:root{--bg-primary: #ffffff;--bg-secondary: #f8f9fa;--bg-subtle: #f8f9fa;--bg-hover: #eef0f2;--bg-card: #ffffff;--bg-diagram: #f8fafc;--text-primary: #1a1a2e;--text-secondary: #444444;--text-muted: #666666;--border-color: #e0e0e0;--border-light: #eeeeee;--header-bg: #2c3e50;--header-text: #ffffff;--footer-bg: #1a252f;--footer-text: rgba(255, 255, 255, .8);--accent-primary: #2c3e50;--accent-hover: #1a252f;--success-text: #2e7d32;--success-border: #a5d6a7;--bg-success-light: #e8f5e9;--info-text: #1565c0;--info-border: #90caf9;--bg-info-light: #e3f2fd;--warning-text: #f57f17;--warning-text-dark: #5d4a0a;--warning-border: #ffe082;--warning-accent: #ffc107;--bg-warning-light: #fff8e1;--error-text: #c0392b;--error-border: #e74c3c;--bg-error-light: #fdecea}[data-theme=dark]{--bg-primary: #1a1a2e;--bg-secondary: #242442;--bg-subtle: #2a2a4a;--bg-hover: #333358;--bg-card: #242442;--bg-diagram: #1e1e3a;--text-primary: #f0f0f5;--text-secondary: #b8b8cc;--text-muted: #8888a0;--border-color: #3a3a5a;--border-light: #2a2a4a;--header-bg: #0f0f1a;--header-text: #ffffff;--footer-bg: #0a0a12;--footer-text: rgba(255, 255, 255, .7);--accent-primary: #4a6fa5;--accent-hover: #5a7fb5;--success-text: #66bb6a;--success-border: #2e7d32;--bg-success-light: #1b3d1e;--info-text: #64b5f6;--info-border: #1565c0;--bg-info-light: #152538;--warning-text: #ffca28;--warning-text-dark: #ffd54f;--warning-border: #f57f17;--warning-accent: #ff8f00;--bg-warning-light: #3d3010;--error-text: #ef5350;--error-border: #c62828;--bg-error-light: #3d1515}*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--bg-primary);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;transition:background-color .3s ease,color .3s ease}img{max-width:100%;height:auto}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.app-header{background:var(--header-bg);color:var(--header-text);padding:15px 20px;transition:background-color .3s ease;position:relative;z-index:100}.header-content{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center}.logo{font-size:1.3rem;font-weight:700;color:var(--header-text);text-decoration:none;z-index:101}.desktop-nav{display:flex;gap:20px;align-items:center}.desktop-nav a{color:#fffc;text-decoration:none;transition:color .2s}.desktop-nav a:hover,.desktop-nav a[data-status=active]{color:#fff}.github-link{display:flex;align-items:center;gap:8px;color:#fffc;transition:color .2s}.github-link:hover{color:#fff}.github-link svg{flex-shrink:0}.theme-toggle{background:none;border:none;font-size:1.2rem;cursor:pointer;padding:6px 10px;border-radius:6px;transition:background-color .2s;line-height:1;color:var(--header-text)}.theme-toggle:hover{background:#ffffff1a}.mobile-nav-controls{display:none;align-items:center;gap:8px;z-index:101}.hamburger-btn{display:flex;align-items:center;justify-content:center;width:44px;height:44px;background:none;border:none;color:var(--header-text);cursor:pointer;border-radius:8px;transition:background-color .2s}.hamburger-btn:hover{background:#ffffff1a}.mobile-nav-overlay{display:none;position:fixed;inset:0;width:100%;height:100%;background:#00000080;border:none;padding:0;margin:0;cursor:default;z-index:98;animation:fadeIn .2s ease}.mobile-nav{display:none;position:fixed;top:0;right:-280px;width:280px;height:100vh;background:var(--bg-primary);flex-direction:column;padding:80px 24px 24px;gap:8px;z-index:99;transition:right .3s ease;box-shadow:-4px 0 20px #00000026}.mobile-nav.open{right:0}.mobile-nav a{display:flex;align-items:center;gap:12px;color:var(--text-primary);text-decoration:none;padding:14px 16px;border-radius:8px;font-size:1rem;transition:background-color .2s}.mobile-nav a:hover,.mobile-nav a[data-status=active]{background:var(--bg-secondary)}.mobile-nav .github-link{color:var(--text-primary)}@media(max-width:768px){.desktop-nav{display:none}.mobile-nav-controls,.mobile-nav{display:flex}.mobile-nav-overlay{display:block}}main{min-height:calc(100vh - 