:root{--nav-height:40px;--bg:#f5f5f5;--body-bg:white;--body-color:#333;--border:#ddd;--primary:#4a90d9;--primary-hover:#3a7bc8}:root.dark-mode{--bg:#1a1a1a;--body-bg:#2d2d2d;--body-color:#eee;--border:#444;--primary:#5a9fe9;--primary-hover:#4a8fd9}*{margin:0;padding:0;box-sizing:border-box}.navbar{height:var(--nav-height);border-bottom:1px solid #d3d3d3;z-index:100;background:var(--body-bg);color:var(--body-color);position:relative}.navbar-container{display:flex;align-items:center;height:100%;padding:0 1rem;max-width:100%}.navbar-brand{color:var(--body-color);text-decoration:none;font-weight:700;display:flex;align-items:center;gap:.5rem;font-size:1rem;white-space:nowrap}.navbar-toggler{display:none;background:0 0;border:1px solid var(--body-color);padding:.25rem .5rem;cursor:pointer;margin-left:auto;border-radius:.25rem}.navbar-toggler-icon{display:block;width:1.5em;height:1.5em;background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(0,0,0,0.7)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");background-repeat:no-repeat;background-position:center;background-size:100%}.dark-mode .navbar-toggler-icon{background-image:url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255,255,255,0.9)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e")}.navbar-collapse{display:flex;align-items:center;flex:1;margin-left:1rem}.navbar-nav{display:flex;list-style:none;margin:0;padding:0;gap:.5rem;flex-wrap:wrap}.nav-item{margin:0;position:relative}.nav-link{color:var(--body-color);text-decoration:none;padding:.25rem .75rem;display:block;white-space:nowrap;opacity:.8;transition:opacity .2s}.nav-link:hover{opacity:1}.dark-mode .navbar{border-bottom-color:#a9a9a9}@media(max-width:991px){.navbar-toggler{display:block}.navbar-collapse{display:none;position:absolute;top:var(--nav-height);right:0;background:var(--body-bg);border-bottom:1px solid #d3d3d3;margin:0;padding:1rem}.navbar-collapse.show{display:block}.navbar-nav{gap:0}.nav-link{padding:.5rem 1rem}.dark-mode .navbar-collapse{border-bottom-color:#a9a9a9}}body{font-family:system-ui,-apple-system,sans-serif;background:var(--body-bg);color:var(--body-color);min-height:100vh}#app{max-width:1200px;margin:0 auto;padding:1rem}.header{text-align:center;margin:2em 0}.header h1{font-size:1.5rem;margin-bottom:.25rem}.header p{color:#666;font-size:.9rem}.dark-mode .header p{color:#aaa}.upload-zone{border:2px dashed var(--border);border-radius:8px;padding:3rem 2rem;text-align:center;cursor:pointer;transition:border-color .2s,background .2s;background:var(--bg)}.upload-zone.dragover,.upload-zone:hover{border-color:var(--primary);background:rgba(74,144,217,.05)}.upload-zone input{display:none}.upload-icon{font-size:3rem;margin-bottom:1rem;opacity:.5}.upload-text{font-size:1.1rem;margin-bottom:.5rem}.upload-hint{font-size:.85rem;color:#888}kbd{font-family:inherit;font-size:.85em;padding:.1em .4em;border:1px solid #ccc;border-radius:3px;background:#f7f7f7;box-shadow:0 1px 0 #bbb}.dark-mode kbd{border-color:#555;background:#3a3a3a;box-shadow:0 1px 0 #222}.upload-loading{display:none;font-size:1.1rem;color:var(--primary);margin-top:.5rem}.upload-zone.loading{pointer-events:none;opacity:.6}.upload-zone.loading .upload-hint,.upload-zone.loading .upload-icon,.upload-zone.loading .upload-text{display:none}.upload-zone.loading .upload-loading{display:block}.editor{display:none;padding-top:1rem}.editor.active{display:block}.image-container{background:#000;border-radius:8px;margin-top:1rem;margin-bottom:1rem;position:relative;touch-action:none}.image-container canvas,.image-container img{display:block;max-width:100%;margin:0 auto}.toolbar{display:table;width:100%;table-layout:fixed}.toolbar .toolbar-group{display:table-cell;vertical-align:middle;white-space:nowrap}.toolbar .toolbar-group:nth-child(2){text-align:center}.toolbar .toolbar-group:nth-child(3){text-align:right}@media(max-width:480px){.toolbar{display:flex;flex-wrap:wrap;gap:.5rem;justify-content:center}.toolbar .toolbar-group{display:block}}.dimensions{font-size:.85rem;color:#666}body.editor-active #app{display:flex;flex-direction:column;height:calc(100vh - 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