DNA Double Helix Structure

import matplotlib.pyplot as plt
import numpy as np

# DNA Double Helix
n = 200
t = np.linspace(0, 4 * np.pi, n)

# First strand
x1 = np.cos(t)
y1 = np.sin(t)
z1 = t / (4 * np.pi)

# Second strand (180° offset)
x2 = np.cos(t + np.pi)
y2 = np.sin(t + np.pi)
z2 = t / (4 * np.pi)

fig = plt.figure(figsize=(10, 8), facecolor='#0a0a0f')
ax = fig.add_subplot(111, projection='3d', facecolor='#0a0a0f')

# Plot both strands with glow effect
ax.plot(x1, y1, z1, color='#06b6d4', linewidth=3, alpha=0.3)
ax.plot(x1, y1, z1, color='#22d3ee', linewidth=1.5)
ax.plot(x2, y2, z2, color='#ec4899', linewidth=3, alpha=0.3)
ax.plot(x2, y2, z2, color='#f472b6', linewidth=1.5)

# Base pair connections
for i in range(0, n, 10):
    ax.plot([x1[i], x2[i]], [y1[i], y2[i]], [z1[i], z2[i]], 
            color='#334155', linewidth=0.8, alpha=0.6)

ax.set_xlim(-1.5, 1.5)
ax.set_ylim(-1.5, 1.5)
ax.set_zlim(0, 1)

# Style
ax.set_xlabel('X', color='white', fontsize=10)
ax.set_ylabel('Y', color='white', fontsize=10)
ax.set_zlabel('Z', color='white', fontsize=10)
ax.set_title('DNA Double Helix Structure', color='white', fontsize=14, fontweight='bold', pad=20)

ax.tick_params(colors='#64748b', labelsize=8)
ax.xaxis.pane.fill = False
ax.yaxis.pane.fill = False
ax.zaxis.pane.fill = False
ax.xaxis.pane.set_edgecolor('#1e293b')
ax.yaxis.pane.set_edgecolor('#1e293b')
ax.zaxis.pane.set_edgecolor('#1e293b')
ax.grid(True, alpha=0.2, color='#334155')

ax.view_init(elev=20, azim=45)
plt.tight_layout()
plt.show()