*{margin:0;padding:0;box-sizing:border-box;font-family:Arial,sans-serif;color:#222;} body{background:#ffffff;} .container{max-width:1200px;margin:0 auto;padding:0 16px;} .hero-section{text-align:center;padding:45px 15px;} .hero-section h1{font-size:32px;margin-bottom:12px;} .hero-section .sub-title{font-size:18px;color:#545454;} .intro-block{background:#f6f8fa;border-radius:14px;padding:26px 24px;box-shadow:0 2px 6px rgba(0,0,0,0.08);margin-bottom:22px;} .intro-block h2{font-size:20px;display:flex;align-items:center;gap:10px;margin-bottom:12px;} .intro-block p{font-size:15px;line-height:1.75;color:#333;} .feature-grid{display:grid;grid-template-columns:1fr;gap:20px;margin-bottom:45px;} .feature-card{background:#ffffff;border:1px solid #e2e5e9;border-radius:14px;padding:24px;box-shadow:0 2px 6px rgba(0,0,0,0.05);} .feature-card h3{font-size:19px;display:flex;align-items:center;gap:10px;margin-bottom:10px;} .feature-card p{font-size:15px;line-height:1.75;color:#333;} @media(min-width:768px){.feature-grid{grid-template-columns:1fr 1fr;}} 🐱 No‑Drill Vertical Sash Window Cat Door Adjustable Aluminum Frame Pet Door Insert Fits 23.5‑37.5 Inch Window for Cats Up to 18 lbs 🪟 Stable Aluminum Frame & Good Daylight Solid aluminum frame keeps the insert firmly fixed inside the window track. Large clear‑view panel maintains indoor brightness, and honeycomb side panels bring modern‑looking without blocking your view. 🌬️ Magnetic Flap with Weather‑Proof Seals 🔒 4‑Way Access Control Settings 📏 Clear Size Guidelines for Selection Only works for vertical sash windows with track width under 0.79 in. Flap opening:7"W ×7.5"H, suitable for cats under 18 lbs. Not fit for horizontal sliding, crank or casement windows.