.research-aurora {
            background:
                radial-gradient(circle at 14% 18%, rgba(14, 165, 233, 0.16), transparent 28%),
                radial-gradient(circle at 76% 22%, rgba(239, 13, 51, 0.16), transparent 26%),
                linear-gradient(180deg, #050505 0%, #071116 45%, #050505 100%);
        }

        .research-card,
        .method-card,
        .signal-card,
        .cta-card {
            border: 1px solid rgba(255, 255, 255, 0.08);
            background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.02));
            backdrop-filter: blur(16px);
        }

        .research-card,
        .method-card {
            transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
        }

        .research-card:hover,
        .method-card:hover {
            transform: translateY(-8px);
            border-color: rgba(239, 13, 51, 0.25);
            box-shadow: 0 30px 80px -30px rgba(0, 0, 0, 0.8);
        }

        .stream-line {
            position: relative;
            padding-left: 4rem;
        }

        .stream-line::before {
            content: "";
            position: absolute;
            left: 1.4rem;
            top: 3rem;
            bottom: -1.75rem;
            width: 1px;
            background: linear-gradient(180deg, rgba(239, 13, 51, 0.48), rgba(255, 255, 255, 0.06));
        }

        .stream-line:last-child::before {
            display: none;
        }

        .stream-index {
            position: absolute;
            left: 0;
            top: 0;
            width: 2.8rem;
            height: 2.8rem;
            border-radius: 9999px;
            border: 1px solid rgba(255, 255, 255, 0.12);
            background: rgba(255, 255, 255, 0.04);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #ef0d33;
            font-size: 0.72rem;
            font-weight: 700;
            letter-spacing: 0.18em;
        }