:root{--primary-color:#e60000;--primary-hover:#b11230;--secondary-color:#f8f9fa;--text-primary:#2c3e50;--text-secondary:#6c757d;--border-color:#e9ecef;--success-color:#28a745;--warning-color:#ffc107;--danger-color:#dc3545;--shadow-sm:0 0.125rem 0.25rem rgba(0,0,0,.075);--shadow-md:0 0.5rem 1rem rgba(0,0,0,.15);--shadow-lg:0 1rem 3rem rgba(0,0,0,.175);--border-radius:0.5rem;--transition:all 0.3s ease}*{box-sizing:border-box;margin:0;padding:0}body{background-color:#fff;color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6}header{background:#fff;box-shadow:var(--shadow-md);position:sticky;top:0;z-index:1000}nav{justify-content:space-between;margin:0 auto;max-width:1200px;padding:.5rem 2rem}.logo,nav{align-items:center;display:flex}.logo{font-size:1.5rem;font-weight:700;transition:var(--transition)}.logo,.logo:hover{color:#000;text-decoration:none}.logo:hover{transform:scale(1.05)}.logo img{margin-right:.5rem}.nav-links{align-items:center;display:flex;gap:2rem;list-style:none}.nav-links a{border-radius:var(--border-radius);color:#000;padding:.5rem 1rem;text-decoration:none;transition:var(--transition)}.nav-links a:hover{background:rgba(0,0,0,.05);color:#000;text-decoration:none}.nav-links li{position:relative}.dropdown-menu{background:#fff;border-radius:var(--border-radius);box-shadow:var(--shadow-md);display:none;gap:.25rem;grid-template-columns:repeat(2,1fr);left:0;list-style:none;min-width:420px;padding:.5rem;position:absolute;top:100%;z-index:1001}.nav-links li:hover .dropdown-menu{display:grid}.dropdown-menu li{margin:0}.dropdown-menu a{align-items:center;border-radius:.25rem;color:#000;display:flex;padding:.75rem 1rem;text-decoration:none;transition:var(--transition);white-space:nowrap}.dropdown-menu a i{color:var(--primary-color);font-size:.9rem;margin-right:.5rem;text-align:center;width:1.2rem}.dropdown-menu a:hover{background:rgba(0,0,0,.05);color:#000}.dropdown-section-header{color:var(--text-secondary);font-size:.75rem;font-weight:700;grid-column:span 2;letter-spacing:.5px;margin-top:.5rem;padding:.75rem 1rem .5rem;text-transform:uppercase}.dropdown-section-header:first-child{margin-top:0}.auth-links{align-items:center}.nav-login{color:var(--text-primary)!important;font-weight:500}.nav-register{background:var(--primary-color)!important;border-radius:8px!important;color:#fff!important;font-weight:500}.nav-register:hover{background:var(--primary-hover)!important}.user-menu>a{align-items:center;display:flex;gap:6px}.user-menu>a i{color:var(--primary-color)}.user-dropdown{grid-template-columns:1fr!important;left:auto!important;min-width:180px!important;right:0}.user-dropdown a{align-items:center;display:flex;gap:10px}.mobile-menu-btn{background:none;border:none;color:#000;cursor:pointer;display:none;font-size:1.5rem}main{min-height:calc(100vh - 80px)}.hero{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;padding:4rem 2rem;text-align:center}.hero-content{margin:0 auto;max-width:800px}.hero h1{font-size:3rem;font-weight:700;margin-bottom:1rem}.hero p{font-size:1.25rem;margin-bottom:2rem;opacity:.9}.cta-button{background:var(--primary-color);border-radius:var(--border-radius);box-shadow:var(--shadow-md);display:inline-block;font-weight:600;padding:1rem 2rem;transition:var(--transition)}.cta-button,.cta-button:hover{color:#fff;text-decoration:none}.cta-button:hover{background:var(--primary-hover);box-shadow:var(--shadow-lg);transform:translateY(-2px)}.container{margin:0 auto;max-width:1200px;padding:0 2rem}.section{padding:4rem 0}.section-title{color:var(--text-primary);font-size:2.5rem;font-weight:700;margin-bottom:3rem;text-align:center}.pdf-tools-grid{display:grid;gap:2rem;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));margin-bottom:3rem}.tool-card{background:#fff;border:1px solid