@keyframes fadeIn{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUpAndScale{0%{opacity:0;transform:translateY(30px) scale(.95)}to{opacity:1;transform:translateY(0) scale(1)}}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(360deg)}}*{margin:0;padding:0;box-sizing:border-box}body,html{overflow-x:hidden;max-width:100%}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:#333;background:linear-gradient(135deg,#667eea 0,#764ba2 100%);min-height:100vh;position:relative}.container{max-width:1200px;margin:0 auto;padding:0 20px}.main-header{background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.2);position:sticky;top:0;z-index:100}.header-content,.logo-section{display:flex;align-items:center}.header-content{justify-content:space-between;padding:1rem 0}.logo-section{gap:12px}.logo{width:40px;height:40px}.logo-section h1{font-size:1.5rem;font-weight:600;color:#2d3748}.main-nav{display:flex;gap:2rem}.auth-buttons,.user-menu{margin-left:2rem}.footer-links a,.main-nav a{text-decoration:none;transition:color .2s}.main-nav a{color:#4a5568;font-weight:500}.main-nav a:hover{color:#667eea}.hero{padding:4rem 0;text-align:center;color:#fff}.hero-content h2{font-size:3rem;font-weight:700;margin-bottom:1rem;text-shadow:0 2px 4px rgba(0,0,0,.1)}.hero-content>p{font-size:1.25rem;margin-bottom:3rem;opacity:.9;max-width:600px;margin-left:auto;margin-right:auto}.upload-section{max-width:600px;margin:0 auto 3rem}.upload-area{background:rgba(255,255,255,.1);backdrop-filter:blur(10px);border:2px dashed rgba(255,255,255,.3);border-radius:12px;padding:3rem 2rem;cursor:pointer;transition:all .3s ease;margin-bottom:1rem}.upload-area.drag-over,.upload-area:hover{background:rgba(255,255,255,.2);border-color:rgba(255,255,255,.5);transform:translateY(-2px)}.upload-content{text-align:center}.upload-icon{font-size:3rem;margin-bottom:1rem;display:block}.quick-tools h3,.upload-content h3{font-size:1.5rem;margin-bottom:.5rem;color:#fff}.upload-content p{opacity:.8;margin-bottom:1.5rem}.btn{display:inline-flex;align-items:center;gap:.5rem;padding:.75rem 1.5rem;border:0;border-radius:8px;font-weight:500;text-decoration:none;cursor:pointer;transition:all .2s;font-size:1rem}.btn-primary{background:#667eea;color:#fff}.btn-primary:hover{background:#5a67d8;transform:translateY(-1px);box-shadow:0 4px 12px rgba(102,126,234,.4)}.btn-secondary{background:rgba(255,255,255,.2);color:#fff;border:1px solid rgba(255,255,255,.3)}.btn-secondary:hover{background:rgba(255,255,255,.3)}.btn-small{padding:.5rem 1rem;font-size:.875rem}.error-message{background:rgba(244,63,94,.9);color:#fff;padding:1rem;border-radius:8px;display:flex;align-items:center;gap:.5rem;backdrop-filter:blur(10px)}.quick-tools{margin:2rem 0}.quick-tools h3{margin-bottom:1.5rem}.tools-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1rem;max-width:800px;margin:0 auto}.tool-card{background:rgba(255,255,255,.1);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.2);border-radius:12px;padding:1.5rem;text-align:center;cursor:pointer;transition:all .3s ease;color:#fff}.tool-card:hover{background:rgba(255,255,255,.2);transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.2)}.tool-icon{font-size:2rem;display:block;margin-bottom:.5rem}.file-info h4,.tool-card h4{font-size:1.125rem;margin-bottom:.5rem}.tool-card h4{font-weight:600}.tool-card p{opacity:.8;font-size:.875rem;line-height:1.4}.recent-files{background:#fff;padding:3rem 0}.recent-files h3{font-size:2rem;margin-bottom:2rem;text-align:center;color:#2d3748}.files-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.5rem}.file-card{background:#fff;border:1px solid #e2e8f0;border-radius:12px;padding:1.5rem;box-shadow:0 2px 4px rgba(0,0,0,.1);transition:all .2s}.file-card:hover{box-shadow:0 8px 25px rgba(0,0,0,.15);transform:translateY(-2px)}.features h2,.file-icon{font-size:2rem;margin-bottom:1rem;text-align:center}.file-info h4{color:#2d3748;word-break:break-word}.file-info p{color:#718096;font-size:.875rem;margin-bottom:.25rem}.file-actions{margin-top:1rem;text-align:center}.features{padding:4rem 