/* THE KEYSTONE TRANSITION */
.keystone-section {
    background-color: transparent; /* Removed black background to allow global void */
    padding: 120px 0 0; /* Reduced padding for smoother transition */
    text-align: center;
    position: relative;
    z-index: 10;
}

/* Void Glow - Cleansing Palette */
.keystone-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at center, rgba(138, 43, 226, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
    filter: blur(50px);
}

.keystone-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.keystone-title {
    font-family: 'Inter', sans-serif;
    font-size: clamp(48px, 6vw, 72px);
    font-weight: 700;
    color: #FFFFFF;
    line-height: 1.1;
    margin-bottom: 32px;
    letter-spacing: -0.03em;
}

.keystone-subtext {
    font-family: 'Inter', sans-serif;
    font-size: 20px;
    font-weight: 300;
    color: #B0B0B0; /* Premium Silver */
    line-height: 1.6;
    max-width: 640px;
    margin: 0 auto 60px;
}

.keystone-line {
    width: 1px;
    height: 160px;
    /* Smooth gradient thread */
    background: linear-gradient(to bottom, 
        rgba(0, 255, 204, 0), 
        rgba(0, 255, 204, 0.8) 20%, 
        rgba(138, 43, 226, 0.8) 50%,
        rgba(255, 69, 0, 0.8) 80%,
        transparent 100%
    );
    opacity: 1;
    position: relative;
    z-index: 20;
    margin-top: 20px;
}

/* Connecting Dot at the tip - REMOVED */
.keystone-line::after {
    display: none;
}

@keyframes pulseTip {
    0% { opacity: 0.5; transform: translateX(-50%) scale(1); }
    50% { opacity: 1; transform: translateX(-50%) scale(1.5); }
    100% { opacity: 0.5; transform: translateX(-50%) scale(1); }
}