:root{--color-bg:#f5f6fa;--color-surface:#fff;--color-border:#e4e7ec;--color-text:#101323;--color-text-muted:#667085;--color-text-faint:#98a2b3;--color-primary:#3b82f6;--color-primary-hover:#2563eb;--color-primary-soft:#eff6ff;--color-danger:#dc2626;--color-danger-soft:#fef2f2;--color-success:#16a34a;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--shadow-sm:0 1px 2px #1018280d;--shadow-md:0 2px 8px #1018280f;--shadow-lg:0 8px 24px #1018281a}*{box-sizing:border-box}body{background:var(--color-bg);color:var(--color-text);-webkit-font-smoothing:antialiased;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}h1,h2,h3{letter-spacing:-.01em}h1{margin:4px 0 2px;font-size:24px}h2{margin:0 0 14px;font-size:16px}.app-shell{flex-direction:column;min-height:100vh;display:flex}.navbar{background:var(--color-surface);border-bottom:1px solid var(--color-border);z-index:10;justify-content:space-between;align-items:center;padding:14px 24px;display:flex;position:sticky;top:0}.navbar-brand{color:var(--color-text);align-items:center;gap:10px;font-size:15px;font-weight:700;display:flex}.navbar-logo{background:var(--color-primary-soft);width:30px;height:30px;color:var(--color-primary);border-radius:8px;justify-content:center;align-items:center;display:flex}.app-content{flex:1}.page{max-width:960px;margin:0 auto;padding:32px 24px 64px}.page-header{justify-content:space-between;align-items:center;gap:16px;margin-bottom:28px;display:flex}.page-subtitle{color:var(--color-text-muted);margin:2px 0 0;font-size:13px}.back-link{color:var(--color-text-muted);font-size:13px;font-weight:500;text-decoration:none}.back-link:hover{color:var(--color-primary)}.card-section{background:var(--color-surface);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);border:1px solid var(--color-border);margin-bottom:20px;padding:20px 22px}.auth-page{background:radial-gradient(circle at top left, #eef2ff 0%, var(--color-bg) 45%);justify-content:center;align-items:center;min-height:100vh;display:flex}.auth-form{background:var(--color-surface);border-radius:var(--radius-lg);width:360px;box-shadow:var(--shadow-lg);border:1px solid var(--color-border);flex-direction:column;gap:12px;padding:36px;display:flex}.auth-brand{align-items:center;gap:10px;margin-bottom:6px;font-size:14px;font-weight:700;display:flex}.auth-form h1{margin:0;font-size:22px}.auth-subtitle{color:var(--color-text-muted);margin:0 0 6px;font-size:13px}.auth-footer{color:var(--color-text-muted);text-align:center;margin:4px 0 0;font-size:13px}.auth-form label{color:var(--color-text-muted);flex-direction:column;gap:6px;font-size:13px;font-weight:500;display:flex}.auth-form input{border:1px solid var(--color-border);border-radius:var(--radius-sm);padding:10px 12px;font-size:14px}.auth-form button{margin-top:8px}.error{color:var(--color-danger);background:var(--color-danger-soft);border-radius:var(--radius-sm);padding:8px 12px;font-size:13px}.inline-form{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:16px;display:flex}.inline-form input{border:1px solid var(--color-border);border-radius:var(--radius-sm);flex:1;min-width:160px;padding:10px 12px;font-size:14px}.inline-form label{color:var(--color-text-muted);align-items:center;gap:8px;font-size:14px;display:flex}.export-progress{background:var(--color-primary-soft);border-radius:var(--radius-sm);color:var(--color-text-muted);align-items:center;gap:10px;margin-top:12px;padding:10px 12px;font-size:13px;display:flex}input:focus,button:focus-visible{outline:2px solid var(--color-primary);outline-offset:1px}button{cursor:pointer;font:inherit}.btn{border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);justify-content:center;align-items:center;gap:6px;padding:9px 16px;font-size:14px;font-weight:500;text-decoration:none;transition:background .15s,border-color .15s,transform .1s,opacity .15s;display:inline-flex}.btn:hover{background:#f9fafb}.btn:active{transform:translateY(1px)}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.btn-primary{background:var(--color-primary);border-color:var(--color-primary);color:#fff;box-shadow:0 