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640px){.container{padding:1.5rem}h1{font-size:1.5rem}.results-header{flex-direction:column;align-items:stretch}.button-group{flex-direction:column}.download-button,.reset-button{width:100%}.progress-stepper{padding:1rem}.step-icon{width:32px;height:32px;font-size:.875rem}.step-label{font-size:.625rem}.step-line{min-width:15px;max-width:30px}}:root{--primary-color: #2563eb;--primary-hover: #1d4ed8;--danger-color: #dc2626;--border-color: #e5e7eb;--text-color: #1f2937;--text-muted: #6b7280;--bg-color: #ffffff;--bg-secondary: #f9fafb}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg-secondary);color:var(--text-color);line-height:1.6}#root{min-height:100vh}