*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

        :root {
            --bg-deep: #0a0a12;
            --bg-surface: #0f0f1e;
            --cyan: #00e5ff;
            --purple: #b388ff;
            --violet: #7c4dff;
            --magenta: #e040fb;
            --text: #e0e0e8;
            --text-dim: #8a8aa0;
        }

        html { scroll-behavior: smooth; }

        body {
            font-family: 'Rajdhani', sans-serif;
            background: var(--bg-deep);
            color: var(--text);
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* ── Neural Network Background ── */
        .neural-bg {
            position: fixed;
            inset: 0;
            z-index: 0;
            overflow: hidden;
            pointer-events: none;
        }

        .neural-bg canvas {
            width: 100%;
            height: 100%;
        }

        /* ── Navbar ── */
        nav {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 100;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 2rem;
            height: 64px;
            background: rgba(10, 10, 18, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(0, 229, 255, 0.1);
        }

        .nav-brand {
            font-family: 'Orbitron', sans-serif;
            font-weight: 900;
            font-size: 1.3rem;
            letter-spacing: 0.15em;
            background: linear-gradient(135deg, var(--cyan), var(--purple));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-decoration: none;
        }

        .nav-links {
            display: flex;
            gap: 0.5rem;
            list-style: none;
        }

        .nav-links a {
            font-family: 'Rajdhani', sans-serif;
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--text-dim);
            text-decoration: none;
            padding: 0.5rem 1rem;
            border-radius: 4px;
            transition: color 0.2s, background 0.2s, box-shadow 0.2s;
        }

        .nav-links a:hover,
        .nav-links a.active {
            color: var(--cyan);
            background: rgba(0, 229, 255, 0.06);
            box-shadow: inset 0 0 0 1px rgba(0, 229, 255, 0.15);
        }

        /* ── Hero Section ── */
        .hero {
            position: relative;
            z-index: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            padding: 6rem 2rem 4rem;
            text-align: center;
        }

        /* Clickable brain orb link */
        .brain-orb-link {
            display: block;
            text-decoration: none;
            cursor: pointer;
            outline: none;
        }

        /* Glowing brain orb */
        .brain-orb {
            position: relative;
            width: 220px;
            height: 220px;
            margin-bottom: 3rem;
        }

        .brain-orb .core {
            position: absolute;
            inset: 0;
            border-radius: 50%;
            background: radial-gradient(circle at 40% 35%, rgba(124, 77, 255, 0.5), rgba(0, 229, 255, 0.15) 60%, transparent 72%);
            animation: pulse-core 4s ease-in-out infinite;
        }

        .brain-orb .ring {
            position: absolute;
            inset: -20px;
            border-radius: 50%;
            border: 1px solid rgba(0, 229, 255, 0.2);
            animation: spin-ring 20s linear infinite;
        }

        .brain-orb .ring::before {
            content: '';
            position: absolute;
            top: -3px;
            left: 50%;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--cyan);
            box-shadow: 0 0 12px var(--cyan), 0 0 30px rgba(0, 229, 255, 0.4);
        }

        .brain-orb .ring-2 {
            inset: -45px;
            border-color: rgba(179, 136, 255, 0.15);
            animation-duration: 30s;
            animation-direction: reverse;
        }

        .brain-orb .ring-2::before {
            background: var(--purple);
            box-shadow: 0 0 12px var(--purple), 0 0 30px rgba(179, 136, 255, 0.4);
        }

        .brain-orb .ring-3 {
            inset: -70px;
            border-color: rgba(224, 64, 251, 0.1);
            animation-duration: 45s;
        }

        .brain-orb .ring-3::before {
            background: var(--magenta);
            box-shadow: 0 0 10px var(--magenta), 0 0 24px rgba(224, 64, 251, 0.3);
        }

        @keyframes pulse-core {
            0%, 100% { transform: scale(1); opacity: 0.8; }
            50% { transform: scale(1.06); opacity: 1; }
        }

        @keyframes spin-ring {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .hero h1 {
            font-family: 'Orbitron', sans-serif;
            font-weight: 900;
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            letter-spacing: 0.12em;
            line-height: 1.2;
            margin-bottom: 1rem;
            background: linear-gradient(135deg, var(--cyan) 0%, var(--purple) 50%, var(--magenta) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            filter: drop-shadow(0 0 30px rgba(0, 229, 255, 0.25));
        }

