*{margin:0;padding:0;box-sizing:border-box}:root{--color-primary: #2c2c2c;--color-secondary: #5c5c5c;--color-accent: #4a90e2;--color-bg: #ffffff;--color-bg-alt: #f8f9fa;--color-text: #2c2c2c;--color-text-light: #6c757d;--color-success: #28a745;--color-error: #dc3545;--spacing-unit: 1rem;--max-width: 1200px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.6;color:var(--color-text);background-color:var(--color-bg-alt);overflow-x:hidden}.container{max-width:var(--max-width);margin:0 auto;padding:0 2rem}header{padding:1.5rem 0;background-color:var(--color-bg);border-bottom:1px solid #e5e5e5}.logo{font-size:1.5rem;font-weight:600;color:var(--color-primary);text-decoration:none;letter-spacing:-.02em}.checkout-main{min-height:calc(100vh - 200px);padding:3rem 0}.checkout-container{max-width:800px;margin:0 auto;background-color:var(--color-bg);padding:3rem;border-radius:12px;box-shadow:0 2px 8px 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.price-period{font-size:1rem;color:var(--color-text-light)}.billing-info{color:var(--color-text-light);font-size:.875rem}.checkout-form,.form-section{margin-bottom:2rem}.form-section h3{font-size:1.25rem;color:var(--color-primary);margin-bottom:1rem;padding-bottom:.5rem;border-bottom:2px solid var(--color-bg-alt)}.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.form-group{margin-bottom:1.5rem}.form-group label{display:block;margin-bottom:.5rem;color:var(--color-text);font-weight:500;font-size:.95rem}.form-group input,.form-group select{width:100%;padding:.75rem;border:2px solid #e5e5e5;border-radius:6px;font-size:1rem;font-family:inherit;transition:border-color .3s ease}.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--color-primary)}.form-group input.error,.form-group select.error{border-color:var(--color-error)}.form-group 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