1px 2px #2563eb40}.btn-primary:hover{background:var(--color-primary-hover);border-color:var(--color-primary-hover)}.btn-ghost{color:var(--color-text-muted);background:0 0;border-color:#0000}.btn-ghost:hover{color:var(--color-text);background:#f2f4f7}.btn-danger-ghost{color:var(--color-danger);background:0 0;border-color:#0000}.btn-danger-ghost:hover{background:var(--color-danger-soft)}.btn-icon{padding:6px 10px;line-height:1}.btn-block{width:100%}.loading-state{color:var(--color-text-muted);justify-content:center;align-items:center;gap:10px;padding:40px 0;font-size:14px;display:flex}.loading-state-full{width:100%;height:100vh}.spinner{border:2px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;flex-shrink:0;width:16px;height:16px;animation:.6s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.empty-state{text-align:center;border:1.5px dashed var(--color-border);border-radius:var(--radius-lg);color:var(--color-text-muted);background:var(--color-surface);padding:48px 24px}.empty-state p{color:var(--color-text);margin:0 0 4px;font-weight:600}.empty-state span{font-size:13px}.empty-state-inline{border-radius:var(--radius-md);padding:16px;font-size:13px}.project-list{grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:14px;margin:0;padding:0;list-style:none;display:grid}.project-card{background:var(--color-surface);border-radius:var(--radius-md);border:1px solid var(--color-border);color:inherit;box-shadow:var(--shadow-sm);flex-direction:column;gap:10px;padding:18px;text-decoration:none;transition:box-shadow .15s,transform .15s,border-color .15s;display:flex}.project-card:hover{box-shadow:var(--shadow-md);border-color:#c7d7fe;transform:translateY(-2px)}.project-card-top{justify-content:space-between;align-items:baseline;gap:8px;display:flex}.project-card-top strong{font-size:15px}.project-card-count{color:var(--color-text-muted);white-space:nowrap;font-size:12px}.project-card-progress-track{background:#eef1f5;border-radius:999px;height:6px;overflow:hidden}.project-card-progress-fill{background:linear-gradient(90deg, var(--color-primary), #60a5fa);border-radius:999px;height:100%}.project-card-meta{color:var(--color-text-faint);font-size:12px}.class-list{flex-direction:column;gap:8px;margin:0 0 16px;padding:0;list-style:none;display:flex}.class-row{background:var(--color-bg);border-radius:var(--radius-sm);border:1px solid var(--color-border);align-items:center;gap:10px;padding:8px 10px;display:flex}.class-row input[type=color]{border:1px solid var(--color-border);background:0 0;border-radius:6px;width:28px;height:28px;padding:0}.class-row input[type=text],.class-row input:not([type=color]){border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);flex:1;padding:7px 10px;font-size:14px}.class-row-actions{gap:4px;display:flex}.dropzone{border-radius:var(--radius-lg);text-align:center;color:var(--color-text-muted);cursor:pointer;box-shadow:var(--shadow-sm);background:linear-gradient(#fff 0%,#fafbff 100%);border:2px dashed #d0d5dd;flex-direction:column;justify-content:center;align-items:center;gap:6px;margin-bottom:20px;padding:40px 24px;transition:border-color .2s,background .2s,transform .15s;display:flex}.dropzone:hover{background:linear-gradient(#fff 0%,#f5f9ff 100%);border-color:#93c5fd;transform:translateY(-1px)}.dropzone-active{border-color:var(--color-primary);background:var(--color-primary-soft);transform:scale(1.01)}.dropzone-busy{cursor:default;border-style:solid;border-color:#93c5fd}.dropzone-icon{color:var(--color-primary);background:var(--color-primary-soft);border-radius:50%;justify-content:center;align-items:center;width:56px;height:56px;margin-bottom:4px;display:flex}.dropzone-title{color:var(--color-text);margin:0;font-size:15px;font-weight:600}.dropzone-subtitle{color:var(--color-text-faint);margin:0;font-size:13px}.upload-panel{background:var(--color-surface);border-radius:var(--radius-md);box-shadow:var(--shadow-md);border:1px solid var(--color-border);margin-bottom:24px;padding:16px 