*{margin:0;padding:0;box-sizing:border-box}body{font-family:Segoe UI,Tahoma,Geneva,Verdana,sans-serif;background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding:20px;line-height:1.6}.container{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr 400px;gap:30px;align-items:start}.header{background:linear-gradient(135deg,#2c3e50,#34495e);color:#fff;padding:30px;text-align:center;border-radius:15px 15px 0 0;grid-column:1 / -1}.header h1{font-size:2.5rem;margin-bottom:10px;font-weight:700}.header p{opacity:.9;font-size:1.1rem}.checkout-container{display:grid;grid-template-columns:1fr 400px;gap:30px;background:#fff;border-radius:15px;box-shadow:0 15px 35px #0000001a;overflow:hidden;grid-column:1 / -1}.form-section{padding:40px}.section-title{font-size:1.5rem;color:#2c3e50;margin-bottom:25px;padding-bottom:15px;border-bottom:2px solid 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