:root{--cw-primary: #667eea;--cw-primary-dark: #5a6fd8;--cw-primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--cw-secondary: #e9ecef;--cw-secondary-dark: #dee2e6;--cw-accent: #ffd700;--cw-text-primary: #333;--cw-text-secondary: #666;--cw-text-muted: #999;--cw-text-white: #ffffff;--cw-bg-primary: #ffffff;--cw-bg-secondary: #f8f9fa;--cw-border-light: #e9ecef;--cw-space-sm: .5rem;--cw-space-md: 1rem;--cw-space-lg: 1.5rem;--cw-space-xl: 2rem;--cw-space-2xl: 3rem;--cw-space-3xl: 4rem;--cw-text-lg: 1.1rem;--cw-text-xl: 1.2rem;--cw-text-2xl: 1.5rem;--cw-text-3xl: 1.8rem;--cw-text-4xl: 2rem;--cw-text-5xl: 2.5rem;--cw-text-6xl: 3rem;--cw-radius-lg: 12px;--cw-radius-xl: 16px;--cw-shadow-lg: 0 4px 12px rgba(0, 0, 0, .1);--cw-shadow-2xl: 0 8px 24px rgba(0, 0, 0, .1);--cw-shadow-primary: 0 8px 20px rgba(102, 126, 234, .3);--cw-transition-base: .3s ease;--cw-container-xl: 1200px}.hero{background:var(--cw-primary-gradient);color:var(--cw-text-white);padding:var(--cw-space-3xl) var(--cw-space-xl);text-align:center}.hero-content{max-width:1200px;margin:0 auto}.hero-content h1{font-size:var(--cw-text-6xl);margin-bottom:var(--cw-space-md);font-weight:700}.hero-description{font-size:var(--cw-text-xl);max-width:600px;margin-left:auto;margin-right:auto;opacity:.9;line-height:1.6}.container{max-width:var(--cw-container-xl);margin:0 auto}.btn-primary,.btn-secondary{padding:var(--cw-space-md) var(--cw-space-xl);border:none;border-radius:var(--cw-radius-lg);font-size:var(--cw-text-lg);font-weight:600;cursor:pointer;transition:all var(--cw-transition-base);min-width:180px}.btn-primary{background:var(--cw-primary-gradient);color:var(--cw-text-white)}.btn-primary:hover:not(:disabled){transform:translateY(-2px);box-shadow:var(--cw-shadow-primary)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--cw-secondary);color:var(--cw-text-primary)}.btn-secondary:hover{background:var(--cw-secondary-dark);transform:translateY(-2px)}.input-group{margin-bottom:var(--cw-space-xl)}.input-group label{display:block;margin-bottom:var(--cw-space-sm);font-weight:600;color:var(--cw-text-primary);font-size:var(--cw-text-lg)}.calculator-section,.tools-section{padding:var(--cw-space-3xl) var(--cw-space-xl)}.tools-section,.calculator-section{background:var(--cw-bg-secondary)}.calculator-card{background:var(--cw-bg-primary);border-radius:var(--cw-radius-xl);padding:var(--cw-space-2xl);box-shadow:var(--cw-shadow-2xl);margin-bottom:var(--cw-space-2xl);border:2px solid var(--cw-border-light)}.calculator-card h2{text-align:center;font-size:var(--cw-text-3xl);margin-bottom:var(--cw-space-xl);color:var(--cw-text-primary)}.tools-section h2{text-align:center;font-size:var(--cw-text-5xl);margin-bottom:var(--cw-space-2xl);color:var(--cw-text-primary)}.about-section{padding:var(--cw-space-3xl) var(--cw-space-xl);background:var(--cw-bg-primary)}.about-section h2{text-align:center;font-size:var(--cw-text-5xl);margin-bottom:var(--cw-space-2xl);color:var(--cw-text-primary)}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:var(--cw-space-xl)}.feature{text-align:center;padding:var(--cw-space-xl)}.feature-icon{font-size:var(--cw-text-6xl);margin-bottom:var(--cw-space-md)}.feature