:root{--primary-green:#2ecc71;--dark-green:#27ae60;--bg-dark:#1a252c;--bg-light:#f4f7f6;--text-dark:#333;--text-light:#fff;--gray:#95a5a6;--border:#e0e0e0}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-light);color:var(--text-dark);font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-weight:200;line-height:1.6}a{color:inherit;text-decoration:none}ul{list-style:none}h1,h2,h3,h4,h5,h6{margin-bottom:1rem;font-weight:300}p{margin-bottom:1rem}small,.small-text{font-weight:100}.text-green{color:var(--primary-green)}.container{max-width:1200px;margin:0 auto;padding:0 2rem}.navbar{background-color:var(--text-light);z-index:1000;position:sticky;top:0;box-shadow:0 2px 10px #0000001a}.navbar .container{justify-content:space-between;align-items:center;height:80px;display:flex}.logo{color:var(--bg-dark);align-items:center;gap:.5rem;font-size:1.5rem;font-weight:700;display:flex}.nav-links{gap:2rem;display:flex}.nav-links a{color:var(--text-dark);font-weight:600;transition:color .3s}.nav-links a:hover,.nav-links a.active{color:var(--primary-green)}.hero{color:var(--text-light);text-align:center;background:linear-gradient(#1a252cb3,#2c3e50cc),url(/images/hero_logistics.png) 50%/cover no-repeat;padding:140px 0}.hero h1{margin-bottom:1.5rem;font-size:3.5rem}.hero p{color:#ccc;max-width:800px;margin:0 auto 2rem;font-size:1.25rem}.btn{cursor:pointer;border:none;border-radius:50px;align-items:center;gap:.5rem;padding:.75rem 2rem;font-weight:600;transition:all .3s;display:inline-flex}.btn-primary{background-color:var(--primary-green);color:var(--text-light)}.btn-primary:hover{background-color:var(--dark-green);transform:translateY(-2px)}.btn-outline{border:2px solid var(--primary-green);color:var(--primary-green);background-color:#0000}.btn-outline:hover{background-color:var(--primary-green);color:var(--text-light)}.section{padding:80px 0}.section-title{text-align:center;color:var(--bg-dark);margin-bottom:3rem;font-size:2.5rem}.card-grid{grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem;display:grid}.card{background-color:var(--text-light);text-align:center;border-radius:10px;padding:2rem;transition:transform .3s,box-shadow .3s;box-shadow:0 5px 15px #0000000d}.card:hover{transform:translateY(-10px);box-shadow:0 15px 30px #0000001a}.card-icon{color:var(--primary-green);justify-content:center;margin-bottom:1.5rem;display:flex}.footer{background-color:var(--bg-dark);color:var(--text-light);padding:60px 0 20px}.footer-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:3rem;margin-bottom:3rem;display:grid}.footer-col h3{color:var(--primary-green);margin-bottom:1.5rem}.footer-col p,.footer-col a{color:var(--gray);margin-bottom:.5rem;display:block}.footer-col a:hover{color:var(--text-light)}.footer-bottom{text-align:center;color:var(--gray);border-top:1px solid #ffffff1a;padding-top:2rem}.materials-layout{gap:2rem;display:flex}@media (width<=768px){.materials-layout{flex-direction:column}}.materials-sidebar{background:var(--text-light);border-radius:10px;flex-shrink:0;width:300px;padding:2rem;box-shadow:0 2px 10px #0000000d}@media (width<=768px){.materials-sidebar{width:100%}}.materials-content{flex-grow:1}.category-list li{margin-bottom:1rem}.category-list button{color:var(--text-dark);cursor:pointer;text-align:left;background:0 0;border:none;border-radius:5px;justify-content:space-between;align-items:center;width:100%;padding:.75rem;font-size:1.1rem;font-weight:600;transition:background .2s,color .2s;display:flex}.category-list button:hover,.category-list button.active{background:var(--bg-light);color:var(--primary-green)}.subcategory-grid{grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:1.5rem;display:grid}.subcategory-card{background:var(--text-light);border-left:4px solid var(--primary-green);border-radius:8px;padding:1.5rem;transition:transform .2s;box-shadow:0 2px 5px #0000000d}.subcategory-card:hover{transform:translate(5px)}.subcategory-card h4{color:var(--bg-dark);margin-bottom:.5rem}.sub-sub-list{margin-top:1rem;padding-left:1rem}.sub-sub-list li{color:var(--text-dark);margin-bottom:.5rem;font-size:.9rem;position:relative}.sub-sub-list li:before{content:"•";color:var(--primary-green);position:absolute;left:-1rem}.contact-form{background:var(--text-light);border-radius:10px;max-width:600px;margin:0 auto;padding:3rem;box-shadow:0 5px 15px #0000000d}.form-group{margin-bottom:1.5rem}.form-group label{margin-bottom:.5rem;font-weight:600;display:block}.form-group input,.form-group textarea{border:1px solid var(--border);border-radius:5px;width:100%;padding:.75rem;font-family:inherit;transition:border-color .3s}.form-group input:focus,.form-group textarea:focus{border-color:var(--primary-green);outline:none}.form-group textarea{resize:vertical;min-height:120px}