:root{--color-surface: #ffffff;--color-text-primary: #1f2937;--color-text-secondary: #6b7280;--color-border: #d1d5db;--color-primary: #3b82f6;--color-secondary: #6b7280;--color-error: #dc2626;--color-success: #059669;--color-warning: #d97706;--color-info: #0369a1;--color-disabled: #9ca3af;--color-text-on-primary: #ffffff;--color-text-on-secondary: #ffffff;--color-info-bg: #f0f9ff;--color-info-text: #0369a1;--color-error-bg: #fef2f2;--color-error-text: #991b1b;--color-success-bg: #f0fdf4;--color-success-text: #166534;--color-warning-bg: #fffbeb;--color-warning-text: #92400e}@media (prefers-color-scheme: dark){:root{--color-surface: #1f2937;--color-text-primary: #f9fafb;--color-text-secondary: #d1d5db;--color-border: #374151;--color-primary: #3b82f6;--color-secondary: #6b7280;--color-error: #ef4444;--color-success: #10b981;--color-warning: #f59e0b;--color-info: #0ea5e9;--color-disabled: #6b7280;--color-text-on-primary: #ffffff;--color-text-on-secondary: #ffffff;--color-info-bg: #1e3a8a;--color-info-text: #93c5fd;--color-error-bg: #7f1d1d;--color-error-text: #fca5a5;--color-success-bg: #14532d;--color-success-text: #86efac;--color-warning-bg: #78350f;--color-warning-text: #fcd34d}}.app{min-height:100vh;display:flex;flex-direction:column;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.app-header{padding:2rem;text-align:center;background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.2)}.logo h1{margin:0;font-size:2.5rem;font-weight:700;background:linear-gradient(45deg,#fff,#e0e7ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.logo p{margin:.5rem 0 0;font-size:1.1rem;opacity:.9}.app-main{flex:1;padding:2rem;max-width:1200px;margin:0 auto;width:100%}.hero-section{text-align:center;margin-bottom:3rem}.hero-section h2{font-size:2.5rem;margin-bottom:1rem;background:linear-gradient(45deg,#fff,#e0e7ff);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-section p{font-size:1.2rem;margin-bottom:2rem;opacity:.9;max-width:600px;margin-left:auto;margin-right:auto}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;margin-top:2rem}.feature-card{background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);border-radius:12px;padding:1.5rem;transition:all .3s ease}.feature-card:hover{transform:translateY(-5px);background:#ffffff26;box-shadow:0 10px 30px #0003}.feature-card h3{margin:0 0 .5rem;font-size:1.3rem;color:#e0e7ff}.feature-card p{margin:0;opacity:.8;line-height:1.6}.demo-section{background:#ffffff1a;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border:1px solid 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strong{color:var(--color-text-primary)}.app-footer{padding:1.5rem;text-align:center;background:#0003;border-top:1px solid rgba(255,255,255,.1)}.app-footer p{margin:0;opacity:.7;font-size:.9rem}@media (max-width: 768px){.app-header{padding:1rem}.logo h1{font-size:2rem}.app-main{padding:1rem}.hero-section h2{font-size:2rem}.feature-grid{grid-template-columns:1fr}.demo-button{margin:.25rem}}:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;--color-background: #ffffff;--color-surface: #f8fafc;--color-surface-elevated: #ffffff;--color-text-primary: #1e293b;--color-text-secondary: #64748b;--color-text-muted: #94a3b8;--color-border: #e2e8f0;--color-border-focus: #3b82f6;--color-input-background: #ffffff;--color-input-border: #d1d5db;--color-button-primary: #3b82f6;--color-button-primary-hover: #2563eb;--color-button-secondary: #f1f5f9;--color-button-secondary-hover: #e2e8f0;--color-button-text: #1e293b;--color-error: #ef4444;--color-error-background: #fef2f2;--color-success: #10b981;--color-warning: #f59e0b;--color-shadow: rgba(0, 0, 0, .1);--color-shadow-elevated: rgba(0, 0, 0, .15);color-scheme:light dark;color:var(--color-text-primary);background-color:var(--color-background);font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%}@media (prefers-color-scheme: dark){:root{--color-background: #0f172a;--color-surface: #1e293b;--color-surface-elevated: #334155;--color-text-primary: #f8fafc;--color-text-secondary: #cbd5e1;--color-text-muted: #64748b;--color-border: #334155;--color-border-focus: #60a5fa;--color-input-background: #1e293b;--color-input-border: #475569;--color-button-primary: #3b82f6;--color-button-primary-hover: #60a5fa;--color-button-secondary: #334155;--color-button-secondary-hover: #475569;--color-button-text: #f8fafc;--color-error: #f87171;--color-error-background: #450a0a;--color-success: #34d399;--color-warning: #fbbf24;--color-shadow: rgba(0, 0, 0, .3);--color-shadow-elevated: rgba(0, 0, 0, .4)}}a{font-weight:500;color:var(--color-button-primary);text-decoration:inherit;transition:color .2s