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24px;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.loading-content h2{margin:0 0 12px;font-size:20px;font-weight:600;color:var(--text-main)}.loading-content p{margin:0;font-size:14px;color:var(--text-muted)}.url-input{width:400px;padding:8px 14px;border:1px solid rgba(255,255,255,.1);border-radius:var(--radius-sm);font-size:13px;background:#ffffff0d;color:#fff;transition:all .2s}.url-input:focus{outline:none;background:#ffffff1a;border-color:var(--primary-color);box-shadow:0 0 0 2px #2563eb4d}.upload-btn,.export-btn,.logout-btn,.undo-btn,.redo-btn{padding:8px 18px;border:none;border-radius:var(--radius-sm);font-size:13px;font-weight:600;cursor:pointer;transition:all .2s cubic-bezier(.4,0,.2,1)}.upload-btn{background:var(--primary-color);color:#fff}.upload-btn:hover:not(:disabled){background:var(--primary-hover);transform:translateY(-1px)}.upload-btn:disabled{background:#475569;cursor:not-allowed;opacity:.7}.export-btn{background:var(--success-color);color:#fff}.export-btn:hover{background:#059669;transform:translateY(-1px)}.undo-btn,.redo-btn{background:#ffffff1a;color:#fff;border:1px solid rgba(255,255,255,.2)}.undo-btn:hover:not(:disabled),.redo-btn:hover:not(:disabled){background:#ffffff26;border-color:#ffffff4d;transform:translateY(-1px)}.undo-btn:disabled,.redo-btn:disabled{opacity:.4;cursor:not-allowed;background:#ffffff0d}.app-main{flex:1;display:flex;overflow:hidden;padding:12px;gap:12px}.empty-state{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;background:var(--bg-panel);border-radius:var(--radius-lg);border:2px dashed var(--border-light);margin:24px}.empty-state p{font-size:16px;color:var(--text-muted)}.toast{position:fixed;bottom:24px;right:24px;padding:16px 24px;background:#fff;border-radius:8px;box-shadow:0 4px 12px #00000026;font-size:14px;font-weight:500;z-index:1000;animation:slideInRight .3s ease-out;display:flex;align-items:center;gap:8px;min-width:300px;max-width:500px}.toast-success{border-left:4px solid var(--success-color);color:var(--success-color)}.toast-error{border-left:4px solid var(--error-color);color:var(--error-color)}.toast-info{border-left:4px solid var(--primary-color);color:var(--primary-color)}@keyframes slideInRight{0%{transform:translate(100%);opacity:0}to{transform:translate(0);opacity:1}}:root{--primary-color: #2563eb;--primary-hover: #1d4ed8;--bg-app: #f9fafb;--bg-panel: #ffffff;--text-main: #111827;--text-muted: #6b7280;--border-light: #e5e7eb;--border-focus: #3b82f6;--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, .1), 0 2px 4px -1px rgba(0, 0, 0, .06);--accent-color: #f59e0b;--success-color: #10b981;--danger-color: #ef4444;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background-color:var(--bg-app);color:var(--text-main);overflow:hidden}#root{width:100vw;height:100vh}