border:#e4e8f0;--border-strong:#d1d9e6;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--text-xmuted:#cbd5e1;--accent:#4f46e5;--accent-hover:#4338ca;--accent-light:#eef2ff;--accent-border:#c7d2fe;--accent-text:#4f46e5;--sidebar-bg:#18181f;--sidebar-text:#a1a1aa;--sidebar-hover:#ffffff0f;--sidebar-active-bg:#6366f126;--sidebar-active-text:#a5b4fc;--sidebar-border:#ffffff0f;--radius-sm:6px;--radius-md:10px;--radius-lg:14px;--radius-xl:18px;--shadow-sm:0 1px 3px #0f172a0f, 0 1px 2px #0f172a0a;--shadow-md:0 4px 16px #0f172a14, 0 2px 6px #0f172a0a;--shadow-lg:0 12px 32px #0f172a1a, 0 4px 12px 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var(--border);margin:0}.ndr-block-body{padding:14px 16px}.ndr-sidebar{border-left:1px solid var(--border);background:var(--bg-page);flex-direction:column;flex-shrink:0;gap:18px;width:252px;padding:20px 14px;display:flex;overflow-y:auto}.ndr-quiz-btn{background:var(--accent);color:#fff;border-radius:var(--radius-md);cursor:pointer;width:100%;font-size:13px;font-weight:600;font-family:var(--font);border:none;justify-content:center;align-items:center;gap:7px;padding:11px;transition:background .15s,box-shadow .15s;display:flex;box-shadow:0 1px 6px #4f46e54d}.ndr-quiz-btn:hover{background:var(--accent-hover);box-shadow:0 3px 12px #4f46e559}.ndr-sidebar-section{flex-direction:column;gap:8px;display:flex}.ndr-sidebar-title{color:var(--text-muted);text-transform:uppercase;letter-spacing:.07em;border-bottom:1px solid var(--border);padding-bottom:8px;font-size:10.5px;font-weight:700}.ndr-related-card{background:var(--bg-subtle);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;padding:11px 12px;transition:all .15s}.ndr-related-card:hover{border-color:var(--accent-border);background:var(--accent-light)}.ndr-related-title{color:var(--text-primary);text-overflow:ellipsis;white-space:nowrap;margin:0 0 3px;font-size:12px;font-weight:600;line-height:1.4;overflow:hidden}.ndr-related-meta{color:var(--text-muted);margin:0 0 6px;font-size:11px}.ndr-related-tags{flex-wrap:wrap;gap:3px;display:flex}.ndr-related-tag{color:var(--accent);background:#6366f114;border:1px solid #6366f126;border-radius:10px;padding:2px 6px;font-size:10px}.ndr-no-related{color:var(--text-xmuted);padding:4px 0;font-size:12px;font-style:italic}@media (width<=900px){.ndr-sidebar{display:none}}.ndr-concept-card{background:var(--bg-page);border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:0 var(--radius-lg) var(--radius-lg) 0;padding:18px 20px;transition:box-shadow .15s,border-color .15s}.ndr-concept-card:hover{box-shadow:var(--shadow-md)}.ndr-concept-name{text-transform:uppercase;letter-spacing:.07em;color:var(--accent);background:var(--accent-light);border-radius:20px;margin-bottom:12px;padding:2px 9px;font-size:10.5px;font-weight:700;display:inline-block}.ndr-concept-sources{flex-wrap:wrap;gap:5px;margin-bottom:14px;display:flex}.ndr-concept-source-pill{color:var(--text-muted);background:var(--bg-subtle);border:1px solid var(--border);border-radius:20px;padding:2px 8px;font-size:10px;font-style:italic}.ndr-concept-question{color:var(--text-primary);margin-bottom:12px;font-size:14px;font-weight:600;line-height:1.55}.ndr-concept-loading{color:var(--text-muted);align-items:center;gap:8px;padding:8px 0;font-size:13px;font-style:italic;display:flex}.ndr-connect-label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);align-items:center;gap:6px;margin-bottom:10px;font-size:10.5px;font-weight:700;display:flex}.ndr-connect-box{background:var(--bg-page);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-secondary);margin-bottom:8px;padding:13px 15px;font-size:13.5px;line-height:1.75}.ndr-info-card{border-radius:var(--radius-md);align-items:flex-start;gap:9px;margin-bottom:8px;padding:10px 13px;font-size:12px;line-height:1.6;display:flex}.ndr-info-card.gap{color:#7f1d1d;background:#fef2f2;border:1px solid #fecaca}.ndr-info-card.conn{color:#14532d;background:#f0fdf4;border:1px solid #bbf7d0}.ndr-info-card.misc{color:#78350f;background:#fffbeb;border:1px solid #fde68a}.ndr-info-card strong{font-weight:600}.ndr-teach-box{background:var(--accent-light);border:1px solid var(--accent-border);border-radius:var(--radius-md);margin-bottom:16px;padding:13px 15px}.ndr-teach-label{text-transform:uppercase;letter-spacing:.06em;color:var(--accent);margin-bottom:4px;font-size:10px;font-weight:700}.ndr-teach-prompt{color:#3730a3;margin-bottom:10px;font-size:13px;line-height:1.55}.ndr-cta-btn{background:var(--accent);color:#fff;border-radius:var(--radius-md);cursor:pointer;width:100%;font-size:13px;font-weight:600;font-family:var(--font);border:none;justify-content:center;align-items:center;gap:8px;margin-top:4px;padding:11px;transition:background .15s,opacity .15s;display:flex}.ndr-cta-btn:hover{background:var(--accent-hover)}.ndr-cta-btn.amber{background:#d4a017}.ndr-cta-btn.amber:hover{background:#b8860b}.ndr-cta-btn.green{background:#16a34a}.ndr-cta-btn.green:hover{background:#15803d}.ndr-strength-box{background:var(--bg-subtle);border:1px solid var(--border);border-radius:var(--radius-md);padding:13px}.ndr-strength-title{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:10px;font-size:10.5px;font-weight:700}.ndr-strength-levels{flex-direction:column;gap:6px;display:flex}.ndr-strength-level{border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--bg-page);color:var(--text-secondary);align-items:center;gap:8px;padding:7px 10px;font-size:12px;transition:all .15s;display:flex}.ndr-strength-level.active-low{color:#991b1b;background:#fef2f2;border-color:#fca5a5;font-weight:600}.ndr-strength-level.active-med{color:#92400e;background:#fffbeb;border-color:#fcd34d;font-weight:600}.ndr-strength-level.active-high{color:#166534;background:#f0fdf4;border-color:#86efac;font-weight:600}.ndr-strength-dot{border-radius:50%;flex-shrink:0;width:8px;height:8px}.ndr-strength-dot.low{background:#ef4444}.ndr-strength-dot.med{background:#f59e0b}.ndr-strength-dot.high{background:#22c55e}@keyframes spin{to{transform:rotate(360deg)}}.ndr-spinner{border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;flex-shrink:0;width:14px;height:14px;animation:.7s linear infinite spin}:root{--nd-border:var(--border);--nd-card-bg:var(--bg-page);--nd-text-muted:var(--text-muted)}@keyframes skeleton-pulse{0%,to{opacity:.4}50%{opacity:.7}}.ndr-skeleton-pulse{animation:1.5s ease-in-out infinite skeleton-pulse}