140px)}.app-footer{background:var(--footer-bg);color:var(--footer-text);padding:30px 20px;margin-top:auto;transition:background-color .3s ease}.footer-content{max-width:1200px;margin:0 auto;text-align:center}.footer-links{display:flex;justify-content:center;gap:24px;margin-bottom:16px;flex-wrap:wrap}.footer-links a{color:var(--footer-text);text-decoration:none;transition:color .2s}.footer-links a:hover{color:#fff}.footer-tagline{margin:0 0 8px;font-size:1rem;font-weight:500}.footer-copyright{margin:0;font-size:.85rem;opacity:.7}.home-page{max-width:800px;margin:0 auto;padding:40px 20px;text-align:center}.hero h1{font-size:2.5rem;margin-bottom:10px;color:var(--text-primary)}.tagline{font-size:1.2rem;color:var(--text-muted);margin-bottom:40px}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:30px;margin-bottom:40px;text-align:left}.feature{padding:20px;background:var(--bg-secondary);border-radius:8px;border:1px solid var(--border-color);transition:background-color .3s ease,border-color .3s ease}.feature h3{margin-top:0;font-size:1.1rem;color:var(--text-primary)}.feature p{margin-bottom:0;color:var(--text-muted);font-size:.9rem}.home-page .upload-button{display:inline-block;padding:15px 40px;background:var(--accent-primary);color:#fff;text-decoration:none;border-radius:8px;font-size:1.1rem;font-weight:500;transition:background .2s}.home-page .upload-button:hover{background:var(--accent-hover)}.upload-page{max-width:500px;margin:0 auto;padding:40px 20px}.upload-page h1{text-align:center;margin-bottom:30px;color:var(--text-primary)}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:8px;font-weight:500;color:var(--text-primary)}.form-group input[type=text],.form-group input[type=password],.form-group input[type=file]{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:6px;font-size:16px;background:var(--bg-card);color:var(--text-primary);transition:border-color .2s,background-color .3s}.form-group input:focus{outline:none;border-color:var(--accent-primary)}.password-input-wrapper{display:flex;flex-direction:column;gap:8px}.password-input{position:relative;flex:1}.password-input input{padding-right:50px}.toggle-password{position:absolute;right:10px;top:50%;transform:translateY(-50%);background:none;border:none;cursor:pointer;font-size:18px}.password-actions{display:flex;gap:8px}.generate-password-btn,.copy-password-btn{padding:8px 12px;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-secondary);color:var(--text-primary);font-size:14px;cursor:pointer;transition:background .2s,border-color .2s}.generate-password-btn:hover:not(:disabled),.copy-password-btn:hover{background:var(--bg-hover);border-color:var(--accent-primary)}.generate-password-btn:disabled{opacity:.5;cursor:not-allowed}.checkbox label{display:flex;align-items:center;gap:8px;cursor:pointer;color:var(--text-primary)}.checkbox input{width:auto}.file-info{margin-top:8px;color:var(--text-muted);font-size:14px}.drop-zone{border:2px dashed var(--border-color);border-radius:12px;padding:30px 20px;text-align:center;transition:border-color .2s,background-color 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0}.file-name{font-size:16px;font-weight:500;color:var(--text-primary);margin:0;word-break:break-all}.file-size{font-size:14px;color:var(--text-muted);margin:0}.change-file-btn{margin-top:8px;padding:8px 16px;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-card);color:var(--text-primary);font-size:14px;cursor:pointer;transition:background .2s}.change-file-btn:hover:not(:disabled){background:var(--bg-hover)}.change-file-btn:disabled{opacity:.5;cursor:not-allowed}.password-errors{margin:8px 0 0;padding-left:20px;color:var(--error-text);font-size:14px}.error{color:var(--error-text);font-size:14px;margin-top:4px}.error-message{background:var(--bg-error-light);border:1px solid var(--error-border);padding:12px;border-radius:6px;color:var(--error-text);margin-bottom:20px}.progress{margin-bottom:20px}.progress-bar{height:8px;background:var(--accent-primary);border-radius:4px;transition:width .3s}.progress p{margin-top:8px;color:var(--text-muted);font-size:14px}.upload-page .upload-button{width:100%;padding:15px;background:var(--accent-primary);color:#fff;border:none;border-radius:6px;font-size:16px;font-weight:500;cursor:pointer;transition:background .2s}.upload-page .upload-button:hover:not(:disabled){background:var(--accent-hover)}.upload-page .upload-button:disabled{background:var(--text-muted);opacity:.6;cursor:not-allowed}.result{text-align:center}.result h2{color:var(--success-text)}.url-container{display:flex;gap:10px;margin:20px 0}.url-container input{flex:1;padding:12px;border:1px solid var(--border-color);border-radius:6px;font-size:14px;background:var(--bg-card);color:var(--text-primary)}.url-container button{padding:12px 20px;background:var(--accent-primary);color:#fff;border:none;border-radius:6px;cursor:pointer;transition:background .2s}.url-container button:hover{background:var(--accent-hover)}.expires{color:var(--text-muted);font-size:14px}.view-page{max-width:500px;margin:0 auto;padding:40px 20px}.view-page h1{text-align:center;margin-bottom:30px;color:var(--text-primary)}.security-warning{background:var(--bg-warning-light);border:1px solid var(--warning-border);border-radius:8px;padding:16px;margin-bottom:20px}.warning-header{display:flex;justify-content:space-between;align-items:center;font-weight:600;color:var(--warning-text);margin-bottom:8px}.dismiss-warning{background:none;border:none;font-size:20px;cursor:pointer;color:var(--warning-text);padding:0;line-height:1}.security-warning p{margin:0 0 8px;color:var(--warning-text-dark);font-size:14px}.security-warning ul{margin:0;padding-left:20px;color:var(--warning-text-dark);font-size:13px}.security-warning li{margin:4px 0}.error-box{background:var(--bg-error-light);border:1px solid var(--error-border);padding:20px;border-radius:8px;text-align:center}.error-box h2{color:var(--error-text);margin-top:0}.error-box p{color:var(--text-secondary)}.decrypt-form p{text-align:center;color:var(--text-muted);margin-bottom:20px}.view-page .password-input input{width:100%;padding:12px 50px 12px 12px;border:1px solid var(--border-color);border-radius:6px;font-size:16px;background:var(--bg-card);color:var(--text-primary)}.decrypt-button,.download-button{width:100%;padding:15px;background:var(--accent-primary);color:#fff;border:none;border-radius:6px;font-size:16px;font-weight:500;cursor:pointer;transition:background .2s}.decrypt-button:hover:not(:disabled),.download-button:hover{background:var(--accent-hover)}.decrypt-button:disabled{background:var(--text-muted);opacity:.6;cursor:not-allowed}.success{text-align:center}.success h2{color:var(--success-text)}.file-details{background:var(--bg-secondary);padding:20px;border-radius:8px;margin:20px 0;text-align:left;border:1px solid var(--border-color)}.file-details p{margin:8px 0;color:var(--text-secondary)}.file-details strong{color:var(--text-primary)}.preview-section{margin:20px 0}.preview-toggle-btn{padding:10px 20px;border:1px solid var(--border-color);border-radius:6px;background:var(--bg-secondary);color:var(--text-primary);font-size:14px;cursor:pointer;transition:background .2s,border-color .2s}.preview-toggle-btn:hover{background:var(--bg-hover);border-color:var(--accent-primary)}.preview-unavailable{font-size:14px;color:var(--text-muted);font-style:italic;margin:0}.preview-container{margin-top:16px;border:1px solid var(--border-color);border-radius:8px;overflow:hidden}.text-preview{margin:0;padding:16px;background:var(--bg-secondary);overflow-x:auto;max-height:400px;overflow-y:auto;font-size:13px;line-height:1.5}.text-preview code{display:block;white-space:pre;color:var(--text-primary)}.image-preview{display:block;max-width:100%;max-height:500px;margin:0 auto;object-fit:contain;background:var(--bg-secondary)}.docs-page{max-width:800px;margin:0 auto;padding:40px 20px}.docs-page