        .hero p {
            font-size: 1.25rem;
            font-weight: 300;
            color: var(--text-dim);
            max-width: 540px;
            line-height: 1.7;
            letter-spacing: 0.04em;
        }

        /* ── Section ── */
        .section {
            position: relative;
            z-index: 1;
            max-width: 960px;
            margin: 0 auto;
            padding: 4rem 2rem 6rem;
        }

        .section h2 {
            font-family: 'Orbitron', sans-serif;
            font-weight: 700;
            font-size: 1.5rem;
            letter-spacing: 0.1em;
            margin-bottom: 1.5rem;
            color: var(--cyan);
        }

        .section p {
            font-size: 1.1rem;
            line-height: 1.8;
            color: var(--text-dim);
            max-width: 700px;
        }

        /* ── Cards Grid ── */
        .cards {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.5rem;
            margin-top: 2rem;
        }

        .card {
            display: block;
            background: rgba(15, 15, 30, 0.7);
            border: 1px solid rgba(0, 229, 255, 0.08);
            border-radius: 8px;
            padding: 2rem 1.5rem;
            text-decoration: none;
            color: inherit;
            transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
        }

        .card:hover {
            border-color: rgba(0, 229, 255, 0.2);
            box-shadow: 0 0 30px rgba(0, 229, 255, 0.06), inset 0 0 30px rgba(0, 229, 255, 0.02);
            transform: translateY(-2px);
        }

        .card h3 {
            font-family: 'Orbitron', sans-serif;
            font-weight: 700;
            font-size: 1rem;
            letter-spacing: 0.08em;
            color: var(--purple);
            margin-bottom: 0.75rem;
        }

        .card p {
            font-size: 0.95rem;
            line-height: 1.7;
            color: var(--text-dim);
        }

        /* ── Footer ── */
        footer {
            position: relative;
            z-index: 1;
            text-align: center;
            padding: 2rem;
            border-top: 1px solid rgba(0, 229, 255, 0.06);
            font-size: 0.85rem;
            color: var(--text-dim);
        }

        /* ── Scanline overlay ── */
        body::after {
            content: '';
            position: fixed;
            inset: 0;
            z-index: 999;
            pointer-events: none;
            background: repeating-linear-gradient(
                0deg,
                transparent,
                transparent 2px,
                rgba(0, 0, 0, 0.03) 2px,
                rgba(0, 0, 0, 0.03) 4px
            );
        }

        /* ── Mobile Nav Toggle (Hamburger) ── */
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 0.4rem;
            z-index: 200;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--cyan);
            border-radius: 2px;
            transition: transform 0.3s, opacity 0.3s;
        }

        .nav-toggle.active span:nth-child(1) {
            transform: translateY(7px) rotate(45deg);
        }

        .nav-toggle.active span:nth-child(2) {
            opacity: 0;
        }

        .nav-toggle.active span:nth-child(3) {
            transform: translateY(-7px) rotate(-45deg);
        }

        /* ── Responsive ── */
        @media (max-width: 850px) {
            nav { padding: 0 1rem; }
            .nav-brand { font-size: 1rem; }

            .nav-toggle {
                display: flex;
            }

            .nav-links {
                position: fixed;
                top: 64px;
                left: 0;
                right: 0;
                flex-direction: column;
                background: rgba(10, 10, 18, 0.97);
                backdrop-filter: blur(16px);
                border-bottom: 1px solid rgba(0, 229, 255, 0.1);
                gap: 0;
                padding: 0;
                max-height: 0;
                overflow: hidden;
                transition: max-height 0.35s ease;
            }

            .nav-links.open {
                max-height: 320px;
            }

            .nav-links li {
                width: 100%;
            }

            .nav-links a {
                display: block;
                padding: 0.9rem 1.5rem;
                font-size: 1rem;
                border-bottom: 1px solid rgba(255, 255, 255, 0.04);
                border-radius: 0;
            }

            .nav-links a:hover {
                background: rgba(0, 229, 255, 0.08);
            }

            .brain-orb { width: 160px; height: 160px; margin-bottom: 2rem; }
        }