.masking-container{max-width:1e3px}.image-input-area{border:2px dashed var(--border-strong);background-color:#fafbfc;border-radius:var(--radius);padding:var(--space-xl);text-align:center;color:var(--text-muted);cursor:pointer;position:relative;min-height:180px;display:flex;flex-direction:column;align-items:center;justify-content:center}.image-input-area:hover,.image-input-area.drag-over{border-color:var(--primary);background-color:var(--primary-light)}.image-input-area.has-image{border-style:solid;border-color:var(--border-color);background:var(--panel-bg);cursor:default;padding:var(--space-sm)}.image-input-area input[type=file]{display:none}.image-input-area .drop-label{font-size:var(--font-size-base)}.image-input-area .drop-hint{font-size:var(--font-size-sm);margin-top:var(--space-xs);color:var(--text-light)}.image-input-area img{max-width:100%;max-height:300px;border-radius:var(--radius);display:block}.image-input-area .image-info{font-size:var(--font-size-xs);color:var(--text-muted);margin-top:var(--space-xs)}.image-input-area .image-actions{position:absolute;top:var(--space-xs);right:var(--space-xs);display:flex;gap:var(--space-xs)}.image-input-area .image-actions button{padding:4px 8px;font-size:var(--font-size-xs)}.encode-images{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-lg);margin-bottom:var(--space-lg)}.encode-image-col h3{margin-bottom:var(--space-sm);font-size:var(--font-size-base)}.encode-image-col .col-desc{font-size:var(--font-size-xs);color:var(--text-muted);margin-bottom:var(--space-sm)}.result-area{margin-top:var(--space-lg)}.result-area .result-image-container{background:var(--panel-bg);border:1px solid var(--border-color);border-radius:var(--radius);padding:var(--space-sm);text-align:center;min-height:120px;display:flex;flex-direction:column;align-items:center;justify-content:center}.result-area .result-image-container img{max-width:100%;max-height:450px;border-radius:var(--radius)}.result-area .result-image-container .placeholder-text{color:var(--text-light);font-size:var(--font-size-sm)}.result-actions{display:flex;gap:var(--space-sm);margin-top:var(--space-sm);justify-content:center;flex-wrap:wrap}.settings-row{display:flex;gap:var(--space-lg);flex-wrap:wrap;align-items:flex-end}.settings-row .form-group{flex:none;min-width:140px}.settings-row .form-group label{white-space:nowrap}.settings-row .form-group.check-group{min-width:auto}.processing-indicator{display:none;align-items:center;gap:var(--space-sm);color:var(--text-muted);font-size:var(--font-size-sm);margin-top:var(--space-sm)}.processing-indicator.active{display:flex;justify-content:center}.spinner{width:16px;height:16px;border:2px solid var(--border-color);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.decode-input-row{margin-bottom:var(--space-lg)}.decode-input-row .image-input-area{max-width:600px;margin:0 auto}.help-text{background:var(--primary-light);border:1px solid #bee3f8;border-radius:var(--radius);padding:var(--space-sm)var(--space-md);font-size:var(--font-size-sm);color:#2a4365;margin-bottom:var(--space-lg);line-height:1.5}.contrast-reset{font-size:var(--font-size-xs);color:var(--primary);cursor:pointer;margin-left:var(--space-xs)}.contrast-reset:hover{text-decoration:underline}.help-icon{display:inline-block;width:14px;height:14px;line-height:14px;text-align:center;border-radius:50%;background:var(--border-color);color:var(--text-muted);font-size:10px;font-weight:700;cursor:help;margin-left:4px}.help-icon:hover{background:var(--primary);color:#fff}@media(max-width:640px){.encode-images{grid-template-columns:1fr}.settings-row{flex-direction:column;gap:var(--space-sm)}.settings-row .form-group{width:100%}}.masking-doc-overlay{display:none;position:fixed;inset:0;z-index:1000;background:rgba(0,0,0,.5);justify-content:center;align-items:flex-start;padding:40px 16px;overflow-y:auto}.masking-doc-overlay.active{display:flex}.masking-doc-modal{background:#fff;border-radius:var(--radius);max-width:780px;width:100%;box-shadow:0 8px 32px rgba(0,0,0,.2);animation:docFadeIn .2s ease}@keyframes docFadeIn{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}.masking-doc-header{display:flex;align-items:center;justify-content:space-between;padding:var(--space-md)var(--space-lg);border-bottom:1px solid var(--border-color)}.masking-doc-header h2{margin:0;font-size:18px}.masking-doc-close{background:0 0;border:none;font-size:24px;cursor:pointer;color:var(--text-muted);padding:4px 8px;line-height:1}.masking-doc-close:hover{color:var(--text-main)}.masking-doc-body{padding:var(--space-lg);line-height:1.7;font-size:14px;color:var(--text-main)}.masking-doc-body h3{margin-top:var(--space-lg);margin-bottom:var(--space-sm);font-size:16px;color:var(--text-heading,#1a202c)}.masking-doc-body h3:first-child{margin-top:0}.masking-doc-body h4{margin-top:var(--space-md);margin-bottom:var(--space-xs);font-size:14px;font-weight:600}.masking-doc-body p,.masking-doc-body ul,.masking-doc-body ol{margin-bottom:var(--space-sm)}.masking-doc-body ul,.masking-doc-body ol{padding-left:1.5em}.masking-doc-body li{margin-bottom:4px}.masking-doc-body code{background:#f0f4f8;padding:1px 5px;border-radius:3px;font-size:13px}.masking-doc-body a{color:var(--primary)}.masking-doc-body hr{border:none;border-top:1px solid var(--border-color);margin:var(--space-lg)0}.doc-code{background:#f0f4f8;border:1px solid var(--border-color);border-radius:var(--radius);padding:8px 12px;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:13px;overflow-x:auto}.doc-formula{background:#f8f9fb;border-left:3px solid var(--primary);padding:10px 14px;margin:var(--space-sm)0;font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,monospace;font-size:13px;line-height:1.6;overflow-x:auto}.doc-aside{background:#f0f7ff;border:1px solid #bee3f8;border-radius:var(--radius);padding:var(--space-sm)var(--space-md);margin:var(--space-md)0;font-size:13px;line-height:1.6;color:#2a4365}.doc-aside strong{color:#1a365d}.doc-figure{margin:var(--space-md)0;text-align:center}.doc-figure img{max-width:100%;border-radius:var(--radius);border:1px solid var(--border-color)}.doc-figure figcaption{font-size:12px;color:var(--text-muted);margin-top:var(--space-xs)}