:root{--primary-color:#0d6efd;--secondary-color:#6c757d;--success-color:#198754;--danger-color:#dc3545;--warning-color:#ffc107;--info-color:#0dcaf0;--light-color:#f8f9fa;--dark-color:#212529;--border-radius:8px;--box-shadow:0 2px 10px rgba(0,0,0,0.1);--transition:all 0.3s ease}*{margin:0;padding:0;box-sizing:border-box}body{font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background-color:#f5f7fa;color:var(--dark-color);line-height:1.6}.hero-text{color:#fff}a{text-decoration:none;color:var(--primary-color);transition:var(--transition)}a:hover{color:#0a58ca}.site-header{background:#fff;box-shadow:var(--box-shadow);position:sticky;top:0;z-index:1000}.header-container{max-width:1400px;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between;height:70px}.site-logo{font-size:24px;font-weight:700;color:var(--primary-color)}.site-logo span{color:var(--success-color)}.main-navigation ul{display:flex;list-style:none;gap:5px}.main-navigation a{display:block;padding:10px 15px;color:var(--dark-color);font-weight:500;border-radius:var(--border-radius);transition:var(--transition)}.main-navigation a:hover,.main-navigation .current-menu-item a{background:var(--primary-color);color:#fff}.mega-menu{position:relative}.mega-menu .mega-menu-content{position:absolute;top:100%;left:0;width:600px;background:#fff;box-shadow:0 5px 20px rgb(0 0 0 / .15);border-radius:var(--border-radius);padding:20px;opacity:0;visibility:hidden;transform:translateY(10px);transition:var(--transition)}.mega-menu:hover .mega-menu-content{opacity:1;visibility:visible;transform:translateY(0)}.mega-menu-content .menu-column h4{font-size:14px;text-transform:uppercase;color:var(--primary-color);margin-bottom:15px;padding-bottom:10px;border-bottom:2px solid var(--primary-color)}.mega-menu-content .menu-column ul{list-style:none}.mega-menu-content .menu-column li{margin-bottom:8px}.mega-menu-content .menu-column a{color:var(--secondary-color);font-size:14px;transition:var(--transition)}.mega-menu-content .menu-column a:hover{color:var(--primary-color);padding-left:5px}.calculator-card{background:#fff;border-radius:12px;padding:30px;box-shadow:var(--box-shadow);margin-bottom:30px;transition:var(--transition)}.calculator-card:hover{transform:translateY(-5px);box-shadow:0 10px 30px rgb(0 0 0 / .15)}.calculator-card h2{font-size:24px;margin-bottom:20px;color:var(--dark-color)}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:500;color:var(--dark-color)}.form-control{width:100%;padding:12px 15px;border:2px solid #e9ecef;border-radius:var(--border-radius);font-size:16px;transition:var(--transition)}.form-control:focus{outline:none;border-color:var(--primary-color);box-shadow:0 0 0 3px rgb(13 110 253 / .1)}.btn{display:inline-block;padding:12px 30px;border:none;border-radius:var(--border-radius);font-size:16px;font-weight:500;cursor:pointer;transition:var(--transition)}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{background:#0a58ca;color:#fff}.btn-success{background:var(--success-color);color:#fff}.btn-success:hover{background:#146c43;color:#fff}.nav-tabs{display:flex;border-bottom:2px solid #e9ecef;margin-bottom:25px}.nav-tab{padding:12px 25px;cursor:pointer;border:none;background:none;font-size:16px;font-weight:500;color:var(--secondary-color);position:relative;transition:var(--transition)}.nav-tab:hover{color:var(--primary-color)}.nav-tab.active{color:var(--primary-color)}.nav-tab.active::after{content:'';position:absolute;bottom:-2px;left:0;width:100%;height:2px;background:var(--primary-color)}.result-box{background:linear-gradient(135deg,#667eea 0%,#764ba2 100%);color:#fff;padding:25px;border-radius:12px;margin-top:25px;display:none}.result-box.show{display:block;animation:fadeIn 0.5s ease}@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.result-box h3{font-size:18px;margin-bottom:15px}.result-item{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px solid rgb(255 255 255 / .2)}.result-item:last-child{border-bottom:none}.result-value{font-weight:700;font-size:18px}.site-footer{background:var(--dark-color);color:#fff;padding:50px 0 20px;margin-top:50px}.footer-container{max-width:1400px;margin:0 auto;padding:0 20px;display:grid;grid-template-columns:repeat(4,1fr);gap:30px}.footer-widget h4{font-size:18px;margin-bottom:20px;color:#fff}.footer-widget ul{list-style:none}.footer-widget li{margin-bottom:10px}.footer-widget a{color:#adb5bd;transition:var(--transition)}.footer-widget a:hover{color:#fff}.footer-bottom{text-align:center;padding-top:20px;margin-top:30px;border-top:1px solid #495057;color:#6c757d}@media (max-width:992px){.footer-container{grid-template-columns:repeat(2,1fr)}.mega-menu .mega-menu-content{width:100%}}@media (max-width:768px){.header-container{flex-direction:column;height:auto;padding:15px 20px}.main-navigation ul{flex-wrap:wrap;justify-content:center}.footer-container{grid-template-columns:1fr}.calculator-card{padding:20px}}