h1{text-align:center;font-size:2rem;margin-bottom:10px;color:var(--text-primary, #1a1a2e)}.docs-intro{text-align:center;font-size:1.1rem;color:var(--text-secondary, #666);margin-bottom:40px}.docs-section{margin-bottom:50px}.docs-section h2{font-size:1.5rem;color:var(--text-primary, #1a1a2e);border-bottom:2px solid var(--border-color, #e0e0e0);padding-bottom:10px;margin-bottom:20px}.docs-section p{color:var(--text-secondary, #444);margin-bottom:16px}.process-steps{padding-left:24px;margin:20px 0}.process-steps li{margin-bottom:12px;color:var(--text-secondary, #444)}.process-steps li strong{color:var(--text-primary, #1a1a2e)}.collapsible-section{margin:16px 0;border:1px solid var(--border-color, #e0e0e0);border-radius:8px;overflow:hidden}.collapsible-header{width:100%;display:flex;justify-content:space-between;align-items:center;padding:14px 18px;background:var(--bg-subtle, #f8f9fa);border:none;cursor:pointer;font-size:1rem;font-weight:500;color:var(--text-primary, #333);text-align:left;transition:background .2s}.collapsible-header:hover{background:var(--bg-hover, #eef0f2)}.collapsible-icon{font-size:1.2rem;font-weight:700;color:var(--text-secondary, #666)}.collapsible-content{padding:16px 18px;background:var(--bg-card, #fff);border-top:1px solid var(--border-color, #e0e0e0)}.collapsible-content p{margin:0 0 12px}.collapsible-content p:last-child{margin-bottom:0}.collapsible-content ul{margin:0;padding-left:20px}.collapsible-content li{margin:6px 0;color:var(--text-secondary, #444)}.tech-details{list-style:none;padding:0;margin:0}.tech-details li{padding:8px 0;border-bottom:1px solid var(--border-light, #eee)}.tech-details li:last-child{border-bottom:none}.security-grid,.privacy-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:20px;margin:24px 0}.security-card,.privacy-card{padding:20px;border-radius:10px;border:1px solid var(--border-color, #e0e0e0)}.security-card h3,.privacy-card h3{margin:0 0 12px;font-size:1.1rem}.security-card ul,.privacy-card ul{margin:0;padding-left:20px}.security-card li,.privacy-card li{margin:8px 0;color:var(--text-secondary, #444)}.security-protected{background:var(--bg-success-light, #e8f5e9);border-color:var(--success-border, #a5d6a7)}.security-protected h3{color:var(--success-text, #2e7d32)}.security-threat{background:var(--bg-info-light, #e3f2fd);border-color:var(--info-border, #90caf9)}.security-threat h3{color:var(--info-text, #1565c0)}.cannot-see{background:var(--bg-success-light, #e8f5e9);border-color:var(--success-border, #a5d6a7)}.cannot-see h3{color:var(--success-text, #2e7d32)}.can-see{background:var(--bg-warning-light, #fff8e1);border-color:var(--warning-border, #ffe082)}.can-see h3{color:var(--warning-text, #f57f17)}.warning-box{background:var(--bg-warning-light, #fff8e1);border:1px solid var(--warning-border, #ffe082);border-left:4px solid var(--warning-accent, #ffc107);padding:16px 20px;border-radius:6px;margin:20px 0}.warning-box p{margin:0;color:var(--warning-text-dark, #5d4a0a)}.privacy-note{font-size:.9rem;color:var(--text-muted, #666);font-style:italic}.specs-table{width:100%;border-collapse:collapse}.specs-table td{padding:12px;border-bottom:1px solid var(--border-light, #eee)}.specs-table td:first-child{font-weight:500;color:var(--text-primary, #333);width:40%}.specs-table td:last-child{color:var(--text-secondary, #555);font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.faq-list .collapsible-section{margin-bottom:12px}.faq-list .collapsible-header{font-weight:400}.faq-list .collapsible-content{font-size:.95rem}.flow-diagram{margin:30px 0;padding:20px;background:var(--bg-diagram, #f8fafc);border-radius:12px;overflow:hidden}.encryption-animation{width:100%;max-width:100%;height:auto;display:block;--diagram-bg-local: #f0f9ff;--diagram-bg-cloud: #f0fdf4;--node-fill: #fff;--node-stroke: #2c3e50;--node-process-fill: #e8f4fc;--node-cloud-fill: #dcfce7;--node-link-fill: #fef3c7;--arrow-color: #64748b;--text-color: #1e293b;--text-secondary: #64748b;--note-bg: #fef9c3;--note-border: #facc15}[data-theme=dark] .encryption-animation{--diagram-bg-local: #1e3a5f;--diagram-bg-cloud: #1a3d2e;--node-fill: #2a2a4a;--node-stroke: #4a6fa5;--node-process-fill: #1e3a5f;--node-cloud-fill: #1a3d2e;--node-link-fill: #4a3d1a;--arrow-color: #8888a0;--text-color: #f0f0f5;--text-secondary: #b8b8cc;--note-bg: #4a3d1a;--note-border: #b8942e}.section-label{fill:var(--text-secondary);font-size:14px;font-weight:600;text-transform:uppercase;letter-spacing:.5px}.node{fill:var(--node-fill);stroke:var(--node-stroke);stroke-width:2}.node-process{fill:var(--node-process-fill)}.node-cloud{fill:var(--node-cloud-fill)}.node-link{fill:var(--node-link-fill);stroke:#f59e0b}.node-text{fill:var(--text-color);font-size:14px;font-weight:500}.node-text-small{fill:var(--text-color);font-size:11px;font-family:source-code-pro,Menlo,Monaco,monospace}.node-subtext{fill:var(--text-secondary);font-size:12px}.step-label{fill:var(--text-secondary);font-size:11px}.arrow-line{stroke:var(--arrow-color);stroke-width:2;stroke-dasharray:6 3}.arrow-upload{stroke-width:3;stroke-dasharray:8 4}.arrow-return{stroke-dasharray:4 2;opacity:.7}.arrow-head{fill:var(--arrow-color)}.arrow-label{fill:var(--text-secondary);font-size:11px;font-weight:500}.note-box{fill:var(--note-bg);stroke:var(--note-border);stroke-width:1.5}.note-text{fill:var(--text-color);font-size:12px;font-weight:500}.note-subtext{fill:var(--text-secondary);font-size:10px}@keyframes pulse-step{0%,to{opacity:.6;transform:scale(1)}50%{opacity:1;transform:scale(1.02)}}@keyframes flow-arrow{0%{stroke-dashoffset:20}to{stroke-dashoffset:0}}@keyframes glow{0%,to{filter:drop-shadow(0 0 0 transparent)}50%{filter:drop-shadow(0 0 8px rgba(44,62,80,.4))}}.step{opacity:.5;animation:pulse-step 6s ease-in-out infinite}.step-1{animation-delay:0s}.step-2{animation-delay:1s}.step-3{animation-delay:2s}.step-4{animation-delay:3s}.step-5{animation-delay:4s}.arrow{opacity:.4}.arrow-1{animation:pulse-step 6s ease-in-out infinite;animation-delay:.5s}.arrow-2{animation:pulse-step 6s ease-in-out infinite;animation-delay:1.5s}.arrow-3{animation:pulse-step 6s ease-in-out infinite;animation-delay:2.5s}.arrow-4{animation:pulse-step 6s ease-in-out infinite;animation-delay:3.5s}.arrow-line{animation:flow-arrow 1.5s linear infinite}.security-note{animation:glow 3s ease-in-out infinite}.toast-container{position:fixed;bottom:20px;right:20px;z-index:1000;display:flex;flex-direction:column;gap:10px;max-width:400px}.toast{display:flex;align-items:center;gap:12px;padding:14px 16px;border-radius:8px;box-shadow:0 4px 12px #00000026;animation:slideIn .3s ease-out;color:#fff;font-size:14px}@keyframes slideIn{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}.toast-success{background:#27ae60}.toast-error{background:#e74c3c}.toast-warning{background:#f39c12}.toast-info{background:var(--accent-primary)}[data-theme=dark] 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slideUp{0%{transform:translateY(20px);opacity:0}to{transform:translateY(0);opacity:1}}.onboarding-close{position:absolute;top:12px;right:12px;background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-muted);padding:4px 8px;line-height:1;transition:color .2s}.onboarding-close:hover{color:var(--text-primary)}.onboarding-icon{font-size:64px;margin-bottom:16px;line-height:1}.onboarding-title{font-size:1.5rem;margin:0 0 12px;color:var(--text-primary)}.onboarding-description{font-size:1rem;color:var(--text-secondary);margin:0 0 24px;line-height:1.6}.onboarding-progress{display:flex;justify-content:center;gap:8px;margin-bottom:24px}.onboarding-dot{width:8px;height:8px;border-radius:50%;background:var(--border-color);transition:background .2s,transform .2s}.onboarding-dot.active{background:var(--accent-primary);transform:scale(1.25)}.onboarding-actions{display:flex;gap:12px;justify-content:center}.onboarding-skip{padding:12px 24px;border:1px solid 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