:root {
                --quartz-grey: #F2F2F2;
                --warm-beige: #D6CFC7;
                --charcoal: #1A1A1A;
                --clinical-white: #FFFFFF;
                --glass-border: rgba(26, 26, 26, 0.08);
            }

            body {
                background-color: var(--quartz-grey);
                color: var(--charcoal);
                font-family: 'Inter', sans-serif;
                overflow-x: hidden;
            }

            .serif {
                font-family: 'Cormorant Garamond', serif;
            }

            /* Hero Canvas & Background */
            .clinical-void {
                position: relative;
                background: radial-gradient(circle at center, #FFFFFF 0%, var(--quartz-grey) 100%);
                overflow: hidden;
                min-height: 100vh;
                display: flex;
                align-items: center;
                justify-content: center;
            }

            /* Hex Compound Canvas */
            #hex-canvas {
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                pointer-events: none;
                opacity: 0.6;
            }

            .hero-content {
                position: relative;
                z-index: 20;
                text-align: center;
                max-width: 900px;
                padding: 0 20px;
            }

            /* Navigation Links */
            .nav-link {
                text-transform: uppercase;
                letter-spacing: 0.25em;
                font-size: 0.7rem;
                font-weight: 600;
                color: var(--charcoal);
                transition: all 0.3s ease;
            }

            .nav-link:hover {
                color: var(--warm-beige);
            }

            /* Buttons */
            .btn-primary {
                background-color: var(--charcoal);
                color: white;
                padding: 1.25rem 3rem;
                text-transform: uppercase;
                letter-spacing: 0.2em;
                font-size: 0.65rem;
                font-weight: 700;
                transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
                border: 1px solid var(--charcoal);
            }

            .btn-primary:hover {
                background-color: transparent;
                color: var(--charcoal);
                transform: translateY(-2px);
            }

            .btn-secondary {
                border: 1px solid var(--glass-border);
                padding: 1.25rem 3rem;
                text-transform: uppercase;
                letter-spacing: 0.2em;
                font-size: 0.65rem;
                font-weight: 700;
                transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
            }

            .btn-secondary:hover {
                background-color: white;
                transform: translateY(-2px);
            }

            /* Protocol Grid & Cards */
            .protocol-card {
                background: white;
                border: 1px solid var(--glass-border);
                padding: 4rem 3rem;
                transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
                position: relative;
            }

            .protocol-card:hover {
                transform: translateY(-15px);
                box-shadow: 0 40px 80px rgba(0, 0, 0, 0.04);
            }

            .protocol-num {
                position: absolute;
                top: 2rem;
                right: 2rem;
                font-size: 0.6rem;
                letter-spacing: 0.3em;
                font-weight: 700;
                color: var(--warm-beige);
            }

            /* Animations */
            .reveal {
                opacity: 0;
                transform: translateY(30px);
                transition: all 1.2s cubic-bezier(0.16, 1, 0.3, 1);
            }

            .reveal.active {
                opacity: 1;
                transform: translateY(0);
            }

            .hex-container {
                perspective: 1000px;
                width: 280px;
                height: 323px;
                margin: 0 auto;
                cursor: pointer;
            }

            .hex-inner {
                position: relative;
                width: 100%;
                height: 100%;
                transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
                transform-style: preserve-3d;
            }

            /* Auto-flip class for reviews */
            .hex-container:hover .hex-inner,
            .hex-inner.auto-flip {
                transform: rotateY(180deg);
            }

            /* Honeycomb specific mobile fixes */
            .honeycomb-row-2 {
                margin-top: 1rem;
            }

            @media (min-width: 768px) {
                .honeycomb-row-2 {
                    margin-top: -85px;
                }
            }

            .hex-front,
            .hex-back {
                position: absolute;
                width: 100%;
                height: 100%;
                backface-visibility: hidden;
                clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
                display: flex;
                flex-direction: column;
                align-items: center;
                justify-content: center;
                padding: 2.5rem;
                text-align: center;
            }

            .hex-front {
                background-color: var(--charcoal);
                color: white;
            }

            .hex-back {
                background-color: var(--quartz-grey);
                color: var(--charcoal);
                transform: rotateY(180deg);
            }

            /* Form Inputs */
            .clinical-input {
                width: 100%;
                background: transparent;
                border: none;
                border-bottom: 1px solid rgba(26, 26, 26, 0.2);
                padding: 1rem 0;
                font-size: 0.75rem;
                text-transform: uppercase;
                letter-spacing: 0.1em;
                color: var(--charcoal);
                transition: border-color 0.3s ease;
            }

            .clinical-input:focus {
                outline: none;
                border-bottom-color: var(--charcoal);
            }

            /* Volume Toggle Flip Animations */
            .volume-flip-container {
                perspective: 1000px;
            }

            .volume-flip-inner {
                position: relative;
                width: 100%;
                height: 100%;
                transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
                transform-style: preserve-3d;
            }

            .volume-flip-inner.is-flipped {
                transform: rotateY(180deg);
            }

            .volume-flip-front,
            .volume-flip-back {
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                backface-visibility: hidden;
            }

            .volume-flip-back {
                transform: rotateY(180deg);
            }

            .vol-btn {
                color: #9ca3af;
                border-bottom: 1px solid transparent;
                transition: all 0.3s ease;
            }

            .vol-btn.active {
                color: var(--charcoal);
                border-bottom-color: var(--charcoal);
            }

            /* AI Consultant Terminal */
            .ai-terminal {
                background: rgba(26, 26, 26, 0.98);
                border: 1px solid rgba(255, 255, 255, 0.1);
                height: 450px;
                display: flex;
                flex-direction: column;
                box-shadow: 0 40px 80px rgba(0, 0, 0, 0.1);
            }

            .ai-messages {
                flex-grow: 1;
                overflow-y: auto;
                padding: 2rem;
                display: flex;
                flex-direction: column;
                gap: 1.5rem;
            }

            .ai-message {
                max-width: 85%;
                font-size: 0.75rem;
                line-height: 1.8;
                letter-spacing: 0.05em;
            }

            .ai-message.user {
                align-self: flex-end;
                background: white;
                color: var(--charcoal);
                padding: 1rem 1.5rem;
            }

            .ai-message.system {
                align-self: flex-start;
                background: transparent;
                color: #a1a1aa;
                border-left: 2px solid white;
                padding-left: 1.5rem;
            }

            .ai-message.typing-cursor::after {
                content: '▋';
                display: inline-block;
                margin-left: 0.25em;
                animation: blink-caret 1s step-end infinite;
            }

            @keyframes blink-caret {

                from,
                to {
                    opacity: 1;
                }

                50% {
                    opacity: 0;
                }
            }

            /* Cart Notification Toast */
            #cart-toast {
                position: fixed;
                bottom: -100px;
                right: 40px;
                background: var(--charcoal);
                color: white;
                padding: 1.25rem 2.5rem;
                text-transform: uppercase;
                letter-spacing: 0.2em;
                font-size: 0.65rem;
                font-weight: 700;
                z-index: 1000;
                transition: bottom 0.5s cubic-bezier(0.16, 1, 0.3, 1);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
                border-left: 2px solid var(--warm-beige);
            }

            #cart-toast.show {
                bottom: 40px;
            }

            ::-webkit-scrollbar {
                width: 4px;
            }

            ::-webkit-scrollbar-thumb {
                background: var(--charcoal);
            }