0;background:#fff}.features h2{font-size:2.5rem;margin-bottom:3rem;color:#2d3748}.features-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:2rem}.feature{text-align:center;padding:2rem}.feature-icon{font-size:3rem;display:block;margin-bottom:1rem}.feature h3{font-size:1.25rem;margin-bottom:1rem;color:#2d3748}.feature p{color:#718096;line-height:1.6}.main-footer{background:#2d3748;color:#fff;padding:2rem 0;text-align:center}.footer-links{margin-top:1rem;display:flex;justify-content:center;gap:2rem}.footer-links a{color:#a0aec0}.footer-links a:hover{color:#fff}.mobile-nav-controls{display:none}.hamburger-menu{background:0 0;border:0;cursor:pointer;padding:8px;display:flex;flex-direction:column;gap:5px;justify-content:center;align-items:center;width:44px;height:44px;border-radius:8px;transition:background-color .3s ease}.hamburger-menu:hover{background:rgba(102,126,234,.1)}.hamburger-line{width:24px;height:3px;background-color:#4a5568;border-radius:2px;transition:all .3s ease}.hamburger-menu.active .hamburger-line:nth-child(1){transform:translateY(8px) rotate(45deg)}.hamburger-menu.active .hamburger-line:nth-child(2){opacity:0}.hamburger-menu.active .hamburger-line:nth-child(3){transform:translateY(-8px) rotate(-45deg)}.mobile-menu-overlay{position:fixed;top:0;left:0;width:100%;height:100vh;background:rgba(0,0,0,.5);backdrop-filter:blur(4px);z-index:999;opacity:0;visibility:hidden;transition:opacity .3s ease,visibility .3s ease}.mobile-menu-overlay.active{opacity:1;visibility:visible}.mobile-menu{position:fixed;top:0;right:-100%;width:85%;max-width:380px;height:100vh;background:#fff;z-index:1000;overflow-y:auto;transition:right .3s ease;box-shadow:-4px 0 20px rgba(0,0,0,.1)}.mobile-menu.active{right:0}.mobile-menu-close{position:absolute;top:20px;right:20px;background:rgba(102,126,234,.1);border:0;width:44px;height:44px;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .3s ease;z-index:10}.mobile-menu-close:hover{background:rgba(102,126,234,.2);transform:rotate(90deg)}.mobile-menu-close .close-icon{font-size:24px;color:#4a5568;font-weight:300}.mobile-menu-content{padding:80px 20px 40px}.mobile-menu-section{margin-bottom:24px}.mobile-menu-item{display:flex;align-items:center;gap:16px;padding:16px 20px;margin-bottom:4px;color:#2d3748;text-decoration:none;border-radius:12px;transition:all .2s ease;font-weight:500;font-size:1rem}.mobile-menu-item:hover{background:#f7fafc;color:#667eea;transform:translateX(4px)}.mobile-menu-item .menu-icon{font-size:18px;width:28px;text-align:center;color:#667eea;display:flex;align-items:center;justify-content:center}.mobile-menu-item .menu-icon i{font-size:18px}.mobile-menu-divider{height:1px;background:#e2e8f0;margin:24px 0}.mobile-user-info{display:flex;align-items:center;gap:16px;padding:20px;background:linear-gradient(135deg,#667eea 0,#764ba2 100%);border-radius:16px;margin-bottom:16px}.mobile-user-avatar{width:56px;height:56px;border-radius:50%;background:rgba(255,255,255,.2);display:flex;align-items:center;justify-content:center;font-weight:700;font-size:20px;color:#fff;flex-shrink:0}.mobile-user-details{flex:1;min-width:0}.mobile-user-name{font-weight:700;color:#fff;margin-bottom:4px;font-size:1.1rem}.mobile-user-email{color:rgba(255,255,255,.9);font-size:.875rem;margin-bottom:8px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mobile-user-plan{display:inline-block;background:rgba(255,255,255,.2);color:#fff;padding:4px 12px;border-radius:12px;font-size:.75rem;font-weight:600}.mobile-auth-section{display:flex;flex-direction:column;gap:12px;padding:0 20px}.mobile-menu-btn{display:block;text-align:center;padding:14px 24px;border-radius:12px;text-decoration:none;font-weight:600;font-size:1rem;transition:all .3s ease}.btn-login-mobile{background:0 0;border:2px solid #667eea;color:#667eea}.btn-login-mobile:hover{background:#667eea;color:#fff}.btn-signup-mobile{background:linear-gradient(135deg,#667eea 0,#764ba2 100%);color:#fff;border:0;box-shadow:0 4px 12px