:root{--primary-color: #1976d2;--primary-dark: #1565c0;--secondary-color: #ff9800;--danger-color: #f44336;--success-color: #4caf50;--background-color: #f5f5f5;--card-background: #ffffff;--text-primary: #212121;--text-secondary: #757575;--border-color: #e0e0e0}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background-color:var(--background-color);color:var(--text-primary);line-height:1.5}.app{min-height:100vh;display:flex;flex-direction:column}.header{background-color:var(--primary-color);color:#fff;padding:16px 20px;text-align:center;box-shadow:0 2px 4px #0000001a}.header h1{font-size:20px;font-weight:500}.main-content{flex:1;padding:16px 16px 80px}.tab-bar{position:fixed;bottom:0;left:0;right:0;background-color:#fff;display:flex;box-shadow:0 -2px 8px #0000001a;z-index:100}.tab-item{flex:1;padding:12px 8px;text-align:center;cursor:pointer;color:var(--text-secondary);font-size:12px;transition:all .2s;border:none;background:none}.tab-item.active{color:var(--primary-color)}.tab-item svg{display:block;margin:0 auto 4px;width:24px;height:24px}.card{background-color:var(--card-background);border-radius:8px;padding:16px;margin-bottom:16px;box-shadow:0 1px 3px #00000014}.card-title{font-size:16px;font-weight:500;color:var(--text-primary);margin-bottom:12px}.form-group{margin-bottom:16px}.form-label{display:block;font-size:14px;color:var(--text-secondary);margin-bottom:6px}.form-input{width:100%;padding:12px;border:1px solid var(--border-color);border-radius:6px;font-size:16px;transition:border-color .2s}.form-input:focus{outline:none;border-color:var(--primary-color)}.checkbox-group{display:flex;align-items:center;padding:10px 0;border-bottom:1px solid var(--border-color)}.checkbox-group:last-child{border-bottom:none}.checkbox-input{width:20px;height:20px;margin-right:12px;accent-color:var(--primary-color)}.checkbox-label{flex:1;font-size:15px}.btn{display:block;width:100%;padding:14px;border:none;border-radius:8px;font-size:16px;font-weight:500;cursor:pointer;transition:all .2s}.btn-primary{background-color:var(--primary-color);color:#fff}.btn-primary:hover{background-color:var(--primary-dark)}.btn-primary:disabled{background-color:#bdbdbd;cursor:not-allowed}.btn-danger{background-color:var(--danger-color);color:#fff}.section-title{font-size:18px;font-weight:500;color:var(--primary-color);margin:20px 0 12px;padding-bottom:8px;border-bottom:2px solid var(--primary-color)}.lab-card{background-color:#fff;border-radius:8px;padding:16px;margin-bottom:12px;box-shadow:0 1px 3px #00000014}.lab-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.lab-title{font-size:16px;font-weight:500;color:var(--text-primary)}.lab-info{font-size:14px;color:var(--text-secondary);margin-bottom:8px}.lab-hazards{margin-top:8px}.hazard-tag{display:inline-block;background-color:#fff3e0;color:#e65100;padding:4px 10px;border-radius:4px;font-size:13px;margin:4px 4px 4px 0}.delete-btn{background:none;border:none;color:var(--danger-color);cursor:pointer;padding:4px 8px;font-size:14px}.empty-state{text-align:center;padding:40px 20px;color:var(--text-secondary)}.empty-state svg{width:64px;height:64px;margin-bottom:16px;opacity:.5}.generate-section{text-align:center;padding:40px 20px}.generate-btn{max-width:280px;margin:0 auto}.success-message{background-color:#e8f5e9;color:#2e7d32;padding:16px;border-radius:8px;margin-top:16px;text-align:center}.other-input{margin-top:8px;padding-left:32px}.alert{background-color:#fff3e0;border-left:4px solid var(--secondary-color);padding:12px 16px;border-radius:4px;margin-bottom:16px;font-size:14px;color:#e65100}