DNA Helix
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Create an HTML+CSS+SVG animated "DNA Helix" loading indicator. Inside a 200×200 SVG viewBox, draw a rotating <g class="nucleotide"> group spinning around a center point (transform-origin: center, 3s linear infinite rotation, 360°). Inside the group, draw two interweaving "spine" curves using SVG <path> with cubic Bezier control points that cross at regular y-intervals (e.g. M 60 20 Q 100 50 140 20 Q 100 80 60 80 …) to simulate a helix from the top. Place 6 horizontal "base pair" rungs at vertical positions y=20, 50, 80, 110, 140, 170. Each pair is a horizontal line connecting two small circles (one on each spine), with each pair colored from a different palette accent (magenta/yellow/mint/violet/sky alternating). Use stroke-dasharray: 2 3 on the rung lines for a stippled, scientific look. Add a small monospace label below ("SEQUENCING · 0.42") in dim grey. Background: dark, with subtle glass-card container.