rgba(102,126,234,.3)}.btn-signup-mobile:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(102,126,234,.4)}@media (min-width:769px){.mobile-menu-overlay,.mobile-nav-controls{display:none!important}}@media (max-width:768px){.container{padding:0 15px}.header-content{flex-direction:row;align-items:center;justify-content:space-between;padding:.75rem 0;gap:12px}.logo-section{flex-shrink:0}.logo{width:36px;height:36px}.logo-section h1{font-size:1.2rem}.desktop-nav{display:none!important}.mobile-nav-controls{gap:8px}.mobile-lang-switcher,.mobile-nav-controls{display:flex;align-items:center}.hero-content h2{font-size:2rem}.hero-content>p{font-size:1rem}.upload-area{padding:2rem 1rem}.tools-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.features-grid{grid-template-columns:1fr}.footer-links{flex-direction:column;gap:1rem}}@media (max-width:380px){.logo{width:32px;height:32px}.logo-section h1{font-size:1.1rem}.mobile-menu{width:100%;max-width:none}}@media (max-width:480px){.hero{padding:2rem 0}.hero-content h2{font-size:1.75rem}.upload-content h3{font-size:1.25rem}.tool-card{padding:1rem}.features{padding:3rem 0}.recent-files{padding:2rem 0}}.hero-content,.quick-tools,.upload-section{animation:fadeIn .6s ease-out}.quick-tools{animation-delay:.2s}.upload-area.drag-over{border-color:#667eea;background:rgba(102,126,234,.1)}.btn:focus,.file-card:focus,.tool-card:focus{outline:2px solid #667eea;outline-offset:2px}@media print{.hero,.main-footer,.main-header{display:none}}body.dark-mode .welcome-screen{--bg-primary:#1a1a1a;--bg-secondary:#2d2d2d;--bg-tertiary:#404040;--text-primary:#ffffff;--text-secondary:#e8eaed;--text-muted:#9aa0a6;--border-color:#5f6368;--border-light:#404040;--shadow-light:0 1px 2px rgba(0, 0, 0, 0.3);--shadow-medium:0 2px 6px rgba(0, 0, 0, 0.2);--shadow-heavy:0 4px 12px rgba(0, 0, 0, 0.3)}.upload-loading-modal{position:fixed;top:0;left:0;width:100%;height:100%;display:flex;align-items:center;justify-content:center;z-index:10000;animation:fadeIn .3s ease-out}.upload-loading-backdrop{position:absolute;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.8);backdrop-filter:blur(10px)}.upload-loading-content{position:relative;background:#fff;border-radius:16px;padding:3rem 2rem;text-align:center;max-width:400px;width:90%;box-shadow:0 20px 60px rgba(0,0,0,.3);animation:slideUpAndScale .4s cubic-bezier(.34,1.56,.64,1)}.upload-loading-animation{position:relative;width:80px;height:80px;margin:0 auto 2rem}.upload-spinner{position:absolute;top:0;left:0;width:100%;height:100%;border:3px solid rgba(102,126,234,.2);border-top:3px solid #667eea;border-radius:50%;animation:spin 1s linear infinite}.upload-progress-ring{position:absolute;top:10px;left:10px;width:60px;height:60px}.upload-progress-bg{stroke:rgba(102,126,234,.1)}.upload-progress-bar{stroke:#667eea;stroke-linecap:round;transform:rotate(-90deg);transform-origin:50% 50%;transition:stroke-dashoffset .3s ease}#uploadStatusTitle{font-size:1.5rem;font-weight:600;color:#2d3748;margin-bottom:.5rem}#uploadStatusMessage{color:#4a5568;margin-bottom:2rem;font-size:1rem}.upload-features{display:flex;justify-content:center;gap:2rem;margin-bottom:1.5rem}.upload-feature{display:flex;align-items:center;gap:.5rem;font-size:.875rem;color:#667eea;font-weight:500}.upload-feature .feature-icon{font-size:1rem}.upload-progress-text{margin-top:1rem}.upload-progress-text small{color:#718096;font-size:.8rem}@media (prefers-color-scheme:dark){.upload-loading-content{background:#2d2d2d;color:#e8eaed}#uploadStatusTitle{color:#fff}#uploadStatusMessage{color:#e8eaed}.upload-progress-text small{color:#9aa0a6}}@media (max-width:480px){.upload-loading-content{padding:2rem 1.5rem;margin:1rem}.upload-loading-animation{width:60px;height:60px;margin-bottom:1.5rem}.upload-progress-ring{top:8px;left:8px}.upload-progress-ring,.upload-progress-ring svg{width:44px;height:44px}.upload-progress-bar,.upload-progress-bg{cx:22;cy:22;r:18}#uploadStatusTitle{font-size:1.25rem}.upload-features{flex-direction:column;gap:1rem}}