18px;animation:.2s ease-out upload-panel-in}@keyframes upload-panel-in{0%{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}.upload-panel-header{color:#344054;justify-content:space-between;align-items:center;margin-bottom:10px;font-size:13px;font-weight:600;display:flex}.upload-panel-close{width:22px;height:22px;color:var(--color-text-faint);background:0 0;border:none;border-radius:4px;padding:0;font-size:18px;line-height:1}.upload-panel-close:hover{color:#475467;background:#f2f4f7}.upload-progress-track{background:#eef1f5;border-radius:999px;height:6px;margin-bottom:12px;overflow:hidden}.upload-progress-fill{background:linear-gradient(90deg, var(--color-primary), #60a5fa);border-radius:999px;height:100%;transition:width .3s}.upload-progress-fill-error{background:linear-gradient(90deg,#f59e0b,#ef4444)}.upload-file-list{flex-direction:column;gap:2px;max-height:180px;margin:0;padding:0;list-style:none;display:flex;overflow-y:auto}.upload-file-item{color:#475467;border-radius:6px;align-items:center;gap:10px;padding:6px 4px;font-size:13px;display:flex}.upload-file-item:hover{background:#f9fafb}.upload-file-status-icon{width:18px;height:18px;color:var(--color-text-faint);background:#f2f4f7;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:700;display:flex}.upload-file-done .upload-file-status-icon{color:var(--color-success);background:#dcfce7}.upload-file-error .upload-file-status-icon{color:var(--color-danger);background:#fee2e2}.upload-file-uploading .upload-file-status-icon{background:var(--color-primary-soft)}.upload-file-name{text-overflow:ellipsis;white-space:nowrap;flex:1;overflow:hidden}.upload-file-error .upload-file-name{color:var(--color-danger)}.upload-file-error-text{color:var(--color-danger);font-size:11px}.upload-spinner{border:2px solid #bfdbfe;border-top-color:var(--color-primary);border-radius:50%;width:10px;height:10px;animation:.6s linear infinite upload-spin}@keyframes upload-spin{to{transform:rotate(360deg)}}.gallery-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;display:grid}.gallery-item{cursor:pointer;border-radius:var(--radius-md);aspect-ratio:1;box-shadow:var(--shadow-sm);background:#e5e5e5;transition:box-shadow .15s,transform .15s;position:relative;overflow:hidden}.gallery-item:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.gallery-item img{object-fit:cover;width:100%;height:100%;display:block}.badge{color:#fff;border-radius:999px;padding:3px 9px;font-size:11px;font-weight:600;position:absolute;bottom:6px;left:6px;box-shadow:0 1px 3px #0003}.badge-labeled{background:var(--color-success)}.badge-unlabeled{background:#6b7280}.annotate-page{flex-direction:column;height:100vh;display:flex}.annotate-header{background:var(--color-surface);border-bottom:1px solid var(--color-border);align-items:center;gap:16px;padding:12px 20px;display:flex}.annotate-position{color:var(--color-text-muted);font-size:13px}.annotate-header .nav-buttons{gap:8px;margin-left:auto;display:flex}.save-indicator{min-width:80px;font-size:13px;font-weight:500}.save-saving{color:#b45309}.save-saved{color:var(--color-success)}.save-error{color:var(--color-danger)}.annotate-body{flex:1;min-height:0;display:flex}.class-sidebar{background:var(--color-surface);border-right:1px solid var(--color-border);width:230px;padding:18px;overflow-y:auto}.class-sidebar h3{text-transform:uppercase;letter-spacing:.04em;color:var(--color-text-faint);margin:0 0 12px;font-size:13px}.class-chip{border-style:solid;border-width:1.5px;border-color:var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);text-align:left;align-items:center;gap:8px;width:100%;margin-bottom:6px;padding:8px 10px;font-size:13px;transition:background .15s;display:flex}.class-chip:hover{background:#f9fafb}.class-chip-active{background:var(--color-primary-soft)}.chip-swatch{border-radius:3px;flex-shrink:0;width:12px;height:12px;display:inline-block}.hint{color:var(--color-text-muted);margin-top:16px;font-size:12px;line-height:1.5}.canvas-container{background:#1c1c26;flex:1}