ease}a:hover{color:var(--color-button-primary-hover)}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh;background-color:var(--color-background);color:var(--color-text-primary);transition:background-color .3s ease,color .3s ease}h1{font-size:3.2em;line-height:1.1;color:var(--color-text-primary)}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:var(--color-button-primary);color:#fff;cursor:pointer;transition:all .2s ease}button:hover{border-color:var(--color-button-primary-hover);background-color:var(--color-button-primary-hover)}button:focus,button:focus-visible{outline:2px solid 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ease}.form-input:focus,.form-select:focus{outline:none;border-color:var(--color-border-focus);box-shadow:0 0 0 3px #3b82f61a}.form-input::placeholder{color:var(--color-text-muted)}.form-helper,.form-error{display:block;margin-top:.25rem;font-size:.75rem;line-height:1rem}.form-helper{color:var(--color-text-muted)}.form-error{color:var(--color-error)}.btn-primary{background-color:var(--color-button-primary);color:#fff;border:1px solid var(--color-button-primary)}.btn-primary:hover{background-color:var(--color-button-primary-hover);border-color:var(--color-button-primary-hover)}.btn-secondary{background-color:var(--color-button-secondary);color:var(--color-button-text);border:1px solid var(--color-border)}.btn-secondary:hover{background-color:var(--color-button-secondary-hover);border-color:var(--color-border)}.form-grid{display:grid;gap:1rem}.form-grid-2{grid-template-columns:1fr 1fr}.form-grid-3{grid-template-columns:2fr 1fr 1fr}.form-section{margin-bottom:2rem;padding:1.5rem;background-color:var(--color-surface-elevated);border:1px solid var(--color-border);border-radius:8px}.form-section-title{font-size:1.25rem;font-weight:600;margin-bottom:1rem;color:var(--color-text-primary)}.error-display{padding:1rem;margin-bottom:1rem;background-color:var(--color-error-background);border:1px solid var(--color-error);border-radius:6px;color:var(--color-error)}.error-display h3{font-weight:600;margin-bottom:.5rem}.error-display ul{margin-left:1.5rem;margin-bottom:0}.status-available{color:var(--color-success);font-weight:500}.status-taken{color:var(--color-error);font-weight:500}.status-checking{color:var(--color-warning);font-style:italic}.text-primary{color:var(--color-text-primary)}.text-secondary{color:var(--color-text-secondary)}.text-muted{color:var(--color-text-muted)}.text-error{color:var(--color-error)}.text-success{color:var(--color-success)}.bg-surface{background-color:var(--color-surface)}.bg-surface-elevated{background-color:var(--color-surface-elevated)}.bg-error{background-color:var(--color-error-background)}.border-default{border-color:var(--color-border)}.border-focus{border-color:var(--color-border-focus)}.shadow-default{box-shadow:0 1px 3px var(--color-shadow)}.shadow-elevated{box-shadow:0 4px 6px var(--color-shadow-elevated)}*{transition:background-color .3s ease,color .3s ease,border-color .3s ease,box-shadow .3s ease}.signup-container{min-height:100vh;background-color:var(--color-surface);padding:2rem;display:flex;align-items:center;justify-content:center}.signup-card{max-width:800px;width:100%;background-color:var(--color-surface-elevated);border-radius:12px;box-shadow:var(--color-shadow-elevated);padding:2rem;border:1px solid var(--color-border)}.signup-header{text-align:center;margin-bottom:2rem}.signup-title{font-size:2rem;font-weight:700;margin-bottom:.5rem;line-height:1.2}.signup-subtitle{font-size:1.125rem;margin-bottom:0}.signup-form{width:100%}.name-check-container{display:flex;gap:.75rem;align-items:center}.name-check-container .form-input{flex:1}.name-check-container span{font-size:.875rem;font-weight:500;white-space:nowrap}.form-actions{display:flex;gap:1rem;justify-content:flex-end;margin-top:2rem}.signup-footer{margin-top:1rem;text-align:center;font-size:.875rem}@media (max-width: 768px){.signup-container{padding:1rem}.signup-card{padding:1.5rem}.signup-title{font-size:1.75rem}.form-actions{flex-direction:column}.form-grid-2,.form-grid-3{grid-template-columns:1fr}.name-check-container{flex-direction:column;align-items:stretch}.name-check-container span{text-align:center;padding:.5rem;background-color:var(--color-surface);border-radius:4px}}.form-input.error,.form-select.error{border-color:var(--color-error);background-color:var(--color-error-background)}.form-input.error:focus,.form-select.error:focus{border-color:var(--color-error);box-shadow:0 0 0 2px var(--color-error)}.tax-id-input{font-family:Courier New,monospace;letter-spacing:.5px}.tax-id-input.error{border-color:var(--color-error)}.tax-id-input.valid{border-color:var(--color-success)}.form-error{animation:fadeIn .3s ease-in-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}