:root{--primary: #0f2b46;--primary-light: #1a4971;--secondary: #0891b2;--accent: #06b6d4;--bg: #f0f5fa;--card: #ffffff;--text: #1e293b;--text-light: #64748b;--border: #e2e8f0;--shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 4px 12px rgba(0, 0, 0, .04);--shadow-lg: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 10px 30px -5px rgba(0, 0, 0, .1);--shadow-hover: 0 8px 25px -5px rgba(0, 0, 0, .12);--radius: 16px;--radius-sm: 12px;--ease: cubic-bezier(.4, 0, .2, 1);--c-brain: #6366f1;--c-brain-bg: rgba(99, 102, 241, .06);--c-pathway: #0d9488;--c-pathway-bg: rgba(13, 148, 136, .06);--c-voice: #d97706;--c-voice-bg: rgba(217, 119, 6, .06);--c-engine: #dc2626;--c-engine-bg: rgba(220, 38, 38, .06);--c-touch: #059669;--c-touch-bg: rgba(5, 150, 105, .06);--c-foundation: #2563eb;--c-foundation-bg: rgba(37, 99, 235, .06)}html.dark{--primary: #38bdf8;--primary-light: #0ea5e9;--secondary: #22d3ee;--accent: #67e8f9;--bg: #0f172a;--card: #1e293b;--text: #ffffff;--text-light: #cbd5e1;--border: #334155;--shadow: 0 1px 3px rgba(0, 0, 0, .3), 0 4px 12px rgba(0, 0, 0, .3);--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, .4), 0 4px 6px -2px rgba(0, 0, 0, .2);--shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, .4), 0 10px 10px -5px rgba(0, 0, 0, .2);--c-brain: #818cf8;--c-brain-bg: rgba(129, 140, 248, .15);--c-pathway: #2dd4bf;--c-pathway-bg: rgba(45, 212, 191, .15);--c-voice: #fbbf24;--c-voice-bg: rgba(251, 191, 36, .15);--c-engine: #f87171;--c-engine-bg: rgba(248, 113, 113, .15);--c-touch: #34d399;--c-touch-bg: rgba(52, 211, 153, .15);--c-foundation: #60a5fa;--c-foundation-bg: rgba(96, 165, 250, .15)}html.dark header{background:linear-gradient(135deg,#020617,#0f172a,#1e293b);border-bottom:1px solid rgba(255,255,255,.05)}html.dark .concept-hero{background:linear-gradient(135deg,#020617,#0f172a,#1e293b)}html.dark .l0-hero{background:#ffffff08}html.dark .pv-card{border:1px solid var(--border)}html.dark 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var(--ease);-webkit-user-select:none;user-select:none;font-weight:500;color:var(--text-light);height:fit-content}.concept-btn:hover{border-color:var(--c-brain);color:var(--c-brain)}.concept-btn.active{background:#6366f11f;border-color:var(--c-brain);color:var(--c-brain)}.concept-btn-formula{font-family:Georgia,Times New Roman,serif;font-size:14px;letter-spacing:.5px}.concept-btn-formula em{font-style:italic;font-weight:700}.concept-btn-formula em:first-child{color:var(--c-brain)}.concept-btn-formula em:last-child{color:var(--c-engine)}.concept-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:#0f172a99;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .35s 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