var(--border-color);border-radius:var(--border-radius);box-shadow:var(--shadow-sm);display:block;padding:2rem;text-align:center;transition:var(--transition)}.tool-card,.tool-card:hover{color:inherit;text-decoration:none}.tool-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-5px)}.tool-icon{color:var(--primary-color);font-size:3rem;margin-bottom:1rem}.tool-title{color:var(--text-primary);font-size:1.5rem;font-weight:600;margin-bottom:1rem}.tool-description{color:var(--text-secondary);line-height:1.6;margin-bottom:1.5rem}.tool-button{background:var(--primary-color);border-radius:var(--border-radius);color:#fff;display:inline-block;font-weight:500;padding:.75rem 1.5rem;text-decoration:none;transition:var(--transition)}.tool-card:hover .tool-button{background:var(--primary-hover);color:#fff;text-decoration:none}.features-section{background:var(--secondary-color)}.features-grid{display:grid;gap:2rem;grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.feature-item{padding:1.5rem;text-align:center}.feature-icon{color:var(--primary-color);font-size:2.5rem;margin-bottom:1rem}.feature-title{color:var(--text-primary);font-size:1.25rem;font-weight:600;margin-bottom:.5rem}.feature-text{color:var(--text-secondary)}footer{background:var(--text-primary);color:#fff;padding:3rem 0 1rem}.footer-content{display:grid;gap:2rem;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));margin-bottom:2rem}.footer-section h3{color:#fff;margin-bottom:1rem}.footer-section ul{list-style:none}.footer-section ul li{margin-bottom:.5rem}.footer-section a{color:#ccc;text-decoration:none;transition:var(--transition)}.footer-section a:hover{color:#fff}.footer-section i{text-align:center;width:20px}.footer-bottom{border-top:1px solid #444;color:#ccc;padding-top:2rem;text-align:center}@media (max-width:768px){.nav-links{background:#fff;box-shadow:var(--shadow-md);display:none;flex-direction:column;left:0;padding:1rem 0;position:absolute;right:0;top:100%}.nav-links.active{display:flex}.nav-links li{margin:0}.nav-links a{border-bottom:1px solid rgba(0,0,0,.1);display:block;padding:.75rem 2rem}.nav-links a:last-child{border-bottom:none}.dropdown-menu{background:rgba(0,0,0,.03);border-radius:0;box-shadow:none;display:none;grid-template-columns:1fr;min-width:auto;padding:0;position:static}.nav-links li.active .dropdown-menu{display:block}.dropdown-menu a{font-size:.9rem;padding:.5rem 2rem .5rem 3rem}.dropdown-section-header{grid-column:span 1;padding:.75rem 2rem .5rem}.mobile-menu-btn{display:block}nav{position:relative}.hero h1{font-size:2rem}.hero p{font-size:1rem}.section-title{font-size:2rem}.pdf-tools-grid{gap:1.5rem;grid-template-columns:1fr}.container{padding:0 1rem}nav{padding:1rem}}@media (max-width:480px){.hero{padding:2rem 1rem}.section{padding:2rem 0}.tool-card{padding:1.5rem}}.upload-area{background:var(--secondary-color);border:2px dashed var(--border-color);border-radius:var(--border-radius);margin:2rem 0;padding:2rem;text-align:center;transition:var(--transition)}.upload-area:hover{background:rgba(220,20,60,.05);border-color:var(--primary-color)}.upload-area.dragover{background:rgba(220,20,60,.1);border-color:var(--primary-color)}.file-input{display:none}.file-label{background:var(--primary-color);border-radius:var(--border-radius);color:#fff;cursor:pointer;display:inline-block;padding:.75rem 1.5rem;transition:var(--transition)}.file-label:hover{background:var(--primary-hover)}.progress-bar{background:var(--border-color);border-radius:4px;height:8px;margin:1rem 0;overflow:hidden;width:100%}.progress-fill{background:var(--primary-color);height:100%;transition:width .3s ease}.alert{border:1px solid transparent;border-radius:var(--border-radius);margin:1rem 0;padding:1rem 1.5rem}.alert-success{background:rgba(40,167,69,.1);border-color:var(--success-color);color:var(--success-color)}.alert-warning{background:rgba(255,193,7,.1);border-color:var(--warning-color);color:#856404}.alert-error{background:rgba(220,53,69,.1);border-color:var(--danger-color);color:var(--danger-color)}