h3{font-size:var(--cw-text-2xl);margin-bottom:var(--cw-space-md);color:var(--cw-text-primary)}.feature p{color:var(--cw-text-secondary);line-height:1.6}.tools-grid{display:flex;flex-direction:column;gap:var(--cw-space-2xl)}.tool-category h3{font-size:var(--cw-text-2xl);margin-bottom:var(--cw-space-lg);color:var(--cw-text-primary);border-bottom:2px solid var(--cw-primary);padding-bottom:var(--cw-space-sm)}.tools-row{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:var(--cw-space-lg)}.button-group{display:flex;gap:var(--cw-space-md);justify-content:center;flex-wrap:wrap}.date-input{width:100%;padding:var(--cw-space-md);border:2px solid var(--cw-border-light);border-radius:var(--cw-radius-lg);font-size:var(--cw-text-lg);transition:all var(--cw-transition-base);background:var(--cw-bg-secondary)}.date-input:focus{outline:none;border-color:var(--cw-primary);background:var(--cw-bg-primary);box-shadow:0 0 0 3px #667eea1a}.input-help{display:block;margin-top:var(--cw-space-sm);color:var(--cw-text-secondary);font-size:.9rem;font-style:italic}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media (max-width: 768px){.hero{padding:var(--cw-space-xl) var(--cw-space-md)}.hero-content h1{font-size:var(--cw-text-4xl)}.calculator-section,.tools-section{padding:var(--cw-space-xl) var(--cw-space-md)}.calculator-card{padding:var(--cw-space-xl)}.btn-primary,.btn-secondary{min-width:200px}}@media (max-width: 480px){.hero,.calculator-section,.tools-section{padding:var(--cw-space-xl) var(--cw-space-sm)}.calculator-card{padding:var(--cw-space-lg)}.button-group{flex-direction:column;align-items:center}}:root{--cw-primary: #667eea;--cw-primary-dark: #5a6fd8;--cw-primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);--cw-secondary: #e9ecef;--cw-secondary-dark: #dee2e6;--cw-accent: #ffd700;--cw-text-primary: #333;--cw-text-secondary: #666;--cw-text-muted: #999;--cw-text-white: #ffffff;--cw-bg-primary: #ffffff;--cw-bg-secondary: #f8f9fa;--cw-border-light: #e9ecef;--cw-space-xs: .25rem;--cw-space-sm: .5rem;--cw-space-md: 1rem;--cw-space-lg: 1.5rem;--cw-space-xl: 2rem;--cw-space-2xl: 3rem;--cw-space-3xl: 4rem;--cw-text-xs: .75rem;--cw-text-sm: .85rem;--cw-text-base: 1rem;--cw-text-lg: 1.1rem;--cw-text-xl: 1.2rem;--cw-text-2xl: 1.5rem;--cw-text-3xl: 1.8rem;--cw-text-4xl: 2rem;--cw-text-5xl: 2.5rem;--cw-text-6xl: 3rem;--cw-radius-sm: 4px;--cw-radius-md: 8px;--cw-radius-lg: 12px;--cw-radius-xl: 16px;--cw-radius-2xl: 20px;--cw-shadow-sm: 0 2px 4px rgba(0, 0, 0, .05);--cw-shadow-md: 0 4px 6px rgba(0, 0, 0, .1);--cw-shadow-lg: 0 4px 12px rgba(0, 0, 0, .1);--cw-shadow-xl: 0 8px 20px rgba(0, 0, 0, .15);--cw-shadow-2xl: 0 8px 24px rgba(0, 0, 0, .1);--cw-shadow-primary: 0 8px 20px rgba(102, 126, 234, .3);--cw-transition-fast: .15s ease;--cw-transition-base: .3s ease;--cw-transition-slow: .5s ease;--cw-container-sm: 640px;--cw-container-md: 768px;--cw-container-lg: 1024px;--cw-container-xl: 1200px;--cw-container-2xl: 1400px}*{box-sizing:border-box}.cw-text-center{text-align:center}.cw-flex{display:flex}.cw-flex-center{display:flex;justify-content:center;align-items:center}.cw-grid{display:grid}.cw-grid-3{grid-template-columns:repeat(3,1fr)}.cw-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}*{box-sizing:border-box;margin:0;padding:0}